Study on Reactivity Change Caused by Dynamic Impact of Space Nuclear Reactor

Wang Lipeng; Cao Lu; Li Rui; Liu Shichang; Chen Lixin; Jiang Duoyu; Hu Tianliang

doi:10.13832/j.jnpe.2024.05.0071

Volume 45 Issue 5

Oct. 2024

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Wang Lipeng, Cao Lu, Li Rui, Liu Shichang, Chen Lixin, Jiang Duoyu, Hu Tianliang. Study on Reactivity Change Caused by Dynamic Impact of Space Nuclear Reactor[J]. Nuclear Power Engineering, 2024, 45(5): 71-77. doi: 10.13832/j.jnpe.2024.05.0071

Citation:

Wang Lipeng, Cao Lu, Li Rui, Liu Shichang, Chen Lixin, Jiang Duoyu, Hu Tianliang. Study on Reactivity Change Caused by Dynamic Impact of Space Nuclear Reactor[J]. Nuclear Power Engineering, 2024, 45(5): 71-77. doi: 10.13832/j.jnpe.2024.05.0071

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Study on Reactivity Change Caused by Dynamic Impact of Space Nuclear Reactor

doi: 10.13832/j.jnpe.2024.05.0071

1.
Northwest Institute of Nuclear Technology, Xi’an, 710024, China
2.
School of Nuclear Science and Engineering, North China Electric Power University, Beijing, 102206, China

Received Date: 2023-10-22
Rev Recd Date: 2023-11-30
Publish Date: 2024-10-14

Abstract

Abstract

Accurate calculation of reactivity changes caused by impact is a key problem to be solved urgently in the design and safety analysis of micro-reactors. In this paper, neutron transport simulation and explicit finite element dynamics simulation based on unstructured-mesh Monte Carlo are combined to study the multi-physical coupling calculation of micro-reactor under the condition of large deformation of dynamic impact. Taking the 85-pin NaK-cooled space nuclear reactor as an example, the time-dependent variation of reactivity in the process of vertical and 45° dip impact is analyzed. The results show that, without considering the uniform density change of fluid and fuel, the k_eff caused by vertical impact increases by about 8%, while the k_eff caused by 45° impact increases by about 3%, which were in good agreement with the results in the literature. Under the condition of non-uniform fuel density change, the increase of k_eff in the two scenarios increased by about 10% and 20%, respectively. The research provides an important theoretical foundation for the critical safety analysis of the space nuclear reactor’s launch.
- Micro-reactor,
- Dynamic shock,
- Large deformation,
- Critical characteristics,
- Multi-physical coupling

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References(14)

References

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