Nuclear Shielding and Criticality Engineer Job at System One, Washington DC

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  • System One
  • Washington DC

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

Job Tags

Contract work, Remote job,

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