Fuel Fabrication Criticality Analysis & Nuclear Safety Engineer

The posting, as Oklo wrote it

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

Position Description

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.

Specific responsibilities may 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

Minimum 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.

Bonus Qualifications

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.

Competencies

We are looking for a Criticality Analysis & Nuclear Safety Engineer that is:

Strong understanding of neutron physics and criticality safety principles.

Experience applying ANSI/ANS-8 standards.

Proficient with M
[…]
o National Laboratory, and submitted the first custom combined license application for an advanced reactor to the U.S. Nuclear Regulatory Commission. Oklo is also developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and U.S. National Laboratories.

#CHOP: Oklo’s Values
Collaboration : We go further, together. We bring diverse perspectives, listen actively, and build trust through transparency and respect. We work across disciplines, sharing ownership to turn complex challenges into shared successes.
Humility : We are team players who act for the good of the company and for the world. We are focused on our mission, not personal recognition.
Ownership : We take pride in what we do and how we do it. We are proactive in finding solutions and see tasks through to completion. We are committed to delivering on our promises to provide clean, reliable, and affordable energy.
Pathfinding : We chart new ground where no path exists by approaching challenges with curiosity, courage, and creativity while navigating ambiguity.
Candidates should be aware that employment may be contingent upon successful completion of a drug screening, and employees may be subject to drug testing at any time in accordance with company policy and applicable laws.

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All legitimate communications from our recruiting team— including application updates, interview requests, and job offers — will come exclusively from an @oklo.com email. Oklo will never ask for sensitive personal information, payments, or account credentials during the hiring process.

If you receive suspicious outreach or have concerns about the authenticity of any communication claiming to be from Oklo, please contact us through the official channels listed on our website.