The National Nuclear Security Administration (NNSA) issued a Preliminary Notice of Violation (PNOV) to Los Alamos National Security, LLC (LANS) for a March 2013 event in which five LANS workers were exposed to chlorine during a job scoping activity at the Los Alamos National Laboratory. The NNSA considered the event to be of high safety significance, finding that the aggregate of the deficiencies represented conditions that had the potential to cause serious physical harm to workers. The PNOV cited two Severity Level I violations with a total base civil penalty of $150,000. However, because NNSA had already significantly reduced contract award fees for safety and operations deficiencies that were factors in this incident, NNSA did not impose a civil penalty.