Summer 2026 Internship - Nuclear Engineer at Radiant

El Segundo, California, United States

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Not SpecifiedCompensation

InternshipExperience Level

InternshipJob Type

UnknownVisa

Nuclear EnergyIndustries

Requirements

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)
This internship is based 100% onsite at Radiant’s HQ in El Segundo, CA
Extended hours or occasional weekend work may be required to support project milestones

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

Skills

neutronics

thermal-hydraulics

shielding

fuel analysis

nuclear design

thermal calculations

technical reports

uncertainty propagation

Radiant

Develops compact nuclear microreactors for energy

About Radiant

Radiant Nuclear develops compact nuclear microreactors aimed at providing reliable and sustainable energy solutions, especially for remote locations and military applications. Their main product, the Kaleidos microreactor, utilizes a CO2 cycle for energy production, allowing for a smaller and more portable reactor that can be deployed in challenging environments. Radiant differentiates itself from competitors by leveraging expertise from veterans of SpaceX and other high-tech industries, focusing on advanced technology in the nuclear energy market. The company's goal is to transform the nuclear energy sector by commercializing its microreactor technology and securing government contracts, such as those with the Department of Defense, while also seeking partnerships with private sector companies to enhance growth.

El Segundo, CaliforniaHeadquarters

2019Year Founded

$151.5MTotal Funding

SERIES_CCompany Stage

Government & Public Sector, EnergyIndustries

51-200Employees

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Stock Options

Unlimited Paid Time Off

One Medical

Risks

Public opposition to nuclear energy may hinder Radiant's market acceptance.

Regulatory delays from the Nuclear Regulatory Commission could impact Radiant's timelines.

Competition from cheaper solar and wind technologies may affect Radiant's market share.

Differentiation

Radiant's Kaleidos microreactor offers zero-emissions power for remote and critical applications.

The company leverages expertise from SpaceX veterans for advanced nuclear technology development.

Radiant's CO2 cycle technology enables compact, efficient, and portable nuclear power solutions.

Upsides

Radiant raised $100M in Series C funding to develop commercial microreactors.

The U.S. Department of Defense awarded Radiant $3.8M for turbomachinery development.

Growing demand for sustainable energy in data centers boosts Radiant's market potential.

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