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 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 9:42 am on January 19, we started filling water to the condensate
storage tank, Unit 3. At 6:00 pm on the same day, we finished filling
water. At 9:05 am on January 21, we restarted filling water.
- At 3:17 pm on January 20, we started transferring accumulated water
from the basement of T/B, Unit 3 to the Central Radioactive Waste
Treatment Facility (Miscellaneous Solid Waste Volume Reduction
Treatment Building [High Temperature Incinerator Building]).
- At 3:23 pm on January 20, we started transferring accumulated water
from the basement of T/B, Unit 2 to the Central Radioactive Waste
Treatment Facility (Miscellaneous Solid Waste Volume Reduction
Treatment Building [High Temperature Incinerator Building]).
At 7:02 am on January 21, a worker from the cooperating company found
water leakage from the transfer piping at the large equipment hatch,
T/B, Unit 4.
We checked the work site and observed water leakage from a flange of
the piping to a valve unit. Part of water dripped to the floor outside
of the valve unit. At 7:48 am on the same date, we stopped the transfer
pump for the accumulated water. At 7:55 am, we confirmed that the
dripping of water stopped. The water was within the T/B and there was
no leakage to outdoor, no leakage to the sea. The volume of water
dripped to the floor of T/B was approx 2 liters. The surface dose rate
was 0.1mSv/h. We will conduct flushing of the transfer piping for
accumulated water, check the flange and repair.
- At 3:37 pm on January 20, we started transferring accumulated water
from the basement, T/B, Unit 1 to the basement, T/B, Unit 2.
- At 10:00 am on January 20, we started transferring accumulated water
from the basement, T/B, Unit 6 to temporary tanks. At 4:00 pm on the
same date, we stopped the transfer.
- We are gradually adjusting the water injection rate to Reactor, Unit 2
in order to switch the water injection piping for reactor injection
pump on the hill. At 9:55 am on January 21, we adjusted the amount of
the water injection from approx. 5.0 m3/h to approx. 6.0 m3/h through
the reactor feed water system, from approx. 5.0 m3/h to approx. 4.0 m3/h
through the core spray system.
- Further to the finding of accumulated water containing radioactive
materials at the trench between the Process Main Building and the
Miscellaneous Solid Waste Volume Reduction Treatment Building[High
Temperature Incinerator Building](December 18, 2011), on January 11, we
started the inspection of other trenches within the power station site.
The location and nuclide analysis result (a prompt report) of the
inspection on January 20 was as below:
Off-gas piping duct, Unit 3
I-131: below detection limit, Cs-134: 3.1 x 101Bq/cm3,
Cs-137:4.1 x 101Bq/cm3
· 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 54.6 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 - 3.1 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, January 21, 2012) (PDF 349KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress
