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As of Aug 20, 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.

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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?

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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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Infographic showing various Relap5 job openings in the United States as of August 2026, with employment types broken down into 79% Full Time, and 21% Contract. Highlights an 90% Physical, and 10% Remote job distribution, with an average salary of $104,344 per year, or $50.2 per hour.

System Transients Analysis Engineer

System One Holdings, LLC

Bellevue, WA • On-site

$67 - $110/hr

Full-time

Re-posted 3 days ago

Job description

Job Title: System Transients Analysis Engineer
Location: Bellevue, WA
Job Type: Contract
Work Model: Hybrid/Onsite Preferred
Overview
System One is seeking a highly capable and motivated System Transients Analysis Engineer to support an advanced sodium-cooled reactor program. This role will focus on thermal hydraulic and transient analysis activities supporting advanced reactor system design, plant operations analysis, and control system integration.
The ideal candidate will have strong experience with system analysis codes such as RELAP5 or TRACE, along with a strong foundation in thermal hydraulics, heat transfer, fluid dynamics, and nuclear plant transient analysis.
Responsibilities
  • Develop RELAP5-3D models for steady-state and transient one-dimensional hydraulic network analyses
  • Perform reactor and plant transient analyses for normal operations, upset conditions, emergency events, and faulted scenarios
  • Develop plant-level control strategies and component-level controllers
  • Perform calculations using first principles of heat transfer, thermodynamics, and fluid dynamics to validate analytical results
  • Support evaluation of plant-wide transients, operational narratives, and design solutions
  • Perform multiscale and multidisciplinary thermal hydraulic analyses involving sodium, molten salt, and non-condensable fluids
  • Collaborate closely with safety, I&C, design engineering, and testing teams
  • Support development of new analytical methods and advanced modeling techniques
  • Prepare technical reports, calculations, and engineering documentation

Required Qualifications
  • Bachelor's degree or higher in Nuclear Engineering, Mechanical Engineering, Electrical Engineering, or related discipline
  • Strong experience with thermal hydraulic system codes such as RELAP5 and/or TRACE
  • Strong analytical background in:
    • Thermal hydraulics
    • Fluid dynamics
    • Heat transfer
    • Transient analysis
    • One-dimensional hydraulic network modeling
  • Strong technical writing and communication skills
  • Ability to work effectively in a collaborative, fast-paced engineering environment
  • High level of professionalism, integrity, and teamwork

Preferred Qualifications
  • Experience with ASME component design and analysis
  • Experience modeling control systems and Instrumentation & Controls (I&C)
  • Experience supporting nuclear power plant design or operations
  • Experience developing new analytical methods
  • Advanced reactor or sodium-cooled reactor experience

Physical & Work Environment Requirements
  • Ability to sit and/or stand for extended periods
  • Minimal lifting requirements up to 25 pounds
  • Prolonged computer and keyboard work
  • Standard office or engineering work environment
  • Occasional travel up to 5%

Additional Information
This position may require compliance with U.S. export control regulations. Applicants may be asked to provide information regarding citizenship or work authorization status as part of the hiring process.
Ref: #161-Managed Staffing Charlotte
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About System One

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System One helps employers get work done more efficiently and economically without compromising quality. Over our 35+ year history, we've helped connect thousands of talented people with innovative companies. The excitement of a perfect fit motivates us every single day.

Industry

Business consulting services and recruiting and staffing services

Company size

5,001 - 10,000 Employees

Headquarters location

Pittsburgh, PA, US

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