Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March
11th 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 17th, we have put together the roadmap towards restoration from the
accident and then we updated the roadmap considering the current situation,
on May 17th. By bringing the reactors and spent fuel pools to a stable
cooling condition and mitigating the release of radioactive materials, we
will make every effort to enable evacuees to return to their homes and for
all citizens to be able to secure a sound life.
Below is the status of TEPCO's major facilities.
*Updates from previous press release are underlined.
[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station:
Units 1 to 3: shutdown due to the earthquake
(Units 4 to 6: outage due to regular inspections)
- On May 23rd, we changed the rate of water injection to Unit 3 through
the fire extinction system piping arrangement from approximately 4 m3/h
to approximately 3 m3/h at 5:19 Pm.
- On May 23rd from 2:17 pm to 2:37 pm , we sampled, on a trial basis,
radioactive materials in the ambient air at the opening of the Reactor
Building, Unit 4. We will analyze and evaluate.
- At 4:00pm on May 23rd, we started to spray water to the spent fuel pool
of Unit 4 by the concrete pumping vehicle (We added hydrazine from 4:08pm
to 6:30pm). We finished spraying at 7:09pm on the same day.
- The transfer of accumulated water in Unit 6 turbine building to a
temporary tank was started at 9 am on May 24th.
- On May 23rd, we sprayed dust inhibitor to approximately 6,000 m3 area
on the east sides of the turbine building of Units 3, using an unmanned
crawler dump truck in order to prevent diffusion of radioactive materials.
- On May 23rd, we sprayed dust inhibitor to approximately 8,750 m3 areas
including nearby Solid Waste Storing Facility in a conventional method.
Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to the earthquake
Kashiwazaki Kariwa Nuclear Power Station:
Units 1, 5, 6, 7: normal operation
(Units 2 to 4: outage due to regular inspection)
[Thermal Power Station]
- Hirono Thermal Power Station Unit 2 and 4: Shutdown due to the earthquake
[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.
[Perspective of Power Supply and Demand Balance in this Summer]
We have worked to restore electricity supply after our nuclear and thermal
power facilities were severely damaged by Tohoku-Chihou-Taiheiyou-Oki
Earthquake. This time, we revised that the supply capacity in this summer
would increase because we could plan to secure an additional capacity.
However, in order to maintain the policy of avoiding further implementation
of rolling blackouts during the summer, in addition to the above increase
of the supply capacity, we sincerely ask for your continued cooperation
in reducing electricity consumption. Now we are creating concrete measures
considering "Outline of Countermeasures for Power Supply and Demand During
Summertime" presented by the Electricity Supply-Demand Emergency Response
Headquarters of the Japanese government.
(Previously Announced)
In the event that an unplanned outage such as excessive continuous
operation in old plants and a sudden increase of power demand due to
unusual hot temperature occur, there is a possibility to affect a stable
power supply. In order to maintain the policy of avoiding rolling blackouts,
we steadily implement to install additional power capacity we have planed,
and we continuously do our best efforts to secure supply capacity. 
Appendix: Past Progress (PDF 307KB)
* Revised past progress
