Thermal Hydraulics Engineer

Nuclear Mid-level (L4 equivalent) 2-5 years

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The job description

Tech stack. RELAP5, TRACE, or GOTHIC, CFD (STAR-CCM+, Fluent), two-phase flow analysis, heat transfer correlations, experimental test data, Python and MATLAB, uncertainty quantification

About the role

You will master the fluid and thermal behavior of reactor systems for a nuclear engineering organization, analyzing how coolant moves heat under normal operations and accidents. The team models everything from single-phase forced flow to complex two-phase transients, validating codes against experimental data. You will build models, run simulations, and defend results that safety cases depend on. This role matters because thermal-hydraulic analysis proves the core stays cooled in every scenario the license covers, and your models are the evidence behind that proof. You will also participate in code assessment programs, benchmarking your models against international standard problems. Your uncertainty analyses will be rigorous and honest, because safety margins built on optimistic assumptions are not margins at all. You will document every modeling choice so future analysts can reproduce and defend your work. Your peer reviews of others' models will be thorough and constructive, catching nodalization errors and inappropriate correlations before they propagate into licensing analyses.

What you will achieve

Deliver validated thermal-hydraulic models supporting licensing analyses with quantified uncertainty margins.
Complete transient analyses for design-basis events with results meeting all acceptance criteria on schedule.
Validate code predictions against experimental data, documenting agreement within established acceptance bands.
Optimize system designs improving thermal margins 10 percent through careful hydraulic analysis.
Mentor junior analysts on modeling best practices, reducing their model development errors measurably.

What you will bring

Must-haves

2 to 5 years in thermal-hydraulic analysis for nuclear or other high-consequence industries.
Deep understanding of two-phase flow, heat transfer, and fluid mechanics fundamentals.
Proficiency with system codes such as RELAP5, TRACE, or GOTHIC, including nodalization judgment.
Experience validating models against experimental data with honest assessment of agreement.
Knowledge of uncertainty quantification methods and their regulatory application.
Ability to write analysis reports with clear assumptions, methods, and conclusions.
Debugging tenacity: complex models fail cryptically, and you find the real cause.

Nice-to-haves

CFD experience with STAR-CCM+, Fluent, or equivalent for detailed local phenomena.
Familiarity with NRC-approved evaluation models and their restrictions.
Experience with separate-effects or integral test facility data.
Knowledge of containment thermal-hydraulics and severe accident phenomena.