Senior Thermal-Hydraulics Systems Engineer — Equity

Valar Atomics Inc.; New Mexico; On-site; USD 151,000 - 185,000; Full time

Benefits offered by this job

Competitive base salary

Equity ownership

Medical benefits

Unlimited PTO

Lunch provided onsite

PPE stipend

Career growth opportunities

Collaboration with industry leaders

Job summary

Valar Atomics is seeking a Senior Thermal-Hydraulics Systems Engineer to lead system-level modelling of reactor primary/secondary loops and power-conversion cycles using Flownex SE. You will validate plant models and translate analyses into design decisions for safety and cycle optimization, including Brayton and sCO₂ architectures.

You will size components, run transients, and mentor junior analysts while collaborating with CFD/FEA teams and safety reviewers in a fast-paced startup environment.

Qualifications

• Bachelor's degree or higher in Mechanical, Nuclear, Chemical or Aerospace Engineering with emphasis on thermodynamics, heat transfer or thermal-hydraulics.
• 5+ years of professional thermal-hydraulics / plant-systems analysis experience, including lead responsibility on integrated system or cycle models.

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.
• Characterize and size components (pumps, compressors, heat exchangers, valves, turbomachinery) and evaluate cycle performance and optimization across Brayton and sCO₂ architectures as required.
• Analyze plant transients and control response (start-up/shutdown, load-follow, loss-of-flow, trips) and provide system boundary conditions to CFD/FEA streams.

Skills

Thermal-hydraulics

System modelling

Mentoring

Regulatory knowledge

Education

Bachelor's degree or higher in Mechanical or Nuclear Engineering

5+ years experience in thermal-hydraulics

Tools

Flownex SE

CFD

RELAP5/TRACE/GOTHIC

NQA-1 quality frameworks

Job description

Valar Atomics is seeking a Senior Thermal-Hydraulics Systems Engineer to lead system-level modelling of reactor primary/secondary loops and power-conversion cycles using Flownex SE. You will validate plant models and translate analyses into design decisions for safety and cycle optimization, including Brayton and sCO₂ architectures.

You will size components, run transients, and mentor junior analysts while collaborating with CFD/FEA teams and safety reviewers in a fast-paced startup environment.