FILE - This Nov. 12, 2011, file photo, shows workers in protective suits and masks as they wait to enter the emergency operation center at the crippled Fukushima Dai-ichi nuclear power station in Okuma, Japan. A U.S. science advisory report says a key lesson from Japan's Fukushima nuclear accident is that the nation's nuclear industry needs to focus more on the highly unlikely but super-serious worst case scenarios and radiation traveling further than previously figured. (AP Photo/David Guttenfelder, File)
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