http://www.tepco.co.jp/en/press/corp-com/release/11031710-e.htmlPress Release (Mar 17,2011)
Plant Status of Fukushima Daiichi Nuclear Power Station (as of 0:00 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 and currently under the investigation.
- 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, reactor pressure has
increased because the system stopped, causing reactor water level
to drop. Following the instruction by the government and with fully
securing safety, measure to lower the pressure level within the reactor
containment vessel and injection of sea water were taken, reactor
pressure and water level resumed.
- We are continuing the injection of sea water into the reactor.
- At approximately 6:00am, an abnormal noise began emanating from nearby
Pressure Suppression Chamber and the pressure within this chamber
decreased.
- While we continue sea water injection operations, the temporary transfer
of TEPCO employees and workers from other companies not directly
involved in this work has begun.
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 and currently under the investigation.
- We confirmed fog like steam from reactor building at 8:30AM on March 16th.
- As it was reported that the pressure of the Suppression Chamber
temporally increased at around 6:15AM on March 17th, we will continue
monitoring.
- In order to cool spent fuel pool of Unit 3 we conducted water spray by
helicopters of Self-Defense Force at approximately 9:48 am. We are
continuously monitoring the spent fuel pool and plan to conduct water
spray to other Units.
- We have been injecting sea water into the reactor pressure vessel.
Unit 4 (shut down due to regular inspection)
- Reactor has been shut down. However, we have confirmed the sustained
damage around the 5th floor rooftop area of the Nuclear Reactor
Building.
- Afterwards, we confirmed the outbreak of fire at the northwestern part
of Nuclear Reactor Building. We immediately reported this matter to the
fire department and the related authorities.
- However, at approximately 11:00am, when TEPCO employee arrived at the
seen to confirm, the fire had already died down. At 5:45AM on March
16th, we confirmed the outbreak of the fire again but could not confirm
it at 6:15AM. We will continue to monitor the situation carefully.
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.
- 11 workers were injured and transported to Fukushima Daini Nuclear Power
Station after explosive sound and white smoke were confirmed around
the Unit 3.One of the injured workers got medical treatment on March
16th, but the worker reported a flank pain. We re quired to
the offsite center that the worker should be transported to
the hospital. After that, the helicopter of JSDF arrived and
transported the worker to the FUKUSHIMA Medical University Hospital
at 10:56AM
- Presence of 2 TEPCO employees at the site is 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 of the plant.
- We measured radioactive materials 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(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 )
- We will continue to make announcements when it was determined that
a specific incident stipulated in article 15, clause 1 has occurred.
- 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.
- Today, at approximately 10am, 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 restore the security of
the site and to monitor the environment of the site periphery.
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