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Preliminary Notice of Violation, Los Alamos National Laboratory, LLC - NEA-2011-01

April 15, 2011

Preliminary Notice of Violation issued to Los Alamos National Security, LLC related to Unanticipated Extremity Exposures at the Los Alamos National Laboratory

This letter refers to a U.S. Department of Energy (DOE) investigation into the facts and circumstances surrounding the unanticipated extremity exposures that occurred at Technical Area (TA)-48 and TA-53 on July 24, 2009, at the Los Alamos National Laboratory. The final special dose assessments documenting the details of these exposures were completed on January 26, 2010. The Office of Health, Safety, and Security's Office of Enforcement transmitted the results of the investigation to Los Alamos National Security, LLC (LANS), in an Investigation Report dated August 18, 2010. An enforcement conference was held on September 30, 2010, with you and members of your staff to discuss the report's findings and the LANS corrective action plan. A summary of the conference is enclosed.