Plant chief: Fukushima nuke plant still vulnerable
Japan Nuclear
Damaged Unit 3, left, and Unit 4, right, reactor buildings are seen at Tokyo Electric Power Co.,'s tsunami-crippled Fukushima Dai-ichi nuclear power station in Okuma, Fukushima prefecture, northeastern Japan, Tuesday, Feb. 28, 2012. Japan next month marks one year since the March 11 tsunami and earthquake, which triggered the worst nuclear accident since Chernobyl in 1986. (AP Photo/Kimimasa Mayama, Pool)