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.

* 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 10:00 am on December 12, we started to transfer the water accumulated
  in the basement of Unit 6 Turbine Building to the temporary tank. At
  4:00 pm on the same day, we stopped the transfer.

* At 3:53 pm on December 12, the annunciator alerted for the Unit 2 SFP
  alternative cooling system, which showed the difference between inlet
  and outlet flow at the primary pump exceeded the limit. Any
  abnormalities like water leakage were not observed by patrolling at the
  site. Currently the automatic trip system by the annunciator is
  temporarily removed, and monitoring the level of the skimmer surge tank
  is enhanced as the alternative monitoring measure. The cooling system
  will be manually tripped if there are abnormalities on the skimmer surge
  tank level, which is confirmed there is no change on the level. At 5:18
  pm, after vibrated the instrument piping, it was confirmed the
  annunciator was cleared. It is planned to enhance the monitoring after
  the inspection of flow meters and the flushing of detection lines. There
  is no problem on the SFP cooling as the alternative cooling system is
  continuously operated.

* On December 4, it was found that puddle water inside the barrier around 
  the evaporative condensation apparatus 3A to 3C was leaked through the 
  crack at the concrete floor widened by the deformation of the sealing 
  material. Afterwards the similar places were inspected, and then the
  damage of the concrete floor was found around the evaporative
  condensation apparatus 1A to 1C. On December 6, the repair work of the
  concrete floor was completed. The leak water detection device will be
  installed inside the barrier by December 15 as one of the measures for
  preventing the recurrence of such leakage, in addition to the patrolling
  six times a day until the device will be installed. Upon the preventing
  measures are prepared, and considering the water mass balance, the
  evaporative condensation apparatuses 1B, 1C and 1A were re-started on
  2:33 pm, 2:46 pm and 3:50 pm on December 12, respectively.

* At around 4 pm on December 12, it was found the water spilled from the
  bucket, which was used to collect drain water from sampling line of the
  evaporative condensation apparatus 3C. The paddle water was spread
  around 1 meter radius from the bucket (the capacity of the bucket:
  approx. 7 liters, spilled water: approx. 3 liters), which stayed inside
  the barrier. At around 7:30 pm, when replaced the bucket to new one, it
  was confirmed that there was no leakage form the valve of the sampling
  line. At around 8:30 pm, when patrolling at the site, it was found that
  the water spilled from the bucket again. The paddle water was then
  spread around 1.5 meter radius (the capacity of the second bucket:
  approx. 12 liters, spilled water: 7 liters), which stayed inside the
  barrier, too. At around 8:50 pm, the valve of the sampling line was
  tightly closed as it was found that the valve was not completely closed,
  and it was confirmed there was no water leakage. Around 10:25 pm, the
  inlet and outlet valve of the pump was closed for pre-caution. The same
  operation was done for 3A and 3B of the evaporative condensation
  apparatuses. At around 11:40 pm, it was confirmed that there was no
  additional leakage at the site.

* At 6:03 pm on November 30, we started the transfer of the accumulated 
  water from the basement of Turbine Building of Unit 2 to the centralized 
  radiation waste treatment facility (miscellaneous solid waste Volume 
  reduction treatment building [high temperature incinerator building]). 
  At 7:51 am on December 13, we stopped the transfer of the accumulated
  water from the basement of Turbine Building of Unit 2 to the centralized
  radiation waste treatment facility (miscellaneous solid waste Volume
  reduction treatment building [high temperature incinerator building]) in
  order to stop power supply to Unit 2 accumulated water transfer pump for
  power supply enhancing work. With the stoppage of the water transfer,
  the 2nd Cesium adsorption apparatus was shutdowned for replacing vessels
  at 8:44 am on December 12, and will be kept outage until December 14 in
  order to adjust the water level of the centralized radiation waste
  treatment facility (miscellaneous solid waste Volume reduction treatment
  building [high temperature incinerator building]). The Cesium adsorption
  apparatus is continued its operation. Water injection to the Reactors
  will not be affected since the cooling is continued by using processed
  water in the buffer tank.

* With switching the power source for the improvement work of the on-site 
  power source, at 10:30 am on December 11, Unit 1 SFP alternative cooling 
  system was stopped (SFP water temperature at the time of stoppage was 14 
  °C). At 5:07 pm on December 12, Unit 1 SFP alternative cooling system
  was resumed (SFP water temperature at the time of resume was 15 °C).

· 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 13, 2011) (PDF 399KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress