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Crippled Unit 4 reactor building of Tokyo Electric Power Co., Fukushima Dai-ichi nuclear power plant is seen in Okuma town, 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/Yoshikazu Tsuno, Pool)

Crippled Unit 4 reactor building of Tokyo Electric Power Co., Fukushima Dai-ichi nuclear power plant is seen in Okuma town, 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/Yoshikazu Tsuno, Pool)

A year on, Fukushima nuclear plant in shambles

Japan's tsunami-hit Fukushima power plant remains fragile nearly a year after it suffered multiple meltdowns, its chief said, with makeshift equipment — some mended with tape — keeping crucial systems running.