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.

*The underlined parts are the 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)

On November 22, we sampled gases in gas management system in primary 
containment vessel of Unit 2 to analyze nuclides. As a result of nuclides 
analysis, we evaluated that there is no recriticality since the density of 
Xe-135 is below the detection limits (1.1X10-1 Bq/cm3) and that indicates 
the analyzed figure is below the determination criteria for recriticality 
such as 1 Bq/cm3. Regarding Xe-135, we decided to use the sampling result 
at gas vial container at inlet in gas management system to evaluate the 
recriticality based on the "Report with regard to "Policy on the mid term 
security" for the Units 1 to 4 of Fukushima Daiichi Nuclear Power Station 
to Nuclear and Industrial Safety Agency at the Ministry of Economy, Trade 
and Industry (1) (revision)" (Press released on November 9th) because 
charcoal filter was used to detect Xe-135 and we evaluated that they are 
created by spontaneous fission. 
 *Detection Limits Charcoal Filter: Order of 10-6, Gas Vial Container: 
  Order of 10-1

*At 10:47 pm on November 18, alarm occurred indicating high pressure of 
 treated water, and desalination plant (RO) unit 2-2 suspended due to 
 automatic suspend of a high pressure pump and a booster pump. There is 
 no impact for water injection to the reactor because of enough fresh 
 water stock. On November 22, we checked outside of the unit and found no 
 trouble, and so we remove the discharged water in drain line at exit side 
 of the Unit and reset the alarm. At 2:00 pm on the same day, we 
 restarted the Unit. While we had been checking the operation of the Unit, 
 at 9:56 am on November 23, the alarm occurred again indicating the high 
 pressure of treated water at the exit side of Unit2-2, and the unit 
 stopped automatically. We are now investigating the reason of this 
 incident. There is no impact for water injection to the reactor because 
 of enough fresh water stock. 

· 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 10:00 am, November 23, 2011) (PDF 158KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)