Prometheus NEP + EM-Augmented Ion Propulsion A Buildable Nuclear-Electric Architecture for Deep-Space Mobility Version 1.0 – February 2026 This work presents a fully buildable nuclear-electric propulsion (NEP) architecture that combines a Prometheus-class fission reactor (200–400 kWe) with a four-engine NEXT-class ion propulsion cluster and a novel dual electromagnetic rotating nozzle assembly. The system extends the established NEP lineage by introducing a governed downstream electromagnetic collimation stage that improves exhaust directionality, increases effective exhaust velocity, and delivers 10–20% enhancement in thrust-per-kilowatt — all without invoking new physics or unproven materials. Key performance parameters (representative 300 kWe design point): Effective thrust: 5.5–9.6 N Effective specific impulse: 4.5–5.4 ks Propulsion power allocation: 220–250 kW Continuous high-Isp thrust suitable for long-duration, low-acceleration transfers All primary subsystems — reactor, power conversion, ion engines, and EM field structures — are grounded in flight-heritage technologies (Prometheus / Kilopower lineage, NSTAR → NEXT → NEXT-C evolution) or mature engineering practice. The modular layout supports multiple control modes, graceful degradation, precise vectoring (via differential engine operation and EM nozzle field modulation), and integration with the broader Griffiths Canon: Clean docking and thrust alignment with the Dual Ring Habitat (DRH) inertial spine Field-layer harmonization with GRFF (Griffiths Reactive Field Framework) Power and governance support for MPE (Managed Plasma Environments) Distributed propulsion coordination via DIGSP Comparative analysis shows clear advantages over microwave-thermal propulsion for long-arc missions and over speculative force-law concepts in terms of reproducibility, falsifiability, and near-term realizability. The architecture enables Pluto-class round-trip missions, interplanetary logistics, habitat repositioning, and interstellar precursor trajectories while maintaining engineering discipline, quantifiable performance, and reviewer-ready transparency. “Qualitas non gradus requirit, sed censuram et iterationem” This document is part of the Griffiths Canon. © Wayne Griffiths. All rights reserved. Redistribution, modification, or incorporation into derivative works is prohibited without written permission.