GAO's study found that Energy Secretary Steven Chu's decision to terminate the Yucca Mountain repository program was made for policy reasons, not technical or safety reasons, and officials speaking for Chu in 2010 did not cite any technical concerns or safety issues related to the Yucca Mountain site.
The Energy Department moved to pull its application to develop the site from NRC last year, but the commission's Atomic Safety Licensing Board ruled in June that the government could not pull the application unless Congress directed otherwise. DOE appealed the board's decision to the full NRC panel, and the agency is in the process of making a recommendation on whether or not the government can pull its application. Under NRC procedures, the results of a vote are not made public until staff guidance is developed based on the votes and the commission passes a final order.
When DOE moved to shutter the project last year, Chu did not say Yucca Mountain was unsafe or that there were flaws in the license application, according to the report, but said the site was not a workable option and that alternatives should be found.
(I think Chu is gone from the DOE, but the Administration is behind the DOE stalemate.)
http://www.nytimes.com/gwire/2011/05/10/10greenwire-gao-death-of-yucca-mountain-caused-by-politica-36298.html?pagewanted=all