FILE - In this Feb. 18, 1997 file photo John McGrail, director of the Department of Energy stockpile stewardship program, talks about the $100 million Device Assembly Facility behind him at the Nevada Test Site in Mercury, Nev. Nevada's U.S. senators and Energy Secretary Rick Perry are set to tour the site north of Las Vegas where the federal government is handling weapons-grade plutonium shipped from South Carolina. Aides say the Friday, May 10, 2019, visit to the Device Assembly Facility at the Nevada National Security Site and briefings with Democratic Sens. Catherine Cortez Masto and Jacky Rosen will be closed to the media and public. (AP Photo/Lennox McLendon, File)
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