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 4:27 pm on January 29, we stopped the operation of the secondary
air-fin coolers (the temperature of fuel pool at the time of stoppage:
21°C) of spent fuel pool in order to prevent overcooling of alternative
cooling system of spent fuel pool of Unit 4.
- Because we completed the replacement of water injection line of water
injection pump located on upland with polyethylene pipes following the
reliability improvement of water injection to the reactors, we have
changed the amount of water injection to the reactors in a step-by-step
manner. At 10:10 am on January 30, for the amount of water injection to
the Unit 2's reactor, we changed the amount of water injection from
water feeding system from approximately 7.0m3/h to approximately 6.0
m3/h and that from Core Spray System from approximately 1.8 m3/h to
approximately 3.0 m3/h. At 10:14 am on the same day, for the amount of
water injection to Unit 3's reactor, we change d the amount of water
injection from water feeding system from approximately 7.1m3/h to
approximately 6.0 m3/h and that from Core Spray System from
approximately 1.9 m3/h to approximately 3.0 m3/h.
- We plan to conduct replacing the water injection line of the reactor
water injection pump on the hill from pressure proof hose to
polyethylene pipe in order to improve the reliability of water
injection to the reactor. Since we have to temporally suspend the water
injection to achieve this work, on January 30, regarding the water
injection to the reactor of Unit 1through the water feeding system, we
switched from the reactor water injection pump on the hill to the
reactor water injection pump in the Turbine Building and we increased
the water injection volume from the feed water system from approx. 5.6
m3/h to approx. 6.5 m3/h, and decreased the volume from the reactor
core spray system from 0.9 m3/h to approx. 0m3/h at 10:38 am on January
30.
- At 1:15 pm on January 30, we started injection of hydrazine to spent
fuel pool of Unit 2 through the circulating cooling system. At 2:56 pm
on the same day, we stopped injection of hydrazine.
· Fukushima Daini Nuclear Power Station:
(Units 1 to 4: shutdown due to the earthquake)
- At around 11:13 am on January 30, according to the report from the
field worker that smoke emitted from the switch box when he opened the
door located at the basement of the control building of Unit 1 and 2,
at around 11:19 am, a TEPCO worker checked the scene and fire was not
found at the time. We reported the incident to the fire station at
11:48 am. Afterwards, as the result of inspection of the scene by fire
station, at 0:23 pm, it is considered that fire was not occurred. There
is no radioactive influence to the outside by this occurrence.
· 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 3:00 pm, January 30, 2012) (PDF 385KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress
