FILE - In this June 13, 2017, file photo, demolition work continues on the Plutonium Finishing Plant 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. A tunnel partially collapsed at the site on May 9, 2017, forcing some 3,000 workers to seek shelter for a few hours. (AP Photo/Nicholas K. Geranios, File)
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