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.

* Underlined are 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)

* At 11:33 am on December 4, workers found that there was puddle water 
  inside the barrier around the evaporative condensation apparatus 
  (estimated volume of water was approx. 45 m3). At 11:52 am, we stopped 
  the apparatus, and at 12:14 pm, workers made visual inspection of the 
  apparatus and the leakage seemed to have stopped. After that, we 
  conducted investigation at 2:30 pm, and found a crack in the concrete 
  barrier, and water leaking from this crack to the gutter (surface dose 
  rate of leaked water: beta ray 110 mSv/h, gamma ray 1.8 mSv/h). We also 
  found water leaking from between the barrier and the base concrete. We 
  are considering measures to stop this leakage to outside of the barrier. 
  The water desalination apparatus (reverse osmosis membrane type) is 
  continuing operation. As we have sufficient volume of desalinated water, 
  there is no impact on the Reactor water injection. At 3:30 pm we 
  confirmed that the leakage had stopped by piling up sandbags between the 
  barrier and base concrete, and in the gutter. From 6:20 pm to 10:20 pm 
  we sent the leaked water remaining in the barrier to the waste water RO 
  supply tank with a water pump. Since the gutter led to the generally used 
  channel of the power plant, we have taken sea water from the channel 
  around the water desalinations (evaporative concentration apparatus) and 
  the south drain (drain for the generally used channel) and have conducted 
  a nuclide analysis. We concluded that the figures of the results of the 
  analysis were as the same or slightly higher than the usual results we 
  are announcing daily. On 5 December we again sampled the water of the 
  channel near the water desalination (evaporative concentration apparatus) 
  and the south drain (exit of the channel) and conducted a nuclide 
  analysis, and the results of the south drain showed the same level as the 
  results we are announcing daily.

* At 10:00 am on 5 December, we started transferring accumulated water in 
  the basement of unit 6 turbine building to the temporary tank.

* On 5 December we started increasing nitrogen injection to reactors of 
  Unit 1 and 3, from which we started on 30 November, due to stabilized 
  parameters of the facilities of the power plants such as the Reactor 
  Pressure Vessel and the Primary Containment Vessel.
· Unit 1:10:44 am, increased nitrogen injection from approx. 5m3/h to 
  10m3/h.
· Unit 3: 10:25 am, increased nitrogen injection from approx. 5m3/h to 
  10m3/h.

* At 10:31 am of 5 December, we stopped the transfer of accumulated water 
  from the basement of the turbine building of unit 3 to the Centralized 
  Radiation Waste Treatment Facility (Process Main Building).

* At 10:35 am of 5 December, we started dust sampling above the reactor 
  building of unit 3 with a large crane. At 12:05 pm we finished this.

· 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 5, 2011) (PDF 374KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress