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 10:15 AM on June 23, a worker of TEPCO confirmed that the water was flooding from the polyethylene tank which received the high pressure pump ground water for water treatment at the Desalination System 2 (Reverse Osmosis Membrane). The amount of flooded water was approx. 6.6 little. The water stayed in the dam, and did not leak outside the building. At 10:30 AM on the same day, we stopped the Desalination System 2 (Reverse Osmosis Membrane), and separated the pump. The dose measurement of the atmosphere and the dose at the surface near the puddle were below 0.1mSv/h as of both gamma ray and beta ray. The results of the flooded water sampling were as follows.

I-131: below the detection limit (detection limit : 7.0 x 10^-1 Bq/cm³)
Cs-134: 2.6 x 10⁰ Bq/cm³
Cs-137: 3.9 x 10⁰ Bq/cm³
All β: 9.0 x 10⁴ Bq/cm³

On July 13, we conducted the fix (part replacement) at the ground part of the pump and the test operation on the isolated system. Since we confirmed that there was no problem on the operating condition, we started full-scale operation.

-At 10:39 AM on July 14, we started transferring the accumulated water in Unit 1 Turbine Building basement to Unit 2 Turbine Building basement.

-At 4:03 PM on April 27, we started the operation of the desalting facility (a mobile RO facility) which was newly installed for desalting the Unit 4 reactor well and the spent fuel pool. Since we have been conducting the spent fuel pool desalting with this facility. Since the preparation at the reactor well was completed, we started the test operation on June 13. There was no problem on the operating condition, and we started the full-scale operation of the reactor well desalting by utilizing this facility. Hereafter, we will switch the desalting accordingly between the reactor well and the spent fuel pool depending on the situation of the concentration of salt, and we will continue desalting with this facility.

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

Appendix: Past Progress (As of 3:00 pm, on July 14, 2012) (PDF 456KB)
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.