Nuclear Shielding and Criticality Engineer

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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

Type: Contract

Experience: 10

Education: BS

Category: Energy

Contractor Work Model: Remote

Brand: System One

Shift: On-Site

Compensation Range: 69.00 - 115.00 Per Hour

Job ID: 347861

Date Posted: 03/16/2026

Shortcut: https://jobs.systemone.com/QI3A92