Plant chief: Fukushima nuke plant still vulnerable
Japan Nuclear
A worker wearing a protective suit and a full-face mask walks out of rest area at the emergency operation center of tsunami-crippled Fukushima Dai-ichi nuclear power station of Tokyo Electric Power Co., 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)