Senior Safety Analysis Engineer, Nuclear

System One, Inc.; Bellevue (WA); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Spending accounts

Life insurance

Voluntary plans

401(k) plan

Job summary

System One is seeking a contract Safety Analysis Engineer to perform deterministic nuclear safety analysis and transient/accident modeling (RELAP5-3D or similar) to support NRC licensing submittals for the Natrium reactor. This remote role supports US-based work.

You will develop and document system models, analyze DBAs/LBEs, prepare FSAR-style reports, and collaborate across engineering teams on methods development, V&V, benchmarking, and uncertainty studies.

Qualifications

• Extensive experience in nuclear safety analysis and reactor system modeling.
• Proficiency with safety analysis software such as RELAP5-3D, TRACE, TRAC, SAS4A/SASSYS-1.
• Experience in transient and accident analysis for NRC submittals (e.g., Chapter 15 FSAR).
• Strong knowledge of nuclear systems thermal-hydraulics, reactor physics, and transient phenomena.
• Familiarity with nuclear reactor instrumentation, control systems, and safety regulation compliance.
• Degree: B.S. in nuclear engineering with 10+ years or MS/Ph.D. with 5-7+ years of nuclear engineering or relevant field.
• Demonstrated analytical, modeling, and reporting skills.
• Experience working in multidisciplinary teams and under quality assurance programs (NQA-1).
• Strong software engineering skills in Python, Fortran, C++, or similar are a plus.

Responsibilities

• Perform deterministic safety analysis using RELAP5-3D code for the Natrium sodium fast reactor.
• Analyze design basis accidents (DBAs) and licensing basis events (LBEs) to support reactor licensing with US NRC.
• Model and integrate various plant systems within safety analysis computer codes.
• Develop safety analysis reports, including the Final Safety Analysis Report (FSAR).
• Collaborate with cross-functional teams on core and reactor SSC requirements and licensing documentation.
• Contribute to safety method development, code assessment, scaling analysis, and validation activities.
• Maintain documentation of models and analysis results.
• Conduct engineering reviews of analysis and design deliverables.
• Assess plant transient benchmark tests and perform relevant benchmark calculations.
• Support implementation of software capabilities for transient and accident analysis.

Skills

Nuclear safety analysis

Reactor system modeling

Python

Fortran

C++

NQA-1

Education

Bachelor's degree in Nuclear Engineering

Master's or PhD in Nuclear Engineering or related field

Tools

RELAP5-3D

TRACE

TRAC

SAS4A/SASSYS-1

Job description

Job Title: Safety Analysis Engineer, Nuclear
Location: Bellevue, WA
Type: Contract, 12 months
Contractor Work Model: Remote

Overview

This contract Safety Analysis Engineer role performs deterministic nuclear safety analysis and transient/accident modeling (RELAP5-3D or similar) to support U.S. NRC licensing submittals. The engineer develops and documents system models, analyzes AOOs/DBEs/DBAs and licensing-basis events, supports FSAR-style reporting, and collaborates across engineering teams on methods development, V&V/benchmarking, and uncertainty/sensitivity studies.

Responsibilities

• Perform deterministic safety analysis using RELAP5-3D code for the Natrium sodium fast reactor
• Analyze design basis accidents (DBAs) and licensing basis events (LBEs) to support reactor licensing with US NRC
• Model and integrate various plant systems within safety analysis computer codes
• Develop safety analysis reports, including the Final Safety Analysis Report (FSAR)
• Collaborate with cross-functional teams on core and reactor SSC requirements and licensing documentation
• Contribute to safety method development, code assessment, scaling analysis, and validation activities
• Maintain documentation of models and analysis results
• Conduct engineering reviews of analysis and design deliverables
• Assess plant transient benchmark tests and perform relevant benchmark calculations
• Support implementation of software capabilities for transient and accident analysis

Requirements

• Extensive experience in nuclear safety analysis and reactor system modeling
• Proficiency with safety analysis software such as RELAP5, TRACE, TRAC, SAS4A/SASSYS-1, or similar
• Experience in transient and accident analysis for NRC submittals (e.g., Chapter 15 FSAR)
• Strong knowledge of nuclear systems thermal-hydraulics, reactor physics, and transient phenomena
• Familiarity with nuclear reactor instrumentation, control systems, and safety regulation compliance
• Degree: B.S. with 10+ years or M.S./Ph.D. with 5-7+ years of nuclear engineering or relevant field
• Demonstrated analytical, modeling, and reporting skills
• Experience working in multidisciplinary teams and under quality assurance programs (NQA-1)
• Strong software engineering skills in Python, Fortran, C++, or similar are a plus

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including:

• medical
• dental
• vision
• spending accounts
• life insurance
• voluntary plans
• participation in a 401(k) plan

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.