Remote Reactor Physics Jobs in Missouri (NOW HIRING)

The Senior Safety Methods Engineer will develop, improve, and qualify engineering methods used for reactor safety analysis and licensing activities. The role requires close collaboration with technical teams to enhance modeling capabilities, ensure analytical accuracy, and support reliable decision-making throughout advanced reactor development programs.

• Develop system-level thermal-hydraulic analysis methods, including modeling strategies, numerical approaches, and closure models.
• Perform steady-state and transient system-level analyses to evaluate model behavior, accuracy, and performance limitations.
• Support method qualification activities, including numerical verification, applicability assessments, and performance characterization.
• Develop and integrate closure models and empirical correlations related to heat transfer, pressure drop, mixing, and component-level physics.
• Identify modeling limitations and support method improvements through sensitivity studies and technical evaluations.
• Create automated workflows and engineering tools for model preparation, execution, post-processing, and repeatable analysis processes.
• Document modeling methodologies, assumptions, applicability ranges, and numerical performance for engineering design and licensing activities.
• Collaborate with multidisciplinary teams to ensure thermal-hydraulic methods effectively support plant design, safety analysis, and coupled simulation workflows.
• Contribute to the development and maintenance of system transient analysis codes and reactor simulation capabilities.
• Perform reactor transient analyses, benchmarking activities, and comparisons against integral and separate effect test data.
• Support code assessment, adequacy evaluations, verification, and validation activities.
• Apply and improve quality assurance practices for modeling activities, ensuring traceability, configuration control, and reproducibility of engineering methods.

The ideal candidate is an experienced engineering professional with expertise in thermal-hydraulic modeling, safety analysis methods, and computational approaches for nuclear or complex energy systems. They should combine strong technical knowledge with analytical thinking, effective communication, and the ability to manage multiple engineering activities.

• Degree in Mechanical Engineering, Nuclear Engineering, Chemical Engineering, or a related technical discipline.
• 3+ years of experience in system-level thermal-hydraulic modeling and method development for nuclear or advanced energy systems.
• Demonstrated experience developing or improving engineering analysis methods, including numerical approaches, closure models, and model optimization strategies.
• Experience performing system-level thermal-hydraulic analyses using tools such as RELAP5-3D, GOTHIC, SAS, or equivalent simulation platforms.
• Strong understanding of thermal-fluid behavior and reactor system phenomena relevant to advanced reactor designs.
• Experience conducting sensitivity analyses and identifying modeling gaps to support method improvement activities.
• Familiarity with scientific programming and workflow automation tools such as Python or MATLAB.
• Knowledge of verification and validation processes for computational models and engineering simulations.
• Familiarity with NQA-1 quality assurance practices, including documented methodologies, configuration control, and model traceability.
• Strong analytical and problem-solving skills with the ability to evaluate complex technical challenges.
• Clear technical communication skills and the ability to collaborate effectively across engineering disciplines.
• High level of integrity, professionalism, and commitment to teamwork.

• Competitive hourly compensation range of approximately $37-$74 per hour.
• Remote work flexibility.
• Opportunity to contribute to advanced nuclear reactor development and safety engineering initiatives.
• Collaboration with multidisciplinary experts in thermal hydraulics, reactor physics, and engineering analysis.
• Exposure to innovative simulation methods, licensing activities, and next-generation energy technologies.
• Opportunity to expand expertise in advanced modeling, verification, and validation processes.
• Professional growth through involvement in technically challenging engineering projects.