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 around 10:16 AM on August 17, a worker from cooperative company on patrol found water leakage at the desalination apparatus (Reverse Osmosis Membrane) 3. The apparatus was stopped manually at 10:17 AM, and at stop of the leakage was confirmed 10:22AM. The leakage location was confirmed to be the joint of the suction side of the booster pump inside skid 3 of the apparatus. We estimated that the leakage amount is approx. 0.2m³, and the leaked water is the water before the process of desalination. The surface radiation dose rate was 0.1mSv/h (γ rays) and 3mSv/h (β rays). The water leak has occurred inside the dam and has not flooded out. The result of nuclide analysis of leaked water is as below.

Iodine 131: Below the detection limit
Cesium 134: 4.2 x 10⁰ Bq/cm³
Cesium 137: 7.2 x 10⁰ Bq/cm³
All β: 7.1 x 10⁴ Bq/cm³

And the result of remeasurement of surface dose rate at the sampling points is as below.

γ ray: 0.028 mSv/h
β ray: 5 mSv/h.

We swept the leaked place and inspected similar points. Since we confirmed that there was no abnormality, we started up skid 4 of the desalination apparatus (Reverse Osmosis Membrane) 3 at 12:20 PM on August 18 and skid 1 of the apparatus 1 (A/B) at 1:00 PM. As for this apparatus, we will operate intermittently in consideration of water balance.

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

Appendix: Past Progress (As of 3:00 pm, on August 18, 2012) (PDF 491KB)
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.