Reactor Core Thermal Fluids Engineer

Oklo Inc

Thermal Fluids Engineer analyzing fluid flow and heat transfer in reactor cores for Oklo. Involves modeling coolant flow and collaborating with design teams.

Posted 6/6/2026full-timeSanta Clara • California • 🇺🇸 United StatesMid-LevelSenior💰 $80,000 - $175,000 per yearWebsite

About the role

Key responsibilities & impact

Modeling core thermal-hydraulic behavior using
subchannel codes such as DASSH, MOOSE-Subchannel, or COBRA-TF
one-dimensional systems codes such as SAS4A/SASSYS-1 or RELAP
first principles approaches and in-house flow network models
3-D computational fluid dynamics
Developing and documenting methods to analyze core thermal-hydraulic behavior at steady-state and during transients
Automation, verification, and validation of modeling and simulation tools in support of analyses
Collaborating cross-functionally to define design requirements, and providing technical feedback to quick-iterating design teams

Requirements

What you’ll need

Bachelors, Masters, or PhD in a technical field, such as nuclear, mechanical, or aerospace engineering
Proficiency with thermal fluids (thermal-hydraulics) analysis methods and first principles
Able to write clear and concise documentation
Experience with
low-fidelity and intermediate-fidelity (e.g., porous body and correlation-based) models for heat transfer and fluid flow
numerical methods and software development for heat transfer and fluid flow problems
data processing (e.g., pre-processing, post-processing, scripting)

Benefits

Comp & perks

flexible time off
equity
competitive pay
401k
health insurance
FSA
flexible work hours

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

thermal-hydraulic behavior modelingsubchannel codesDASSHMOOSE-SubchannelCOBRA-TFone-dimensional systems codesSAS4A/SASSYS-1RELAP3-D computational fluid dynamicsnumerical methods

Soft Skills

clear documentationcollaborationtechnical feedback

Certifications

Bachelors in technical fieldMasters in technical fieldPhD in technical field