Dynamic Reliability Analysis of CRDM Pressure Shell under Multiple Failure Modes

Chen Peng; Zhu Yizhou; Zhang Kai; Xie Yongcheng

doi:10.13832/j.jnpe.2023.01.0118

Volume 44 Issue 1

Feb. 2023

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Chen Peng, Zhu Yizhou, Zhang Kai, Xie Yongcheng. Dynamic Reliability Analysis of CRDM Pressure Shell under Multiple Failure Modes[J]. Nuclear Power Engineering, 2023, 44(1): 118-123. doi: 10.13832/j.jnpe.2023.01.0118

Citation:

Chen Peng, Zhu Yizhou, Zhang Kai, Xie Yongcheng. Dynamic Reliability Analysis of CRDM Pressure Shell under Multiple Failure Modes[J]. Nuclear Power Engineering, 2023, 44(1): 118-123. doi: 10.13832/j.jnpe.2023.01.0118

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Dynamic Reliability Analysis of CRDM Pressure Shell under Multiple Failure Modes

doi: 10.13832/j.jnpe.2023.01.0118

Shanghai Nuclear Engineering Research & Design Institute Co., Ltd., Shanghai, 200233, China

Received Date: 2022-03-10
Rev Recd Date: 2022-11-18
Publish Date: 2023-02-15

Abstract

Abstract

To investigate the structural reliability of the control rod drive mechanism(CRDM), multiple failure modes of the CRDM pressure shell is considered, while the structural dynamic reliability model related to the CRDM step number is built by the stress-strength interference theory. The dynamic distribution model of the stress amplitude under the strength failure mode is represented by the order statistic. Based on Miner cumulative damage theory and fatigue equivalent stress distribution model, the relationship between fatigue life, cumulative damage distribution and the number of step impact loads is established. The results show that under the action of step impact load, the early structural reliability of pressure shell is mainly determined by the reliability of strength failure mode. When the step action reaches a certain number of times, the failure rate of fatigue failure mode starts to increase significantly; Compared with the fatigue failure mode, the reliability of the strength failure mode is more sensitive to the change of the mean stress.The results can provide reference for the reliability design and maintenance management of CRDM pressure shell.
- Control rod drive mechanism (CRDM),
- Stress-strength interference theory,
- Cumulative fatigue damage reliability,
- Dynamic reliability

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References(14)

References

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