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 10:00 am on December 1, we started the transfer of the accumulated
 water from the basement of the Unit 6 turbine building to the temporary
 tank.

*At 1:45 pm on November 30, we started nitrogen injection into the Reactor
 Pressure Vessel of Unit 2. At 2:47 pm, the operation was suspended as it
 was observed that nitrogen inflow did not increase. The inspection
 thereafter revealed that the valve which was not described in the
 operation manual was not open. At 10:46 am on December 1, we restarted
 the injection operation. At 11:00 am, injection amount reached the
 scheduled amount of 5 m3/h. Along with this operation, in order to
 balance the injected amount of nitrogen into the Reactor Pressure Vessel
 and the Primary Containment Vessel of Unit 2 and the exhaust amount from
 the gas management system, the exhaust amount from the system was
 adjusted from approx. 22 m3/h to approx. 34 m3/h

*At 1:21 pm on December 1, we started injection of hydrazine into spent
 fuel pool of unit 3 by using circulating cooling system and stopped such
 injection at 2:56 pm.

*At 11:13 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 23.8 °C and
 the anticipated temperature increase was 0.3 °C/h. As there is sufficient
 buffer, the inspection was 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. We expect no major issue for the continued
 system outage as the temperature of spent fuel pool was 23.8 °Cthe at
 1:00 pm on December 1 (1.1°C increase from 11:00 pm on November 30) and
 the increase is not material.

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

*At 2:08 pm on December 1, Residual Heat Removal System (A) in Unit 3 was
 stopped in order to switch operation from system (A) to (B). At 2:19 pm,
 System (B) was activated.

· 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 1, 2011) (PDF 187KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress