FILE - In this Nov. 20, 2013 file photo, radioactive waste, sealed in large stainless steel canisters, is stored under five feet of concrete in a storage building at the Savannah River Site near Aiken, S.C. U.S. Energy Secretary Rick Perry is pledging to expedite the removal of weapons-grade plutonium his agency secretly shipped to Nevada last year, beginning in 2021. Perry said in an April 24, 2019 letter to Nevada Sen. Catherine Cortez Masto, made public on Tuesday, April 30, that DOE intends to complete the removal of one-half metric ton (1,102 pounds) of the highly radioactive material from Nevada by the end of 2026. (AP Photo/Stephen B. Morton, File)
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