Summer 2026 Internship - Nuclear Engineer

Description

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

Requirements

• Familiarity with nuclear simulation codes (e.g., OpenMC, Serpent, MCNP, MOOSE, BISON, RELAP, CFD, Pronghorn, GRIFFIN).
• Enthusiasm for Radiant’s mission to rapidly deploy nuclear microreactors to provide clean energy in remote locations.
• Proficiency in at least one programming language (Python, C++, C#, or similar).
• Hands-on experience through coursework, research, projects, or labs in nuclear system design or analysis.
• Strong academic foundation in nuclear engineering principles (e.g., reactor physics, thermal-hydraulics, radiation shielding).
• Prior software development experience or exposure to version control, testing, or documentation practices.
• Currently pursuing a bachelor’s or master’s degree in nuclear engineering or a related discipline.
• Strong communication skills and ability to work in a collaborative team environment.

Benefits

• Stock: Substantial incentive stock plan for all full-time employees.
• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
• Vision: 100% premium coverage for top tier plan + 50% for dependents.
• One Medical: Sponsored memberships for eligible employees and their dependents.
• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
• Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
• Dental: 100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.
• Flexible PTO policy. Remote workday allocation.
• Company and team-bonding events, happy hours and in-person camaraderie.
• Beautiful El Segundo headquarters close to the Pacific Ocean.
• This internship is based 100% onsite at Radiant’s HQ in El Segundo, CA.
• Daily catered lunch. Free snacks and drinks.

Training + Development

Interview process

Visa Sponsorship

Security clearance