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, we have compiled the roadmap towards restoration from the 
accident and then we updated the progress status of roadmap considering 
the current situation, on July 19. Accomplishment of the Step1 target 
"Radiation dose is in steady decline" has been confirmed. On November 17, 
we updated the further progress. 
By bringing the reactors and spent fuel pools to a stable cooling 
condition and mitigating the release of radioactive materials, we will 
make every effort to enable evacuees to return to their homes and for all 
citizens to be able to secure a sound life.

Below is the status of TEPCO's major facilities.

* Underlined are updates since the previous press release.

[Nuclear Power Station]

· Fukushima Daiichi Nuclear Power Station: Unit 1 to 3: shut down due to 
  the earthquake
  (Units 4 to 6: outage due to regular inspections)

  On November 24 and 26, we decreased the injection amount by the feed 
  water system to lower the hydrogen density of RPV by increasing the 
  temperature and the steam ratio thereby. After that ,we started 
  injection of nitrogen gas i into the reactor pressure vessel. (Unit 1 
  and 3; November 30, Unit 2; December 1)  As we assumed that the hydrogen 
  density of RPV was decreased from the result of the operation, we 
  increased the injection amount to the reactor of unit 1, 2 and 3 to cool 
  down the reactors more stably on December 10.
   Unit 1: At 10:09 am, we started water injection from the core spray 
           system addition to the water feeding system, 
           At 10:11 am, we adjusted the water injection volume of the core 
           spray system to approx 1.0m3/h
           (The current water injection volume is approx 4.2m3/h from the 
            water feeding system.)
   Unit 2: At 11:25 am, we adjusted the water injection volume of the core 
           spray system from approx. 4.5m3/h to approx. 5.5m3/h
           (The current water injection volume is approx 2.9m3/h from the 
            water feeding system.)
   Unit 3: At 11:25 am, we adjusted the water injection volume of the core 
           spray system from approx. 2.2m3/h to approx. 3.2m3/h
           (The current water injection volume is approx 6.0m3/h from the 
            core spray system)

· At 9:00 am on December 10, we started dust sampling above the reactor 
  building of Unit 3 with a large crane. At 10:30 am on the same day, we 
  finished the sampling.

· At 4:17 am on December. 7, on the alternative Spent Fuel Pool cooling 
  system of Unit 2, the alarm indicating that the difference of flow rates 
  between at the entering and at the exit of the primary pump is big went 
  off, and the system stopped automatically. At 4:41 on the same day, 
  after field investigation, no defect such as leakage was confirmed. 
  After that, as any troubles are not detected although we conducted 
  flushing of flow rate measure and detection line and filling water, the 
  cause of the alarm was not indentified. As temporary operation procedure 
  to identity the cause, we deleted the condition of automatic shutoff by 
  the alarm indicating that the difference of flow rates between at the 
  entering and at the exit of the primary pump is big. In addition, for 
  the alternative monitoring method, we strengthen monitoring of the water 
  level of skimmer surge tank and change the operation procedure to stop 
  the system manually when system troubles occurred. After that, at 11:37 
  am on December 10, we restarted cooling of the spent fuel pool by this 
  system. (Water temperature of spent fuel pool at the injection 
  restarted :31.3 °C)

· At 2:00 pm on December 10, we started transferring of accumulated water 
  from underground of the Turbine Building of Unit 1 to underground of the 
  Turbine Building of Unit 2.

· Fukushima Daini Nuclear Power Station:
  Units 1 to 4: shutdown due to the earthquake

· Kashiwazaki Kariwa Nuclear Power Station: Units 5, 6: under normal 
  operation
  (Units 1 to 4 and 7: outage due to regular inspections)

[Thermal Power Station]
- Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Hydro Power Station]
- Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Impacts on Transmission Facilities]
- Power supply has returned to normal and facilities damaged by the 
  earthquake are now being handled in a timely manner.

[Impacts on Power Supply and Demand Balance]
This winter, there will be some minus factors such as the regular 
inspection of Unit 5 at Kashiwazaki-Kariwa Nuclear Power Station. On the 
other hand, there will be several plus factors such as the recovery of the 
common thermal power stations which suffered the earthquake. As a result, 
we expect to secure 54.9 GW (at the end of December), 54.6 GW (at the end 
of January), 53.7 GW (at the end of February) supply power. 
Compared to the maximum demand in the last winter, which is 51.5 GW, we 
will have 2.2 - 3.4 GW generation reserve margin.

We expect to maintain stable power supply this winter, however, as there 
remains possibilities of unplanned shutdowns at our power stations and 
growth in the demand according to the rapid change in the temperature, we 
would like to ask your reasonable effort to save electricity.

We will continue to make our efforts to maintain stable operation and 
maintenance of the power facilities in order to "prevent in principle" the 
planned blackouts and secure power supply.

Appendix: Past Progress (As of 3:00 pm, December 10, 2011) (PDF 410KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress