Nuclear Shielding and Criticality Engineer
Bellevue, WA
Experience: 15
Category: Energy
Contractor Work Model: Remote
Brand: System One
Compensation Range: 73.00 - 121.00 Per Hour
Job ID: 379706
Date Posted: 10/28/2026
Shortcut: http://jobs.systemone.com/UucvP6
Job Title: Nuclear Shielding and Criticality Engineer
Location: Bellevue, WA
Type: Contract (yearlong) typically extends on a yearly basis
Compensation: $73.00 - $121.00
Work Model: Remote – offsite
Hours: 40.0
Paid Holidays | PTO
Overview
System One is hiring a nuclear shielding and criticality engineer. The position is primarily shielding related. The primary software is MCNP 6.2, and strong MCNP skills are required. The class of problems includes 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.
Responsibilities
- Perform radiation shielding design and analysis for advanced nuclear reactors, including calculating dose rates, activation rates, neutron fluence rates, and energy deposition rates.
- Develop radiation sources based on material activation analysis for non-fuel in-vessel components.
- Perform criticality calculations and develop upper subcritical limits (USLs).
- Establish and maintain formal documentation of analysis results.
Requirements
- BS degree in Nuclear Engineering with minimum 15 years of experience
- MS degree in Nuclear Engineering with minimum 8 years of experience
- PhD degree in Nuclear Engineering with minimum 5 years of experience
- Strong MCNP skills and experience with performing radiation shielding calculations for both gammas and neutrons
- Familiarity with variance reduction using MCNP, and features such as surface source read/write, mesh tallies, and weight windows
- Experience working in an NQA-1 environment with rigorous quality standards is desirable
- Excellent written and verbal communication skills
- Ability and professionalism to work within published regulatory guidelines
- Experience with Attila /Attila4MC and computed aided drafting (e.g., SolidWorks, SpaceClaim) is a plus
- Strong programming skills in any language, especially Python, is a plus
- Knowledgeable or highly motivated to learn nuclear reactor design concepts quickly
- Acts independently and provides technical guidance; mentors less experienced engineers
System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.
System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.
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