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 1 to 4: shutdown due to the earthquake) - At 1:31 pm on January 26, we started injection of hydrazine to the
spent fuel pool of Unit 4 through the circulating cooling system. At
3:07 pm, we stopped injection of hydrazine. - For the reliability enhancement of water injection into the reactor,
the water injection line of the reactor water injection pump on the
hill is planned to be changed from pressure hose to polyethylene pipe.
Therefore, there is the necessity of the temporary stopping of water
injection from the reactor water injection pump for it. At 5:10 pm on
January 25, regarding the reactor injection from the feed water system
at the Unit 2, we changed the injection line from the pump located
uphill to the T/B reactor injecting pump. At 9:47 am on January 26,
the volume from the feed water system increased from approx. 7.9 m3/h
to approx. 8.7 m3/h, and the volume from the reactor core spray system
decreased from approx. 1.0 m3/h to 0 m3/h. After finishing switching
work of the water injection line from the water injection pump on the
hill at 2:51 pm, the injection line from the feed water system was
switched from the reactor water injection pump on the hill to the
reactor water injection pump in the turbine building at 3:31. At 3:50
pm, the volume from the feed water system decreased from approx.
8.7 m3/h to approx. 8.0 m3/h, and the volume from the reactor core
spray system increased from 0 m3/h to approx. 1.0 m3/h. At 9:43 am on
January 27, the volume from the feed water system decreased from approx.
8.2 m3/h to approx. 6.9 m3/h, and the volume from the reactor core
spray system increased from approx. 0.7 m3/h to approx. 2.0 m3/h. - At 9:44 pm on January 26, we started transfer of the accumulated water
from the basement of the turbine building of Unit 2 to the Centralized
Radiation Waste Treatment Facility (Miscellaneous Solid Waste Volume
Reduction Treatment Building [High Temperature Incinerator Facility]).
At 8:14 am on January 27, we stopped it. - At 9:40 pm on January 26, we started transfer of the accumulated water
from the basement of the turbine building of Unit 3 to the Centralized
Radiation Waste Treatment Facility (Miscellaneous Solid Waste Volume
Reduction Treatment Building [High Temperature Incinerator Facility]).
At 8:10 am on January 27, we stopped it. - For the reliability enhancement of water injection into the reactor,
the water discharge line of the reactor water injection pump on the
hill is planned to be changed from pressure hose to polyethylene pipe.
Therefore, there is the necessity of the temporary stopping of water
injection from the reactor water injection pump for it. At 11:50 am
January 26, the water injection to the reactor of Unit 3 from the feed
water injection system was switched from the reactor water injection
pump to the reactor water injection pump in the turbine building. At
9:14 am on January 27, the volume from the feed water system increased
from approx. 8.5 m3/h to approx. 8.9 m3/h, and the volume from the
reactor core spray system decreased from approx. 1.0 m3/h to 0 m3/h. - Because of the finding of accumulated water included 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), we started the
inspection of other trenches at the site on January 11.
As a result of the inspection on January 26, the locations where
accumulated water was discovered and the nuclide analysis results are
as follows: Off-gas piping duct, Unit 1
I-131: below measurable limit, Cs-134: 5.5x10-1Bq/cm3, Cs-137:
8.9x10-1Bq/cm3
Activated Carbon holdup duct, Unit 1
I-131: below measurable limit, Cs-134: 1.6x10-1Bq/cm3, Cs-137:
2.7x10-1Bq/cm3
Main Transformer Cable Duct, Unit 2
I-131: below measurable limit, Cs-134: 8.1x10-1Bq/cm3, Cs-137:
1.1x100Bq/cm3
Connection Duct of Waste Liquid Surge Tank, Unit 2.
We confirmed that no accumulated water.
Common-use Boiler Trench of Unit 2-3
We confirmed that no accumulated water.
Main Transformer Cable Duct, Unit 2
I-131: below measurable limit, Cs-134: 1.4x100Bq/cm3, Cs-137:
1.8x100Bq/cm3· 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 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.
* Correction of Description in [Impacts on Power Supply and Demand Balance]
We described,"there will be some minus factors such as the regular
inspection of Unit 5 at Kashiwazaki-Kariwa Nuclear Power Station" in the
previous press release. However, because Unit 5 of Kashiwazaki-Kariwa
Nuclear Power Station has already conducted a regular inspection since
January 25, we revise the previous sentence to "there are some minus
factors such as the regular inspection of Unit 5 at Kashiwazaki-Kariwa
Nuclear Power Station". We would like to apologize for the correction
(February 8, 2012).
Appendix: Past Progress (As of 10:00 am, January 27, 2012) (PDF 566KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress
