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.
* 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)
- According to the investigation on trenches on January 19, 2012, high
density contaminated water inside was found inside circulating water
pump discharge valve pit of Unit 2 water pump room. Therefore, on
February 20, we started transfer of the accumulated water from the
pit to the basement of Unit 2 Turbine Building. At 9:43 am on
February 22, we restarted the transfer and stopped it at 3:58pm on
the same day.
- 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). As no abnormality has been observed in the variation of the
plant parameter after the change in the flow rate on February 20, at
8:17 pm on February 22, we changed the water injection volume from
feed water system from approx.4.0m3/h to approx. 3.0m3/h (The water
injection level from core spray system is continuing at approx.
6.0m3/h).
- At 9:17 am on February 20, we stopped transferring the accumulated
water at the basement of Unit 2 Turbine Building to Centralized Waste
Treatment Facility (Miscellaneous Solid Waste Volume Reduction
Treatment Building [High Temperature Incinerator Building]) in order
to switch the transfer pumps, and at 9:39 am on February 20, the
transfer restarted. At 8:28am on February 23, the transfer stopped.
- On February 22, 2012, we conducted gas sampling survey of the PCV gas
control system of Unit 2 and confirmed that Xenon 135 was below the
detection limit (1.1 x 10-1Bq/cm3) at the inlet of the system and
also below 1 Bq/cm3 that is a threshold of recriticality.
· 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]
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.
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Appendix: Past Progress (As of 10:00 am on February 23, 2012) (PDF 442KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress