In this Nov. 20, 2013 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 contaminates at the Defense Waste Processing Facility at the Savannah River Site near Aiken, S.C. Nevada's latest bid to block incoming shipments of weapons-grade plutonium points to the U.S. Energy Department's own scientific warnings about the dangers of prematurely moving the highly radioactive material out of South Carolina. (AP Photo/Stephen B. Morton)
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