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 10:00 AM on June 29, we started transferring the accumulated water in Unit 6 Turbine Building basement to the temporary tank. At 4:00 PM on the same day, we stopped transferring.

-At 5:16 PM on June 29, we started transferring the accumulated water in Unit 1 Turbine Building basement to Unit 2 Turbine Building basement.

-At 9:54 AM on June 18, Unit 5 Equipment Cooling Seawater System was stopped due to the fix of the strainer drive from June 18 to June 29,^*Since Spent Fuel Pool cooling was stopped, cooling at Spent Fuel Pool will be conducted by the residual heat removal system during this period. At 10:34 PM on June 29, we restarted cooling by Equipment Cooling Seawater System since the fix of the strainer drive was completed. (water temperature of spent fuel pool was 29.0 ℃ at the time of starting)
*Though it was scheduled to end on June 28 initially, postponed to June 29.

-On October 24, oil film was found on the accumulated water in the oil retaining wall of temporary oil tank for main transformer in the power plant premise (Wild Bird Forest).Later, since the water level fell in the retaining oil wall due to waste-water treatment and oil absorption treatment, as checking the status of the submerged tank, on June 25 2012, we found oil leak from the bottom of the oil gage of one of 9 tanks and oil level falling of other 4 tanks. Currently no oil leaks as the valve of the oil gage is closed, leaked oil accumulates in the retaining oil wall. The estimated amount of the oil that has leaked from the tank since we found the oil film on the surface of accumulated water in the retaining oil wall is approx.39kl. Oil leaks from other places are under investigation as well.

-Around 6:24 AM June 30, at Unit 4, alarm went off relating to abnormality of spent fuel pool alternative cooling system and the system stopped automatically. We confirmed nothing leaked at the site. We estimated that the water temperature of the spent fuel pool of Unit 4 at the time when the system stopped was approx.31 ℃ and the temperature rising rate was 0.486 ℃/h. The cause for the system suspension is under investigation .

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

Appendix: Past Progress (As of 3:00 pm, on June 30, 2012) (PDF 437KB)
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.