A measurement system for a fuel assembly

Abstract

The present application relates to a kind of fuel assembly measurement systems, including pool wall hanger, long rod component, multiple first measurement components arranged on long rod component, at least one second measurement component, multiple first measurement components are arranged along the length direction of long rod component, each first measurement component includes first image acquisition device and laser generator, by laser generator to make the image between adjacent first image acquisition device is collected to realize splicing, second measurement component includes moving platform and second image acquisition device that can be uniformly horizontally slid on moving platform.The system is fixed to pool wall by pool wall hanger, long rod component is used to arrange the required component according to actual measurement requirement, to realize the panoramic shooting of the fuel assembly to be measured, according to the image proportion relationship of calibration before measurement, obtains the various measurement data of fuel assembly, and the measurement of the distance between fuel rod to be measured can be realized by second measurement component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power measurement equipment, in particular to a fuel assembly measurement system. BACKGROUND

[0002] At present, most nuclear power plants are operating pressurized water reactor nuclear power plants with more mature technology and higher safety. Based on the demand for nuclear power technology self-reliance, many domestic units are actively developing self-reliance nuclear fuel assembly research and development of pressurized water reactor nuclear power plants. As a core component in the reactor core of the nuclear power plant, the nuclear fuel assembly is the key point of nuclear reaction safety monitoring. Due to the comprehensive influence of thermal expansion, irradiation growth, irradiation creep, and mechanical action between adjacent assemblies, the nuclear fuel assembly will produce bending or deformation, etc. When the error exceeds a certain safety range, the components in the nuclear fuel assembly cannot be successfully installed or refueled, which will bring great risks.

[0003] However, the measurement device in the related art is a contact type measurement, and the obtained data is limited, which cannot fully reflect the data changes, that is, it cannot perform multi-size photographing measurement on the irradiated fuel assembly. At the same time, the whole measurement device is relatively complex, and when the environmental temperature changes greatly, the accuracy and efficiency of the measurement cannot be guaranteed. SUMMARY

[0004] Therefore, it is necessary to provide a fuel assembly measurement system capable of stably and efficiently measuring the position of the irradiated nuclear fuel assembly in view of the problem that the measurement device in the related art cannot stably and efficiently perform multi-size photographing measurement on the irradiated fuel assembly.

[0005] A fuel assembly measurement system includes a measurement unit, the measurement unit includes a pool wall hanger, a long rod member connected with the pool wall hanger, a plurality of first measurement assemblies arranged on the long rod member, and at least one second measurement assembly arranged on the long rod member. The plurality of first measurement assemblies are arranged at intervals along the length direction of the long rod member. Each first measurement assembly includes a first image acquisition device and a laser generator. The laser generator is used to splice the images acquired by adjacent first image acquisition devices. The second measurement assembly includes a moving platform and a second image acquisition device arranged on the moving platform. The moving platform is configured to drive the second image acquisition device to slide horizontally at a constant speed relative to the fuel assembly. The second image acquisition device is used to acquire fuel rod spacing images.

[0006] In one embodiment, the second image acquisition device uses a line scan camera, and a grating ruler is set on the moving platform. The line scan camera moves horizontally on the moving platform to acquire a complete image of the fuel rod spacing. The distance the line scan camera moves on the grating ruler establishes a size ratio relationship with the fuel rod spacing, thereby realizing the measurement of the fuel rod spacing.

[0007] In one embodiment, the first measuring component further includes a first sealing shell assembly and an illumination element. The first image acquisition device, the laser generator, and the illumination element are all mounted on the first sealing shell assembly. The first sealing shell assembly has a plurality of insertion holes along its length on one side facing the long rod member. The first image acquisition device, the laser generator, and the illumination element are mounted on the first sealing shell assembly at one end in conjunction with the insertion holes.

[0008] In one embodiment, the second measuring component further includes a second sealing shell assembly, within which a moving platform is disposed. The moving platform drives the second image acquisition device to slide, and a measuring window is provided on the side opposite to the long rod member. Limiting sensors are disposed on both sides of the moving platform to allow the second image acquisition device to slide back and forth relative to the measuring window.

