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Relap5 Jobs (NOW HIRING)

Protingent

Senior Safety V&V Engineer

Bellevue, WA · On-site

$56 - $95/hr

Significant experience with safety analysis software such as RELAP5-3D, TRACE, MELCOR, SAS4A/SASSYS-1, SAM or other nuclear system analysis software. * Familiarity with nuclear design, regulatory ...

Protingent

Senior Safety Methods Engineer

Bellevue, WA · On-site

$37 - $74/hr

Experience performing system-level thermal hydraulic analyses using tools such as RELAP5 3D, GOTHIC, SAS, or equivalent, with the ability to extend or tailor modeling approaches within these ...

System One

Senior Safety Methods Engineer

Bellevue, WA · Remote

$37 - $74/hr

Experience with thermal hydraulic analysis tools such as RELAP5 3D, GOTHIC, SAS, or equivalent. * Proven experience in developing or improving analysis methods, including numerical schemes and ...

System One

Senior Safety Methods Engineer

Bellevue, WA · Remote

$37 - $74/hr

Experience with thermal hydraulic analysis tools such as RELAP5 3D, GOTHIC, SAS, or equivalent. * Proven experience in developing or improving analysis methods, including numerical schemes and ...

System One

Senior Safety Methods Engineer

Bellevue, WA · Remote

$37 - $74/hr

Experience with thermal hydraulic analysis tools such as RELAP5 3D, GOTHIC, SAS, or equivalent. * Proven experience in developing or improving analysis methods, including numerical schemes and ...

System One

Senior Safety Methods Engineer

Bellevue, WA · Remote

$37 - $74/hr

Experience with thermal hydraulic analysis tools such as RELAP5 3D, GOTHIC, SAS, or equivalent. * Proven experience in developing or improving analysis methods, including numerical schemes and ...

Protingent

Senior Safety Analysis Engineer

Bellevue, WA · On-site

$69 - $115/hr

Significant experience with safety analysis software such as RELAP5, TRACE, TRAC, SAS4A/SASSYS-1, or other nuclear system analysis software. * Experience in transient and accident analysis for ...

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How much do relap5 jobs pay per hour?

As of Jul 9, 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 is RELAP5?

RELAP5 is a computer code used for thermal-hydraulic safety analysis of nuclear reactors. It simulates reactor system behavior during normal operation and accident scenarios, requiring knowledge of reactor physics and programming skills. Professionals working with RELAP5 often have backgrounds in nuclear engineering or related fields.

What are the uses of relap?

Relap5 is a thermal-hydraulic simulation software used by engineers to analyze nuclear reactor safety, coolant behavior, and system transients. Professionals in this field utilize Relap5 to perform safety assessments, validate reactor designs, and support research in nuclear engineering. Proficiency in programming and understanding of nuclear systems are often required for effective use.

What are the key skills and qualifications needed to thrive as a RELAP5 Nuclear Safety Analyst, and why are they important?

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.

Is it hard to find a job as a nuclear engineer?

Finding a job as a nuclear engineer can be competitive, but opportunities are available in power plants, research facilities, and government agencies. Strong technical skills, relevant certifications, and a bachelor's or master's degree in nuclear engineering or related fields improve employment prospects.

What is the highest paying nuclear job?

In the nuclear industry, senior reactor operators, nuclear engineers, and health physics managers tend to have the highest salaries. These roles often require advanced certifications, extensive experience, and specialized knowledge of nuclear systems and safety protocols. Salaries can vary based on location, employer, and level of responsibility but generally exceed $100,000 annually for top positions.
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Simulator Design Engineer III

