Catastrophe mars 2011 Japon : communiqués de presse de TEPCO

Tous les communiqués de presse sont accessibles ici :
http://www.tepco.co.jp/en/press/corp-com/release/index-e.html
Il y en a probablement des plus récents (toutes les heures)

sommaire

Plant Status of Fukushima Daini Nuclear Power Station (as of 13:00 am March 15th)

Plant Status of Fukushima Daini Nuclear Power Station (as of 12:00 am March 15th)

Plant Status of Fukushima Daini Nuclear Power Station (as of 11:00 am March 15th)

Press Release (Mar 15,2011) Damage to the Unit 4 Nuclear Reactor Building at Fukushima Dai-ichi Nuclear Power Station

Press Release (Mar 15,2011)
_Damage to the Unit 4 Nuclear Reactor Building at Fukushima Dai-ichi Nuclear Power Station

At approximately 6:00am, a loud explosion was heard from within the
power station. Afterwards, it was confirmed that the 4th floor rooftop
area of the Unit 4 Nuclear Reactor Building had sustained damage.

After usage, fuel is stored in a pool designated for spent fuel.

Plant conditions as well as potential outside radiation effects are
currently under investigation.

TEPCO, along with other involved organizations, is doing its best to
contain the situation. Simultaneously, the surrounding environment is
being kept under constant surveillance.

Plant Status of Fukushima Daini Nuclear Power Station (as of 10:00 am March 15th)

Press Release (Mar 15,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 8:00 am March 15th)

Press Release (Mar 15,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 7:15 am Mar 15th)

Press Release (Mar 15,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 7:15 am Mar 15th)

At 7:15am, Mar 15th, Unit 4 achieved reactor cold shutdown. Accordingly,
all the units in Fukushima Daini Nuclear Power Station have achieved
reactor cold shutdown.

Unit 1 (shut down at 2:48pm on Mar 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, Mar 12th, there was an alarm indicating that one of the
control rods was not properly inserted, however, at 10:43am, Mar 12th
the alarm was spontaneously called off. Other control rods has been
confirmed that they are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the
containment vessel at this moment.
 At 5:22am, Mar 12th, the temperature of the suppression chamber
exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 5:22am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am, Mar 12th and finished at 6:30pm, Mar 12th.
 Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 1:24 am, Mar 14th.
 At 10:15am, Mar 14th, it has been confirmed that the average water
temperature of the suppression chamber has continuously fell bellow 100
degrees.
 At present, the unit has achieved reactor cold shutdown.

Unit 2 (shut down at 2:48pm on Mar 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the
containment vessel.
 At 5:32am, Mar 12th, the temperature of the suppression chamber
exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 5:32am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am, Mar 12th and finished at 10:58pm, Mar
12th.
 Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 7:13 am, Mar 14th.
 At 3:52pm, Mar 14th, it has been confirmed that the average water
temperature of the suppression chamber has continuously fell bellow 100
degrees.
 At present, the unit has achieved reactor cold shutdown.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the
containment vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm, Mar 12th and finished at 12:13pm, Mar
12th.
 At present, the unit has achieved reactor cold shutdown.

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 0:43pm, Mar 13th, there was a signal indicating that one of the
control rods may have not properly inserted. However, we confirmed that
it was inserted completely by another signal. We will inspect the reason
of this.
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the
containment vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 6:07am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am, Mar 12th and finished at around 11:52am,
Mar 12th.
 Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 3:42 pm, Mar 14th.
 At 7:15pm, Mar 15th, it has been confirmed that the average water
temperature of the suppression chamber has continuously fell bellow 100
degrees.
 At present, the unit has achieved reactor cold shutdown.
 At approximately 11:01am, Mar 14th, an explosion followed by white
smoke occurred at the reactor building of Unit 3. It was believed to be
a hydrogen explosion.
 There was an increase of radiation dose at site boundary measured at
the monitoring post of Fukushima Daini Nuclear Power Station.
Accordingly, at 10:07pm Mar 14th and at 12:35am Mar 15th, it was
determined that that a specific incident stipulated in article 10,
clause 1 (Increase of radiation dose at site boundary) has occurred.
 We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

Press Release (Mar 14,2011) Implementation plan of rolling blackout on and after Tue, March 15, 2011

Press Release (Mar 14,2011)
Implementation plan of rolling blackout on and after Tue, March 15, 2011

Due to the Tohoku-Chihou-Taiheiyo-Oki Earthquake occurred on March 11,
the power supply-demand balance within our service area has been very
critical. As such, we have decided to implement rolling blackout on
and after March 15, which was started on March 14. We sincerely regret
to cause the anxiety and inconvenience to our customers and the society.
We will continuously make every effort to restore stable power supply
as soon as possible.

 Implementation plan of rolling blackout on Tue, March 15
Regional block and time periods planned to have rolling blackout are as
follows. The actual extension of blackout for each block are planned to
be approximately 3 hours each.
For customers who will be subject to rolling blackout, please be prepared
for the announced blackout periods. Also for customers who are not
subject to blackouts, TEPCO appreciates your continuous cooperation in
reducing electricity usage by avoiding using unnecessary lighting and
electrical equipment.

[Expected rolling blackout regions]
Block 3 : 6:20 - 10:00
Block 4 : 9:20 - 13:00
Block 5 : 12:20 - 16:00
Block 1 : 15:20 - 19:00
Block 2 : 18:20 - 22:00

 Please refer to the attachment1 for the detailed region of the blocks.
 Starting and ending time of blackout periods may slightly differ.
 Depending on supply and demand conditions on the actual days,
planned blackouts may not been carried out or may be implemented at
times which were not previously announced.
 The website of TEPCO provides information including "Chome".
http://www.tepco.co.jp/index-j.html

 Implementation plan of rolling blackout from Wed, March 16 to Fri, March 18
Please refer to the attachment2 for the detailed plan.

 Please refer to the attachment1 for the detailed region of the blocks.
 The rolling blackout is scheduled in the same order every day, but
time of blackout periods may be subject to change.
 Starting and ending time of blackout periods may slightly differ.
 Depending on supply and demand conditions on the actual days,
planned blackouts may not been carried out or may be implemented at times which
were not previously announced.

Press Release (Mar 14,2011) White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3 (3rd release)

Press Release (Mar 14,2011)
White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3 (3rd release)

At approximately 11:01am, an explosion followed by white smoke occurred
at the reactor building of Unit 3. It was believed to be a hydrogen
explosion.

According to the parameter, it is believed that the reactor containment
vessel remains intact. However, the status of the plant and the impact
of radioactive materials to the outside environment are presently under
investigation. (previously announced)

As of 1:30 pm, 4 TEPCO employees and 3 workers from other companies have
sustained injuries (all of them are conscious). 3 ambulances are in
operation to care for them and 2 have already dispatched the casualties
to the hospital.

As of 0:30 pm, the measured value of radiation dose near MP6 was 4μSv/h.
The increase of the radiation dose cannot be confirmed at this time.

As of 0:30 pm, the measured value of radiation dose at the monitoring
post in Fukushima Daini Power Station located approximately 10 km south
of Fukushima Daiichi Power Station remains at the same level.

In light of the incidents that have occurred at Units 1 and 3, we are
considering applying prevention measures to the wall of the reactor
building to ventilate the hydrogen gas contained in Unit 2.

TEPCO continues to take all measures to restore the safety and security
of the site and are monitoring the site’s immediate surroundings.

Press Release (Mar 14,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 8:00 am March 14th)

Press Release (Mar 14,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 8:00 am March 14th)

[New Items are underlined]

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, Mar 12th, there was an alarm indicating that one of the
control rods was not properly inserted, however, at 10:43am, Mar 12th
the alarm was spontaneously called off. Other control rods has been
confirmed that they are fully inserted (reactor is in subcritical
status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost, at
5:22am, Mar 12th, it was determined that a specific incident stipulated
in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am, Mar 12th and finished at 6:30pm, Mar 12th.
 Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 1:24 am, Mar 14th.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 At 5:32am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:32am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am, Mar 12th and finished at 10:58pm, Mar
12th.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.
 Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 7:13 am, Mar 14th.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm, Mar 12th and finished at 12:13pm, Mar
12th.
 Reactor cold shutdown at 12:15pm, Mar 12th

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 0:43PM, there was a signal indicating that one of the control rods
may have not properly inserted. However, we confirmed that it was
inserted completely by another signal. We will inspect the reason of
this.
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost, at
6:07am, Mar 12th, it was determined that a specific incident stipulated
in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am, Mar 12th and finished at around 11:52am,
Mar 12th.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We
will continue to monitor in detail the possibility of radioactive material
being discharged from exhaust stack or discharge canal.

Press Release (Mar 14,2011) Occurrence of a Specific Incident (Failure of reactor cooling function) Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness

Press Release (Mar 14,2011)
Occurrence of a Specific Incident (Failure of reactor cooling function) Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness

At 2:46PM on March 11th 2011, the turbines and reactors of Fukushima
Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output
460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784
Megawatts) that had been operating at rated power automatically shutdown
due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake.
(previously announced)

In response, water injection into Unit 2’s reactor were being carried out
by the Reactor Core Isolation Cooling System. However, as the Reactor Core
Isolation Cooling System failed today, it was determined that a specific
incident (failure of reactor cooling function) stipulated in article 15,
clause 1 has occurred at 1:25 pm today.

Press Release (Mar 14,2011) White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3 (2nd release)

Press Release (Mar 14,2011)
White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3 (2nd release)

At approximately 11:01am, an explosive sound followed by white smoke
occurred at the reactor building of the Unit 3. It was believed to be a
hydrogen explosion.

According to the parameter, it is estimated that the reactor containment
vessel remains intact. However, the status of the plant and the impact of
radioactive materials to the outside environment are presently under
investigation. (previously announced)

As of 12:00 am, 4 TEPCO employees and 2 workers of related companies have
sustained injuries (all of them are conscious) and ambulances are on
their way to care for them.

As of 11:44 am, the measured value of radiation dose near MP6 is 20μSv/h
and the radiation level remains stable.

TEPCO continues to take all measures to restore the safety and security
of the site and are monitoring the site’s immediate surroundings.

Press Release (Mar 14,2011) White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3

Press Release (Mar 14,2011)
White smoke around the Fukushima Daiichi Nuclear Power Station Unit 3

At approximately 11:01am, an explosive sound followed by white smoke
occurred at the reactor building of the Unit 3. It was believed to be a
hydrogen explosion.

