Part of the Donald C. Cook nuclear power plant is seen Friday, June 6, 2014, in Lake Township, Mich. Allison Macfarlane, chairwoman of the U.S. Nuclear Regulatory Commission, visited the the plant and the Palisades plant in Van Buren County's Covert Township on Friday. (AP Photo/The Herald-Palladium, Don Campbell) ** FILE **
Gregory Jaczko, U.S. Nuclear Regulatory Commission chairman, sees no time frame for the Yucca Mountain nuclear waste repository decision. (Associated Press)