Principal Reactor Physics & Neutronics Engineer

LEAD / PRINCIPAL REACTOR PHYSICS & NEUTRONICS ENGINEERDeployable Energy Position Summary

Senior, hands-on technical leader responsible for establishing and developing the reactor physics and neutronics capability within a growing nuclear energy organization. Provides technical leadership while remaining directly involved in engineering execution, analysis, technical problem-solving, and project delivery. This role will help establish discipline-specific standards, processes, tools, and technical practices; support multiple concurrent projects; and mentor developing engineers as the organization scales.

• Reactor Physics
  - Apply core reactor-physics principles including neutron behavior, reactivity, flux distributions, power distributions, depletion, and feedback effects to support design, safety, and development activities.
• Neutronics Analysis
  - Perform and review applicable neutron-transport, deterministic, Monte Carlo, diffusion, shielding-interface, depletion, and reactivity analyses supporting reactor behavior, performance, and design decisions.
• Criticality Analysis
  - Evaluate fuel and material configurations, reactivity margins, moderation effects, credible abnormal conditions, and criticality-safety controls where applicable.
• Computational Modeling
  - Develop, execute, and maintain analytical models using appropriate reactor-physics and neutronics tools, with clear assumptions, inputs, methods, and configuration control.
• Core and Coupled-System Analysis
  - Lead and support evaluations of core design, fuel-loading strategies, reactivity management, core performance, and interactions with thermal-hydraulic, mechanical, materials, safety, and other engineering disciplines.
• Physics-Based Simulation
  - Use physics-based calculations and simulations to predict reactor performance, investigate design alternatives, assess operating scenarios, support technical decisions, and reduce technical risk.
• Verification & Validation
  - Verify model implementation and analytical methods; lead benchmarking, validation, uncertainty evaluation, and comparison against applicable experimental or test evidence.
• Sensitivity and Uncertainty Analysis
  - Assess how assumptions, modeling choices, nuclear data, and operating parameters affect analytical results, margins, and technical conclusions.
• Safety and Licensing Support
  - Provide reactor-physics and neutronics inputs to safety evaluations, design-basis development, licensing analyses, regulatory responses, and supporting technical documentation.
• Technical Documentation and Model Configuration
  - Maintain controlled calculations, model records, assumptions logs, review packages, and traceable engineering documentation under quality and configuration-management requirements.
• Technology Development Support
  - Bring relevant experience across reactor physics, neutronics, criticality, fuel, testing, or safety analysis to accelerate first-of-a-kind development, technical maturation, and integration.

• Serve as the senior technical resource and subject matter expert within reactor physics and neutronics.
• Lead and personally execute complex technical work across multiple nuclear projects and programs.
• Establish and maintain discipline-specific engineering standards, methodologies, procedures, and best practices.
• Lead and participate in technical reviews, design reviews, and technical decision-making.
• Identify and resolve complex multidisciplinary engineering issues while maintaining appropriate technical rigor.

• Develop, perform, and review reactor-physics and neutronics analyses supporting nuclear engineering, advanced-reactor development, test activity, and safety-related technical programs.
• Develop and apply computational models for neutron transport, criticality, reactivity, shielding, depletion, fuel behavior, and related physics evaluations using approved methodologies.
• Support evaluation of measured, experimental, benchmark, or test data and comparison against analytical predictions.
• Perform sensitivity, uncertainty, verification, validation, and benchmarking activities.
• Support design development, technical decision-making, safety evaluations, and licensing activities as required.
• Maintain controlled calculations, packages, model configurations, assumptions, methods, and supporting technical documentation.

• Help establish and grow the discipline capability within the organization.
• Mentor and provide technical guidance to junior and…