Application Guide

How to Apply for Computational Fluid Dynamics Thermal-Hydraulics Engineer

at Oklo

🏢 About Oklo

Oklo is pioneering next-generation fast fission technology with a mission to recycle nuclear waste into clean, reliable energy. Unlike traditional nuclear companies, Oklo focuses on compact, advanced reactor designs that can operate for decades without refueling. Working here means contributing to a sustainable energy future while tackling one of nuclear energy's biggest challenges: waste management.

About This Role

This CFD Thermal-Hydraulics Engineer will develop high-fidelity analyses of reactor core, vessel, and heat exchanger systems using tools like STAR-CCM+ or ANSYS Fluent. The role directly impacts Oklo's reactor safety and efficiency by modeling thermal-hydraulic behavior across the entire power plant system. Your work will build confidence in designs through rigorous analysis of thermal, fluid, and safety performance.

💡 A Day in the Life

A typical day involves setting up CFD simulations for reactor components using STAR-CCM+, analyzing results to identify thermal hotspots or flow instabilities, and meeting with design engineers to discuss findings. You'll spend time scripting automated workflows for repetitive analyses and documenting methods to support safety case development for regulatory submissions.

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🎯 Who Oklo Is Looking For

  • Has advanced CFD experience specifically with nuclear or high-temperature thermal-hydraulic systems, not just general fluid dynamics
  • Demonstrates proficiency in STAR-CCM+, ANSYS Fluent, or OpenFOAM through project examples involving conjugate heat transfer or multiphase flows
  • Can bridge analysis with practical design requirements, showing how CFD results informed engineering decisions in previous roles
  • Possesses scripting skills (Python, MATLAB, or similar) for automating pre/post-processing of complex thermal-hydraulic simulations

📝 Tips for Applying to Oklo

1

Highlight specific CFD projects involving nuclear systems, heat exchangers, or high-temperature applications - generic automotive or aerospace CFD experience won't stand out

2

Quantify your impact: show how your CFD analyses reduced uncertainty, improved efficiency, or validated safety margins in previous thermal-hydraulic work

3

Mention experience with regulatory aspects of nuclear thermal-hydraulics or familiarity with ASME codes relevant to reactor components

4

Demonstrate cross-functional collaboration examples where your analyses directly influenced mechanical design decisions

5

Research Oklo's Aurora reactor design and reference specific thermal-hydraulic challenges you're excited to tackle (e.g., passive safety systems, compact heat exchangers)

✉️ What to Emphasize in Your Cover Letter

['Your hands-on experience with CFD tools mentioned (STAR-CCM+, ANSYS Fluent, or OpenFOAM) on nuclear or high-temperature thermal systems', "How you've used thermal-hydraulic analyses to build confidence in designs and influence engineering decisions", "Your understanding of Oklo's mission to recycle nuclear waste and how your skills contribute to advanced fast reactor technology", 'Specific examples of collaborating with design teams to define requirements and provide technical feedback']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Oklo's Aurora powerhouse design and its passive safety features that rely on thermal-hydraulic principles
  • → The company's fuel recycling approach and how it impacts reactor thermal-hydraulic design requirements
  • → Oklo's regulatory progress and partnerships (NRC interactions, DOE collaborations)
  • → Technical publications or presentations by Oklo engineers on advanced reactor thermal-hydraulics

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Walk through a complex thermal-hydraulic analysis you performed: geometry, boundary conditions, turbulence model selection, and how results informed design
2 How would you approach modeling heat transfer in Oklo's compact fast reactor core with liquid metal coolant?
3 Describe your experience with verification and validation of CFD simulations for nuclear applications
4 How have you automated pre/post-processing workflows for repetitive thermal-hydraulic analyses?
5 Discuss a time your CFD analysis revealed an unexpected thermal or fluid behavior and how you addressed it
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⚠️ Common Mistakes to Avoid

  • Submitting generic CFD experience without nuclear or high-temperature thermal-hydraulic context
  • Failing to demonstrate how your analyses translated to engineering decisions or design improvements
  • Not showing awareness of nuclear-specific thermal-hydraulic challenges (decay heat removal, two-phase flows, material temperature limits)

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to Oklo!

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