Valar Atomics
Senior Thermal-Hydraulics Analysis Engineer
Torrance, Los Angeles County · Senior · full-time
No sponsorship$151k-$185kDetected 1 day ago
FEACFDSystems EngineeringAerospace EngineeringCollaborationMentoringAspen HYSYSThermodynamics
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Lottery odds (Level IV)94
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About the role
- The Senior Thermal-Hydraulics Systems Engineer leads system-level (1-D / network) thermal-hydraulics modelling of the reactor's primary and secondary loops, balance of plant and power-conversion cycles using Flownex SE.
- Within the ModSim Engineering Group, the role builds and validates integrated plant models that capture steady-state performance and transient behavior - start-up and shutdown, load changes, loss-of-flow and trip scenarios - and that inform component sizing, control philosophy and cycle optimization (Brayton and supercritical-CO₂).
Responsibilities
- Build, run and maintain integrated Flownex SE network models of primary/secondary loops, balance of plant and power-conversion cycles for steady-state and transient analysis.
- Produce calculation packages and system design-basis documentation under NQA-1; provide inputs to safety analysis and interface with detailed CFD models and neutronics power distributions.
- Lead verification and validation of system models, set systems-modelling standards, support regulator/customer reviews, and mentor junior systems analysts.
- Standardize Flownex modelling methods, component libraries and templates, and support the Stream Lead in scoping, estimating and scheduling systems work.
- The engineer defines the systems-modelling approach, reconciles Flownex results with CFD-derived coefficients and supplier data, and translates system analyses into engineering decisions and inputs for the wider design and safety effort.
- The opportunity to help build and scale transformative energy technology from the ground up
Requirements
- Bachelor's degree or higher in Mechanical, Nuclear, Chemical or Aerospace Engineering with emphasis on thermodynamics, heat transfer or thermal-hydraulics systems.
- Master's degree (MSc/MEng) or higher in Mechanical, Nuclear, Chemical or Aerospace Engineering with emphasis on thermodynamics, heat transfer or thermal-hydraulics systems.
- Experience under a nuclear or regulated quality programme (NQA-1, ISO 9001, 10 CFR 50 Appendix B) and exposure to NRC/ASME environments.
- Track record of mentoring and leading technical systems analysis within a team.
- Characterize and size components (pumps, compressors, heat exchangers, valves, turbomachinery) and evaluate cycle performance and optimization across Brayton and sCO₂ architectures as required.
Nice to have
- Preferred Skills and Experience
- Flownex SE expertise strongly preferred
- otherwise demonstrable depth in a comparable systems/transient code (RELAP5, TRACE, GOTHIC, MELCOR, Modelica/Dymola, Aspen HYSYS Dynamics, Thermoflow / GateCycle) with willingness to adopt Flownex.
- Property libraries / equations of state (e.g., CoolProp / REFPROP) and helium, molten-salt, sodium, or CO₂ working fluids a strong plus.
Compensation
- $151,000 - $185,000 USD
- Competitive base salary
Benefits
- Equity ownership in a rapidly growing advanced energy company
- Comprehensive medical benefits
- Generous PPE stipend
Company info
- As part of the Engineering organization, Models & Simulations develops advanced analytical models that support engineering design, performance prediction, and system optimization.
- The team enables informed decision-making through computational analysis and simulation.
Equal opportunity
- Valar Atomics is an equal opportunity employer.
- We consider all qualified applicants without regard to race, color, religion, sex, gender identity, sexual orientation, national origin, age, disability, veteran status, or any other protected status under applicable law.
- We are committed to providing a workplace free of discrimination and harassment and will provide reasonable accommodation as required by law.
- Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident (green card holder).
Visa & Work Authorization
- Applicants must be legally authorized to work in the United States as a U
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