High-fidelity Full Core Neutronics Calculation Method for Fuel Assembly Bowing and Its Application

Li Fan; Liu Zhouyu; Wang Xining; Cao Liangzhi; Wu Hongchun

doi:10.13832/j.jnpe.2023.04.0009

Volume 44 Issue 4

Aug. 2023

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Li Fan, Liu Zhouyu, Wang Xining, Cao Liangzhi, Wu Hongchun. High-fidelity Full Core Neutronics Calculation Method for Fuel Assembly Bowing and Its Application[J]. Nuclear Power Engineering, 2023, 44(4): 9-16. doi: 10.13832/j.jnpe.2023.04.0009

Citation:

Li Fan, Liu Zhouyu, Wang Xining, Cao Liangzhi, Wu Hongchun. High-fidelity Full Core Neutronics Calculation Method for Fuel Assembly Bowing and Its Application[J]. Nuclear Power Engineering, 2023, 44(4): 9-16. doi: 10.13832/j.jnpe.2023.04.0009

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High-fidelity Full Core Neutronics Calculation Method for Fuel Assembly Bowing and Its Application

doi: 10.13832/j.jnpe.2023.04.0009

Department of Nuclear Science and Technology, Xi'an Jiaotong University, Xi’an , 710049, China

Received Date: 2022-08-04
Rev Recd Date: 2022-10-31
Publish Date: 2023-08-15

Abstract

Abstract

In order to study the influence of bowing deformation of fuel assemblies on core power distribution, this paper proposes an equivalent method for simulating the bowing of fuel assemblies in PWR Core. That is, according to the principle of conservation of atomic number of the water gap material around the fuel assembly before and after bowing, the nuclear density of all nuclides in the water gap after bowing is changed by keeping the width of the water gap unchanged before and after bowing, which approximates the change of the water gap around the equivalent fuel assembly after bowing. Its correctness is verified by Monte-Carlo code NECP-MCX and deterministic numerical code NECP-X. Based on the deterministic numerical code NECP-X, the fuel assembly bowing condition of the EPR core is simulated and analyzed. The calculation results show that due to the change of local moderating effect, the small bending of fuel assembly has a relatively great influence on the core power distribution. When the maximum offset in the whole core problem is about 2mm, the relative change of the assembly power can reach about 5%.
- Fuel assembly bowing,
- Power distribution,
- Monte-Carlo code,
- Deterministic code,
- EPR

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References(9)

References

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