Research on Foreign Body In-Service Cleaning Technology for Pressure Vessel Lower Head

To satisfy the need of cleaning solid impurity in the reactor pressure vessel lower head,foreign body pumping technology is studied.After designing a simplified force model of solid granule in fluid,relationship between the liquid velocity and both mass and density is elicited via analysis.Based on this,draining circuit and mechanical structure is engineered,and analysis and experiment are also conducted.The result shows that the equipment performs well,which proved the correctness of theoretical research.