Radiant · 2 weeks ago
Summer 2026 Internship - Nuclear Engineer
El Segundo, CA
Internship
Onsite
Intern
Start in 2026 SummerRadiant is a startup based in El Segundo, CA, focused on developing portable nuclear microreactors. The Nuclear Engineering Intern will support the design and analysis of nuclear systems, gaining hands-on experience in areas such as neutronics and thermal-hydraulics while working alongside experienced engineers.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
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 the development of lower order shielding analysis models to develop rapid shielding design solutions
Support the development of uncertainty propagation methodology and its execution on the Kaleidos Demonstration Unit
Perform criticality safety analysis for the Production Plant of Kaleidos reactors
Present a final project review at the end of internship to engineers and leadership
Qualification
Required
Currently pursuing a bachelor's or master's degree in nuclear engineering or a related discipline
Strong academic foundation in nuclear engineering principles (e.g., reactor physics, thermal-hydraulics, radiation shielding)
Proficiency in at least one programming language (Python, C++, C#, or similar)
Preferred
Hands-on experience through coursework, research, projects, or labs in nuclear system design or analysis
Familiarity with nuclear simulation codes (e.g., OpenMC, Serpent, MCNP, MOOSE, BISON, RELAP, CFD, Pronghorn, GRIFFIN)
Prior software development experience or exposure to version control, testing, or documentation practices
Strong communication skills and ability to work in a collaborative team environment
Enthusiasm for Radiant's mission to rapidly deploy nuclear microreactors to provide clean energy in remote locations
Benefits
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch. Free snacks and drinks.
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.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
Founded in 2019
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Andreessen HorowitzUnion Square Ventures
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
2026-01-07
The Motley Fool
2026-01-04
Globe and Mail
2026-01-03
Company data provided by crunchbase