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Criticality Safety Engineer

Posted March 10, 2026
Full-time Mid-Senior Level

Job Overview

We have an opening for a Criticality Safety Engineer. You will contribute to the design, development, and testing of nuclear equipment and systems for Lawrence Livermore National Laboratory (LLNL) operations with fissionable materials.  You will also contribute to projects and task assigned to LLNL supporting the Department of Energy (DOE) Nuclear Criticality Safety Program.  This position is in the Nuclear Criticality Safety Division within the Environment, Safety, and Health (ES&H) Directorate.

This position will be filled at either level based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities (outlined below) will be assigned if hired at the higher level.

This position requires full-time on-site presence due to the nature of the work.

You will 

  • Perform criticality safety evaluations in conformance with DOE-STD-3007 and LLNL administrative procedures and participate in design and reviews of new or proposed changes to existing equipment or operating procedures.
  • Perform walk-through inspections and basic annual reviews of operations and work authorization/work control documents and review safety procedures and documents for consistency with criticality safety evaluations and adequate implementation of criticality safety controls.
  • Perform technical/scientific assignments of moderate to complex problems that require independent analysis and creativity, and provide technical support to facility management, engineers and scientists in scientific research and development projects and/or ongoing operations.
  • Gather and analyze data and information in support of the work activity and deliver results in the form of documents, calculations, recommendations, corrective actions, or designs.
  • Develop creative solutions to problems of moderate complexity, contributing to the fulfillment of project and organizational goals.
  • Frequently travel to the Nevada National Security Sites.
  • Conduct Fundamentals of Criticality Safety training courses.
  • Perform other duties as assigned.

Additional job responsibilities, at the SES.3 level

  • Prepare technical reports and present formal presentations to LLNL management and various internal and external audiences.
  • Conduct formal on-the-job training, informal presentations, and complex consultations of criticality safety information to fissile material handlers, designers, and other clients.
  • Interpret, implement, and provide guidance to internal customers on DOE regulations, national consensus criticality safety standards and Laboratory policies related to criticality safety.

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