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Numerical implementation of the MOOSE subchannel module (SCM) algorithm

Kyriakopoulos, Vasileios [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000244315480)·Tano Retamales, Mauricio Eduardo [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000334173869)
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Abstract

The subchannel module of moose (SCM), previously referred to as Pronghorn-SC, is a subchannel code designed to resolve single-phase flow fields and calculate the relevant flow variables, in nuclear reactor fuel-pin assemblies. The assemblies it models are: water-cooled, with bare fuel-pins in a square ducted, quadrilateral lattice and liquid-metal/water-cooled, with bare/wire-wrapped fuel pins in a hexagonal ducted, triangular lattice. Previous publications have presented the development, validation and verification of SCM. This work presents an comparative overview of the different solvers implemented within SCM. This includes the solver algorithm description, and a performance comparison. The two test cases chosen to demonstrate the solver performance were taken from the PSBT enthalpy mixing benchmark and the ORNL-19 pin benchmark.

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22 - GENERAL STUDIES OF NUCLEAR REACTORS42 - ENGINEERING97 - MATHEMATICS AND COMPUTINGMooseNewton MethodPETScSCMSubChannel

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Kyriakopoulos, Vasileios [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000244315480), Tano Retamales, Mauricio Eduardo [Idaho National Laboratory (INL), Idaho Falls, ID (United States)] (ORCID:0000000334173869). 2026-02-11. Numerical implementation of the MOOSE subchannel module (SCM) algorithm. https://doi.org/10.1016/j.nucengdes.2026.114802

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