According to the parameter, it is estimated that the reactor containment
vessel remains intact. However, the status of the plant and the impact
of radioactive materials to the outside environment are presently under
investigation.

Some workers have sustained injuries. Ambulances are on their way to care
for them.

TEPCO continues to take all measures to restore the safety and security of
the site and are monitoring the site’s immediate surroundings.

Press Release (Mar 13,2011) Implementation of rolling blackout and request for further energy saving

Press Release (Mar 13,2011)
Implementation of rolling blackout and request for further energy saving

Due to the Tohoku-Chihou-Taiheiyo-Oki Earthquake occurred on March 11,
our power supply facilities including Fukushima Daiichi Nuclear Power
Station, Fukushima Daini Nuclear Power Station, and our transmission
facilities are severely damaged. As such, the power supply-demand
balance within our service area has been getting very critical.

We have been taking all measures to ensure the stable power supply
including receiving electricity from other utilities through frequency
converting station. Also, the national government has been asking
people and industry to cooperate in energy savings.

However, considering the critical balance of our power supply capacity
and expected power demand forward, in order to avoid unexpected blackout,
TEPCO has decided to implement rolling blackout (planned blackout
alternates from one area to another). We sincerely regret to cause the
anxiety and inconvenience to our customers and the society despite our
endeavor to avoid blackout. We will make every effort to restore stable
power supply as soon as possible.

On March 14th (Monday)
Regional block and time periods planned to have rolling blackout are as
follows (and as per attached). The actual extension of blackout for each
block are planned to be approximately 3 hours each.
For customers who will be subject to rolling blackout, please be prepared
for the announced blackout periods. Also for customers who are not subject
to blackouts, TEPCO appreciates your continuous cooperation in reducing
electricity usage by avoiding using unnecessary lighting and electrical
equipment.

[Expected rolling blackout regions]
Block 1 : 6:20 - 10:00 (Approximately 3 hours within the period)
Block 2 : 9:20 - 13:00 (Approximately 3 hours within the period)
Block 3:12:20 - 16:00 (Approximately 3 hours within the period)
Block 4:13:50 - 17:30 (Approximately 3 hours within the period)
Block 5:15:20 - 19:00 (Approximately 3 hours within the period)
Block 1:16:50 - 20:30 (Approximately 3 hours within the period)
Block 2:18:20 - 22:00 (Approximately 3 hours within the period)

 Please refer to the attached for the detailed region of the blocks.
 Starting and ending time of blackout periods may slightly differ.
 Depending on supply and demand conditions on the actual days,
blackouts may occur at times which were not previously announced.

[Others]
 Please DO NOT touch cut-off Electric wire.
 In order to prevent fire, please make sure to switch off the
electric appliances such as hair drier and to shut down the breaker
of distribution board when you leave your house.
 For the customer who has in-house power generation, please secure
fuel for generator.

[Reference : Status of demand and Supply]
 Expected Demand and Supply on 13th March(Sun)
Estimated Demand : 37,000MW (18:00-19:00)
Supply capacity : 37,000MW

 Expected Demand and Supply on 14th March(Mon)
Estimated Demand : 41,000MW (18:00-19:00)
Supply capacity : 31,000MW

Press Release (Mar 13,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 9pm March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 9pm March 13th)

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

[There is no update from the previous press release.]

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due
to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 We have been injecting sea water and boric acid which absorbs neutron
into the reactor pressure vessel.

Unit 2(Shut down)
 Reactor has been shut down and Reactor Core Isolation Cooling System
has been injecting water to the reactor. Current reactor water level is
lower than normal level, but the water level is steady. After fully
securing safety, measures to lowering the pressure of reactor
containment vessel has been taken, under the instruction of
the national government.

Unit 3(Shut down)
 Reactor has been shut down. However, as High Pressure Core Injection
System has been automatically shut down and water injection to
the reactor was interrupted, following the instruction by
the government and with fully securing safety, steps to lowering
the pressure of reactor containment vessel has been taken. Spraying
in order to lower pressure level within the reactor containment vessel
has been cancelled.
 After that, safety relief valve has been opened manually, lowering
the pressure level of the reactor, which was immediately followed
by injection of boric acid water which absorbs neutron, into
the reactor pressure vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant
to ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Casualty
 2 workers of cooperative firm were injured at the occurrence of
the earthquake, and were transported to the hospital.
 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
 The radiation exposure of 1 TEPCO employee, who was working inside
the reactor building, exceeded 100mSv and was transported to
the hospital.
 2 TEPCO employees felt bad during their operation in the central
control rooms of Unit 1 and 2 while wearing full masks, and were
transferred to Fukushima Daini Power Station for consultation with
a medical advisor.
 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
 Presence of 2 TEPCO employees at the site are not confirmed

Others
 We are currently coordinating with the relevant authorities and
departments as to how to secure the cooling water to cool down
the water in the spent nuclear fuel pool.
 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive
materials level is higher than ordinary level. Also, the level
at monitoring post is higher than ordinary level. We will continue
to monitor in detail the possibility of radioactive material being
discharged from exhaust stack or discharge canal. The national
government has instructed evacuation for those local residents within
20km radius of the periphery because it’s possible that radioactive
materials are discharged.

 We will continue to take all measures to restore the security of the
site and to monitor the environment of the site periphery.

Press Release (Mar 13,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 8pm March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 8pm March 13th)

[There is no update from the press release issued at 7:00 pm]

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, Mar 12th, there was an alarm indicating that one of
the control rods was not properly inserted, however, at 10:43am,
Mar 12th the alarm was spontaneously called off. Other control rods has
been confirmed that they are fully inserted (reactor is in subcritical
status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel at this moment.
 At 5:22am, Mar 12th, the temperature of the suppression chamber
exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 5:22am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety.
This preparation work started at around 9:43am, Mar 12th and finished
at 6:30pm, Mar 12th.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 At 5:32am, Mar 12th, the temperature of the suppression chamber
exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 5:32am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety.
This preparation work started at around 10:33am, Mar 12th and finished
at 10:58pm, Mar 12th.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm, Mar 12th and finished at 12:13pm,
Mar 12th.
 Reactor cold shutdown at 12:15pm, Mar 12th

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 0:43PM, there was a signal indicating that one of the control rods
may have not properly inserted. However, we confirmed that it was
inserted completely by another signal. We will inspect the reason
of this.
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, Mar 12th, the temperature of the suppression chamber
exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 6:07am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am, Mar 12th and finished
at around 11:52am, Mar 12th.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Indication from monitoring posts installed at the site boundary did
not show any difference from ordinary level.
No radiation impact to the external environment has been confirmed.
We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

Press Release (Mar 13,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3:00PM)

Press Release (Mar 13,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3:00PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 20km radius of the site periphery.
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside).
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM, Mar 12 and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM, Mar 12. The radiation dose at the monitoring post decreased once. Today, the measured value revamped and the radiation dose measured at site boundary exceeded the limiting value again. As such, at 8:56AM, today, it was determined that a specific incident stipulated in article 15, clause 1 occurred and at 09:01AM, today, notified accordingly.
  After that, the measured value by the monitoring car decreased once, however the value revamped and the radiation dose measured at site boundary exceeded the limitation again. As such, at 2:15PM, today, it was determined that a specific incident stipulated in article 15, clause 1 occurred and at 02:23PM, today, notified accordingly.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM, Mar 12th.
• Unit 1 : We started injection of sea water into the reactor core at 8:20PM, Mar 12 and then boric acid subsequently. We are coordinating with the relevant authorities and departments as to how to cool down water in the spent nuclear fuel pool.
• Unit 2 : Reactor has been shut down and Reactor Core Isolation Cooling System has been injecting water to the reactor. Current reactor water level is lower than normal level, but the water level is steady. After fully securing safety, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels under the instruction of the national government. To do so, we operated the vent valve and completed the operation at 11:00AM, Mar 13.
• Unit 3 : High Pressure Coolant Injection System automatically stopped. We endeavored to restart the Reactor Core Isolation Cooling System but failed. Also, we could not confirm the water inflow of Emergency Core Cooling System. As such, we decided at 5.10AM, Mar 12, and we reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5:58AM, Mar 13. In order to fully secure safety, we operated the vent valve to reduce the pressure of the reactor containment vessels (partial release of air containing radioactive materials) and completed the procedure at 8:41AM, Mar 13 (successfully completed at 09:20AM, Mar 13. After that, we began injecting water containing boric acid that absorbs neutron into the reactor by the fire pump from 09:25AM, Mar 13.
  Taking account of the situation that the water level within the pressure vessel did not rise for a long time and the radiation dose is increasing, we cannot exclude the possibility that the same situation occurred at Unit 1 on Mar 12 will occur. We are considering the countermeasure to prevent that.
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.
• The operator trapped in the crane operating console of the exhaust stack was transferred to the ground at 5:13PM and confirmed the death at 5:17PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Unit 2 : shutdown due to earthquake (Unit 3
resumed operation)
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]

• All the stations have been restored.

[Transmission System, etc.]
4 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.26 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 7,366
Chiba Pref. : 301
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 247,853
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW
Backup supply from Kitahon Interconnection Facility : 600MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 13,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 2pm March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 2pm March 13th)

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due
to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 We have been injecting sea water and boric acid which absorbs neutron
into the reactor pressure vessel.

Unit 2(Shut down)
 Reactor has been shut down and Reactor Core Isolation Cooling System
has been injecting water to the reactor. Current reactor water level
is lower than normal level, but the water level is steady. After fully
securing safety, measures to lowering the pressure of reactor
containment vessel has been taken, under the instruction of the
national government.

