Criticality Safety Engineer

About the role

Amentum is a global leader in advanced engineering and innovative solutions, supporting critical missions across defense, intelligence, energy, and civilian sectors. We are currently seeking a Criticality Safety Engineer to support our Oak Ridge, TN office. The Engineer will provide engineering support for U.S. Department of Energy (DOE) facilities and projects in Design Services, preparing documents to support the development of or changes to complex engineering designs or design changes supporting facility or project scoped work. 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.

Responsibilities

• 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 participate 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)
• 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 less experienced Nuclear Criticality Safety (NCS) Analysts and Analysts In-Training on all aspects of criticality safety
• Develop, revise, and review 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
• Provide daily nuclear facility support consisting of facility walkdowns, review of NCS requirements, implementing documents, and participation at facility Operational Safety Boards

Requirements

• Bachelor's degree in nuclear engineering, engineering, math, or science with minimum of 1–2 years of Nuclear Criticality Safety (NCS) experience (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 highly preferred
• Demonstrated keen attention to detail
• Ability to obtain and maintain a DOE "Q" security clearance
• Ability to obtain and maintain facility credentials/authorization (U.S. Citizenship required for facility credentials/authorization at this work location)

Alternate combinations of education and experience will be considered.

Pay

$115,000+ (good-faith estimate; actual compensation may vary based on job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws).

Benefits

• 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

Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original posting: 10/22/2026 — open until filled; requisition expected to remain open for at least three days.