Nuclear Criticality Safety Engineer

Thanks for your interest in Oklo! We are searching for a nuclear criticality safety engineer to join our engineering team.Position Description:A nuclear criticality safety engineer at Oklo is responsible for performing criticality safety evaluations for nuclear reactor and fuel cycle facilities.Specific responsibilities may include:Identifying and evaluating nuclear criticality safety (NCS) hazards for fuel cycle facilitiesPerforming criticality safety evaluations (CSEs) to demonstrate subcriticality under normal and credible abnormal conditionsDeveloping the criticality code validation reportDemonstrating compliance with the double-contingency principleDocumenting criticality hazard analyses, CSEs, and supporting technical informationEvaluating and implementing controlled parameters for the NCS programDeveloping the criticality accident alarm system and inadvertent criticality emergency response planPerforming radiation shielding analysis to demonstrate adequate radiation mitigationSupporting development of shielding systemsSupporting safety basis development and licensing effortsAdministering the NCS program, methodologies, and management measuresKnowledge of nuclear science, physics of criticality, and chemistryKnowledge of the nuclear fuel cycle and nuclear fuel cycle facility accident scenariosAbility to perform criticality calculations by hand or using criticality codes (e.g., SCALE, MCNP) for CSEsFamiliarity with critical experiments and their purposeKnowledge of criticality-specific codes, standards, regulatory requirements, and industry practices for nuclear fuel cycle facilitiesMinimum Qualifications:Bachelors, Masters, or PhD in nuclear engineering, chemical engineering, or chemistryExperience performing CSEs as a part of a nuclear facility safety basisProficient with MCNP and SCALE codesBonus Qualifications:3+ years of experience performing criticality safety evaluations for an NRC licensed fuel cycle facilityFamiliarity with NUREG-1513, NUREG-1520, NUREG/CR-6410, NUREG/CR-6698, and NRC RG 3.71Familiarity with ANSI/ANS-8 national standardsWho 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 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.$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!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.Apply for this job*indicates a required fieldFirst Name *Last Name *Email *Phone *Resume/CV *Enter manuallyAccepted file types: pdf, doc, docx, txt, rtfEnter manuallyAccepted file types: pdf, doc, docx, txt, rtfLinkedIn ProfileWebsiteAre you legally authorized to work in the United States? * Select...Will you now or in the future require sponsorship for employment visa status? * Select...Export Control Question: * Select...The questions in this section are for the sole purpose of ensuring compliance with U.S. regulations concerning the export of controlled or protected technologies or information, including 10 CFR Part 810 and 15 CFR Parts 730-774. Oklo is required to obtain answers to these questions from job applicants to ensure Oklo's compliance with these export regulations. If you are a U.S. Person, the export control regulations will not limit the technical information that Oklo can share with you after you start work. If, however, you are not a U.S. Person, the export control regulations may restrict the technical information to which we can give you access until and unless Oklo acquires an export authorization or license from the US government. If you are offered a position, it will be dependent on Oklo being able to satisfy all of the applicable export control requirements for your position, including acquiring any necessary export authorizations or licenses from the US government.Please identify yourself as one of the following A, B, or C as describedbelow: *________________________________________________________________________A . U.S. Person, which is defined for export control purposes as either:a U.S. national (one born in American Samoa or the Commonwealth of the Northern Mariana Islands)a U.S. lawful permanent resident (commonly referred to as a “green card holder”), ora protected person under the Immigration and Nationality Act (such as an individual who the U.S. government has granted asylum or refugee status)________________________________________________________________________B . Nota U.S. Person, as defined above,andaffiliation as a citizen, national, or permanent resident ofonlycountries listed in List Ibelow.This list is derived from 10 CFR Part 810, Appendix A, which is linked here . Because the U.S. government can change this list of countries at any time, please use the link to view the regulations in Appendix A instead of relying on the list below.List IAustraliaGermanyPolandAustriaGreecePortugalBulgariaIrelandCanadaItalySouth AfricaColombiaJapanSpainCroatiaKorea, Republic ofSwedenCyprusLithuaniaTurkeyEgyptUnited Arab EmiratesMoroccoUnited KingdomFinlandNetherlandsVietnamFranceNorwayThe questions in this section are for the sole purpose of ensuring compliance with U.S. regulations concerning the export of controlled or protected technologies or information, including 10 CFR Part 810 and 15 CFR Parts 730-774. Oklo is required to obtain answers to these questions from job applicants to ensure Oklo's compliance with these export regulations. If you are a U.S. Person, the export control regulations will not limit the technical information that Oklo can share with you after you start work. If, however, you are not a U.S. Person, the export control regulations may restrict the technical information to which we can give you access until and unless Oklo acquires an export authorization or license from the US government. If you are offered a position, it will be dependent on Oklo being able to satisfy all of the applicable export control requirements for your position, including acquiring any necessary export authorizations or licenses from the US government.Please identify yourself as one of the following A, B, or C as describedbelow: *________________________________________________________________________A . U.S. Person, which is defined for export control purposes as either:a U.S. citizena U.S. national (one born in American Samoa or the Commonwealth of the Northern Mariana Islands)a U.S. lawful permanent resident (commonly referred to as a “green card holder”), ora protected person under the Immigration and Nationality Act (such as an individual who the U.S. government has granted asylum or refugee status)________________________________________________________________________B . Nota U.S. Person, as defined above,andaffiliation as a citizen, national, or permanent resident ofonlycountries listed in List Ibelow.This list is derived from 10 CFR Part 810, Appendix A, which is linked here . Because the U.S. government can change this list of countries at any time, please use the link to view the regulations in Appendix A instead of relying on the list below.List IAustraliaGermanyPolandAustriaGreecePortugalBelgiumHungaryRomaniaBrazilIndonesiaSlovakiaBulgariaIrelandSloveniaCanadaItalySouth AfricaColombiaJapanSpainCroatiaKorea, Republic ofSwedenCyprusLatviaSwitzerlandCzech RepublicLithuaniaTaiwanDenmarkLuxembourgTurkeyEgyptMaltaUnited Arab EmiratesEstoniaMoroccoUnited KingdomFinlandNetherlandsVietnamFranceNorway__________________________________________________________________________C. Nota U.S. Person, as defined in A above,andnot a citizen, national, or permanent resident ofonlycountries listed inList Iin B, above.________________________________________________________________________Please identify yourself as one of the following A, B, or C as described above: *Oklo encourages employees to travel twice a quarter annually to either headquarters or another designated location based on team/company needs or events. Are you willing/able to travel twice a quarter annually? * Select...Are you open to relocating now or in the near future? * Select... #J-18808-Ljbffr

Created: 2025-09-17