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 6:27 PM on November 20, the reactor injection water amount at Unit 1 was changed as follows since the amount had fluctuated. Feed water system: Increased from approx. 2.2m³/h to approx. 2.5m³/h, Reactor core spray system: Maintained at approx. 2.0m³/h.

- At 10:06 AM on November 18, we started transferring the accumulated water in Unit 2 Turbine Building basement to Unit 3 Turbine Building basement. At 9:25 AM on November 21, the transfer was stopped.

- At 9:47 AM on November 21, Unit 6 spent fuel pool cooling system was stopped for repairing the strainer changeover valve of the component seawater system (the pool water temperature when the system was stopped: 18.8℃). While the system is suspended, cooling will be continued through alternating operation between the shutdown cooling system (for cooling the reactor) and the emergency heat load operation (for cooling the spent fuel pool) of the residual heat removal system. However, since the shutdown cooling system will be switched from A to B during the period from November 21 to 23, the emergency heat load operation will start on November 23 or later. Although cooling of the spent fuel pool will be suspended for about 3 days, there will be no problem with the spent fuel pool water temperature control since the pool water temperature increase rate is 0.2℃/h and the temperature increase is estimated to be approx. 11℃, which leaves a sufficient margin to the maximum allowed temperature (65℃) which is stipulated in the technical specification.

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

- On November 14, an investigation of the suppression chamber utilizing an underwater camera was started to prepare for an inspection of Unit 4 suppression chamber (planned in January 2013). The investigation was completed on November 20, and no problem was found as a result. An inspection of the inside of the suppression chamber by a diver is planned to be performed.

Appendix: Past Progress (As of 3:00 pm, on November 21, 2012) (PDF 599KB)
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.