Nuclear Shielding and Criticality Engineer
Company: System One
Location: Bellevue
Posted on: June 24, 2025
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Job Description:
Job Title: Nuclear Shielding and Criticality Engineer (Remote)
Location: Remote (U.S.-based) Employment Type: Contract Company:
System One System One is actively seeking a highly skilled and
motivated Nuclear Shielding and Criticality Engineer for a remote
contract position supporting advanced nuclear technology projects.
This is an excellent opportunity for experienced engineers who
thrive in autonomous, high-impact technical environments. About the
Role: As a Nuclear Shielding and Criticality Engineer, you will be
responsible for radiation transport and criticality safety analysis
using MCNP 6.2. The scope includes shielding calculations, energy
deposition, neutron fluence, activation studies, and development of
upper subcritical limits. You will support safety, licensing, and
design efforts in accordance with high-quality nuclear standards,
including NQA-1. Responsibilities: Perform shielding and radiation
transport analysis for advanced nuclear systems. Calculate dose
rates, activation rates, neutron fluence, and energy deposition.
Conduct material activation analyses to develop radiation sources.
Perform nuclear criticality safety evaluations and define Upper
Subcritical Limits (USLs). Maintain clear, traceable, and auditable
documentation aligned with QA requirements. Collaborate remotely
with multidisciplinary teams and contribute to evolving technical
needs. Required Qualifications: B.S. in Nuclear Engineering with
5–20 years of experience, or M.S. with 3–15 years, or Ph.D. with
2–10 years of experience. Expert-level MCNP user with demonstrated
radiation shielding analysis experience. Proficient with MCNP
variance reduction techniques (mesh tallies, weight windows,
surface sources). Strong communication and documentation skills.
Experience working within NQA-1 or equivalent QA frameworks.
Preferred Qualifications: Familiarity with ADVANTG for weight
window generation. Experience with criticality safety methods and
regulations. Exposure to fast reactor physics and design is a plus.
Familiarity with Attila/Attila4MC, CAD tools (e.g., SolidWorks,
SpaceClaim/ANSYS, Cubit). Programming experience in Python or other
scientific languages. Ability to quickly learn and apply nuclear
design concepts in support of project goals. Ref: 161-Managed
Staffing Charlotte
Keywords: System One, Seattle , Nuclear Shielding and Criticality Engineer, Engineering , Bellevue, Washington
