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Salary: USD 120,000 - 190,000 / annual
Oklo is seeking a Criticality Analysis & Nuclear Safety Engineer to join the Fuel Fabrication team. In this role, you will develop and maintain the nuclear criticality safety basis and nuclear safety analyses supporting the design, licensing, construction, commissioning, and operation of advanced nuclear fuel fabrication facilities.
Key responsibilities include:
- 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
This is a highly cross-functional role where you will work closely with process, mechanical, operations, licensing, and quality teams. Oklo is a fast-paced startup environment focused on developing fast fission power plants, establishing a domestic supply chain for critical radioisotopes, and advancing nuclear fuel recycling. The company was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant and submitted the first custom combined license application for an advanced reactor to the NRC.
Remote employees are required to travel to headquarters (Santa Clara, CA) twice a quarter annually for team meetings, off-sites, and company events. The first two weeks of onboarding must be completed in person at Santa Clara headquarters.
QUALIFICATIONS:
Minimum:
- Bachelor's degree or higher 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
- 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
Bonus:
- Graduate degree in Nuclear Engineering
- 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
Desired competencies:
- Strong understanding of neutron physics and criticality safety principles
- Experience applying ANSI/ANS-8 standards
- Proficiency with MCNP, SCALE, SERPENT, or equivalent modeling software
- Ability to evaluate complex nuclear process systems and identify credible accident scenarios
- Comfortable working across engineering, operations, licensing, and quality organizations
- Excellent technical writing and presentation skills
- Passionate about clean energy and advanced fission
- Comfortable in a fast-paced startup environment
- Creative, detail-oriented, and committed to nuclear safety culture
