Development and Validation of Assembly Calculation Module in 3D Neutron Transport Code for Molten Salt Reactors

Dai Ming; Cheng Maosong

doi:10.13832/j.jnpe.2025.S1.0192

Volume 46 Issue S1

Jul. 2025

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Dai Ming, Cheng Maosong. Development and Validation of Assembly Calculation Module in 3D Neutron Transport Code for Molten Salt Reactors[J]. Nuclear Power Engineering, 2025, 46(S1): 192-199. doi: 10.13832/j.jnpe.2025.S1.0192

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Dai Ming, Cheng Maosong. Development and Validation of Assembly Calculation Module in 3D Neutron Transport Code for Molten Salt Reactors[J]. Nuclear Power Engineering, 2025, 46(S1): 192-199. doi: 10.13832/j.jnpe.2025.S1.0192

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Development and Validation of Assembly Calculation Module in 3D Neutron Transport Code for Molten Salt Reactors

doi: 10.13832/j.jnpe.2025.S1.0192

Dai Ming^1
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Cheng Maosong^{1, 2
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1.
Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, 201800, China
2.
University of Chinese Academy of Sciences, Beijing, 101408, China

Received Date: 2025-04-06
Rev Recd Date: 2025-04-24
Publish Date: 2025-06-15

Abstract

Abstract

The three-dimensional (3D) neutron transport code ThorMOC for molten salt reactors (MSRs) utilizes the non-uniform spectra modification method to provide few-group cross sections for full-core transport calculations, which relies on the multi-group effective macroscopic cross sections from assembly or super-assembly calculations. For MSR assembly or super-assembly with 3D complex shape resonance regions, an Embedded Self-Shielding Method (ESSM) based on the SHEM361 multi-group data library had been developed within ThorMOC by leveraging its existing quasi-3D method of characteristics (MOC) solver, which is enhanced by GPU parallelization and the coarse-mesh MOC-based synthetic acceleration (MSA) technique, thereby enabling MSR assembly calculations in ThorMOC. For a cylindrical channel molten salt reactor, numerical analysis is conducted on seven types of assemblies, including three 3D super-assemblies with upper and lower support plates and cavities. Compared to results from the continuous-energy Monte Carlo method, the maximum k_eff relative deviation is −110pcm (1pcm=10⁻⁵). The numerical results demonstrate that the implemented assembly calculation module is effective for the calculations of MSR assemblies with 3D complex shape resonance regions.
- MSR,
- Assembly calculation,
- Embedded Self Shielding Method（ESSM）,
- Quasi-3D MOC（MOC）,
- MOC-based synthetic acceleration method（MSA）

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References(18)

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