Senior Safety Methods Engineer
Bellevue, WA
Experience: 0
Category: Energy
Contractor Work Model: Undecided
Brand: System One
Compensation Range: 37.00 - 74.00 Per Hour
Job ID: 351288
Date Posted: 08/03/2026
Shortcut: http://jobs.systemone.com/JsIX2V
Job Title: Senior Safety Methods Engineer
Location: Bellevue, WA
Type: Contract, 12 months
Compensation: $37.00 - $74.00
Contractor Work Model: Onsite, remote available for exceptional non-local candidates.
Overview:
This role develops and qualifies system-level thermal-hydraulic analysis methods to support reactor safety and licensing work. Responsibilities include running steady-state and transient analyses to assess model performance and fidelity needs, integrating closure models and empirical correlations into existing frameworks, and identifying gaps through sensitivity studies to drive method improvements. The engineer also builds automated, repeatable workflows, documents methodologies and assumptions, collaborates across disciplines to align methods with design and safety analysis, and follows SQA/NQA-1 practices to ensure traceability, configuration control, and reproducibility.
Responsibilities:
- Support the design and licensing of the reactor by developing methods for Licensing Basis Events (LBE) analyses.
- Contribute subject matter expertise to the Sodium Fast Reactor (SFR) Program and other related projects.
- Develop system-level thermal hydraulic analysis methods, including modeling strategies, numerical approaches, and closure models.
- Perform steady-state and transient system-level analyses to assess models, methods, and their fidelity requirements.
- Support method qualification through numerical verification, applicability assessments, and performance characterization.
- Formulate and integrate closure models and empirical correlations into existing analysis frameworks.
- Identify modeling gaps and support method enhancements via sensitivity studies.
- Develop automated workflows and tools for model setup, execution, post-processing, and reproducible applications.
- Document modeling methodologies, assumptions, and numerical performance for licensing and design support.
- Collaborate across disciplines to ensure thermal hydraulic methods are integrated with plant design and safety analysis workflows.
- Apply and improve SQA and NQA 1 modeling practices, ensuring traceability, configuration control, and reproducibility.
- Degree in Mechanical, Nuclear, Chemical Engineering, or similar fields.
- 3+ years of experience in system-level thermal hydraulic modeling and method development for nuclear or complex energy systems.
- 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 stability/accuracy optimization.
- Strong foundation in thermal fluids and reactor system behavior, especially in advanced reactor designs.
- Experience performing sensitivity analyses and identifying model gaps.
- Familiarity with scientific programming and workflow automation (Python, MATLAB).
- Knowledge of NQA 1 quality assurance standards for modeling workflows, including methodology documentation and configuration control.
- Strong analytical skills, clear technical communication, and ability to manage multiple development efforts.
- High integrity and trustworthiness, with openness in communication and teamwork orientation.
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, as well as 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.
Ref: #161-Managed Staffing Charlotte
-
Senior Engineer, Plant Thermal Hydraulic Methods
Bellevue, WA
Job Title: Senior Engineer, Plant Thermal Hydraulic Methods Location: Bellevue, WA Type: Contract Compensation: From $56.00 to $95.00 per hour Contractor Work Model: Remote – offsite Overview System One is seeking a Senior Engineer, Plant Thermal Hydra...
Date Posted: 07/24/2026 Recommended
-
Senior Engineer, Plant Thermal Hydraulics Validations
Bellevue, WA
Job Title: Senior Engineer, Plant Thermal Hydraulics Validations Location: Bellevue, WA Type: Contract Compensation: $56.00-$95.00 Contractor Work Model: Remote – offsite Overview System One is seeking a Senior Engineer, Plant Thermal Hydraulics Valida...
Date Posted: 07/24/2026 Recommended
-
Safety Analysis Engineer, Nuclear
Bellevue, WA
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 model...
Date Posted: 08/03/2026 Recommended
-
Senior Nuclear Safety Analysis Engineer (Accident/Transient Methods)
Bellevue, WA
Job Title: Senior Safety Methods Engineer (Accident/Transient Methods) Type: Contract (yearlong) Compensation: $69 - $115 hourly Contractor Work Model: Fully Remote Paid holidays and PTO System One is seeking a Senior Safety Methods Engineer to perform...
Date Posted: 08/03/2026 Recommended
-
Senior Safety Verification and Validation Engineer
Bellevue, Washington
Job Title: Senior Safety Verification and Validation Engineer Type: Contract (12-months) Contractor Work Model: Remote About the Role: As a Senior Safety V&V Engineer, you will be instrumental in verifying and validating safety assessment models and so...
Date Posted: 08/03/2026 Recommended
-
System Transients Analysis Engineer
Bellevue, Washington
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...
Date Posted: 07/29/2026 Recommended
-
Nuclear Methods Engineer
Bellevue, WA
Job Title: Nuclear Methods Engineer Location: Bellevue, WA Type: Contract Compensation: $52.00 - $85.00 Work Model: Remote – offsite Hours: 40.0 Overview System One is seeking a highly motivated Nuclear Methods Software Engineer for a yearlong, fully r...
Date Posted: 07/20/2026 Recommended
-
Senior Structural Analyst
Bellevue, Washington
Senior Structural Analyst Location: Remote Company: System One Pay Rate: $56.00–$95.00/hour Position Type: Long-Term Contract Position Overview System One is seeking an experienced Senior Structural Analyst to support the design and development of adva...
Date Posted: 07/27/2026 Recommended
-
Nuclear Engineering Program Developer
Bellevue, WA
Job Title: Nuclear Engineering Program Developer Location: Bellevue, WA Type: Contract Compensation: $56.00 - $95.00 per hour Work Model: Remote – offsite Hours: 40.0 Overview System One is hiring a Nuclear Engineering Program Developer who will be foc...
Date Posted: 07/08/2026 Recommended
-
RAC System Design Engineer (Mechanical)
Bellevue, WA
Job Title: RAC System Design Engineer (Mechanical) $54 - $90 an hour Location: Remote 12 months with possible extension Position Overview System One is seeking a RAC System Design Engineer (Mechanical) to support the design and delivery of an advanced ...
Date Posted: 06/09/2026 Recommended
-
Fuel Handling System Design Engineer
Bellevue, WA
Job Title: Fuel Handling System Design Engineer Location: Bellevue, WA Type: Contract Compensation: $52.00 - $85.00 Onsite work model, remote work model available for exceptionally qualified non-local candidates. Responsibilities: Design of nuclear fue...
Date Posted: 08/03/2026 Recommended
-
CRD System Design Engineer (Mechanical)
Bellevue, WA
Job Title: CRD System Design Engineer (Mechanical) Company: System One Location: Bellevue, WA / Remote Pay Rate: $54.00 - $90.00 per Hour Position Type: Contract Duration: 12 Months with Possible Extension Position Overview System One is seeking a CRD ...
Date Posted: 06/09/2026 Recommended
-
Senior Fuel Handling System Design Engineer
Bellevue, WA
Job Title: Senior Fuel Handling System Design Engineer Location: Bellevue, WA Type: Contract Compensation: $69.00 - $115.00 Work Model: Remote – offsite Hours: 40.0 Responsibilities: Design of nuclear fuel handling systems and fuel handling sub-systems...
Date Posted: 08/03/2026 Recommended
-
Principal Engineer, Plant Design Integration
Bellevue, WA
Job Title: Principal Engineer - Plant Design Integration Location: Bellevue, WA Type: Contract Compensation: $69.00 - $116.00 Work Model: Remote – offsite Overview System One is seeking an experienced Plant Design Integration Engineer to support the de...
Date Posted: 07/29/2026 Recommended
-
Senior Engineer, Fuel Handling and Dry Storage
Bellevue, WA
Senior Engineer, Fuel Handling and Dry Storage Company: System One Location: (Remote/Offsite) Position Type: Long-Term Contract Pay Rate: $52.00 - $85.00/hour Schedule: 40 hours/week Position Overview System One is seeking an experienced Senior Fuel Ha...
Date Posted: 08/03/2026 Recommended
-
Mechanical Designer
Bellevue, WA
Mechanical Designer Location: Bellevue, WA Job Type: Contract Work Model: Hybrid (Onsite & Remote) Schedule: 40 hours/week Pay Rate: $37.00 - $74.00/hour DOE System One is seeking a Mechanical Designer to support the design and development of advanced ...
Date Posted: 06/26/2026 Recommended
-
Principal Engineer, Seismic CSA Integration and Oversight
Bellevue, WA
Job Title: Principal Engineer Seismic/CSA Integration & Oversight Type: Contract, 12 months Compensation: $69.00 - $115.00 per hour Contractor Work Model: Remote Responsibilities Support the development of plant level requirements and strategies relate...
Date Posted: 08/03/2026 Recommended
-
Radiological Engineer
Corvallis, OR
Radiological Engineering Analyst (Contract) Location: Remote (Contiguous U.S.) Duration: Contract Schedule: Full-time, 40 hours/week Position Summary System One is seeking an experienced Radiological Engineering Analyst to support advanced nuclear engi...
Date Posted: 07/06/2026 Recommended
-
Plant Integration Engineer – Steam & Power Systems
Bellevue, Washington
Job Title: Plant Integration Engineer – Steam & Power Systems Location: Bellevue, WA Type: Contract Compensation: $56.00 - $96.00 per hour Work Model: Onsite – onsite Overview Responsibilities Provide technical integration and oversight for Energy Isla...
Date Posted: 07/08/2026 Recommended
-
Senior Mechanical Designer
Bellevue, Washington
Position Overview System One is seeking a highly motivated Senior Mechanical Designer to support the design and development of advanced Generation IV nuclear reactor systems. This role is responsible for creating structural and mechanical design soluti...
Date Posted: 06/26/2026 Recommended
-
Senior Welding Engineer
Bellevue, WA
Job Title: Senior Welding Engineer Location: Bellevue, WA Type: Contract Compensation: $56.00-$95.00 Contractor Work Model: Onsite – onsite (local candidates only) Hours: 40.0 Overview System One is seeking a Senior Welding Engineer for a yearlong cont...
Date Posted: 08/03/2026 Recommended
-
System Design Engineer, EM Pump
Bellevue, WA
Job Title: System Design Engineer, EM Pump Location: Bellevue, WA Type: Contract Compensation: $69.00 - $115.00 Work Model: Remote – offsite Hours: 40.0 Overview: System One is seeking an experienced System Design Engineer to support the design, fabric...
Date Posted: 07/29/2026 Recommended
-
System Design Engineer, Fluids
Bellevue, WA
System One is seeking a System Design Engineer to support advanced nuclear reactor development. This role will support the Sodium Processing Systems team, focusing on system design, vendor coordination, and integration of hardware into overall plant sy...
Date Posted: 07/29/2026 Recommended
-
Plant Radiological Integration Engineer
Bellevue, WA
Job Title: Plant Radiological Integration Engineer Type: Contract Compensation: $69.00 – $115.00 Work Model: Remote – offsite Hours: 40.0 System One is hiring a Plant Radiological Integration Engineer to provide the following services that will focus...
Date Posted: 08/03/2026 Recommended
-
Junior I & C Design Engineer
Bellevue, Washington
I&C Design Engineer Location: Bellevue, WA Job Type: Contract Schedule: 40 hours/week System One is seeking an experienced Instrumentation & Controls (I&C) Design Engineer to support the design and integration of advanced nuclear reactor systems. This ...
Date Posted: 06/30/2026 Recommended
-
Senior Mechanical Design Engineer
Bellevue, Washington
Senior Mechanical Design Engineer (Core Components) Location: Bellevue, WA Job Type: Contract - Remote Schedule: 40 hours/week System One is seeking a highly motivated Senior Mechanical Design Engineer (Core Components) to support the design and develo...
Date Posted: 07/29/2026 Recommended
-
Probabilistic Risk Assessment (PRA) Engineer (Entry Level)
Bellevue, WA
Probabilistic Risk Assessment (PRA) Engineer – Entry Level (Contract) Location: Remote Pay Rate: $37-$74/hour Position Type: Long-Term Contract Position Overview System One is seeking an Entry Level Probabilistic Risk Assessment (PRA) Engineer to suppo...
Date Posted: 06/25/2026 Recommended
-
Commissioning Engineer
Kemmerer, Wyoming
Job Title: Commissioning Engineer Location: Kemmerer, Wyoming Type: Contract Compensation: $69.00 - $115.00 Work Model: Onsite – onsite Overview System One is seeking multiple Commissioning Engineers to support our client for a 12 month contract. Initi...
Date Posted: 07/21/2026 Recommended
-
I&C Design Engineer Lead
Bellevue, WA
Job Title: I&C Design Engineer Lead Location: Bellevue, WA Type: Long-term Contract Work Model: Remote Responsibilities: Provide system design, prototype development, testing, and integration for Sodium Fast Reactor technologies. Interface with multidi...
Date Posted: 08/03/2026 Recommended
-
I&C Design Engineer
Bellevue, WA
Job Title: I&C Design Engineer Location: Bellevue, WA Type: Long-term Contract Compensation: $69.00 - $115.00 per hour Work Model: Remote – offsite Hours: 40.0 Responsibilities: Act as an I&C Engineer for Sodium Fast Reactor technologies, responsible f...
Date Posted: 08/03/2026 Recommended