Reactor core assembly and method of loading thereof

Abstract

The application relates to the technical field of nuclear reactor engineering, and discloses a reactor core assembly and a loading method thereof. The reactor core assembly comprises an aluminum filler block, a control rod guide tube, a metal assembly and a plurality of positioning bosses. The aluminum filler block defines a loading space. The control rod guide tube and the metal assembly extend along the axial direction of the aluminum filler block and are arranged in the loading space at intervals. The metal assembly is an aluminum assembly or a beryllium assembly. The plurality of positioning bosses are arranged on the inner wall of the aluminum filler block, the outer wall of the control rod guide tube and the outer wall of the metal assembly respectively. The positioning boss located on one side of a group of the metal assemblies is arranged opposite to the positioning boss located on the aluminum filler block, the control rod guide tube or another group of the metal assemblies, and is used for guiding and positioning. The application can improve positioning accuracy, reduce cumulative deviation, improve one-time installation success rate and work efficiency.

Description

Technical Field

[0001] This application belongs to the field of nuclear reactor engineering technology, specifically relating to a reactor core assembly and its loading method. Background Technology

[0002] The reactor core assembly includes fuel assemblies, aluminum assemblies, beryllium assemblies, and control rod guides. Each assembly has a hexagonal profile and is fitted with a small gap between them.

[0003] During reactor refueling, the components lack circumferential positioning capabilities. When relying on the positioning of two adjacent sets of components within the core assembly (e.g., fuel assembly and aluminum assembly), a certain angle of circumferential rotation still exists, which can easily lead to cumulative deviations. This can cause interference between subsequently installed core assemblies and already installed core assemblies, preventing normal installation, resulting in rework, reducing the first-time installation success rate, and decreasing work efficiency. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art.

[0005] Therefore, the first aspect of this application provides a reactor core assembly.

[0006] A second aspect of this application provides a method for loading reactor core assemblies.

[0007] In view of the above, according to a first aspect of the embodiments of this application, a reactor core assembly is provided, comprising: an aluminum packing block defining a loading space; control rod guides and metal assemblies extending axially along the aluminum packing block and spaced apart within the loading space, wherein the metal assemblies are aluminum assemblies or beryllium assemblies; and a plurality of positioning bosses respectively disposed on the inner wall of the aluminum packing block, the outer wall of the control rod guides, and the outer wall of the metal assemblies; wherein a positioning boss located on one side of a group of metal assemblies is disposed opposite to an adjacent positioning boss located on the aluminum packing block, the control rod guides, or another group of metal assemblies, for guiding and positioning.

[0008] In one feasible implementation, the positioning boss includes: a positioning surface located on the side of the positioning boss away from the aluminum filler, the control rod guide tube, or the metal component, with a gap between the positioning surfaces of the opposing positioning bosses; a first guide surface inclined above the positioning surface; and a second guide surface inclined below the positioning surface; wherein, along a direction away from the aluminum filler, the control rod guide tube, or the metal component, the first guide surface extends inclined downward, and the second guide surface extends inclined upward.

[0009] In one feasible implementation, the reactor core assembly further includes: a fuel assembly extending axially along the aluminum packing block and disposed within the loading space, including a positioning post corresponding to the positioning boss; wherein, when one of the positioning posts is adjacent to the positioning boss or another positioning post, there is a gap between one positioning post and the adjacent positioning boss or another positioning post.

[0010] In one feasible implementation, the control rod conduit, the metal assembly, and the fuel assembly each include a hexagonal profile segment; wherein at least one positioning boss is provided on the outer wall of each side of the hexagonal profile segment of the control rod conduit and the metal assembly.

[0011] In one feasible implementation, the reactor core assembly further includes: a grid plate disposed on one side of the aluminum packing block along its axial direction, comprising grid holes and positioning grooves, wherein a portion of the grid holes are connected to a plurality of positioning grooves in a one-to-one correspondence; a positioning pin disposed on the outer wall of the control rod guide tube; one end of the control rod guide tube and the metal assembly are inserted into the corresponding grid holes, wherein the positioning pin cooperates with the positioning groove to perform circumferential positioning of the control rod guide tube.

[0012] According to a second aspect of the embodiments of this application, a method for loading a reactor core assembly is provided. The reactor core assembly includes a grid plate having a plurality of grid holes, wherein the plurality of grid holes are divided into a plurality of rows and a plurality of columns arranged in an intersecting manner. The loading method includes the following steps:

[0013] Obtain the target grid hole for mounting the control rod conduit, and determine the starting and ending number of rows for mounting the metal components;

[0014] The control rod guide is installed into the target cell hole according to the target cell hole;

[0015] Based on the starting row number and the ending row number, start installing the metal components from the first column of the starting row number, install the metal components to the grid holes of each row between the starting row number and the ending row number, until the last column of the ending row number is installed;

[0016] Install the metal components into the remaining grid holes of the grid plate;

[0017] The metal component is either an aluminum component or a beryllium component.

[0018] In one feasible implementation, the loading method also includes:

[0019] Obtain a placeholder gate hole, at least a portion of the placeholder gate holes having the metal component installed;

[0020] When the periphery of one of the occupier holes is only adjacent to other occupier holes, firstly, a portion of the metal components at the occupier holes are extracted to form an empty occupier hole; then, a shift occupier hole is obtained, and the metal components at the shift occupier hole are used as shift metal components and shifted to the empty occupier hole; finally, the remaining metal components at the occupier holes are extracted to form an empty occupier hole.

[0021] When at least one side of a vacant gate hole is adjacent to the metal component or the control rod guide or aluminum filler, the metal components at multiple vacant gate holes are extracted to form empty gate holes.

[0022] In one feasible implementation, the reactor core assembly includes a fuel assembly, and the loading method further includes:

[0023] When the displacement metal assembly is provided in some of the empty grid cells, a portion of the fuel assembly is first installed into the remaining empty grid cells; then the displacement metal assembly is moved back into the displacement grid cells, and another portion of the fuel assembly is installed into that portion of the empty grid cells.

[0024] When the displacement metal assembly is not provided in any of the vacant grid holes, the fuel assembly is installed into the vacant grid holes.

[0025] In one feasible implementation, the steps of determining the starting and ending number of rows for mounting the metal components include:

[0026] Determine the target row number where the target gate hole is located based on the target gate hole;

[0027] Select the target rows located at both ends according to the arrangement order of the multiple target rows;

[0028] Obtain the number of target gate holes in each of the target rows located at both ends;

[0029] The starting row number and the ending row number are determined based on the number of target gate holes;

[0030] Wherein, the target row with the smaller number of target gate holes is the starting row, and the other target row is the ending row.

[0031] In one feasible implementation, the reactor core assembly includes aluminum filler blocks, and the step of mounting the metal assembly to the remaining grid holes of the grid plate includes:

[0032] Obtain the first sequence gate aperture and the second sequence gate aperture;

[0033] The metal assembly is installed into the first sequence gate hole according to the first sequence gate hole;

[0034] The metal assembly is installed into the second sequence gate hole according to the second sequence gate hole;

[0035] The first sequence gate hole includes the gate hole adjacent to the aluminum filler in the remaining gate holes, and the second sequence gate hole includes the gate holes other than the first sequence gate hole in the remaining gate holes.

[0036] The reactor core assembly and its loading method provided in this application can achieve at least the following technical effects:

[0037] In this application, an aluminum filler block defines a loading space, providing space for the installation of the control rod guide, aluminum components, and beryllium components. The control rod guide and metal components extend axially along the aluminum filler block and are spaced apart within the loading space, achieving a spaced arrangement of the control rod guide and metal components within the loading space. Multiple positioning bosses are respectively provided on the inner wall of the aluminum filler block, the outer wall of the control rod guide, and the outer wall of the metal components, used for installation positioning between the aluminum filler block, control rod guide, and metal components. By having a positioning boss located on one side of a group of metal components opposite to an adjacent positioning boss located on the aluminum filler block, control rod guide, or another group of metal components, installation guidance and positioning between a group of metal components and adjacent aluminum filler blocks, control rod guides, or another group of metal components are achieved, improving positioning accuracy, reducing cumulative deviation, increasing the first-time installation success rate, and thus improving work efficiency.

[0038] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0039] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0040] Figure 1 A top view of the core assembly provided in an embodiment of this disclosure;

[0041] Figure 2 This is a schematic diagram showing the arrangement of aluminum filler blocks and grid plates according to an embodiment of the present disclosure;

[0042] Figure 3 for Figure 2 The illustrated embodiment provides a top view of the structure.

[0043] Figure 4 This is a schematic diagram of the structure of the control rod conduit provided in an embodiment of this disclosure;

[0044] Figure 5 for Figure 4 Enlarged diagram at point N;

[0045] Figure 6 This is a schematic diagram of the structure of the aluminum component provided in the embodiments of this disclosure;

[0046] Figure 7 This is a schematic diagram of the structure of a fuel assembly provided in an embodiment of this disclosure;

[0047] Figure 8 A top view schematic diagram of the assembly of multiple aluminum components provided in an embodiment of this disclosure;

[0048] Figure 9 A top view schematic diagram of the aluminum assembly and fuel assembly provided in an embodiment of this disclosure;

[0049] Figure 10 A top view schematic diagram of the assembly of multiple fuel assemblies provided in an embodiment of this disclosure;

[0050] Figure 11 Structural diagram of the core assembly loading process provided in the embodiments of this disclosure. Figure 1 ;

[0051] Figure 12 Structural diagram of the core assembly loading process provided in the embodiments of this disclosure. Figure 2 ;

[0052] Figure 13 Structural diagram of the core assembly loading process provided in the embodiments of this disclosure. Figure 3 ;

[0053] Figure 14 Structural diagram of the core assembly loading process provided in the embodiments of this disclosure. Figure 4 ;

[0054] Figure 15 Structural diagram of the core assembly loading process provided in the embodiments of this disclosure. Figure 5 ;

[0055] Figure 16 A schematic diagram of the structure of the testing tool provided in the embodiments of this disclosure;

[0056] Figure 17 This is a schematic diagram of the structure during the core assembly verification test provided in the embodiments of this disclosure;

[0057] Figure 18 A schematic diagram illustrating the accumulation of errors when fuel assemblies are mated, as provided in an embodiment of this disclosure;

[0058] Figure 19A flowchart is provided for a method of loading reactor core assemblies according to an embodiment of this disclosure;

[0059] Figure 20 A flowchart of a method for loading reactor core assemblies is provided for another embodiment of this disclosure;

[0060] Figure 21 A flowchart of a method for loading reactor core assemblies is provided for yet another embodiment of this disclosure.

[0061] The reference numerals in the attached figures are as follows:

[0062] 100: Core assembly;

[0063] 10: Aluminum filler block; 11: Loading space; 12: Positioning surface; 20: Control rod guide tube; 21: Positioning pin; 30: Aluminum assembly; 40: Positioning boss; 41: Positioning surface; 42: First guide surface; 43: Second guide surface; 50: Fuel assembly; 51: Positioning post; 60: Hexagonal profile segment; 70: Grid plate; 71: Grid hole; 72: Positioning groove; 80: Connecting post; 90: Beryllium assembly;

[0064] 200: Testing tools. Detailed Implementation

[0065] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0066] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0067] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0068] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0069] Unless otherwise stated, the term "multiple" means two or more.

[0070] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0071] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0072] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0073] According to a first aspect of the embodiments of this application, in conjunction with Figures 1 to 15 As shown, a reactor core assembly 100 is provided, including an aluminum packing block 10, control rod guides 20, metal assemblies, and a plurality of positioning bosses 40. The aluminum packing block 10 defines a loading space 11. The control rod guides 20 and the metal assemblies extend axially along the aluminum packing block 10 and are spaced apart within the loading space 11. The metal assemblies are either aluminum assemblies 30 or beryllium assemblies 90. The plurality of positioning bosses 40 are respectively disposed on the inner wall of the aluminum packing block 10, the outer wall of the control rod guides 20, and the outer wall of the metal assemblies. Among them, the positioning bosses 40 located on one side of a group of metal assemblies are disposed opposite to the adjacent positioning bosses 40 located on the aluminum packing block 10, the control rod guides 20, or another group of metal assemblies, for guidance and positioning.

[0074] It should be noted that, Figure 1 In the diagram, Al represents the aluminum assembly, Be represents the beryllium assembly, P represents the control rod guide tube, BF3 represents the neutron detector and guide tube, black dots represent the target, and black rings represent fuel assembly 5. In other figures, Al, Be, P, BF3, black dots, and black rings represent the same information and will not be repeated.

[0075] Combination Figure 2 As shown, an aluminum filler block 10 defines a loading space 11, providing space for the installation of the control rod conduit 20, aluminum assembly 30, and beryllium assembly 90. The control rod conduit 20, aluminum assembly 30, and beryllium assembly 90 extend axially along the aluminum filler block 10; that is, the length direction of the control rod conduit 20, aluminum assembly 30, and beryllium assembly 90 is all along the axial direction of the aluminum filler block 10. In the radial direction, gaps exist between the control rod conduit 20, aluminum assembly 30, and beryllium assembly 90 to allow the control rod conduit 20 and the metal assemblies to be arranged at intervals within the loading space 11.

[0076] In this embodiment, the metal component is an aluminum component 30 or a beryllium component 90. The aluminum component 30 and the beryllium component 90 have the same external contour structure. The material and internal structure of the aluminum component 30 and the beryllium component 90 can be referred to in the related art.

[0077] Multiple positioning bosses 40 are respectively disposed on the inner wall of the aluminum filler block 10, the outer wall of the control rod guide tube 20, and the outer wall of the metal assembly. That is, the multiple positioning bosses 40 can be divided into three parts, wherein the first part of the positioning bosses 40 is disposed on the inner wall of the aluminum filler block 10, the second part of the positioning bosses 40 is disposed on the outer wall of the control rod guide tube 20, and the third part of the positioning bosses 40 is disposed on the outer wall of the metal assembly.

[0078] Combination Figure 2 , Figure 3 , Figure 8 and Figure 9As shown, by positioning a boss 40 located on one side of a group of metal components and positioning a boss 40 located on an adjacent group of aluminum filler blocks 10, control rod guides 20, or another group of metal components, installation guidance and circumferential positioning between one side of a group of metal components and the adjacent aluminum filler blocks 10, control rod guides 20, or another group of metal components are achieved. This improves positioning accuracy, reduces cumulative deviation, increases the first-time installation success rate, and thus improves work efficiency. For the loading of the core assembly 100, the first-time installation success rate is crucial, especially during underwater installation, which involves remote installation due to radiation. If the first installation fails (resulting in jamming, interference, etc.), rework is required, resulting in a huge workload and potential damage to the components, as well as affecting worker safety. The embodiments of this application effectively improve the first-time success rate.

[0079] For example, the positioning boss 40 on one side of the aluminum component 30 is positioned opposite to the adjacent positioning boss 40 on the aluminum filler block 10, so as to guide and circumferentially position the aluminum component 30 relative to the aluminum filler block 10, improve positioning accuracy, reduce cumulative deviation, increase the success rate of installation on the first attempt, and thus improve work efficiency.

[0080] For example, the positioning boss 40 on one side of the beryllium assembly 90 is positioned opposite to the adjacent positioning boss 40 on the control rod guide tube 20, so as to guide and circumferentially position the relative position of the beryllium assembly 90 and the control rod guide tube 20, improve positioning accuracy, reduce cumulative deviation, increase the success rate of installation on the first attempt, and thus improve work efficiency.

