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).
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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
-As for the hole drilled on the ceiling of Unit 6 Reactor Building on March 18, 2011 for the purpose of preventing hydrogen explosion, considering that cold shutdown is being maintained and the plant condition has been stable at Unit 6, work to close the hole has been started on March 8 in order to maintain the air tightness of the building. On March 11, the work has been completed.
As a result of air tightness confirmation performed from 1:51 PM to 2:23 PM on March 17, no problem was found.
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At 6:35 AM on March 18, Unit 2 spent fuel pool alternative cooling system was suspended for power supply multiplication work (The pool water temperature when the system was suspended: Approx. 15.0 °C). The pool water temperature increase rate during the cooling suspension is approx. 0.19 °C/h and the amount of pool water temperature increase during suspension is estimated to be approx. 2.3°C. There is no problem with the spent fuel pool water temperature control considering that there is a sufficient margin to the maximum allowed temperature (65°C).
-As a result of putting the desalination system in operation since April 11, 2012 to prevent mid-term corrosion and damage of the structures in Unit 3 spent fuel pool,
the chloride concentration of the spent fuel pool was confirmed to have reduced from approx. 1,600ppm (concentration when the desalination system was first put in operation) to approx. 5ppm on March 18, 2013. Thus, desalting at Unit 3 has been completed.
[Fukushima Daini Nuclear Power Station]
· Unit 1 to 4: Shutdown due to the earthquake.
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Revised past progressThe aforementioned attachments are only available in Japanese.
We apologize for any inconvenience this may cause.
