← All roles

Fuel Fabrication Criticality Analysis & Nuclear Safety Engineer

Oklo· Fuel Fabrication
Apply on company site
Hybrid (Idaho Falls, ID or Remote)$120k - $190kfull-timePosted 2d ago

About the role

Criticality Analysis & Nuclear Safety Engineer on Oklo's Fuel Fabrication team, responsible for developing and maintaining nuclear criticality safety basis and safety analyses to support design, licensing, construction, commissioning, and operation of advanced nuclear fuel fabrication facilities.

Responsibilities

  • Develop Criticality Safety Evaluations (CSEs) and supporting calculations.
  • Perform criticality analyses using MCNP, SCALE, SERPENT, or equivalent software.
  • Develop nuclear safety analyses including hazard evaluations and accident analyses.
  • Establish fissile material limits, mass limits, geometry controls, moderation controls, and administrative controls.
  • Support facility design reviews to ensure criticality-safe equipment layouts and process designs.
  • Work with process engineers developing HALEU, plutonium, and uranium metal processes.
  • Support NRC licensing documentation and responses to regulatory requests.
  • Participate in HAZOPs, What-If analyses, FMEAs, and design reviews.
  • Develop criticality alarm system requirements and safety basis documentation.
  • Support startup testing, operational readiness reviews, and commissioning.
  • Investigate abnormal conditions and recommend corrective actions.
  • Maintain compliance with ANSI/ANS-8 standards and applicable NRC/DOE requirements.

Qualifications

  • Bachelor's or higher degree in Nuclear Engineering or closely related discipline.
  • Experience performing nuclear criticality or safety analyses.
  • Knowledge of neutron transport methods and computational modeling.
  • Understanding of NRC or DOE nuclear safety requirements.
  • Strong technical writing and communication skills.
  • Ability to work effectively within multidisciplinary engineering teams.

Skills

Required:Criticality safety analysisNeutron transport modelingRegulatory compliance (NRC/DOE)Technical writing
Nice to have:HALEU, plutonium, uranium metal processes

Benefits

  • flexible time off
  • equity
  • bonuses
  • competitive pay
  • 401(k)
  • health insurance (with employer contribution)
  • HSA
  • FSA
  • flexible work hours
  • wellness credits
  • other benefits
Last updated Oct 23, 2026. Interested? Apply on the company site.
Oklo logo

About Oklo

Emission free, always on power from advanced fission power plants.

About Oklo Inc.: Oklo Inc. (Oklo) is developing advanced fission power plants to provide emission-free, reliable, and affordable energy. Oklo received a Site Use Permit from the U.S Department of Energy, has performed successful prototypic fuel fabrication, was awarded fuel material from Idaho National Laboratory, developed the first advanced fission combined license application accepted and docketed by the U.S. Nuclear Regulatory Commission, and is developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and national laboratories. Oklo has been featured in Time, Newsweek, Wall Street Journal, CNBC, Popular Mechanics, Wired, Architectural Digest, Hyperallergic, POWER Magazine, has been the subject of a Harvard Business School case, and is featured in the Oliver Stone documentary Nuclear, among other features.

small-modular-reactorsclimate
Company profileWebsite

More open roles at Oklo