THERMAL-HYDRAULICS ENGINEER II Deployable Energy Position Summary Early to Mid-career technical professional responsible for supporting thermal-hydraulics and thermal-fluids engineering activities within a growing nuclear energy organization. Works with moderate guidance from senior technical personnel while taking ownership of defined calculations, analyses, models, documentation, and project-support deliverables. This role supports advanced-reactor and power-conversion applications involving helium and supercritical CO2 systems and contributes to disciplined engineering execution, technical problem-solving, verification and validation activities, and licensing-quality documentation while developing deeper capability under senior engineering mentorship. Functional Scope • Thermal-Hydraulics - Support analysis of fluid flow, pressure drop, heat removal, coolant behavior, and system response for reactor, heat-transport, power-conversion, and supporting systems. • Thermal-Fluids Engineering - Apply heat transfer, fluid mechanics, thermodynamics, and component-performance fundamentals to practical design and operating evaluations. • Fluid Dynamics - Evaluate internal-flow behavior including flow distribution, mixing, recirculation, compressible-flow effects, and impacts on system performance. • Heat Transfer - Support assessments of conduction, convection, radiation, heat-exchanger performance, thermal margins, component temperatures, and heat-rejection pathways. • Thermodynamics - Apply first-principles and systems-level analysis to Brayton-cycle, helium, supercritical CO2, and related power-conversion applications. • Systems Analysis - Model and evaluate integrated system behavior, operating envelopes, interfaces, performance limits, and interactions between reactor, heat transport, power conversion, and supporting systems. • Engineering Modeling & Simulation - Develop, maintain, and check analytical, system-level, CFD, or multiphysics models used to support design decisions and technical trade studies. • Verification & Validation - Support model checking, benchmarking, sensitivity studies, test-data correlation, uncertainty evaluation, and documentation of analysis credibility. Key Responsibilities • Perform thermal-fluid and thermal-hydraulic calculations and analyses supporting nuclear engineering programs. • Develop, execute, and document analytical, system-level, CFD, or multiphysics models under established methodologies and senior technical direction. • Evaluate fluid-flow, heat-transfer, thermodynamic, steady-state, transient, sensitivity, and performance behavior for assigned systems and components. • Support design evaluation, technical trade studies, optimization activities, testing, and multidisciplinary technical decision-making. • Support verification, validation, benchmarking, uncertainty evaluation, and correlation against test or available operational data. • Prepare controlled calculations, technical documentation, assumptions, model records, and review packages. • Collaborate with reactor physics, mechanical, systems, safety, testing, and other engineering disciplines. • Follow applicable engineering quality, safety, licensing-support, configuration-management, and document-control requirements. Required Qualifications • Bachelor's degree in Mechanical, Nuclear, Chemical, Aerospace Engineering, or related discipline. • Approximately 3-10 years of relevant technical experience in thermal-hydraulics, thermal-fluids, systems analysis, power generation, nuclear, aerospace, defense, or another safety-critical engineering environment. • Hands-on experience performing engineering calculations, modeling, simulation, analysis, or technical evaluation within the assigned discipline. • Solid technical fundamentals in heat transfer, fluid mechanics, thermodynamics, and engineering problem-solving. • Ability to develop defensible technical work products with appropriate assumptions, methods, traceability, reviewability, and documentation quality. • Ability to communicate clearly, collaborate across multidisciplinary teams, and operate effectively in a growing organization where processes and capabilities are still being developed. • Demonstrated attention to detail, accountability, engineering judgment, and willingness to work within nuclear-safety and quality expectations. Preferred Qualifications • Advanced engineering degree or graduate coursework in a relevant discipline. • Experience with thermal-hydraulic systems analysis, CFD, complex systems modeling, or multiphysics analysis. • Experience with helium-cooled systems, supercritical CO2 power cycles, Brayton-cycle systems, or related reactor thermal-fluid applications. • Experience with verification, validation, benchmarking, sensitivity studies, uncertainty evaluation, or correlation of analytical results against experimental or test data. • Familiarity with regulatory-review processes, licensing methods, nuclear-quality requirements, or preparation of related technical bases. • Direct nuclear-industry experience or adjacent experience in another highly regulated, safety-critical engineering environment. • Exposure to technical process improvement, controlled calculations, configuration management, document control, or change-control practices. Core Competencies • Thermal-Hydraulics • Thermal-Fluids Engineering • Fluid Dynamics • Heat Transfer • Thermodynamics • Systems Performance Analysis • Computational Modeling • Verification & Validation • Regulatory / Licensing Support • Helium and Supercritical CO2 Thermal-Fluid Systems • Nuclear Safety Culture • Engineering Judgment