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 accompl
ishment 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)
-With regard to the water injection volume for Unit 2 reactor, which was
increased with temperature figure raising, we have gradually adjusted it
to the original volume before temperature increasing (Feed water system:
approx. 3.0m3/h, core spray system: approx. 6.0m3/h). During our
observing the plant parameter after the decreasing the flow rate of feed
water system on February 22, we found that one thermometer in the lower
part of the RPV indicated the different movement from others. From 0:21
pm to 2:48 pm on February 23, we investigated the concerned device. As
the result of the measurement of DC resistance, we found no breaking
wire and availability of the thermometer. But we confirmed that the DC
resistance of it became higher than the previous measurement test data.
We will evaluate the soundness of the concerned device and examine
correspondence in future. We make sure no re-criticality state because
there were no significant changes at the monitoring post and as the
result of the sampling for the Gas Control System of the Unit 2, we
confirmed that the concentration of Xe-135 was below the detectible
limit.
·At 5:00 am on March 2, the temperature of the lower part of the RPV
(top of the lower head 135°) : approx. 44.7 °C
·At 5:00 am on March 2, the temperature of the lower part of the RPV
(top of the lower head 270°) : approx. 41.4 °C (reference)
-As we confirmed that high radioactivity contaminated water is
accumulating in the pit of water circulating pump discharge valve of
unit 3 pump chamber at the inspection of trench etc. conducted on
January 19, we started to transferring accumulated water from the pit to
the basement of unit 2 turbine building at 8:26 am, March 1. At 3:18 pm
on the same day, we stopped transfer.
-At 10:00 am on March 1, we start transfer of the accumulated water from
the basement of Turbine Building of Unit 6 to the temporary tank. At
4:00 pm on the same day, we stopped transfer.
-In order to conduct the work to improve the reliability of water
treatment facilities, we are planning to stop water treatment facilities
one after another. At 8:45 am on March 1, we stopped the cesium
adsorption apparatus. It will be out of service until March 15. We
calculated the estimated water level increase at each building due to
the stop o the facilities, and confirmed that the water levels in each
building will be maintained within the limits. We also have sufficient
volume of treated water, therefore there will be no impact on the water
injection to the reactors. At 8:07 am on March 2, we stopped the 2nd
Cesium Adsorption Apparatus.
-At 9:44 am on March 2, in order to conduct the work to switch the
control circuits of on-site power source for operation of southern
switching station, we cut the power of on-site power source. The
evaporation apparatuses of water desalination facilities and
desalination facilities (reverse osmosis membrane type) are out of
service due to the work to switch the control circuits. We also have
sufficient volume of treated water, therefore there will be no impact on
the water injection to the reactors.
·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 the facilities damaged by the
earthquake are now being handled in a timely manner.
[Hydro Power Station]
·Power supply has returned to normal and the facilities damaged by the
earthquake are now being handled in a timely manner.
[Impacts on Transmission Facilities]
·Power supply has returned to normal and the facilities damaged by the
earthquake are now being handled in a timely manner.
[Impacts on Power Supply and Demand Balance]
We expect to maintain stable power supply in March.
Daily supply and demand balance is announced at our "TEPCO Electricity
Forecast".
Appendix: Past Progress (As of 10:00 am on March 2, 2012) (PDF 459KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress