Nuclear Test Engineer: Core Physics (Onsite)

Radiant; El Segundo, Northern (CA, KY); Hybrid; USD 180,000 - 250,000; Full time

Benefits offered by this job

Stock options

Comprehensive medical plan

One Medical membership

Vision plan

Dental plan

Flexible PTO (on-site and remote)

Job summary

Radiant is seeking a Nuclear Engineer, Core Physics for the 2026 demonstration in El Segundo, CA. The role centers on designing and implementing nuclear-specific testing operations and ensuring safety and objective alignment across test campaigns.

You will work with nuclear engineers to define success criteria and collaborate with systems engineers to implement procedures, training, and control room interfaces. This onsite position demands deep reactor-operations knowledge.

Qualifications

• Bachelor’s degree in nuclear engineering or equivalent.
• 2+ years of reactor operations experience.
• Experience with radiation transport methods (MCNP/OpenMC/Serpent).
• Knowledge of thermal-hydraulic fundamentals.

Responsibilities

• Collect testing requirements, objectives, and success criteria from nuclear engineers.
• Develop procedures that satisfy test requirements within Kaleidos’ operational bounds.
• Perform reactor physics calculations (neutronic and transient analyses) to verify testing.
• Document procedures and support operator training and control room GUI development.

Skills

Reactor operations

Radiation transport methods

Thermal hydraulics

Education

Bachelor's degree in nuclear engineering or equivalent

Tools

MCNP/OpenMC/Serpent

Job description

Radiant is seeking a Nuclear Engineer, Core Physics for the 2026 demonstration in El Segundo, CA. The role centers on designing and implementing nuclear-specific testing operations and ensuring safety and objective alignment across test campaigns.

You will work with nuclear engineers to define success criteria and collaborate with systems engineers to implement procedures, training, and control room interfaces. This onsite position demands deep reactor-operations knowledge.