FILE - In this Nov. 20, 2013 file photo, seen through thick protective glass, shows the area where workers sand-blast the large stainless steel tanks used in the vitrification process to rid them of contaminants at the Defense Waste Processing Facility at the Savannah River Site near Aiken, S.C. South Carolina says Nevada's demand for the U.S. government to remove weapons-grade plutonium that was secretly trucked between the two states last year contradicts its claim that moving the radioactive material is dangerous. (AP Photo/Stephen B. Morton,File)
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