Senior Nuclear Thermal-Hydraulics Engineer - Radiant Industries

You will lead thermal-hydraulics and coupled physics analysis for the Kaleidos microreactor, owning the models that determine heat, coolant, and core interactions under normal and accident conditions. This role sits on the reactor engineering team at Radiant Industries, working alongside reactor physics, mechanical, and safety engineers to support licensing and design trade studies. With a first-of-its-kind reactor moving to test at the Idaho National Laboratory and customer deliveries beginning in 2028, your work directly shapes safety case development for the first mass-produced nuclear reactor. This is a hands-on technical role in a fast-moving startup environment, where your analysis will inform core design and cooling system decisions.

Radiant seeks a driven Senior Thermal Analyst to lead thermal CFD analysis for the Kaleidos microreactor. You will design and execute simulations to ensure high fidelity reliability and safety across reactor systems. This role drives milestones toward commercialization of the first mass-produced nuclear reactor.

Radiant seeks a Senior Structural Engineer to design critical structures for the Kaleidos reactor. You will solve challenges creating efficient reliable structures that survive extreme temperatures and meet volumetric constraints. This role impacts fueling the first commercial reactor design since 1976 by 2026.

Radiant seeks a Lead Nuclear Engineer to lead nuclear design and analysis for the Kaleidos microreactor. You will own schedule budget and execution while focusing on safety reliability and performance. This role drives the first portable nuclear microreactor to market.

You will own thermal CFD analysis for the Kaleidos microreactor, a 1-megawatt portable nuclear reactor targeting rapid deployment. You will use STAR-CCM+ and Ansys Fluent to model turbulent flow, heat transfer, and multi-physics interactions, ensuring high fidelity and safety across reactor systems. Working with cross-functional teams in El Segundo, you will drive simulation workflows and reduced-order methods to accelerate commercialization. This role stands out for its direct impact on the first mass-produced microreactor, with a path to test at Idaho National Laboratory.

Radiant seeks a Senior Structural Engineer to design critical structures for the Kaleidos reactor. You will own mass-efficient transportable shielding systems and high temperature graphite and metallic systems. This role drives structural solutions that survive extreme temperatures and meet volumetric constraints. Your work will enable the first new commercial reactor design since 1976.