理化检验-物理分册2026，Vol.62Issue(8)：77-81,5.DOI:10.11973/lhjy-wl260200
沿海核电厂循环水过滤系统鼓网螺栓断裂原因
Reasons for the fracture of drum net bolts in the circulating water filtration system of coastal nuclear power plants
火旭鑫 1薛雨 1刘会强 2张度宝2
作者信息
- 1. 中广核苍南核电有限公司,温州 352000
- 2. 苏州热工研究院有限公司,苏州 215004
- 折叠
摘要
Abstract
The drum net bolts of the circulating water filtration system in a coastal nuclear power plant were broke.The causes of bolt fracture were analyzed using macroscopic observation,chemical composition analysis,mechanical property testing,metallographic examination,scanning electron microscopy,and energy spectrum analysis.The results show that the fracture mode of the bolt was early fatigue fracture under the coupling effect of vibration fatigue and seawater corrosion.Insufficient pre-tightening force during the bolt assembly stage resulted in loosening of bolts during equipment operation,significantly exacerbating the amplitude of operational vibration.At the same time,there was an inherent stress concentration effect at the chamfer position of the hexagonal head of the bolt.Under the continuous alternating vibration load,fatigue cracks were initiated and continued to propagate at this location.In addition,the continuous corrosion of chloride ions in seawater further accelerated the propagation rate of fatigue cracks,ultimately leading to bolt fracture.关键词
鼓网螺栓/疲劳断裂/应力集中/预紧力/腐蚀Key words
drum net bolt/fatigue fracture/stress concentration/pre-tightening force/corrosion分类
通用工业技术引用本文复制引用
火旭鑫,薛雨,刘会强,张度宝..沿海核电厂循环水过滤系统鼓网螺栓断裂原因[J].理化检验-物理分册,2026,62(8):77-81,5.