[0081] Because the control rod guides 20 and metal components are arranged at intervals within the loading space 11, different circumferential sides of the metal components can be adjacent to different positions of the aluminum filler block 10, different control rod guides 20, or different metal components, and are positioned by the relatively positioned positioning bosses 40. Positioning can be achieved through multiple circumferential sides of the metal components (e.g., six sides), improving the positioning accuracy between the metal components and adjacent components and increasing the success rate of first-time installation. The positioning and mating method between the control rod guides 20 and adjacent components is basically the same as that of the metal components, and will not be described further here.

[0082] In this embodiment, there are multiple control rod guide tubes 20, aluminum components 30, and beryllium components 90, and the specific number is not limited, depending on actual needs. The number of circumferential mounting and positioning bosses 40 on the control rod guide tubes 20, aluminum components 30, and beryllium components 90 is not limited; they are sufficient to achieve positioning and engagement with adjacent components.

[0083] In one feasible implementation, combining Figure 2 and Figure 3As shown, the aluminum filler block 10 includes a plurality of positioning surfaces 12. Each positioning surface 12 is provided with at least one positioning boss 40. The length direction of the positioning surface 12 extends along the axial direction of the aluminum filler block 10. The plurality of positioning surfaces 12 are arranged circumferentially along the aluminum filler block 10, enclosing a loading space 11. There is an included angle between two adjacent positioning surfaces 12, so that the positioning boss 40 of each positioning surface 12 can smoothly cooperate with the adjacent positioning boss 40 located on the metal component, guiding and positioning the metal component relative to the aluminum filler block 10, thereby improving positioning accuracy.

[0084] During the loading of the core assembly 100, the position of the aluminum filler block 10 is fixed to provide a stable loading space 11 and improve positioning accuracy.

[0085] In some embodiments, combined with Figure 4 and Figure 5 As shown, the positioning boss 40 includes a positioning surface 41, a first guide surface 42, and a second guide surface 43. The positioning surface 41 is located on the side of the positioning boss 40 away from the aluminum filler block 10, the control rod guide tube 20, or the metal assembly, and there is a gap between the positioning surfaces 41 of the opposing positioning bosses 40. The first guide surface 42 is inclined above the positioning surface 41 and extends inclined downward along a direction away from the aluminum filler block 10, the control rod guide tube 20, or the metal assembly. The second guide surface 43 is inclined below the positioning surface 41 and extends inclined upward along a direction away from the aluminum filler block 10, the control rod guide tube 20, or the metal assembly.

[0086] The positioning surface 41 is located on the side of the positioning boss 40 facing away from the aluminum filler block 10, the control rod guide tube 20, or the metal assembly, so that the positioning surface 41 of the positioning boss 40 located on one side of a group of metal assemblies is opposite to the positioning surface 41 of the adjacent positioning boss 40 located on the aluminum filler block 10, the control rod guide tube 20, or another group of metal assemblies. A gap exists between the positioning surfaces 41 of the positioning bosses 40 arranged in this opposite manner, providing leeway for adjusting the position of adjacent components, improving positioning accuracy and installation efficiency, and reducing the risk of scratching components during installation.

[0087] Combination Figure 4 and Figure 5 As shown, the first guide surface 42 is inclined above the positioning surface 41 and extends downwards in a direction away from the aluminum filler block 10, the control rod guide tube 20, or the metal component, thus providing installation guidance. The second guide surface 43 is inclined below the positioning surface 41 and extends upwards in a direction away from the aluminum filler block 10, the control rod guide tube 20, or the metal component, thus providing installation guidance.

[0088] In practical applications, the control rod guide tube 20 and the metal assembly are installed into the loading space 11 of the aluminum filler block 10 from top to bottom. Guiding is achieved through the cooperation of the first guide surface 42 and the second guide surface 43. For example, during installation, in the two positioning bosses 40 located in two adjacent components, the second guide surface 43 of one positioning boss 40 moves downward along the first guide surface 42 of the other positioning boss 40 until the positioning surfaces 41 of the two positioning bosses 40 are positioned opposite each other, thus achieving guidance and positioning.

[0089] The tilt angles of the first guide surface 42 and the second guide surface 43 relative to the positioning surface 41 are not limited and can be designed as needed.

[0090] In one possible implementation, the gap between the relatively positioned positioning bosses 40 is 0.2mm to 0.4mm, which provides leeway for position adjustment of the two adjacent components and improves installation positioning accuracy.

[0091] By using a gap width of 0.2mm to 0.4mm between two opposing positioning surfaces 41, the included angle between two adjacent components can be less than or equal to 5°, improving installation positioning accuracy. When the control rod guide 20, metal assembly, and fuel assembly 50 each include a hexagonal profile segment 60, the included angle between two adjacent components refers to the included angle between adjacent sides of the two components on the radial cross-section obtained by radially cutting the hexagonal profile segments 60 of the two adjacent components. For example, Figure 9 The α in the figure is used to indicate the angle between adjacent fuel assembly 50 and aluminum assembly 30, and α is less than or equal to 5°.

[0092] In one possible implementation, the width of the gap between the positioning surfaces 41 of the opposing positioning bosses 40 is 0.2 mm, 0.3 mm, or 0.4 mm.

[0093] In some embodiments, combined with Figure 1 , Figure 7 , Figure 9 and Figure 10 As shown, the reactor core assembly 100 also includes a fuel assembly 50. The fuel assembly 50 extends axially along the aluminum packing block 10 and is disposed within the loading space 11. The fuel assembly 50 includes a positioning post 51 corresponding to a positioning boss 40. When one positioning post 51 is adjacent to a positioning boss 40 or another positioning post 51, there is a gap between the positioning post 51 and the adjacent positioning boss 40 or another positioning post 51.

[0094] The fuel assembly 50 extends along the axial direction of the aluminum packing block 10 and is disposed within the loading space 11. The fuel assembly 50 may be disposed at intervals from the control rod conduit 20, the metal assembly, or the aluminum packing block 10.

[0095] Combination Figure 9 As shown, when the fuel assembly 50 is adjacent to an assembly with a positioning boss 40, the positioning post 51 is adjacent to the positioning boss 40. Because there is a gap between the adjacent positioning post 51 and the positioning boss 40, the relative position between the fuel assembly 50 and the adjacent assembly can be finely adjusted, and the installation position of the fuel assembly 50 and the adjacent assembly can meet the positioning accuracy requirements.

[0096] Combination Figure 10 As shown, when one fuel assembly 50 is adjacent to another fuel assembly 50, one positioning post 51 is adjacent to another positioning post 51. The gap between two adjacent positioning posts 51 allows for fine-tuning of the relative positions between the two adjacent fuel assemblies 50.

[0097] In some embodiments, combined with Figure 4 , Figure 6 and Figure 7 As shown, the control rod conduit 20, the metal assembly, and the fuel assembly 50 each include a hexagonal profile segment 60. At least one positioning boss 40 is provided on the outer wall of each side of the hexagonal profile segment 60 of the control rod conduit 20 and the metal assembly.

[0098] Structurally, the hexagonal profile segment 60 refers to the radial sections of the control rod conduit 20, the metal assembly, and the fuel assembly 50, respectively, cut along their radial directions to obtain the radial cross sections of the control rod conduit 20, the metal assembly, and the fuel assembly 50. The radial cross sections of the control rod conduit 20, the metal assembly, and the fuel assembly 50 are all hexagonal (for example, they can be regular hexagons).

[0099] It should be noted that the hexagonal outline segment 60 is only used to define part of the external outline of the control rod conduit 20, aluminum assembly 30, beryllium assembly 90 and fuel assembly 50. Other functional structures of the hexagonal outline segment 60 of the control rod conduit 20, aluminum assembly 30, beryllium assembly 90 and fuel assembly 50 can be referred to in the related art.

[0100] Specifically, the hexagonal profile segment 60 of the control rod conduit 20 has six sides, each side having at least one positioning boss 40. The hexagonal profile segment 60 of the metal assembly has six sides, each side having at least one positioning boss 40. The radial cross-section of the positioning post 51 of the fuel assembly 50 is circular, and the radial cross-section of the hexagonal profile segment 60 is hexagonal (e.g., it can be a regular hexagon).

[0101] The positioning post 51 of the fuel assembly 50 corresponds to the positioning boss 40 of the control rod guide 20 and the positioning boss 40 of the metal assembly. The hexagonal contour segment 60 of the control rod guide 20, the hexagonal contour segment 60 of the metal assembly, and the hexagonal contour segment 60 of the fuel assembly 50 roughly correspond to each other. During the positioning and installation of the fuel assembly 50, by rotating the fuel assembly 50 around its own axis, the hexagonal contour segment 60 of the fuel assembly 50 contacts the hexagonal contour segment 60 of the adjacent assembly, achieving circumferential limiting and improving positioning accuracy.

[0102] In one possible implementation, combining Figure 9 As shown, the width of the gap between adjacent positioning posts 51 and positioning bosses 40 is 0.2mm to 0.4mm (for example, it can be 0.2mm, 0.3mm or 0.4mm), which can make the included angle (α) between fuel assembly 50 and adjacent components (with positioning bosses 40) less than or equal to 5°. This can provide a margin for position adjustment between fuel assembly 50 and adjacent components and improve installation positioning accuracy.

[0103] In one possible implementation, the width of the gap between two adjacent positioning posts 51 is 0.2 mm to 0.4 mm (for example, it can be 0.2 mm, 0.3 mm or 0.4 mm), which can make the included angle between two adjacent fuel assemblies 50 less than or equal to 5°, which can provide a margin for position adjustment between two adjacent fuel assemblies 50 and improve the installation positioning accuracy.

[0104] In some embodiments, combined with Figure 2 and Figure 3 As shown, the reactor core assembly 100 also includes grid plates 70 and positioning pins 21. The grid plates 70 are disposed on one side of the aluminum packing block 10 along its axial direction, and include grid holes 71 and positioning grooves 72. A portion of the grid holes 71 are connected to a corresponding portion of the positioning grooves 72. Positioning pins 21 are disposed on the outer wall of the control rod guide tube 20. One end of the control rod guide tube 20 and the metal assembly is inserted into the corresponding grid hole 71. The positioning pins 21 cooperate with the positioning grooves 72 to circumferentially position the control rod guide tube 20.

[0105] The grid plate 70 is disposed on one side of the aluminum filler block 10 along the axial direction so that the aluminum filler block 10 is located on the grid plate 70, thereby enabling the grid plate 70 to support the control rod guide tube 20 and the metal assembly.

[0106] Some of the multiple grid holes 71 are connected to multiple positioning grooves 72 in a one-to-one correspondence. That is, the grid holes 71 used for inserting the control rod guide tube 20 are connected to the positioning grooves 72. A positioning pin 21 is provided on the outer wall of one end of the control rod guide tube 20. When one end of the control rod guide tube 20 is inserted into the corresponding grid hole 71, the positioning pin 21 (which can be a positioning screw) cooperates with the positioning groove 72 to perform circumferential positioning of the control rod guide tube 20.

[0107] In one feasible implementation, one end of the fuel assembly 50 is inserted into the corresponding grid hole 71, and the grid plate 70 is used to support the fuel assembly 50.

[0108] In one feasible implementation, combining Figure 4 , Figure 6 and Figure 7 As shown, the control rod conduit 20, aluminum assembly 30, beryllium assembly 90, and fuel assembly 50 each include a connecting post 80. The connecting posts 80 of the control rod conduit 20, aluminum assembly 30, beryllium assembly 90, and fuel assembly 50 are respectively inserted into the corresponding grid holes 71 to realize the installation of the control rod conduit 20, aluminum assembly 30, beryllium assembly 90, and fuel assembly 50 in the corresponding grid holes 71.

[0109] In one feasible implementation, combining Figure 1 and Figure 3 As shown, the diameter of the grid hole 71 used to insert the control rod guide 20 is larger than the diameter of the grid hole 71 used to insert the aluminum assembly 30, beryllium assembly 90, and fuel assembly 50. When the diameters of the connecting posts 80 of the control rod guide 20, aluminum assembly 30, beryllium assembly 90, and fuel assembly 50 are the same, the gap between the connecting post 80 of the control rod guide 20 and the corresponding grid hole 71 is larger than the gap between the connecting post 80 of the aluminum assembly 30, beryllium assembly 90, and fuel assembly 50 and the corresponding grid hole 71. This allows for a larger floating distance at the control rod guide 20, reducing the possibility of jamming. A certain amount of spacing compensation can be made in the normal direction of the six sides of the hexagonal contour segment 60 of the control rod guide 20. Furthermore, the positioning pin 21 of the control rod guide 20 cooperates with the positioning groove 72 of the grid plate 70, restricting the circumferential rotation of the control rod guide 20. This allows the control rod guide 20 to serve as a testing benchmark for verifying the actual installation of other components.

[0110] This application embodiment considers that during the installation and assembly of components, the superposition of various factors affecting the positioning of each component can lead to interference during installation. The factors affecting the positioning of each component and the positioning accuracy between the components were analyzed. The factors affecting the positioning of each component are shown in Table 1.

[0111] Table 1. Factors affecting positioning when components are assembled.

[0112]

[0113] (1) When metal components (aluminum component 30 or beryllium component 90) are mated, as shown in Table 1, the factors affecting the positioning between metal components include the gap between the connecting post 80 of the two sets of metal components and the corresponding grid hole 71, as well as the machining tolerances of the metal components and the grid hole 71. In this embodiment, combined with Figure 8 As shown, the two sets of metal components are guided and positioned by positioning bosses 40, and the installation accuracy is improved by the gap between the two positioning bosses 40 being 0.2mm to 0.4mm. During installation, the connecting post 80 of the metal component first enters the corresponding grid hole 71 to locate the grid cell position within the stack, and then slowly descends until the two positioning bosses 40 contact and guide it until it is installed on the grid plate 70. Throughout the installation process, the connecting post 80 and the grid hole 71 of the metal component are in clearance fit, and the connecting post 80 can deflect relative to the grid hole 71 to achieve fine adjustment of the relative position between the two metal components. Of course, during the processing of the metal components, form and position errors should be minimized as much as possible. After processing, the metal components are debugged and verified to improve installation accuracy and efficiency.

[0114] (2) When the metal component mates with the aluminum filler block 10, as shown in Table 1, the factors affecting the positioning between the metal component and the aluminum filler block 10 include the gap between the connecting post 80 of the metal component and the corresponding grid hole 71, as well as the machining tolerances of the aluminum filler block 10, the metal component, and the grid hole 71. In this embodiment, the aluminum filler block 10 is fixed by itself, giving it high positioning accuracy. Installing the metal component based on the positioning of the aluminum filler block 10 improves the installation positioning accuracy. This results in a higher mating accuracy between the metal component and the aluminum filler block 10 compared to the mating accuracy between metal components.

[0115] (3) When the metal component mates with the control rod guide 20, as shown in Table 1, the factors affecting the positioning between the metal component and the control rod guide 20 include the gaps between the connecting post 80 of the control rod guide 20 and the corresponding grid hole 71, and the machining tolerances of the control rod guide 20, the metal component, and the grid hole 71. In this embodiment, by making the diameter of the grid hole 71 used for inserting the control rod guide 20 larger than the diameter of the grid hole 71 used for inserting the aluminum component 30, the beryllium component 90, and the fuel component 50, the gap between the connecting post 80 of the control rod guide 20 and the corresponding grid hole 71 is larger than the gap between the aluminum component 30, the beryllium component 90, and the fuel component 50 and the corresponding grid hole 71. This results in a larger floating distance at the control rod guide 20, reducing the likelihood of jamming. Furthermore, certain spacing compensation is applied to the normal directions of the six sides of the control rod guide 20. Simultaneously, the positioning pin 21 of the control rod guide 20 engages with the positioning groove 72 of the grid plate 70, restricting the circumferential rotation of the control rod guide 20. This allows the control rod guide 20 to be used to verify the actual installation status of other components.

[0116] (4) When fuel assemblies 50 are fitted together, as shown in Table 1, the factors affecting the positioning between fuel assemblies 50 include the ability of each fuel assembly 50 to rotate around its own axis, the gap between the connecting post 80 of the two sets of fuel assemblies 50 and the corresponding grid hole 71, and the machining tolerances of the fuel assembly 50 and the grid hole 71. In this embodiment, the outer surface of the positioning post 51 is cylindrical, and the radial cross-section of the positioning post 51 is circular. After the fuel assembly 50 is installed in the grid hole 71, the positioning posts 51 of the two fuel assemblies 50 can rotate around their own axes, and circumferential positioning is performed based on the contact of the hexagonal contour segments 60 of the two fuel assemblies 50. It can be seen that the ability of the fuel assembly 50 to rotate around its own axis has a much greater impact on the positioning accuracy than the impact caused by the form and position tolerances. When the fuel assembly 50 is not used as a positioning reference, by making the gap between two adjacent positioning posts 51 0.2 mm to 0.4 mm, the included angle between two adjacent fuel assemblies 50 can be less than or equal to 5°, thereby improving the installation accuracy. Based on the above analysis, fuel assembly 50 is not suitable as a positioning reference for core assembly 100 installation. Figure 18 As shown, α1 indicates the angle between the fuel assembly 50 and the aluminum filler block 10, and α1 is less than or equal to 5°. α2 indicates the angle between the fuel assemblies 50 and 50 after error accumulation, and α2 is greater than 5° (for example, it could be 8°). Accumulated installation errors will cause interference between the fuel assemblies 50 in the last row of the same unit and the aluminum filler block 10. Figure 18The "M" in the diagram indicates the interference position, and the fuel assembly 50 cannot be inserted into the grid hole 71. In other words, without the metal component or aluminum filler block 10, the fuel assembly 50 cannot be used as a standby base alone to avoid accumulated deviations that prevent installation. Therefore, in this embodiment, the control rod guide 20 and the metal component are installed first, with the metal component serving as a placeholder. After the control rod guide 20 and the metal component are installed, the metal component used for placement is removed, and then the fuel assembly 50 is installed to improve installation accuracy and the success rate of a single loading attempt.

[0117] (5) When the metal component and the fuel component 50 are fitted together, as shown in Table 1, the factors affecting the positioning between the metal component and the fuel component 50 include the ability of the fuel component 50 to rotate around its own axis, the gaps between the connecting posts 80 of the fuel component 50 and the corresponding grid holes 71, and the machining tolerances of the fuel component 50, the metal component, and the grid holes 71. In this embodiment, combined with Figure 9 As shown, fuel assembly 50 is installed underwater and can rotate around its own axis. After the hexagonal profile segment 60 of fuel assembly 50 contacts the hexagonal profile segment 60 of the metal assembly, it can no longer rotate. At this point, the included angle (α) between fuel assembly 50 and the metal assembly is less than or equal to 5°. The included angle between fuel assembly 50 and the metal assembly refers to the angle between adjacent sides of the fuel assembly 50 and the metal assembly on the radial cross-section of the hexagonal profile segment 60 of the fuel assembly 50 and the hexagonal profile segment 60 of the metal assembly. Considering the form and position tolerances of the components and the assembly tolerances of their mating, the positioning accuracy of the combination of fuel assembly 50 and the metal assembly is less than the positioning accuracy of the mating of two metal assemblies.

[0118] (6) When the fuel assembly 50 and the control rod conduit 20 are engaged, as shown in Table 1, the factors affecting the positioning between the fuel assembly 50 and the control rod conduit 20 include the ability of the fuel assembly 50 to rotate around its own axis, the gaps between the connecting post 80 of the fuel assembly 50 and the control rod conduit 20 and their corresponding grid holes 71, and the machining tolerances of the fuel assembly 50, the control rod conduit 20, and the grid holes 71. In this embodiment, when the fuel assembly 50 is installed and positioned according to the control rod conduit 20, the fuel assembly 50 can rotate around its own axis. After the hexagonal profile segment 60 of the fuel assembly 50 rotates to contact the hexagonal profile segment 60 of the control rod conduit 20, it can no longer rotate. At this time, the included angle between the fuel assembly 50 and the control rod conduit 20 is less than or equal to 5°. The included angle between the fuel assembly 50 and the control rod conduit 20 refers to the angle between adjacent sides of the fuel assembly 50 and the control rod conduit 20 on the radial cross-section of the hexagonal profile segment 60 of the fuel assembly 50 and the hexagonal profile segment 60 of the control rod conduit 20.

[0119] (7) When the fuel assembly 50 mates with the aluminum packing block 10, as shown in Table 1, the factors affecting the positioning between the fuel assembly 50 and the aluminum packing block 10 include the ability of the fuel assembly 50 to rotate around its own axis, the gap between the connecting post 80 of the fuel assembly 50 and the corresponding grid hole 71, and the machining tolerances of the aluminum packing block 10, the fuel assembly 50, and the grid hole 71. The fuel assembly 50 can be installed by fixing it itself with the aluminum packing block 10, thereby improving the installation positioning accuracy. In the first furnace loading, the mating of the fuel assembly 50 and the aluminum packing block 10 may not be included.

[0120] Based on the structure, positioning design, and fitting data of each component in the core assembly 100, the fitting accuracy of each component from high to low is as follows: metal assembly and aluminum filler block 10, metal assembly and metal assembly, metal assembly and control rod guide tube 20, fuel assembly 50 and aluminum filler block 10, fuel assembly 50 and metal assembly, fuel assembly 50 and control rod guide tube 20, and fuel assembly 50 and fuel assembly 50.

[0121] The component combinations during the first boiler loading include: aluminum assembly 30 and aluminum packing block 10, beryllium assembly 90 and aluminum packing block 10, aluminum assembly 30 and aluminum assembly 30, aluminum assembly 30 and beryllium assembly 90, beryllium assembly 90 and beryllium assembly 90, aluminum assembly 30 and control rod guide 20, beryllium assembly 90 and control rod guide 20, aluminum assembly 30 and fuel assembly 50, beryllium assembly 90 and fuel assembly 50, fuel assembly 50 and control rod guide 20, and fuel assembly 50 and fuel assembly 50.

[0122] Based on the aforementioned precision of the component assembly, according to a second aspect of this application, a method for loading a reactor core assembly 100 is provided, applicable to the first reactor loading, to improve positioning accuracy, reduce cumulative deviation, and increase the success rate of first-time installation. The reactor core assembly 100 includes a grid plate 70 with multiple grid holes 71, the multiple grid holes 71 being divided into multiple rows and columns arranged in a cross pattern. Combined with... Figure 19 As shown, the loading method includes the following steps:

[0123] S191. Obtain the target grid hole for installing the control rod conduit, and determine the starting and ending row numbers for installing the metal components.

[0124] By acquiring the target grid hole, the location for installing the control rod guide 20 is determined, thereby enabling the loading of the control rod guide 20. By determining the starting and ending row numbers, the distribution area of ​​multiple control rod guides 20 is obtained, providing positional information for installing metal components in that area.

[0125] Multiple control rod guides 20 are inserted one-to-one into multiple target cell holes. The multiple control rod guides 20 are distributed in the central region of the core, making it easy to detect installation deviations of other components (e.g., metal components) early. The control rod guides 20 can serve as a verification benchmark for the loading of other components; therefore, the control rod guides 20 are loaded first.

[0126] Installing metal components starting from the distribution area of ​​multiple control rod guides 20 helps to ensure that the gaps between the components are basically consistent, avoids using the compensation margin of the control rod guides 20 in the grid hole 71 in advance as much as possible, prevents the lack of subsequent compensation margin, reduces cumulative errors, and improves the success rate of first-time loading.

[0127] It should be noted that when the aluminum filler block 10, aluminum assembly 30, beryllium assembly 90, control rod guide 20, and fuel assembly 50 are fitted together, a testing tool can be used to check whether the gaps between adjacent components are flush. During testing, the testing tool is inserted between two adjacent components, extending to the hexagonal contour segment 60. If the surfaces of the two adjacent components contact the testing tool, the gaps between them are essentially flush. If they are not flush, the components can be fine-tuned to make the gaps between adjacent components essentially flush. Using a testing tool ensures that the gaps between the components are basically consistent, improving positioning accuracy.

[0128] The specific structure of the testing tools is not limited. Figure 16 As shown, the test tool 200 can be a plate-like structure, and the thickness of the plate-like structure can be a preset distance between the hexagonal contour segments 60 of two adjacent components. The plate-like structure can also include multiple thickness segments. The thickness of the plate-like structure is different at different thickness segment locations, so that the test tool can be used to detect different gaps.

[0129] A specific example, combined with Figure 1 as well as Figures 11 to 15 As shown, multiple grid holes 71 are divided into alternating rows A, B, C, D, E, F, G, H, and I, and columns 1, 2, 3, 4, 5, 6, 7, 8, and 9. The position of the grid holes 71 can be represented by coordinates (row number, column number). Specifically, (C,4), (E,3), (E,5), (E,7), and (G,6) are used to represent the positions of the target grid holes.

[0130] In some embodiments, the step of determining the starting and ending rows for mounting the metal assembly includes: determining the target row number containing the target gate hole based on the target gate hole; selecting the target rows at both ends according to the order of the multiple target rows; obtaining the number of target gate holes in each target row at both ends; and determining the starting and ending rows based on the number of target gate holes. The target row with the fewer target gate holes is the starting row, and the other target row is the ending row.

[0131] Combination Figure 1 as well as Figures 11 to 15 As shown, the target row number of the target cell aperture can be determined by its position. Target cell aperture (C,4) is located in row C, target cells apertures (E,3), (E,5) and (E,7) are located in row E, and target cell aperture (G,6) is located in row G.

[0132] Combination Figure 1 as well as Figures 11 to 15 As shown, according to the arrangement order of multiple target rows, the target rows at both ends are selected to determine the starting and ending rows. For example, according to the arrangement order of rows C, E, and G, the target rows at both ends are rows C and G, respectively.

[0133] Combination Figure 1 as well as Figures 11 to 15 As shown, the number of target cell holes in each target row located at both ends is obtained. For example, row C and row G each have one target cell hole.

[0134] Combination Figure 1 as well as Figures 11 to 15 As shown, the starting and ending row numbers are determined based on the number of target cell holes. The row with the fewer target cell holes is the starting row number, and the other row is the ending row number. For example, since rows C and G have the same number of target cell holes, either row C or G can be selected as the starting row number, and the other row as the ending row number.

[0135] Starting with the target row number having the fewest target cell holes, the initial row has a relatively small number of control rod guides 20, resulting in less compensation margin. Installing metal components from the initial row improves verification accuracy. Furthermore, starting the installation of metal components from the row containing the control rod guides 20 helps ensure that the gaps between components are basically consistent, minimizing the premature use of the compensation margin of the control rod guides 20 within the cell holes 71, and preventing situations where there is no margin left for subsequent compensation.

[0136] S192. Install the control rod guide tube to the target cell hole according to the target cell hole.

[0137] The control rod guide 20 is loaded by mounting it to the target cell hole, providing a verification benchmark for the loading accuracy of other components.

[0138] Combination Figure 1 as well as Figures 11 to 15 As shown, control rod guide tubes 20 are installed at the target cell holes (C,4), (E,3), (E,5), (E,7) and (G,6), respectively.

[0139] S193. Based on the starting row number and the ending row number, install the metal components starting from the first column of the starting row number, and install the metal components to the grid holes of each row between the starting row number and the ending row number until the last column of the ending row number is installed.

[0140] Installing metal components starting from the first column of the initial row improves verification accuracy. The metal components are then installed into the cell holes 71 of each row between the initial and final rows, continuing until the last column of the final row is completed. In other words, installing the metal components first in the area containing the multiple control rod guides 20 helps ensure that the gaps between components are essentially consistent, minimizing the use of the compensation margin in the cell holes 71 of the control rod guides 20 beforehand, and preventing a lack of subsequent compensation margin, thus improving the initial power output during loading.

[0141] For a specific example, the filling can be carried out according to the positions marked on the first furnace loading diagram for aluminum components 30 and beryllium components 90. When the starting row is row C, start installing the metal components from (C,1). During the installation and filling process, the gaps between adjacent metal components should be as even as possible. When the metal component is installed at (C,3), it is adjacent to the control rod guide tube 20 at (C,4). The test tool 200 can be used to test whether the gaps between the installed components in row C are even. If they are not even, adjust them to be even. After row C is filled, the test tool 200 can be used to test whether the gap between the last group of metal components in row C and the aluminum filler block 10 is even to confirm that there are no abnormalities in the installation. At this point, the positioning and installation of row C is basically completed. Then start installing metal components from (D,1) in row D until row D is completely installed. During the installation of row D, when the metal components are installed adjacent to the control rod guide tube 20, the gaps between the installed components can be checked using the testing tool 200 to ensure they are flush. If any unevenness is found, adjustments should be made promptly to ensure that the gaps between the components are essentially consistent. Following the above method, multiple metal components are installed at (E,1) to (E,9), (F,2) to (F,9), and (G,3) to (G,9), respectively. This achieves the sequential installation of metal components according to the order of row C (with control rod guide tube 20), row D, row E (with control rod guide tube 20), row F, and row G (with control rod guide tube 20).

[0142] S194. Install the metal components into the remaining grid holes of the grid plate.

[0143] Among them, the metal components are aluminum component 30 or beryllium component 90.

[0144] The remaining grid holes of the grid plate 70 refer to the grid holes 71 of the grid plate 70 that are not fitted with metal components and control rod guide tubes 20. The remaining grid holes of the grid plate 70 can be distributed on both sides of the area where the control rod guide tubes 20 are located.

[0145] In this embodiment, the control rod guide 20 is installed first as a verification reference for the loading of other components. Then, metal components are installed in the area where the control rod guide 20 is located, minimizing the use of the compensation margin within the grid hole 71 of the control rod guide 20 in advance and reducing error accumulation. Finally, metal components are installed outside the area where the control rod guide 20 is located. A high-precision positioning reference is installed first, followed by high-precision pairing combinations to reduce positioning errors during component pairing, reduce error accumulation, and improve the first-time loading success rate.

[0146] In some embodiments, combined with Figures 12 to 15 As shown, the reactor core assembly 100 includes aluminum filler blocks 10. The step of installing the metal assembly into the remaining grid holes of the grid plate 70 includes: obtaining a first-sequence grid hole and a second-sequence grid hole; installing the metal assembly into the first-sequence grid hole according to the first-sequence grid hole; and installing the metal assembly into the second-sequence grid hole according to the second-sequence grid hole. The first-sequence grid hole includes the grid hole 71 adjacent to the aluminum filler block 10 among the remaining grid holes, and the second-sequence grid hole includes the grid holes 71 other than the first-sequence grid holes among the remaining grid holes.

[0147] The first sequence of gate holes includes the gate hole 71 adjacent to the aluminum filler block 10 among the remaining gate holes. It has high positioning accuracy and a low possibility of interference. Multiple metal components are first installed into the first sequence of gate holes to improve positioning accuracy and reduce cumulative error.

[0148] The second sequence gate hole includes the gate hole 71 other than the first sequence gate hole among the remaining gate holes. After the metal component at the first sequence gate hole is installed, the metal component at the second sequence gate hole is installed to improve the positioning accuracy of the metal component at the second sequence gate hole and reduce the cumulative error.

[0149] A specific example, such as Figure 12As shown, for rows A and B, the first sequence of grid element holes includes (A,1), (A,2), (A,3), (A,4), (A,5), (B,1), and (B,6). The second sequence of grid element holes includes (B,2), (B,3), (B,4), and (B,5). During installation, metal components are first installed sequentially at (A,1), (A,2), (A,3), (A,4), and (A,5), ensuring that the gaps between the multiple metal components in row A and the aluminum filler block 10 are essentially consistent. Then, metal components are installed at (B,1) and (B,6), completing the installation of metal components at the points with high positioning accuracy on the outer ring (the mating points between the metal components and the aluminum filler block 10). Finally, metal components are installed at (B,2), (B,3), (B,4), and (B,5), completing the installation of the inner metal components. By installing from the outside in, positioning accuracy is improved and cumulative error is reduced. When installing the metal components in row B, the principle is to ensure that they can be easily removed and placed. On the basis of this, the gaps between the components should be kept as consistent as possible.

[0150] Another specific example, such as Figure 13 As shown, for rows H and I, the first sequence of gate element holes includes (I,5), (I,6), (I,7), (I,8), (I,9), (H,4), and (H,9). The second sequence of gate element holes includes (H,5), (H,6), (H,7), and (H,8). During installation, metal components are first installed sequentially at (I,5), (I,6), (I,7), (I,8), and (I,9), ensuring that the gaps between the multiple metal components in row I and the aluminum filler block 10 are essentially consistent. Then, metal components are installed at (H,4) and (H,9) to complete the installation of metal components at the high positioning accuracy points on the outer ring (where the metal components mate with the aluminum filler block 10). Finally, metal components are installed at (H,5), (H,6), (H,7), and (H,8) to complete the installation and positioning of the inner metal components. When installing the metal components of the H-row, the principle is to ensure that they can be easily picked up and placed. On the basis of this, the gaps between the components should be kept as consistent as possible.

[0151] In this embodiment, since some metal components are used to occupy space for the target, neutron detector and conduit, beryllium assembly 90 for extrapolation, and fuel assembly 50, the occupier metal components can be extracted and installed into the H-row during the installation of the metal components in the H-row, completing the sequential filling of the H-row metal components. In this embodiment description, the occupier metal components are described as occupier metal components. The outer contour structure of the target can be the same as the outer contour structure of the fuel assembly 50.

[0152] In some embodiments, a method for loading reactor core assemblies is provided, applied to the first refueling loading. (Combined with...) Figure 20 As shown, the loading method includes the following steps:

[0153] S201. Obtain the target grid hole for installing the control rod conduit, and determine the starting and ending number of rows for installing the metal components.

[0154] S202. Install the control rod guide tube to the target cell hole according to the target cell hole.

[0155] S203. Based on the starting row number and the ending row number, install the metal components starting from the first column of the starting row number, and install the metal components to the grid holes of each row between the starting row number and the ending row number until the last column of the ending row number is installed.

[0156] S204. Install the metal components into the remaining grid holes of the grid plate.

[0157] Among them, the metal components are aluminum component 30 or beryllium component 90.

[0158] S205. Obtain the placeholder gate holes, at least some of which have metal components installed.

[0159] According to the initial loading diagram, some of the grid holes 71 on the grid plate 70 are used to install the target, neutron detector and conduit, beryllium assembly 90 for external push-out, fuel assembly 50, etc. For these grid holes 71, metal components can be inserted first to occupy the space. When installing the target, neutron detector and conduit, beryllium assembly 90 for external push-out, and fuel assembly 50 later, the occupying metal components are first removed to leave empty space before installation. Therefore, the occupying grid holes are the grid holes 71 used for the subsequent installation of the target, neutron detector and conduit, beryllium assembly 90 for external push-out, and fuel assembly 50.

[0160] In multiple vacant grid holes, all metal components have been installed, or some vacant grid holes have become empty because the metal components have been moved to the H row.

[0161] S206. When the periphery of a vacant gate is only adjacent to other vacant gates, first extract part of the metal components at the vacant gate to make the vacant gate form an empty gate; obtain a shift gate, use the metal components at the shift gate as shift metal components, and shift them to the empty gate; then extract the remaining metal components at the vacant gate to form an empty gate.

[0162] The periphery of a single occupant grid hole is adjacent only to other occupant grid holes; that is, occupant grid holes are arranged all around the periphery of a single occupant grid hole. If all the occupant metal components of these occupant grid holes are extracted, multiple empty spaces are created. These empty spaces mean that when the target, neutron detector and guide tube, beryllium assembly 90 for outward push, fuel assembly 50, etc., are subsequently installed into the occupant grid hole located at the center, there are no other components in the circumference for positioning, affecting installation accuracy and efficiency. Therefore, in this embodiment, the metal components at part of the occupant grid holes are extracted first, so that these part of the occupant grid holes form empty grid holes for installing the displacement metal components.

[0163] A void cell hole refers to a cell hole 71 formed by removing the occupant metal component at the occupant cell hole location.

[0164] According to the first furnace loading diagram and the position of the preset shifting grid hole, the shifting metal component is shifted to the formed empty grid hole to provide positioning support for the subsequent installation of target, neutron detector and conduit, beryllium component 90 for external push, fuel component 50, etc., thereby improving installation accuracy and success rate.

[0165] The remaining vacant gate aperture refers to the vacant gate aperture where the vacant metal component has not yet been removed. Removing the metal component at the remaining vacant gate aperture creates an empty gate aperture, which prepares for subsequent target components, neutron detectors and guide tubes, beryllium assembly 90 for extrapolation, fuel assembly 50, etc.

[0166] S207. When at least one side of a vacant grid hole is adjacent to a metal component, control rod guide tube, or aluminum filler, the metal component at the vacant grid hole is removed to form an empty grid hole.

[0167] Since at least one side of a vacant grid hole is adjacent to a metal component, control rod guide 20, or aluminum filler block 10, if the vacant metal components of multiple vacant grid holes are extracted, the adjacent metal component, control rod guide 20, or aluminum filler block 10 can provide positioning support for the subsequent installation of the target, neutron detector and guide, beryllium assembly 90 for extrapolation, fuel assembly 50, etc. By extracting the metal components at multiple vacant grid holes to form empty grid holes, the success rate of loading in one attempt is improved, while loading efficiency is also increased.

[0168] In some embodiments, the reactor core assembly 100 includes a fuel assembly 50. A method for loading the reactor core assembly 100 is provided, applicable to first-boiler loading. Figure 21 As shown, the loading method includes:

[0169] S211. Obtain the target grid hole for installing the control rod conduit, and determine the starting and ending row numbers for installing the metal components.

[0170] S212. Install the control rod guide tube to the target cell hole according to the target cell hole.

[0171] S213. Based on the starting row number and the ending row number, start installing the metal components from the first column of the starting row number, and install the metal components to the grid holes of each row between the starting row number and the ending row number until the last column of the ending row number is installed.

[0172] S214. Install the metal components into the remaining grid holes of the grid plate.

[0173] Among them, the metal components are aluminum component 30 or beryllium component 90.

[0174] S215. Obtain the placeholder gate holes, at least some of which have metal components installed.

[0175] S216. When the periphery of a vacant gate is only adjacent to other vacant gates, first extract part of the metal components at the vacant gate to make the vacant gate form an empty gate; obtain a shift gate, use the metal components at the shift gate as shift metal components, and shift them to the empty gate; then extract the remaining metal components at the vacant gate to form an empty gate.

[0176] S217. When at least one side of a vacant grid hole is adjacent to a metal component, a control rod conduit, or an aluminum filler, the metal components at the vacant grid holes are removed to form empty grid holes.

[0177] S218. When a displacement metal assembly is provided in some empty grid cells, first install a portion of the fuel assembly into the remaining empty grid cells; then move the displacement metal assembly back into the displacement grid cells, and install another portion of the fuel assembly into the empty grid cells.

[0178] The remaining empty grid holes refer to those without any shifting metal assemblies. When installing a portion of the fuel assemblies 50 into these empty grid holes, the shifting metal assemblies are used for positioning, improving installation accuracy and the success rate on the first attempt. The shifting metal assemblies are then moved back into the shifting grid holes, making them available for installing fuel assemblies 50. The remaining fuel assemblies 50 are then installed into these empty grid holes, completing the installation of the fuel assemblies 50 and improving installation accuracy and the success rate on the first attempt.

[0179] S219. When multiple vacancy grid holes are not equipped with displacement metal components, install the fuel assembly into the vacancy grid holes.

[0180] When the fuel assembly 50 is installed into the empty grid cell hole, the metal components and / or control rod guide 20 around the fuel assembly 50 can provide positioning support for the fuel assembly 50, complete the installation of the fuel assembly 50, reduce cumulative errors, improve positioning accuracy, and increase the success rate and efficiency of installation on the first attempt.

[0181] During the first fuel loading, according to the first fuel loading diagram, a predetermined number of beryllium assemblies 90, aluminum assemblies 30, fuel assemblies 50, target components, neutron detectors, and guide tubes are installed at the core to achieve full core loading. The loading method in this embodiment first installs assemblies that can serve as verification benchmarks, and then fills in positions and assemblies with high positioning accuracy, minimizing component positioning errors and cumulative errors. Gaps exist between each assembly to ensure positioning accuracy while avoiding interference between components and preventing scratches caused by overly tight installation. Furthermore, the goal is to achieve the positioning benchmark with the fewest possible assemblies, improving the success rate and efficiency of the first loading, ensuring a smooth, safe, and efficient first fuel loading process.

[0182] In practical applications, without compromising reactor safety, aluminum components 30 can be used to position the fuel assembly 50 around it to enable the normal installation of the fuel assembly 50.

[0183] According to the first furnace loading diagram, core assembly 100 can be installed using specialized tools. The specific tools are not limited, as long as they enable loading. The entity executing the loading method can be a processing device or controller installed on the specialized tool, or it can be a terminal device or cloud processor electrically or communicatively connected to the specialized tool; no specific limitations are imposed.

[0184] In practical applications, the initial loading process can be divided into two stages: dry installation and underwater installation, with the reactor pressure vessel being filled with water as the key point.

[0185] During the dry installation phase, specialized tools are used for loading, which can be assisted by operators, improving the success rate of loading on the first attempt. Steps S211 to S217 constitute dry installation. During the dry installation phase, target components, neutron detectors, and guide tubes can also be installed, bringing the number of dry-installed components to approximately 83% of the total core quantity, further shortening installation time and improving installation efficiency. The control rod guide tube 20, beryllium assembly 90, and aluminum assembly 30 installed during the dry installation phase provide reliable positioning for underwater installation of fuel assemblies 50, beryllium assemblies 90, etc., improving overall positioning accuracy and the success rate of first-time installation.

[0186] During the underwater installation phase, specialized tools are used for remote loading to improve loading safety. Steps S218 and S219 can be used for underwater installation.

[0187] In practical applications, after the core assembly 100 leaves the factory, matching and simulated assembly can be performed to verify the accumulation of errors under manufacturing conditions. Because the aluminum assembly 30 has high positioning accuracy and is easy to detect error accumulation, the aluminum assembly 30 and fuel assembly 50 simulators are used to verify the installation and positioning accuracy of the core assembly 100. During the verification test, if... Figure 17 As shown, at least three adjacent columns of grid holes 71 are first filled with aluminum components 30. Then, aluminum components 30 located in the middle column are randomly selected to form empty spaces, and fuel assembly 50 simulators are installed in these empty spaces. If there is no interference between the components and there are gaps, the aluminum components 30 can be normally placed and removed, and the fuel assembly 50 simulators can be smoothly installed without jamming, then the design requirements are met. This also shows that the gap between the aluminum components 30 and the grid plates 70 has a certain compensation function. During the first fuel loading, the use of aluminum components 30 to occupy space helps to improve the installation and positioning accuracy of the core assembly 100.

[0188] Application example:

[0189] Taking the first reactor core loading as an example, the loading method of this application involved over 730 steps and took a total of 11 days, including 9 days for dry installation and 2 days for underwater installation. No rework occurred during the loading process, and all components were installed on the first attempt, completing the process 15 days ahead of schedule. Furthermore, subsequent underwater operations of over 2000 steps in the test reactor showed no jamming. The loading method of this embodiment improves the accuracy and success rate of the first-time installation of the core assembly 100.

[0190] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A method for loading reactor core assemblies, characterized in that, The reactor core assembly includes a grid plate with multiple grid holes, the multiple grid holes being divided into multiple rows and multiple columns arranged in an alternating manner, and the loading method includes the following steps: Obtain the target grid hole for mounting the control rod conduit, and determine the starting and ending number of rows for mounting the metal components; The control rod guide is installed into the target cell hole according to the target cell hole; Based on the starting row number and the ending row number, start installing the metal components from the first column of the starting row number, install the metal components to the grid holes of each row between the starting row number and the ending row number, until the last column of the ending row number is installed; A metal component is installed into the remaining grid holes of the grid plate; wherein the metal component is an aluminum component or a beryllium component; Obtain a placeholder gate hole, at least a portion of the placeholder gate holes having the metal component installed; When the periphery of one of the occupier holes is only adjacent to other occupier holes, firstly, a portion of the metal components at the occupier holes are extracted to form an empty occupier hole; then, a shift occupier hole is obtained, and the metal components at the shift occupier hole are used as shift metal components and shifted to the empty occupier hole; finally, the remaining metal components at the occupier holes are extracted to form an empty occupier hole. When at least one side of a vacant gate hole is adjacent to the metal component or the control rod guide or aluminum filler, the metal components at multiple vacant gate holes are extracted to form empty gate holes.

2. The loading method according to claim 1, characterized in that, The reactor core assembly includes a fuel assembly, and the loading method further includes: When the displacement metal assembly is provided in some of the empty grid cells, a portion of the fuel assembly is first installed into the remaining empty grid cells; then the displacement metal assembly is moved back into the displacement grid cells, and another portion of the fuel assembly is installed into that portion of the empty grid cells. When the displacement metal assembly is not provided in any of the vacant grid holes, the fuel assembly is installed into the vacant grid holes.

3. The loading method according to claim 1 or 2, characterized in that, The steps for determining the starting and ending number of rows for installing metal components include: Determine the target row number where the target gate hole is located based on the target gate hole; Select the target rows located at both ends according to the arrangement order of the multiple target rows; Obtain the number of target gate holes in each of the target rows located at both ends; The starting row number and the ending row number are determined based on the number of target gate holes; Wherein, the target row with the smaller number of target gate holes is the starting row, and the other target row is the ending row.

4. The loading method according to claim 1 or 2, characterized in that, The steps of mounting the metal components to the remaining grid holes of the grid plate include: Obtain the first sequence gate aperture and the second sequence gate aperture; The metal assembly is installed into the first sequence gate hole according to the first sequence gate hole; The metal assembly is installed into the second sequence gate hole according to the second sequence gate hole; The first sequence gate hole includes the gate hole adjacent to the aluminum filler in the remaining gate holes, and the second sequence gate hole includes the gate holes other than the first sequence gate hole in the remaining gate holes.

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