FILE - This March 15, 2011, file image made available from Tokyo Electric Power Company (TEPCO) via Kyodo News, shows the damaged No. 4 unit of the Fukushima Daiichi nuclear power plant in Okuma town, northeastern Japan. A magnitude 9.0 earthquake strikes off the coast at 2:46 p.m. March 11, 2011, triggering a towering tsunami that smashes into the nuclear plant, destroying its power and cooling systems and triggering meltdowns at three reactors. (TEPCO via Kyodo News, File)