On March 11th 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 11th).  

At 7:15 pm on March 15th, 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 15th).  

As of 4:00 pm on April 21st, the reactors of Unit 1 to 4 are in cold
shutdown (please refer to the appendix). We continue to make our
endeavors to stabilize each plant.

 ·The update is an underlined part of the appendix. 

appendix:TEPCO Plant Status of Fukushima Daini Nuclear Power Station 
         (as of 4:00 pm April 21st)(PDF 17.7KB)