Unit 3(Shut down)
 Reactor has been shut down. However, as High Pressure Core Injection
System has been automatically shut down and water injection to the
reactor was interrupted, following the instruction by the government
and with fully securing safety, steps to lowering the pressure of
reactor containment vessel has been taken. Spraying in order to lower
pressure level within the reactor containment vessel has been cancelled.
 After that, safety relief valve has been opened manually, lowering the
pressure level of the reactor, which was immediately followed by
injection of boric acid water which absorbs neutron, into the reactor
pressure vessel.
 After that, following decrease of the water level and increase of the
pressure level in the reactor, injection of sea water is being
attempted.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Casualty
 2 workers of cooperative firm were injured at the occurrence of the
earthquake, and were transported to the hospital.
 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
 The radiation exposure of 1 TEPCO employee, who was working inside the
reactor building, exceeded 100mSv and was transported to the hospital.
 2 TEPCO employees felt bad during their operation in the central
control rooms of Unit 1 and 2 while wearing full masks, and were
transferred to Fukushima Daini Power Station for consultation with a
medical advisor.
 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
 Presence of 2 TEPCO employees at the site are not confirmed

Others
 We are currently coordinating with the relevant authorities and
departments as to how to cool down the water in the spent nuclear fuel
pool.
 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive
materials level is higher than ordinary level. Also, the level at
monitoring post is higher than ordinary level. We will continue to
monitor in detail the possibility of radioactive material being
discharged from exhaust stack or discharge canal. The national
government has instructed evacuation for those local residents within
20km radius of the periphery because it¡Çs possible that radioactive
materials are discharged.
 We will continue to take all measures to restore the security of the
site and to monitor the environment of the site periphery.

Press Release (Mar 13,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 1:00PM)

Press Release (Mar 13,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 1:00PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 20km radius of the site periphery.
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside).
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM, Mar 12 and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM, Mar 12. After that, the radiation dose at the monitoring post decreased once. Today, the measured value revamped and the radiation dose measured at site boundary exceeded the limiting value again. As such, at 8:56AM, today, it was determined that a specific incident stipulated in article 15, clause 1 occurred and at 09:10AM, today, notified accordingly.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM, Mar 12th.
• Unit 1 : We started injection of sea water into the reactor core at 8:20PM, Mar 12 and then boric acid subsequently.
• Unit 2 : Reactor has been shut down and Reactor Core Isolation Cooling System has been injecting water to the reactor. Current reactor water level is lower than normal level, but the water level is steady. After fully securing safety, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels under the instruction of the national government.
• Unit 3 : High Pressure Coolant Injection System automatically stopped. We endeavored to restart the Reactor Core Isolation Cooling System but failed. Also, we could not confirm the water inflow of Emergency Core Cooling System. As such, we decided at 5.10AM, Mar 12, and we reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5:58AM, Mar 13. In order to fully secure safety, we operated the vent valve to reduce the pressure of the reactor containment vessels (partial release of air containing radioactive materials) and completed the procedure at 8:41AM, Mar 13 (successfully completed at 09:20AM, Mar 13). After that, we began injecting water containing boric acid that absorbs neutron into the reactor by the fire pump from 09:25AM, Mar 13.
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.
• The operator trapped in the crane operating console of the exhaust stack was transferred to the ground at 5:13PM and confirmed the death at 5:17PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]

• All the stations have been restored.

[Transmission System, etc.]
4 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.26 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 7,366
Chiba Pref. : 301
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 247,853
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW
Backup supply from Kitahon Interconnection Facility : 600MW

Because TEPCO’s facilities have been seriously damaged, power shortage may occur. TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 13,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 0pm March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 0pm March 13th)

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1 (Shut down)
 Reactor has been shut down. However, the unit is under inspection due to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 We have been injecting sea water and boric acid which absorbs neutron
into the reactor pressure vessel.

Unit 2 (Shut down)
 Reactor has been shut down and Reactor Core Isolation Cooling System has been injecting water to the reactor. Current reactor water level is lower than normal level, but the water level is steady. After fully securing
safety, measures to lowering the pressure of reactor containment vessel has been taken, under the instruction of the national government.

Unit 3 (Shut down)
 Reactor has been shut down. However, as High Pressure Core Injection
System has been automatically shut down and water injection to the
reactor was interrupted, following the instruction by the government and with fully securing safety, steps to lowering the pressure of reactor
containment vessel has been taken. Spraying in order to lower pressure
level within the reactor containment vessel has been cancelled.
 After that, safety relief valve has been opened manually, lowering the
pressure level of the reactor, which was immediately followed by
injection of sea water and boric acid which absorbs neutron, into the
reactor pressure vessel.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Casualty
 2 workers of cooperative firm were injured at the occurrence of the
earthquake, and were transported to the hospital.
 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
 The radiation exposure of 1 TEPCO employee, who was working inside the
reactor building, exceeded 100mSv and was transported to the hospital.
 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
 Presence of 2 TEPCO employees at the site are not confirmed

Others
 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive materials
level is higher than ordinary level. Also, the level at monitoring post
is higher than ordinary level. We will continue to monitor in detail the
possibility of radioactive material being discharged from exhaust stack
or discharge canal. The national government has instructed evacuation for
those local residents within 20km radius of the periphery because it’s
possible that radioactive materials are discharged.

 We will continue to take all measures to restore the security of the site
and to monitor the environment of the site periphery.

Press Release (Mar 13,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Extraordinary increase of radiation dose at site boundary)

Press Release (Mar 13,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Extraordinary increase of radiation dose at site boundary)

At 2:48PM on March 11th, turbines and reactors of Tokyo Electric Power
Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Miyagiken-oki Earthquake.

After the shut down, the values of radioactive materials (iodine, etc)
measured by the monitoring car have been increasing. Increase in the
measured value has also been recognized in one of the monitoring posts.

Furthermore, at 3:29PM, Mar 12, radiation dose measured at site boundary has exceeded the limiting value. Therefore, at 4:17PM, Mar 12, it was determined that a specific incident stipulated in article 15, clause 1
has occurred.

(as per the previous press release)

After that, the radiation dose at the monitoring post decreased once.
Today, the measured value revamped and the radiation dose measured at
site boundary exceeded the limiting value again. As such, at 8:56AM,
today, it was determined that a specific incident stipulated in article
15, clause 1 occurred.

We will endeavor to secure the safety and alongside, continue monitoring
the environment of the site periphery.

Press Release (Mar 13,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 9am March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 9am March 13th)

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 We have been injecting sea water and boric acid which absorbs neutron
into the reactor core.

Unit 2(Shut down)
 Reactor has been shut down and Reactor Core Isolation Cooling System has been injecting water to the reactor. Current reactor water level is lower than normal level, but the water level is steady. After fully securing
safety, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels under the instruction of the national
government.

Unit 3(Shut down)
 Reactor has been shut down. However, High Pressure Core Injection System
has been automatically shut down and water injection to the reactor is
currently interrupted. We are examining alternative way to inject water.
Also, following the instruction by the government and with fully securing safety, steps to lowering the pressure of reactor containment vessel has been taken. Spraying in order to lower pressure level within the reactor containment vessel has been cancelled.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Casualty
 2 workers of cooperative firm were injured at the occurrence of the
earthquake, and were transported to the hospital.
 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
 The radiation exposure of 1 TEPCO employee, who was working inside the
reactor building, exceeded 100mSv and was transported to the hospital.
 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
 Presence of 2 TEPCO employees at the site are not confirmed

Others
 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive materials
level is higher than ordinary level. Also, the level at monitoring post
is higher than ordinary level. We will continue to monitor in detail the
possibility of radioactive material being discharged from exhaust stack
or discharge canal. The national government has instructed evacuation for those local residents within 20km radius of the periphery because it’s
possible that radioactive materials are discharged.

 We will continue to take all measures to restore the security of the site
and to monitor the environment of the site periphery.

Press Release (Mar 13,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 8AM)

Press Release (Mar 13,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 8AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 20km radius of the site periphery.
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside of the site). One of the monitoring posts is also indicating higher than normal level.
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM, Mar 12 and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM, Mar 12.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM, Mar 12th.
• We started injection of sea water into the reactor core of Unit 1 at 8:20PM, Mar 12 and then boric acid subsequently.
• High Pressure Coolant Injection System of Unit 3 automatically stopped. We endeavored to restart the Reactor Core Isolation Cooling System but failed. Also, we could not confirm the water inflow of Emergency Core Cooling System. As such, we decided at 5.10AM, Mar 12, and we reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5:58AM, Mar 13. In order to fully secure safety, we operated the vent valve to reduce the pressure of the reactor containment vessels (partial release of air containing radioactive materials) and completed the procedure at 8:41AM, Mar 13,
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.
• The operator trapped in the crane operating console of the exhaust stack was transferred to the ground at 5:13PM and confirmed the death at 5:17PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]

• All the stations have been restored.

[Transmission System, etc.]
4 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.31 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 7,221
Chiba Pref. : 301
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 298,977
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 13,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness

Press Release (Mar 13,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness

At 2:46PM on March 11th 2011, turbines and reactors of Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake.

In all 3 Units, one offsite power system out of two was lost and diesel
generators were automatically activated.

At 3:41PM, diesel generators failed and as a result, all the AC power
was lost in Unit 1, 2 and 3. Following this incident, at 3:42PM, it was
determined that a specific incident stipulated in article 15, clause 1
has occurred, and level 1 emergency status was announced, together with
the notification to Ministry of Economy, Technology and Industry,
Governor of Fukushima prefecture, Mayors of Okuma town and Futaba town, and related institutions in accordance with the law.

(already announced)
Afterwards, in Unit 3, High Pressure Core Injection System has been
automatically shut down. Re-activation of Reactor Core Isolation Cooling
System was attempted but failed, and as we were unable to confirm the
level of water injection to the reactor by the Emergency Core Cooling
System, at 5:10 on March 13th, it was determined that a specific incident
(Emergency Core Cooling System water injection inability) stipulated in
article 15, clause 1 has occurred.

Press Release (Mar 13,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 2:00am March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 2:00am March 13th)

There is no update from the release issued at 1:00 am

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods was not properly inserted, however, at 10:43am the alarm was spontaneously called off. Other control rods has been confirmed that they are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate System.
 At 6:08pm, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22am, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22am,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am and finished at 6:00pm.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 At 5:32am, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:32am,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am and finished at 10:58pm.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm and finished at 12:13pm.
 Reactor cold shutdown at 12:15pm

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however, At 6:07am, the temperature of the suppression chamber exceeded 100 degrees.
As the reactor pressure suppression function was lost, at 6:07am, it was
determined that a specific incident stipulated in article 15, clause 1
has occurred.
 We decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am and finished at around 11:52am.
 Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal.

Press Release (Mar 13,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 2am March 13th)

Press Release (Mar 13,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 2am March 13th)

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due to
the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 We have been injecting sea water and boric acid which absorbs neutron
into the reactor core.

