Lead Thermal-CFD Engineer for Nuclear Microreactors

Speedrun Talent Network; El Segundo (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Stock plan

Health benefits

Paid parental leave

Education support program

Lunch provided at HQ

Job summary

Radiant in El Segundo, CA seeks a Principal Thermal-Hydraulics Engineer with deep CFD/FEA expertise to set technical direction for Kaleidos reactor simulations. You will lead complex modeling efforts, define validation strategies, and mentor engineers while shaping decisions across reactor systems, cooling, and shielding.

You will collaborate to establish simulation standards, automate workflows, and drive high-consequence analyses with cross-functional teams. Onsite work is required.

Qualifications

• Bachelor’s degree in engineering, physics, or similar field; MS/PhD preferred.
• 10+ years in industry with leadership on complex programs.
• Extensive CFD and finite element knowledge with validation experience.

Responsibilities

• Serve as technical authority for thermal CFD/FEA of Kaleidos reactor systems.
• Define modeling strategy and best practices for turbulent flow and heat transfer.
• Lead model verification/validation and quantify uncertainty for safety decisions.
• Architect automated simulation workflows and tooling to expand capability.
• Develop reduced-order methods with design and test teams.
• Translate analysis to actionable recommendations for leadership.
• Mentor engineers and participate in design/analysis reviews.

Skills

Thermal CFD

Thermal FEA

Turbulent flow modeling

Model verification & validation

Automation scripting

Mentoring engineers

Education

Bachelors in engineering/physics

MS or PhD preferred

Tools

STAR-CCM+

ANSYS Fluent

Siemens NX

Job description

Radiant in El Segundo, CA seeks a Principal Thermal-Hydraulics Engineer with deep CFD/FEA expertise to set technical direction for Kaleidos reactor simulations. You will lead complex modeling efforts, define validation strategies, and mentor engineers while shaping decisions across reactor systems, cooling, and shielding.

You will collaborate to establish simulation standards, automate workflows, and drive high-consequence analyses with cross-functional teams. Onsite work is required.