Status of Fukushima Daiichi Nuclear Power Station as of 11:00 PM Mar 17th

Press Release (Mar 17,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 11:00 PM Mar 17th)

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

Unit 1(Shut down)
– Reactor has been shut down. However, the explosive sound and white smoke
were confirmed after the big quake occurred at 3:36PM Mar 12th. It was
assumed to be hydrogen explosion.
– We have been injecting sea water 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. However, the level of reactor
coolant had dropped and the reactor pressure had increased because
the system stopped. The national government instructed that measures are
taken to lower the pressure within the Reactor Containment Vessel and
to inject sea water into the Reactor while carefully confirming safety.
The level of reactor coolant and the pressure of the Reactor had resumed.
– At approximately 6:00AM on March 15, 2011, an abnormal noise began
emanating from nearby Pressure Suppression Chamber and the pressure
within this chamber decreased.
– While we continue sea water injection operations, we temporarily moved
TEPCO employees and workers from other companies not directly involved
in this work to safe places.

Unit 3(Shut down)
– Reactor has been shut down. However, the explosive sound and white smoke
were confirmed at 11:01AM Mar 14th. It was assumed to be hydrogen explosion.
– Fog like steam was confirmed from the reactor building at 8:30AM on
March 16th,
– We continue monitoring as it was reported that the pressure of
the Suppression Chamber has been temporarily increasing since
approximately 6:15AM on March 17th.
– We have been injecting sea water into the reactor pressure vessel.

Unit 4 (outage due to regular inspection)
– Reactor has been shut down. However, at approximately 6AM on March 15th.
we have confirmed the explosive sound and the sustained damage around
the 5th floor rooftop area of the Nuclear Reactor Building.
– On March 15th and 16th, we respectively confirmed the outbreak of fire
at the 4th floor of the northwestern part of the Nuclear Reactor
Building. We immediately reported this matter to the fire department and
the related authorities. TEPCO employees confirmed that each fire had
already died down by itself. We will continue to carefully monitor
situations.
– Currently, we do not consider any reactor coolant leakage inside
the reactor containment vessel.

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

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

Cooling spent fuel pools
•On Unit 3, water discharge by Self-Defense Force’s helicopters had been
conducted since 9:48 AM in the morning on March 17th.
•On Unit 3, water discharge by the riot police’s high-pressure water
cannon trucks and Self-Defense Force’s fire engines had been conducted
since approximately past 7PM on March 17th and they had finished water
discharge at 8:09PM.
•We are considering further water discharge at Unit 3 and others subject
to the conditions of spent fuel pools when we get ready.

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 holding left chest
with his hand, was transported to the hospital by an ambulance.
– 1 subcontract worker at the key 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 he 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.
– 11 workers were injured and transported to Fukushima Daini Nuclear Power
Station etc. after explosive sound and white smoke were confirmed around
the Unit 3.One of the workers was transported to the FUKUSHIMA Medical
University Hospital at 10:56AM
– Presence of 2 TEPCO employees at the site is not confirmed.

Others
– We measured radioactive materials (iodine etc.) inside of the nuclear
power station area (outdoor) by monitoring car and confirmed that
radioactive materials level is getting higher than ordinary level.
As listed below, we have determined that specific incidents stipulated
in article 15, clause 1 of Act on Special Measures Concerning Nuclear
Emergency Preparedness (Abnormal increase in radiation dose measured
at site boundary) have occurred.
•Determined at 4:17 PM Mar 12th (Around Monitoring Post 4 )
•Determined at 8:56 AM Mar 13th (Around Monitoring Post 4 )
•Determined at 2:15 PM Mar 13th (Around Monitoring Post 4 )
•Determined at 3:50 AM Mar 14th (Around Monitoring Post 6 )
•Determined at 4:15 AM Mar 14th (Around Monitoring Post 2 )
•Determined at 9:27 AM Mar 14th (Around Monitoring Post 3 )
•Determined at 9:37 PM Mar 14th (Around main entrance )
•Determined at 6:51 AM Mar 15th (Around main entrance )
•Determined at 8:11 AM Mar 15th (Around main entrance )
•Determined at 4:17 PM Mar 15th (Around main entrance )
•Determined at 11:05 PM Mar 15th (Around main entrance )

– The national government has instructed evacuation for those local
residents within 20km radius of the periphery and evacuation to inside
for those residents from 20km to 30km radius of the periphery, because
it’s possible that radioactive materials are discharged.
– At approximately 10AM on March 15, we observed 400mSv/h at the inland
side of the Unit 3 reactor building and 100mSv/h at the inland side of
the Unit 4 reactor building.
– We will continue to take all measures to ensure the safety and to
continue monitoring the surrounding environment aroud the Power Station.