About the role
About Radiant 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, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. 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 leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.
About
the Role Radiant is a seeking a Nuclear Engineer, Core Physics 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 & 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
Qualifications & Skills: 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