Unit 2(Shut down)
 Reactor and Reactor Core Isolation Cooling System have been shut down.
Current reactor water level is lower than normal level, but the water
level is steady. After fully securing safety, we are preparing to
implement a measure to reduce the pressure of the reactor containment
vessels under the instruction of the national government.

Unit 3(Shut down)
 Reactor has been shut down and we continue injecting water by High
Pressure Core Injection System. After fully securing safety, we are
preparing to implement a measure to reduce the pressure of the reactor
containment vessels under the instruction of the national government.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Casualty
 2 workers of cooperative firm were injured at the occurrence of the
earthquake, and were transported to the hospital.
 1 TEPCO employee who was not able to stand by his own with his hand
holding left chest was transported to the hospital by an ambulance.
 1 subcontract worker at important earthquake-proof building was
unconscious and transported to the hospital by an ambulance.
 The radiation exposure of 1 TEPCO employee, who was working inside the reactor building, exceeded 100mSv and was transported to the hospital.
 4 workers were injured and transported to the hospital after explosive
sound and white smoke were confirmed around the Unit 1.
 Presence of 2 TEPCO employees at the site are not confirmed

Others
 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive
materials level is higher than ordinary level. Also, the level at
monitoring post is higher than ordinary level. We will continue to
monitor in detail the possibility of radioactive material being
discharged from exhaust stack or discharge canal. The national
government has instructed evacuation for those local residents within
20km radius of the periphery because it’s possible that radioactive
materials are discharged.

 We will continue to take all measures to restore the security of
the site and to monitor the environment of the site periphery.

Press Release (Mar 12,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11PM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11PM March 12th )

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due
to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 
 Also, we have been injecting sea water into the reactor core and then
boric acid which absorbs neutron. However, we tentatively ceased the
operation factoring in the impact of potential tsunami following the
earthquake which occurred at 10:15PM. 

Unit 2(Shut down)
 Reactor and Reactor Core Isolation Cooling System have been shut down.
Current reactor water level is lower than normal level, but the water
level is steady. After fully securing safety, we are preparing to
implement a measure to reduce the pressure of the reactor containment
vessels under the instruction of the national government.

Unit 3(Shut down)
 Reactor has been shut down and we continue injecting water by High
Pressure Core Injection System. After fully securing safety, we are
preparing to implement a measure to reduce the pressure of the reactor
containment vessels under the instruction of the national government.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

 Currently, we are implementing a measure to reduce the pressure of the
reactor containment vessels of Unit 1. We have confirmed that the
radiation exposure of 1 TEPCO employee, who was working inside the
reactor building, exceeded 100mSv (106.3mSv). Because of the absence of industrial physician, we were scheduling diagnosis later. However, we
had him diagnosed by a specialist physician at the off-site center
because of the deconditioning.

 We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive
materials level is higher than ordinary level. Also, the level at
monitoring post is higher than ordinary level.

We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

The national government has instructed evacuation for those local
residents within 20km radius of the periphery because it’s possible
that radioactive materials are discharged.

Two workers of a cooperative firm were injured in the nuclear power
station premise. One with a broken bone was transported to the hospital
by an ambulance and the other by a company car.
Further, there are 2 TEPCO employees whose presence has not been
confirmed.
In addition, one subcontract worker standing near important earth
quake-proof buidling was unconscious and transported to the hospital
by an ambulance. When explosive sound was confirmed around the Unit 1
followed by white smoke, 4 workers were injured and transported to the
hospital.

We will continue to take all measures to restore the security of the
site and to monitor the environment of the site periphery.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 11pm March 12th)

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 11pm March 12th)

New Items are underlined

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was
spontaneously called off. Other control rods has been confirmed that they
are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 At 6:08pm, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we
do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:22am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am and finished at 6:00pm.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 At 5:32am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:32am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am and finished at 10:58pm.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. The preparation woke started at around 12:08pm and finished at 12:13pm.
 Reactor cold shutdown at 12:15pm

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 6:07am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am and finished at around 11:52am.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed.
We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while
keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker who had been trapped in the crane operating
console of the exhaust stack was transported to the ground at 5:13pm and
confirmed dead at 5:17pm. We sincerely pray for the repose of his soul.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. The worker has returned to
work after medical treatment and rest.
At 10:15pm, an earthquake occurred centered in offshore Fukushima
prefecture. No damage to the plant has been found at this moment.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 9pm March 12th)

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 9pm March 12th)

[There is no update from the release issued at 7:00pm, 8:00pm.]

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was
spontaneously called off. Other control rods has been confirmed that they
are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 At 6:08pm, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we
do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:22am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am and finished at 6:00pm.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 At 5:32am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:32am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure
of the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am and finished at 10:58pm.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm and finished at 12:13pm.
 Reactor cold shutdown at 12:15pm

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 6:07am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am and finished at around 11:52am.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed.
We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while
keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker who had been trapped in the crane operating
console of the exhaust stack was transported to the ground at 5:13pm and
confirmed dead at 5:17pm. We sincerely pray for the repose of his soul.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. The worker has returned to
work after medical treatment and rest.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 9PM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 9PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 20km radius of the site periphery.
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside of the site). One of the monitoring posts is also indicating higher than normal level.
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM. Our two employees and two cooperation workers who had been working for the foundation of safety are suffered and they are all sent to the hospital.
• We started injection of sea water into the reactor core of Unit 1 at 8:20pm and then boric acid subsequently.
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.
• The operator trapped in the crane operating console of the exhaust stack was transferred to the ground at 5:13PM and confirmed the death at 5:17PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]

• All the stations have been restored.

[Transmission System, etc.]
5 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.45 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 7,489
Chiba Pref. : 2,372
Saitama Pref : 534
Gunma Pref. : 0
Ibaraki Pref : 438,536
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing
electricity usage by avoiding using unnecessary lighting and electrical
equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 8pm March 12th)

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 8pm March 12th)

[There is no update from the release issued at 7:00pm.]

Unit 1 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was
spontaneously called off. Other control rods has been confirmed that they
are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 At 6:08pm, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we
do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:22am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am and finished at 6:00pm.

Unit 2 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 At 5:32am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:32am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am and finished at 10:58pm.

Unit 3 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm and finished at 12:13pm.

Unit 4 (shut down at 2:48pm on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in
the containment vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 6:07am, it was determined that a specific incident stipulated in
article 15, clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am and finished at around 11:52am.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We
will continue to monitor in detail the possibility of radioactive material
being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while
keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker who had been trapped in the crane operating
console of the exhaust stack was transported to the ground at 5:13pm and
confirmed dead at 5:17pm. We sincerely pray for the repose of his soul.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. The worker has returned
to work after medical treatment and rest.

Press Release (Mar 12,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 8PM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 8PM March 12th )

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down. However, the unit is under inspection due
to the explosive sound and white smoke that was confirmed after the big
quake occurred at 3:36PM. 4 workers were injured due to this incident
and they were transported to the hospital.

Unit 2(Shut down)
 Reactor and Reactor Core Isolation Cooling System have been shut down.
Current reactor water level is lower than normal level, but the water
level is steady. After fully securing safety, we are preparing to
implement a measure to reduce the pressure of the reactor containment
vessels under the instruction of the national government.

Unit 3(Shut down)
 Reactor has been shut down and we continue injecting water by High
Pressure Core Injection System. After fully securing safety, we are
preparing to implement a measure to reduce the pressure of the reactor
containment vessels under the instruction of the national government.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage
inside the reactor containment vessel.

Currently, we are implementing a measure to reduce the pressure of
the reactor containment vessels of Unit 1. We have confirmed that
the radiation exposure of 1 TEPCO employee, who was working inside
the reactor building, exceeded 100mSv (106.3mSv). Because of the absence of industrial physician, we were scheduling diagnosis later. However, we have transported him to the hospital because of the deconditioning.

We measured radioactive materials inside of the nuclear power station
area (outdoor) by monitoring car and confirmed that radioactive materials
level is higher than ordinary level. Also, the level at monitoring post
is higher than ordinary level.

We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

The national government has instructed evacuation for those local
residents within 20km radius of the periphery because it’s possible that
radioactive materials are discharged.

Two workers of a cooperative firm were injured in the nuclear power
station premise. One with a broken bone was transported to the hospital
by an ambulance and the other by a company car.
Further, there are 2 TEPCO employees whose presence has not been
confirmed.
In addition, one subcontract worker standing near important earth
quake-proof buidling was unconscious and transported to the hospital by
an ambulance.

We will continue to take all measures to restore the security of the site
and to monitor the environment of the site periphery.

Press Release (Mar 12,2011) Current Status of Fukushima Daiichi Nuclear Power Station(as of 7:00pm)

Press Release (Mar 12,2011)
Current Status of Fukushima Daiichi Nuclear Power Station(as of 7:00pm)

At 2:48PM on March 11th, turbines and reactors of Tokyo Electric Power
Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake. (already announced)

After the shutdown, today at 3:42PM, it was determined that a specific
incident stipulated in article 10, clause 1 has occurred as all the AC
power was lost in Unit 1, 2 and 3. Afterwards, today at 4:36PM, it was
determined that a specific incident stipulated in article 15, clause 1
has occurred as we were unable to confirm the level of water injection
to the reactor by the Emergency Core Cooling System.(already announced)

In Unit 1, steam in reactor has been cooled by isolation condenser. In
Unit 2 and 3, we continue injecting water by Reactor Core Isolation
Cooling System.

In Unit 4,5 and 6, sufficient level of reactor coolant to ensure safety
is maintained.

TEPCO employees have confirmed that there is no on-going fire inside
the site of Fukushima Daiichi Nuclear Power Station.
We have also confirmed that the value of radioactive materials inside
the site measured by the monitoring car has remained in the ordinary
level. We have been continuing the measurement.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 7PM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 7PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 10km# radius of the periphery (#as of 7:11PM, it has expanded to 20km).
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside of the site). One of the monitoring posts is also indicating higher than normal level.
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM. Our two employees and two cooperation workers who had been working for the foundation of safety are suffered and they are all sent to the hospital.
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being ¡Ènuclear reactor cooling hot stop¡É at 12:15PM.
• The operator seriously injured in the operating room of tower crane of exhaust stack was transferred to the ground at 5:13PM and confirmed the death at 5:17PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to
earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to
earthquake

[Hydro Power Station]

• All the stations have been restored.

