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Sr. Nuclear Criticality Safety Engineer

  • Job reference: AE-000338
  • Sector: Energy, Government, Nuclear
  • Location: Oak Ridge
This vacancy has now expired

Why not...

SNC-Lavalin’s Atkins business is one of the world’s most respected design, engineering and project management consultancies. SNC-Lavalin’s Atkins business has been providing infrastructure planning, engineering, construction, environmental consulting, urban planning, architecture, and program management services to public and private clients across the United States for more than 50 years.

SNC-Lavalin’s Atkins business was ranked as the world’s 11th largest global design firm by ENR in 2016 with nearly 18,000 employees worldwide. We have the depth and breadth of expertise to respond to the most technically challenging and time-critical infrastructure projects and the urgent transition to a low-carbon economy.

Atkins Nuclear Solutions US is currently seeking a Sr. Nuclear Criticality Safety Engineer to join the nuclear team in Oak Ridge, TN. 


Develops and implements the Nuclear Criticality Safety (NCS) Program.

Assists in identification of the need for and/or development of NCS compliance training to support Isotek activities.

Maintains awareness of NCS-related operations within Project.

Participates in critiques/investigations involving NCS issues, as requested.

Provides field support of operations in the area of nuclear criticality safety, including periodic surveillance and assessment of conformance to Nuclear Criticality Safety Approval (NCSA) requirements.

Supports building activities, such as construction and maintenance, to ensure criticality safety.

Reviews Work Packages, procedures, and other Project documents to ensure compliance with NCS requirements.

Performs Criticality Accident Alarm System (CAAS) assessments.

Performs audits, surveillances, and assessments of the NCS Program.

Functions as primary interpretative authority on matters related to NCS Program, including applicable WSS.

Maintains knowledge of NCS-related standards, guides, and codes.

Prepares and peer reviews NCS documents Fissile Material Operations (FMO) Screens, Nuclear Criticality Safety Evaluations (NCSEs), NCSAs, and NCS Reports (NCSRs).

Maintains familiarity with assigned FMOs.

Documents justification for not having CAAS coverage (if appropriate) for FMO in the appropriate NCSE.

Reviews and approves designs, plans, procedures, instructions and administrative aids that implement NCS requirements or potentially impact NCS.

Performs NCSE/A implementation walk downs and provides input to site emergency plans as requested.

Provides delivery of NCS training and the evaluation of its effectiveness.

Reviews applicable facility Safety Basis documents for NCS issues.


Baccalaureate in engineering or related science.

Minimum 10 years’ nuclear experience.

Applicants selected will be subject to a Federal background investigation and must meet eligibility requirements for access to classified information or matter.


Proficient knowledge of Microsoft Office.

Strong communication, verbal and written skills.

Broad experience in the development and implementation of NCS Programs.

Ability to perform calculations with Monte Carlo neutron transport codes.

Ability to perform hand calculations for criticality.

Due to current law, and in conjunction with the advertised position’s scope of work, candidates that are Non-US citizens are required to be submitted for further approval to the NNSA before being considered for hiring purposes. In addition, any candidates with dual citizenship in the US and another country must undergo further review for approval by the NNSA. Proof of citizenship will be requested upon receipt of application/resume.

Atkins offers its employees a robust rewards package which includes: a competitive salary; a broad benefits package including medical/RX, dental, vision, life, disability, legal, hospitalization and other valuable voluntary options; generous time-off programs; flexible work schedules; 401(k) with employer match; professional and career development opportunities through our corporate university, as well as a highly-regarded tuition reimbursement program; and an unmatched culture focused on client-service, quality, and tireless pursuit of excellence in all we do. Atkins is an equal opportunity, drug-free employer committed to diversity in the workplace. EOE/Minorities/Females/Vet/Disability.

Please view Atkins Equal Opportunity Statement here: 


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