Corporate Information

Press Release (Dec 10,2012)
Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 4:00 PM, December 10)

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 10:55 AM on December 10, a cooperative company employee on patrol found water leakage in the temporary warehouse of the desalination system (reverse osmosis membrane) 3. At 10:55 AM on the same day, the desalination system 3 was suspended and the leakage was confirmed to have stopped. The area affected by the leakage was approx. 4m x 8m x 3mm. The leaked water remains in the dam and has not flowed out of the temporary warehouse. The cause of the leakage is to be investigated. Since there is a sufficient amount of desalinated water, the incident will have no impact on reactor water injection.

- From 11:14 AM to 2:05 PM on December 10, Units 1-3 reactor water injection pump was switched from the regular reactor water injection pump on the hill to the reactor injection pump in the Turbine Building in order to prepare for newly building a shed for the regular reactor water injection pump on the hill which is scheduled from December 10 to 17. Since the target injection water amount at Unit 1 (total flow rate: 4.5m3/h) is the same as the lower limit flow rate of the reactor water injection pump in the Turbine Building (4.5m3/h) and the flow rate is difficult to adjust, Unit 1 reactor injection water amount was adjusted as follows to achieve the total reactor injection water amount of 5.0m3/h at 2:05 PM on the same day.
Feed water system: Increased from approx. 2.4m3/h to approx. 2.5m3/h, Reactor core spray system: Increased from approx. 1.9m3/h to approx. 2.5m3/h. Unit 2-3 reactor injection water amounts were adjusted as follows.
[Unit 2] Feed water system: Increased from approx. 1.8m3/h to approx. 2.1m3/h, Reactor core spray system: Maintained at approx. 4.0m3/h.
[Unit 3] Feed water system: Increased from approx. 1.7m3/h to approx. 2.0m3/h, Reactor core spray system: Decreased from approx. 4.1m3/h to approx. 4.0m3/h.

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

Appendix: Past Progress (As of 4:00 pm, on December 10, 2012) (PDF 617KB)
Appendix: Past Progress (From March 11, 2011 to December 31, 2011) (PDF 523KB)
* Revised past progress

The aforementioned attachments are only available in Japanese.
We apologize for any inconvenience this may cause.
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