FILE--In this file photo taken June 13, 2017, the Plutonium Uranium Extraction Plant, right, stands adjacent to a dirt-covered rail tunnel, left, containing radioactive waste, amidst desert plants on the Hanford Nuclear Reservation near Richland, Wash. The U.S. Department of Energy says there is a high risk that a second tunnel filled with radioactive waste might collapse on the Hanford site. This section of tunnel partially collapsed at the site, forcing some 3,000 workers to seek shelter for a few hours. (AP Photo/Nicholas K. Geranios, file)