Simulator Design Engineer III

Holtec International

Camden, NJ • On-site

$145K - $165K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 25 days ago

Holtec International rating

8.0

Company rating: 8.0 out of 10

Based on 16 frontline employees who took The Breakroom Quiz

148th of 427 rated machine equipment manufacturers

Job description

Holtec International and its subsidiary companies are developing the SMR-300, a small modular reactor designed to provide an unfailingly safe and secure source of clean energy through nuclear fission. This position is offered by SMR LLC, a member of the Holtec International family-a global turnkey supplier of equipment and systems serving the nuclear, solar, geothermal, and fossil power generation sectors.
Join a growing, multidisciplinary team of designers and engineers working on the next-generation nuclear power plant. Holtec International is seeking applicants for the role of Simulator Design Engineer III. This position is responsible for the development and maintenance of software used in the SMR-300 simulator.
The Simulator Design Engineer III will apply industry best practices, regulatory guidance, codes and standards, and engineering expertise to support control strategy development and simulator-assisted design activities. The engineer will be part of a dynamic team executing a U.S. Government cost-shared development program, requiring efficient completion of engineering assignments. The Simulator Engineer III will support the development, maintenance, and enhancement of nuclear power plant simulators. The ideal candidate will have experience in real-time simulation, thermo-hydraulic modeling, and control system integration. This role involves working with advanced simulation tools, integrating system models, and ensuring simulator fidelity for operator training and engineering applications.
Location(s): Camden, NJ, Covert, MI, or North Pittsburgh, PA
Primary responsibilities:
  • Simulator Development & Maintenance:
    • Design, develop, and maintain high-fidelity nuclear plant simulators, ensuring compliance with industry standards.
    • Implement control logic, thermal-hydraulic models, and system responses for real-time simulation.
    • Integrate RELAP5, S3R, and 3KeyMaster into simulation environments.
    • Ensure simulator configuration control and model validation.
  • System Modeling & Integration:
    • Develop and update thermo-hydraulic, electrical, and mechanical system models to improve simulator accuracy.
    • Interface simulators with digital control platforms and plant control systems.
    • Support the integration of I/O systems for seamless data communication.
  • Testing, Validation & Troubleshooting:
    • Conduct verification and validation (V&V) testing to ensure simulation accuracy and compliance.
    • Diagnose and resolve software, model, and control logic discrepancies.
    • Perform regression testing to verify simulator performance after updates.
  • Collaboration & Technical Support:
    • Work with cross-functional teams, including engineers, and training personnel.
    • Support operator training programs by ensuring simulator responsiveness and reliability.

Requirements:
  • Bachelor's degree in Mechanical, Electrical, or Nuclear Engineering, or a related field.
  • Experience with nuclear power plant systems and process modeling.
  • Strong proficiency in simulator tools, such as 3KeyMaster, RELAP5, MELCOR, or equivalent.
  • Understanding of plant control logic, I&C systems, and human-system interface (HSI) concepts.
  • Eligible to work in accord with Department of Energy 10 CFR Part 810.

Preferred Qualifications:
  • Experience with nuclear power plant systems and process modeling.
  • Experience in CFD modeling and multi-physics simulation.
  • Ability to analyze plant operation data and translate it into simulation models.
  • Knowledge of digital twin technology and real-time data integration.
  • Familiarity with NRC regulations and ANS-3.5 standards for simulator certification.
  • Strong problem-solving, troubleshooting, and analytical skills.

A Generation Ahead by Design™
Investing in people who power the future.
We believe great work deserves great rewards. Our benefits go beyond the basics, reflecting our commitment to supporting your whole self...your health, your future, and your career growth. This includes:
Compensation:
  • Annual compensation based on skills and experience ranging from $145,000.00-$165,000.00
  • Additional compensation earned through incentive structure

Benefits:
  • Medical, dental, and vision insurance
  • 401(k) retirement plan with company match
  • Paid time off and 11 Paid Holidays
  • Company-paid life and AD&D insurance
  • Employee Assistance Program
  • Wellness resources and voluntary benefits
  • Training and educational assistance

If you're driven to solve meaningful challenges and make a lasting impact, we invite you to build your career at Holtec-a generation ahead by design™.

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