Summer Internship - Nuclear Engineer

Nuclear Engineering Intern Radiant is seeking a highly motivated Nuclear Engineering Intern to support the design and analysis of nuclear systems for a 1MW HTGR nuclear microreactor.

As part of the engineering team, you will work alongside experienced nuclear engineers and gain hands-on experience in areas such as neutronics, thermal-hydraulics, shielding, and fuel analysis.

This internship offers direct mentorship in a fast-paced startup environment, providing you with a unique opportunity to contribute to the development of the first new fueled reactor design in over 50 years.

Responsibilities & Duties * 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 Required Qualifications & Skills * 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). Desired Qualifications & Skills * 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.

Additional Requirements * 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.