[Transmission System, etc.]
5 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.5 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 7,227
Chiba Pref. : 4,162
Saitama Pref : 534
Gunma Pref. : 0
Ibaraki Pref : 486,226
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable
Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing
electricity usage by avoiding using unnecessary lighting and electrical
equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage
of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Avoidance of rolling blackout due to power supply shortage

Press Release (Mar 12,2011)
Avoidance of rolling blackout due to power supply shortage

The power supply capacity in TEPCO’s service area is reaching its limit
in meeting the power demand because its power supply facilities including
power stations such as Fukushima Daiichi and Daini nuclear power stations and transmission system have been seriously damaged due to
the Tohoku-Chihou-Taiheiyo-Oki Earthquake occurred on March 11th.

In this backdrop, we have notified our customers about the possibility of
rolling blackout this morning. However, because of the utilization of
UFR,we hereby notify our customers that we expect to be able to avoid
the rolling blackout tomorrow.

We continue to take all measures to recover facilities and secure power
supply. However, factoring in a difficult status of facilities, we may
be forced to implement rolling blackout from the next week.

We kindly ask our customers for continued cooperation in reducing usage
of needless lightning and electric appliances.

○Today’s Supply and Demand Estimate (Mar12, 2011)
Demand Prediction 36,000MW (18:00 to 19:00)
Supply Capacity 37,000MW
Reserve Capacity 1,000MW(3%)

○Tomorrow’s Supply and Demand Estimate(Mar13, 2011)
Demand Prediction 37,000MW
Supply Capacity 36,000MW
Reserve Capacity ▲1,000MW(▲3%)

* UFR(Under Frequency Relay)
:System that cuts off load automatically when frequency decreases.

Press Release (Mar 12,2011) White smoke around the Fukushima Daiichi Nuclear Power Station Unit 1

Press Release (Mar 12,2011)
White smoke around the Fukushima Daiichi Nuclear Power Station Unit 1

On March 11, 2011, turbines and reactors of Fukushima Daiichi Nuclear
Power Station Unit 1(Boiling Water Reactor, Rated Output 460 MW) and
Unit 2 and 3 (Boiling Water Reactor, Rated Output 784 MW) that had been
operating at rated power automatically shutdown due to the
Tohoku-Chihou-Taiheiyou-Oki Earthquake.(already announced)

Today at approximately 3:36PM, a big quake occurred and there was a big
sound around the Unit 1 and white smoke.
Our two employees and two subcontract workers working for the safety of
the plant were injured and transported to the hospital.

We are presently checking on the site situation of each plant and effect
of discharged radioactive materials.

We will endeavor to restore the units and continue monitoring the
environment of the site periphery.

Press Release (Mar 12,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Extraordinary increase of radiation dose at site boundary)

Press Release (Mar 12,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Extraordinary increase of radiation dose at site boundary)

At2:46PM on March 11th, turbines and reactors of Tokyo Electric Power
Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water
Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water
Reactor, Rated Output 784 Megawatts) that had been operating at rated
power automatically shutdown due to the Miyagiken-oki Earthquake.

After the shut down, the values of radioactive materials (iodine, etc)
measured by the monitoring car have been increasing. Increase in the
measured value has also been recognized in one of the monitoring posts.

Furthermore, today at 3:29PM, radiation dose measured at site boundary has exceeded the limiting value. Therefore, at 4:17PM, it was determined that a specific incident stipulated in article 15, clause 1 has occurred.

We will endeavor to secure the safety and alongside, continue monitoring
the environment of the site periphery.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 5PM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 5PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
 Units 1 to 3 : shutdown due to earthquake
 Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• The value of radioactive material (iodine, etc) is increasing according to the monitoring car at the site (outside of the site). One of the monitoring posts is also indicating higher than normal level.
• Since the amount of radiation at the boundary of the site exceeds the limits, we decide at 4:17PM and we have reported and/or noticed the government agencies concerned to apply the clause 1 of the Article 15 of the Radiation Disaster Measure at 5PM.
• In addition, a vertical earthquake hit the site and big explosion has happened near the Unit 1 and smoke breaks out around 3:36PM. Our two employees and two cooperation workers who had been working for the foundation of safety are suffered and they are all sent to the hospital.
• We continue endeavoring to secure the safety that all we can do and monitoring the periphery.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
5 stations in Fukushima Prefecture were shutdown due to earthquake.
Power stations in Yamanashi Prefecture have been restored.

[Transmission System, etc.]
5 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.54 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 12,204
Chiba Pref. : 18,080
Saitama Pref : 534
Gunma Pref. : 0
Ibaraki Pref : 505,072
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing
electricity usage by avoiding using unnecessary lighting and electrical
equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well. We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3PM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• Measurement of radioactive material (Iodine, etc.) by monitoring car indicates increasing value compared to normal level. One of the monitoring posts is also indicating higher than normal level. We will continue monitoring discharge of radioactive material from exhaust stack and discharge canal, etc.
• Reactor of Unit 1 has been shut down and steam in reactor has been cooled by isolation condenser, but it is now stopped. Because pressure level in reactor containment vessel is increasing, following the national government instruction, we have done the measure to reduce the pressure of the reactor containment vessels in order to fully secure safety and we understand that we have succeeded it at 2:30PM.
  At present, reactor water level is becoming lower and we are injecting water accordingly.
• Reactor of Unit 2 has been shut down and we continue injecting water by Reactor Core Isolation Cooling System. Current reactor water level is lower than normal level, but the water level is steady. Following the national government instruction, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels in order to fully secure safety.
• Reactor of Unit 3 has been shut down and we continue injecting water by Reactor Core Isolation Cooling System. Following the national government instruction, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels in order to fully secure safety.
• We are implementing a measure to reduce the pressure of the reactor containment vessels, but, one of our employees working in the Unit 1 was irradiated at over 100mSv level(106.3mSv). He received a medical treatment by a special physician.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1, 2 and 3 and accordingly, we have reported and/or noticed the government agencies concerned.
• Unit 3 has been stopped and being "nuclear reactor cooling hot stop" at 12:15PM.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
4 stations in Fukushima Prefecture were shutdown due to earthquake.
Power stations in Yamanashi Prefecture have been restored.

[Transmission System, etc.]
5 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 0.6 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 30,389
Chiba Pref. : 36,456
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 537,288
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable
Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur. TEPCO appreciates customers’ cooperation in reducing
electricity usage by avoiding using unnecessary lighting and electrical
equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 3PM arch 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 3PM arch 12th )

Unit 1 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was automatically called off. Other control rods have been confirmed that they are fully inserted (reactor is in subcritical status).
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 3:48AM, injection by Make-up Water
Condensate System begun.
 At 6:08PM, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we
do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 9:43am.

Unit 2 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status).
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 4:50AM, injection by Make-up Water
Condensate System begun.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 10:33AM and completed at 10:58AM.

Unit 3 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 12:08PM and completed at 12:13AM.
 At 12:15PM, the reactor achieved cold shut down.

Unit 4 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however, At
6:07AM, the temperature of the suppression chamber exceeded 100 degrees.
As the reactor pressure suppression function was lost, at 6:07AM, it was
determined that a specific incident stipulated in article 15, clause 1 has
occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 11:44AM and completed at 11:52AM.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We will continue to monitor in detail the possibility of radioactive material
being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while
keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console
of the exhaust stack and his breathing and pulse cannot be confirmed.
Currently, the rescue efforts are under way.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. After medical treatment
and subsequent rest, the worker has got back his workplace.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 1PM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 1PM March 12th )

Unit 1 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was automatically
called off. Other control rods has been confirmed that they are fully
inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 3:48AM, injection by Make-up Water
Condensate System begun.
 At 6:08PM, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we
do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am.

Unit 2 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 4:50AM, injection by Make-up Water
Condensate System begun.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 10:33AM and completed at 10:58AM.

Unit 3 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 12:08PM and completed at 12:13AM.
 At 12:15PM, the reactor achieved cold shut down.

Unit 4 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost,
at 6:07AM, it was determined that a specific incident stipulated in
article 15,clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work commenced at around 11:44AM and completed at 11:52AM.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We
will continue to monitor in detail the possibility of radioactive material
being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while
keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console
of the exhaust stack and his breathing and pulse cannot be confirmed.
Currently, the rescue efforts are under way.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. After medical treatment,
the worker is resting in the office.

Press Release (Mar 12,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 1PM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 1PM March 12th )

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down and steam in reactor has been cooled by
isolation condenser, but it is now stopped. Because pressure level in
reactor containment vessel is increasing, following the national
government instruction, we are implementing a measure to reduce the
pressure of the reactor containment vessels in order to fully secure
safety. Reactor water level is decreasing, we will continue injecting water step by step.

Unit 2(Shut down)
 Reactor has been shut down and we continue injecting water by Reactor
Core Isolation Cooling System. Current reactor water level is lower than normal level, but the water level is steady. Following the national
government instruction, we are preparing to implement a measure to reduce the pressure of the reactor containment vessels in order to fully secure safety.

Unit 3(Shut down)
 Reactor has been shut down and we continue injecting water by Reactor
Core Isolation Cooling System. Following the national government
instruction, we are preparing to implement a measure to reduce the
pressure of the reactor containment vessels in order to fully secure
safety.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

We are implementing a measure to reduce the pressure of the reactor
containment vessels, but, one of our employees working in the Unit 1 was irradiated at over 100mSv level(106.3mSv). Because of absence of industrial physician, so he will be diagnosed at a later day.

We measured radioactive materials inside of the nuclear power station area (outdoor) by monitoring car and confirmed that radioactive materials level is higher than ordinary level. Also, the level at monitoring post is higher than ordinary level.

We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

The national government has instructed evacuation for those local residents within 10km radius of the periphery because it’s possible that radioactive materials are discharged.

Two workers of a cooperative firm were injured in the nuclear power station premise. One with a broken bone was transported to the hospital by an ambulance and the other by a company car.
Also, one of our employees could not stand up holding his left chest, so
was transported to the hospital by an ambulance
Further, there are 2 TEPCO employees whose presence has not been confirmed.
In addition, one subcontract worker standing near important earth
quake-proof building was unconscious and transported to the hospital by an ambulance.

