Regulatory Systems Engineer

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. Portable nuclear power with rapid deploy capability can replace similar-sized diesel generators, and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028. Regulatory Systems Engineer Radiant is seeking a highly skilled Regulatory Systems Engineer to support the regulatory compliance and safety analysis of our cutting-edge reactor demonstrations. You will play a crucial role in ensuring our engineering design and product integration efforts comply with nuclear regulatory requirements. This position will translate technical design information into comprehensive regulatory documentation, performing safety and risk analyses, and managing communications with regulators and stakeholders. This individual requires a deep understanding of nuclear engineering principles, strong analytical capabilities, and exceptional technical writing skills to support the safe and compliant development of Radiant’s reactor systems across their lifecycle. Responsibilities and Duties Translate engineering design and product integration efforts into accurate and comprehensive regulatory documentation that meets the standards of nuclear regulatory bodies, ensuring clarity and compliance. Develop and conduct critical analyses, including: Dose-Consequence Analysis to evaluate radiological impacts. Probabilistic Risk Assessment (PRA) to quantify system risks. Hazards and Operability Studies (HazOp) to identify operational hazards. Process Hazard Analysis (PHA) to assess process-related risks. Failure Modes and Effects Analysis (FMEA) to evaluate potential system failures and their impacts. Manage and respond to Requests for Information (RFIs) from regulatory bodies and stakeholders, ensuring timely, accurate, and professional communication. Develop and implement strategies to manage technical and regulatory risks, ensuring alignment with project objectives and safety requirements. Ensure all documentation associated with Radiant reactor demonstrations is comprehensive, self-consistent, and maintained throughout the system lifecycle, adhering to regulatory and industry standards. Required Qualifications & Skills Bachelor’s or advanced degree in nuclear engineering or a closely related field (e.g., mechanical engineering, chemical engineering, or physics with a nuclear focus) 5+ years of relevant experience Demonstrated experience with multi-physics simulations and transient analysis of reactor systems, including familiarity with tools such as MCNP, RELAP5, or similar software. Experience in nuclear regulatory compliance, safety analysis, or risk assessment (e.g., PRA, HazOp, PHA, or FMEA). Proficiency in performing complex safety and risk analyses, with a focus on nuclear reactor systems. Desired Qualifications and Skills Strong technical writing skills, with the ability to produce clear, concise, and regulatory-compliant documentation. Demonstrated experience interacting with regulators, stakeholders, and cross-functional teams. 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. Total Compensation and Benefits Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications. Benefits and Perks for Eligible Employees: Stock: Substantial incentive stock plan for all full-time 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/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. 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.

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