Nuclear Engineer Intern

Job Description: We are looking for a nuclear engineer intern to support nuclear reactor engineering. The internship takes place in Summer 2027. Position 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 Qualifications: Pursuing BS or MS in Mechanical Engineering, 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 the company’s HQ in El Segundo, CA. Preferred Qualifications: 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 the company’s mission to rapidly deploy nuclear microreactors to provide clean energy in remote locations. Compensation: The compensation for this role is $34–40 per hour. Important: The successful application submission for the above role(s) will be conditional to your profile evaluation by our Recruitment Specialists using the AI system. We can let you know better once you submit your resume.