2027 New Graduate - Nuclear Engineer
About The Position
Radiant is a startup based in El Segundo, CA, focused on developing the world's first mass-produced, portable nuclear microreactors. Their initial reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for transportability and long-term operation without refueling. This portable nuclear power solution aims to serve as a replacement for diesel generators, providing essential power for critical facilities like hospitals, data centers, remote locations, and military bases. Radiant utilizes modern software engineering practices to accelerate the development of safe, factory-built microreactors using established materials. Founded in 2020, the company is preparing to test its first reactor at the Idaho National Laboratory and plans to commence customer deliveries in 2028. Radiant is looking for a motivated Nuclear Engineer to join their team.
Requirements
- BS or MS in Mechanical Engineering, Nuclear Engineering, or a related discipline.
- Graduating in December 2026 or Spring 2027.
- 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).
Nice To Haves
- 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.
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.
Benefits
- Substantial incentive stock plan for all full-time employees.
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
- One Medical: Sponsored memberships for employees and their dependents.
- Vision: 100% top tier plan coverage + 50% for dependents.
- Dental: 100% top tier plan coverage, orthodontia extra, 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.
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What This Job Offers
Job Type
Full-time
Career Level
Entry Level
