On March 11 2011, turbines and reactors of Fukushima Daini Nuclear Power
Station Units 1 to 4 (Boiling Water Reactors, rated output 1,100Megawatts)
that we had been constantly operating at rated thermal output were
automatically shut down at 2:48 pm due to the Tohoku-Chihou-Taiheiyou-Oki
Earthquake.
                                                   (Announced on March 11)
 
At 7:15 am on March 15, the reactor of Unit 4 achieved cold shutdown. As a
result, all reactors of Units 1 to 4 at Fukushima Daini Nuclear Power
Station achieved cold shutdown.
                                                   (Announced on March 15)
 
As of 3:00 pm on December 20, the reactors of Units 1 to 4 are in cold
shutdown (please refer to the appendix for each reactor status).
We will continue to make our endeavors to further stabilize each plant of
cold shutdown.

<Updates are underlined> 
○Renewal construction of a permanent building for No.7 monitoring post 
Regarding the monitoring posts (No.1-7) installed at the boundary of the
site, we will renew the temporary building for the measuring equipment of
No.7, starting form today to Dec 20.
Since July, we have conducted monitoring by installing the measuring
equipment in a temporary building, as the old building for No.7 was lost
in the tsunami due to the Tohoku-Chihou- Taiheiyou-Oki Earthquake on March
11, 2011, we decided to enhance the building.
In the period of construction, there is a possibility that measurement
results vary to some extent due to the changes in the radiation condition
around the equipment.
Working dates are subject to change contingent on the weather conditions.
                                                 (Announced on October 25)

The renewal of the No.7 building was completed today.
As a result, on account of the transfer and replacement of detectors etc.,
the monitoring post becomes temporarily unavailable from today to December
21, we will continue monitoring with the remaining six (6) posts.
Working dates are subject to change contingent on the weather conditions.

Appendix: TEPCO Plant Status of Fukushima Daini Nuclear Power Station 
                                                         (PDF 16.1KB)