Online ultrasonic detection apparatus and detection method for reactor coolant pump flange bolt

Abstract

The invention discloses an online ultrasonic detection apparatus and a detection method for a reactor coolant pump flange bolt. A guide rail is tightly installed on the outer circumference of a vertical reactor coolant pump body. A movable slide rest is installed on an annular guide rail. A revolution driving assembly is arranged on the slide rest. A fretting plate is installed on the slide rest through a tilting adaptive adjustment assembly, and can elastically tilt relative to the slide rest when a plate surface is subjected to an external force. The fretting plate and the slide rest are arranged parallel to each other with a gap in a lateral direction. A detection platform is installed on the fretting plate through a radial driving assembly, and comprises a supporting plate and a lifting plate, arranged parallel to each other with the gap in the lateral direction. A detection pipe is vertically arranged on the lifting plate, and comprises an inner pipe, a middle pipe and an outer pipe coaxially arranged from inside to outside. The apparatus also comprises a camera monitoring module. The apparatus can realize real-time adaptive adjustment of verticality of the detection pipe, reduces the limitation of the horizontality when the guide rail is installed on site, is convenient for quick installation and debugging on site, and is especially suitable for a special working place such as a nuclear power plant.

Description

technical field [0001] The invention relates to the field of in-service equipment detection of nuclear power plants, in particular to an on-line ultrasonic detection device for AP1000 main pump flange bolts and an on-line ultrasonic detection method using the device. Background technique [0002] AP1000 nuclear power plant reactor coolant pump casing flange bolts are the fasteners between the reactor coolant casing and the shielded motor pump. They work under high temperature and high pressure irradiation environment for a long time, and are prone to fatigue damage, which is an important force in the reactor. Consumable parts. In order to ensure the safe and reliable operation of the nuclear power plant, it is necessary to strictly inspect the flange bolts of the AP1000 main pump. The American ASME code stipulates that the flange bolts are the key inspection objects for pre-service and in-service inspections of nuclear power plants, and full-volume ultrasonic inspection must...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an online ultrasonic detection device and detection method for the flange bolts of the nuclear main pump, which can adaptively tilt the ultrasonic probe according to the coaxiality deviation between the ultrasonic probe and the center hole of the flange bolt to ensure that the two It is always coaxial, and there is no need to manually adjust the levelness of the guide rail on site. It is especially suitable for on-site inspection of in-service equipment in nuclear power plants, and the redundant space generated by the installation of drive motors and guide rails is fully and repeatedly used in the layout, which has a significant space saving effect and is effective. Solved the problem of limited space and insufficient travel in online ultrasonic testing of flange bolts

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