January 2024,

Independent Assessment of the Triad National Security, LLC Management of Nuclear Safety Issues at the Los Alamos National Laboratory

The U.S. Department of Energy (DOE) Office of Enterprise Assessments (EA) conducted an independent assessment of the management of nuclear safety issues at the Los Alamos National Laboratory (LANL) in June and July 2023. This assessment evaluated Triad National Security, LLC’s (Triad’s) identification, categorization, correction, and prevention of the recurrence of safety issues in nuclear engineering, conduct of operations, and criticality safety, focusing on those affecting pit production in the Plutonium Facility in Technical Area 55. The National Nuclear Security Administration (NNSA) Los Alamos Field Office’s oversight of Triad’s issues management was also assessed. Additionally, this assessment followed up on significant weaknesses documented in the EA report Assessment of the Management of Nuclear Safety Issues at the Los Alamos National Laboratory, April 2019 (hereafter referred to as the April 2019 EA report).