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 7:10 on February 9, a partner company's worker found that one end of 
  a silt fence of Unit 1 screen came off. The silt fences were installed 
  both inside and outside of the screen, and the one which came off was 
  the inside. At 10:30 am we refitted it. We implemented sampling survey 
  of both silt fences everyday and there was no significant change from 
  today's sample which we took before the incident. 

- With the regular inspection of the residual heat removal system (RHR) at 
  10:14 on February 9, we stopped the RHR. At 2:02 pm, we rebooted the 
  system and restarted the reactor cooling. Due to the suspension, the 
  reactor's water temperature increased from 27.5°C to 30.6°C temporarily, 
  but in terms of the increase level of reactor water temperature, we 
  estimated it no problem. 

- From 10:21 am to 12:35 pm on February 9, for the reliability improvement 
  of nitrogen injection, we are working for installing additional flow 
  meter to the nitrogen injection line of the Primary Containment Vessel 
  (PCV) of Unit 2. Although we suspended the injection temporarily, there 
  is no significant change of the parameter. 
   * In the Chapter 12 of Nuclear Reactor Facilities Security Regulation 
     "The Way of Ensuring Mid-term Security", as the treatments like 
     "Operational limitation" or "Measures required in case of not 
     satisfying the operational limitation" are determined, it is supposed 
     the operator act per the required measures if it fails to satisfy the 
     operational limitation. This time, to implement maintenance works, we 
     suspended the nitrogen injection into the PCV of Unit 2 (from 10:21 
     am on February 9 to 12:35 pm on February 9) by conducting a planned 
     shift beyond the range of operational limitation. 

- The newly found water leakage caused by frost after the previous report 
  (at 3:00 pm on February 3) is as follow: 
  Secondary cooling system air fin cooler of the spent fuel pool 
  alternative cooling system of Unit 4(founded at 2:30 pm on February 9).  
  (Filtrate water* : a drop per approx. 1 second) 
  *Filtrate water: water which takes from dam. 

- 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.66.8°C (as 
  of 11 am on February 9). We will monitor the progress continuously.
 
· 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 9, 2012) (PDF 412KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress