Anisotropic SP<sub>3</sub> Two-Step Method for Reactor Cores with Strong Absorbers

Li Yunzhao; Qin Junwei; Xia Fan; Wu Hongchun; Cao Liangzhi

doi:10.13832/j.jnpe.2023.06.0009

Volume 44 Issue 6

Dec. 2023

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Li Yunzhao, Qin Junwei, Xia Fan, Wu Hongchun, Cao Liangzhi. Anisotropic SP3 Two-Step Method for Reactor Cores with Strong Absorbers[J]. Nuclear Power Engineering, 2023, 44(6): 9-15. doi: 10.13832/j.jnpe.2023.06.0009

Citation:

Li Yunzhao, Qin Junwei, Xia Fan, Wu Hongchun, Cao Liangzhi. Anisotropic SP₃ Two-Step Method for Reactor Cores with Strong Absorbers[J]. Nuclear Power Engineering, 2023, 44(6): 9-15. doi: 10.13832/j.jnpe.2023.06.0009

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Anisotropic SP₃ Two-Step Method for Reactor Cores with Strong Absorbers

doi: 10.13832/j.jnpe.2023.06.0009

1.
School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, 710049, China
2.
Shanghai Nuclear Engineering Research & Design Institute Co., Ltd., Shanghai, 200233, China

Received Date: 2022-12-15
Rev Recd Date: 2023-02-01

Available Online: 2023-12-11

Publish Date: 2023-12-15

Abstract

Abstract

The strong absorber in the core of nuclear reactor, especially the movable control rod, will significantly enhance the angular anisotropy effect of neutron angular fluence in the core. The traditional isotropic SP₃ two-step method cannot capture the feature effectively, therefore, the anisotropic SP₃ two-step method needs to be constructed. Firstly, this paper studies the anisotropic effect from two aspects; the anisotropic SP₃ equation is derived, and a homogenization model suitable for anisotropic SP₃ equation is established. The methodology proposed in this paper was validated and analyzed through the Material Test Reactor (MTR). The results show that the anisotropy SP₃ equation and its homogenization method in this paper have smaller deviation than the traditional calculation method, and the effective multiplication factor (k_eff) and power distribution are obviously improved. Therefore, the anisotropic SP₃ two-step method in this paper can effectively deal with the core problem with strong absorbers.
- Strong absorber,
- Fine-mesh homogenization,
- Anisotropic SP₃,
- Material Test Reactor

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References(22)

References

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