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)
-In order to switch the facility for water injection to the reactor from
reactor feed water system piping arrangement to electric water-injection
pump placed on a hill, the conventional fire pump was stopped at 3:12pm
on May 21st and electric water-injection pump was started up at 3:15pm
(The amount of water injection is kept approx. 12m3/h).
-At 4:00pm on May 21st, we started to spray water to the spent fuel pool
of Unit 4 by the concrete pumping vehicle (We added hydrazine from 4:23pm
to 7:00pm). We finished spraying at 7:56pm on the same day.
-The transfer of accumulated water in Unit 6 turbine building to a
temporary tank was started at 2 pm on May 21s. The transfer pump was
stopped at 6:00 pm on the same day (approximately 80m3).
-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 8:31pmFukushima 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 139KB)
* Revised past progress
