Corporate Information

Press Release (Feb 11,2012)
Status of TEPCO's Facilities and its services after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (as of 10:00 am, February 11)
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 
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.

* 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)

- As accumulated water containing radioactive materials was found in the 
  trench between Process Main Building and Miscellaneous Solid Waste Volume 
  Reduction Treatment Building (High Temperature Incinerator Building) in 
  Centralized Radiation Waste Treatment Facility (December 18, 2011), 
  inspection of other trenches in the site was commenced from January 11.
  As a result of inspection on February 10, location where accumulated 
  water was found and results of nuclide analysis (preliminary result) are 
  shown below;
  · Unit 6, inside of seawater pipe duct (SW system) 
    I-131:Below detection limit (ND), Cs-134:2.1x10-1Bq/cm3,  
  · Unit 5, inside of seawater pipe duct (SW system) 
    I-131:ND, Cs-134:1.4x10-1Bq/cm3, Cs-137:1.5x10-1Bq/cm3 
  · No6, inside of trench for diesel fuel pipe 
    I-131:ND, Cs-134:2.5x10-1Bq/cm3, Cs-137:3.7x10-1Bq/cm3 
  · Unit 6, inside of pipe duct (b/w pump room and MG set build.) 
    I-131:ND, Cs-134:1.1x10-1Bq/cm3, Cs-137:2.0x10-1Bq/cm3 
  · Unit 6, inside of seawater pipe duct (North side, emergency line) 
    I-131:ND, Cs-134:ND, Cs-137:1.2x10-1Bq/cm3 
  · Unit 6, inside of seawater pipe duct (South side, emergency line) 
    I-131:ND, Cs-134:1.4x10-1Bq/cm3, Cs-137:2.0x10-1Bq/cm3 

- At 1:28 pm on February 10, injection of hydrazine started through the 
  circulating piping line into the spent fuel pool of Unit 4. Stopped on  
  3:05 pm on the same day. 

- At 10:00 am on February 10, started transfer of accumulated water in the 
  underground of turbine building of Unit 6 to temporary storage tank. 
  Stopped on 4:00 pm on the same day. 

- 8:45 am on February 10, started transfer of accumulated water from site 
  banker building to process main building in the centralized waste 
  treatment facility. Stopped on 4:39 pm on the same day. 

- 6:20 pm on February 10, as decrease of water injection rate into reactor  
  of Unit 2 was observed, adjustment was made from approx.6.3m3/h to  
  approx. 6.8m3/h for feed water system and from approx. 6.6m3/h to approx.  
  6.7m3/h for core spraying system. 

- 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.68.5°C (as of  
  5 am on February 11). 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 10:00 am on February11, 2012) (PDF 673KB) 
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB) 

* Revised past progress 
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