In this Nov. 12, 2011 file photo, the Unit 4 reactor building of the crippled Fukushima Dai-ichi nuclear power station is seen through a bus window in Okuma, Japan, when the media were allowed into Japan's tsunami-damaged nuclear power plant for the first time since the March 11 disaster. Japan's tsunami-hit Fukushima power plant remains fragile nearly a year after it suffered multiple meltdowns, its chief said Tuesday, March 6, 2012, with makeshift equipment, some mended with tape, keeping crucial systems running. (AP Photo/David Guttenfelder, Pool, File) Photo: David Guttenfelder, Associated Press / AP Pool