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, 2011, we have compiled the roadmap towards restoration from the
accident and on July 19 we accomplished the Step1 target "Radiation dose is
in steady decline". Then on December 16 we confirmed the accomplishment of
the Step 2 target "Release of radioactive materials is under control and
radiation doses are being significantly held down".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term
Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units
1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will
implement Mid-to-Long Term countermeasures towards the decommissioning of
Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to
their homes as soon as possible and reduce the anxiety of the people in
Fukushima and the whole nation as soon as possible.
Below is the status of TEPCO's major facilities.
* The updates are 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 before the earthquake)
- At about 7:10 pm on February 4, a worker of a partner company which
operated the water desalinations said he was in bad shape. He was
examined and treated at the emergency medical clinic of Unit 5&6 and
judged that he required an emergency transfer. Then he was transferred
to the J Village at 9:06 pm. After that, at 9:50 pm, he was transferred
to Iwaki Kyouritsu Hospital from the J Village. At this moment, the
doctors examine and treat. The patient does not have any radiation
materials.
- At 10:56 pm on February 4, "Abnormal state (low pressures) in suction
pressure of RO high pressure pump" triggered the alarm in the desalting
facility for spent fuel pool of Unit 2, and the facility automatically
stopped. Because all isolation valves of the system have been closed due
to the interlock and the alternative cooling system for spent fuel pool
is continuously operated, it does not affect the cooling for the spent
fuel pool. In addition, as a result of site check, it was confirmed that
any leakage from the facility was not found. The cause is now under
investigation.
- At 9:49 am on February 5, we started water transfer from the basement of
turbine building of Unit 3 to Centralized Radiation Waste Treatment
Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building
[High Temperature Incinerator Building]).
- Since February 2, the tendency of temperature has risen at the bottom of
PCV. Thus, at 7:20 pm on February 3, we changed the injection amount
into Unit 2 reactor through feed water system from approx. 2.9 m3/h to
approx. 4.9 m3/h and changed that though reactor core spray system from
approx. 5.8 m3/h to approx. 3.8 m3/h (which means setting them at those
of before flow adjustment on February 1). After that, we have observed
the tendency of temperature at the upper head of the bottom of PCV.
Because we found the temperature has risen again (approximate 66.1 °C at
11:00 pm on February 4), at 12:52 am on February 5, we changed the water
injection volume to Unit 2 reactor through the feed water system from
approx. 4.8 m3/h to approx. 5.8 m3/h (the water injection through the
reactor core spray system remains approx. 3.8 m3/h). At this moment, the
temperature indicates 67.4 °C (as of 5:00 am on February 5). we will
monitor it continuously.
· Fukushima Daini Nuclear Power Station:
(Units 1 to 4: shutdown due to the earthquake)
· Kashiwazaki Kariwa Nuclear Power Station: Units 6: under normal
operation
(Units 1 to 5 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 are some minus factors such as the regular inspection of
Unit 5 at Kashiwazaki-Kariwa Nuclear Power Station. On the other hand,
there are several plus factors such as the recovery of the common thermal
power stations which suffered the earthquake. As a result, we expect to
secure 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 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 10:00 am, February 5, 2012) (PDF 403KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress