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 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 27,
2012) (PDF 566KB)
Appendix: Past Progress (From March 11, 2011 to July
31, 2011) (PDF 225KB)