A steam generator heat transfer tube ultrasonic inspection system

Abstract

The invention relates to an ultrasonic inspection system for a heat transfer tube of a steam generator, comprising a probe assembly, a probe rotating device, a probe door device, and a conduit; the probe assembly includes a probe clamp, several probes arranged on the probe clamp, and connected to the The ultrasonic cable; the probe rotating device includes a sliding brush and a motor; the sliding brush includes a moving part and a fixed part; the ultrasonic cable is connected to the moving part of the sliding brush; the output shaft of the motor is connected to the moving part of the sliding brush to drive the overall rotation of the probe assembly; There is a water supply pipe joint connected to the door device; the conduit passes through the probe door device and is connected to the probe rotating device; several cables and water supply pipes 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 with the water supply pipe joint. The invention can be aimed at the periodic inspection of the base metal material of the heat transfer tube of the steam generator, especially the water immersion ultrasonic inspection system for the inspection of the expansion tube transition area between the heat transfer tube and the tube sheet.

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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