FILE - In this May 9, 2017, file photo, signs are posted by the Hanford Nuclear Reservation in 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/Manuel Valdes, File)
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