Corporate Information

Press Release (Aug 04,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 3:00 pm, August 4)
On March 11 2011, Fukushima Daini Nuclear Power Station Units 1 to 4 
(Boiling Water Reactors, rated output 1,100 Megawatts each) that we had 
been operating at rated thermal output shutdown automatically at 2:48 pm, 
due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake
                                       (previously announced on March 11).

At 7:15 am on March 15, the reactor of Unit 4 achieved a cold shutdown. 
As a result, all the Units of Fukushima Daini Nuclear Power Station 
achieved the status of cold shutdown 
                                      (previously announced on March 15). 

As of 3:00 pm on August 3, Units 1 to 4 remain in a cold shutdown (please 
refer to the appendix). 
We will make our best efforts to stabilize each plant.

<Updated items are underlined> 
○Restoration of emergency diesel generator (A)of Unit 4 
 At 8:20 pm on August 3, an emergency diesel generator (A)of Unit 4 was 
○Switching to the Residual Heat Removal System (A) 
 At 12:24 pm on August 2, we finished commissioning of the residual heat 
 removal system (A) of Unit 4, and then, it had been kept in standby 
 condition. At 11:00 pm on August 3, we completed switching from Residual 
 Heat Removal System (B) to (A) 
○Regular inspection of monitoring posts 
 Among monitoring posts (7 in total), which are installed at site boundary, 
 we are implementing a regular inspection for those of No. 1 to 6 from 
 July 29.
 In the period of inspection, although it is impossible to measure 
 radiation dose at inspected monitoring posts, we will continue monitoring 
 and confirming data from remaining 6 ones.
 Inspection dates might be changed due to weather.

(Operation Results of Regular Inspection)
 No. 6: on July 29, from 9:31 am to 6:30 pm 
 No. 1: from 9:21 am, August 2 to 2:30 pm, August 3
  *Slight changes in the data were confirmed before and after the 
  inspection. However, those changes are subject to the adjustments within 
  the range of measurement devices' allowable margin of errors and are not 
  caused by changes in environmental radiation dose or detectors' troubles. 
 No. 3: from9:31 am, August 4, we are conducting an inspection 
Appendix: TEPCO Plant Status of Fukushima Daini Nuclear Power Station 
          (PDF 17.7KB) 
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