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>
○Regular inspection of monitoring posts
Among monitoring post (total of 7), which are installed at site boundary,
we are implementing regular inspection for No. 1 - 6 (1 monitoring post
per day) from July 29.
In the period of inspection, although it is impossible to measure
radiation dose at such monitoring post, we will continue to measure and
confirm the data by using remainder of 6 monitoring posts.
Inspection date might be changed due to the weather.
(Operation Results of Regular Inspection)
No. 6: July 29, 9:31 am - 6:30 pm in regular inspection
No. 1: August 2, 9:31 am - August 3, 2:30 pm
*Slight changes in the data were confirmed before and after the
inspection of monitoring posts. However, those changes are subject to
the adjustments within the range of measurement devices' allowable
margin of error and are not caused by environmental radiation dose or
detectors' troubles.