Senior Engineer, Safety Methods
TerraPowerBellevue, Washington
Full Time
Posted May 21, 2026
$132k - $171k
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Application opens on company website
Listing evidence and provenance
- Source
- greenhouse View original listing
- Freshness
- Open in the current public read path; this is not an employer guarantee.Last observed September 29, 2026
- Classification
- Modern power-system classification not yet published for this listing.Legacy source industry field: Nuclear Energy
- Pay provenance
- Employer-provided pay
Job Description
The Senior Engineer, Safety Methods is part of a growing team supporting the design and licensing of the Natrium Demonstration reactor and is primarily responsible for developing methods to perform Licensing Basis Events (LBE) analyses.
Key Responsibilities
- Develop system-level thermal hydraulic analysis methods, including modeling strategies, numerical approaches, and closure models.
- Perform steady-state and transient system-level analyses to characterize model behavior, assess method performance, and define method fidelity requirements.
- Support method qualification, including numerical verification, applicability envelopes, and performance characterization.
- Formulate and integrate closure models and empirical correlations (e.g., heat transfer, pressure drop, mixing, component-level physics) into existing analysis frameworks.
- Identify modeling gaps and support method enhancement using and sensitivity studies.
- Develop automated workflows and tools for model setup, execution, post processing, and repeatable method application.
- Document modeling methodologies, assumptions, method applicability, and numerical performance for design processes and licensing support activities.
- Work across disciplines to ensure thermal hydraulic methods integrate effectively with plant design, safety analysis, and coupled simulation workflows.
- Apply and improve TerraPower’s SQA and NQA 1 modeling practices, ensuring traceability, configuration control, and reproducibility of methods.
Requirements
- Degree in Mechanical, Nuclear, Chemical Engineering, or similar fields, with 3+ years of experience in system-level thermal hydraulic modeling and method development for nuclear or complex energy systems.
- Demonstrated experience in developing or improving analysis methods, including numerical scheme development, closure model formulation, and stability/accuracy optimization strategies.
- 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 frameworks.
- Strong foundation in thermal fluids and reactor system behavior, including complex thermal hydraulic phenomena relevant to advanced reactor designs.
- Experience in sensitivity analyses and model gap identification that support method development priorities.
- Familiarity with scientific programming and workflow automation (e.g., Python, MATLAB).
- Familiarity with NQA 1 quality assurance for modeling workflows, including documented methodologies, configuration control, and model traceability.
- Strong analytical thinking, clear technical communication, and the ability to support multiple method development efforts in parallel.
- The successful candidate will possess a high degree of trust and integrity, communicate openly and display respect and a desire to foster teamwork
- This position is subject to qualification requirements in accordance with ANSI/ANS 3.1. Candidates must meet the minimum education and experience criteria applicable to the role, including relevant nuclear industry experience where required. Verification of data will be part of the hiring process.
Benefits & Perks
- Competitive Compensation
- Salary, eligible to participate in discretionary short-term incentive payments
- Comprehensive Medical and Wellness Benefits Medical Vision Dental Life and Disability Gender Affirmation Benefits
- Parental Leave
- 401k Plan
- Generous Paid Time Off (PTO) 21 days of annually accrued PTO
- Generous Holiday Schedule 10 paid holidays
- Relocation Assistance
- Professional and Educational Support Opportunities
- TerraPower Career and Benefits information: https://www.terrapower.com/contact-us/careers/
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