[0009] In one embodiment, the measuring unit further includes an adapter assembly, which includes a third sealing shell assembly and a plurality of cable outlet connectors. The side wall of the third sealing shell assembly is provided with a plurality of connector through holes, and the plurality of cable outlet connectors are inserted through the connector through holes in the third sealing shell assembly.

[0010] In one embodiment, the first sealing shell assembly further includes a sealing cap and a foreign object prevention cap. A first opening is provided on one side of the first sealing shell assembly, and the sealing cap is provided with a plurality of bolts through the first opening. The foreign object prevention cap is provided with up to two bolts on the outside of the sealing cap.

[0011] In one embodiment, the pool wall bracket includes a horizontal bracket and a vertical bracket perpendicular to the horizontal bracket. The horizontal bracket includes two parallel support rods, on which a connecting rail parallel to the nuclear reactor pool wall is mounted. Positioning pins are disposed opposite each other on the connecting rails. The positioning pins cooperate with the long rod member to allow the long rod member to slide back and forth along the support rods on the connecting rails. A downwardly extending vertical bracket is disposed in the middle of the horizontal bracket, and the lower end of the vertical bracket abuts against the nuclear reactor pool wall for positioning and fixing.

[0012] In one embodiment, the measurement system for the fuel assembly further includes a calibration unit configured to have the same shape and dimensions as the fuel assembly to be measured.

[0013] In one embodiment, the calibration unit includes a long pointer, a first calibration component, and a second calibration component. The first calibration component and the second calibration component are connected to each other in a vertical direction. The long pointer is disposed on the upper end face of the first calibration component, and multiple calibration plates are disposed on the first calibration component and the second calibration component.

[0014] In one embodiment, the fuel assembly measurement system further includes a fuel fixing base for fixing the fuel assembly to be measured. The fuel fixing base includes a limiting base plate and a limiting post. The limiting post is disposed on the lower end face of the limiting base plate and the shape of the limiting post is adapted to the grid for fixing the fuel assembly. A limiting plate is disposed opposite to the upper end face of the limiting base plate and the limiting plate is connected to the lower tube seat of the fuel assembly.

[0015] The aforementioned fuel assembly measurement system comprises a measurement unit including a pool wall bracket, a long rod component, a first measurement component, and a second measurement component. The pool wall bracket securely fixes the entire measurement unit to the wall of the spent fuel water pool. The long rod component is used to centrally arrange the first and second measurement components along its length according to the actual measurement requirements of the fuel assembly. The first measurement component includes a first image acquisition device and a laser generator. The laser generator emits continuous laser stripes towards the fuel assembly under test. Since each first image acquisition device can capture images of fuel assemblies containing adjacent laser stripes, adjacent first image acquisition devices can be used to capture images of fuel assemblies. The images acquired by the collection device are stitched together to achieve a panoramic view of the fuel assembly under test. Performance parameters such as fuel assembly length, fuel rod length, distance between fuel rods and upper and lower tube seats, height of upper tube seat compression spring, and nuclear fuel assembly bending are measured and calculated. The second measurement component includes a moving platform and a second image acquisition device mounted on the moving platform. The moving platform drives the second image acquisition device to slide horizontally at a constant speed relative to the fuel assembly under test, allowing for continuous acquisition and processing of complete images of the fuel assembly under test. The horizontal distance of the second image acquisition device can be correlated with the distance between the fuel rods under test, thereby achieving distance measurement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the measurement unit in the fuel assembly measurement system;

[0017] Figure 2 This is a schematic diagram of the calibration unit in the fuel assembly measurement system;

[0018] Figure 3 This is a schematic diagram of the pool wall mount in the fuel assembly measurement system;

[0019] Figure 4This is a schematic diagram of the long rod component in the fuel assembly measurement system.

[0020] Figure 5 This is a schematic diagram of the structure of the first measuring component in the fuel assembly measuring system;

[0021] Figure 6 This is an internal cross-sectional view of the second measuring component in the fuel assembly's measuring system.

[0022] Figure 7 A three-dimensional view of the second measuring component in the fuel assembly measuring system;

[0023] Figure 8 A three-dimensional view of the second measuring component in the fuel assembly measurement system from another perspective;

[0024] Figure 9 This is a schematic diagram of the transfer component in the fuel assembly measurement system;

[0025] Figure 10 A schematic diagram of the fuel fixing base in the fuel assembly measurement system;

[0026] Figure 11 Measurement layout diagram for the fuel assembly measurement system. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein.

[0028] Therefore, those skilled in the art can make similar improvements without departing from the spirit of this application, and thus this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," and "lateral" are used interchangeably.

[0030] "Length", "Width", "Thickness", "Top", "Bottom", "Front", "Back", "Left"

[0031] "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise"

[0032] The orientation or positional relationship indicated by terms such as "counterclockwise," "axial," "radial," and "circumferential" is based on the orientation or positional relationship shown in the attached figure and is only for the convenience of describing this application and simplifying the description, and does not refer to...

[0033] The device or element referred to herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0035] The relative importance or implicitly indicates the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application,

[0036] "Multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly; for example, they can refer to a fixed connection or a detachable connection.

[0038] The connection can be either disassembled or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components.

[0039] The terms are used in this application unless otherwise expressly defined. Those skilled in the art will understand the specific meaning of the terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] See Figure 1 , Figure 5and Figure 6 An embodiment of the present invention provides a measurement system for a fuel assembly, including a measurement unit 1. The measurement unit 1 includes a pool wall bracket 11, a long rod member 12 connected to the pool wall bracket 11, a plurality of first measurement components 13 disposed on the long rod member 12, and at least one second measurement component 14 disposed on the long rod member 12. The plurality of first measurement components 13 are arranged at intervals along the length direction of the long rod member 12. Each first measurement component 13 includes a first image acquisition device 131 and a laser generator 132. The laser generator 132 enables the stitching of images acquired by adjacent first image acquisition devices 131. The second measurement component 14 includes a moving platform 141 and a second image acquisition device 142 disposed on the moving platform 141. The moving platform 141 is configured to drive the second image acquisition device 142 to slide horizontally at a uniform speed relative to the fuel assembly 4. The second image acquisition device 142 is used to acquire images of the fuel rod spacing.

[0043] The measurement unit 1 also includes a controller (not shown in the figure). All the first image acquisition devices 131 and laser generators 132 are electrically connected to the controller. The moving platform 141 and the second image acquisition device 142 are also electrically connected to the controller. The controller is configured to receive image information and process and analyze the data.

[0044] In this fuel assembly measurement system, a pool wall bracket 11 is used to firmly fix the entire measurement unit 1 to the pool wall of the spent fuel pool. A long rod component 12 is used to centrally arrange the first measurement component 13 and the second measurement component 14 along the length of the long rod component 12 according to the actual measurement requirements of the fuel assembly 4. The first measurement component 13 includes a first image acquisition device 131 and a laser generator 132. The laser generator 132 is used to emit continuous laser stripes to the fuel assembly 4 under test. Since each first image acquisition device 131 can capture an image of the fuel assembly 4 containing adjacent laser stripes, the images acquired by adjacent first image acquisition devices 131 are stitched together to achieve a panoramic view of the fuel assembly 4 under test. Multi-dimensional photographic measurements are taken of the irradiated fuel assembly 4 to check the appearance of the nuclear fuel assembly 4. At the same time, performance parameters such as fuel assembly length, fuel rod length, fuel rod to upper and lower tube seat distance, upper tube seat compression spring height, and nuclear fuel assembly bending are measured and calculated.

[0045] The second measurement component 14 includes a moving platform 141 and a second image acquisition device 142 mounted on the moving platform 141. The moving platform 141 drives the second image acquisition device 142 to slide horizontally at a constant speed relative to the fuel assembly 4 under test, so as to continuously acquire and process images of the fuel assembly 4 under test to obtain complete images. The distance that the second image acquisition device 142 moves horizontally can establish a relationship with the spacing of the fuel rods under test, thereby realizing the spacing measurement. A controller is set to receive image information from different image acquisition devices and process and analyze the data.

[0046] See Figure 2 and Figure 11 It should be clarified that before measuring the fuel assembly 4 to be measured, the measurement unit 1 needs to be calibrated by the calibration unit 2 in the measurement system. The calibration unit 2 is configured to have the same shape and size as the fuel assembly 4 to be measured.

[0047] In this embodiment, the calibration unit 2 includes a long pointer 21, a first calibration component 22, and a second calibration component 23. The first calibration component 22 and the second calibration component 23 are connected to each other in the vertical direction. The long pointer 21 is disposed on the upper end face of the first calibration component 22. Multiple calibration plates of standard size (not shown in the figure) are disposed on the first calibration component 22 and the second calibration component 23. The measurement unit 1 acquires the image of the calibration plate and establishes the size ratio relationship between the acquired image and the calibration plate, thus completing the calibration. According to the above calibration process, when the measurement unit 1 performs multi-size measurement, after acquiring the target image of the fuel assembly 4 to be tested, the size of the target fuel assembly 4 to be tested can be calculated according to the pre-calibrated ratio relationship.

[0048] See Figure 3 In some embodiments, the pool wall bracket 11 includes a horizontal bracket 111 and a vertical bracket 112 perpendicular to the horizontal bracket 111. The horizontal bracket 111 includes two parallel support rods 1111. A connecting rail 1112 parallel to the nuclear reactor pool wall is mounted on the support rods 1111. A positioning pin 1113 is disposed opposite to the connecting rail 1112. The positioning pin 1113 cooperates with the long rod member 12 so that the long rod member 12 slides back and forth along the support rod 1111 on the connecting rail 1112. A vertical bracket 112 extending downward is disposed in the middle of the horizontal bracket 111. The lower end of the vertical bracket 112 abuts against the nuclear reactor pool wall for positioning and fixing.

[0049] In this embodiment, the entire pool wall bracket 11 is a welded frame structure. Furthermore, a locking part 1114 is provided at one end of the bracket 1111 close to the pool wall surface, capable of pressing against the pool wall. The locking part 1114 includes a locking plate 1115 vertically disposed on the bracket 1111 and a screw head 1116 disposed opposite to the locking plate 1115. Adjusting the position of the screw head 1116 on the locking plate 1115 securely fixes the pool wall bracket 11 to the pool wall of the spent fuel water tank. Along the direction of the bracket 1111 body, the bracket 1111 away from the locking part 1114 is provided with slide rails adapted to the connecting rail 1112, allowing the connecting rail 1112 to slide back and forth along the bracket 1111, thereby adjusting the distance and position between the entire long rod component 12 and the pool wall. A stop block 1117 is provided at the end of the slide rail to restrict the sliding of the connecting rail 1112 within the fixed range of the bracket 1111. In addition, when the lower end of the vertical bracket 112 abuts against the nuclear reactor pool wall, a reinforcing frame 113 is provided at the lower end of the vertical bracket 112 to improve the support and positioning effect of the vertical bracket 112.

[0050] For further details, please refer to [link / reference]. Figure 1 and Figure 4 The long rod component 12 connected to the pool wall bracket 11 includes a first connecting rod 121, a second connecting rod 122, a first main frame 123, and a second main frame 124, wherein the upper end of the first connecting rod 121 is connected to the connecting rail 1112 of the pool wall bracket 11.

[0051] The first connecting rod 121 and the second connecting rod 122 are connected via a first connecting seat 125; the second connecting rod 122 is connected to the first main frame 123 via a second connecting seat 126; and the first main frame 123 and the second main frame 124 are connected via a third connecting seat 127.

[0052] Specifically, as an extension tool of the measurement system, the main structures of the first main frame 123 and the second main frame 124 are both rectangular tube structures. Multiple mounting holes are provided on the same side of both the first and second main frames 123 and 124 along their length from top to bottom. Various acquisition holes 128, such as short oval holes and long oval holes, are provided on the opposite side of the mounting holes. The acquisition holes 128 are arranged according to the number of the first measurement component 13 and the second measurement component 14 selected in the actual measurement system. When the first measurement component 13 and the second measurement component 14 are installed on the first main frame 123 and the second main frame 124 respectively through bolts and mounting holes, the acquisition holes 128 allow the image acquisition component of the first measurement component 13 to pass through, facilitating image acquisition. In addition, the second main frame 124 also has multiple sets of oppositely arranged connecting post through holes 129 for fixing the second measurement component 14.

[0053] See Figure 5In some embodiments, the first measuring component 13 further includes a first sealing shell component 134 and an illumination component 133. The first image acquisition device 131, the laser generator 132, and the illumination component 133 are all mounted on the first sealing shell component 134. The first sealing shell component 134 has a plurality of insertion holes along its length on the side facing the long rod component 12. The first image acquisition device 131, the laser generator 132, and the illumination component 133 are mounted on the first sealing shell component 134 at one end in conjunction with the insertion holes.

[0054] Furthermore, the first measuring component 13 is configured as a slender rectangular cavity structure with an opening on one side, and five insertion holes are opened from top to bottom on the side facing the first main frame 123 or the second main frame 124. Among them, the two insertion holes near the upper side of the first measuring component 13 are respectively equipped with a laser generator 132 and a first image acquisition device 131, and the other three insertion holes near the lower side are respectively equipped with an illumination element 133, a laser generator 132 and a first image acquisition device 131.

[0055] The laser generator 132 in the first measurement assembly 13 can emit continuous laser stripes, and each image acquisition device can capture images of adjacent laser stripes. Based on this constraint, the laser module can be used to stitch together images acquired by different image acquisition devices to achieve panoramic imaging of the fuel assembly under test. Then, according to the pre-calibrated scale, the performance parameters such as the length of the fuel assembly, the length of the fuel rod, the distance from the fuel rod to the upper and lower tube seats, the height of the upper tube seat compression spring, and the bending of the nuclear fuel assembly 4 are calculated. In addition, a cable outlet connector 152 is installed on the side wall of the first measurement assembly 13 for connecting the cables in the first measurement assembly 13.

[0056] Furthermore, in some embodiments, the first sealing shell assembly 134 further includes a sealing cover 1342 and a foreign object prevention cover 1343. A first opening 1341 is provided on one side of the first sealing shell assembly 1344. The sealing cover 1342 is mounted on the first opening 1341 with multiple bolts. The foreign object prevention cover 1343 is mounted on the outside of the sealing cover 1342 with at most two bolts. By exposing at most two bolts in exchange for exposing multiple bolts, the foreign object prevention function is achieved, improving the airtightness of the first sealing shell assembly 1344.

[0057] See Figure 6 , Figure 7 and Figure 8In some embodiments, the second measuring component 14 further includes a second sealing shell component 143. A moving platform 141 is provided inside the second sealing shell component 143 along the length direction. The moving platform 141 drives the second image acquisition device 142 to slide through gear transmission. A measuring window 1432 is provided on the side opposite to the long rod component 12. Limiting sensing parts 1412 are provided on both sides of the moving platform 141 to allow the second image acquisition device 142 to slide back and forth relative to the measuring window 1432.

[0058] Furthermore, the second sealing shell assembly 143 is configured as a flat rectangular cavity structure with one side open. The opening is equipped with a sealing cover 1342 and a foreign object prevention cover 1343 that are the same as those configured for the first opening 1341, in order to improve the airtightness of the second sealing assembly. This will not be described in detail here.

[0059] A connecting post 1431 adapted to the long rod member 12 is provided on one side of the second sealing shell assembly 143. One end of the connecting post 1431 close to the shell wall has a flange face, and the other end is a stud. The flange face of the connecting post 1431 is connected to the second sealing shell assembly 143 through a threaded blind hole on the shell wall. The stud is connected to the long rod member 12. A measuring window 1432 is provided on the side opposite to the long rod member 12. A light-transmitting plate 1433 is provided in the measuring window 1432. A cover 1434 is provided between the light-transmitting plate 1433 and the measuring window 1432. In this embodiment, the light-transmitting plate 1433 is made of lead glass to allow the second image acquisition device 142 to perform better imaging under conditions of ionizing radiation. The cover 1434 between the light-transmitting plate 1433 and the measuring window 1432 further improves the sealing performance. In addition, a cable outlet connector 152 is provided on the side of the second sealing shell assembly 143 facing the long rod member 12, and a sealing ring is provided between the second sealing shell assembly 143 and the cable outlet connector 152.

[0060] In some embodiments, the second image acquisition device 142 employs a line scan camera, and a grating ruler 1411 is provided on the moving platform 141. The line scan camera moves horizontally on the moving platform 141 to acquire a complete image of the fuel rod spacing. The distance the line scan camera moves on the grating ruler 1411 establishes a size ratio relationship with the fuel rod spacing, thereby realizing the measurement of the fuel rod spacing.

[0061] Specifically, the grating ruler 1411 extends along the length of the moving platform 141. The moving platform 141 is configured with gear transmission to drive the line array camera to move horizontally at a constant speed along its length. Simultaneously, the lens of the line array camera is facing the measurement window 1432 to measure the spacing of the fuel assembly 4 under test. Because the line array camera used in this embodiment produces a "linear" image with an extremely long length but only a few pixels in the width direction, it is very suitable for use in measurement applications, providing a large field of view and high accuracy, enabling precise measurement of the spacing of the entire fuel assembly 4 under test.

[0062] See Figure 9 In some embodiments, the measuring unit 1 further includes an adapter assembly 15, which includes a third sealing shell assembly 151 and multiple cable outlet connectors 152. The side wall of the third sealing shell assembly 151 is provided with multiple connector through holes, and the multiple cable outlet connectors 152 are inserted through the connector through holes of the third sealing shell assembly 151. At the same time, the adapter assembly 15 is also configured as a flat rectangular cavity structure with one open side. The opening is provided with a sealing cover 153 and a foreign object prevention cover 154, which are the same as those configured for the first opening 1341, to improve the airtightness of the adapter assembly 15. This will not be described in detail here.

[0063] In this embodiment, the third sealing shell assembly 151 has four connector through holes arranged from top to bottom on its side wall. Each connector through hole is provided with a connector. The adapter assembly 15 is used to connect and arrange the cables installed in the first measuring assembly 13 and the second measuring assembly 14 of the first main frame 123 and the second main frame 124.

[0064] See Figure 10 In some embodiments, the measurement system for the fuel assembly 4 further includes a fuel fixing base 3 for fixing the fuel assembly 4 to be measured. The fuel fixing base 3 includes a limiting base plate 31 and a limiting post 32. The limiting post 32 is disposed on the lower end face of the limiting base plate 31, and the shape of the limiting post 32 is adapted to the grid for fixing the fuel assembly 4. A limiting clamping plate 33 is disposed opposite to the upper end face of the limiting base plate 31, and the limiting clamping plate 33 is engaged with the lower tube seat of the fuel assembly 4. Specifically, the fuel fixing base 3 is provided to fix the fuel assembly 4 to be measured, to prevent the fuel assembly 4 from shaking during the measurement process, and to further improve the measurement accuracy.

[0065] See Figure 1In one embodiment, both the first main frame 123 and the second main frame 124 have five mounting holes from top to bottom, for a total of ten mounting holes. The first and tenth mounting holes are equipped with adapter components 15, and the remaining mounting holes are equipped with first measuring components 13. On the opposite side where the mounting holes are provided, two types of acquisition holes 128 are provided. One set of first measuring components 13 corresponds to a short oval hole and a long oval hole, so that the laser generator 132 and the first image acquisition device 131 near the upper side of the first measuring component 13 exit from the short oval hole toward the fuel assembly 4 under test, and the illumination element 133, the laser generator 132 and the first image acquisition device 131 near the lower side exit from the long oval hole toward the fuel assembly 4 under test, so as to perform panoramic imaging.

[0066] Two sets of second measuring components 14 are arranged opposite to the side of the second main frame 124 where the first measuring component 13 is installed. Specifically, the two sets are respectively arranged on the connecting post 1431 through holes 129 between the fifth and sixth sets of the first measuring components 13 and between the sixth and seventh sets of the first measuring components 13 on the second main frame 124. With the connecting post 1431 through hole 129, the connecting post 1431 of the second measuring component 14 passes through the second main frame 124 and is then connected and fixed by the screw at the front end of the connecting post 1431 through the nut.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A measurement system for a fuel assembly, characterized in that, The system includes a measurement unit (1), which comprises a pool wall bracket (11), a long rod member (12) connected to the pool wall bracket (11), a plurality of first measurement components (13) disposed on the long rod member (12), and at least one second measurement component (14) disposed on the long rod member (12). The plurality of first measurement components (13) are arranged at intervals along the length direction of the long rod member (12). Each first measurement component (13) includes a first image acquisition device (131) and a laser generator (132). The laser generator (132) enables the stitching of images acquired by adjacent first image acquisition devices (131). The second measurement component (14) includes a moving platform (141) and a second image acquisition device (142) disposed on the moving platform (141). The moving platform (141) is configured to drive the second image acquisition device (142) to slide horizontally at a uniform speed relative to the fuel assembly (4). The second image acquisition device (142) is used to acquire images of the fuel rod spacing. The second image acquisition device (142) uses a line scan camera. A grating ruler (1411) is set on the moving platform (141). The line scan camera moves horizontally on the moving platform (141) to acquire a complete image of the fuel rod spacing. The distance the line scan camera moves on the grating ruler (1411) establishes a size ratio relationship with the fuel rod spacing, thereby realizing the measurement of the fuel rod spacing. The second measuring component (14) further includes a second sealing shell component (143), in which a moving platform (141) is provided. The moving platform (141) drives the second image acquisition device (142) to slide. A measuring window (1432) is provided on the side of the second sealing shell component (143) away from the long rod component (12). Limiting sensing parts (1412) are provided on both sides of the moving platform (141) to make the second image acquisition device (142) slide back and forth relative to the measuring window (1432). The pool wall bracket (11) includes a horizontal bracket (111) and a vertical bracket (112) perpendicular to the horizontal bracket (111). The horizontal bracket (111) includes two parallel support rods (1111). A connecting rail (1112) parallel to the nuclear reactor pool wall is mounted on the support rod (1111). A positioning pin (1113) is arranged opposite to the connecting rail (1112). The positioning pin (1113) cooperates with the long rod member (12) so that the long rod member (12) slides back and forth along the support rod (1111) on the connecting rail (1112). A downwardly extending vertical bracket (112) is provided in the middle of the horizontal bracket (111). The lower end of the vertical bracket (112) abuts against the nuclear reactor pool wall for positioning and fixing.

2. The measurement system for fuel assemblies according to claim 1, characterized in that, The first measuring component (13) further includes a first sealing shell component (134) and an illumination component (133). The first image acquisition device (131), the laser generator (132) and the illumination component (133) are all mounted on the first sealing shell component (134). The first sealing shell component (134) has a plurality of insertion holes along its length on the side facing the long rod component (12). The first image acquisition device (131), the laser generator (132) and the illumination component (133) are mounted on the first sealing shell component (134) at one end in conjunction with the insertion holes.

3. The measurement system for fuel assemblies according to claim 1, characterized in that, The measuring unit (1) further includes an adapter assembly (15), which includes a third sealing shell assembly (151) and multiple cable outlet connectors (152). The side wall of the third sealing shell assembly (151) is provided with multiple connector through holes, and the multiple cable outlet connectors (152) are inserted into the third sealing shell assembly (151) in cooperation with the connector through holes.

4. The measurement system for fuel assemblies according to claim 2, characterized in that, The first sealing shell assembly (134) further includes a sealing cover (1342) and a foreign object prevention cover (1343). A first opening (1341) is provided on one side of the first sealing shell assembly (134). The sealing cover (1342) is provided with multiple bolts through the first opening (1341). The foreign object prevention cover (1343) is provided with up to two bolts on the outside of the sealing cover (1342).

5. The measurement system for fuel assemblies according to claim 1, characterized in that, The measurement system for the fuel assembly also includes a calibration unit (2) configured to have the same shape and dimensions as the fuel assembly (4) to be measured.

6. The measurement system for fuel assemblies according to claim 5, characterized in that, The calibration unit (2) includes a long rod (21), a first calibration component (22) and a second calibration component (23). The first calibration component (22) and the second calibration component (23) are connected to each other in the vertical direction. The long rod (21) is disposed on the upper end face of the first calibration component (22). Multiple calibration plates are disposed on the first calibration component (22) and the second calibration component (23).

7. The measurement system for fuel assemblies according to claim 1, characterized in that, The measurement system of the fuel assembly (4) also includes a fuel fixing base (3) for fixing the fuel assembly (4) to be measured. The fuel fixing base (3) includes a limiting base plate (31) and a limiting post (32). The limiting post (32) is disposed on the lower end face of the limiting base plate (31), and the limiting post (32) is adapted to the shape of the grid for fixing the fuel assembly (4). A limiting plate (33) is disposed opposite to the upper end face of the limiting base plate (31), and the limiting plate (33) is connected to the lower tube seat of the fuel assembly (4).

Images