A steam generator heat transfer tube defect inspection device and its application method

Abstract

The invention belongs to the technical field of defect detection of industrial pressure pipelines, and in particular relates to a defect detection device and a using method thereof for a heat transfer tube of a steam generator. A front end of a conduit of the device is connected with a probe mechanism, and the rear end is connected with a push and pulling unit pusher; a first conduit sheath and a second conduit sheath are arranged outside the conduit and connected through a connecting flange; and a valve is arranged on the first conduit sheath and a sliding sealing component is arranged on the second conduit sheath. The pusher enables the conduit and the probe mechanism connected with the front end of the conduit to penetrate a manhole plate or a lower gland connecting pipe through the first conduit sheath and to be delivered to a lower gland water chamber of the steam generator and then delivered to the heat transfer tube of a steam generator so as to perform on-line defect detection. According to the device and the method, the operation of a reactor is not influenced, the power factor of a nuclear power plant is not influenced by the in-service inspection of the heat transfer tube of the steam generator, the detection is not limited by time, more heat transfer tubes can be chosen for the detection, and water leakage of the water chamber of the steam generator can be prevented due to good sliding sealing between the conduit and the conduit sheath.

Description

technical field [0001] The invention belongs to the technical field of defect inspection of industrial pressure pipes, and in particular relates to a defect inspection device for a heat transfer pipe of a steam generator and a method for using the same. Background technique [0002] In a nuclear power plant, the steam generator (SG) is a large-scale key equipment belonging to the first class of nuclear safety. The operating experience of foreign nuclear power plants shows that the SG heat transfer tube is the weakest link in the pressure boundary of the primary loop system. The actual service life of SG is only about 14 years on average, and the shortest is only 8 years, which is far from the design life of 30 to 40 years. According to statistics, the international unplanned shutdown losses caused by the leakage of SG tube bundles have reached more than 5.4 billion US dollars. In the pressurized water reactor, the SG heat transfer tube is an important barrier for the prima...

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Problems solved by technology

Its disadvantage is that it may miss detection

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