Analysis and Treatment of Common Failure of the Turbine Driven Auxiliary Feedwater Pump in One Nuclear Power Station

1 Introduction Since the commissioning of the turbine driven auxiliary feedwater pump,within three years operation,a series of failures have occurred,such as failure of over-speed trip gear,low output,high vibration,trip gear reset failure,and so on.According to the manufacturer’s advice and on-site maintenance experience,we carried out modification on

1 Introduction Since the commissioning of the turbine driven auxiliary feedwater pump, within three years operation, a series of failures have occurred, such as failure of over-speed trip gear, low output, high vibration, trip gear reset failure, and so on. According to the manufacturer＇s advice and on-site maintenance experience, we carried out modification on the structure of the pump, optimized the acceptance criteria for test. In this paper, the analysis and treatment of major defects are briefly introduced, in order to facilitate the analysis of similar problems in other power plants.