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 9:43 am on December 22, At the Alternative Cooling apparatus of Spent
  Fuel Pool Cooling and Filtering System of Unit 3, since the suction
  force of primary circulating pump decreased, we stopped the pump to
  conduct flushing of entrance-side strainer of primary circulating pump
  and stopped cooling of spent fuel pool. (The temperature of pool is
  approx. 13°C when the pump stopped) Then, we flushed the strainer so
  that the suction force recovered. Thus, at 11:06 am on the same day,
  restarted the pump and began to cool the spent fuel pool. (The
  temperature of pool is approx. 13°C when the pump restarted)

* At 10:00 am on December 22, we started to replace the transmission parts
  of monitoring post No.2 and No.8 which monitor dose rate inside the site.
  At 11:40 on the same date, we finished the replacement work. In addition,
  monitoring post No.8 data was unavailable from 11:10 am to 11:40 am, but
  we confirmed that the other monitoring posts didn't indicate unusual
  values. Monitoring post No.2 was available during the replacement work
  due to the replacement parts are different from Monitoring post No.8.

* At 10:11 am on December 22, since we finished the recovery work of
  seawater pump (System B) of equipment water cooling system of Unit 5, we
  made a trial run. At 11:25 am on the same day, we confirmed no
  abnormalities and restarted the operation.
* On December 22, according to the operational record thus far of Unit 1,
  we changed the volume of nitrogen into PCV and that of gas emitted from
  PCV gas control system. At 10:35 am on the same day, we decreased the
  nitrogen injection amount from approx. 18Nm3/h to approx. 13Nm3/h. In
  addition, at 11:45 am, we confirmed the volume of gas emitted from the
  gas management system decreased from approx. 30Nm3/h to 26.9Nm3/h.

* At 1:30 pm on December 22, we started to inject hydrazine into Unit 3
  spent fuel pool using circulating cooling system.

· 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 22, 2011) (PDF 242KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress