Splicing fuel assembly structure and reactor core

Abstract

The application discloses a spliced fuel assembly structure and a reactor core, which can connect integrated channels of two fuel assembly bodies through a connecting sleeve, and reduces the leakage problem caused by the flow of coolant between the two fuel assembly bodies. The spliced fuel assembly structure comprises the fuel assembly bodies and the connecting sleeve. The number of the fuel assembly bodies is two; the fuel assembly bodies are internally provided with the integrated channels, the integrated channels are arranged along the axial direction of the fuel assembly bodies, and the integrated channels are used for guiding the coolant; the two fuel assembly bodies are oppositely arranged along the axial direction, and the two fuel assembly bodies are both provided with positioning holes on the two opposite end faces, and the positioning holes are communicated with the integrated channels in the corresponding fuel assembly bodies. The two ends of the connecting sleeve are matched with the two positioning holes, and the two ends of the connecting sleeve are respectively inserted into the two positioning holes; the connecting sleeve is internally provided with a communicating hole, and the communicating hole is communicated with the integrated channels of the two fuel assembly bodies, so that the coolant can flow in the two fuel assembly bodies.

Description

Technical Field

[0001] This invention relates to the field of reactor design technology, and in particular to a spliced ​​fuel assembly structure and a reactor core. Background Technology

[0002] Prismatic high-temperature gas-cooled reactors use graphite as both the structural and moderator material for the reactor core. The core is typically vertically arranged, with an outer perimeter composed of fan-shaped graphite reflectors assembled into a cylindrical structure. The interior of this cylindrical structure is filled with hexagonal prism-shaped graphite fuel assemblies. These fuel assemblies hold the fuel pellets and provide coolant channels. During reactor operation, the heat generated by the fuel pellets is primarily transferred to the outside of the reactor via the coolant.

[0003] like Figure 1 , Figure 2 and Figure 3 As shown, in the traditional graphite fuel assembly design, the fuel channel 1 and the coolant channel 2 are independently distributed and do not interfere with each other.

[0004] Connecting pins and pin holes 3 are arranged on the upper and lower ends of the graphite assembly, respectively. Two axially adjacent graphite assemblies are positioned in series only by a few connecting pins. The coolant flows in the axial direction of the graphite fuel assembly. The coolant flow channel 2 in the core is discontinuous between the two graphite fuel assemblies in the axial direction. The gaseous coolant is prone to leakage, which affects the heat exchange efficiency of the core. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a spliced ​​fuel assembly structure and reactor core, which can connect the integrated channel of two fuel assembly bodies through a connecting sleeve to reduce the leakage problem caused by the coolant flowing between the two fuel assembly bodies.

[0006] In a first aspect, embodiments of the present invention provide a spliced ​​fuel assembly structure, comprising a fuel assembly body and a connecting sleeve. Two fuel assembly bodies are provided; each fuel assembly body has an integrated channel disposed within its interior, the integrated channel being arranged axially along the fuel assembly body for conducting coolant; the two fuel assembly bodies are arranged opposite each other along their axial direction, and each of the two opposite end faces of the two fuel assembly bodies has a positioning hole, the positioning hole communicating with the integrated channel in the corresponding fuel assembly body. The two ends of the connecting sleeve are adapted to the two positioning holes, and the two ends of the connecting sleeve are respectively inserted into the two positioning holes; the connecting sleeve has a communicating hole inside, the communicating hole communicating with the integrated channel of both fuel assembly bodies, so that the coolant can flow between the two fuel assembly bodies.

[0007] In some embodiments, the fuel assembly body includes multiple integrated channels and multiple positioning holes, with each positioning hole corresponding to one of the multiple integrated channels. Similarly, multiple connecting sleeves are also included, each corresponding to one of the multiple integrated channels.

[0008] In some embodiments, the cross-section of the integrated channel is the same as and corresponds to the cross-section of the corresponding connecting hole.

[0009] In some embodiments, the spliced ​​fuel assembly structure further includes an anti-detachment positioning component. The anti-detachment positioning component includes a first positioning groove, a second positioning groove, and an anti-detachment positioning tenon. The first positioning groove is disposed on the wall of one of the positioning holes. The second positioning groove is disposed on the outer wall of the connecting sleeve and corresponds to the first positioning groove; the extension direction of the second positioning groove is the same as the extension direction of the first positioning groove, and when the connecting sleeve moves the positioning hole, the second positioning groove can communicate with the first positioning groove; the depth of the first positioning groove is less than the depth of the second positioning groove. The anti-detachment positioning tenon is disposed in the second positioning groove; the anti-detachment positioning tenon can slide between the first positioning groove and the second positioning groove under its own weight, and the length of the anti-detachment positioning tenon is greater than the depth of the first positioning groove and less than the depth of the second positioning groove, so that after the anti-detachment positioning tenon slides into the first positioning groove, it fixes the connecting sleeve to the corresponding fuel assembly body.

[0010] In some embodiments, the number of the anti-detachment positioning components is multiple. The multiple anti-detachment positioning components are located on the same side of the central plane of the connecting sleeve.

[0011] In some embodiments, the integrated channel includes a fuel filling channel and a coolant channel, the fuel filling channel for accommodating fuel pellets and the coolant channel for conducting coolant. Both the fuel filling channel and the coolant channel extend axially along the fuel assembly body; the cross-sectional shape of the fuel filling channel is a first circle, and the coolant channel is disposed on the outer wall of the fuel filling channel and communicates with it.

[0012] In some embodiments, the integrated channel has multiple coolant channels, which are evenly distributed in the circumferential direction of the fuel filling channel.

[0013] In some embodiments, the cross-sectional shape of the coolant channel is fan-shaped, and the number of coolant channels is at least three. On the cross-section of the integrated channel, the centers of the plurality of fan-shaped sections lie on the same positioning auxiliary circle, which is concentric with the first circle. The diameter of each fan-shaped section is smaller than the diameter of the positioning auxiliary circle, which in turn is smaller than the diameter of the first circle.

[0014] In some embodiments, the inner wall of the end of the fuel filling channel away from the connecting sleeve is recessed to form a first limiting portion. The inner wall of the connecting sleeve's communicating hole near the first limiting portion is recessed to form a second limiting portion; the second limiting portion is used to limit the fuel pellet in the corresponding fuel filling channel in cooperation with the first limiting portion.

[0015] Therefore, the spliced ​​fuel assembly structure provided in this embodiment of the invention, by setting two fuel assembly bodies and providing an integrated channel inside each fuel assembly body, with the integrated channel arranged along the axial direction of the fuel assembly body, allows coolant to be conducted through the integrated channel for heat dissipation of the fuel assembly body. By arranging the two fuel assembly bodies opposite each other along their axial direction, each of the two opposite end faces of the two fuel assembly bodies has a positioning hole that communicates with the integrated channel in the corresponding fuel assembly body. The two ends of the connecting sleeve are respectively adapted to the two positioning holes, allowing the two fuel assembly bodies to be connected together after the two ends of the connecting sleeve are inserted into the two positioning holes. Furthermore, by opening a connecting hole inside the connecting sleeve, which communicates with the integrated channels of both fuel assembly bodies, the integrated channels of the two fuel assembly bodies can be connected through the connecting hole in the connecting sleeve, thus connecting the two connecting holes into a whole. This allows coolant in one fuel assembly body to flow to the other fuel assembly body through the connecting hole, reducing leakage problems caused by coolant flowing between the two fuel assembly bodies compared to the discontinuous coolant flow channels in the prior art.

[0016] Secondly, embodiments of the present invention also provide a reactor core, the reactor core comprising a plurality of fuel assembly bodies and fuel pellets. At least two of the fuel assembly bodies form the spliced ​​fuel assembly structure described in the first aspect. The number of fuel pellets is plurality of; the plurality of fuel pellets are respectively disposed within the plurality of fuel assembly bodies.

[0017] The reactor core described above has the same beneficial technical effects as the spliced ​​fuel assembly structure provided in some of the above embodiments, and will not be repeated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of this invention, the accompanying drawings used in some embodiments of this invention will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings. Furthermore, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this invention.

[0019] Figure 1 A front view of a graphite fuel assembly provided for the prior art; Figure 2 for Figure 1 Sectional view along the middle AA direction; Figure 3 A partial cross-sectional view of a graphite fuel assembly provided for the prior art; Figure 4 A schematic diagram of a fuel assembly body provided in an embodiment of the present invention; Figure 5 A schematic diagram of a connecting sleeve provided in an embodiment of the present invention; Figure 6 A structural diagram of a fuel assembly body and a connecting sleeve provided in an embodiment of the present invention; Figure 7 A schematic diagram illustrating the connection between the fuel assembly body and the connecting sleeve, provided in an embodiment of the present invention; Figures 8-9 This is a schematic diagram illustrating the working principle of an anti-detachment positioning component provided in an embodiment of the present invention. Figure 10 This is a cross-sectional view of an integrated channel provided in an embodiment of the present invention.

[0020] Among them, 1-fuel channel; 2-coolant flow channel; 3-pin hole; 4-fuel assembly body; 5-integrated channel; 6-positioning hole; 7-connecting sleeve; 8-connecting hole; 9-first positioning groove; 10-second positioning groove; 11-anti-detachment positioning tenon; 12-fuel filling channel; 13-coolant channel; 14-first limiting part; 15-second limiting part. Detailed Implementation

[0021] The technical solutions in some embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided by the present invention are within the scope of protection of the present invention.

[0022] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0023] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0024] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." Furthermore, the specific features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

[0025] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. The embodiments of the invention described herein are not necessarily limited to the content of this document.

[0026] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0027] Example 1: like Figure 4 As shown, this embodiment of the invention provides a spliced ​​fuel assembly structure, which is applied in the reactor core to reduce coolant leakage between the two fuel assembly bodies.

[0028] like Figure 4 and Figure 5 As shown, the spliced ​​fuel assembly structure includes a fuel assembly body 4 and a connecting sleeve 7. There are two fuel assembly bodies 4. An integrated channel 5 is provided inside each fuel assembly body 4, arranged axially along the fuel assembly body 4, for conducting coolant. The two fuel assembly bodies 4 are arranged opposite each other along their axial direction, and positioning holes 6 are provided on both opposite end faces of the two fuel assembly bodies 4, communicating with the integrated channel 5 in the corresponding fuel assembly body 4. Figure 6 The two ends of the connecting sleeve 7 are respectively adapted to the two positioning holes 6, and the two ends of the connecting sleeve 7 are respectively inserted into the two positioning holes 6; the connecting sleeve 7 has a connecting hole 8 inside, which is connected to the integrated channel 5 of the two fuel assembly bodies 4, so that the coolant can flow in the two fuel assembly bodies 4.

[0029] For example, the fuel assembly body 4 is a prismatic moderator brick, such as... Figure 4As shown, the fuel assembly body 4 is hexagonal prism in shape. The fuel assembly body 4 is made of graphite, ceramic, or metal. Fuel pellets can be loaded into the fuel assembly body 4.

[0030] For example, the fuel assembly body 4 can be horizontally positioned, in which case the extension direction of the integrated channel 5 is horizontal.

[0031] For example, the coolant can be helium. The coolant can dissipate heat from the fuel assembly body 4 as it flows in the integrated channel 5.

[0032] For example, such as Figure 6 As shown, the positioning hole 6 is connected to the end of the integrated channel 5.

[0033] For example, the material of the connecting sleeve 7 is the same as that of the fuel assembly body 4, which can be graphite, ceramic or metal.

[0034] The two ends of the connecting sleeve 7 are respectively adapted to the two positioning holes 6, indicating that the two ends of the connecting sleeve 7 can be inserted into the two positioning holes 6.

[0035] For example, the shape and size of the cross-section of the connecting sleeve 7 are the same as the shape and size of the cross-section of the positioning hole 6, so that after the two ends of the connecting sleeve 7 are inserted into the two positioning holes 6, the two fuel assembly bodies 4 can be connected together.

[0036] With the above configuration, the integrated channel 5 of the two fuel assembly bodies 4 can be connected through the connecting hole 8 in the connecting sleeve 7, and the two connecting holes 8 can be connected as a whole. This allows the coolant in one fuel assembly body 4 to flow to the other fuel assembly body 4 through the connecting hole 8. Compared with the two discontinuous coolant flow channels 2 in the prior art, this can reduce the leakage problem caused by the coolant flowing between the two fuel assembly bodies 4.

[0037] Therefore, the spliced ​​fuel assembly structure provided in this embodiment of the invention, by setting two fuel assembly bodies 4 and providing an integrated channel 5 inside the fuel assembly body 4, with the integrated channel 5 arranged along the axial direction of the fuel assembly body 4, allows coolant to be conducted through the integrated channel 5 to dissipate heat from the fuel assembly body 4. By arranging the two fuel assembly bodies 4 opposite each other along their axial direction, and providing positioning holes 6 on both opposite end faces of the two fuel assembly bodies 4, the positioning holes 6 communicate with the integrated channel 5 in the corresponding fuel assembly body 4, and the two ends of the connecting sleeve 7 are respectively adapted to the two positioning holes 6, the two fuel assembly bodies 4 can be connected together after the two ends of the connecting sleeve 7 are respectively inserted into the two positioning holes 6. Furthermore, by opening a connecting hole 8 inside the connecting sleeve 7, the connecting hole 8 is connected to the integrated channel 5 of both fuel assembly bodies 4. The integrated channel 5 of the two fuel assembly bodies 4 can be connected through the connecting hole 8 in the connecting sleeve 7, thereby connecting the two connecting holes 8 into a whole. This allows the coolant in one fuel assembly body 4 to flow to the other fuel assembly body 4 through the connecting hole 8. Compared with the two discontinuous coolant flow channels 2 in the prior art, this can reduce the leakage problem caused by the coolant flowing between the two fuel assembly bodies 4.

[0038] In some embodiments, such as Figure 4 As shown, the fuel assembly body 4 contains multiple integrated channels 5 and multiple positioning holes 6, with each positioning hole 6 corresponding to a different integrated channel 5. There are also multiple connecting sleeves 7, each corresponding to a different integrated channel 5.

[0039] For example, in combination Figure 6 Each fuel assembly body 4 has five integrated channels 5 and five positioning holes 6, each positioning hole 6 communicating with a corresponding integrated channel 5. There are also five connecting sleeves 7, each of which is inserted into a positioning hole 6 connected to a corresponding integrated channel 5.

[0040] With the above configuration, each integrated channel 5 in the two fuel assembly bodies 4 can be connected via the connecting sleeve 7, thereby reducing leakage problems caused by coolant flowing in each integrated channel 5 in the two fuel assembly bodies 4. It is understandable that by setting multiple connecting sleeves 7, the relative positions of the two fuel assembly bodies 4 can also be positioned, preventing relative rotation between the two fuel assembly bodies 4.

[0041] In some embodiments, such as Figure 4 and Figure 5 As shown, the cross-section of the integrated channel 5 is the same as and corresponds to the cross-section of the corresponding connecting hole 8.

[0042] The cross-section of the integrated channel 5 is the same as the cross-section of the corresponding connecting hole 8, indicating that the shape and size of the cross-section of the integrated channel 5 are the same as the shape and size of the cross-section of the corresponding connecting hole 8.

[0043] The cross-section of the integrated channel 5 corresponds to the cross-section of the corresponding connecting hole 8, indicating that the position of the cross-section of the integrated channel 5 is the same as the position of the cross-section of the corresponding connecting hole 8.

[0044] For example, when the cross-sectional shape of the integrated channel 5 is quadrilateral, the cross-sectional shape of the corresponding connecting hole 8 is also quadrilateral, and the two quadrilaterals are in the same position and size.

[0045] The above settings ensure that the flow shape and area of ​​the coolant are the same when it flows in the integrated channel 5 and the connecting hole 8, thus avoiding affecting the resistance when the coolant flows.

[0046] In some embodiments, such as Figure 7 , Figure 8 and Figure 9 As shown, the spliced ​​fuel assembly structure also includes an anti-detachment positioning component. The anti-detachment positioning component includes a first positioning groove 9, a second positioning groove 10, and an anti-detachment positioning tenon 11. The first positioning groove 9 is disposed on the wall of a positioning hole 6. The second positioning groove 10 is disposed on the outer wall of the connecting sleeve 7 and corresponds to the first positioning groove 9; the extension direction of the second positioning groove 10 is the same as the extension direction of the first positioning groove 9, allowing the second positioning groove 10 to communicate with the first positioning groove 9 when the connecting sleeve 7 moves the positioning hole 6. The depth of the first positioning groove 9 is less than the depth of the second positioning groove 10. The anti-detachment positioning tenon 11 is disposed in the second positioning groove 10; the anti-detachment positioning tenon 11 can slide between the first positioning groove 9 and the second positioning groove 10 under its own weight. The length of the anti-detachment positioning tenon 11 is greater than the depth of the first positioning groove 9 and less than the depth of the second positioning groove 10, so that after the anti-detachment positioning tenon 11 slides into the first positioning groove 9, it fixes the connecting sleeve 7 to the corresponding fuel assembly body 4.

[0047] For example, the first positioning groove 9, the second positioning groove 10, and the anti-detachment positioning tenon 11 are all elongated. The width of the first positioning groove 9 and the second positioning groove 10 is slightly larger than the width of the anti-detachment positioning tenon 11, so that the anti-detachment positioning tenon 11 can slide between the first positioning groove 9 and the second positioning groove 10.

[0048] Combination Figure 7 and Figure 8The length of the anti-disengagement positioning tenon 11 is less than the depth of the second positioning groove 10. Therefore, the anti-disengagement positioning tenon 11 can be fully inserted into the second positioning groove 10. When it is necessary to insert the connecting sleeve 7 into the positioning hole 6, first fully insert the anti-disengagement positioning tenon 11 into the second positioning groove 10 to avoid interference between the anti-disengagement positioning tenon 11 and the inner wall of the positioning hole 6, which would affect the insertion of the connecting sleeve 7 into the positioning hole 6.

[0049] During the process of inserting the connecting sleeve 7 into the positioning hole 6, the fuel assembly body 4 is rotated so that the second positioning groove 10 is positioned above the first positioning groove 9; when the first positioning groove 9 and the second positioning groove 10 are connected after the connecting sleeve 7 is inserted into the positioning hole 6, the anti-disengagement positioning tenon 11 can slide into the first positioning groove 9 under its own gravity.

[0050] Combination Figure 7 and Figure 9 The length of the anti-detachment positioning tenon 11 is greater than the depth of the first positioning groove 9. Therefore, the top of the anti-detachment positioning tenon 11 extends into the second positioning groove 10. At this time, the anti-detachment positioning tenon 11 fixes the connecting sleeve 7 on the corresponding fuel assembly body 4, which can prevent the connecting sleeve 7 from rotating relative to the corresponding fuel assembly body 4.

[0051] Understandably, when it is necessary to remove the connecting sleeve 7, the fuel assembly body 4 is rotated so that the second positioning groove 10 is below the first positioning groove 9. At this time, the anti-detachment positioning tenon 11 can slide into the second positioning groove 10 under its own gravity, and the connecting sleeve 7 is separated from the rotating fuel assembly body 4. The connecting sleeve 7 can then be removed from the rotating fuel assembly body 4.

[0052] With the above settings, the connecting sleeve 7 and the corresponding fuel assembly body 4 can be fixedly positioned and separated by the anti-detachment positioning tenon 11.

[0053] In some embodiments, such as Figure 8 and Figure 9 As shown, there are multiple anti-detachment positioning components. These multiple anti-detachment positioning components are located on the same side of the central plane of the connecting sleeve 7.

[0054] For example, the number of anti-detachment positioning components can be two, three, or four, etc.

[0055] It is understandable that the central plane of the connecting sleeve 7 is a plane that passes through the center line of the connecting sleeve 7 and divides the connecting sleeve 7 equally along the center line direction.

[0056] By setting multiple anti-detachment positioning components on the same side of the central plane of the connecting sleeve 7, the multiple anti-detachment positioning tenons 11 in the rotating fuel assembly body 4 can be simultaneously slid into the first positioning groove 9 or the second positioning groove 10 under their own gravity by rotating the fuel assembly body 4, so that the multiple anti-detachment positioning tenons 11 can simultaneously achieve the fixed positioning or separation of the connecting sleeve 7 and the corresponding fuel assembly body 4.

[0057] In existing technologies, such as Figure 1 As shown, fuel channel 1 and coolant channel 2 are independently distributed and do not interfere with each other. This scheme will prevent the fuel pellets in fuel channel 1 from contacting the flowing coolant. The heat generated by the fuel pellets must pass through the air chambers and graphite around the pellets before being transferred to the coolant, resulting in relatively low heat exchange efficiency.

[0058] Based on this, in some embodiments of the present invention, such as Figure 7 and Figure 10 As shown, the integrated channel 5 includes a fuel filling channel 12 and a coolant channel 13. The fuel filling channel 12 is used to accommodate fuel pellets, and the coolant channel 13 is used to conduct coolant. Both the fuel filling channel 12 and the coolant channel 13 extend axially along the fuel assembly body 4. The cross-sectional shape of the fuel filling channel 12 is a first circle Y1, and the coolant channel 13 is disposed on the outer wall of the fuel filling channel 12 and communicates with the fuel filling channel 12.

[0059] For example, the dimensions of the fuel filling channel 12 are adapted to the external dimensions of the fuel pellets so that the fuel pellets can be placed in the fuel filling channel 12.

[0060] With the above configuration, the coolant in the coolant channel 13 can directly contact the fuel pellets in the fuel filling channel 12, thereby directly dissipating heat from the fuel pellets and improving the heat dissipation efficiency of the fuel pellets.

[0061] In some embodiments, such as Figure 10 As shown, in the integrated channel 5, there are multiple coolant channels 13, which are evenly distributed in the circumferential direction of the fuel filling channel 12.

[0062] For example, such as Figure 10 As shown, there are three coolant channels 13, and the included angle between the centers of any two adjacent coolant channels 13 is 120°.

[0063] With the above configuration, the fuel pellet can be cooled simultaneously at multiple locations on the outside of the fuel pellet through multiple coolant channels 13, thereby improving the efficiency and uniformity of fuel pellet cooling.

[0064] In some embodiments, such as Figure 10As shown, the cross-sectional shape of the coolant channel 13 is fan-shaped, and the number of coolant channels 13 is at least three. On the cross-section of the integrated channel 5, the centers of multiple fan-shaped sections lie on the same positioning auxiliary circle Y2, which is concentric with the first circle Y1. The diameter R3 of the fan-shaped section is smaller than the diameter R2 of the positioning auxiliary circle Y2, and the diameter R2 of the positioning auxiliary circle Y2 is smaller than the diameter R1 of the first circle Y1.

[0065] For example, the number of coolant channels 13 can be three, four, or five, etc. Figure 10 As shown, in this embodiment, the number of coolant channels 13 is three as an example for explanation.

[0066] By setting the diameter R3 of the fan shape to be smaller, it is possible to avoid the opening size between the coolant channel 13 and the fuel filling channel 12 being too large, which would cause the fuel pellets in the fuel filling channel 12 to slide into the coolant channel 13.

[0067] The inventors have verified that this design facilitates the manufacture of the fuel filling channel 12 and the coolant channel 13, and improves the heat dissipation effect of the fuel pellets in the fuel filling channel 12.

[0068] In some embodiments, such as Figure 6 As shown, the inner wall of the end of the fuel filling channel 12 away from the connecting sleeve 7 is recessed to form a first limiting part 14. The inner wall of the connecting hole 8 of the connecting sleeve 7 near the first limiting part 14 is recessed to form a second limiting part 15. The second limiting part 15 is used to limit the fuel pellet in the corresponding fuel filling channel 12 in cooperation with the first limiting part 14.

[0069] like Figure 6 As shown, the fuel pellets are loaded in the fuel filling channel 12 between the first limiting part 14 and the second limiting part 15.

[0070] By providing the first limiting part 14 and the second limiting part 15, the fuel pellets in the fuel filling channel 12 can be prevented from falling from both ends of the fuel filling channel 12.

[0071] Example 2: This invention also provides a reactor core, which includes multiple fuel assembly bodies 4 and fuel pellets. At least two fuel assembly bodies 4 form the spliced ​​fuel assembly structure in Embodiment 1. There are multiple fuel pellets; these multiple fuel pellets are respectively disposed within multiple fuel assembly bodies 4.

[0072] For example, the reactor core can be a horizontally positioned high-temperature gas-cooled reactor.

[0073] By adopting the above settings, leakage problems caused by coolant flowing between the two fuel assembly bodies can be reduced, thereby improving the heat dissipation efficiency of coolant on the fuel pellets in the fuel assembly body 4.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A spliced ​​fuel assembly structure, characterized in that, include: Two fuel assembly bodies (4) are provided; each fuel assembly body (4) has an integrated channel (5) inside, which is arranged along the axial direction of the fuel assembly body (4) for conducting coolant; the two fuel assembly bodies (4) are arranged opposite each other along their axial direction, and each of the two opposite end faces of the two fuel assembly bodies (4) has a positioning hole (6) that communicates with the integrated channel (5) in the corresponding fuel assembly body (4); and, A connecting sleeve (7) is provided, the two ends of which are adapted to the two positioning holes (6), and the two ends of the connecting sleeve (7) are respectively inserted into the two positioning holes (6); a connecting hole (8) is provided inside the connecting sleeve (7), and the connecting hole (8) is connected to the integrated channel (5) of the two fuel assembly bodies (4) so ​​that the coolant can flow in the two fuel assembly bodies (4).

