Thanks for your interest in Oklo!  We are searching for a nuclear criticality safety engineer to join our engineering team.<h2>Position Description:</h2>A nuclear criticality safety engineer at Oklo is responsible for performing criticality safety evaluations for nuclear reactor and fuel cycle facilities.<h3>Specific responsibilities may include:</h3><ul><li>Identifying and evaluating nuclear criticality safety (NCS) hazards for fuel cycle facilities</li><li>Performing criticality safety evaluations (CSEs) to demonstrate subcriticality under normal and credible abnormal conditions</li><li>Developing the criticality code validation report</li><li>Demonstrating compliance with the double-contingency principle</li><li>Documenting criticality hazard analyses, CSEs, and supporting technical information</li><li>Evaluating and implementing controlled parameters for the NCS program</li><li>Developing the criticality accident alarm system and inadvertent criticality emergency response plan</li><li>Performing radiation shielding analysis to demonstrate adequate radiation mitigation</li><li>Supporting development of shielding systems</li><li>Supporting safety basis development and licensing efforts</li><li>Administering the NCS program, methodologies, and management measures</li></ul><h3>Competencies:</h3><ul><li>Knowledge of nuclear science, physics of criticality, and chemistry</li><li>Knowledge of the nuclear fuel cycle and nuclear fuel cycle facility accident scenarios</li><li>Ability to perform criticality calculations by hand or using criticality codes (e.g., SCALE, MCNP) for CSEs</li><li>Familiarity with critical experiments and their purpose</li><li>Knowledge of criticality-specific codes, standards, regulatory requirements, and industry practices for nuclear fuel cycle facilities</li></ul><h3>Minimum Qualifications:</h3><ul><li>Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistry</li><li>Experience performing CSEs as a part of a nuclear facility safety basis</li><li>Proficient with MCNP and SCALE codes</li></ul><h3>Bonus Qualifications:</h3><ul><li>3+ years of experience performing criticality safety evaluations for an NRC licensed fuel cycle facility</li><li>Familiarity with NUREG-1513, NUREG-1520, NUREG/CR-6410, NUREG/CR-6698, and NRC RG 3.71</li><li>Familiarity with ANSI/ANS-8 national standards</li></ul><h3>Who you are:</h3>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 clear scopes or processes or problems arise without clear solutions, you are able to identify it as well as invent ways to solve a problem or fill a need without micromanagement. The successful person in this job will not only be creative, but also enjoy being creative and solving open-ended problems which may change day-by-day.Detail-oriented: This focus is a big part of excellence, consistency, and quality. Even excellent grammar and spelling matter for both good communication as well as the image of the company that we put forward. About Oklo travel requirements:Oklo requires remote employees to travel to headquarters (Santa Clara, CA) twice a quarter annually, based on business or team needs, including attendance at team meetings, off-sites, and other company events or gatherings. About Oklo compensation:$85,000-$165,000 annually.Oklo offers flexible time off, equity, competitive pay, 401k, health insurance, FSA, flexible work hours, and other benefits.We are looking to fill this position immediately! <hr>About Oklo Inc.: Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho 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.<div><h3>Recruitment Fraud Disclaimer</h3>Oklo is aware of recent recruitment fraud attempts targeting job seekers. Please be cautious of anyone claiming to represent Oklo who does not contact you from an official Oklo email address.All legitimate communications from our recruiting team— including application updates, interview requests, and job offers — will come exclusively from an Oklo 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.</div>

Oklo is developing next-generation fission powerhouses to produce abundant, affordable, clean energy at a global scale – starting with the Aurora, which can produce 15 MW of electrical power, scalable to 50 MWe, and operate for 10 years or longer before refueling. Oklo's fast reactors incorporate inherent safety features and can be fueled by recycled waste.Oklo made history with the first advanced reactor site use permit, winning access to recycled fuel, and submitting the first ever advanced reactor combined license application.Our world-class team comes from Fortune 500 and global companies, bringing together expertise and experience from a number of industries, from nuclear power, to aerospace, to automotive, to tech to deliver an advanced energy product.

