Senior Engineer, Plant Thermal Hydraulics Validation

Job Title: Senior Engineer, Plant Thermal Hydraulics Validation
Location: Bellevue, WA
Type: Contract (yearlong) typically extends on a yearly basis
Compensation: $56.00-$95.00
Contractor Work Model: Remote – offsite
Paid Holidays | PTO

Overview




System One is seeking a Senior Engineer, Plant Thermal Hydraulics Validation to support our client on a remote basis.

Responsibilities

• Support verification, validation, and uncertainty quantification activities for plant scale thermal-hydraulic analysis tools.
• Perform system-level steady-state and transient thermal-hydraulic simulations to evaluate model behavior, accuracy, and limitations.
• Interpret and apply experimental data from separate effects and integral test facilities to support model validation and closure of technical gaps.
• Define validation needs, develop test requirements, and collaborate closely with test engineering teams to ensure alignment between model gaps and experimental programs.
• Document V&V methodologies, model assumptions, validation results, and uncertainty analyses for internal design processes and regulatory submittals.
• Collaborate with multidisciplinary teams to support plant design, safety analysis, and licensing workflows.
• Apply and improve SQA and NQA1 modeling quality practices and ensure traceability and configuration control of analysis inputs, models, and results.

Requirements

• Degree in Mechanical, Nuclear, Chemical Engineering, or similar field, with a minimum 6+ years of experience for level 10; advanced-degree equivalencies apply.
• Experience should include system-level thermal hydraulic analysis and code assessment for nuclear or complex energy systems.
• Demonstrated experience in code assessment, including model-to-test comparison, validation metric development, and uncertainty quantification.
• Hands on experience working with experimental thermal hydraulic data, including data analysis, uncertainty evaluation, and comparison against system level predictions.
• Experience with system analysis tools (e.g., RELAP5 3D, TRACE, SAS, or equivalent) applied to plant scale transient and steady-state evaluations.
• Strong foundation in thermal-fluid and reactor system behavior considerations relevant to advanced reactor designs.
• Experience with SQA and NQA 1 quality assurance practices for modeling workflows is highly preferred.
• Strong analytical thinking, clear technical communication, and the ability to manage multiple validation tasks in parallel.

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.

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