A California laboratory responsible for safeguarding the nation's nuclear arsenal has been cited for a significant security lapse, involving the processing of classified information on unapproved computer systems. The National Nuclear Security Administration (NNSA) issued a preliminary notice this month detailing failures at the Special Technologies Laboratory in Santa Barbara.
One of the security breaches received the Energy Department's highest severity rating, a designation reserved for incidents with actual or high potential for harm to national security. While officials have not disclosed the specific information involved or confirmed unauthorized access, the use of unapproved systems increases the risk of sensitive government secrets reaching unauthorized individuals.
The Special Technologies Laboratory plays a crucial role in U.S. defense, developing technology to ensure the reliability of American nuclear weapons and to detect foreign nuclear weapon programs. The laboratory operates as a specialized facility under the Nevada National Security Sites, funded and overseen by the NNSA.
The operator of the lab, Mission Support and Test Services (MSTS), faces a proposed penalty of $196,350. The NNSA stated that the proposed penalty takes into account corrective actions intended to prevent future incidents, though details on these changes have not been publicly shared.
Federal records indicate the security incident was discovered in March 2024 and was recorded as closed in the Energy Department’s security reporting system on August 5, 2024. MSTS subsequently reported the closure to the department's intelligence and counterintelligence office in February 2025.
Federal investigators conducted a fact-finding review at the Santa Barbara facility between June 10 and June 12, 2025. A formal investigation was launched in September 2025 to examine how classified information was processed on non-approved computer systems and to explore potential broader compliance failures with rules protecting government secrets. MSTS has the option to challenge the findings or seek a reduction in the proposed penalty, with federal rules typically allowing 30 days for a response to the notice.