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 4 to 6: outage due to regular inspections before the earthquake)

- From February 2, tendency of temperature rise at the bottom of PCV has
  been observed. While we increased the water injection to the reactor and
  have been monitoring the trend of the temperature, it is still high
  around 70°C. On February 6, we sampled the gas by the gas control system
  of Unit 2 Primary Containment Vessel. The density of Xenon 135 at the
  entrance of the system was below the detection limit. Since it is below
  1Bq/cm3, which is the threshold for judging re-criticality, we confirmed
  the reactor didn't go re-critical, however, in order to avoid the 
  possibility of going re-critical being increased as a result of the 
  water density in the reactor being increased by rapid injection of cold 
  water is increased, we injected the boric acid into the reactor as a
  safety countermeasure from 0:19 am to 3:20 am on February 7, which was
  before we increased the volume of the water injection. At 4:24 am on the
  same day, we changed the amount of the core spray system injection water
  from 3.7m3/h to 6.7m3/h (the amount of the continuing feed water system
  injection is 6.8m3/h). Currently, the temperature is approx.66.0°C (as 
  of 11 am on February 8). We will monitor the progress continuously. 
- Approximately on 9:40 am on February 8, the staff of a partner company 
  found the water in a temporary tank to the east of Unit 2 Turbine 
  Building overflowing. At that time we were pumping up the water in the 
  sub-drain to the temporary pool as a trial, thus on 10:15 am on the same 
  day we stopped the pump, and the overflow was stopped. Later we 
  investigated the site and confirmed that there was no water in trenches 
  nearby, therefore we concluded that the water didn't run into trenches 
  nor flow out into the sea. We also sampled the water in the tank. The 
  results of nuclide analyses were Cs-134: 3.4 x 10-1Bq/cm3, Cs-137: 5.2 x 
  10-1Bq/cm3. These results are the same as those of the water in the 
  sub-drain sampled today, therefore we concluded that the overflowed 
  water was the water in the sub-drain. The volume of the water overflowed 
  from the tank is under evaluation. 
 
· 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 the facilities damaged by the
  earthquake are now being handled in a timely manner. 

[Hydro Power Station] 
· Power supply has returned to normal and the facilities damaged by the
  earthquake are now being handled in a timely manner. 

[Impacts on Transmission Facilities] 
· Power supply has returned to normal and the 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 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 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 3:00 pm, February 8, 2012) (PDF 614KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress