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)
- At 4:24 pm on November 8, we stopped the radioactive material removal
instruments of the spent fuel pool of Unit 2 and the cooling system of
spent fuel pool was stopped at 5:43 am for unit 1 and at 5:41 am for
unit 2 due to the switching work of electricity to enhance security of
electricity source. (The temperature of the spent fuel pools were 22°C
(Unit 1), 23.9°C (Unit 2) when the instruments were stopped.) At 8:47
pm on November 9, we restarted the radioactive material removal
instruments of the spent fuel pool of Unit 2. The cooling system of
spent fuel pool was restarted at 8:20 pm for unit 2 and at 10:29 pm
for unit 1. (The temperature of the spent fuel pools were 20°C (Unit 1),
26.3°C (Unit 2) when the instruments were restarted.)
* The temperature of the spent fuel pool of Unit 1 became lower. This
was presumed to be influenced by water in Skimmer Surge Tank whose
temperature was lowered by open air.
- At 10:00 am on November 9, we started transferring accumulated water
of the basement of Unit 6 to the temporary tank, and stopped the
transfer at 4:00 pm on the same day.
- On November 9, sampling survey of gas at the gas management system of
Unit 2 primary containment vessel was implemented. According to its
analysis, it is considered that recriticality was not occurred because
radioactive Xe135 at the entrance of gas management system of Unit 2
was below detection limit (1.1x10-1Bq/cm3). In addition, Xe-135 (1.9x
10-5Bq/cm3) was detected by charcoal filter. This was measured value
and evaluated to be the amount emitted from the gas management system.
Thus, the value measured by gas vial was converted into the value of
1.1x10-2Bq/cm3 using achievement rate. This value was the same as 2.7x
10-2Bq/cm3 that was evaluated before.
· 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 9:00 am, November 10, 2011) (PDF 140KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress