Thermal-Hydraulics and Safety Analysis Engineer - Isotopes

The role

The Thermal-Hydraulics and Safety Analysis Engineer will develop and execute systems-level thermal-hydraulic analyses to support the safety case and licensing of reactor systems. This role involves transient modeling, establishing modeling approaches, and producing technical documentation for regulatory review.

What you will do

• Develop, maintain, and execute systems-level thermal-hydraulic models using RELAP5 or comparable codes
• Analyze normal operating conditions, anticipated operational occurrences, design-basis events, and selected beyond-design-basis conditions
• Develop event-specific analysis plans including initial and boundary conditions and treatment of uncertainties
• Develop and document thermal-hydraulic safety-analysis methods and engineering practices
• Establish and justify code, model, and correlation applicability
• Perform model verification, validation, sensitivity studies, and uncertainty analyses
• Translate regulatory requirements into technical evaluation strategies
• Prepare calculation packages, methodology documents, and safety-analysis reports
• Evaluate design changes and provide feedback on transient response and safety margins
• Collaborate with reactor physics, fuel, controls, mechanical, and licensing engineers

Required qualifications

• Bachelor's, master's, or doctoral degree in nuclear, mechanical, chemical, or aerospace engineering, or a closely related technical field
• Five or more years of relevant experience in reactor thermal-hydraulics, nuclear safety analysis, reactor transient analysis, or a closely related field
• Demonstrated experience developing and executing systems-level transient models using RELAP5
• Strong foundation in heat transfer, fluid mechanics, thermodynamics, and reactor thermal-hydraulics
• Experience defining and analyzing reactor transients or accident scenarios
• Experience evaluating the reasonableness and applicability of models, correlations, assumptions, and results
• Experience documenting engineering analyses in technical reports or calculation packages
• Ability to work independently while collaborating effectively across engineering and licensing disciplines
• Experience with verification and validation, uncertainty quantification, sensitivity analysis, scaling, bias evaluation, or code applicability assessments
• Familiarity with experiment design, testing, benchmark problems, and the use of test data to validate analytical methods

Nice to have

• Experience supporting NRC or DOE licensing applications, audits, or regulatory interactions
• Fluency with Python or another language used for model automation, data analysis, visualization, and quality checks
• Competency with modern software engineering practices, including version control and automated testing
• Experience working under a nuclear quality-assurance program or with safety-related analysis software and records
• Experience mentoring other analysts or providing technical review of safety-analysis work

Benefits

• Flexible time off
• Equity
• Bonuses
• Competitive pay
• 401(k)
• Health insurance with employer contribution
• HSA
• FSA
• Flexible work hours
• Wellness credits

Before you apply

• Only applicants who meet the definition of a U.S. person under applicable laws may be eligible
• Employment may be contingent upon successful completion of a drug screening
• Employees may be subject to drug testing at any time

About the company

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.