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 3:36 PM on October 9, Unit 2-3 reactor injection amounts were changed as follows in order to reduce the load on the water treatment facility considering that there is a sufficient margin to the decay heat equivalent water injection amounts.
[Unit 2] Feed water system: Maintained at approx. 2.0m3/h, Reactor core spray system: Decreased from approx. 4.9m3/h to approx. 4.5m3/h.
[Unit 3] Feed water system: Decreased from approx. 2.4m3/h to 2.0m3/h, Reactor core spray system: Maintained at approx. 4.5m3/h.
Unit 1 reactor injection amount was adjusted as follows since the amount had decreased.
[Unit 1] Feed water system: Increased from approx. 2.8m3/h to 3.0m3/h, Reactor core spray system: Maintained at approx. 2.0m3/h.
-On October 10, during a regular inspection of Unit 5 reactor core spray system (B), one of the two valving elements was found to be removed when the minimum flow rate bypass valve was opened for inspection. The cause of this incident will be investigated. At a regular testing of the reactor core spray system (B) performed on July 18, the minimum flow rate bypass valve did not close all the way (stopped at 22% open) though it should have during "manual operation of electric valve" test. However, the flow rate at the reactor core spray pump was 1078m3/h and the total pump head was 191m which fulfilled the requirement stipulated in Article 39 of the technical specification (flow rate: 1073m3/h or more, total pump head: 191m or more).
[ Fukushima Daini Nuclear Power Station ]
・Unit 1 to 4: Shutdown due to the earthquake.
Past Progress (As of 3:00 pm, on October 10, 2012) (PDF 554KB)
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.