Join to apply for the Nuclear Engineer role at Radiant 5 days ago Be among the first 25 applicants Join to apply for the Nuclear Engineer role at Radiant Get AI-powered advice on this job and more exclusive features. Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios. Nuclear Engineer Radiant is seeking a highly motivated nuclear engineer responsible for developing nuclear engineering solutions for our Kaleidos microreactor. This may include nuclear engineering areas such as radiation shielding, criticality safety, accident dose consequence, reactor physics modeling and design, transient analysis, and radiation detection. You will lead and own nuclear engineering initiatives and studies, strategic direction, and work closely with a collaborative nuclear and engineering team in a fast-paced startup environment. The ideal candidate is passionate about advanced reactor design, detail-oriented, effectively communicates, and a tenacity to solve interesting technical challenges. Responsibilities & Duties Ownership of Nuclear design and analysis, examples include: Shielding: Operational dose and shutdown activation analysis, waste categorization, and alignment of shielding design to customer and regulatory requirements Neutronics: Analysis of ex-vessel reactor fluxes and energy deposition, criticality safety, and verification and validation (V&V) of the nuclear toolbox and reactor models Accident and Dose Consequence: Radiological dose consequence from different accident scenarios for the Kaleidos demonstration and production units Transient Analysis: Run coupled neutronics and thermal calculations to further understanding of the reactor dynamics of the Kaleidos reactor design Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Other nuclear design and analysis duties as assigned Required Qualifications & Skills Bachelor’s degree in nuclear engineering or equivalent degree from an accredited institution 1-2+ years of nuclear engineering industry experience (MS equivalent to 2 yrs). Experience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent Proficient in at least one of the following programming languages: Python, C++, C#, FORTRAN, or another scientific computing language Basic knowledge of thermal hydraulic principles. Self-motivated with strong organizational, written, and oral communication skills Experience working in an engineering organization and developing high-quality work Desired Qualifications & Skills Experience with variance reduction techniques and associated software (Attila4MC and/or ADVANTG) is a plus Strong experience with OpenMC, Serpent, MCNP, Attila4MC, MOOSE, RELAP, Pronghorn, GRIFFIN, or other similar nuclear software packages Competency in distributed software development processes and high-performance computing environments Familiarity with CAD design software (NX, SolidWorks, and/or SpaceClaim) is a plus Familiarity with dose consequence methods and software such as MAACS or NRC-RADTRAN At least 1 year of software development or scripting experience Hands-on experience designing hardware and/or performing tests Additional Requirements Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Employee Benefits For Eligible Employees Stock: Substantial incentive stock plan for all full time, salaried employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits. Free snacks and drinks onsite. Flexible PTO policy. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Seniority level Seniority level Entry level Employment type Employment type Full-time Job function Job function Management and Manufacturing Industries Nuclear Electric Power Generation Referrals increase your chances of interviewing at Radiant by 2x Sign in to set job alerts for “Nuclear Engineer” roles. 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