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)

  * Since the monitoring results of the decontamination of radioactivity 
    material and hydrogen density at the Primary Containment Vessel (PCV) 
    gas controlling system which was in a test run was stable, we started 
    regular operation of this system at 6:00 pm of December 19.
  * On December 19 an employee of TEPCO who engaged in repair works at 
    Fukushima Daiichi Stabilizing centre was diagnosed as infected by Noro 
    virus. Other than the two workers (including the employee mentioned 
    above) that were diagnosed as infected by Noro virus so far, another 
    TEPCO employee who engaged in works at the Fukushima Daiichi Power 
    Plant was diagnosed as Gastroenteritis caused by a virus. We 
    disinfected the working office of the two TEPCO employees. We plan to 
    inform persons/parties concerned of fundamental matters such as strict 
    enforcement of washing hands and gargling, re-enforcement of 
    disinfecting ways in case of onset, a medical team responding system 
    etc.
  * At 3:06 am on December 19 and 5:04 am on December 20, the alarm went 
    off which showed that the flow rates at the inlet and the outlet of 
    the primary system pump of The spent fuel pool alternative cooling 
    system of unit 2 was substantially different. We confirmed the site 
    and recognized no leak of water. Later we implemented a vibration 
    experiment on the instrumentation piping and confirmed that the alarm 
    had stopped. The spent fuel pool alternative cooling system is in 
    normal operation.
  * At 8:58 am on December 20 we stopped the Cesium adsorption apparatus 
    in order to adjust the water level of each turbine building and the 
    Centralized Radiation Waste Treatment Facility (Miscellaneous Solid 
    Waste compressing building [high temperature incinerator building] and 
    Process Main Building). The water injection is not affected since 
    water is injected to the reactor from the buffer tank which consists 
    of desalinated water.

· 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 9:00 am, December 20, 2011) (PDF 420KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress