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 9:55 am on December 20, as a restoration work for Unit 5 residual
   heat removal seawater system pump (B) was completed, we started a test
   operation, and at 11:22 am, a full-scale operation started after we
   confirmed its soundness. As a result, there came two (2) pumps, or (B)
   and (D). Although we stopped cooling down the reactor of Unit 5 by
   pausing the pump (B) from 9:39 am to 10:11 am, the reactor water
   temperature increase was 0.1°C and we made sure there was no security
   issues.
 * At 10:47 on December 20, we decreased the water injected from the feed
   water pipe from 3.9m3/h to 3.0m3/h, and increased the water injected
   from the reactor core spray system pipe from 5m3/h to 6m3/h.
 * On December 20, according to the operational record thus far, we
   changed the volume of nitrogen included into PCV and that of gas
   emitted from PCV gas control system. At 11:00 am on the same day, we
   decreased the reactor nitrogen amount from 28Nm3/h to 18Nm3/h, and at
   11:30 am, we increased the gas emission amount from 15Nm3/h to 30Nm3/h.

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

 * Among the seven monitoring posts that are temporarily placed at the
   border of the Power Plant, we started construction works of the
   structure to contain the measurement apparatus of No.7, in order to
   make this monitoring post permanent. The construction was scheduled to
   last from October 25 to December 20. On December 20 this structure was
   completed as scheduled and until December 21 this monitoring post will
   temporarily be out of order due to removal of detectors and other
   measurement apparatus, but the six other posts will continuously
   monitor the radioactive material in the air.

· 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 20, 2011) (PDF 236KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress