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 4:15 PM on November 6, the reactor injection water amounts at Units 1-3 were adjusted as follows since the amounts had fluctuated.
[Unit 1] Feed water system: Increased from approx. 2.9m3/h to approx. 3.0m3/h, Reactor core spray system: Maintained at approx. 2.0m3/h.
[Unit 2] Feed water system: Increased from approx. 1.7m3/h to approx. 2.0m3/h, Reactor core spray system: Decreased from approx. 4.7m3/h to approx. 4.5m3/h.
[Unit 3] Feed water system: Increased from approx.1.5m3/h to approx. 2.0m3/h, Reactor core spray system: Decreased from approx. 4.6 m3/h to approx. 4.5m3/h.
-At 2:09 PM on November 5, Unit 4 spent fuel pool alternative cooling system was stopped for adding anti-freeze liquid into the secondary system circulation water to prevent the water from freezing during winter time (The pool water temperature when the system was stopped: approx. 24.0°C). At 4:35 PM on November 6, cooling of the spent fuel pool was restarted after the work was completed and no problem was found with the system operation. Though the spent fuel pool water temperature increased from 24.0°C (temperature when the system was stopped) to 31.0°C, there is no problem with the pool water temperature control considering that there is a sufficient margin to the maximum allowed temperature (65°C).
-At 9:42 AM on November 7, the common pool cooling purification system was stopped in order to connect the control cables of the common pool cooling purification system pump A and the common pool component cooling system pump A (The pool water temperature when the system was stopped: 22.4°C). At 11:23 AM on the same day, the common pool cooling purification system was restarted after the work was completed and no problem was found with its operation. Though the common pool water temperature increased from 22.4°C (temperature when the system was stopped) to 22.7°C, there is no problem with the pool water temperature control considering that there is a sufficient margin to the maximum allowed temperature (65°C).
-At 2:30 PM on November 7, the reactor injection water amount at Unit 2 was adjusted as follows since the amount had decreased. Feed water system: Increased from approx. 1.8m3/h to approx. 2.0m3/h, Reactor core spray system: Increased from approx. 4.3 m3/h to approx. 4.5m3/h.
-On November 7, dust sampling was conducted at the opening (blow-out panel) of Unit 2 Reactor Building.
-On November 7, sampling was conducted at the charcoal filter and the particulate filter of Unit 2 PCV gas control system
[Fukushima Daini Nuclear Power Station]
・Unit 1 to 4: Shutdown due to the earthquake.
Appendix:
Past Progress (As of 3:00 pm, on November 7, 2012) (PDF 581KB)
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.
