Eddy current detection device for fuel rod

Abstract

The invention provides an eddy current detection device for a fuel rod. The eddy current detection device for the fuel rod comprises a guide cylinder, an installation plate, a driving device, a telescopic mechanism and an eddy current probe, wherein a through hole is formed in the installation plate; the guide cylinder is arranged at the upper end of the installation plate and is coaxial with the through hole; the driving device is arranged at the lower end of the installation plate and is connected with the telescopic mechanism; a movement direction of the telescopic mechanism is perpendicular to the axis of the guide cylinder and is positioned on the radial extension line of the guide cylinder; the end of the telescopic mechanism is connected with the eddy current probe; under the driving of the telescopic mechanism, the eddy current probe horizontally moves between a working position and a non-working position; when being at the working position, the eddy current probe is coaxial with the guide cylinder. The eddy current detection device for the fuel rod is connected with a fuel rod replacement device through the guide cylinder and can be used for detecting the fuel rod on line on the fuel rod replacement device; if the detected fuel rod is defective, the fuel rod can be directly repaired or replaced, so that the operation time is shortened, and the operation difficulty is reduced; moreover, the eddy current detection device for the fuel rod is reliable to move and high in accuracy.

Description

technical field [0001] The invention relates to the field of nuclear power plant detection, in particular to a fuel rod eddy current detection device. Background technique [0002] A fuel assembly in a nuclear power plant consists of a plurality of fuel rods arranged at regular intervals and fixed in the reactor. The fuel rods are in a state of high temperature, high pressure and high radioactivity for a long time during the operation of the reactor, coupled with the influence of foreign matter in the core, vibration and water flow impact, the fuel rods are prone to damage and leakage, so the fuel rods need to be regularly inspected For damage determination, damaged fuel rods need to be repaired or replaced in time. [0003] A key link in damage determination is to use a set of eddy current detection devices to detect damage to fuel rods, but the fuel rod detection environment is in a high radioactive area, which puts forward high requirements for the positioning and instal...

AI Technical Summary

Problems solved by technology

[0003] A key link in damage determination is the need to use a set of eddy current detection devices to detect damage to fuel rods, but the fuel rod detection environment is in a high radioactive area, which puts high requirements on the positioning and installation of eddy current probes

The eddy current detection device currently used has a complex structure, inconvenient manipulation, and low efficiency. The inspectors need to inspect the fuel rods near the reactor, which will cause health damage to the inspectors; There are many rods in the fuel rod, if it is found that the fuel rod needs to be replaced during the inspection, then the eddy current detection device needs to be removed and the fuel rod replacement device is used to replace the problematic fuel rod. The detection and replacement work need to be carried out separately, which will undoubtedly increase The workload of the inspectors will increase the working hours, and the investment will further increase. Therefore, in order to ensure the economy of fuel rod repair and replacement and the reliability of the inspection, the inspectors imagine that the fuel rods are lifted and lowered. detection and can be combined with replacement work, but there is no detection device that can achieve both detection accuracy and detection time

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