Press Releases 2013

Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March 11, 2011, TEPCO's facilities including our nuclear power stations have been severely damaged. We deeply apologize for the anxiety and inconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on April 17, 2011, we have compiled the roadmap towards restoration from the accident and on July 19 we accomplished the Step1 target "Radiation dose is in steady decline". Then on December 16 we confirmed the accomplishment of the Step 2 target "Release of radioactive materials is under control and radiation doses are being significantly held down".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units 1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will implement Mid-to-Long Term countermeasures towards the decommissioning of Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to their homes as soon as possible and reduce the anxiety of the people in Fukushima and the whole nation as soon as possible.

Below is the status of TEPCO's nuclear power stations (Fukushima Daiichi and Fukushima Daini).

* The updates are underlined.

[Fukushima Daiichi Nuclear Power Station]
･ Unit 1 to 4: Abolishment (April 19, 2012)
･ Unit 5 to 6: Outage due to regular inspections before the earthquake

- At 6:58 AM on January 28, Unit 3 spent fuel pool alternative cooling primary system was suspended in order to remove a steel beam interfering with the removal of steel beam truss debris (Pool water temperature when the system was suspended: Approx. 9.1℃). The system will be suspended until February 1 and the pool water temperature increase rate is estimated to be approx. 0.16℃/h. There is no problem with the pool water temperature control considering that there is a sufficient margin to the maximum allowed temperature (65℃). The spent fuel pool alternative cooling system will be put in operation during the night as debris removal will not be done at night.

- At 9:48 AM on January 28, as part of restoration of Unit 1 condensate water storage tank, we started transferring the water stored in the tank to Unit 1 Waste Treatment Building.

- As for Units 5 and 6 where the building and the outdoor trench were flooded due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake, we have been transferring the accumulated water in the building in order to prevent water level increase in the building. On January 28, we started transferring the accumulated water in the outdoor trench of the emergency gas treatment system^*1 to the temporary tank for the purpose of further enhancing safety. The transfer will be performed as necessary until early February.
*1 System comprised of two lines which purifies the air in the Reactor Building utilizing high performance filter and discharges it from the exhaust stack.

- At 12:10 PM on January 28, the air fin cooler of the common pool cooling purification system (A system) secondary system was suspended in order to stop the main line of the common D/G (A) M/C. At 1:05 PM on the same day, the air fin cooler was restarted after the work was done. No problem was found with the operation of the cooling system after it was restarted. Though the common pool water temperature increased from approx. 11.5℃ (when cooling was suspended) to approx. 12.4℃, there is no problem with the pool water temperature control considering that there is a sufficient margin to the maximum allowed temperature (65℃).

[Fukushima Daini Nuclear Power Station]
･ Unit 1 to 4: Shutdown due to the earthquake.

- At around 10:29 AM on January 28, a cooperative company worker who was repairing cable in the high voltage power supply facility switchboard room (controlled area^*2) in the basement of Unit 1 Reactor Building Annex fell off a stool (height: approx. 0.9m) and injured his left elbow. Upon judgment of a doctor at the medical clinic, an ambulance was called at 10:55 AM. The worker is conscious and has no radioactive material attached on his body. The worker was later transported to Fukushima Accident Hospital.
*2 Radiation controlled area where the expansion of radioactive contamination is prevented for the purpose of limiting unnecessary radiation among workers.

 

* Revised past progress

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