Nuclear Criticality Safety Engineer

Thanks for your interest in Oklo!&nbsp; We are searching for a nuclear criticality safety engineer to join our engineering team.<h2>Position Description:</h2>A nuclear criticality safety engineer at Oklo is responsible for performing criticality safety evaluations for nuclear reactor and fuel cycle facilities.<h3>Specific responsibilities may include:</h3><ul><li>Identifying and evaluating nuclear criticality safety (NCS) hazards for fuel cycle facilities</li><li>Performing criticality safety evaluations (CSEs) to demonstrate subcriticality under normal and credible abnormal conditions</li><li>Developing the criticality code validation report</li><li>Demonstrating compliance with the double-contingency principle</li><li>Documenting criticality hazard analyses, CSEs, and supporting technical information</li><li>Evaluating and implementing controlled parameters for the NCS program</li><li>Developing the criticality accident alarm system and inadvertent criticality emergency response plan</li><li>Performing radiation shielding analysis to demonstrate adequate radiation mitigation</li><li>Supporting development of shielding systems</li><li>Supporting safety basis development and licensing efforts</li><li>Administering the NCS program, methodologies, and management measures</li></ul><h3>Competencies:</h3><ul><li>Knowledge of nuclear science, physics of criticality, and chemistry</li><li>Knowledge of the nuclear fuel cycle and nuclear fuel cycle facility accident scenarios</li><li>Ability to perform criticality calculations by hand or using criticality codes (e.g., SCALE, MCNP) for CSEs</li><li>Familiarity with critical experiments and their purpose</li><li>Knowledge of criticality-specific codes, standards, regulatory requirements, and industry practices for nuclear fuel cycle facilities</li></ul><h3>Minimum Qualifications:</h3><ul><li>Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistry</li><li>Experience performing CSEs as a part of a nuclear facility safety basis</li><li>Proficient with MCNP and SCALE codes</li></ul><h3>Bonus Qualifications:</h3><ul><li>3+ years of experience performing criticality safety evaluations for an NRC licensed fuel cycle facility</li><li>Familiarity with NUREG-1513, NUREG-1520, NUREG/CR-6410, NUREG/CR-6698, and NRC RG 3.71</li><li>Familiarity with ANSI/ANS-8 national standards</li></ul><h3>Who you are:</h3>A startup person:&nbsp;You aren't driven by titles or hierarchy, and prefer efficiency to excess process.&nbsp; You don't need or expect to have a lot of guidance but you enjoy working in a fast-paced team.&nbsp; If you prefer the culture and feel of a large organization, that is great, but you likely won’t enjoy working with us!&nbsp; There is plenty of important work and plenty of good opportunities with organizations like that.Motivated: You are self-motivated.&nbsp; 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!&nbsp; 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.&nbsp; 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 clear scopes or processes or problems arise without clear solutions, you are able to identify it as well as invent ways to solve a problem or fill a need without micromanagement. The successful person in this job will not only be creative, but also enjoy being creative and solving open-ended problems which may change day-by-day.Detail-oriented:&nbsp;This focus is a big part of excellence, consistency, and quality. Even excellent grammar and spelling matter for both good communication as well as the image of the company that we put forward.&nbsp;About Oklo travel requirements:Oklo requires remote employees to travel to headquarters (Santa Clara, CA) twice a quarter annually, based on business or team needs, including attendance at team meetings, off-sites,&nbsp;and other company events&nbsp;or gatherings.&nbsp;About Oklo compensation:$85,000-$165,000 annually.Oklo offers flexible time off, equity, competitive pay, 401k, health insurance, FSA, flexible work hours, and other benefits.We are looking to fill this position immediately!&nbsp;<hr>About Oklo Inc.: Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho 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&nbsp; 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.<div><h3>Recruitment Fraud Disclaimer</h3>Oklo is aware of recent recruitment fraud attempts targeting job seekers. Please be cautious of anyone claiming to represent Oklo who does not contact you from an official Oklo email address.All legitimate communications from our recruiting team— including application updates, interview requests, and job offers — will come exclusively from an Oklo 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.</div>

Nuclear Criticality Safety Engineer

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Oklo

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