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 1:24 pm on February 3, we started to inject hydrazine into the Unit 3
 spent fuel pool and completed it at 3:07 pm on the same day. 
 
-At 10:00 am on February 3, we started to transfer accumulated water from 
 the basement of Unit 6 T/B to the temporary tanks and stopped at 4:00 pm 
 on the same day. 

-At 4:07 pm on February 3, 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)). 

-To improve reliability of water injection to the reactors, the injection
 line connecting to the reactor injection pump on the hill was replaced
 with polyethylene pipes and we have been changing the route for reactor 
 injection from feed water system to reactor core spray system in a 
 stepwise manner. After completion of adjusting water flow amount as 
 planned on February 2, tendency of temperature rise at the bottom of PCV 
 was observed. Thus, at 7:20 pm on February 3, we changed the injection 
 amount into Unit 2 reactor through feed water system from approx. 2.9 m3/h 
 to approx. 4.9 m3/h and changed that though reactor core spray system from 
 approx. 5.8 m3/h to approx. 3.8 m3/h (which means setting them at those of 
 before flow adjustment on February 1). As for the temperature rise, the 
 temperature at the upper head of the bottom of PCV has risen to approx. 
 66.8 °C at the highest (as of 7 am on February 4), but currently, it is 
 approx. 64.8°C*1 (as of 11 am on February 4). The trend of the 
 temperature rise seems to be steady and we will monitor it continuously. 

-As the change in injection amount into Unit 1 reactor was observed at 
 7:20 pm on February3, we adjusted the water injection amount through feed 
 water system from approx. 4.7 m3/h to approx. 4.5 m3/h (water injection 
 amount through reactor core spray system*2 keeps at approx. 2.0 m3/h). 
 The injection amount into Unit 3 reactor through reactor core spray 
 system was adjusted from approx. 5.5 m3/h to 6.0 m3/h (water injection 
 amount through feed water system keeps at approx. 3.0 m3/h). 


·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.


*1: It was described as "66.3°C", but the correct description is "64.8°C."
*2: It was described as "feed water system", but the correct description
    is "reactor core spray system."
    We apologize for the incorrect description and correct them herewith.

* 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 11:00 am, February 4, 2012) (PDF 400KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress