RELAP5-3D Development Intern - Summer 2027

Idaho National Laboratory is seeking an intern to join our Reactor Systems and Heat Transport team. Fusion energy systems frequently involve the transport of tritium within complex thermal‑hydraulic environments. In this role, you will contribute to the development and implementation of advanced computational methods to model tritium transport using the RELAP5‑3D code.

As part of the project, you will engage in both prototype development in Python and production‑level coding in Fortran, while also supporting theoretical research that underpins these modeling approaches. This internship offers a unique opportunity to gain hands‑on experience at the intersection of nuclear engineering, computational methods, and fusion technology.

This team works a 9x80 schedule onsite at our Idaho Falls campus. Start date and duration of internship vary based on project and student availability. You may be eligible for course credit for this internship.

Minimum Qualifications:

• Enrolled full time in an Undergraduate Degree Program majoring in nuclear engineering, mechanical engineering, chemical engineering, or Physics 
• A minimum overall 3.0 GPA
• Authorization to work in the U.S. (including CPT and OPT)
• Current Resume or CV
• Unofficial Transcripts (include current and completed degree programs)
• Current class schedule and number of credits

Preferred Qualifications:

• Experience with RELAP5-3D analysis and code development. Fortran programming, Python programming

Compensation:

• Undergraduate Internships ($26.94/hour - $32.41/hour)

Physical Requirements:

While performing the duties of this classification, the employee is frequently required to stand, walk, sit, stoop, kneel, bend, use hands to handle materials, manipulate tools, type on a keyboard, reach with hands and arms, and operate job-related equipment. The employee must occasionally lift and/or move up to 35 pounds without assistance. Sufficient visual acuity and hearing capacity to perform the essential functions and interact with people is required. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.