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)
- At 3:33 pm, on May 22nd, we began spraying freshwater to the Spent Fuel
Pool of Unit 1 by a concrete pumping vehicle.
- At approx. 2:00 pm, May 21st, nitrogen injection to the vessel was
stopped (The compressor stopped due to "High temperature".) The back-up
supply facility was started up (approx. 20m3/h) at 5:00pm, May 21st. The
amount of nitrogen was increased to approx. 26 m3/h at 8:31pm. At 10:56
am, on May 22nd, we stopped the back-up supply facility. At 11:23 am, we
started the nitrogen gas compressor we planned to use for Units 2 and 3
(increased to approx. 28m3/h).
- From 0:30 pm to 1:50 pm, on May 22nd, we sampled, on a trial basis,
radioactive materials in the ambient air at the opening of the Reactor
Building, Unit 1. We will analyze and evaluate.
- At 1:02 pm on May 22nd, we started injecting freshwater to the spent
fuel pool of Unit 2 by Fuel Pool Cooling and Filtering (Clean up) System
(We added hydrazine from 1:04pm to 2:03pm). We finished injection at
2:40 pm on the same day.Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to the earthquakeKashiwazaki 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 138KB)
* Revised past progress
