Cause Analysis on Fracture of Flange Bolts of Low Pressure Steam Inlet Pipe in Nuclear Power Plant

FANG Jiang; ZHAO Yongming; LIU Hongqun

doi:10.11973/lhjy-wl202008014

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2020 > 56(8): 59-61,65. > DOI: 10.11973/lhjy-wl202008014

FANG Jiang, ZHAO Yongming, LIU Hongqun. Cause Analysis on Fracture of Flange Bolts of Low Pressure Steam Inlet Pipe in Nuclear Power Plant[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2020, 56(8): 59-61,65. DOI: 10.11973/lhjy-wl202008014

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Cause Analysis on Fracture of Flange Bolts of Low Pressure Steam Inlet Pipe in Nuclear Power Plant

1. CNNC Nuclear Power Operations Management Co., Ltd., Jiaxing 314300, China;
2. Suzhou Nuclear Power Research Institute, Suzhou 215004, China

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Received Date: February 09, 2020

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Abstract

The flange bolts of low pressure steam inlet pipe fractured during disassembly in a nuclear power plant. The fracture causes of the bolts were analyzed by means of chemical composition analysis, hardness test, metallographic examination, fracture analysis and stress analysis. The results show that the hardness mismatch between the bolts and the nuts caused the flange bolts of the low pressure steam inlet pipe to bite. In the process of disassembly, under the action of excessive torsional shear force, the bolts had ductile fracture.
- bolt,
- stress concentration,
- ductile fracture,
- torsional,
- shear

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