Senior Nuclear Engineer – Energy

AtkinsRéalis

. Lead and support execution, oversight, and coordination of nuclear engineering activities .

Posted 10/13/2026full-timeOak Ridge • Tennessee • United StatesSenior💰 $90,000 - $150,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in Nuclear Engineering with a focus on Small Modular Reactor designs, criticality safety evaluations, and radiation shielding. Proficient in regulatory compliance and safety analysis, ensuring adherence to NRC regulations and ANSI/ANS-8 standards.

Highest-signal resume keywords

Nuclear EngineeringSmall Modular Reactor DesignNuclear Criticality Safety EvaluationsMCNP and SCALE/KENO ProficiencyNRC Regulations Knowledge

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Nuclear Safety AnalysisRadiation Shielding DesignHazard AnalysisConfiguration ManagementNeutronics MethodologiesMonte Carlo CodesCore Physics CalculationsCode Verification and ValidationSafety Basis Document AuthoringTechnical Work Approval

Soft Skills

LeadershipCollaborationCommunication

Certifications & Qualifications

Professional Engineer (PE) License

Industry Keywords

Nuclear IndustryANSI/ANS-8 StandardsDOE Regulations10 CFR Parts 50, 70, and 71Advanced Fuel SystemsHALEUTRISO Fuel CyclesNuclear Quality Assurance ProgramIntegrated Engineering TeamsRegulatory Submittals

About the role

Key responsibilities & impact

Lead and support execution, oversight, and coordination of nuclear engineering activities
Ensure technical deliverables, design interfaces, and nuclear safety information flow across engineering disciplines, project functions, and external vendor interfaces
Apply deep expertise in Small Modular Reactor designs within a multidisciplinary team
Lead and coordinate technical work supporting US nuclear safety licensing activities
Author, review, and approve nuclear safety analyses, evaluation reports, and safety-basis documents
Participate in hazard analyses, process design reviews, and configuration management activities
Lead, execute, and approve Nuclear Criticality Safety Evaluations and Analyses for fuel fabrication, handling, storage, and transportation
Establish and validate criticality safety limits and engineered or administrative controls for SMR systems
Develop and maintain the Criticality Safety Program in alignment with ANSI/ANS-8 standards and NRC/DOE regulations
Apply validated neutronics methodologies and Monte Carlo codes to assess criticality margins, bias, and uncertainty
Lead, perform, and approve radiation shielding designs and radiation-transport analyses
Analyze and interpret radiation data to ensure operational safety, shielding effectiveness, and regulatory compliance
Perform other duties as assigned

Requirements

What you’ll need

Bachelor’s degree in Nuclear Engineering or a closely related discipline required
Master’s or Ph.D. preferred
7 years of relevant experience with a Bachelor’s degree
Candidates with a Master’s degree, Ph.D., or Professional Engineer (PE) license may qualify with 5 years’ experience
Experience in the nuclear industry preferred
Direct experience modeling or licensing Small Modular Reactors (SMRs) or advanced fuel systems such as HALEU or TRISO fuel cycles
Experience managing code verification, validation, and benchmarking under ASME NQA-1 or equivalent nuclear quality assurance program
Experience authoring and approving Nuclear Criticality Safety Evaluations (NCSEs) and Analyses (NCSAs)
Ability to design radiation shielding and perform complex radiation-transport and core physics calculations
Advanced hands-on proficiency with MCNP and SCALE/KENO, or equivalent codes such as Attila4MC or Serpent
Knowledge of NRC regulations, including 10 CFR Parts 50, 70, and 71, ANSI/ANS-8 standards, DOE Orders, Guides, Technical Standards, and nuclear facility safety-basis directives
At least 7 years of engineering experience reviewing, verifying, and formally approving other engineers’ technical work
Experience working in integrated, cross-functional engineering teams
Documented experience authoring formal safety basis documents, calculation packages, or regulatory submittals

Benefits

Comp & perks

Medical, dental, and vision benefits
Company-paid life insurance
Company-paid short- and long-term disability benefits
Employer-matched 401(k) with 100% vesting
Employee stock purchase plan
Paid Time Off
Leaves of absence options
Flexible work options
Recognition and employee satisfaction programs
Employee assistance program
Voluntary benefits