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)

* We plan to establish the system injecting water into the reactor in Unit
  1 to 3 using the condensate storage tank of Unit 3. In preparation of
  such establishment, the stored water in the tank was transferred to the
  basement of turbine building of Unit 3 from 10:22 am on November 21 to
  9:45 am on November 24. As the calibration of water level gauge is
  required if all the water is transferred, approx. 200 ton was left in the
  tank. During the measurement of salt concentration in the left water, it
  turned out that concentration was high. In order to secure the space for
  additional water injection to decrease such concentration, at 10:00 am
  on December 6, the left water was transferred from the tank to the
  basement of the turbine building of Unit 3. At 8:54 am on December 7, we
  stopped transferring. At 9:19 am on the same day we started injecting
  water in the tank. Then we discovered that there was a leak of water
  (approx. 5l) from the connecting part of the hose and the tank, and at
  9:52 am we stopped water injection. After this we confirmed that the
  leak had stopped. We will take measures to repair the leaking point. The
  water that leaked out was water after decontamination and desalination.

* On December 6 we conducted air sampling at the gas controlling system of
  the Primary Containment Vessel of unit 2. As a result we confirmed that
  at the exit of the gas controlling system of the Primary Containment
  Vessel, the level of xe-135 detected was below detection limit
  (1.1X10-1Bq/cm3) and below the recriticality standard 1Bq/cc.

* On December 7, in order to secure enough time before the hydrogen
  reaches the explosion limit in case the nitrogen injection facility
  stops, we increased the injection amount of Nitrogen to the Reactor
  Pressure Vessel.
  ·Unit 1: 1:15 pm, increased from 10m3/h to 15m3/h
  ·Unit 2: 2:16 pm, increased from 10m3/h to 13m3/h
  ·Unit 3: 10:52 am, increased from 10m3/h to 15m3/h
  On December 7, since it is possible to secure enough time before the
  hydrogen reaches the explosion limit in case the nitrogen injection
  facility stops in the Primary Containment Vessel of unit 2, we decreased
  nitrogen injection from 26m3/h to 20m3/h.

* At 10:55 am of December 7, in order to increase the reliability of
  nitrogen injection, we started installing works of flow rate indicators
  and pressure indicators to the unit 1 nitrogen injection line. At 11:26
  am this work was completed. During this time we stopped injecting
  nitrogen but there was no impact to 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.

Appendix: Past Progress (As of 3:00 pm, December 7, 2011) (PDF 204KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)

* Revised past progress