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 October 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 3:48 pm on November 4, we started transferring accumulated water from
the basement of the turbine building of Unit 1 to the basement of the
turbine building of Unit 2. At 9:41 am on November 6, we stopped
transferring.
*At 10:00 am on November 6, we started transferring accumulated water from
the basement of the turbine building of Unit 6 to the temporary tanks.
*At around 11:00 am on November 6, partner companies' workers who went on
patrol found that the boiler of evaporative concentration apparatus
stopped, and stopped operation of 3B and 3C of the apparatus. Since the
operation panel on the site alerted "Very low water level in boiler supply
water tank", we assumed that the boiler stopped due to this reason. After
that, we investigated the cause on decrease of supply tank water level.
When we tried to start a backup pump for transfer of boiler supply water,
the alert stopped. Thus we judged that one pump was a bad condition.
Although all the evaporative concentration apparatus stopped, water
treatment by the water desalinations (RO membrane system) and water
injection to the reactors have been continued.
*At 11:04 am on November 6, we started operation of radioactive material
removal instruments for the spent fuel pool of Unit 2.
· 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.
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Appendix: Past Progress (As of 3:00 pm on November 6, 2011) (PDF 133KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress