U.S. Reps. John Shimkus, R-Ill., and Jerry McNerney, D-Calif., talk to the media during a congressional tour of the Yucca Mountain exploratory tunnel Thursday, April 9, 2015. (Sam Morris/Las Vegas …

U.S. Reps. John Shimkus, R-Ill., and Jerry McNerney, D-Calif., talk to the media during a congressional tour of the Yucca Mountain exploratory tunnel Thursday, April 9, 2015. (Sam Morris/Las Vegas Review-Journal)