核电厂汽轮机调节阀后疏水管道断裂分析及改进  

Failure Analysis and Improvement Measures of Drain Pipe of SteamTurbine Control Valve from Nuclear Power Plant

作　　者：胡四光 郭勇强 王军 Hu Siguang;Guo Yongqiang;Wang Jun(China Nuclear Industry Maintenance Co.,Ltd.,Shanghai 201702,China;Nuclear Power Operations Research(Shanghai)Co.,Ltd.,Shanghai 200126,China)

机构地区：[1]中核检修有限公司,上海201702 [2]核电运行研究(上海)有限公司,上海200126

出　　处：《发电设备》2023年第6期403-408,共6页Power Equipment

摘　　要：某核电厂汽轮机主蒸汽调节阀后的疏水管道接口位置断裂,导致蒸汽泄漏。根据疏水管道实际布置情况,对该管道的材料、焊接质量、振动应力等方面进行分析。结果表明:在低流量、小开度的情况下,湍流引起的压力波激励作用导致疏水管道振动,管道的二次应力过大,接近许用应力,最终引发了管道断裂。通过改变焊口结构、调整管线布置、增加疏水管道支撑结构等措施,有效地减缓了管道振动,保证了机组安全。The fracture of the interface section of the drain pipe that located behind the main steam regulating valve of steam turbine from one nuclear power plant caused the steam leakage. Based on the on-site drain pipe layout, the material, welding quality and vibration stress of the drain pipe were analyzed. Results show that, under the condition of low flow and small opening, the pressure wave excitation caused by turbulence leads to the fracture of the drain pipe, and the secondary stress of the drain pipe is large, which is close to the allowable stress of the material, leading to the fracture of drain pipe. The drain pipe vibration can be effectively reduced and the safety of the unit can be ensured through the adjustment of welding seam structure, drain pipe layout and supplementary construction of supporting structure.

关 键 词：疏水管 焊接 断裂 振动 

分 类 号：TM623[电气工程—电力系统及自动化]