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".
In addition, on December 21, we have compiled the "Mid-and-long-Term 
Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units 
1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will 
implement Mid-to-Long Term countermeasures towards the decommissioning of 
Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to 
their homes as soon as possible and reduce the anxiety of the people in 
Fukushima and the whole nation as soon as possible.

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 1:30 pm on December 22, we started to inject hydrazine into Unit 3 
  spent fuel pool using circulating cooling system. At 3:15 pm on the same 
  day, the hydrazine injection was completed.

* On December 22, we conducted the gas sampling of Unit 2 Primary 
  Containment Vessel (PCV) Gas Control System. As a result of analysis, it 
  was confirmed that the gas concentration of Xe-135 at the inlet of the 
  PCV Gas Control System was below detective limit (1.0 x 10-1 Bq/cm2) and 
  lower than the standard of recriticality, 1 Bq/cc.

* At around 1 pm on December 22, it was found that the hose of Unit 3 
  Reactor Water Injection Line was swollen to the extent of 2 meter long. 
  Although there was no leakage from the swollen hose, it was decided that 
  the pump for Reactor water injection should be switched from the reactor 
  injection pump on the hill to the emergency motor pump and the hose 
  should be replaced with new one.(+) At 7:12 pm on the same day, the 
  emergency motor pump was started to operate. From 7:44 pm, the valve to 
  the normal water injection line was closed in order to weep drain from 
  the line. After the replacement of the hose, at 8:47 pm, the valve to the 
  normal water injection line was opened to fill water in the line. At 10 
  pm, it was confirmed that there was no water leakage from the new hose, 
  so that water injection to the Reactor was adjusted to about 3 m3/hour 
  from Reactor Feed Water System and about 6 m3/hour from Reactor Core 
  Spray System at about 10:30 pm. At 10:38 pm, the emergency motor pump was 
  stopped. After that, it was checked that there was no leakage from the 
  hose and its connection. During the hose replacement work, the water 
  injection was continued and there was no remarkable change in temperature 
  of the Reactor Pressure Vessel.

· 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.

+ Article 12 of Safety Regulation at Nuclear Facilities stipulates 
  "operational limit" and "required measures if the operational limit is 
  not satisfied" according to the facility management based on "the mid-
  term view point for securing safety". It also stipulates to respond based 
  on the required measures if the operational limits is not satisfied. In 
  the case of today's hose swollen, it was regarded to be sifted off the 
  operational limit as planned (from 6:35 pm on December 22 to 10:43 pm on 
  the same day) from the proactive maintenance point of view, so that the 
  hose replacement work was implemented accordingly.

Appendix: Past Progress (As of 9:00 am, December 23, 2011) (PDF 246KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress