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)

  - At 9:30 am on February 3, we started dust sampling at the upper part 
    and at opening section of equipment hatch of Unit 3 Reactor Building 
    and completed sampling at 1:45 pm on the same day. 

  - At 4:12 pm on January 30, we started to transfer accumulated water
    from the basement of Unit 3 T/B to Central Radioactive Waste
    Treatment Facility (Miscellaneous Solid Waste Volume Reduction
    Treatment Building (High Temperature Incinerator Building)) through
    newly installed polyethylene pipes and stopped the transfer at 10:12 
    am on February 3. 

  - At 4:05 pm on January 30, we started to transfer accumulated water
    from the basement of Unit 2 T/B to Central Radioactive Waste
    Treatment Facility (Miscellaneous Solid Waste Volume Reduction
    Treatment Building (High Temperature Incinerator Building)) through
    newly installed polyethylene pipes and stopped the transfer at 10:20 
    am on February 3. 

  - At 12:30 pm on February 3, one of TEPCO's employees and a worker of 
    cooperating companies found ooze at the tank joint of concentration 
    tank of Water Desalinations (reverse osmosis membrane). There was 
    ooze on the surface of concrete foundation on which the tank was set, 
    but it was not in shape of puddle and there has been no leakage to 
    the oceans. 
    We retightened the joint bolt afterwards and confirmed at 2:44 pm on 
    the same day that the ooze from the joint had been stopped. 
    The results of having measured the radiation dose of tank joint with 
    ooze were 0.9mSv/h of γ-ray and 50mSv/h of β-ray (Those of airborne 
    radiation dose are 0.2mSv/h of γ-ray and 7mSv/h of β-ray). 
    As for the leakage, it is so little that it is invisible, but high 
    radiation dose (22mSv/h of γ-ray and 2000mSv/h of β-ray) was 
    confirmed at the gap between the concrete foundation which is just 
    below the joint with ooze and the tank flange. Thus, there must have 
    been drops. The oozed water from the joint is estimated to be 
    concentrated water (saline water) after being treated with Water 
    Desalinations (reverse osmosis membrane). (The radioactivity density 
    of water at the inlet of evaporative concentration facility sampled 
    on December 20, 2011 were 1.2×101Bq/cm3 of cesium134, 1.7×101Bq/cm3 
    of cesium137, and 2.7×105Bq/cm3 of all-β.) 
    After covering the concrete surface with ooze using acrylic boards 
    and stage planks, the radiation dose became 1.0mSv/h of γ-ray and 
    15mSv/h of β-ray. 

  - Newly found water leakage after the latest report (at 4:00 pm on 
    February 2) are as follows: 
    - at header flange of purified water transfer line (line which 
      transfer from purified water tank to common pool) (it was found at 
      around 11:25 am on February 3)  
      (filtrated water*: about a pencil lead) 
      * filtrated water: (water taken from dam) 

  - At 1:24 pm on February 3, we started to inject hydrazine into the 
    Unit 3 spent fuel pool. 

· 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 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 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.

* 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, February 3, 2012) (PDF 396KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress