On March 11 2011, turbines and reactors of Fukushima Daini Nuclear Power 
Station Units 1 to 4 (Boiling Water Reactors, rated output 1,100 Megawatts) 
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. 
                                         (previously 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.
                                         (previously announced on March 15)

As of 3:00 pm on October 11, the reactors of Units 1 to 4 are in cold 
shutdown (please refer to the appendix). We will continue to make our 
endeavors to further stabilize each plant of cold shutdown. 

(Underlined are new matters)  
 ○ The replacement work of Monitoring post No.6 
    Among monitoring posts (No.1-7), which are installed at the boundary 
    of the plant site, we are working the replace of No.6 monitoring post 
    from today to Oct 21. 
    We start the replacement work of No.6, which did cover water by the 
    tsunami with the Tohoku-Chihou-Taiheiyou-Oki Earthquake which 
    occurred on March 11 2011 but keeping the soundness of the apparatus 
    and continuing the measurement, for the purpose of the preventive 
    measure. 
    In the period of working, although it is impossible to measure 
    radiation dose in the air at inspected monitoring posts, we will 
    continue monitoring and confirming data from remaining 6 ones. 
    Working dates might be changed due to weather. 

Appendix: TEPCO Plant Status of Fukushima Daini Nuclear Power Station 
                                                          (PDF 126KB)