FILE - In this May 11, 2015, file photo, nuclear waste is stored in underground containers at the Idaho National Laboratory near Idaho Falls, Idaho. Scientists say radioactive and chemical contamination in a giant aquifer below an eastern Idaho federal nuclear facility has decreased or remained constant in recent years. A report released earlier this year by the U.S. Geological Survey attributes the decreases to radioactive decay, changes in waste-disposal methods, cleanup efforts and dilution from water coming into the Lake Erie-sized Eastern Snake Plain Aquifer. The contamination originated at an 890-square-mile (2305-square-kilometer) U.S. Department of Energy site that includes the Idaho National Laboratory, considered the nation’s leading nuclear research lab. (AP Photo/Keith Ridler, File)
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