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 4:00 pm on August 6, 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> ○Status of restoration work for Residual Heat Removal System (A), Unit 2 We've been working on the restoration of Residual Heat Removal System (A) which was stopped due the tsunami. At 3:02 pm, August 6 the commissioning work was finished and it is now standby. ○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 data change was observed before and after the inspection
No. 1: from 9:21 am, August 2 to 2:30 pm, August 3
No. 3: from 9:31 am to 6:00 pm, August 4
No. 4: from 9:31 am to 5:40 pm, August 5
*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. 
Appendix: TEPCO Plant Status of Fukushima Daini Nuclear Power Station
(PDF 47.3KB)
