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FILE - In this May 9, 2017, file photo, signs are posted by the Hanford Nuclear Reservation in Richland, Wash. By conducting some of the most high-tech research in the world, maintaining the U.S. stockpile of nuclear weapons and cleaning up after decades of bomb-making, the Department of Energy has its share of management challenges. A report released this week outlines some of those challenges while providing a look at the expansive scope of the department's responsibilities and costly liabilities. (AP Photo/Manuel Valdes, File)