Senior Nuclear Engineer, Neutronics

What You Will Be Doing:

We are seeking an experienced Senior Nuclear Engineer to support Helion’s efforts in nuclear engineering needs. This includes supporting the fusion neutronics, shielding, activation analysis, and diagnostics support. You will prepare reports and coordinate with cross-functional teams to integrate neutron diagnostics, support radiation safety, and ensure compliance with regulatory requirements. This is an onsite role at our Everett locations, and you will be reporting directly to the Nuclear Engineering Manager.

You Will:

• Conduct comprehensive radiation transport, shielding, and activation simulations for Helion fusion devices
• Create the workflow to estimate dose, decay heat during operation, and shutdown conditions for Helion fusion generators
• Utilize variance reduction and other methods to reduce computation run time
• Collaborate with Helion Science and Engineering teams throughout the design, development, and deployment phases of Helion fusion devices
• Communicate technical results and findings with accuracy and rigor to diverse audiences by preparing reports, presentations, and GUIs

Required Skills:

• 5+ years of experience in nuclear engineering, with a focus of neutronics, shielding, and activation analysis of nuclear systems
• Nuclear Physics Expertise with strong knowledge of neutron and photon interactions, cross sections, attenuation, decay, and radiation types
• Monte Carlo Radiation Transport codes hands-on experience (e.g., Attila, MCNP, OpenMC, Geant4, FLUKA)
• Experience with activation analysis (e.g., FISPACT, CINDER) and CAD to MC conversion (e.g., DAGMC, GEOUNED)
• Proficient in Python, MATLAB, or C++ for data analysis and HPC cluster job submissions
• Proven ability to validate simulations against experimental data

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