Intermediate Nuclear Engineer Energy - Remote

AtkinsRéalis•Oak Ridge, TN

3d•$74,000 - $138,700•Remote

About The Position

AtkinsRéalis is seeking an Intermediate Nuclear Engineer Energy for a remote position based out of its Oak Ridge, Tennessee office. The role leads and supports the execution, oversight, and coordination of nuclear engineering activities, ensuring technical deliverables, design interfaces, and nuclear safety information move effectively across engineering disciplines, project functions, and potentially external vendor interfaces. The position works within a multidisciplinary team and requires expertise in Small Modular Reactor (SMR) designs. The engineer integrates specialized functions across neutron and reactor core physics, nuclear safety and analysis, design and shielding, radioactive-material logistics and compliance, and software quality assurance. The role applies neutronics methodologies and codes such as MCNP, SCALE/KENO, Attila4MC, and Serpent, and requires knowledge of US and international nuclear regulatory frameworks, including NRC regulations, DOE orders, and IAEA safety standards and guides. The position requires a bachelor's degree in Nuclear Engineering or a closely related discipline and three years of relevant experience with a bachelor's degree. A master's or Ph.D. is preferred. The posting also describes desired technical leadership experience, including at least seven years of engineering experience and a record of reviewing, verifying, and formally approving other engineers' technical work.

Requirements

Bachelor's degree in Nuclear Engineering or a closely related discipline.
At least 3 years of relevant experience with a bachelor's degree.
Experience in the nuclear industry is preferred.
Knowledge of neutron and reactor core physics, nuclear safety analysis, nuclear criticality safety, radiation shielding, fuel-cycle operations, radioactive-material transportation, and software quality assurance.
Knowledge of US and international nuclear regulatory frameworks, including NRC regulations, DOE orders, and IAEA safety standards and guides.
Desired experience with NRC regulations, including 10 CFR Parts 50, 70, and 71, and ANSI/ANS-8 standards.
Desired advanced, hands-on proficiency with MCNP and SCALE/KENO, or equivalent codes such as Attila4MC or Serpent.
Desired experience authoring and approving NCSEs and NCSAs for fuel processing, storage, or transport.
Desired experience designing radiation shielding and performing radiation-transport and core-physics calculations.
Desired experience managing code verification, validation, and benchmarking under ASME NQA-1 or an equivalent nuclear quality assurance program.
Desired direct experience modeling or licensing SMRs or advanced fuel systems such as HALEU or TRISO fuel cycles.
Desired at least 7 years of engineering experience and a demonstrated record of reviewing, verifying, and formally approving other engineers' technical work.
Experience collaborating in integrated, cross-functional engineering teams, including interfaces with mechanical, thermal-hydraulic, or structural systems, is desired.
Documented experience authoring formal safety basis documents, calculation packages, or regulatory submittals is desired.

Nice To Haves

Master's or Ph.D. in Nuclear Engineering or a closely related discipline.
Experience in the nuclear industry.
Direct experience modeling or licensing Small Modular Reactors or advanced fuel systems such as HALEU or TRISO fuel cycles.
Experience managing software code verification, validation, and benchmarking under ASME NQA-1 or an equivalent nuclear quality assurance program.
Experience authoring and approving NCSEs and NCSAs for fuel processing, storage, or transport.
Experience designing radiation shielding and performing complex radiation-transport and core-physics calculations.
Advanced hands-on proficiency with MCNP and SCALE/KENO, or equivalents such as Attila4MC or Serpent.
Comprehensive knowledge of NRC regulations, ANSI/ANS-8 standards, DOE orders and directives, and nuclear facility safety bases.
At least 7 years of engineering experience with a record of reviewing, verifying, and formally approving other engineers' technical work.
Experience collaborating across engineering disciplines, including mechanical, thermal-hydraulic, or structural systems.
Documented experience authoring formal safety basis documents, calculation packages, or regulatory submittals.

Responsibilities

Lead and coordinate technical work supporting US nuclear safety licensing activities.
Author, review, and approve technical documentation, including nuclear safety analyses and evaluation reports.
Support licensing initiatives by assisting with preparation of safety basis documents.
Participate in hazard analyses, process design reviews, and configuration management activities.
Lead, execute, and approve Nuclear Criticality Safety Evaluations (NCSEs) and Nuclear Criticality Safety Analyses (NCSAs) for fuel fabrication, handling, storage, and transportation processes.
Establish and validate criticality safety limits and engineered or administrative controls for small modular reactor systems.
Develop and maintain the Criticality Safety Program in alignment with ANSI/ANS-8 standards and applicable NRC and DOE regulations.
Use validated neutronics methodologies and Monte Carlo codes, such as MCNP and SCALE/KENO, to assess margins to criticality, bias, and uncertainty.
Lead, perform, and approve radiation shielding designs and radiation-transport analyses for fuel fabrication, handling, storage, and transportation.
Analyze and interpret radiation data to ensure operational safety, shielding effectiveness, and regulatory compliance.
Coordinate nuclear engineering activities and technical interfaces across disciplines, project functions, and potentially external vendors.
Perform other duties as assigned.