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Role Description

Thermal-Hydraulics Engineers at Oklo are responsible for analyzing fluid flow and heat transfer within a reactor and associated systems. This work includes engineering analyses of thermal-fluid dynamics, clear and thorough documentation of the analyses, as well as interfacing with design teams. A Core Thermal-Hydraulics Methods Engineer will contribute to the development, qualification, and validation of methods for modeling coolant flow within reactor cores using one-dimensional models and intermediate-fidelity subchannel models.

• Modeling core thermal-hydraulic behavior using:
  • Subchannel codes such as DASSH, or MOOSE-Subchannel
  • One-dimensional systems codes such as SAS4A/SASSYS-1 or SAM
  • First principles approaches and in-house flow network models
• Developing methods to analyze core thermal-hydraulic behavior at steady-state and during transients
• Developing and utilizing analysis methods that efficiently and effectively build confidence in a design
• 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
• Document work using modern tools and techniques, and write well-written, thoughtful technical reports

Qualifications

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

Requirements

• Fluency with Python
• Experience with CI/CD computing environments
• Experience with reactor systems codes, such as SAS4A/SASSYS-1, SAM, RELAP, TRACE, or GOTHIC
• Experience with qualification and validation of analyses
• Experience with subchannel analysis codes, such as DASSH, MOOSE-Subchannel, COBRA-TF, or similar
• Experience with high-fidelity computational fluid dynamics analysis

Benefits

• Salary: $73,000-$157,000
• Flexible time off
• Equity
• Competitive pay
• 401k
• Health insurance
• FSA
• Flexible work hours
• Other benefits

Company Description

Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho National Laboratory, and submitted the first custom combined license application for an advanced reactor to the U.S. Nuclear Regulatory Commission. Oklo is also developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and U.S. National Laboratories.