Study on Fracture Failure Characteristics of Instrument Casing in Nuclear Power Plants

Yan Liang; LI Yang; Song Mingliang

doi:10.13832/j.jnpe.2017.S2.0167

Volume 38 Issue S2

Feb. 2025

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Yan Liang, LI Yang, Song Mingliang. Study on Fracture Failure Characteristics of Instrument Casing in Nuclear Power Plants[J]. Nuclear Power Engineering, 2017, 38(S2): 167-171. doi: 10.13832/j.jnpe.2017.S2.0167

Citation:

Yan Liang, LI Yang, Song Mingliang. Study on Fracture Failure Characteristics of Instrument Casing in Nuclear Power Plants[J]. Nuclear Power Engineering, 2017, 38(S2): 167-171. doi: 10.13832/j.jnpe.2017.S2.0167

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Study on Fracture Failure Characteristics of Instrument Casing in Nuclear Power Plants

doi: 10.13832/j.jnpe.2017.S2.0167

1. CNNC FuJian Fuqing Nuclear Power Co. Ltd., Fuzhou, 350318, China;
2 Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2017-08-10
Rev Recd Date: 2017-11-30

Abstract

Abstract

In this paper, the analysis on the casing and cladding metal were carried out by macro and micro methods, including the chemical composition analysis, microstructure analysis, fracture metallography and scanning electron microscopy（SEM）. The results showed that the microstructure and hardness of the casing and cladding metal were not uniform. Combined with theoretical analysis, it was concluded that the fracture property of retaining tube was fatigue fracture.The cause for fracture was welding residual stress, which results in the crack initiation under the vibration of fluid. It was suggested that the welding of the retaining sleeve should be avoided.
- Nuclear Power Plant,
- Casing,
- Fracture,
- Microstructure