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Nuclear Shielding and Criticality Engineer

System One
Bellevue, WA Contractor
POSTED ON 4/11/2026
AVAILABLE BEFORE 6/14/2026
Job Title: Nuclear Shielding and Criticality Engineer
Location: Bellevue, WA
Type: Contract
Compensation: $69.00 - $115.00
Contractor Work Model: Remote
Hours: 40.0

Overview

System One is seeking to contract with a highly capable and motivated nuclear shielding and criticality engineer. The primary software is MCNP 6.2, and strong MCNP skills are required. The successful candidate must be self-motivated and capable of working effectively in a remote environment. The class of problems include shielding, energy deposition, neutron fluence, activation, and criticality. Strong written and oral communication skills are essential. Experience working in an NQA-1 environment with rigorous quality standards is desirable.

Tasks
  • Tasks are generally MCNP calculations formally documented in calculation packages.

Experience
  • B.S. degree in Nuclear Engineering with 10 years’ experience
  • M.S. degree in Nuclear Engineering with 6 years’ experience
  • Ph.D. degree in Nuclear Engineering with 3 years’ experience

Key Qualifications and Skills
  • Strong MCNP skills and experience with performing radiation shielding calculations for both gammas and neutrons are required. Experience in criticality safety desirable.
  • Candidate should be familiar with variance reduction using MCNP, and features such as surface source read/write, mesh tallies, and weight windows. Familiarity with ADVANTG for weight windows generation is a plus.
  • Excellent written and verbal and communication skills required.
  • Ability and professionalism to work within published regulatory guidelines required.
  • Experience working under NQA-1 quality program desired.
  • Strong computational expertise desired.
  • Experience with Attila /Attila4MC and computed aided drafting (e.g., SolidWorks, SpaceClaim/ANSYS, Cubit) is a plus.
  • Fast reactor experience a plus.
  • Strong programming skills in any language is a plus, and Python is commonly used in this position.
  • Knowledgeable or highly motivated to quickly learn basic nuclear reactor design concepts to meaningfully support engineering team.
  • Actual position starting level will be determined based on assessment of qualifications.


Ref: #161-Managed Staffing Charlotte

Salary : $69 - $115

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