Abstract: Condenser is the very important equipment in the steamship unit of the nuclear power plant and it plays a cooling effect on the heat circulation in the condensable steamship unit of the nuclear power plant. Pipe rupture in the process of operation might occur in its heat transfer canal and it will lead to the deterioration of water quality in the Second Circuit.This article introduced the helium leak examination method against the pipe rupture in the condenser in the steamship unit of the nuclear power plant, grasping the judgment method whether the pipe rupture occurs in heat transfer canal by researching the helium leak examination method on the in-service condenser. The on-site examination results indicated the developed examination technology apply well,it played an important effect on assuring the safety and economic operation of the nuclear power plant.