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 occurred at 2:46 pm.
Due to the affect of tsunami accompanied by the earthquake, on each unit 
of 1, 2 and 4 has lost its cooling function of reactor core and as the 
temperature of pressure suppression chamber has exceeded 100°C (which is 
relevant event under the Act on Special Measures Concerning Nuclear 
Emergency Preparedness), Declaration of a Nuclear Emergency Situation was 
issued by the Prime Minister on March 12.
Emergency response measures were taken such as restoration of electric 
motors and recovery of function of residual heat recovery pumps and cold 
shut down has been achieved for each of the unit by March 15. Thereafter, 
emergency response measures had been continuously taken such as 
restoration of power supply functions and diversification of residual 
heat recovery system and we have endeavored to maintain stable cold shut 
down status of the plant.

Implementation status of emergency response measures were confirmed by 
the government that it is in the condition to continuously maintain 
stable cold shut down status of the plant and on December 26, declaration 
of cancellation of a Nuclear Emergency Situation was issued by the Prime 
Minister.

In accordance with the declaration, we will take measures for restoration 
from nuclear emergency to stably maintain cold shut down status of each 
unit and endeavor to enhance stable condition of the plant.

We will announce the plant status as of 3:00 pm of today as stated below 
and with attachment. 
 
‹Unit 1> 
○ Inspection of inside of the primary containment vessel
   At 10:06 am on December 27, for the purpose of determining soundness of 
   reactor primary containment vessel of unit 1 and internal facilities, 
   airlock* for the workers was opened and started sight survey.
   We plan to conduct same inspection for unit 2 and 3 accordingly.
   (Previously announced on December 21 about the results of visual check
    inside the reactor containment vessel of Unit 4)

* airlock for the workers
  hatch to enter into the primary containment vessel 
 
‹Others> 
○ onset of Noro virus to the employee of TEPCO
   On December 26, one of TEPCO's employee who was worked at Fukushima 
   Daini Nuclear Power Station was newly diagnosed as Noro virus. 
   Disinfecting of the working environment was conducted. We will 
   continuously promote disinfection method such as hand washing and 
   gargle. 

Appendix: Plant Status of Fukushima Daini Nuclear Power Station (PDF 11.2KB)