Nuclear Engineer — Portable Microreactor Systems (Remote)

Socket.dev; El Segundo (CA); On-site; USD 28,000 - 41,000; Full time

Benefits offered by this job

Lunch provided

Flexible PTO

Headquarters near ocean

Job summary

Radiant, an El Segundo, CA‑based startup, seeks a Nuclear Engineer intern to assist with design, analysis, and documentation of shielding, neutronics, and thermal studies. You will work with cross‑functional teams to refine performance models and develop rapid design tools for Kaleidos reactors.

The role focuses on building a strong foundation in reactor physics, thermal-hydraulics, and code-based analysis, while contributing to real projects and presenting findings to leadership.

Qualifications

• BS or MS in Mechanical Engineering, Nuclear Engineering, or related.
• Graduating December 2026 or Spring 2027.
• Strong foundation in reactor physics, thermal-hydraulics, radiation shielding.
• Proficiency in Python, C++, C#, or similar.

Responsibilities

• Assist with nuclear design and analysis tasks, including shielding, neutronics, thermal, and fuel-related studies.
• Support coupled neutronics and thermal calculations to refine system performance models.
• Document methods, results, and findings in clear technical reports and presentations.
• Collaborate with cross-functional teams and provide technical input as projects evolve.
• Support development of lower order shielding analysis models for rapid shielding design solutions.
• Support uncertainty propagation methodology and its execution on the Kaleidos Demonstration Unit.
• Perform criticality safety analysis for the Production Plant of Kaleidos reactors.
• Present final project reviews to engineers and leadership.

Skills

Programming proficiency

Team collaboration

Strong communication

Education

BS/MS in Mechanical or Nuclear Eng

Tools

OpenMC

Serpent

MCNP

MOOSE

BISON

RELAP

CFD

Pronghorn

GRIFFIN

Job description

Radiant, an El Segundo, CA‑based startup, seeks a Nuclear Engineer intern to assist with design, analysis, and documentation of shielding, neutronics, and thermal studies. You will work with cross‑functional teams to refine performance models and develop rapid design tools for Kaleidos reactors.

The role focuses on building a strong foundation in reactor physics, thermal-hydraulics, and code-based analysis, while contributing to real projects and presenting findings to leadership.