Steam generator heat-transfer pipe ultrasonic inspection system

Abstract

The invention relates to a steam generator heat-transfer pipe ultrasonic inspection system. The system comprises a probe assembly, a probe rotation device, a probe gate device and a conduit. The probe assembly comprises a probe clamper, several probes on the probe clamper and an ultrasonic cable connected to the ultrasonic probes. The probe rotation device comprises a sliding brush and a motor. The sliding brush comprises a motion part and a fixed part. An ultrasonic cable is partly connected to the motion part of the sliding brush. A motor output shaft is partly connected to the motion part of the sliding brush and drives the probe assembly to integrally move. The probe gate device is provided with a water supply pipe connector communicated with the interior of the probe gate device. The conduit goes through the probe gate device and is connected to the probe rotation device. Several cables and a water supply pipe are arranged in the conduit. One end of the cable is respectively connected to the fixed part of the sliding brush and the motor. One end of the water supply pipe is connected to the water supply pipe connector. The system realizes regular examination of a steam generator heat-transfer pipe matrix metal material and especially is a water immersion ultrasonic inspection system for detecting a pipe expanding transition region of a heat-transfer pipe and a pipe plate.

Description

technical field [0001] The invention relates to the technical field of nuclear engineering, in particular to an ultrasonic inspection system for heat transfer tubes of steam generators. Background technique [0002] A steam generator is a heat transfer device for internal heat transfer when there is a temperature difference between two or more fluids. It is an important device in the fields of petroleum and chemical industry. As the heat transfer surface of the steam generator, the heat transfer tube is in contact with hot and cold fluids during operation. It is subjected to high temperature and high pressure, medium impact, vibration, corrosion, etc. for a long time. It is the weak link in the pressure boundary of the main equipment. Therefore, regular inspections must be carried out in this area. [0003] The steam generator heat transfer tube is subjected to the alternating effects of temperature, stress, corrosion and other factors during the operation of the equipment,...

AI Technical Summary

Problems solved by technology

When performing eddy current inspection on steam generator heat transfer tubes, in addition to the defect signals of the heat transfer tubes, there are structures, tube processing, deposits, and different combinations of them, which will generate a large number of distorted signals, which will cause misjudgment and missed inspections, making it difficult for eddy current inspections

The inspection of heat transfer tubes of steam generators generally adopts eddy current testing technology, but the eddy current testing method has a low detection level for cracks with complex shapes, and the qualitative and quantitative defects are not accurate; The wall thickness is constantly changing, and there are differences in the two substrate materials of the heat transfer tube and the tube sheet. When using eddy current testing, the current cannot guarantee its accuracy, which will cause difficulties for eddy current testing.

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