Validity Analysis of Rolled Plugs of Steam Generators Tube

The steam generators tube is a vulnerable part of the primary pressure boundary in nuclear power plants,and its integrity directly affects the safety of NPPs.The tube needs to be plugged when the steam generator（SG） primary side water may leak out to the secondary side because of crack,wear or corrosion of the tube.This paper analyzes a SG tube rolling plug with FEM,simulates and calculates the contact stress between the plug and tube in the process of the rolling plug and after the rolling,to confirm the validity of the plug.The result shows the plug meets the strength requirements.