Fuel Fabrication Criticality Analysis & Nuclear Safety Engineer

Idaho Falls,  Remote

Thanks for your interest in Oklo! We are searching for a Criticality Analysis & Nuclear Safety Engineer to join our engineering team.

As a Criticality Analysis & Nuclear Safety Engineer on Oklo's Fuel Fabrication team, you'll be responsible for developing and maintaining the nuclear criticality safety basis and nuclear safety analyses supporting the design, licensing, construction, commissioning, and operation of advanced nuclear fuel fabrication facilities. You'll perform computational analyses, establish engineered and administrative controls for fissile material operations, and work closely with process, mechanical, operations, licensing, and quality teams to ensure facility designs meet rigorous nuclear safety requirements.

This is a highly cross-functional role where technical excellence and a collaborative mindset are equally valued.

• 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

• 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.

• Experience supporting HALEU, plutonium, or uranium fuel fabrication facilities.
• Experience preparing NRC licensing analyses.
• Knowledge of DOE-STD-3007 and nuclear safety basis methodologies.
• Experience with HAZOPs, accident analysis, or probabilistic risk assessment.
• Familiarity with NQA-1 quality programs.

3–10+ years of experience performing nuclear criticality safety or nuclear safety analyses in fuel cycle, reactor, DOE, national laboratory, or other highly regulated nuclear environments.

• A startup person :
  You aren't driven by titles or hierarchy, and prefer efficiency to excess process. You don't need or expect to have a lot of guidance but you enjoy working in a fast-paced team. If you prefer the culture and feel of a large organization, that is great, but you likely won’t enjoy working with us! There is plenty of important work and plenty of good opportunities with organizations like that.
• Motivated:
  You are self-motivated. You bring an enthusiasm to the team, and imbue a sense of passion that goes beyond clocking in and clocking out. This isn’t about a fake or arbitrary “pieces of flair” mentality or lack of work-life balance! It is about being a part of the vision and feeling a part of reaching team goals.
• A team-player:
  Oklo genuinely is a team. We aren’t about taking credit for ourselves, and we aren’t about…