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 10:01 AM on September 18, we started transferring the accumulated water in Unit 4 Turbine Building basement to the Central Radioactive Waste Treatment Facility (Process Main Building). At 10:00 AM on September 22, the transfer was stopped.

-At 10:40 AM on September 19, we started transferring the accumulated water in Unit 2 Turbine Building basement to Unit 3 Turbine Building basement. At 10:06 AM on September 22, the transfer was stopped.

-The desalination system (mobile RO system) which was being used in Unit 4 was moved to Unit 3 and started operation at 10:18 AM on September 22.

-As for Skid 3 of the desalination system (reverse osmosis membrane) 3 where a water leakage from the pipe joint area at the high pressure pump outlet was found on September 15, the pump was disassembled for inspection and the parts installed at the leakage location were replaced. As no problem was found then, the desalination system 3 (Skid 3 and 4) restarted operation at 10:20 AM on September 22. At 10:25 AM on the same day, the desalination system 2 (Skid 5) which was in operation was stopped. The desalination system (reverse osmosis membrane) will intermittently operate while taking into consideration the water balance.

-At around 11:07 AM on September 22, during debris removal from the upper part of Unit 3 Reactor Building, a steel beam (Approx. 300mmx200mmx7m, Approx. 470kg) which had been on the side of the spent fuel pool (SFP) slipped and fell into the pool when a worker was trying to grab it using an oil-pressure fork attached to the head of the crane. At around 11:45 AM on the same day, it was confirmed that there was no problem with the operation status of the spent fuel pool alternative cooling system and the skimmer surge water level. No significant change was found in the monitoring post data, the atmosphere dose rate around the spent fuel pool and the spent fuel water level. The nuclide analysis results of the spent fuel pool water were as follows.
Cesium 134: 2.2x10³Bq/cm³, Cesium 137: 3.6x10³Bq/cm³, Iodine 131: Below the detection limit (1.4x10¹Bq/cm³)
The most recent nuclide analysis results before the incident (sampled on September 21) were as follows.
Cesium 134: 2.4x10³Bq/cm³, Cesium 137: 4.0x10³Bq/cm³, Iodine 131: Below the detection limit (3.4x10¹Bq/cm³)
There is no significant difference between these two sets of results. No injury was reported due to this matter.

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

 

Appendix: Past Progress (As of 3:00 pm, on September 22, 2012) (PDF 535KB)
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.