FILE - In this April 9, 2015, file photo, people walk into the south portal of Yucca Mountain during a congressional tour of the proposed radioactive waste dump near Mercury, Nev., 90 miles northwest of Las Vegas. Nevada wants a federal appeals court to dismiss a bid by the state of Texas to kick-start government funding and licensing for a long-fought plan to entomb the nation's most radioactive waste in the desert outside Las Vegas. (AP Photo/John Locher, File)
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