Drain Method for Spent Resin Transportation Penetration in AP1000 Local Leak Rate Test

It is necessary to drain and blow down for the penetration of Chemical and Volume Control System before containment local leak rate test in AP1000 Nuclear Power Plant.However,there is no drain valve in the lowest position because high radioactivity exists in operation condition.Normal drain methodology cannot be applied to this penetration.Based on practices in a nuclear power plant,advantages and disadvantages for different methods are analyzed and compared in this paper.Finally,three-step solution is used to drain:firstly drain by gravity,secondly suck water by vacuum pump and then blow down by compressed air.Using this method,the drain puzzle is handled safely and properly.Local leak rate test is performed successfully.