We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 11AM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 11AM March 12th )

Unit 1 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 At 8:19am, there was an alarm indicating that one of the control rods
was not properly inserted, however, at 10:43am the alarm was automatically called off. Other control rods has been confirmed that they are fully inserted (reactor is in subcritical status)(*)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 3:48AM, injection by Make-up Water
Condensate System begun.
 At 6:08PM, we announced the increase in reactor containment vessel
pressure, assumed to be due to leakage of reactor coolant. However, we do not believe there is leakage of reactor coolant in the containment vessel at this moment.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am.
(*) In the Press Release as of 9AM and 10AM, there was a statement that the control rods were fully inserted, however, we would like to correct such statement as above.

Unit 2 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 4:50AM, injection by Make-up Water
Condensate System begun.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 At 5:22AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 5:22AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am.

Unit 3 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety.

Unit 4 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently,
injection of water into the reactor is done by Make-up Water Condensate
System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.
 In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07AM, the temperature of the suppression chamber exceeded 100
degrees. As the reactor pressure suppression function was lost, at 6:07AM,
it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console of the exhaust stack and his breathing and pulse cannot be confirmed.
A worker was lightly injured spraining his left ankle and cutting both
knees when he fell while walking at the site. The worker is conscious.

Press Release (Mar 12,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11AM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11AM March 12th )

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1(Shut down)
 Reactor has been shut down and steam in reactor has been cooled by
isolation condenser, but now it is stopped. Because pressure level in
reactor containment vessel is increasing, we are implementing a measure to reduce the pressure of the reactor containment vessels in order to fully secure safety.
Reactor water level is decreasing, we will continue injecting water step
by step.

Unit 2(Shut down)
 Reactor has been shut down and we continue injecting water by Reactor
Core Isolation Cooling System. Current reactor water level is lower than
normal level, but the water level is steady. We are preparing to
implement a measure to reduce the pressure of the reactor containment
vessels in order to fully secure safety.

Unit 3(Shut down)
 Reactor has been shut down and we continue injecting water by Reactor
Core Isolation Cooling System. We are preparing to implement a measure
to reduce the pressure of the reactor containment vessels in order to
fully secure safety.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 4 (shut down due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

We measured radioactive materials inside of the nuclear power station area (outdoor) by monitoring car and confirmed that radioactive materials level is higher than ordinary level. Also, the level at monitoring post is higher than ordinary level.

We will continue to monitor in detail the possibility of radioactive
material being discharged from exhaust stack or discharge canal.

The national government has instructed evacuation for those local residents within 10km radius of the periphery because it¡Çs possible that radioactive materials are discharged.

Two workers of a cooperative firm were injured in the nuclear power station premise. One with a broken bone was transported to the hospital by an ambulance and the other by a company car.
Further, there are 2 TEPCO employees whose presence has not been confirmed.
In addition, one subcontract worker standing near important earth
quake-proof buidling was unconscious and transported to the hospital by an ambulance.

We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 10AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 10AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• Measurement of radioactive material (Iodine, etc.) by monitoring car indicates increasing value compared to normal level. One of the monitoring posts is also indicating higher than normal level. We will continue monitoring discharge of radioactive material from exhaust stack and discharge canal, etc.
• Considering the increasing pressure with in the reactor containment vessel of Unit 1, the national government has instructed us to implement measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery.
• At present, we have decided to prepare implementing measures to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety. These measures are considered to be implemented in Units 1 to 4 and accordingly, we have reported and/or noticed the government agencies concerned.

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
5 stations in Fukushima Prefecture were shutdown due to earthquake.
Power stations in Yamanashi Prefecture have been restored.

[Transmission System, etc.]
5 substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Nishi Mito Substation

[Blackout in TEPCO’s Service Area]
Total of about 1 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 5,533
Tochigi Pref. : 214,817
Chiba Pref. : 134,611
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 642,657
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 8 AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 8 AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM. *new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• The national government has instructed evacuation for those local residents within 10km radius of the periphery.
• Measurement of radioactive material (Iodine, etc.) by monitoring car indicates increasing value compared to normal level. One of the monitoring posts is also indicating higher than normal level. We will continue monitoring discharge of radioactive material from exhaust stack and discharge canal, etc.
• We have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

• The national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery. (We are very sorry to have informed wrongly about evacuation area in our press release at 7am.)

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• There was no shutdown due to the earthquake occurred in the northern part of Nagano Prefecture at around 3:58AM today.
• Survey data on radiation by exhaust stack monitors and monitoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
8 stations in Fukushima Prefecture, 2 stations in Yamanashi Prefecture, were shutdown due to earthquake.
Power stations in Tochigi Prefecture have been restored.

[Transmission System, etc.]
Six substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 1.09 million households are out of power.
Tokyo : 308
Kanagawa Pref. : 0
Tochigi Pref. : 238,872
Chiba Pref. : 196,994
Saitama Pref : 0
Gunma Pref. : 0
Ibaraki Pref : 658,170
Yamanashi Pref : 0
Shizuoka Pref : 0 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 4)

Press Release (Mar 12,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 4)

At 2:48PM on March 11th, the reactor of Fukushima Daini Nuclear Power
Station Unit 1 (Boiling Water Reactor, rated output 1,100 Megawatts) shut down due to the impact of the earthquake.

Make-up Water Condensate System was used to inject water into the reactor to cool it.
Subsequently, at 6:07AM, the temperature of the suppression chamber
exceeded 100 degrees.
As the reactor pressure suppression function was lost, at 6:07AM, it was
determined that a specific incident stipulated in article 15, clause 1 has
occurred.

Safety and Impact to the Environment
 Currently, water level to cool irradiated fuels in the reactor is
maintained.
 Indication of monitoring posts installed in the site boundary is not
different from normal. Currently, no radiation impact to the external
environment has been confirmed.

We will continue monitoring in detail discharge of radioactive material
from exhaust stack and discharge canal.

Press Release (Mar 12,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 2)

Press Release (Mar 12,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 2)

At 2:48PM on March 11th, the reactor of Fukushima Daini Nuclear Power
Station Unit 1 (Boiling Water Reactor, rated output 1,100 Megawatts) shut down due to the impact of the earthquake.

Reactor Core Isolation Cooling System was used to inject water into the
reactor to cool it. Today at 4:50AM, water injection by Make-up Water
Condensate System begun.
Subsequently, at 5:32AM, the temperature of the suppression chamber
exceeded 100 degrees.
As the reactor pressure suppression function was lost, at 5:32AM, it was
determined that a specific incident stipulated in article 15, clause 1 has
occurred.

Safety and Impact to the Environment
 Currently, water level to cool irradiated fuels in the reactor is
maintained.
 Indication of monitoring posts installed in the site boundary is not
different from normal. Currently, no radiation impact to the external
environment has been confirmed.

We will continue monitoring in detail discharge of radioactive material
from exhaust stack and discharge canal.

Press Release (Mar 12,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 1)

Press Release (Mar 12,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 1)

At 2:48PM on March 11th, the reactor of Fukushima Daini Nuclear Power
Station Unit 1 (Boiling Water Reactor, rated output 1,100 Megawatts) shut down due to the impact of the earthquake.

Reactor Core Isolation Cooling System was used to inject water into the
reactor to cool it. Today at 3:48AM, water injection by Make-up Water
Condensate System begun.
Subsequently, at 5:22AM, the temperature of the suppression chamber
exceeded 100 degrees.
As the reactor pressure suppression function was lost, at 5:22AM, it was
determined that a specific incident stipulated in article 15, clause 1 has
occurred.

Safety and Impact to the Environment
 Currently, water level to cool irradiated fuels in the reactor is
maintained.
 Indication of monitoring posts installed in the site boundary is not
different from normal. Currently, no radiation impact to the external
environment has been confirmed.

We will continue monitoring in detail discharge of radioactive material
from exhaust stack and discharge canal.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 7 AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 7 AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 10 km radius of Fukushima Daiichi Nuclear Power Station and Fukushima Daini Nuclear Power Station.
• Measurement of radioactive material (Iodine, etc.) by monitoring car indicates increasing value compared to normal level. One of the monitoring posts is also indicating higher than normal level. We will continue monitoring discharge of radioactive material from exhaust stack and discharge canal, etc.
• We have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• There was no shutdown due to the earthquake occurred in the northern part of Nagano Prefecture at around 3:58AM today.
• Survey data on radiation by exhaust stack monitors and monitoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
11 stations in Fukushima Prefecture, 1 station in Tochigi Prefecture,
3 stations in Yamanashi Prefecture, were shutdown due to earthquake.
Power stations in Gunma Prefecture have been restored.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 1.17 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 296,363
Chiba Pref. : 211,944
Saitama Pref : 0
Gunma Pref. : 12
Ibaraki Pref : 662,189
Yamanashi Pref : 0
Shizuoka Pref : 11,819 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 6 AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 6 AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station
• Measurement of radioactive material (Iodine, etc.) by monitoring car indicates increasing value compared to normal level. One of the monitoring posts is also indicating higher than normal level. We will continue monitoring discharge of radioactive material from exhaust stack and discharge canal, etc.
• We have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• There was no shutdown due to the earthquake occurred in the northern part of Nagano Prefecture at around 3:58AM today.
• Survey data on radiation by exhaust stack monitors and monitoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
1 station in Gunma Prefecture, 4 stations in Yamanashi Prefecture,
1 station in Niigata Prefecture, were shutdown due to earthquake. Power
Stations in Niigata Prefecture have been restored.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 1.24 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 0
Tochigi Pref. : 344,303
Chiba Pref. : 216,144
Saitama Pref : 0
Gunma Pref. : 27
Ibaraki Pref : 683,471
Yamanashi Pref : 0
Shizuoka Pref : 11,819 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 5AM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 5AM March 12th )

Unit 1 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 3:48AM, injection by Make-up Water
Condensate System begun.
 At 6:08PM, we announced the increase in reactor containment vessel pressure, assumed to be due to leakage of reactor coolant. However, we do not believe there is leakage of reactor coolant in the containment vessel at this moment.

