This May 31, 2019, file photo shows the south portal to a five mile tunnel in Yucca Mountain, 9 …

This May 31, 2019, file photo shows the south portal to a five mile tunnel in Yucca Mountain, 9 ...

This May 31, 2019, file photo shows the south portal to a five mile tunnel in Yucca Mountain, 90 miles northwest of Las Vegas. (K.M. Cannon/Las Vegas Review-Journal) @KMCannonPhoto