Intermediate Nuclear Engineer Energy - Remote

AtkinsRéalis; Oak Ridge (TN); Remote; USD 74,000 - 139,000; Full time

Job summary

AtkinsRéalis in the United States is seeking an Intermediate Nuclear Engineer Energy – Remote based out of Oak Ridge, TN. The role focuses on leading nuclear safety licensing activities and developing analyses for SMR and advanced reactor systems.

The candidate will apply neutronics methods, shielding design, and regulatory knowledge (NRC/DOE) to ensure compliant safety bases, interfaces, and documentation across multidisciplinary teams.

Qualifications

• Requires a Bachelor's degree in Nuclear Engineering (Master's or Ph.D. preferred).
• Minimum 3 years of relevant nuclear engineering experience.
• Experience in the nuclear industry is preferred.

Responsibilities

• Lead and coordinate technical work supporting US nuclear safety licensing activities.
• Author, review, and approve technical documentation including safety analyses.
• Support licensing initiatives with the preparation of safety basis documents.
• Participate in hazard analyses, design reviews, and configuration management activities.

Skills

SMR design

Nuclear safety

Neutronics

Criticality safety

Radiation shielding

MCNP/SCALE/Attila4MC/Serpent

Regulatory compliance

Technical leadership

Cross-disciplinary collaboration

Technical writing

Education

Bachelor's in Nuclear Engineering

Master's/PhD preferred

Tools

Attila4MC

MCNP

SCALE

Serpent

Job description

Overview

We are seeking an Intermediate 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 3 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 3 years of relevant experience with Bachelor's degree.
• Experience in nuclear industry preferred.

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

At AtkinsRéalis, our values—Safety, Integrity, Collaboration, Innovation, and Excellence—are more than just words. They are the foundation of who we are and how we work. These principles shape our culture, guide our decisions, and inspire us to create an environment where every team member feels empowered to grow, succeed, and make a meaningful impact.

Depending on your employment status, AtkinsRéalis benefits may include 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, and voluntary benefits. You can review our comprehensive benefits page here.

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.

Find out more.

Expected compensation range is between $74,000 - $138,700 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.

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Unless expressly authorized by AtkinsRéalis, candidates may not use generative artificial intelligence tools, real‑time interview coaching applications, or AI‑generated responses created during the interview. Candidates are expected to accurately represent their qualifications, experience, knowledge, and abilities throughout the recruitment process. The use of unauthorized assistance, misrepresentation of credentials or experience, or any conduct that compromises the integrity of the selection process may result in disqualification from further consideration or withdrawal of an employment offer, at the discretion of AtkinsRéalis.

AtkinsRéalis is committed to providing reasonable accommodations to qualified individuals with disabilities. If you require an accommodation to participate in the application, interview, or selection process, please contact us at [e-mail]. Requests for accommodation will be considered in accordance with applicable law.

Note To Staffing And Direct Hire Agencies

In the event a recruiter or agency who is not on our preferred supplier list submits a resume/candidate to anyone in the company, AtkinsRéalis family of companies, we explicitly reserve the right to recruit and hire the candidate(s) at our discretion and without any financial obligation to the recruiter or agency. https://careers.atkinsrealis.com/recruitment-agencies