Unit 2 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 4:50AM, injection by Make-up Water
Condensate System begun.
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 3 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently, injection of water into the reactor is done by Make-up Water Condensate System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 4 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 Reactor Core Isolation Cooling System is turned off. Currently, injection
of water into the reactor is done by Make-up Water Condensate System.
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Indication from monitoring posts installed at the site boundary did not show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console of the exhaust stack and his breathing and pulse cannot be confirmed.
A worker was lightly injured spraining his left ankle and cutting both knees when he fell while walking at the site. The worker is conscious.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 4AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 4AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station
• We have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• There was no shutdown due to the earthquake occurred in the northern part of Nagano Prefecture at around 3:58AM today.
• Survey data on radiation by exhaust stack monitors and monitoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture, 1
station in Gunma Prefecture, 4 stations in Yamanashi Prefecture, 1 station in Niigata Prefecture, were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 1.62 million households are out of power.
Tokyo : 0
Kanagawa Pref. : 24,904
Tochigi Pref. : 458,016
Chiba Pref. : 228,824
Saitama Pref : 34,346
Gunma Pref. : 65,668
Ibaraki Pref : 695,792
Yamanashi Pref : 103,496
Shizuoka Pref : 11,819 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnecessary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Implementation of Measures to Reduce the Pressure of Reactor Containment Vessel of Fukushima Daiichi Nuclear Power Station

Press Release (Mar 12,2011)
Implementation of Measures to Reduce the Pressure of Reactor Containment Vessel of Fukushima Daiichi Nuclear Power Station

Today at approximately 2:46PM, turbines and reactors of Tokyo Electric Power Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake. (already announced)

At this moment, we have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

We will endeavor to restore the units and continue monitoring the environment of the site periphery.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 3AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station.
• We have decided to implement measures to reduce the pressure of the reactor containment vessel for those units that cannot confirm certain level of water injection by the Reactor Core Isolation Cooling System, in order to fully secure safety.

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 1.77 million households are out of power.
Tokyo : 3,106
Kanagawa Pref. : 85,749
Tochigi Pref. : 458,016
Chiba Pref. : 266,562
Saitama Pref : 36,117
Gunma Pref. : 81,517
Ibaraki Pref : 716,283
Yamanashi Pref : 106,044
Shizuoka Pref : 11,819 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnessesary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 2AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 2AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Motegi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 2.07 million households are out of power.
Tokyo : 3,106
Kanagawa Pref. : 101,928
Tochigi Pref. : 500,842
Chiba Pref. : 307,887
Saitama Pref : 98,425
Gunma Pref. : 155,101
Ibaraki Pref : 725,717
Yamanashi Pref : 106,044
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage
by avoiding using unnessesary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.

A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM yesterday.

Press Release (Mar 12,2011) Plant Status of Fukushima Daini Nuclear Power Station (as of 0 AM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 0 AM March 12th )

Unit 1 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 At 6:08PM, we announced the increase in reactor containment vessel pressure, assumed to be due to leakage of reactor coolant. However, we do not believe there is leakage of reactor coolant in the containment vessel at this moment.

Unit 2 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 3 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 4 (shut down at 2:48PM on March 11th)
 Reactor is shut down and reactor water level is stable.
 Offsite power is available.
 Control rods are fully inserted (reactor is in subcritical status)
 Status of main steam isolation valve : closed
 We do not believe there is leakage of reactor coolant in the containment
vessel.

Indication from monitoring posts installed at the site boundary did not show any difference from ordinary level.
No radiation impact to the external environment has been confirmed.
We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal.

There is no missing person within the power station.
We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console of the exhaust stack and his breathing and pulse cannot be confirmed.
A worker was lightly injured spraining his left ankle and cutting both knees when he fell while walking at the site. The worker is conscious.

Press Release (Mar 12,2011) Plant Status of Fukushima Daiichi Nuclear Power Station (as of 0AM March 12th )

Press Release (Mar 12,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 0AM March 12th )

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

Unit 1 (shut down due to earthquake)
 Reactor was shut down and nuclear steam is cooled by the isolation condenser.
 Currently, there is a possibility of a release of radioactive materials
due to decrease in reactor water level. Therefore, the national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery.

Unit 2 (shut down due to earthquake)
 Reactor was shut down and although nuclear steam had been cooled by the Reactor Core Isolation Cooling system, the current operating status is unclear. However, reactor coolant level can be monitored by a temporary power supply and the level is stable.
 Currently, there is a possibility of a release of radioactive materials
due to decrease in reactor water level. Therefore, the national government has instructed evacuation for those local residents within 3km radius of the periphery and indoor standby for those local residents between 3km and 10km radius of the periphery.

Unit 3 (shut down due to earthquake)
 Reactor was shut down and is cooled by the Reactor Core Isolation Cooling system.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 4 (shut down due to earthquake)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 5 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

Unit 6 (outage due to regular inspection)
 Reactor has been shut down and sufficient level of reactor coolant to
ensure safety is maintained.
 Currently, we do not believe there is any reactor coolant leakage inside
the reactor containment vessel.

We measured radioactive materials inside and outside of the periphery of
the nuclear power station (outdoor area) by monitoring car and confirmed
that there was no difference from ordinary level.

No radiation impact to the external environment has been confirmed.
We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal.

Two subcontract workers were injured in the nuclear power station premise.
One with a broken bone was transported to the hospital by an ambulance and the other by a company car.
Further, there are 2 TEPCO employees whose presence has not been confirmed.

We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 1AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 1AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : had been shutdown due to earthquake but has restarted
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Mogi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 2.4 million households are out of power.
Tokyo : 3,106
Kanagawa Pref. : 179,068
Tochigi Pref. : 568,281
Chiba Pref. : 343,142
Saitama Pref : 164,978
Gunma Pref. : 224,957
Ibaraki Pref : 726,110
Yamanashi Pref : 106,044
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage
by avoiding using unnessesary lighting and electrical equipment.

We are taking all measures to restore power, however, we expect extremely difficult situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.
A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM yesterday.

Press Release (Mar 12,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 0AM)

Press Release (Mar 12,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 0AM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred yesterday at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Mogi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation
 Mito Hokubu Substation

[Blackout in TEPCO’s Service Area]
Total of about 2.58 million households are out of power.
Tokyo : 3,106
Kanagawa Pref. : 277,998
Tochigi Pref. : 567,925
Chiba Pref. : 347,113
Saitama Pref : 198,468
Gunma Pref. : 224,957
Ibaraki Pref : 734,187
Yamanashi Pref : 117,068
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnessesary lighting and electrical equipment.
We are also making requests to some large-scale customers with contracts to partially suspend operation to suppress usage of power.

We are taking all measures to restore power, however, we expect extremely challenging situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.
A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM yesterday.

Press Release (Mar 11,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 11PM)

Press Release (Mar 11,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 11PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred today at 2:46PM.
*new items are underlined

[Nuclear Power Station]

Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : shutdown due to earthquake
Higashi-Ohgishima Thermal Power Station Unit 1 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Mogi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation

[Blackout in TEPCO’s Service Area]
Total of about 2.97 million households are out of power.
Tokyo : 78,273
Kanagawa Pref. : 463,121
Tochigi Pref. : 567,925
Chiba Pref. : 347,609
Saitama Pref : 310,772
Gunma Pref. : 225,524
Ibaraki Pref : 735,892
Yamanashi Pref : 123,925
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnessesary lighting and electrical equipment.
We are also making requests to some large-scale customers with contracts to partially suspend operation to suppress usage of power.

We are taking all measures to restore power, however, we expect extremely challenging situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.
A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM today.

Press Release (Mar 11,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 10PM)

Press Release (Mar 11,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 10PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred today at 2:46PM.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

• Evacuation has been instructed by the national government to the local residents within 3 km radius of Fukushima Daiichi Nuclear Power Station

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Mogi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation

[Blackout in TEPCO’s Service Area]
Total of about 3.44 million households are out of power.
Tokyo : 78,273
Kanagawa Pref. : 813,203
Tochigi Pref. : 567,925
Chiba Pref. : 347,609
Saitama Pref : 328,165
Gunma Pref. : 225,524
Ibaraki Pref : 823,255
Yamanashi Pref : 145,009
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnessesary lighting and electrical equipment.
We are also making requests to some large-scale customers with contracts to partially suspend operation to suppress usage of power.

We are taking all measures to restore power, however, we expect extremely challenging situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of
power.

Please do NOT touch cut-off electric wires.
A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM today.

Press Release (Mar 11,2011) Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 9PM)

Press Release (Mar 11,2011)
Impact to TEPCO’s Facilities due to Miyagiken-Oki Earthquake (as of 9PM)

Below is major impact to TEPCO’s facilities due to the Miyagiken-Oki
Earthquake that occurred today at 2:46PM.

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station :
Units 1 to 3 : shutdown due to earthquake
Units 4 to 6 : outage due to regular inspection

Fukushima Daini Nuclear Power Station :
Units 1 to 4 : shutdown due to earthquake

Kashiwazaki Kariwa Nuclear Power Station :
Units 1, 5, 6, 7 : normal operation
Units 2 to 4 : outage due to regular inspection

• Survey data on radiation by exhaust stack monitors and montoring cars have indicated no departure from normal level for all nuclear power stations.

[Thermal Power Station]
Hirono Thermal Power Station Units 2 and 4 : shutdown due to earthquake
Hitachinaka Thermal Power Station Unit 1 : shutdown due to earthquake
Kashima Thermal Power Station Units 2, 3, 5, 6 : shutdown due to earthquake
Chiba Thermal Power Station Unit 2 Axis 1 : shutdown due to earthquake
Ohi Thermal Power Station Units 2, 3 : shutdown due to earthquake
Goi Thermal Power Station Unit 4 : shutdown due to earthquake

[Hydro Power Station]
14 stations in Fukushima Prefecture, 4 stations in Tochigi Prefecture,
4 stations in Yamanashi Prefecture were shutdown due to earthquake.

