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 10:10 AM on December 4, we started transferring the accumulated water in Unit 3 Turbine Building basement to the Central Radioactive Waste Treatment Facility (Process Main Building). At 8:14 AM on December 6, the transfer was stopped.
- At 8:31 AM on December 6, Unit 5 residual heat removal system (A) was suspended since all the residual heat removal system seawater pumps need to be temporarily suspended in order to connect the residual heat removal system seawater pump (C) to the system (which had been inspected and repaired after the flow rate decrease was found) (the reactor water temperature when the residual heat removal system (A) was stopped: 32.7℃). At 11:48 AM on the same day, the residual heat removal system (A) was restarted (the reactor water temperature when it was restarted: 34.4℃). There is no problem with the reactor water temperature control considering the sufficient margin to the maximum allowed temperature (100℃).
- At 11:12 AM on December 6, nitrogen injection into Unit 1 PCV was suspended since the common M/C1A needed to be suspended for recovery work (connecting the cable) for the common M/C1A-2A interconnected line cable damage occurred on November 2. At 11:39 AM on the same day, nitrogen injection was restarted. Nitrogen gas injection into Unit 1 RPV was continued while the injection into PCV was suspended.
- On December 6, sampling was conducted at the charcoal filter and the particulate filter of Unit 3 PCV gas control system
- On December 6, dust sampling was conducted in the upper part of Unit 3 Reactor Building.
[Fukushima Daini Nuclear Power Station]
· Unit 1 to 4: Shutdown due to the earthquake.
Past Progress (As of 3:00 pm, on December 6, 2012) (PDF 616KB)
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.