Workers in protective suits and masks wait to enter the emergency operation center at the crippled Fukushima Dai-ichi nuclear power station on Nov. 12, 2011.
David Guttenfelder /AFP/Getty Images
This file handout picture shows workers spraying water to cool down the spent nuclear fuel in the fourth reactor building at TEPCO's Fukushima Daiichi nuclear power plant.
TEPCO/via AFP/Getty Images
This handout picture, taken by Tokyo Electric Power Co (TEPCO) shows radioactive water on the floor inside the building of a water treatment facility at TEPCO's Fukushima Daiichi nuclear plant.
Japan's Parliamentary Secretary for the Cabinet Office Yasuhiro Sonoda drinks a glass of decontaminated water taken from puddles inside the buildings housing reactors 5 and 6 at the Fukushima No. 1 plant.