A multifunctional detection device for nuclear fuel assemblies based on array flexible detection

Abstract

The invention discloses a nuclear fuel assembly multifunctional detecting device based on array type flexible detection. The nuclear fuel assembly multifunctional detecting device comprises a fuel roddeformation detecting unit, an oxidation film thickness detecting unit and a loading platform, wherein the fuel rod deformation detecting unit and the oxidation film thickness detecting unit are fixedly mounted on the loading platform, and the loading platform is rigidly connected with an external transfer platform. The nuclear fuel assembly multifunctional detecting device can adapt to various deformations of a fuel rod, can realize flexible contact and flexible measurement of the fuel rod, and improves detection precision while ensuring safety of the device. The nuclear fuel assembly multifunctional detecting device has various detection functions, and can realize high-precision detection of fuel rod deformation and oxidation film thickness on the surface of the fuel rod; the nuclear fuel assembly multifunctional detecting device innovatively adopts a fuel rod deformation detecting method for array detection, ensures the detection precision while greatly improving the detection efficiency, is simple and compact in structure, has good sealing performance, and is convenient in installation and high in universality.

Description

technical field [0001] The invention relates to the technical field of nuclear industry detection, in particular to a multifunctional detection device for nuclear fuel assemblies based on array type flexible detection. Background technique [0002] A nuclear power plant refers to a facility that converts nuclear energy into electrical energy through appropriate devices. Nuclear power plants use nuclear reactors instead of boilers in thermal power plants, and use nuclear fuel to generate heat in a special form of "combustion" in nuclear reactors, turning nuclear energy into thermal energy to heat water and generate steam. As the core components of nuclear power plants, nuclear fuel assemblies have the advantages of high output and convenient loading and unloading. During the operation of the nuclear reactor, the nuclear fuel assembly is immersed in the coolant / moderator located in the core of the nuclear reactor. Due to the oxidation reaction between the coolant / moderator an...

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Problems solved by technology

[0003] For this reason, extensive and in-depth research has been carried out on nuclear fuel assembly oxide film and deformation detection devices at home and abroad, and a variety of detection devices have been developed, such as the patent document "Detector and fuel rod oxide film thickness measurement device including the detector (CN102867555A) " discloses a detector and a fuel rod oxide film thickness measuring device including the detector. The transfer roller is used to move up and down, and the eddy current sensor is used to detect the thickness of the fuel rod cladding oxide film. However, the transfer area of ​​the detection device is Parallel to the transmission support area, it cannot adapt to the local deformation of the fuel rod, and its detection probe is directly fixed to the lower plate, making it difficult to achieve alignment; the patent document "Multifunctional detection equipment for spent fuel assemblies (CN107180658A)" discloses a spent fuel Component multifunctional detection equipment, using the oxide film and diameter measurement module installed on the adaptive floating platform to simultaneously detect the thickness and diameter of the fuel rod oxide film, the detection module is fixedly connected to the two-degree-of-freedom transfer platform through the adaptive floating platform , which can realize the self-adaptive adjustment of the fuel rod pose by the detection module, but due to the introduction of the flexible parts of the self-adaptive floating platform, it is difficult to effectively determine the relative position between the detection module and the transfer platform, which fundamentally limits the detection accuracy of the device; The patent document "A nuclear fuel detection device and method (CN107170499A)" provides a nuclear fuel detection device and method, which uses a camera to photograph the site of the nuclear fuel rod to be tested and displays the actual 3D shape of the nuclear fuel rod on the terminal. Detection of deformation of nuclear fuel assemblies, but the device does not yet have multiple detection functions such as fuel rod cladding oxide film thickness detection

[0004] In summary, although the existing nuclear fuel assembly detection devices have preliminarily realized the detection of key parameters such as the oxide film thickness of nuclear fuel assemblies, most of the detection devices only realize the detection of a single parameter of nuclear fuel assemblies, and cannot fully adapt to the fuel rods. Local deformation, and the flexible alignment of the probe and fuel rods cannot be guaranteed, and there are still outstanding problems such as complex structure, poor detection accuracy, and poor safety assurance

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