Los Alamos National Lab

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FILE - This May 10, 2014 file photo provided by the Waste Isolation Pilot Plant shows torn and open bags of magnesium oxide on top of standard waste boxes at the WIPP site in Carlsbad, N.M. Workers at a West Texas nuclear waste disposal site are closely monitoring containers from Los Alamos National Lab, Tuesday, May 20, 2014, a day after New Mexico officials announced a type of kitty litter is believed to have caused a radiation leak at the federal government's troubled nuclear waste dump. (AP Photo/Waste Isolation Pilot Plant, File)