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Thermal Hydraulics Analyst

Idaho Falls, ID · On-site

$95K - $195K/yr

Develop and maintain RELAP5-3D system models representing reactor systems, experimental facilities, and thermal-hydraulic test configurations. * Perform steady-state and transient analyses to ...

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How much do relap5 jobs pay per hour?

As of Sep 10, 2026, the average hourly pay for relap5 in the United States is $50.17, according to ZipRecruiter salary data. Most workers in this role earn between $39.42 and $60.82 per hour, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a RELAP5 nuclear safety analyst?

To thrive as a RELAP5 Nuclear Safety Analyst, you need a solid background in nuclear engineering, thermohydraulics, and reactor safety analysis, usually supported by an engineering degree. Proficiency in using the RELAP5 simulation software, understanding of nuclear regulatory codes, and familiarity with data analysis tools are essential technical requirements. Strong analytical thinking, attention to detail, and effective communication skills help you interpret complex data and collaborate with multidisciplinary teams. These capabilities are vital to ensure accurate safety assessments and compliance with regulatory standards in nuclear power plant operations.

What is the difference between Relap5 vs Relap5?

AspectRelap5Relap5

Since the comparison is between the same job title, there is no difference in skills, credentials, or work environment. Both roles involve using Relap5 software for thermal-hydraulic safety analysis in nuclear engineering, requiring similar certifications and industry experience. Typically, professionals in this role work in nuclear power plants, research facilities, or engineering firms focused on nuclear safety. The primary distinction may lie in specific project focus or experience level, but overall, the roles are equivalent.

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Relap5 jobs near you
Infographic showing various Relap5 job openings in the United States as of September 2026, with employment types broken down into 71% Full Time, and 29% Contract. Highlights an 82% Physical, and 18% Remote job distribution, with an average salary of $104,344 per year, or $50.2 per hour.

RELAP5-3D Code Developer

Idaho Falls, ID • On-site

Search Jobs - INL Professional Careers
See more jobs at Search Jobs - INL Professional Careersexternal

$95K - $195K/yr

Other

Posted 4 days ago

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.
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