Fukushima Dai-Ichi nuclear power plant Fukushima Dai-Ichi nuclear power plant

The tsunami flows over sea walls towards TEPCO's Fukushima Daiichi nuclear power plant on March 11, 2011. This photo was taken by Tokyo Electric Power Company. TEPCO/AFP/Getty Images hide caption

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TEPCO/AFP/Getty Images

A levee protects a home surrounded by floodwater from the Yazoo River near Vicksburg, Mississippi on May 18, 2011. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

An aerial view of Chubu Electric Power's Hamaoka nuclear power plant in February 2005. STR/AFP/Getty Images hide caption

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STR/AFP/Getty Images

April 29: An image from video taken by Tokyo Electric Power Co. as robots explored the nuclear reactor building of Unit 1 at the Fukushima Dai-Ichi plant. TEPCO/AFP/Getty Images hide caption

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TEPCO/AFP/Getty Images