Reactor Core Thermal Fluids Engineer

Thanks for your interest in Oklo!  We are searching for a Thermal Fluids Engineer to join our Core Thermal-Hydraulics team. 

The Core Thermal-Hydraulics team at Oklo is responsible for analyzing fluid flow and heat transfer within a reactor core. The work includes engineering analyses of thermal-fluid dynamics, clear and thorough documentation of the analyses, as well as interfacing with design teams. A engineer on the team will contribute to the development, qualification, and validation of methods for modeling coolant flow within reactor cores using one-dimensional models, intermediate-fidelity subchannel models, and high-fidelity computational fluid dynamics models.

• →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

• 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)

• Fluency with Python
• Demonstrated success in qualification and validation of analyses
• Experience with
  • CI/CD computing environments
  • reactor systems codes (RELAP or similar)
  • subchannel analysis codes (COBRA-TF or similar)
  • high-fidelity computational fluid dynamics analysis

Oklo requires remote employees to travel to headquarters (Santa Clara, CA) twice a quarter annually, based on business or team needs, including attendance at team meetings, off-sites, and other company events or gatherings. Some travel to other sites is also required for this position. For the first two weeks of onboarding, employees are required to be in person at headquarters in Santa Clara, CA.

We are looking for a Thermal Fluids Engineer that is:

• Willing and able to learn quickly
• Deeply skilled in analysis of heat transfer and fluid flow in confined geometries
• Eager to work on a dynamic team, receive constructive feedback, and grow with us
• Excited to think creatively, critically, and reflectively about the problems they are solving
• Familiar with the importance of high-quality documentation

Oklo is aware of recent recruitment fraud attempts targeting job seekers. Please be cautious of anyone claiming to represent Oklo who does not contact you from an official Oklo email address.

All legitimate communications from our recruiting team— including application updates, interview requests, and job offers — will come exclusively from an @oklo.com email. Oklo will never ask for sensitive personal information, payments, or account credentials during the hiring process.

If you receive suspicious outreach or have concerns about the authenticity of any communication claiming to be from Oklo, please contact us through the official channels listed on our website.