AIKEN, South Carolina, April 26 -- The U.S. Department of Energy's Savannah River Site issued the following news release: The U.S. Department of Energy Office of Environmental Management (EM) has authorized the newest mega-size disposal unit to begin operating at the Savannah River Site (SRS), completing a 2024 priority for the cleanup program. The authorization marks the last step before the Saltstone Disposal Unit (SDU) 9 can begin to receive decontaminated material for disposal. The unit wa  more