Senior Engineer, Thermal Hydraulic Test

TerraPower LLC.; Everett (WA); On-site; USD 124,000 - 161,000; Full time

Benefits offered by this job

Competitive compensation

Discretionary incentive payments

Medical and wellness benefits

401k plan

PTO 21 days

Job summary

TerraPower, a nuclear technology company based in Bellevue, Washington, seeks a Senior Thermal Hydraulic Test Engineer to design and conduct thermal hydraulic tests supporting analytic analyses for the Natrium Demonstration Plant. The successful candidate will plan, test, review documents, engage with vendors, and generate deliverables.

Responsibilities include developing thermal-hydraulic analysis methods, performing heat transfer and fluid dynamics calculations, and evaluating reactor

Qualifications

• Master's degree in Engineering or related field.
• 3+ years of relevant experience in a testing/R&D environment preferred.
• Experience in a laboratory setting and post-processing of experiments.

Responsibilities

• Develop and apply thermal-hydraulic analysis methods (steady state and transient).
• Perform heat transfer, fluid dynamics, and thermodynamics calculations.
• Analyze reactor operations and events per applicable codes to define loadings and limits.
• Conduct multiscale neutronics and control analyses for thermal hydraulics of various fluids.
• Collaborate with other engineering groups on design and testing and validate methodologies.

Skills

Thermal-hydraulic analysis

Multidisciplinary teamwork

Technical writing

Problem solving

Safety consciousness

Education

Master's degree in Engineering

Tools

Laboratory testing tools

Job description

TerraPower is a nuclear technology company based in Bellevue, Washington. At its core, the company is working to raise living standards globally through a more affordable, secure, and environmentally friendly form of nuclear energy along with innovations in medical isotopes to improve human health. In 2006, TerraPower originated with Bill Gates and a group of like-minded visionaries who evaluated the fundamental challenges to raising living standards around the world. They recognized energy access was crucial to the health and economic well-being of communities and decided that the private sector needed to take action and create energy sources that would advance global energy deployment. TerraPower's mission is to be a world leader in new nuclear technologies, while developing innovators and future leaders in the nuclear field. As a result, the company's activities in the fields of nuclear energy and related sciences are yielding significant innovations in the safety and economics of nuclear power, hybrid energy and medical applications - all for significant human health benefits.

TerraPower is seeking to hire highly motivated and forward-thinking professionals who are interested in focusing on advanced nuclear reactor research and development and influencing change within the nuclear power landscape and bringing forward the critical production of medical isotopes. TerraPower is an Equal Opportunity Employer. We do not discriminate in hiring on the basis of sex, gender identity, sexual orientation, race, color, religious creed, national origin, physical or mental disability, protected Veteran status, or any other characteristic protected by federal, state, or local law.

Senior Engineer, Thermal Hydraulic Test

Reporting to the Manager of Thermal Hydraulic Testing, the Senior Thermal Hydraulic Test Engineer is responsible for designing and conducting thermal hydraulic tests to support analytic analysis of for the Natrium Demonstration Plant. The successful candidate will support all aspects of thermal hydraulic testing activities including planning, testing, document review, engaging with external vendors, and generating documents.

Responsibilities

• Develop and apply thermal-hydraulic analysis methods, including steady state and transient one-dimensional network hydraulic analyses.
• Perform calculations using first principles of heat transfer, fluid dynamics, and thermodynamics to support and validate analysis results.
• Perform analysis of reactor normal operations, upset events, emergency events and faulted events as defined in the ASME BPVC Section III to establish design, service, and test loadings and limits.
• Perform multiscale and multidisciplinary neutronics and control analyses involving the thermal hydraulics of sodium, molten salt, and non-condensable fluids.
• Integrate with other engineering groups performing aspects of component, system, fuel, and control system design and related thermal-hydraulic testing.
• Perform code benchmarking and validation analyses to support code qualification and methodology development.

Key Qualifications and Skills

• Master's degree in applicable field of Engineering
• +3 years of relevant experience in a testing / research and development environment preferred.
• Experience working in a laboratory environment
• Strong thermal-hydraulic analytical skills with one dimensional hydraulic network analysis, system codes experience and transient analysis.
• Experience with post-processing and documenting experiments.
• Experience with multiple types of testing (R&D, Acceptance, Validation, Qualification)
• Ability to work with a multidisciplinary team of engineers
• Ability to handle projects that include multiple objectives and ability to resolve conflicts between objectives.
• Ability to work on multiple tasks concurrently during a given work week.
• Excellent writing and communication skills.
• Safety conscience.
• Ability to work with minimum direction to solve challenging research and development problems.
• The successful candidate will possess a high degree of trustworthiness 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.

Job Functions:

Job Functions are physical actions and/or working conditions associated with the position. These functions may also constitute essential functions for the job which the employee must be able to fulfill, with or without accommodation. Information provided below is to help describe the job so that the applicant has a reasonable understanding of the job duties/expectations. An applicant's ability to perform and/or tolerate these actions and conditions will be discussed and workplace accommodations may be made on a case-by-case basis following an individualized assessment of the applicant and other considerations, including but not limited to any governing safety standards.

• Motor Abilities: Sitting for extended periods, bending/stooping, grasping/gripping, fine motor control (hands)
• Physical exertion and/or requirements: Minimal, with ability to safely lift up to 25 pounds.
• Special Senses: Visual and audio focused work
• Work Conditions: Stairs, typing/keyboard, standard and/or sitting working environment of >8 hours/day
• Travel required 0-10%

Job details

Salary Range: $124,115 - $161,188

Any salary offered within the posted salary band is based on market data and commensurate with the selected candidate’s qualifications and experience. This range is specific to Washington State.

Job Type: Full-time

• Competitive Compensation
• Salary, eligible to participate in discretionary short-term incentive payments
• Comprehensive Medical and Wellness Benefits
  • Medical
  • Vision
  • Dental
  • Life and Disability
  • Gender Affiliation Benefits
• 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

The application deadline for this role is November 2, 2026