In this Oct. 3, 2008 file photo, box-shaped six reactors of the Fukushima Dai-Ichi nuclear power plant stand in line intact in Okumamachi in Fukushima Prefecture (state), northeastern Japan. The operator of the stricken nuclear power plant said Wednesday morning, March 16, 2011, a fire has broken out again at its No. 4 reactor unit, bottom left. (Kyodo News)