Radiant
Senior Nuclear Thermal-Hydraulics Engineer
$140K–$197K
El Segundo, CA · On-site · Senior · Full-time · Posted Aug 7, 2026
- Experience
- 5+ years of relevant industry or national laboratory experience.
- Education
- Bachelor's degree in nuclear engineering, mechanical engineering, physics, or similar field from an accredited institution.
- Visa sponsorship
- Any job offer is contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.
About the job
Leads thermal-hydraulics and coupled-physics analysis for the Kaleidos microreactor to inform reactor design, cooling systems, and safety-case development.
What you'll do
- Analyze reactor-system design and safety performance under normal and accident conditions, and develop coupled models integrating thermal-hydraulics with neutronics and/or structural response.
- Establish best practices for thermal-hydraulics and systems-code analysis, and build automated simulation workflows.
- Collaborate with reactor physics, mechanical, and safety teams on licensing and design trade studies.
What they ask for
- Bachelor's degree in nuclear engineering, mechanical engineering, physics, or a similar field from an accredited institution.
- Experience with thermal-hydraulics analysis and/or reactor systems codes.
- Experience with high-temperature (500°F+) heat-transfer analysis involving conduction, convection, and radiation.
- Experience communicating technical information with cross-functional teams.
Nice to have
- Experience with coupled multiphysics modeling or neutronics coupling; commercial CFD/FEA tools and CAD.
- Prior experience at a national laboratory, reactor vendor, or advanced reactor developer.
Pay
$139,500 – $196,875 USD total compensation (base salary and equity; posting does not specify the split)
Tools
RELAP5, TRACE, CTF/COBRA-TF, SAM, TRANSFORM, MOOSE, BISON, MARMOT
Model-written summary · the original posting is authoritative