Three-Dimensional Pin-by-pin Transient Analysis for PWR-Core

Qin Junwei; Li Yunzhao; Wang Kunpeng; Wu Hongchun; Cao Liangzhi

doi:10.13832/j.jnpe.2023.06.0032

Volume 44 Issue 6

Dec. 2023

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Qin Junwei, Li Yunzhao, Wang Kunpeng, Wu Hongchun, Cao Liangzhi. Three-Dimensional Pin-by-pin Transient Analysis for PWR-Core[J]. Nuclear Power Engineering, 2023, 44(6): 32-38. doi: 10.13832/j.jnpe.2023.06.0032

Citation:

Qin Junwei, Li Yunzhao, Wang Kunpeng, Wu Hongchun, Cao Liangzhi. Three-Dimensional Pin-by-pin Transient Analysis for PWR-Core[J]. Nuclear Power Engineering, 2023, 44(6): 32-38. doi: 10.13832/j.jnpe.2023.06.0032

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Three-Dimensional Pin-by-pin Transient Analysis for PWR-Core

doi: 10.13832/j.jnpe.2023.06.0032

1.
Xi’an Jiaotong University, Xi’an, 710049, China
2.
Nuclear and Radiation Safety Center, Beijing, 100082, China

Received Date: 2022-12-13
Rev Recd Date: 2023-05-22

Available Online: 2023-12-11

Publish Date: 2023-12-15

Abstract

Abstract

In order to ensure the safety of nuclear reactor in transient process, it is necessary to carry out three-dimensional transient analysis of the whole core to obtain the power distribution of fuel rods concerned in the safety analysis. In this paper, a theoretical model of the pin-by-pin neutronic-thermohydraulic coupling transient analysis for PWR-core is established: the three-dimensional pin-by-pin spatio-temporal neutron dynamics calculation of PWR-core is realized by fully implicit backward difference method and exponential function expansion nodal method; the multi-channel model of cell scale is used to calculate the thermal feedback of three-dimensional full core pin-by-pin; the Picard iteration is used to realize the iterative calculation of neutronic-thermohydraulic tight coupling; using the parallel technology of message passing interface (MPI) and the unified spatial domain decomposition method, the parallel calculation of neutronic-thermohydraulic coupling transient process is realized. Based on the theoretical model, the corresponding code called Bamboo-Transient 2.0 was developed and verified by the benchmark and multi-assemblies questions, and it was then applied to the transient analysis for commercial PWRs. The results show that the pin-by-pin transient analysis code has more fine results than that of the traditional coarse-mesh diffusion code based on assembly homogenization, and it can reduce the deviation of power distribution of pin-cell. Meanwhile, it can provide the distribution of state parameters at cell scale, which can directly meet the requirements of safety analysis.
- PWR,
- NECP-Bamboo,
- Pin-by-pin,
- Transient analysis

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References(13)

References

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