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 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, 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.
* Updates since the previous press release 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)
* At 10:14 am on December 27, we started transfer of accumulated water from
site banker to process main building in the centralized radiation waste
treatment facility.
* The second Cesium adsorption apparatus, which has been shut down since
8:33 am on December 12, restarted at 10:37 am on December 27. Treatment
of accumulated water restarted which has been suspended since December 20.
* At 11 am on December 27, regarding the water injection into the reactor
core of unit 2, for the purpose of preparation of commissioning of water
injection pumps for diversification, water injection rate from feed water
system was adjusted from approx. 2.8 m3/h to 2.0 m3/h, from core spraying
system was adjusted from approx. 6.0 m3/h to 7.0 m3/h.
* Due to the completion of restoration of residual heat recovery (RHR) sea
water pump (A) of unit 6, which was not be able to use by the affect of
tsunami, at 10:19 am on December 27, commissioning was started, at 11:30
am as no incident was observed, it returned to usual operation. As a
result, two RHR pumps, (A) and (C), had been returned to service. During
the commissioning, while RHR pump (A) of unit 6 was temporary stopped
from 10:01 am to 11:09 am and cooling of reactor core was suspended, as
the increase of core water was approx. 0.7°C and there were no concerns
to the safety.
* At 1:58 pm on December 27, in the alternative cooling system of the spent
fuel pool of Unit 2, as the inhale pressure of the primary circulating
pump showed the tendency of decrease, we stopped the pump in order to
conduct flushing of the strainer on its entry side and suspended cooling
of the spent fuel pool (the temperature of the pool at the time of the
suspension was approx. 14.2°C)
· Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to the earthquake
* At 10:06 am on December 27, for the purpose of determine soundness of
reactor primary containment vessel of unit 1 and internal facilities,
airlock for the workers (hatch to enter into the primary containment
vessel) was opened and started sight survey.
· 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, December 27, 2011) (PDF 254KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress