A Steam Generator Takeover Weld Seam Inspection Device

Abstract

The invention relates to the technical field of non-destructive testing on a loop system of a nuclear power station, and particularly discloses a testing device for welded joints of a steam generator adapter tube. The testing device comprises a supporting rod, an upper supporting mechanism, an axial scanning mechanism, a circumferential scanning mechanism, a lower supporting mechanism and a foreign matter collection mechanism. The upper supporting mechanism and a telescoping pole are fixed at the upper end of the supporting rod, and the lower supporting mechanism and the foreign matter collection mechanism are fixed on the lower end of the supporting rod. The axial scanning mechanism and the circumferential scanning mechanism are arranged on the supporting rod between the upper supporting mechanism and the lower supporting mechanism. In the beginning, the testing device is in a folded state, so that the radial dimension of the testing device can meet the requirements on entering and exiting from a manhole, and during working, the testing device can be unfolded, and the radial direction of the testing device can be fitted to the inner wall of the adapter tube. The axial location and the circumferential location are achieved. In addition, the upper supporting mechanism and the lower supporting mechanism improve the stability of the testing device in a scanning process. A driving mechanism is used for providing original driving force for the telescoping pole, the upper supporting mechanism, the lower supporting mechanism and the foreign matter collection mechanism, and therefore driving links are reduced, and the dead load of the testing device is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of a primary circuit system of a nuclear power plant, and in particular relates to a device for inspecting a weld seam of a steam generator nozzle. Background technique [0002] According to the relevant requirements of the ASME code, the steam generator of the nuclear power unit takes over the dissimilar metal weld as the thick-walled weld of the main circuit, which is a mandatory inspection content of the regulations, and the inspection range is 1 / 3 of the inner wall thickness of the weld. [0003] Up to now, the ultrasonic inspection of the weld of the steam generator of the nuclear power unit has chosen to approach from the outer wall of the weld. With the improvement of the design of the nuclear power unit, the wall thickness of the welded seam of the nozzle has been greatly increased compared with the previous one. Due to the limitations of the ultrasonic inspection method i...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a steam generator nozzle weld inspection device, which can solve the technical problems of the ultrasonic weld inspection device smoothly passing through the manhole and positioning, scanning and foreign matter collection inside the nozzle

Images