Cause Analysis and Treatment of Pipeline Vibration of Check Valve in Fuqing Nuclear Power Plant

The auxiliary steam converter system (STR) of Unit 2 of Fuqing Nuclear Power Plant drains from the drain to the deaerator line during normal power operation. The severe vibration of the pipeline poses potential hidden dangers to the safety, stability and economic operation of the nuclear power plant. According to the analysis of the vibration problem of this pipeline, the theoretical analysis of the amount of hydrophobicity during normal power operation is carried out to find out the root cause of the severe vibration of the analysis pipeline, and corresponding special treatment measures are formulated according to the analysis and the experience of vibration treatment at home and abroad, and finally the vibration is eliminated completely to make the system safe and reliable. (authors)