Lead Reactor Physics & Shielding Engineer

• MS or PhD in Nuclear Engineering, Reactor Physics, Health Physics, or radiation transport.
• Hands-on production depth in a continuous-energy Monte-Carlo transport and criticality code such as CASMO/SIMULATE, SCALE, MCNP, Serpent, or OpenMC.
• Demonstrated radiation-transport shielding experience utilizing variance reduction tools like MAVRIC/Monaco, MCNP, or OpenMC.
• Experience with a lattice-physics or depletion code such as CASMO, SCALE, or Serpent.
• Proficiency with a nuclide-inventory and decay tool such as ORIGEN or an equivalent software.
• Deep understanding of NUREG-0800 Standard Review Plan (SRP) sections 4.2, 4.3, 9.1.1, 11.1, and 12.2–12.5.

• Experience with marine compact PWR core physics, specifically drum-controlled or near-boron-free cores.
• Ability to cross-verify codes and derive Upper Subcritical Limits (USL) via ICSBEP benchmarking per NUREG/CR-6698.
• Familiarity with RG 1.183 (Alternative Source Term) and GDC 19 to ensure control-room Total Effective Dose Equivalent (TEDE) limits are met.
• Experience utilizing ENDF/B (VII.1 / VIII.0) data libraries in criticality and transport evaluations.

On-Site Requirement: Our team works together at our Long Beach facility, right next to our barge.

Highly Cross-Functional: Startups move fast!

You must possess the ability to seamlessly collaborate across multiple teams to rapidly solve problems and keep production moving.

Physical & Machinery Requirements: Because we are a hands-on startup, this role may require the ability to perform physical labor, navigate active construction/manufacturing zones, and/or operate heavy machinery and specialized manufacturing equipment as needed.