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 from 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)

 *At 9:01 am on December 2, we interrupted the operation of the 
  alternative cooling in order to replace the inside mesh of the primary 
  strainer as a countermeasure against the decrease in inhale pressure of 
  the primary pump for alternative cooling of the spent fuel pool. The 
  temperature of the spent fuel pool as at the interruption was 18°C and 
  expected temperature increase was 0.2°C/h (duration of interruption: 
  approx. 3hours). The water temperature of the spent fuel pool is in a 
  normal state.

 *At 10:25 am on December 2, we adjusted the volume of nitrogen injected 
  into the Reactor Pressure Vessel from approx. 5m3/h to approx. 10m3/h. 
  In addition, in order to balance the volume of nitrogen injected into 
  the Reactor Pressure Vessel and the Primary Containment Vessel of Unit 2 
  and the volume of exhaust air from gas control system, we adjusted the 
  volume of exhaust air from gas control system of the Primary Containment 
  Vessel from approx. 34m3/h to approx. 39m3/h.

 *At 10:35 am on December 2, we adjusted water injection volume from 
  approx. 4.0m3/h to approx. 4.5m3/h since decrease in injection volume 
  was observed.

 *From 12 pm to 2 pm on December 2, we conducted dust sampling at the 
  opening of Unit 2 reactor building (blow-out panel).

 *At 11:13 pm on November 30, the alarm went off at the alternative 
  cooling system in the Fuel Pool Cooling and Filtering System indicating 
  that the difference of the flow rate between at the inlet and at the 
  outlet is large and the system automatically stopped its operation. At 
  11:34 pm on the same day, no leakage was confirmed by the site 
  inspection. At 11:00 pm on the same day, the temperature of spent fuel 
  pool was 22.7 °C and the anticipated temperature increase was 0.3 °C/h. As 
  there is sufficient buffer, the inspection is scheduled during the 
  morning of December 1. However, the inspection, the repair work and the 
  cause analysis is rescheduled to December 2 as it turned out that the 
  material preparation for such work needs time. On December 2, it was 
  estimated that air or foreign materials entered the detection line. We 
  conducted flushing and fulfilled it with clean water and restarted 
  cooling the spent fuel pool at 1:50pm on the same day. (As at restart 
  temperature of water was 28.0°C.)

 *From 10:10 am to 12 pm on December 2, we conducted dust sampling at the 
  ventilation equipment filter of Unit 1 reactor building cover.

 *From 1 pm to 2 pm on December 2, we conducted dust sampling and measured 
  air flow at the upper part of the reactor building equipment hatch of 
  Unit 1.

 *From 11 am to 1 pm on December 2, we confirmed leakage at 7 points in 
  the hose which was used for the water transfer from the desalination 
  facility to the buffer tank (the leakage was at one or two drops per 
  second.). Then we made a tentative repair with water stopping tape and 
  confirmed that the leakage stopped. Since the leaked water was one 
  treated through decontamination and desalination process and the leaked 
  amount was so little, there will be no impact on the environment.

 *On December 2, we conducted sampling at charcoal filter and particulate 
  filter of gas control system of Unit 2 Primary Containment Vessel.

·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 2, 2011) (PDF 375KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress