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. 

Benefits and Relocation

• Paid holiday time off  
• Travel reimbursement may be available for eligible interns

At this time, BEA will not sponsor any H1-B visas obtained outside of the United States of America (U.S.A.), including consular visas.

INL is a science-based, applied engineering national laboratory dedicated to supporting the U.S. Department of Energy's mission in nuclear energy research, science, and national defense. With more than 6,300 scientists, researchers, and support staff, the laboratory works with national and international governments, universities and industry partners to change the world's energy future and secure our nation's critical infrastructure.

INL Mission:

Our mission is to discover, demonstrate and secure innovative nuclear energy solutions, other clean energy options and critical infrastructure.

INL Vision:

Our vision is to change the world's energy future and secure our nation's critical infrastructure.

Selective Service Requirements:

To be eligible for employment at INL males born after December 31, 1959 must have registered with the Selective Service System (SSS). For more information see www.sss.gov.

Equal Employment Opportunity:

Idaho National Laboratory (INL) is an Equal Employment Opportunity (EEO) employer. It is the policy of INL to provide equal employment opportunities to all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, protected veteran or disabled status, or genetic information.

Reasonable Accommodation:

We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation.

Other Information:

When applying to positions please provide a resume and answer all questions on the following screens. Applicants, who fail to provide a resume or answer the questions, may be deemed ineligible for consideration.