Reactor Operations Engineer, Nuclear
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.
Reactor Operations Engineer, Nuclear
Radiant is a seeking a nuclear engineer responsible for designing and implementing nuclear-specific testing operations at our 2026 demonstration. You will be responsible for the design of a large portion of the test campaign, which includes providing analysis to verify that the proposed testing is both safe and meets the test’s objectives. This position will work closely with nuclear engineers to establish test success criteria and systems / operations engineers to implement written procedures.
Responsibilities and Duties:
Collect testing requirements, objectives, and success criteria from nuclear engineers.
Develop procedures that satisfy test requirements within the operational bounds of Kaleidos.
Perform various reactor physics calculations (neutronic and transient analyses) to verify proposed testing sequence addresses all requirements.
Document testing procedures and support operator training and control room GUI development.
Required Skills and Qualifications:
Bachelor’s degree in nuclear engineering or equivalent degree from an accredited institution.
2+ years of experience with reactor operations.
Experience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent.
Knowledge of thermal hydraulic fundamentals.
Desired Skills and Qualifications:
4+ years of experience with reactor operations.
Direct experience as a reactor operator of an existing nuclear reactor.
Hands-on experience in developing technical procedures, human factors engineering, or operational interface design.
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.
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 , , , , , or expression, , , , 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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