Corporate Information

Press Release (Jul 01,2012)
Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 3:30 PM, July 1)

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

-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. As a result of the investigation on the same day, we assumed that there was a trouble with UPS (Uninterruptible power supply system). So, at 1:35PM July 1, we started by-pass working for the UPS which was assumed to have a problem and completed working at 2:45PM on the same day. At 3:07PM on the same day, spent fuel pool alternative cooling system was started and cooling was restarted. The water temperature of spent fuel pool was 42.9℃ when restarting to cool ( figure indicated by a temporary thermometer ). After this we will replace problematic UPSs.

-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 9:57AM on July 1, we stopped transferring.

-At 3:12PM on June 16, accumulated water transferring from Unit 2 Building basement to the Central Radioactive Waste Treatment Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building [High Temperature Incinerator Building] was started. At 10:11AM on July 1, transferring was stopped.

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

Appendix: Past Progress (As of 3:30 pm, on July 1, 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.
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