Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis

Liu Jiaxin; Bao Yufeng; Zhe Na; Wang Jin; Duan Zhiyong; Liu Caixue; Yang Taibo

doi:10.13832/j.jnpe.2024.10.0049

Volume 46 Issue 5

Oct. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(5): 217-223

Liu Jiaxin, Bao Yufeng, Zhe Na, Wang Jin, Duan Zhiyong, Liu Caixue, Yang Taibo. Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis[J]. Nuclear Power Engineering, 2025, 46(5): 217-223. doi: 10.13832/j.jnpe.2024.10.0049

Citation:

Liu Jiaxin, Bao Yufeng, Zhe Na, Wang Jin, Duan Zhiyong, Liu Caixue, Yang Taibo. Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis[J]. Nuclear Power Engineering, 2025, 46(5): 217-223. doi: 10.13832/j.jnpe.2024.10.0049

Citation:

Liu Jiaxin, Bao Yufeng, Zhe Na, Wang Jin, Duan Zhiyong, Liu Caixue, Yang Taibo. Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis[J]. Nuclear Power Engineering, 2025, 46(5): 217-223. doi: 10.13832/j.jnpe.2024.10.0049

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Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis

doi: 10.13832/j.jnpe.2024.10.0049

Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-10-11
Rev Recd Date: 2025-04-30

Available Online: 2025-10-15

Publish Date: 2025-10-15

Abstract

Abstract

The loose parts carried by the coolant in the reactor primary circuit can move to the lower grating plate, causing collisions with the lower grating plate and further blocking the diversion hole. After being transmitted to the top cover of the reactor pressure vessel through internal structures, the collision mechanical noise of the lower grating plate experiences signal attenuation and is masked by the reactor background noise, making direct identification impossible. Therefore, this study first conducted simulation tests to obtain background noise data and weak collision mechanical noise data of the lower grating plate. Then, wavelet packet decomposition (WPD) combined with a kurtosis threshold method was used to denoise the weak collision mechanical noise submerged in background noise. Finally, based on the denoised collision signal, loose parts collision identification was performed, and a code for identifying collision events of the lower grating plate in the reactor was developed. Test results show that the proposed denoising method is effective, and the developed code can effectively identify the signals of lower grating plate collision events submerged in background noise.
- Lower grating plate,
- Weak collision mechanical noise,
- Wavelet packet decomposition (WPD),
- Kurtosis

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References(10)

References

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