An Efficient Low-order Integral Transport Matrix Method for Optically Thick Problems Implemented in Griffin

Conference paper presented at PHYSOR 2026 - The International Conference on Physics of Reactors. Published in Proceedings of PHYSOR 2026 International Conference. ISBN: 979-12-81583-46-7. Conference website: https://www.physor2026.org/. Session: R10. Deterministic Transport Methods. Paper ID: 167. Copyright transferred to Politecnico di Torino by the authors for publication in the PHYSOR 2026 proceedings. This record is distributed as Open Access under the Creative Commons Attribution 4.0 International license (CC BY 4.0).