RELAP5-3D Code Developer

Search Jobs - INL Professional Careers; Idaho Falls (ID); On-site; USD 79,000 - 195,000; Full time

Benefits offered by this job

9x80 Schedule

Every Other Friday Off

Job summary

Idaho National Laboratory is seeking a Modeling & Simulation Professional to join the Reactor Systems and Heat Transport team. The role focuses on modernizing RELAP5-3D capabilities, improving code quality, and integrating new features across a nuclear safety software platform.

The ideal candidate will perform thermal hydraulic analysis and contribute to strategic planning, with a 9x80 schedule at the REC facility and every other Friday off.

Qualifications

• BS in Mathematics, Engineering, Computer Science or related discipline.
• Advanced degree preferred for higher level postings.
• Strong communication skills (verbal and written).
• Export control status restricts eligibility (US Citizen or Green Card).

Responsibilities

• Update legacy Fortran code to modern standards and structure.
• Refactor complex routines; improve inline documentation.
• Develop new features in Fortran; write Python scripts.
• Apply automated documentation systems for updates.
• Submit code via pull requests to repository.
• Participate in IRUG meetings and collaborate with partners.
• Perform thermal hydraulic analysis using RELAP5-3D or other tools.
• Support strategic planning and performance reviews for long-term goals.

Education

Bachelor of Science in Mathematics, Engineering or Computer Science

Advanced degree in Mathematics, Engineering, Computer Science

Tools

RELAP5-3D

Fortran

Python

Job description

INL is seeking a skilled and forward-thinking Developer to join the Reactor Systems and Heat Transport Department as part of the RELAP5-3D team in modernizing and expanding the capabilities of this critical nuclear safety analysis tool. This role involves improving code structure, readability, and maintainability, while also supporting the integration of new features and tools. The ideal candidate will be passionate about clean code practices and eager to contribute to a high-impact nuclear safety software platform. Additionally the developer will have the ability to perform thermal hydraulic analysis using RELAP5-3D to determine areas of improvement.

Essential Job Functions and Responsibilities:

• Update legacy Fortran code to modern standards, including restructuring.
• Break down complex routines into manageable components through refactoring and enhancing inline documentation.
• Program new code features, capabilities, and algorithms in Fortran as assigned and use existing and new write Python scripts.
• Apply the automated documentation systems to streamline manual creation and updates.
• Submit code updates as pull requests to the repository.
• Participate in the International RELAP5 User Group (IRUG) Meetings.
• Collaborate with analysts, stakeholders, and external partners to support ongoing development and integration efforts.
• Perform thermal hydraulic design/safety analysis using RELAP5-3D or other thermal hydraulic tools.
• Participate in strategic planning and performance reviews to align development with long-term goals.

Required:

• Level 2: Bachelor of Science in Mathematics, Engineering, Computer Science, or related discipline from an accredited institution and 2 years of relevant experience; or an Advanced degree in Mathematics, Engineering, Computer Science, or related discipline from an accredited institution.
• Level 3: Bachelor of Science in Mathematics, Engineering, Computer Science, or related discipline from an accredited institution and 5 years of relevant experience; or an Advanced degree in Mathematics, Engineering, Computer Science, or related discipline from an accredited institution and 2 years of relevant experience.
• Excellent verbal and written communication skills.
• This position is subject to export control restrictions per the Department of Energy. For this reason, you must be either a US Citizen or a US Green Card holder to qualify for the job.

The ideal candidate will possess:

• Advanced degree from an accredited institution.

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, keyboard and type, reach with hands and arms, and operate job-related equipment. The employee must occasionally lift and/or move up to 25 pounds. Sufficient visual acuity and hearing capacity to perform the essential functions and interact with people is required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Job Information:

Idaho National Laboratory is hiring a Modeling & Simulation Professional to work on our Reactor Systems and Heat Transport team. Our team works a 9x80 schedule located out of our REC facility with every other Friday off.

• The pay range for this position is: Level 2 ($79,344 - $162,732) / Level 3 ($95,256 - $195,288). At Idaho National Laboratory compensation decisions are determined using factors such as education, relevant experience, and other credentials.
• Multi-Level: This is a multi-level posting and you will be placed at the appropriate level dependent on depth and breadth of proven experience and skills.