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Corporate Information

 
Press 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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