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FILE - In this July 9, 2014 file photo, a sign informs visitors of prohibited items on the Hanford Site near Richland, Wash. The U.S. Department of Energy has confirmed that two underground structures at the decommissioned Hanford nuclear reservation in Washington state have been stabilized after they were deemed at risk of collapsing and spreading radioactive contamination into the air. (AP Photo/Ted S. Warren, File)

FILE - In this July 9, 2014 file photo, a sign informs visitors of prohibited items on the Hanford Site near Richland, Wash. The U.S. Department of Energy has confirmed that two underground structures at the decommissioned Hanford nuclear reservation in Washington state have been stabilized after they were deemed at risk of collapsing and spreading radioactive contamination into the air. (AP Photo/Ted S. Warren, File)

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