Senior Nuclear Criticality Safety Engineer

🏢 Oklo · all Oklo jobs
📍 United States
💰 USD 135,000 - 175,000 / annual
📅 Posted 2026-07-22 · via Himalayas
🏷 Nuclear-Criticality-Safety-Engineer,Nuclear-Safety-Engineer,Senior-Nuclear-Engineer,Nuclear-Facility-Safety-Engineer
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Thanks for your interest in Oklo ! We are searching for a Senior Nuclear Criticality Safety Engineer to join our team.
Position Description

A Senior Nuclear Criticality Safety Engineer at Oklo is responsible for performing criticality safety evaluations, developing the nuclear criticality safety basis, and architecting the nuclear criticality safety program for a first-of-a-kind used nuclear fuel recycling facility.
Specific responsibilities may include:

- Identifying and evaluating nuclear criticality safety (NCS) hazards for fuel cycle facilities

- Performing criticality safety evaluations (CSEs) to demonstrate subcriticality under normal and credible abnormal conditions

- Developing the criticality code validation report

- Demonstrating compliance with the double-contingency principle

- Documenting criticality hazard analyses, CSEs, and supporting technical information

- Evaluating and implementing controlled parameters for the NCS program

- Developing the criticality accident alarm system and inadvertent criticality emergency response plan

- Supporting safety basis development and licensing efforts

- Developing and administering the NCS program, methodologies, and management measures

Minimum Qualifications:

- Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistry, or related field

- Minimum 5+ years experience performing CSEs as a part of a nuclear facility’s safety basis

Bonus Qualifications:

- Knowledge of used nuclear fuel recycling technologies

- 10+ years of experience performing criticality safety evaluations for an NRC licensed fuel cycle facility

Competencies

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

- Knowledge of nuclear science, physics of criticality, and chemistry

- Knowledge of nuclear fuel cycle processes and nuclear fuel cycle facility accident scenarios

- Proficient with Attila4MC, MCNP, SCALE, and/or Serpent codes and modules

- Familiarity with critical experiments and their purpose

- Knowledge of criticality-specific codes, standards, regulatory requirements, and industry practices for nuclear fuel cycle facilities

- Familiarity with NUREG-1513, NUREG-1520, NUREG/CR-6410, NUREG/CR-6698, NUREG/CR-7311, and NRC RG 3.71

- Passionate about clean energy and making advanced fission a reality

- Knowledgeable about structural design, analysis, and construction

- Eager to work on a dynamic team, receive constructive feedback, and grow with us

- Willing to think differently and learn quickly

- Comfortable in a fast-paced, highly iterative startup environment

- Excited to think creatively, critically, and reflectively about the problems they are solving, while not leaning only on what has been done before

- An excellent writer who can communicate technical concepts in modern active voice

Who you are:

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 pushing blame to others. We do incredible things because we work as a team.

An excellent communicator: We need a person who is not only technically competent but also a clear and upbeat communicator.

Creative: Being creative means that when things fall outside

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