13 Workers Exposed To Radiation At N.M. Nuclear Waste Dump

NPR, Feb. 28, 2014 (emphasis added): CAPTION: A piece of salt is believed to have fallen from a cavern ceiling and crushed drums of waste [...] the most likely scenario is that a huge chunk of salt fell from the ceiling and ruptured a drum or multiple drums of waste.
http://www.npr.org/blogs/thetwo-way/2014/02/28/283773449/13-workers-exposed-to-radiation-at-n-m-nuclear-waste-dump

New Mexico radiation leak raises concerns

 AP, Feb. 28, 2014: Government officials, politicians, the contractors [...] emphasize that all the safety systems designed to react to worst-case scenarios like a ceiling collapse worked.
 http://www.washingtonpost.com/national/energy-environment/nuclear-dump-leak-raises-questions-about-cleanup/2014/02/28/11091436-a043-11e3-878c-65222df220eb_story.html