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 April 26, we started transferring the accumulated water from the basement of T/B of Unit 6 to the temporary tanks. At 4:00 pm on the same day, we stopped transferring. At 10:00 am on April 27, we restarted transferring.

* At 2:42 pm on April 26, we started hydrazine injection into the Unit 4 spent fuel pool through the circulating cooling system. At 4:15 pm on the same day, we stopped the injection.

* At 8:33 on April 27, we temporarily stopped the 2nd Cesium Adsorption Apparatus (Sarry) for back washing the filter as we had confirmed tendency of decrease in the amount of water flow. At 0:42 pm on the same day, we restarted the device and the amount of water flow reached in stable flow (Approx. 40 m³/h) .

* At 9:17 am on April 27, a worker of partner company found water leakage at water desalinations (RO) No2(When it was found, we estimated that the leaked water is 18 litters in total. ) At 9:30 am of the same day, we stopped the device. To prevent the leaked water to drop on the floor, we cured entry side of water joint of piping of the device, where the leakage occurred, with plastic bag. Then, we closed valves near leaked point, and confirmed no further leakage at 10:19 am of the same day. The amount of leaked water in total is 36 litters and all of them is pooled at the device, and so there is no leakage out side of the building. The radiation dose of dropped water is 7mSv/h, γ is about 1mSv/h. The sampling result of leaked water is I-131: Below Limit of Detection, Cs-134: 1.5 X 10⁰Bq/cm³. Cs-137: 2.1 X 10⁰Bq/cm³, Allγ: 4.9 X 10¹Bq/cm³, Allβ: 5.4 X 10⁴Bq/cm³. As there are enough treated water, and also other water desalinations are in operation, there is no influence for injecting water to reactors.

* At 2:49 pm on April 27, we started transferring the accumulated water from the basement of T/B of Unit 1 to the basement of T/B of Unit 2.

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

Appendix: Past Progress (As of 3:00 pm, on April 27, 2012) (PDF 305KB)
Appendix: Past Progress (From March 11, 2011 to December 31, 2011) (PDF 460KB)
* Revised past progress