Simplified Modelling Method for Spacer Grid of NHR200-II Fuel Assembly

Wang Xicheng; Wang Dingqu; Jiang Yueyuan; Li Songyang

doi:10.13832/j.jnpe.2021.04.0105

Volume 42 Issue 4

Aug. 2021

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Wang Xicheng, Wang Dingqu, Jiang Yueyuan, Li Songyang. Simplified Modelling Method for Spacer Grid of NHR200-II Fuel Assembly[J]. Nuclear Power Engineering, 2021, 42(4): 105-111. doi: 10.13832/j.jnpe.2021.04.0105

Citation:

Wang Xicheng, Wang Dingqu, Jiang Yueyuan, Li Songyang. Simplified Modelling Method for Spacer Grid of NHR200-II Fuel Assembly[J]. Nuclear Power Engineering, 2021, 42(4): 105-111. doi: 10.13832/j.jnpe.2021.04.0105

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Simplified Modelling Method for Spacer Grid of NHR200-II Fuel Assembly

doi: 10.13832/j.jnpe.2021.04.0105

Wang Xicheng^1
,,
Wang Dingqu^{1, 2
,
,},
Jiang Yueyuan^{1, 2},
Li Songyang^{1, 2}

1.
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
2.
Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education of China,Tsinghua University, Beijing, 100084, China

Received Date: 2020-05-26
Rev Recd Date: 2021-01-22
Publish Date: 2021-08-15

Abstract

Abstract

A simplified modelling method for the spacer grid of NHR200-II fuel assembly is proposed to increase the computational efficiency in the dynamic analysis. It includes the replacement of the grid inside the dimples and three-arc springs with the non-linear connectors, and the replacement of the fuel rods with beam elements. The stiffness of connectors was derived from previous experiments of NHR200-II spacer grid. Natural frequency analysis and impact simulation were performed by a 1×2 sub-model of the fuel assembly to verify this method. Then, this simplified method was applied to a full-scale 9×9 spacer grid model, to study the effects of the grid clamping ability on its dynamic characteristics. The results suggest that this simplified approach can give a reasonable response when induced by a seismic load at different clamping levels. In conclusion, from the modelling point of view, the proposed simplified method for NHR200-II spacer grid is effective.
- Nuclear heating reactor,
- Fuel assembly,
- Spacer grid,
- Simplified method,
- Dynamic analysis

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References(10)

References

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