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 3:42 PM on November 1, the reactor injection water amounts at Units 1-3 were adjusted as follows since the amounts had decreased.
[Unit 1] Feed water system: Increased from approx. 2.6m³/h to approx. 3.0m³/h, Reactor core spray system: Increased from approx. 1.9m³/h to approx. 2.0m³/h.
[Unit 2] Feed water system: Increased from approx. 1.9m³/h to approx. 2.0m³/h, Reactor core spray system: Increased from approx. 4.2m³/h to approx. 4.5m³/h.
[Unit 3] Feed water system: Increased from approx.1.6m³/h to approx. 2.0m³/h, Reactor core spray system: Maintained at approx. 4.5m³/h.

- At 6:40 AM on November 2, the reactor injection water amounts at Units 2-3 were adjusted as follows since the amounts had fluctuated.
[Unit 2] Feed water system: Increased from approx. 1.6m³/h to approx. 2.0m³/h, Reactor core spray system: Decreased from approx. 4.8m³/h to approx. 4.5m³/h.
[Unit 3] Feed water system: Increased from approx.1.6m³/h to approx. 2.0m³/h, Reactor core spray system: Decreased from approx. 4.7m³/h to approx. 4.5m³/h.

- On November 2, the nitrogen injection into Unit 1 PCV and suppression chamber was temporarily suspended while switching the power supply and was restarted afterwards. The nitrogen injection was suspended during the period from 9:18 to 9:46 AM on the same day for PCV and from 9:02 to 9:52 AM for the suppression chamber. The nitrogen injection into the RPV was never suspended.

- At 10:09 AM on October 30, we started transferring the accumulated water in Unit 2 Turbine Building basement to Unit 3 Turbine Building basement. At 9:23 AM on November 2, the transfer was stopped.

- At 12:18 PM on October 26, we started transferring the accumulated water from Unit 3 Turbine Building basement to the Central Radioactive Waste Treatment Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building [High Temperature Incinerator Building]). At 9:33 AM on November 2, the transfer was stopped. At 2:17 PM on the same day, the transfer was restarted.

- At around 9:25 AM on November 2, 2012, an alarm indicating a power system abnormality ("Common M/C^*11A generating line ground fault" and "Common M/C2A generating line ground fault") went off. At around 10:00 AM, it was found that the power cable connecting Common M/C1A and Common M/C2A was damaged during operation as a result of site investigation. Since smoke was coming out from the damaged portion of the cable, the incident was reported to the fire department at 10:25 AM. As the power supply to the damaged cable was stopped at 10:49 AM, the smoke stopped coming out at 10:51 AM. From 11:00 to 11:23 AM on the same day, power receiving at Common M/C1A was restarted and the related equipments^*2 were turned back on sequentially. As a result, no problem was found with the operation of the equipments after being restarted. At 11:38 AM, it was confirmed that no problem was found with Units 1-4 plant facilities, accumulated water transfer facility, water treatment facility, common pool facility and Units 5-6 plant facilities. Upon site investigation, the fire department judged that the incident was not a fire at 1:37 PM on the same day. There was no injury due to the incident, and so far no significant change has been found with the monitoring post data and the plant conditions. The cause is currently being investigated.
*1 M/C: Power panel
*2 The nitrogen gas separator A (which receive power from Common M/C1A) and the nitrogen injection into Unit 1 PCV and Unit 1 suppression chamber were temporarily suspended as the power receiving at Common M/C1A was stopped.

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

Appendix: Past Progress (As of 3:00 pm, on November 2, 2012) (PDF 575KB)
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.