RELAP5-3D Code Developer

Idaho National Laboratory • Idaho Falls, ID

2d • Onsite

About The Position

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.

Requirements

• 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.
• Must be either a US Citizen or a US Green Card holder.

Nice To Haves

• Advanced degree from an accredited institution.

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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level