Principal Nuclear Engineer: Microreactor Design Lead

Radiant; El Segundo (CA); On-site; USD 240,000 - 290,000; Full time

Benefits offered by this job

Stock options

Comprehensive medical coverage

Daily catered lunch

Flexible PTO

Job summary

Radiant, an El Segundo, CA-based company, seeks a Principal Nuclear Engineer to lead interdisciplinary nuclear engineering for Kaleidos. You will guide neutron transport analyses, Monte Carlo simulations, and core design decisions, directing teams across physics, safety, and regulatory work.

The role emphasizes hands-on ownership from requirements to validation, with frequent collaboration with regulatory and operations teams.

Qualifications

• Bachelor’s degree in nuclear engineering or related field.
• 12+ years of nuclear engineering experience across reactor design, analysis, testing, licensing, or operations.
• Experience leading multidisciplinary technical teams and projects.
• Experience translating analyses into reactor design decisions and regulatory documentation.
• Familiarity with neutronics, Monte Carlo methods, and radiation transport.

Responsibilities

• Lead interdisciplinary team across reactor physics, core performance, shielding, dose, and I&C.
• Establish technical priorities, plans, and ownership across nuclear engineering.
• Serve as technical authority for neutron transport and Monte Carlo methods.
• Own projects from requirements through design, analysis, and documentation.
• Translate analytical results into actionable design decisions and regulatory plans.
• Mentor engineers and promote rigorous verification and validation practices.
• Collaborate with safety, regulatory, and operations teams to resolve challenges.

Skills

Leadership

Strong communication

Nuclear engineering concepts

Education

Bachelor’s degree in nuclear engineering

Master’s degree or Ph.D. in nuclear engineering

Tools

MCNP/OpenMC

SCALE/Serpent/Shift/Griffin

MOOSE-based tools

Python

Job description

Radiant, an El Segundo, CA-based company, seeks a Principal Nuclear Engineer to lead interdisciplinary nuclear engineering for Kaleidos. You will guide neutron transport analyses, Monte Carlo simulations, and core design decisions, directing teams across physics, safety, and regulatory work.

The role emphasizes hands-on ownership from requirements to validation, with frequent collaboration with regulatory and operations teams.