Senior Nuclear Engineer Energy - Remote

AtkinsRéalis; Oak Ridge (TN); Remote; USD 90,000 - 150,000; Full time

Benefits offered by this job

medical

dental

vision

company-paid life and short- and long-

disability benefits

employer-matched 401(k) with 100% vest

employee stock purchase plan

Paid Time Off

leaves of absences options

flexible work options

recognition and employee satisfaction

employee assistance program

voluntary benefits

Job summary

AtkinsRéalis is seeking a Senior Nuclear Engineer Energy – Remote, based out of Oak Ridge, TN. You will lead licensing activities, perform safety analyses, and coordinate cross-disciplinary teams in SMR-focused projects.

The ideal candidate has 7+ years in nuclear engineering, with strong regulatory knowledge and hands-on use of MCNP/SCALE/Attila4MC for neutronics and shielding analyses.

Qualifications

• Bachelor's degree in Nuclear Engineering; advanced degrees preferred.
• Minimum 7 years of nuclear engineering experience for senior role.
• Experience in licensing, safety analyses, and regulatory interfaces.

Responsibilities

• Lead and coordinate nuclear safety licensing activities.
• Author review and approve safety analyses and reports.
• Support safety basis documents and licensing initiatives.
• Oversee hazard analyses, design reviews, and configuration management.
• Coordinate with multidisciplinary teams and external interfaces.

Skills

SMR design

Neutron & reactor core physics

Nuclear safety analysis

Regulatory knowledge

Team leadership

Multidisciplinary collaboration

Technical writing

Education

Bachelor's degree in Nuclear Engineering

Master's or PhD preferred

Tools

MCNP

SCALE

Attila4MC

Job description

Overview

We are seeking a Senior Nuclear Engineer Energy – Remote. This remote position is based out of our Oak Ridge, TN office.

Your role

• This role requires a senior level engineer with a minimum of 7 years of nuclear engineering experience, responsible for leading and supporting the execution, oversight, and coordination of nuclear engineering activities.
• Ensures technical deliverables, design interfaces, and nuclear safety information flow efficiently across engineering disciplines, project functions, and potentially external vendor interfaces.
• Operates within a multidisciplinary team, this position requires deep expertise in Small Modular Reactor (SMR) designs.
• Integrates specialized functions across multiple engineering disciplines, utilizing knowledge gained in the following core competencies:
• Neutron & Reactor Core Physics: Analyzing core behavior and reactor physics.
• Nuclear Safety & Analysis: Leading nuclear safety-related analyses and nuclear criticality safety assessments.
• Design & Shielding: Developing radiation shielding designs and managing fuel cycle operations.
• Logistics & Compliance: Overseeing radioactive material transportation and enforcing software quality assurance (SQA) standards.
• Software: Proficient with Attila4MC, MCNP, SCALE, and/or Serpent codes and modules
• Regulatory Expertise: Comprehensive knowledge of US and international nuclear regulatory frameworks, including NRC regulations (e.g., 10 CFR Parts 50, 70, or 71), DOE orders, and IAEA safety standards and guides.

Key Responsibilities

• Nuclear Safety & Licensing Strategy.
• Lead and coordinate technical work supporting US nuclear safety licensing activities.
• Author, review, and approve technical documentation, including various nuclear safety analyses and evaluation reports.
• Support licensing initiatives by assisting with the preparation of safety basis documents.
• Participate actively in hazard analyses, process design reviews, and configuration management activities.

Criticality Safety & Advanced Reactor Systems

• 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/administrative controls (mass, moderation, geometry, reflection, enrichment, and interaction) specifically for small modular reactor systems.
• Advance the development and maintenance of the Criticality Safety Program in strict alignment with ANSI/ANS-8 standards and applicable NRC/DOE regulations.

Neutronics, Shielding & Software Quality Assurance (SQA)

• Apply validated neutronics methodologies and Monte Carlo codes (e.g., MCNP, SCALE/KENO) to develop or 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 total regulatory compliance.
• Performs other duties as assigned.

About You

• Requires a Bachelor's degree in Nuclear Engineering or a closely related discipline. Master'S or Ph.D. preferred.
• Requires 7 years of relevant experience with Bachelor's degree.
• Experience in nuclear industry preferred.
• Candidates holding a Master's degree, Ph.D., or a Professional Engineer (PE) license will be considered with 5 years' experience.

Desired Skills

• Technical Competencies-
• Advanced Reactor & SMR Design: Direct experience modeling or licensing Small Modular Reactors (SMRs) or advanced fuel systems (such as HALEU or TRISO fuel cycles).
• Software Quality Assurance (SQA): Experience managing code verification, validation, and benchmarking under a formal ASME NQA-1 or equivalent nuclear quality assurance program.
• Criticality Safety Analysis: Demonstrated experience authoring and approving Nuclear Criticality Safety Evaluations (NCSEs) and Analyses (NCSAs) for fuel processing, storage, or transport.
• Neutronics & Radiation Shielding: Proven ability to design radiation shielding and perform complex radiation-transport and core physics calculations.
• Nuclear Software Proficiency: Advanced, hands-on proficiency with core particle transport and criticality codes, specifically MCNP and SCALE/KENO (or equivalents like Attila4MC or Serpent).
• Regulatory Compliance: Comprehensive knowledge of US regulatory frameworks, including Nuclear Regulatory Commission (NRC) regulations (specifically 10 CFR Parts 50, 70, and 71) and ANSI/ANS-8 standards as well as Department of Energy (DOE) Orders, Guides, and Technical Standards and directives regarding nuclear facility safety bases.
• Leadership & Soft Skills-
• Technical Leadership: At least 7 years of engineering experience with a proven track record of reviewing, verifying, and formally approving the technical work of other engineers.
• Multidisciplinary Collaboration: Experience working within integrated, cross-functional engineering teams (e.g., interfacing with mechanical, thermal-hydraulic, or structural systems).
• Technical Writing: Communication skills, with documented experience authoring formal safety basis documents, calculation packages, or regulatory submittals.

Rewards & benefits

• medical
• dental
• vision
• company-paid life and short- and long-term disability benefits
• employer-matched 401(k) with 100% vesting
• employee stock purchase plan
• Paid Time Off
• leaves of absences options
• flexible work options
• recognition and employee satisfaction programs
• employee assistance program
• voluntary benefits

About AtkinsRéalis

We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's'infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people.

Additional information

Expected compensation range is between $90,000 - $150,000 annually depending on skills, experience, and geographical location.

AtkinsRéalis is an equal opportunity, Drug-Free employer EOE/Veteran/Disability

Please review AtkinsRéalis' Equal Opportunity Statement here.