Handout photograph shows efforts to spray water into the No. 4 reactor at the Fukushima Daiichi Nuclear Power Plant in northeastern Japan

Efforts to spray water into the No. 4 reactor at the Fukushima Daiichi Nuclear Power Plant, which was struck by an earthquake and tsunami in Tomioka, Fukushima Prefecture, northeastern Japan, are seen in this March 22, 2011 handout photograph released by Tokyo Electric Power Co. REUTERS/Tokyo Electric Power Co./Handout