Press Releases 2013

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 6:54 AM on February 16, Unit 4 spent fuel pool alternative cooling system was suspended for inspection and modification of the power supply equipment (Pool water temperature when the system was suspended: 22.0℃). At 3:34 PM on the same day, the cooling of the spent fuel pool was restarted after the work was completed and no problem was found with its operation. Though the spent fuel pool water temperature has increased from 22.0℃ (when the cooling was suspended) to 23.0℃, there is no problem with the pool water temperature control considering the sufficient margin to the maximum allowed temperature (65℃).

- At around 7:36 PM on February 16, a cooperative company worker found water overflowing from the water intake tank between the temporary tank storing accumulated water installed outside of Units 5-6 and the desalination system (reverse osmosis membrane). The leaked stopped after stopping the water intake pump on the upstream side of the water intake tank. The amount of leaked water is evaluated to be approx. 19.8m3 and the leaked water has been absorbed into the ground. We have judged that the leaked water has not flowed to the outside considering that there is no side ditch, etc. in the surrounding area. The cause of the leakage is currently under investigation. The radioactivity density analysis results of the leaked water are as follows.
Cesium 134: 6.8×10^-2Bq/cm³
Cesium 137: 1.3×10^-1Bq/cm³
All γ: 2.0×10^-1Bq/cm³

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

* Revised past progress

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