Senior Nuclear Engineer — Microreactor Design & Analysis

Radiant; El Segundo (CA); On-site; USD 180,000 - 260,000; Full time

Benefits offered by this job

Stock options

Medical plan

One Medical

Vision coverage

Dental coverage

Parental leave

Education program

Lunch program

Remote workdays

Team events

Job summary

Radiant in El Segundo, CA seeks a Staff Nuclear Engineer to provide technical leadership across design and analysis of Kaleidos. You’ll own models from requirements through verification, mentor engineers, and interface with reactor engineering to close complex problems.

You will translate analytical results into practical requirements for core, shielding, and controls, collaborating with safety, regulatory, and operations teams to ensure robust reactor performance.

Qualifications

• Bachelor’s degree in nuclear engineering or a related technical discipline.
• 8+ years of relevant nuclear engineering experience across reactor design, analysis, testing, licensing, safety, or operations.
• Demonstrated experience owning complex nuclear engineering projects involving multiple technical disciplines and stakeholders.
• Deep knowledge of neutron transport theory, Monte Carlo simulation methods, nuclear data, and statistical convergence.

Responsibilities

• Provide technical leadership across reactor physics, core performance, shielding, dose and activation, thermal-hydraulics, safety analysis, I&C, and reactor operations.
• Own complex nuclear engineering projects from requirements capture and design iteration through model development, analysis, technical review, and final documentation.
• Perform and guide analyses of criticality, reactivity control, shutdown margin, power distribution, depletion, temperature feedback, radiation transport, dose, activation, and shielding performance.
• Develop, review, and improve high‑fidelity neutron and radiation transport models used to support reactor design, safety, testing, and regulatory evaluations.
• Translate analytical results into actionable requirements and design decisions affecting the core, shielding, control systems, instrumentation, fluid systems, structures, and surrounding hardware.
• Lead multidisciplinary technical trades and evaluate the interaction between nuclear performance, thermal behavior, mechanical design, controls, operations, manufacturability, and safety.

Skills

Neutron transport theory

Monte Carlo methods

MCNP/OpenMC

Reactor physics concepts

Analytical design translation

Model verification & validation

Independent problem solving

Strong communication

Education

Bachelor’s degree in nuclear engineering

Tools

MCNP/OpenMC

Python

Job description

Radiant in El Segundo, CA seeks a Staff Nuclear Engineer to provide technical leadership across design and analysis of Kaleidos. You’ll own models from requirements through verification, mentor engineers, and interface with reactor engineering to close complex problems.

You will translate analytical results into practical requirements for core, shielding, and controls, collaborating with safety, regulatory, and operations teams to ensure robust reactor performance.