Nuclear Criticality Safety Engineer Energy

AtkinsRéalis; Oak Ridge (TN); On-site; USD 57,000 - 125,000; Full time

Benefits offered by this job

Medical

Dental

Vision

Life insurance

401(k) with 100% vesting

Job summary

At AtkinsRéalis, a leading engineering and nuclear services firm, seeks a Nuclear Criticality Safety Engineer to join the Oak Ridge team. You will implement the NCS program, review safety-related documents, and perform criticality calculations and analyses to support project activities.

The role requires a Nuclear Engineering or Physics background, strong communication skills, and the ability to work with Monte Carlo codes. U.S. citizenship and Real ID are required for access to the facility.

Qualifications

• Baccalaureate in Nuclear Engineering or Physics.
• One-year NCS-related nuclear experience preferred but not required.
• Applicants subject to Federal background check for access to classified information.
• Real ID compliant identification required to access the work location.
• Proficient knowledge of Microsoft Office.
• Strong communication skills, both written and verbal.
• Ability to explain DOE Orders/Standards in relation to NCS.
• Ability to perform calculations with Monte Carlo neutron transport codes.
• Ability to perform hand calculations for criticality.
• U.S. citizenship required for AtkinsRéalis/Isotek Systems Project positions.

Responsibilities

• Stops work if unsafe conditions threaten personnel safety or environmental risk.
• Supports implementation of the Nuclear Criticality Safety (NCS) Program.
• Ensures facility activities meet criticality safety requirements.
• Prepares and peer reviews NCS documents (FMO Screens, NCSEs, NCSAs, Clarifications, Reports, ACANAS).
• Performs NCSE/A implementation walkdowns and contributes to site emergency plans.
• Maintains awareness of NCS issues with FMOs and project.
• Participates in NCS critiques and investigations.
• Reviews Conditions Adverse to Quality for NCS impacts.
• Performs audits, surveillances, and assessments of NCS Programs.
• Reviews and approves NCS-related designs, procedures, and documents.
• Reviews safety basis documents for NCS integration.
• Participates in Hazard Evaluations and Hazards Analyses.
• Identifies need for NCS training and delivers it.
• Maintains knowledge of NCS standards, guides, and codes.

Skills

Criticality calculations

Verbal and written communication

NCS program knowledge

Education

Baccalaureate in Nuclear Engineering or Physics

Tools

Monte Carlo neutron transport codes

Microsoft Office

Job description

Job Description

Overview

We are seeking a Nuclear Criticality Safety Engineer Energy, to join our Team in our Oak Ridge, TN office.

Your role

• Stops work without fear of reprisal for unsafe conditions potentially affecting personnel safety or environmental risk.
• Supports implementation of the Nuclear Criticality Safety (NCS) Program.
• Supports facility activities to ensure criticality safety.
• Prepares and peer reviews NCS documents Fissile Material Operations (FMO) Screens, NCS Evaluations (NCSEs), NCS Approvals (NCSAs), NCS Clarifications, NCS Reports, and Criticality Accident Alarm System Needs Analyses.
• Performs NCSE/A implementation walkdowns and provides input to site emergency plans and pre-incident plans, as requested.
• Maintains awareness with assigned FMOs and NCS-related issues within Project.
• Participates in critiques/investigations involving NCS issues.
• Reviews Conditions Adverse to Quality (e.g., Non-Conformance Reports, Findings) for NCS impacts.
• Performs audits, surveillances, and assessments of the NCS Program and Project conformance to NCSA and NCS-related contract requirements.
• Reviews and approves work packages, procedures, administrative aids, and other Project documents to ensure compliance with NCS requirements.
• Reviews and approves designs and plans that potentially impact NCS.
• Reviews applicable facility Safety Basis documents for NCS integration.
• Participates in Hazard Evaluation Studies/Hazards Analysis in support of Project activities.
• Identifies the need for NCS training to support Project activities.
• Provides delivery of NCS training and the evaluation of its effectiveness.
• Maintains knowledge of NCS-related standards, guides, and codes.
• Supports the execution of Integrated Safety Management System guiding principles and core functions and the Isotek Safety Culture.
• Performs other duties as assigned.

About you

• Baccalaureate in Nuclear Engineering or Physics.
• One-year NCS-related nuclear experience preferred but not required.
• Applicants selected will be subject to a Federal background investigation and must meet eligibility requirements for access to classified information or matter.
• Applicants must have Real ID compliant identification to access the work location.
• Proficient knowledge of Microsoft Office.
• Strong communication, verbal and written skills.
• Ability to describe the essential requirements, relationships and importance of applicable DOE Orders/Standards with respect to NCS.
• Ability to perform calculations with Monte Carlo neutron transport codes.
• Ability to perform hand calculations for criticality.
• U.S. citizenship required for AtkinsRéalis/Isotek Systems Project positions.
• Must be a U.S. citizen in order to be considered.

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
• 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.

Additional information

Expected compensation range is between $57,000-$125,000 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.

AtkinsRéalis cares about your privacy and is committed to protecting your privacy. Please consult our Privacy Notice on our Careers site to know more about how we collect, use and transfer your Personal Data. By submitting your personal information to AtkinsRéalis, you confirm that you have read and accept our Privacy Notice.

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.

Worker Type

Employee

Job Type

Regular

AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world‑class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.