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Amentum Logo Amentum · Energy

Criticality Safety Engineer

United States, Oak Ridge · Job Posted April 23, 2026
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Job Description

Amentum is seeking a Nuclear Criticality Safety Engineer based in our Oakridge, TN office. Candidates will obtain site specific Nuclear Criticality Safety (NCS) Analyst Qualification to support implementation of a DOE Approved Nuclear Criticality Safety Program in an operating non-reactor nuclear facility.

Job Responsibility

  • Provide technical guidance to operating organizations
  • Collaborate with operating organization personnel on NCS evaluations as the lead NCS Analyst
  • Perform independent reviews of NCS evaluations
  • Conduct periodic reviews of fissionable material operations
  • Lead and/or participating in NCS response to programmatic issues and criticality process deviations/infractions
  • Participate in NCS emergency response preparation (emergency procedures, plans, exercises, and drills)
  • Independently prepare, review, and/or present technical reports to the criticality safety community (e.g. American Nuclear Society, etc.)
  • Conduct NCS training for all levels of employees involved in fissionable material operations
  • Assist in the development and/or review of new or proposed changes to existing NCS programmatic policy and implementing documents
  • Lead and/or participate in assessments and audits of the NCS Program
  • Mentor of less experienced Nuclear Criticality Safety (NCS) Analysts and Analysts In-Training on all aspects of criticality safety
  • Development, revision, and review of Nuclear Criticality Safety (NCS) documentation such as Criticality Safety Evaluations (CSEs), Nuclear Criticality Safety Design Analysis, and Calculations (DACs) and various other NCS technical basis documentation
  • Complete required NCS annual Operational Reviews
  • Daily nuclear facility support
  • consisting of facility walkdowns, review of NCS requirements, implementing documents, participation at facility Operational Safety Boards, etc.

Requirements

  • Bachelor's degree in nuclear, engineering, math, or science with minimum of 1-2 years of Nuclear Criticality Safety (NCS) experience is required (Nuclear Engineering degree preferred) or 7 years of equivalent technical experience in place of a B.S.
  • Experience in Approach to Critical (e.g., NCSP Hands-On Criticality Safety Course) preferred
  • DOE-specific experience is highly preferred
  • Candidate must be a US citizen
  • Candidate must have the ability to obtain and maintain a DOE "Q" security clearance
  • Demonstrated keen attention to detail

Nice to have

  • Experience in Approach to Critical (e.g., NCSP Hands-On Criticality Safety Course) preferred
  • DOE-specific experience is highly preferred

What we offer

  • Health, dental, and vision insurance
  • Paid time off and holidays
  • Retirement benefits (including 401(k) matching)
  • Educational reimbursement
  • Parental leave
  • Employee stock purchase plan
  • Tax-saving options
  • Disability and life insurance
  • Pet insurance
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