Senior Reactor Physics & Shielding Engineer – Remote

Ecotal; California (MO); Hybrid; USD 180,000 - 240,000; Full time

Job summary

Ecotal is seeking a Lead Reactor Physics & Shielding Engineer to own reactor physics, criticality, shielding and source-term analysis across the programme. You will establish calculation methodologies, perform and review critical analyses, support licensing documentation, and help build technical capability as the programme grows.

The role connects core design, depletion, criticality, radiation transport and dose analysis into a defensible methodology, guiding safety analyses and regulatory

Qualifications

• MS or PhD in Nuclear Engineering, Reactor Physics, Health Physics or a closely related discipline.
• Significant hands-on reactor-physics, criticality or radiation-transport experience.
• Experience with lattice-physics, burnup or depletion calculations.
• Demonstrated shielding and dose-analysis capability, including deep-penetration problems and variance reduction.
• Experience with nuclide-inventory, activation or decay tools such as ORIGEN.

Responsibilities

• Own reactor-physics and shielding analysis across the reactor programme.
• Support core geometry, lattice design, enrichment selection, reactivity control and shutdown-margin development.
• Perform criticality, kinetics, reactivity-coefficient, depletion and cycle-length calculations.
• Develop criticality-safety cases covering fresh fuel, in-core fuel, spent fuel and storage configurations.
• Establish and maintain qualified calculation models, base decks and analysis workflows.
• Develop core, coolant, activation and decommissioning source terms.
• Design primary and secondary shielding and produce occupational and facility dose maps.
• Analyse deep-penetration radiation streaming through complex penetrations using variance-reduction techniques.
• Cross-verify computational methods and support benchmarking, uncertainty analysis and validation.
• Provide neutronics, shielding and source-term inputs to safety analyses and licensing documentation.
• Support reactor-safety-report chapters and design-basis accident dose calculations.
• Work closely with thermal-hydraulics, mechanical, fuel, safety, licensing and operations teams.
• Provide technical leadership, review engineering calculations and mentor developing engineers.

Skills

Nuclear engineering

Reactor physics

Radiation transport

Criticality safety

Safety analysis

Education

MS or PhD in Nuclear Engineering or related discipline

Tools

MCNP

SCALE

Serpent

OpenMC

CASMO/SIMULATE

ORIGEN

Job description

Ecotal is seeking a Lead Reactor Physics & Shielding Engineer to own reactor physics, criticality, shielding and source-term analysis across the programme. You will establish calculation methodologies, perform and review critical analyses, support licensing documentation, and help build technical capability as the programme grows.

The role connects core design, depletion, criticality, radiation transport and dose analysis into a defensible methodology, guiding safety analyses and regulatory