Ultrasonic inspection device for guide clamping hole of guide cylinder of control rod

Abstract

The invention provides a control rod guide cylinder guide clamping hole ultrasonic inspection device which comprises an opening and closing assembly connecting block, a probe opening and closing fixing seat, a probe opening and closing pull rod, a probe opening and closing upper hinge rod and an ultrasonic inspection probe assembly. The probe opening and closing pull rod is arranged in the cavity in a penetrating mode, the probe opening and closing upper hinge rod is hinged to the side wall of the probe opening and closing fixing base, the upper hinge rod pressing end of the probe opening and closing upper hinge rod extends into the probe opening and closing fixing base, and the upper hinge rod opening and closing end of the probe opening and closing upper hinge rod extends out of the probe opening and closing fixing base. An ultrasonic inspection probe assembly is installed at the opening and closing end of the upper hinge rod, and a probe opening and closing pull rod is driven to axially move so as to rotate the probe opening and closing upper hinge rod. The ultrasonic inspection device for the guide clamping hole of the control rod guide cylinder can fully cover and inspect the guide hole in the guide plate.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of guide stuck holes in control rod guide cylinders of nuclear power plants, in particular to an ultrasonic inspection device for guide stuck holes in control rod guide cylinders. Background technique [0002] Reactor pressure vessel internals of nuclear power plants are one of the important equipment in the reactor body structure. They are installed in the reactor pressure vessel and are combined with reactor pressure vessel, control rod drive mechanism, fuel assembly and related components to realize the reactor function. . The guide cylinder assembly is an important part of the stack internals. Usually an upper stack internal contains dozens of guide cylinder assemblies, which guide and center the control rod assembly in the up and down movement in the stack. The upper guide cylinder is mainly composed of Assembly and the lower guide cylinder assembly. The bottom of the uppe...

AI Technical Summary

Problems solved by technology

[0004] Affected by multiple factors such as frequent up and down movement of control rods during reactor operation and microseisms caused by high-speed water flow, the guide hole of the control rod guide tube for a certain number of cycles is generally worn. This wear may lead to the risk of control rod sticking, which will affect the nuclear power plant. Therefore, after a certain period of operation of the nuclear power plant, a special ultrasonic inspection device for the guide hole of the control rod guide cylinder is usually used to measure the inner surface diameter of each guide hole of the 9-layer guide plate, so as to obtain the wear of the inner surface amount, and replace the guide cylinder with excessive wear according to the measurement results

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