@article{7d6391e6245145fe831f7128b2689a2b,
title = "Neutron transport methods for multiphysics heterogeneous reactor core simulation in Griffin",
abstract = "Griffin is a reactor physics application based on the Multiphysics Object-Oriented Simulation Environment (MOOSE). This work discloses the methods, algorithms, and implementation for simulating heterogeneous reactor dynamics models. Griffin utilizes a discontinuous finite-element method with discrete ordinates (DFEM-SN) to discretize the field variable of the multigroup neutron transport equation. Multiphysics feedback is handled using two-step tabulated cross-section methodology. Feedback quantities are evaluated using the MOOSE-MultiApp system to couple various engineering phenomena, such as heat conduction and thermal fluids. The multiphysics DFEM-SN system is solved using fixed-point iteration with a fully asynchronous parallel sweeper, unstructured coarse-mesh finite difference acceleration, and a multi-timescale improved quasi-static method scheme. The implementation is applied to a multiphysics microreactor model, with two transients: one initiated by a single heat-pipe failure and another by control drum rotation. These examples demonstrate the ability of Griffin to tractably solve the neutron transport equation considering seven independent variables and feedback.",
keywords = "Griffin, MOOSE, Multiphysics, Radiation transport, Reactor dynamics",
author = "Prince, \{Zachary M.\} and Hanophy, \{Joshua T.\} and Labour{\'e}, \{Vincent M.\} and Yaqi Wang and Harbour, \{Logan H.\} and Namjae Choi",
note = "Funding Information: This work is supported by DOE , under DOE Idaho Operations Office Contract DE-AC07-05ID14517. Accordingly, the U.S. government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. government purposes. This research made use of the resources of the High Performance Computing Center at INL, which is supported by the DOE Office of Nuclear Energy and by the Nuclear Science User Facilities. Funding Information: We would like to acknowledge our colleagues at INL and ANL, including Dr. Javier Ortensi, Dr. Sebastian Schunert, Dr. Changho Lee, Dr. Yeon Sang Lee, Dr. Hansol Park, Dr. Shikar Kumar, and Dr. Yan Cao—their feedback from testing and utilizing Griffin was instrumental in the development of this work. We would also like to acknowledge MOOSE developers, including Dr. Derek Gaston, Dr. Fande Kong and Dr. Alexsander Lindsay—their advice and specific developments in the framework were invaluable in making the DFEM-SN solver and multiphysics coupling possible. This work is supported by DOE, under DOE Idaho Operations Office Contract DE-AC07-05ID14517. Accordingly, the U.S. government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. government purposes. This research made use of the resources of the High Performance Computing Center at INL, which is supported by the DOE Office of Nuclear Energy and by the Nuclear Science User Facilities. Funding Information: The purpose of this paper is to introduce the methods used in the Griffin reactor physics software for high-fidelity reactor dynamics simulations. Griffin is a MOOSE-based application meant to streamline reactor analysis tasks by providing neutron transport, depletion, core performance, decay heat, and cross-section calculation capabilities for non-light-water reactor advanced reactor technologies. Griffin includes the heat conduction, Navier–Stokes, thermal hydraulics, and tensor mechanics modules in MOOSE for multiphysics coupling. Because Griffin is built with MOOSE, it can be readily combined with other MOOSE-based physics applications like BISON ( Williamson et al., 2021 ), Pronghorn ( Novak et al., 2021 ), Sockeye ( Hansel et al., 2021 ), and SAM ( Hu, 2017 ). Griffin is under active development by researchers at Idaho National Laboratory (INL) and Argonne National Laboratory (ANL) and is currently supported by the Department of Energy Nuclear Energy Advanced Modeling and Simulation program. Griffin was originally created by combining the INL-developed MAMMOTH ( Gleicher et al., 2014 ) and Rattlesnake ( Wang et al., 2021b ) applications and some capabilities and technology developed at ANL from the MC-3 tool-set ( Lee and Yang, 2017 ) and PROTEUS ( Jung and Lee, 2018 ). Publisher Copyright: {\textcopyright} 2024",
year = "2024",
month = jun,
day = "1",
doi = "10.1016/j.anucene.2024.110365",
language = "English",
volume = "200",
journal = "Annals of Nuclear Energy",
issn = "0306-4549",
publisher = "Elsevier Ltd",
}