Research on Multi-Group Constant with Discrete Angle and SPH Method Based on RMC

Li Yaodong; Yu Ganglin; Wang Kan

doi:10.13832/j.jnpe.2025.S1.0269

Volume 46 Issue S1

Jul. 2025

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Li Yaodong, Yu Ganglin, Wang Kan. Research on Multi-Group Constant with Discrete Angle and SPH Method Based on RMC[J]. Nuclear Power Engineering, 2025, 46(S1): 269-275. doi: 10.13832/j.jnpe.2025.S1.0269

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Li Yaodong, Yu Ganglin, Wang Kan. Research on Multi-Group Constant with Discrete Angle and SPH Method Based on RMC[J]. Nuclear Power Engineering, 2025, 46(S1): 269-275. doi: 10.13832/j.jnpe.2025.S1.0269

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Research on Multi-Group Constant with Discrete Angle and SPH Method Based on RMC

doi: 10.13832/j.jnpe.2025.S1.0269

Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

Received Date: 2024-12-01
Rev Recd Date: 2025-04-05
Publish Date: 2025-06-15

Abstract

Abstract

In this paper, a Monte Carlo group constant calculation method with discrete scattering angle is proposed, and the group constants are calculated and verified by using rod-type fuel assembly. First, a multi-group constant library based on fuel assembly or pin is calculated using the Reactor Monte Carlo (RMC) code, and then the group constant library is used for the neutron transport calculation of the full core. In the generation process of multi-group constant library, the neutron collision behavior is tracked based on the neutron history, which can accurately express the anisotropic scattering of neutrons. Since the group constant library is generated under real full-core conditions, no approximations are theoretically introduced during the transport calculation. For equivalent homogenization, an improved Superhomogenization (SPH) method is adopted. The above research shows that compared with the traditional Legendre scattering matrix, the method proposed in this paper avoids the generation of negative cross section; Compared with the continuous energy Monte Carlo results, the assembly calculation error is less than 70pcm (pcm=10⁻⁵); It is more accurate to calculate the group constant under real full-core conditions, with flexible geometric adaptability and excellent universality.
- Reactor Monte Carlo (RMC),
- Multi-Group constant,
- Discrete angel,
- Superhomogenization (SPH)

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References(9)

References

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