Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.
Internship - Nuclear Engineer – Radiation Transport and Shielding
Radiant is seeking a highly motivated Nuclear Engineer Intern for Summer 2025. Under the Kaleidos Demonstration Unit engineering team, you will provide modeling and simulation support to the nuclear analysis toolbox to investigate nuclear-related design parameters and physics-based assumptions. You will develop new reactor shielding and physics models, own your work, and defend your final project to other nuclear engineers and the broader company. You’ll get mentorship and report to the Lead Nuclear Engineer, learn from cross-functional teammates, and have a tangible impact on improving Kaleidos’ fuel performance assessments that will enable Kaleidos’ successful entrance into the market.
Responsibilities and Duties:
- Assess the validity and appropriateness of shielding analysis models, benchmarking critical figures of merit against other internal tooling.
- 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.
- Assess open items and uncertainties upon completion of your task(s).
- Present a final project review at the end of internship to engineers and leadership.
Required Skills and Qualifications:
- Currently pursuing BS in nuclear engineering, physics, or related discipline.
- At least 1 year of experience with nuclear engineering tools, such as radiation transport (e.g., MCNP, OpenMC, Serpent), thermal fluids (e.g., AGREE, PRONGHORN, CFD), or fuel performance (e.g., BISON, MELCOR).
- Ability to seek out resources and proactively ask questions to finish projects through completion effectively, accurately, and timely.
- Genuinely excited for our mission to rapidly deploy nuclear microreactors to remote locations requiring abundant, clean energy.
Desired Skills and Qualifications:
- Currently pursuing a M.S./Ph.D. in nuclear engineering, physics, or related discipline.
- A high level of independence in solving challenging engineering tasks is preferred.
- Hands on project examples outside of the classroom such as extracurricular projects, clubs, research, lab work or personal projects.
- Prior internship experience helpful but not required.
- Ability to work in a fast-paced startup environment with a proactive and collaborative attitude.
Additional Requirements:
- Must be able to commit to 10-12 consecutive weeks in Summer 2025.
- Must be willing to work extended hours and weekends as necessary to accomplish our mission.
- Must work 100% onsite at El Segundo HQ.
Employee Benefits for Eligible Employees:
- Stock: Substantial incentive stock plan for all full time, salaried 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 are offered as employee contributed benefits.
- Free snacks and drinks onsite.
- Flexible PTO policy.
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.
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What We Do
Radiant is a clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.
Why Work With Us
Our world-class team has prior experience in complex hardware development from SpaceX, McMaster, The Boring Company, and renowned national laboratories that define our mentality to radically improve our microreactors. We care deeply about our mission to reduce carbon emissions, and have fun while doing so from trivia nights to ski retreats.
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