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 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".
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.

* Updates since the previous press release underlined.

[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 11:28 am on December 21, trial operation was conducted for Unit 5 
  residual heat removal system pump (A) which has been stopped due to the 
  tsunami on March 11. Because its soundness was confirmed, it was resumed 
  to be on stand-by at 12:49 pm. Reactor cooling was temporarily suspended 
  while switching pumps in trial operation, but there is no problem 
  regarding the cooling.

* At 1:57 pm on December 21, transfer of accumulated water was started from 
  Unit 2 turbine building to the Centralized Radiation Waste Treatment 
  Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building 
  [High temperature incinerator building] and Process Main Building).

* On December 21, regarding nitrogen injection to the PCV and gas exhaust 
  amount from the PCV gas controlling system, change in nitrogen injection 
  amount and gas exhaust amount from the gas controlling system was 
  conducted based on the past operation. At 2:52 pm on the same day, 
  injection of nitrogen to the PCV was adjusted from approx. 16 m3/h to 
  approx. 10 m3/h. At 3:15 pm. A gas exhaust amount from gas controlling 
  system was adjusted from approx. 40 m3/h to approx. 32 m3/h.

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

* At 10:15 am on 29th August, in order to investigate soundness of reactor 
  containment vessel of unit 4 and inside facilities, we have opened 
  airlock for site workers (hatch to enter into the primary containment 
  vessel), and we started investigation. On September 7, we implemented the 
  cleaning and decontamination. Since November 21, we had been conducted 
  the visual inspection of the reactor containment vessel and inside 
  facilities and finished the inspection today. In the result, there were 
  no reactor coolant leakages and no damages of facilities, equipments and 
  pipes. Therefore, we have confirmed that there are no harmful effects for 
  cold shutdown. Although there were some removal of paints of equipments 
  due to high temperature and humidity, we estimated it has no direct 
  impact on the cold shutdown. We will conduct detail inspection of the 
  reactor containment vessel including inside facilities.

· 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 3:30 am, December 21, 2011) (PDF 427KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress