Nuclear power plant fuel assembly inspection apparatus

Abstract

The application discloses a nuclear power plant fuel assembly detection equipment, which comprises an image acquisition module, a measuring main body component and a calibration piece. The nuclear power plant fuel assembly detection equipment integrates the image acquisition module, the measuring main body component and the calibration piece structure, and has multiple functions of image acquisition, structure bearing, cable regulation and precision calibration. The calibration of the equipment is carried out by relying on the calibration piece, the measurement precision of the equipment is effectively improved, and the problem of large detection error of the traditional equipment is solved; the overall structure is compact, can be directly adapted to in-situ operation of fuel transmission pool unloading, does not need to reform the site layout, and realizes integration of appearance acquisition and size measurement. The image acquisition module is divided into an appearance inspection sub-module, a first size measurement sub-module and a second size measurement sub-module according to functions, the function partition is clear, the appearance inspection sub-module realizes full circumferential surface defect screening, two groups of size measurement sub-modules correspond to different measured surfaces respectively, and division of labor and cooperation are realized, so that the detection blind area is avoided.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant fuel assembly testing technology, and more particularly to a nuclear power plant fuel assembly testing device. Background Technology

[0002] In the existing technology, there is a device that can inspect the appearance of fuel assemblies and measure their deformation in the spent fuel pool transfer channel (hereinafter referred to as the transfer pool). This device is based on the original four-sided appearance inspection camera, and two more appearance inspection cameras are added to the two adjacent appearance inspection cameras in a "one-in-two" manner. It can simultaneously capture the upper and lower adjacent strips of the assembly. Through image distortion correction and image stitching and fusion technology, it can realize the appearance inspection of the assembly on all four sides, and also realize the deformation measurement of the two adjacent sides of the assembly. However, the device used in the transfer pool can only see the upper and lower strips of the fuel assembly at the same time, so the dimensional measurement accuracy of the device is low, only ±1mm. The device can only make a preliminary judgment on the overall deformation of the assembly, and cannot accurately measure the macroscopic dimensions of the fuel assembly, such as the assembly length, fuel rod length, the gap between the fuel rod and the upper tube seat, the gap between the fuel rod and the lower tube seat, the height of the compression spring, and the width of the assembly grid.

[0003] Additionally, there is another set of equipment used in the spent fuel pool (hereinafter referred to as the spent fuel pool). This equipment employs a 16-camera array, capable of simultaneously capturing complete images of the entire assembly. Through image distortion correction and image stitching fusion technology, a panoramic image of the fuel assembly can be obtained, thus enabling the measurement of the dimensions of the assembly's test surfaces. This equipment in the spent fuel pool cannot be used during unloading; a dedicated time window must be scheduled for measuring the relevant dimensions of the assembly. Furthermore, the fuel assembly must be specifically hoisted to a designated location for measurement, and each hoisting operation can only measure one side of the fuel assembly, resulting in low efficiency. Measurements using this equipment require a dedicated time window during major overhauls, significantly impacting the critical path of the overhaul and making convenient measurements impossible during overhauls.

[0004] Therefore, there is an urgent need to develop a fuel assembly testing device that can operate synchronously throughout the entire fuel assembly unloading process, integrate visual inspection and multi-dimensional dimensional measurement, is easy to assemble and disassemble, has high measurement accuracy, and is suitable for underwater working conditions in water tanks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a nuclear power plant fuel assembly testing device.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to construct a nuclear power plant fuel assembly detection device, which includes an image acquisition module, a measurement main component and a calibration component; The image acquisition module includes an appearance inspection submodule, a first size measurement submodule, and a second size measurement submodule. The appearance inspection submodule is used to acquire appearance images of each end face around the fuel assembly. The first size measurement submodule and the second size measurement submodule are both installed on the measurement main body component. The first size measurement submodule is set up corresponding to the first test surface of the fuel assembly and is used for size detection. The second size measurement submodule is set up corresponding to the second test surface of the fuel assembly and is used for size detection. The main measuring component is used to install and fix the image acquisition module, and to achieve the neatness and guidance of the wiring and cables; The calibration component is used to complete the overall calibration of the equipment.

[0007] In some embodiments, the number of the measuring main components is two, and the two measuring main components are a first measuring main body and a second measuring main body, respectively.

[0008] In some embodiments, the number of the appearance inspection sub-modules is four, and the four appearance inspection sub-modules collect appearance images of the four end faces of the fuel assembly in one-to-one correspondence. Five first dimension measurement sub-modules are installed on the first measurement body and are arranged facing each other relative to the first test surface of the fuel assembly; Five second dimension measurement sub-modules are mounted on the second measurement body and are arranged facing each other relative to the second test surface of the fuel assembly.

[0009] In some embodiments, each of the image acquisition modules includes a sealed main body, a sealed cover plate, a sealed glass, a sealed gland, a camera mounting plate, a camera mechanism, a camera lens, a reflector mounting base, a reflector, and an illumination module; The sealing cover is sealed and pressed onto the sealing main body, and the sealing glass is locked and fixed onto the sealing main body by the sealing cover; The sealed main body, the sealed cover plate, the sealed glass and the sealed pressure cap cooperate with each other to form a sealed and waterproof structure; The camera mounting plate is assembled inside the sealed main body, the camera mechanism is mounted on the camera mounting plate, and the camera lens is assembled on the shooting end of the camera mechanism. The camera mechanism and the camera lens work together to achieve image acquisition and video recording. The reflector mounting base is installed on the inner wall of the sealed main compartment, the reflector is installed on the reflector mounting base, and the lighting module is installed on the sealed main compartment.

[0010] In some embodiments, the measuring main body components are assembled from a lower measuring main body component and an upper measuring main body component; The lower part of the measuring body includes a lower rectangular tube body, a lower cable routing groove, a lower first direction bearing pin, a lower second direction bearing pin, and a lower quick-release structure; The lower rectangular tube body has a lower mounting notch that matches the shape of the image acquisition module; the lower cable routing groove is installed on the lower rectangular tube body for cable storage and guiding of the image acquisition module. The lower quick-release structure is locked and fixed to the lower rectangular tube body by the lower first direction bearing pin and the lower second direction bearing pin.

[0011] In some embodiments, the upper component of the measuring body includes an upper rectangular tube body, a quick-release structure at the lower end of the equipment body, a quick-release structure at the lower end of the equipment long rod, an upper first-direction bearing pin, an upper second-direction bearing pin, and an upper cable routing groove; the upper rectangular tube body has an upper mounting notch that matches the shape of the image acquisition module; Both the quick-release structure at the lower end of the main body of the equipment and the quick-release structure at the lower end of the long rod of the equipment are assembled onto the upper rectangular tube body through the upper first direction bearing pin and the upper second direction bearing pin; The upper cable routing groove is installed on the upper rectangular tube body and is used for the orderly guidance of cables in the upper area.

[0012] In some embodiments, the quick-release structure at the lower end of the main body of the device, the quick-release structure at the lower end of the long rod of the device, and the lower quick-release structure are all equipped with a number of hand-tightened wing bolts for manual quick disassembly, assembly, and locking of components.

[0013] In some embodiments, the calibration component is composed of an upper calibration component and a lower calibration component spliced ​​together; the upper calibration component includes an upper rectangular tube body, an upper connector at the equipment end of the calibration component, a lower connector of the calibration component, and a lifting ring; Both the upper section connector of the calibration component and the lower section connector of the calibration component are installed on the upper section rectangular tube body of the calibration component. The upper section connector of the calibration component is used to cooperate with the external long rod to achieve quick assembly and disassembly, and the lower section connector of the calibration component is used to quickly dock and assemble with the lower section calibration component. The lifting ring is installed on the upper section connector of the calibration component.

[0014] In some embodiments, the lower calibration component includes a lower calibration component rectangular tube body and an upper calibration component connector; The upper calibration component connector is installed on the lower calibration component rectangular tube body. The upper calibration component connector is equipped with a hand-tightened wing nut to enable quick assembly, disassembly, and locking of the upper and lower calibration components.

[0015] In some embodiments, calibration plate grooves for embedding and fixing calibration plates are provided on the side walls of both the upper rectangular tube body of the calibration component and the lower rectangular tube body of the calibration component.

[0016] Implementing this invention offers the following advantages: This nuclear power plant fuel assembly inspection equipment integrates an image acquisition module, a main measurement component, and a calibration component structure, combining multiple functions such as image acquisition, structural support, cable management, and accuracy calibration. Calibration of the equipment using the calibration component effectively improves measurement accuracy, overcoming the problem of large inspection errors in traditional equipment. The compact overall structure allows for direct adaptation to in-situ unloading operations in the fuel transfer pool, eliminating the need for site layout modifications and achieving integrated visual inspection and dimensional measurement. Furthermore, the image acquisition module is functionally divided into a visual inspection submodule, a first dimensional measurement submodule, and a second dimensional measurement submodule, with clear functional zoning. The visual inspection submodule performs full-circumference defect screening, while the two dimensional measurement submodules correspond to different surfaces to be measured, working collaboratively to avoid blind spots and achieving both comprehensive visual inspection and precise directional dimensional measurement, thus enhancing the overall inspection coverage. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a nuclear power plant fuel assembly testing device in some embodiments of the present invention; Figure 2 This is a schematic diagram of a nuclear power plant fuel assembly detection device in the unloading process according to some embodiments of the present invention; Figure 3 This is an internal structural diagram of the image acquisition module in some embodiments of the present invention; Figure 4 This is an external structural diagram of the image acquisition module in some embodiments of the present invention; Figure 5 These are schematic diagrams of the measuring main component in some embodiments of the present invention; Figure 6 This is a schematic diagram of the structure of the calibration component in some embodiments of the present invention. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0019] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0020] Please see Figures 1 to 6 This is a nuclear power plant fuel assembly testing device according to some embodiments of the present invention, which includes an image acquisition module 1, a measurement main component 2, and a calibration component 3. For example... Figure 1As shown, the image acquisition module 1 includes an appearance inspection submodule 11, a first dimension measurement submodule 12, and a second dimension measurement submodule 13. The appearance inspection submodule 11 is used to acquire appearance images of each end face around the fuel assembly 5. The first dimension measurement submodule 12 and the second dimension measurement submodule 13 are both mounted on the measurement main component 2. The first dimension measurement submodule 12 is arranged corresponding to the first test surface of the fuel assembly 5 and is used for dimension detection, while the second dimension measurement submodule 13 is arranged corresponding to the second test surface of the fuel assembly 5 and is used for dimension detection. The measurement main component 2 is used to install and fix the image acquisition module 1 and to realize the neatness and guidance of the wiring and cables. The calibration component 3 is used to complete the overall calibration of the equipment. Among them, to facilitate the definition of structure and detection logic, two adjacent perpendicular surfaces of the fuel assembly are defined as the first test surface and the second test surface, respectively. This nuclear power plant fuel assembly inspection equipment integrates the image acquisition module 1, the measurement main component 2, and the calibration component 3, taking into account multiple functions such as image acquisition, structural support, cable neatness, and accuracy calibration. The equipment is calibrated using calibration component 3, effectively improving measurement accuracy and overcoming the problem of large detection errors in traditional equipment. Its compact overall structure allows for direct adaptation to in-situ unloading operations at fuel transfer pools, eliminating the need for site layout modifications and achieving integrated visual acquisition and dimensional measurement. Furthermore, the image acquisition module 1 is functionally divided into a visual inspection submodule 11, a first dimensional measurement submodule 12, and a second dimensional measurement submodule 13. This clear functional division allows the visual inspection submodule 11 to screen for defects across the entire circumference, while the two dimensional measurement submodules correspond to different surfaces to be measured, working collaboratively to avoid blind spots and achieving both comprehensive visual inspection and precise directional dimensional measurement, thus enhancing the overall comprehensiveness of the inspection.

[0021] In this embodiment, as Figure 1 As shown, there are two main measuring components 2, namely the first measuring component 21 and the second measuring component 22. There are four visual inspection sub-modules 11, which collect visual images of the four end faces of the fuel assembly 5 in a one-to-one correspondence. Figure 2 Labeled 001-004. Based on the requirements for multi-point dimension fitting and deformation global evaluation of the surface to be measured, five first dimension measurement sub-modules 12 are installed on the first measurement body 21 and are arranged facing each other relative to the first surface to be measured of the fuel assembly 5. The five first dimension measurement sub-modules 12 correspond to Figure 2 Reference numerals 005-009; Five second-dimensional measurement sub-modules 13 are mounted on the second measurement body 22 and are arranged facing each other relative to the second test surface of the fuel assembly 5. The five second-dimensional measurement sub-modules 13 correspond to Figure 2Label 010-014. The dual measuring bodies are arranged on both sides of the fuel assembly 5, resulting in balanced structural stress and strong installation stability. The layout design with four appearance sub-modules covering all four sides and two sets of size sub-modules arranged in layers allows for the simultaneous acquisition of multi-position dimensions of two adjacent test surfaces of the fuel assembly 5 without the need for flipping or hoisting the components, significantly shortening the testing time and meeting the tight schedule requirements of major overhauls.

[0022] like Figure 3 and Figure 4 As shown, each image acquisition module 1 includes a sealed main body 101, a sealed cover plate 102, a sealed glass 103, a sealed pressure cover 104, a camera mounting plate 105, a camera mechanism 106, a camera lens 107, a reflector mounting base 108, a reflector 109, and an illumination module 110. The sealing cover 102 is sealed and pressed onto the sealed main body 101, and the sealing glass 103 is locked and fixed onto the sealed main body 101 by the sealing cover 104. The sealed main body 101, sealing cover 102, sealing glass 103 and sealing cover 104 cooperate to form a sealed and waterproof structure. The camera mounting plate 105 is assembled inside the sealed main body 101, the camera mechanism 106 is mounted on the camera mounting plate 105, and the camera lens 107 is mounted on the shooting end of the camera mechanism 106. The camera mechanism 106 and the camera lens 107 cooperate to realize image acquisition and video recording. The reflector mounting base 108 is installed on the inner wall of the sealed main body 101, the reflector 109 is installed on the reflector mounting base 108, and the lighting module 110 is installed on the sealed main body 101.

[0023] Specifically, the sealing cover 102 is pressed onto the sealed main body 101 by screws, and the sealing glass 103 is screwed onto the sealed main body 101 by the sealing gland 104. The sealed main body 101, sealing cover 102, sealing glass 103, and sealing gland 104 achieve the sealing of the main body, ensuring that the equipment can be used underwater. The camera mounting plate 105 is mounted onto the sealed main body 101 by screws, the camera mechanism 106 is mounted onto the camera mounting plate 105 by screws, and the camera lens 107 is screwed onto the camera mechanism 106. The camera mechanism 106 and the camera lens 107 enable the video recording function of the equipment. The reflector mounting base 108 is mounted onto the sealed main body 101 by screws, and the reflector 109 is mounted onto the reflector mounting base 108 by screws. The imaging through the reflector 109 enhances the radiation resistance of the mechanism and extends the service life of the camera. The lighting module 110 is mounted onto the sealed main body 101 by screws to provide sufficient lighting for camera shooting. The fully sealed cavity structure is suitable for long-term immersion in water tanks, with excellent waterproof, dustproof, and corrosion-resistant performance. The reflector 109 structure can effectively reduce the damage of nuclear radiation to the camera core 106 and extend the service life of the equipment. The independent lighting module 110 ensures imaging quality in the dim underwater environment. The modular integrated design of the camera is compact, easy to disassemble and assemble, and adaptable to the special and harsh working conditions of nuclear power plants.

[0024] like Figure 5As shown, the main measuring component 2 is assembled from a lower measuring component 211 and an upper measuring component 212. The lower measuring component 211 includes a lower rectangular tube body 2111, a lower cable routing groove 2112, a lower first-direction support pin 2113, a lower second-direction support pin 2114, and a lower quick-release structure 2115. The lower rectangular tube body 2111 has a lower mounting notch 21111 that matches the shape of the image acquisition module 1. The lower cable routing groove 2112 is installed on the lower rectangular tube body 2111 for cable storage and guiding of the image acquisition module 1. The lower quick-release structure 2115 is locked and fixed to the lower rectangular tube body 2111 by the lower first-direction support pin 2113 and the lower second-direction support pin 2114. Specifically, the lower rectangular tube body 2111 is provided with a lower mounting notch 21111, which is adapted to the image acquisition module 1 for mounting and fixing the image acquisition module 1; the lower cable routing groove 2112 is fixed to the lower rectangular tube body 2111 with screws for guiding the cable of the image acquisition module 1; since the image acquisition module 1 is relatively heavy, a lower first-direction support pin 2113 and a lower second-direction support pin 2114 are provided in the lower part of the measuring body 211, and the lower quick-release structure 2115 is fixed to the lower rectangular tube body 2111 through the lower first-direction support pin 2113, the lower second-direction support pin 2114 and screws. The measuring body adopts an upper and lower split structure, and the lower rectangular tube body 2111 has a dedicated mounting notch to ensure the installation and positioning accuracy of the acquisition module; the independent cable routing groove avoids problems such as cable tangling, wear, and aging due to water immersion; the bidirectional support pin structure can effectively support the weight of multiple acquisition modules, improve the overall structural strength and deformation resistance, and is suitable for long-term underwater heavy-duty use.

[0025] The upper component 212 of the measuring body includes an upper rectangular tube body 2121, a quick-release structure 2122 at the lower end of the equipment body, a quick-release structure 2123 at the lower end of the equipment long rod, an upper first-direction bearing pin 2124, an upper second-direction bearing pin 2125, and an upper cable routing groove 2126. The quick-release structure 2122 at the lower end of the equipment body is used to dock and lock with the lower component 211 of the measuring body. The quick-release structure 2123 at the lower end of the equipment long rod is used for quick assembly of an external operating long rod. The upper rectangular tube body 2121 has an upper mounting notch 21211 that matches the shape of the image acquisition module 1. The quick-release structures 2122 and 2123 at the lower end of the equipment body are both assembled onto the upper rectangular tube body 2121 through the upper first-direction bearing pin 2124 and the upper second-direction bearing pin 2125. The upper cable routing groove 2126 is installed on the upper rectangular tube body 2121 for the neat guidance of cables in the upper area. Specifically, the upper rectangular tube body 2121, like the lower rectangular tube body 2111, is provided with an upper mounting notch 21211 for accommodating the image acquisition module 1. The quick-release structure 2122 at the lower end of the device body is fixed to the upper rectangular tube body 2121 by upper first direction bearing pin 2124, upper second direction bearing pin 2125, and screws. The quick-release structure 2123 at the lower end of the device long rod is also fixed to the upper rectangular tube body 2121 by upper first direction bearing pin 2124, upper second direction bearing pin 2125, and screws. The upper component 212 of the measuring body is also provided with an upper cable routing groove 2126, which is also fixed to the upper rectangular tube body 2121 by screws for guiding the cable of the image acquisition module 1. The upper component integrates a quick-release docking structure and a long pole connection structure, which not only enables rapid assembly of the upper and lower components, but also facilitates quick docking of the entire equipment with the water tank's fixed support. The bidirectional load-bearing pins provide unified limiting and fixing, ensuring the coaxiality and stability of the upper structure installation, further optimizing the cable management layout, and improving the equipment's neatness and operational safety.

[0026] Several hand-tightened wing bolts are installed on the quick-release structure 2122 at the lower end of the main body of the equipment, the quick-release structure 2123 at the lower end of the long rod of the equipment, and the lower quick-release structure 2115. These are used to enable manual and quick disassembly, assembly, and locking of components. The uniform configuration of hand-tightened wing bolts at each joint eliminates the need for wrenches, screwdrivers, or other specialized tools. Operators can manually and quickly complete disassembly, assembly, inspection, and replacement, reducing the difficulty of operations within the confined space of a nuclear power plant, shortening equipment maintenance time, and improving maintenance efficiency.

[0027] like Figure 6As shown, calibration component 3 is composed of an upper calibration component 31 and a lower calibration component 32. The upper calibration component 31 includes an upper rectangular tube body 311, an upper equipment end connector 312, a lower equipment end connector 313, and a lifting ring 314. Both the upper equipment end connector 312 and the lower equipment end connector 313 are mounted on the upper rectangular tube body 311. The upper equipment end connector 312 is used to cooperate with an external long rod for quick assembly and disassembly, and the lower equipment end connector 313 is used for quick docking and assembly with the lower calibration component 32. The lifting ring 314 is mounted on the upper equipment end connector 312. Calibration component 3 adopts an upper and lower segmented structure, equipped with dedicated connectors and lifting ring 314, which facilitates hoisting, transportation, on-site deployment, and storage.

[0028] The lower calibration component 32 includes a lower calibration component rectangular tube body 321 and an upper calibration component connector 322. The upper calibration component connector 322 is installed on the lower calibration component rectangular tube body 321. A hand-tightened wing nut is fitted on the upper calibration component connector 322 to enable quick assembly, disassembly, and locking of the upper calibration component 31 and the lower calibration component 32. The lower calibration component 32 is equipped with a hand-tightened wing nut, enabling tool-free quick assembly and disassembly of the upper and lower calibration components 31. The calibration operation preparation process is simple and quick, with a low operating threshold, making it suitable for short-term concentrated operation modes during power plant overhauls.

[0029] Both the upper rectangular tube body 311 and the lower rectangular tube body 321 of the calibration component have calibration plate grooves 3111 on their side walls for mounting and fixing the calibration plate. The calibration plate grooves 3111 limit and fix the calibration plate, preventing the calibration plate from shifting, falling off, or wrinkling, and ensuring the stability and accuracy of the calibration reference.

[0030] Compared with the prior art, the present invention has the following overall advantages: Optimized operation mode: The entire process of unloading fuel assembly 5 can be monitored simultaneously without occupying the critical time window of the overhaul, without the need for secondary hoisting and transfer of the assembly, and without affecting the critical path of the overhaul, thus significantly improving the production efficiency of the power plant overhaul. Improved detection performance: The multi-camera array is deployed in layers, eliminating blind spots and improving measurement accuracy. It can accurately detect various parameters such as fuel assembly deformation, gap, spring height, and defect size, providing comprehensive detection dimensions. Strong environmental adaptability: The fully sealed waterproof structure and radiation-resistant optical design make it suitable for harsh working conditions such as high radiation, high humidity, and underwater immersion in fuel transfer pools. The equipment has strong operational stability and long service life. Reasonable structural design: modular, split, and quick-disassembly integrated design, with each component independent and uncoupled, making disassembly, maintenance, and replacement convenient, reducing operation and maintenance costs and operational difficulty; Convenient and reliable calibration: The split calibration component 3, combined with the standard calibration plate structure, simplifies the calibration process, ensures stable benchmarks, and guarantees the accuracy and consistency of long-term test data. It can provide continuous and accurate measured data support for the study of the irradiation characteristics of fuel assembly 5.

[0031] In a specific embodiment, such as Figure 1 As shown, before unloading fuel during a nuclear power plant overhaul, calibration component 3 is first placed in the same position as fuel assembly 5. Each image acquisition module 1 can acquire calibration plate data on calibration component 3. Through image post-processing, the proportional relationship of the images can be obtained. After the equipment calibration is completed, it can wait for unloading. During the unloading process, such as... Figure 2 As shown, fuel assembly 5 is lifted from the fuel carrier. Visual inspection submodules 001-004 can then acquire images of all four sides of fuel assembly 5, enabling visual inspection of all four sides. After the assembly is lifted into position, the first dimension measurement submodules 005-009 can acquire images of the eighth strip on the first surface to be measured, the lower pipe seat of fuel assembly 5, the sixth strip of fuel assembly 5, the third small strip of fuel assembly 5, the third strip of fuel assembly 5, and the first strip. The second dimension measurement submodules 010-014... Images of the eighth strip on the second test surface of the component, the lower tube seat of fuel assembly 5, the sixth strip of fuel assembly 5, the third small strip of fuel assembly 5, the third strip of fuel assembly 5, and the first strip can be acquired separately. By using the spatial attitude calibration technology of a multi-camera array under non-overlapping field of view, panoramic stitching of the component can be achieved. This enables the measurement of the component growth after irradiation, fuel rod growth, bending deformation of fuel assembly 5, height of the compression spring, gap between fuel rod and upper and lower tube seats, defect size, and foreign object size, with an accuracy of ±0.04mm.

[0032] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant fuel assembly testing device, characterized in that, It includes an image acquisition module (1), a measurement main body component (2), and a calibration component (3); The image acquisition module (1) includes an appearance inspection submodule (11), a first size measurement submodule (12), and a second size measurement submodule (13). The appearance inspection submodule (11) is used to acquire appearance images of each end face around the fuel assembly (5). The first size measurement submodule (12) and the second size measurement submodule (13) are both installed on the measurement main body component (2). The first size measurement submodule (12) is arranged on the first test surface of the fuel assembly (5) and used for size detection. The second size measurement submodule (13) is arranged on the second test surface of the fuel assembly (5) and used for size detection. The main measuring component (2) is used to install and fix the image acquisition module (1) and to realize the neatness and guidance of the line cable; The calibration component (3) is used to complete the overall calibration of the equipment.

2. The nuclear power plant fuel assembly testing equipment according to claim 1, characterized in that, The number of the measuring main body components (2) is two, and the two measuring main body components (2) are the first measuring main body (21) and the second measuring main body (22).

3. The nuclear power plant fuel assembly testing equipment according to claim 2, characterized in that, The number of the appearance inspection sub-modules (11) is four, and the four appearance inspection sub-modules (11) collect appearance images of the four end faces of the fuel assembly (5) in a one-to-one correspondence. Five first dimension measurement sub-modules (12) are installed on the first measurement body (21) and are arranged facing each other relative to the first test surface of the fuel assembly (5); Five second dimension measurement sub-modules (13) are installed on the second measurement body (22) and are arranged facing each other relative to the second test surface of the fuel assembly (5).

4. The nuclear power plant fuel assembly testing equipment according to claim 1, characterized in that, Each of the image acquisition modules (1) includes a sealed main body (101), a sealed cover plate (102), a sealed glass (103), a sealed cover (104), a camera mounting plate (105), a camera mechanism (106), a camera lens (107), a reflector mounting base (108), a reflector (109), and an illumination module (110). The sealing cover plate (102) is sealed and pressed onto the sealing main body (101), and the sealing glass (103) is locked and fixed onto the sealing main body (101) by the sealing cover (104); The sealed main body (101), the sealed cover plate (102), the sealed glass (103), and the sealed pressure cover (104) cooperate with each other to form a sealed and waterproof structure; The camera mounting plate (105) is assembled inside the sealed main body (101), the camera mechanism (106) is mounted on the camera mounting plate (105), and the camera lens (107) is assembled on the shooting end of the camera mechanism (106). The camera mechanism (106) and the camera lens (107) work together to achieve image acquisition and video recording. The reflector mounting base (108) is installed on the inner wall of the sealed main body (101), the reflector (109) is installed on the reflector mounting base (108), and the lighting module (110) is installed on the sealed main body (101).

5. The nuclear power plant fuel assembly testing equipment according to claim 1, characterized in that, The main measuring components (2) are all assembled from the lower measuring component (211) and the upper measuring component (212); The lower part of the measuring body (211) includes a lower rectangular tube body (2111), a lower cable routing groove (2112), a lower first direction bearing pin (2113), a lower second direction bearing pin (2114), and a lower quick-release structure (2115). The lower rectangular tube body (2111) has a lower mounting notch (21111) that matches the shape of the image acquisition module (1). The lower cable routing groove (2112) is installed on the lower rectangular tube body (2111) for cable storage and guiding arrangement of the image acquisition module (1); The lower quick-release structure (2115) is locked and fixed to the lower rectangular tube body (2111) by the lower first direction bearing pin (2113) and the lower second direction bearing pin (2114).

6. The nuclear power plant fuel assembly testing equipment according to claim 5, characterized in that, The upper part (212) of the measuring body includes an upper rectangular tube body (2121), a quick-release structure at the lower end of the equipment body (2122), a quick-release structure at the lower end of the equipment long rod (2123), an upper first direction bearing pin (2124), an upper second direction bearing pin (2125), and an upper cable routing groove (2126). The upper rectangular tube body (2121) has an upper mounting notch (21211) that matches the shape of the image acquisition module (1). The quick-release structure (2122) at the lower end of the main body of the equipment and the quick-release structure (2123) at the lower end of the long rod of the equipment are both assembled onto the upper rectangular tube body (2121) through the upper first direction bearing pin (2124) and the upper second direction bearing pin (2125); The upper cable routing groove (2126) is installed on the upper rectangular tube body (2121) for the orderly guidance of cables in the upper area.

7. The nuclear power plant fuel assembly testing equipment according to claim 6, characterized in that, Several hand-tightened wing bolts are installed on the quick-release structure (2122) at the lower end of the main body of the equipment, the quick-release structure (2123) at the lower end of the long rod of the equipment, and the lower quick-release structure (2115) to realize manual quick disassembly and locking between components.

8. The nuclear power plant fuel assembly testing equipment according to claim 1, characterized in that, The calibration component (3) is composed of an upper calibration component (31) and a lower calibration component (32) joined together; The upper calibration component (31) includes the upper rectangular tube body (311), the upper connector (312) of the equipment end of the calibration component, the lower connector (313) of the calibration component, and the lifting ring (314). The upper section connector (312) of the calibration component and the lower section connector (313) of the calibration component are both installed on the upper section rectangular tube body (311) of the calibration component; The upper section connector (312) of the calibration component is used to cooperate with the external long rod to achieve quick assembly and disassembly, and the lower section connector (313) of the calibration component is used to quickly dock and assemble with the lower section calibration component (32). The lifting ring (314) is installed on the upper section connector (312) of the calibration component equipment.

9. The nuclear power plant fuel assembly testing equipment according to claim 8, characterized in that, The lower calibration component (32) includes the lower calibration component rectangular tube body (321) and the upper calibration component connector (322); The upper calibration component connector (322) is installed on the lower calibration component rectangular tube body (321). The upper calibration component connector (322) is equipped with a hand-tightened wing nut to enable quick disassembly and locking of the upper calibration component (31) and the lower calibration component (32).

10. The nuclear power plant fuel assembly testing equipment according to claim 9, characterized in that, The upper rectangular tube body (311) of the calibration component and the lower rectangular tube body (321) of the calibration component are both provided with calibration plate grooves (3111) for mounting and fixing calibration plates.

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