Associate Criticality Safety Engineer – Active Clearance Required at LLNL

Seniority in posting: senior

Compensation

$121,830 – $154,500/yr

Setup: Hybrid
Location: Livermore, California
Type: Full-time, Part-time, Other
Level: entry
Posted: Sep 28, 2026

Description

Lawrence Livermore National Laboratory is hiring an Associate Criticality Safety Engineer in its Environment, Safety, and Health Directorate to support the design, development, testing, and criticality safety evaluation of nuclear equipment and systems involving fissionable materials. The role includes walk-through inspections, safety-document reviews, technical assignments, data analysis, calculations, training, and travel to Nevada National Security Sites. It requires an active DOE Q-level or Top Secret clearance, a bachelor’s degree in a relevant scientific discipline or equivalent experience, and experience with nuclear facilities, reactor kinetics, radiation transport, and criticality safety. The position offers a hybrid schedule, is a flexible term appointment of up to six years, and pays $121,830 to $154,500 annually.

Required Skills

Criticality safety
Reactor kinetics
Radiation transport
MCNP
Technical calculations
Safety inspections

Additional Information

Minimum Education: Bachelor’s degree in Nuclear Engineering, Physics, or a closely related scientific discipline, or equivalent education and prior relevant experience.
Required Previous Experiences: Academic, internship, research, or work experience in a nuclear facility, reactor, chemical, high-hazard, radiological, or similarly regulated technical environment.
Experience modeling the Inherently Safe Subcritical Assembly and performing pulsed-neutron experiments.
Experience performing reactor kinetics calculations and developing custom radiation transport code modules.
Experience modeling critical and subcritical benchmark experiments in COG, MCNP, or OpenMC.
Preferred Qualifications: Familiarity with radiation transport software such as COG, MCNP, GEANT, or SCALE.
Basic familiarity with DOE orders, national consensus standards, and engineering practices.
Master’s degree in Nuclear Engineering, Physics, or a closely related scientific discipline, or equivalent education and prior relevant experience.
Experience preparing criticality safety evaluations and implementing criticality safety controls.
Knowledge of LLNL policies, procedures, and practices.
Knowledge of DOE STD-3007 and ANSI/ANS-8 Series Consensus Standards.
Translation Company Name: LLNL