2. The spliced ​​fuel assembly structure according to claim 1, characterized in that, In the fuel assembly body (4), there are multiple integrated channels (5) and multiple positioning holes (6), and the multiple positioning holes (6) are correspondingly arranged with the multiple integrated channels (5); The number of the connecting sleeves (7) is multiple, and the multiple connecting sleeves (7) are correspondingly set with the multiple integrated channels (5).

3. The spliced ​​fuel assembly structure according to claim 2, characterized in that, The cross-section of the integrated channel (5) is the same as and corresponds to the cross-section of the corresponding connecting hole (8).

4. The spliced ​​fuel assembly structure according to claim 3, characterized in that, It also includes anti-detachment positioning components; The anti-detachment positioning component includes: The first positioning groove (9) is provided on the wall of one of the positioning holes (6); The second positioning groove (10) is disposed on the outer wall of the connecting sleeve (7) and corresponds to the first positioning groove (9); the extension direction of the second positioning groove (10) is the same as the extension direction of the first positioning groove (9), and when the connecting sleeve (7) moves the positioning hole (6), the second positioning groove (10) can communicate with the first positioning groove (9); the depth of the first positioning groove (9) is less than the depth of the second positioning groove (10); and, An anti-detachment positioning tenon (11) is provided in the second positioning groove (10); the anti-detachment positioning tenon (11) can slide between the first positioning groove (9) and the second positioning groove (10) under its own weight. The length of the anti-detachment positioning tenon (11) is greater than the depth of the first positioning groove (9) and less than the depth of the second positioning groove (10), so that the anti-detachment positioning tenon (11) slides into the first positioning groove (9) and fixes the connecting sleeve (7) on the corresponding fuel assembly body (4).

5. The spliced ​​fuel assembly structure according to claim 4, characterized in that, The number of the anti-detachment positioning components is multiple; Multiple anti-detachment positioning components are located on the same side of the central plane of the connecting sleeve (7).

6. The spliced ​​fuel assembly structure according to claim 4, characterized in that, The integrated channel (5) includes a fuel filling channel (12) and a coolant channel (13). The fuel filling channel (12) is used to accommodate fuel pellets, and the coolant channel (13) is used to conduct coolant. Both the fuel filling channel (12) and the coolant channel (13) extend along the axial direction of the fuel assembly body (4); the cross-sectional shape of the fuel filling channel (12) is a first circle, and the coolant channel (13) is disposed on the outer side wall of the fuel filling channel (12) and communicates with the fuel filling channel (12).

7. The spliced ​​fuel assembly structure according to claim 6, characterized in that, In the integrated channel (5), there are multiple coolant channels (13), and the multiple coolant channels (13) are evenly distributed in the circumferential direction of the fuel filling channel (12).

8. The spliced ​​fuel assembly structure according to claim 7, characterized in that, The cross-sectional shape of the coolant channel (13) is fan-shaped, and the number of the coolant channels (13) is at least three; On the cross-section of the integrated channel (5), the centers of the multiple fan-shaped circles are on the same positioning auxiliary circle, and the positioning auxiliary circle is concentric with the first circle; The diameter of the sector is smaller than the diameter of the positioning auxiliary circle, and the diameter of the positioning auxiliary circle is smaller than the diameter of the first circle.

9. The spliced ​​fuel assembly structure according to claim 6, characterized in that, The inner wall of the fuel filling channel (12) at the end away from the connecting sleeve (7) is recessed to form a first limiting part (14). The inner sidewall of the connecting hole (8) of the connecting sleeve (7) near the first limiting part (14) is recessed to form a second limiting part (15); the second limiting part (15) is used to limit the fuel pellet in the corresponding fuel filling channel (12) with the cooperation of the first limiting part (14).

10. A reactor core, characterized in that, include: Multiple fuel assembly bodies (4), at least two of the fuel assembly bodies (4) form the spliced ​​fuel assembly structure according to any one of claims 1-9; and, There are multiple fuel pellets; the multiple fuel pellets are respectively disposed in the multiple fuel assembly bodies (4).

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