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.

* 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 3:48 pm on December 11, we confirmed that the water was accumulated
   inside the gate in the house the water desalination apparatus
   (evaporative concentration apparatus) 2 was installed. Leaked water is
   approx. 5 litters, kept within the gate. We also confirmed that the
   leakage has been stopped, and that it was leaked from a ventilation
   pipe at the tank storing the seal water for the evaporative
   concentration apparatus 2B. The source of the water is the filtered
   water (fresh water), and the radiation doses of the surface near the
   leaked water are 0.12 mSv/h (gamma ray), and less than 1 mSv/h
   (beta ray), which are the same level as the airborne radiation doses
   nearby. We will investigate the cause. Desalination apparatus (reverse
   osmosis membrane apparatus) 2-1 and 2-2 are continuously working, which
   generate the sufficient desalinated water, therefore, there is no
   impact on the water injection to the reactors. At approx. 11:00 am on
   December 12, we confirmed that the remaining water in the hose was
   oozing from the leakage point (the leakage amount is about 1 drop in 3
   seconds). Later we removed the water from the tank for the seal water
   and from the hose. At approx. 3:00 pm on the same day, we confirmed
   that the water ceased to ooze.

 * At 2:00 pm on December 10, We started to transfer the water accumulated
   in the basement of Unit 1 Turbine Building to the basement of Unit 2
   Turbine Building. At 9:22 am on December 12, we stopped the transfer.

 * When we cut the power of the PCV gas control system (Line A: under
   suspension) of Unit 1 to switch the power source for the improvement
   work of the on-site power source at approx. 10:38 am on December 12,
   the monitoring system in the main anti-earthquake building for the same
   system (Line B: under commissioning) was stopped. At approx. 11:30 am,
   we confirmed on site that the system (Line B) was stopped. Later, it
   was revealed that the power for controlling Line B comes from Line A,
   therefore we switched the power for the control, then at 12:00 pm we
   resumed Line B. Since Line B is normally operating after the re-start,
   we estimate that the reason Line B went down is that the power for Line
   A was cut.

· 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 12, 2011) (PDF 392KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress