Credentials that matter
Skills and tools
- Thermal Hydraulics
- RELAP
- Cobra-tf
- CFD Analysis
Required qualifications
- Bachelor's, Master's, or PhD in nuclear, mechanical, aerospace, or related engineering field
- Proficiency with thermal-hydraulics analysis methods and first-principles heat transfer/fluid flow modeling
- Experience with low- and intermediate-fidelity models (porous body, correlation-based approaches) for heat transfer and fluid flow
- Experience with numerical methods and software development for thermal-fluids problems
- Demonstrated ability to write clear technical documentation
- Experience with data processing, pre/post-processing, and scripting
About this role
Oklo is seeking a Reactor Core Thermal Fluids Engineer to join the Core Thermal-Hydraulics team. You will analyze fluid flow and heat transfer within advanced reactor cores, developing and validating computational methods for modeling coolant behavior across steady-state and transient conditions. This role combines first-principles thermal-hydraulic analysis with modern simulation tools including subchannel codes, systems codes, and CFD.
Responsibilities
- Model core thermal-hydraulic behavior using industry-standard tools including subchannel codes (DASSH, MOOSE-Subchannel, COBRA-TF), systems codes (SAS4A/SASSYS-1, RELAP), flow network models, and 3-D computational fluid dynamics
- Develop and document methods to analyze core thermal-hydraulic behavior under steady-state and transient conditions
- Perform automation, verification, and validation of modeling and simulation tools in support of regulatory and design analyses
- Collaborate cross-functionally with design teams to define thermal-hydraulic requirements and provide technical feedback on core designs
Preferred qualifications
- Proficiency in Python
- Demonstrated success in qualification and validation of nuclear analyses
- Experience with CI/CD computing environments
- Experience with reactor systems codes (RELAP or equivalent)
- Experience with subchannel analysis codes (COBRA-TF or equivalent)
- Experience with high-fidelity computational fluid dynamics analysis
Location, schedule, and travel
Remote role based; required travel to Santa Clara, CA headquarters twice per quarter plus travel to other sites as needed. First two weeks of onboarding must be completed in-person at headquarters.
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Reactor Core Thermal Fluids Engineer
Oklo · $80k–$175k/yr