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.
This is an exempt salaried role.
Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].
Benefits and Perks for Eligible Employees:
- Stock: Substantial incentive stock plan for all full-time employees.
- Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
- One Medical: Sponsored memberships for eligible employees and their dependents.
- Vision: 100% premium coverage for top tier plan + 50% for dependents.
- Dental: 100% premium coverage for top tier plan (including orthodontia) + 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.
- Burgeoning satellite offices in Oak Ridge, TN and Washington, D.C., near Capitol Hill.
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.
Radiant Nuclear Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Radiant Nuclear and has not been reviewed or approved by Radiant Nuclear.
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Healthcare Strength — Employer materials emphasize fully covered employee medical on base plans, broad vision and dental coverage, and sponsored primary care memberships, which together lift perceived total compensation.
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Equity Value & Accessibility — Equity grants are described as substantial and available to all full‑time employees, providing company‑wide ownership opportunities.
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Wellbeing & Lifestyle Benefits — Day‑to‑day perks such as daily catered lunch, snacks, team events, and some remote‑workday allocation enhance the overall rewards package.
Radiant Nuclear Insights
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What We Do
Radiant is a 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. 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.
Why Work With Us
Our world-class team has prior experience in complex hardware development from SpaceX, McMaster, The Boring Company, and renowned national laboratories that define our mentality to radically improve our microreactors. We care deeply about our mission to reduce carbon emissions, and have fun while doing so from trivia nights to ski retreats.
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