[Transmission System, etc.]
Eight substations shown below have been shutdown :
 Naka Substation
 Shin Mogi Substation
 Joban Substation
 Ibaraki Substation
 Ishioka Substation
 Nishi Mito Substation
 Kawachi Substation
 Haga Substation

[Blackout in TEPCO’s Service Area]
Total of about 3.8 million households are out of power.
Tokyo : 102,359
Kanagawa Pref. : 1,135,827
Tochigi Pref. : 568,807
Chiba Pref. : 347,609
Saitama Pref : 342,878
Gunma Pref. : 225,524
Ibaraki Pref : 823,404
Yamanashi Pref : 145,009
Shizuoka Pref : 113,051 (east of Fuji River)

[Supply and Demand Status within TEPCO’s Service Area to Secure Stable Power Supply]
Backup supply from Shinshinano Conversion Station : 600MW
Backup supply from Sakuma Conversion Station : 300MW
Backup supply from Higashi Shimizu Conversion Station : 100MW

Because TEPCO’s facilities have been seriously damaged, power shortage
may occur.
TEPCO appreciates customers’ cooperation in reducing electricity usage by avoiding using unnessesary lighting and electrical equipment.
We are also making requests to some large-scale customers with contracts to partially suspend operation to suppress usage of power.

We are taking all measures to restore power, however, we expect extremely challenging situation in power supply for tomorrow as well.
We kindly ask our customers to cooperate with us in reducing usage of power.

Please do NOT touch cut-off electric wires.
A temporary small fire occured at a service building in Fukushima Daini
Nuclear Power Station. However, it was extinguished at 4:07 PM today.

Press Release (Mar 11,2011) Occurrence of a Specific Incident Stipulated in Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daini)

Press Release (Mar 11,2011)
Occurrence of a Specific Incident Stipulated in Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daini)

Today at 2:46PM, turbines and reactors of Tokyo Electric Power Company’s Fukushima Daini Nuclear Power Station Units 1 to 4 (Boiling Water Reactor, rated output 1,100 Megawatts) that had been operating at rated power automatically shutdown due to the Miyagiken-oki Earthquake.

Currently, reactor water level for Units 1 to 4 is maintained by injecting
water into the reactors by the Reactor Core Isolation Cooling System.
The reactors are maintained at a subcritical condition.

For Unit 1, the emergency core cooling system automatically started up
due to increase in the reactor containment pressure assumed to be caused
by leakage of reactor coolant in the reactor containment.

Hence, at 5:35PM, it was decided that a specific incident stipulated in
Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness *1 has occurred.

At 5:50PM, pursuant to the Act, relevant governmental institutions were
notified of the incident.

Future Actions :
TEPCO is taking measures to reduce the pressure of the reactor containment.

Impact to safety and external environment :
Water level to cool the irradiated nuclear fuel in the reactor core is
maintained at this moment.
Indication of the monitoring posts installed in the periphery of the power station is no different from usual and thus no radiation impact to the external environment is confirmed at this moment. We will continue to monitor in detail the possibility of discharge of radioactive material from exhaust stacks and coolant water discharge canal.

*1 Specific Incident Stipulated in Article 10, Clause 1 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness

The objective of the Act on Special Measures Concerning Nuclear
Emergency Preparedness is to protect the welfare, physical wellbeing
and property of Japan’s citizens. To this end, when accidents and
equipment breakdown have reached certain levels at nuclear power plants,
the Act obligates us to notify the nation, prefectures, cities and towns
in order for them to take necessary actions and to grasp information in
a timely manner.

Notifications are issued out under circumstances such as when the nuclear reactor cannot be shut down and/or when the water supply to the reactor is cut off.

*2 Monitoring Post
Equipment to measure the radiation level in the atmosphere. Seven units are installed in the periphery of the power station.

Press Release (Mar 11,2011) Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daiichi)

Press Release (Mar 11,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daiichi)

Today at approximately 2:46PM, turbines and reactors of Tokyo Electric
Power Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Miyagiken-oki Earthquake.

For the above 3 units, off-site power was lost due to malfunction of one
out of two off-site power systems, leading to automatic startup of
emergency diesel generators.

Subsequently, at 3:41PM, emergency diesel generators shutdown due to
malfunction resulting in the complete loss of alternating current for all
three units.

Hence, at 3:42PM, it was decided that a specific incident stipulated in
Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear
Emergency Preparedness has occurred and a "First Level Emergency" was declared and in accordance with the aforementioned Act, the Minister of Economy, Trade, and Industry, the Governor of Fukushima Prefecture, the Mayor of Okuma Town, and the Mayor of Futaba Town along with other involved organizations were notified of the incident.

TEPCO is taking steps to determine the exact cause behind the shutdown of the emergency diesel generators and is working towards their restoration.

(already notified)
Subsequently, since the status of reactor water coolant injection could
not be confirmed for the emergency core cooling systems of Units 1 and 2,
at 4:36PM, it was decided that a specific incident stipulated in Article
15, Clause 1 of the Act has occurred.

We have then notified the Minister of Economy, Trade, and Industry, the
Governor of Fukushima Prefecture, the Mayor of Okuma Town, and the Mayor of Futaba Town along with other involved organizations of the incident.

Article 15, Clause 1 of the Act was cleared when the reactor water level
monitoring function was restored for Unit 1. However, at 5:07PM, specific
incident stipulated in Article 15, Clause 1 of the Act was applied again
for Unit 1.

Press Release (Mar 11,2011) Occurrence of a Specific Incident Stipulated in Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daiichi)

Press Release (Mar 11,2011)
Occurrence of a Specific Incident Stipulated in Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daiichi)

Today at approximately 2:46PM, turbines and reactors of Tokyo Electric
Power Company’s Fukushima Daiichi Nuclear Power Station Unit 1 (Boiling Water Reactor, rated output 460 Megawatts) and Units 2 and 3 (Boiling Water Reactor, Rated Output 784 Megawatts) that had been operating at rated power automatically shutdown due to the Miyagiken-oki Earthquake.

For the above 3 units, off-site power was lost due to malfunction of one
out of two off-site power system, leading to automatic startup of
emergency diesel generators.

Subsequently, at 3:41PM, emergency diesel generators shutdown due to
malfunction resulting in the complete loss of alternating current for
all three units.

Hence, at 3:42PM, it was decided that a specific incident stipulated
in Article 10, Clause 1 of the Act on Special Measures Concerning
Nuclear Emergency Preparedness*1 has occurred and a "First Level Emergency" was declared and in accordance with the aforementioned Act, the Minister of Economy, Trade, and Industry, the Governor of Fukushima Prefecture, the Mayor of Okuma Town, and the Mayor of Futaba Town along with other involved organizations were notified of the incident.

TEPCO is taking steps to determine the exact cause behind the shutdown
of the emergency diesel generators and is working towards their restoration.
The exhaust pipe’s monitor reading indicates that radiation levels have
remained unchanged and presently there have been no confirmed radioactivity impact to external environment. Further details are in the process of being confirmed.

*1 Specific Incident Stipulated in Article 10, Clause 1 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness

The objective of the Act on Special Measures Concerning Nuclear Emergency Preparedness is to protect the welfare, physical wellbeing and property of Japan’s citizens. To this end, when accidents and equipment breakdown have reached certain levels at nuclear power plants, the Act obligates us to notify the nation, prefectures, cities and towns in order for them to take necessary actions and to grasp information in a timely manner.

Notifications are issued out under circumstances such as when the nuclear
reactor cannot be shut down and/or when the water supply to the reactor
is cut off.

Press Release (Mar 11,2011) The Effect of Earthquake Occurred in the Northern Part of Japan(as of 4:30 pm today)

Press Release (Mar 11,2011)
The Effect of Earthquake Occurred in the Northern Part of Japan(as of 4:30 pm today)

A big earthquake occurred in the Miyagi Prefecture at 2:46 today. Due
to the earthquake, about 4.05 million households are in power outage
in our service area.

Due to the earthquake, our power facilities have huge damages, so we
are afraid that power supply tonight would run short. We strongly ask
our customers to conserve electricity.
If you find any disconnected transmission lines, please do not touch
them.

The effect of the earthquake to our facilities is as follows ;

Fukushima Daiichi
 Unit 1,2,3 were operated and automatically stopped.
 Unit 4,5,6 are in regular inspection.

Fukushima Daini
 Unit 1,2,3,4 were operated and automatically stopped.

Kashiwazaki-Kariwa
 Unit 1,5,6,7 are in operation.
 Unit 2,3,4 are in regular inspection.

At all the nuclear power stations, monitoring posts, which monitor
radiation through exhaust stacks have shown normal values. In other
words, at the present, no radiation leaks have been confirmed.

(Thermal Power Stations)
 Hirono Unit 2,4 were stopped.
 Hitachinaka Unit 1 was stopped.
 Kahshima Unit 2,3,5,6 were stopped.
 Chiba Unit 2-Group 1 was stopped.
 Yokohama Unit 8-Group 4 was stopped.
 Ohi Unit 2,3 were stopped.
 Goi Unit 4 was stopped.

(Hydro Power Stations)
 15 power stations in Fukushima, 3 power stations in Tochigi, 3 power
stations in Yamanashi, 1 power station in Gumma were stopped.

(Transmission and Distribution Facilities)
 Naka Distribution Facility was stopped.
 Shin-Mogi Distribution Facility was stopped.

(Others)
 At the service facility(not nuclear facilities) of the Fukushima
Daini Nuclear Power Station, a small fire temporarily occurred but
was extinguished at 4:07 pm.

Press Release (Feb 03,2011) Status of the Inspection and Restoration Works Performed after the Niigata-Chuetsu-Oki Earthquake (as of February 3)

Press Release (Feb 03,2011)
Status of the Inspection and Restoration Works Performed after the Niigata-Chuetsu-Oki Earthquake (as of February 3)

We are announcing the status of major inspections and restoration works
and non conformances at TEPCO’s Kashiwazaki-Kariwa Nuclear Power Station after the Niigata-Chuetsu-Oki Earthquake.

Inspection/ Restoration Status

◇ Inspection and restoration completed between January 28 to February
3, 2011 (Completed on the following date)

 Unit 3 Seismic reinforcement works (Seismic reinforcement works such as pipe supports) : January 31, 2011

◇ Inspection and restoration to be commenced between February 4 to
February 10, 2011 (To be commenced on the following date)

 Unit 3 System functional test (Functional test of control rod drive
mechanism) : February 5, 2011
 Unit 3 System functional test (Functional test of primary containment
vessel isolation valve) : February 9, 2011

 Unit 3 System functional test (Functional test of feed water pump) :
February 10, 2011

◇ Work Schedule of Major Inspection and Restoration from January 30 to
February 26, 2011

 Work Schedule of the Main Inspection/ Restoration of the Kashiwazaki-
Kariwa Nuclear Power Station in Response to the Niigata-Chuetsu-Oki
Earthquake (during 4 Weeks) ...Appendix