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 August 29, the reactors of Unit 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> 
 ○Investigation of reactor containment vessel of unit 4 and inside 
   facilities   
   At 10:15 am on 29th August, in order to investigate soundness of 
   reactor containment vessel of unit 4 and inside facilities, we have 
   opened airlock for site workers (hatch to enter into the primary 
   containment vessel), and we started investigation. 
   We are planning the same investigation of Unit 1 to 3.

 
 ○Poor physical condition of a site worker of co-operating company 
   On 29th August, in the heater building*1 of unit 4, condition of a 
   site worker of co-operating company who was in charge of rerouting of 
   temporary cable was getting worse, at around 10:50 am, and as heat 
   stroke was anticipated, we treated drip infusion and at 11:26 am 
   transferred to J-village by our ambulance. 
   At 11:58 am, patient was transferred to Iwaki Kyoritu Hospital by 
   ambulance.   
   It is under medical treatment in the hospital.   
   No radioactive material attached to the body was found.

   *1 Heat exchanger building       
       The building in which the heat exchanger is installed. The heat 
       exchanger is the facility for carrying out heat exchange of the 
       cooling water of the facility used in reactor containment vessel, 
       turbine building and centralized waste treatment facility. (Non- 
       Controlled Area) 

Appendix: TEPCO Plant Status of Fukushima Daini Nuclear Power Station   
                                                         (PDF 15.4KB)