Due to the affect of tsunami accompanied by the earthquake on March 11, 2011, the relevant events under the Act on Special Measures Concerning Nuclear Emergency Preparedness occurred at each of Units 1, 2 and 4 in Fukushima Daini Nuclear Power Station. On March 12 2011, the declaration of a Nuclear Emergency Situation was issued by the Prime Minister.
After that, emergency response measures were taken such as restoring electric motors and recovering the function of residual heat removal pumps. Cold shut down has been achieved for each of the unit by March 15.
Thereafter, those emergency response measures had been continuously taken, and also TEPCO endeavored to maintain stable cold shut down status of the plant, multiplexing power supply function and residual heat removal function. As a result, on December 26, Nuclear Emergency Situation was lifted by the Prime Minister, and TEPCO moved onto the phase to implement the post nuclear disaster incident measurement.
Implementing those countermeasures, TEPCO has established the restoration plan based on the nuclear plant operator's anti- disaster measures operation plan. TEPCO submitted the plan to the Minister of Economy, Trade and Industry, and the governors of Fukushima prefecture, Naraha town, and Tomioka town on January 31, 2012.
TEPCO will continue to restore facilities for the cold shut down of the plants etc based on this plan to improve the reliability further.
We announce the plant status as of 3:00 pm today per the following and the attachment (the updates are underlined parts).
○ Confirmation of contamination by radioactive materials in the Unit 3 and 4 Service Buildings.
At 12:42 pm today, in the Unit 3 and 4 Service Buildings when a TEPCO member was bringing in analysis samples from Fukushima Daiichi Nuclear Power Plant, he confirmed that there was contamination by radioactive materials on a desk beside a small object monitor (non-controlled area) at the checkpoint for the confirmation of contamination of goods for workers exiting from controlled area.
Currently we are investigating the cause of the contamination.
The contaminated desk and other spots where there is a possibility of contamination are partitioned and under control now.(Previously announced March 27, 2012)
Controlled area is the area which requires control for prevention of unnecessary exposure and prevention of increase of radioactive contamination. Non-controlled area is the area other than controlled area.
TEPCO Plant Status of Fukushima Daini Nuclear Power Station (PDF 14.5KB)