This April 9, 2015, file photo shows the south portal of the proposed Yucca Mountain nuclear waste dump near Mercury, Nev.
This April 9, 2015, file photo shows the south portal of the proposed Yucca Mountain nuclear waste dump near Mercury, Nev. John Locher AP
This April 9, 2015, file photo shows the south portal of the proposed Yucca Mountain nuclear waste dump near Mercury, Nev. John Locher AP