Core assembly coolant flow distribution device and core support system

Abstract

Embodiments of the present application provide a reactor core assembly coolant flow distribution device and a reactor core support system. The reactor core assembly coolant flow distribution device includes a first flange provided with a plurality of through holes; a second flange arranged in parallel and spaced apart below the first flange; a cylindrical portion arranged between the first flange and the second flange, the first flange, the second flange and the cylindrical portion defining a low temperature zone for inputting coolant, an upper portion of the first flange defining a high temperature zone for guiding the coolant into the reactor core assembly to cool the reactor core assembly; a distribution mechanism installed in the through hole formed by the first flange, the portion of the distribution mechanism inside the high temperature zone being assembled with the reactor core assembly, and the portion of the distribution mechanism inside the low temperature zone being configured to communicate with the low temperature zone to guide and distribute the coolant into the reactor core assembly at different positions in the high temperature zone so that the reactor core assembly is cooled. The reactor core support system includes the reactor core assembly coolant flow distribution device, a restraint device and an annular compensator.

Description

Technical Field

[0001] The embodiments of the present invention relate to reactor core structures, and more specifically, to a core assembly coolant flow distribution device and a core support system. Background Technology

[0002] In a pool-type sodium-cooled fast neutron reactor, multiple generally cylindrical core assemblies are included to form the core.

[0003] The coolant (such as sodium) required for core assemblies located in different flow zones varies, and it is necessary to allocate it reasonably according to the flow requirements of the core assemblies to prevent overheating or undercooling in some areas of the core.

[0004] Therefore, a coolant flow distribution device for reactor core components needs to be designed. Summary of the Invention

[0005] To address at least one technical problem mentioned above and in other aspects of the prior art, embodiments of the present invention provide a core assembly coolant flow distribution device and a core support system. The mounting mechanism serves as the base for mounting the core assembly and forms a low-temperature zone for coolant input. The distribution mechanism is mounted on the mounting assembly to connect the low-temperature zone and the high-temperature zone where the core assembly is mounted, and distributes the coolant into the corresponding core assembly, thereby cooling the core assembly.

[0006] One aspect of the present invention provides a core assembly coolant flow distribution device, comprising: an installation mechanism including: a first flange having a plurality of through holes; a second flange disposed parallel to and spaced below the first flange; a cylindrical portion disposed between the first flange and the second flange, wherein the first flange, the second flange and the cylindrical portion define a low-temperature zone for inputting coolant, and the upper part of the first flange defines a high-temperature zone for introducing coolant into the core assembly to cool the core assembly; and a distribution mechanism installed in the through holes formed by the first flange, wherein a portion of the distribution mechanism located inside the high-temperature zone is configured to be assembled with the core assembly, and a portion of the distribution mechanism located inside the low-temperature zone is configured to communicate with the low-temperature zone, so as to guide and distribute the coolant to different positions in the core assembly within the high-temperature zone, thereby cooling the core assembly.

[0007] Another aspect of the present invention provides a core support system, including a core assembly coolant flow distribution device configured to detachably mount a plurality of core assemblies; a constraint device mounted above the core assembly coolant flow distribution device and sleeved on the outside of the plurality of core assemblies located on the outer side to limit the radial position of the core assemblies relative to the core assembly coolant flow distribution device; and an annular compensation member mounted between the distribution device and the constraint device to limit the displacement of the distribution device relative to the constraint device.

[0008] According to the core assembly coolant flow distribution device and core support system provided by the present invention, the mounting mechanism serves as the base for mounting the core assembly and forms a cryogenic zone for input coolant. The distribution mechanism is mounted on the mounting assembly for assembly with multiple core assemblies to fix the core assemblies to the distribution mechanism and to connect each core assembly to the coolant in the cryogenic zone, so that the coolant can be introduced and distributed into the corresponding core assembly via the distribution mechanism to cool the core assembly. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of a core assembly coolant flow distribution device according to an illustrative embodiment of the present invention;

[0010] Figure 2 yes Figure 1 A cross-sectional view of the first distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment;

[0011] Figure 3 yes Figure 2 Top view of the first distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment;

[0012] Figure 4 yes Figure 1 A cross-sectional view of the second distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment;

[0013] Figure 5 yes Figure 4 A cross-sectional view of the second sleeve of the core assembly coolant flow distribution device shown in the schematic embodiment;

[0014] Figure 6 yes Figure 1 A cross-sectional view of the third distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment;

[0015] Figure 7 yes Figure 6 A cross-sectional view of the third sleeve of the core assembly coolant flow distribution device shown in the schematic embodiment;

[0016] Figure 8 yes Figure 1 A schematic diagram of the through-hole arrangement of the first flange of the core assembly coolant flow distribution device in the illustrated embodiment.

[0017] Figure 9 yes Figure 1 A schematic diagram of the arrangement of the distribution mechanism of the core assembly coolant flow distribution device in the illustrative embodiment shown;

[0018] Figure 10 yes Figure 9 A partial enlarged view of part A of the reactor core assembly coolant flow distribution device in the schematic embodiment shown;

[0019] Figure 11 This is an exploded view of a core support system according to an illustrative embodiment of the present invention; and

[0020] Figure 12 yes Figure 11 A cross-sectional view of the constraint device of the core support system of the schematic embodiment shown.

[0021] The meanings of the reference numerals in the above figures are as follows:

[0022] 1. Installation mechanism;

[0023] 11. First flange;

[0024] 12. Cylindrical section;

[0025] 13. Sodium supply tube;

[0026] 14. Flow equalizer;

[0027] 15. Second flange;

[0028] 2. Distribution organization;

[0029] 21. First sleeve;

[0030] 211. Coolant inlet;

[0031] 212. Bucket-shaped part;

[0032] 213. First tubular section;

[0033] 22. First header;

[0034] 221. First assembly hole;

[0035] 222. First deflector plate;

[0036] 223. First mixing chamber;

[0037] 224. Flow diversion channel;

[0038] 225. First external drainage channel;

[0039] 226. First Installation Section;

[0040] 2261. Second tubular section;

[0041] 23. Second container;

[0042] 231. Second assembly hole;

[0043] 232. Second deflector;

[0044] 233. Second mixing chamber;

[0045] 234. Second external drainage channel;

[0046] 235. Exhaust passage;

[0047] 236. Second Installation Department;

[0048] 24. Second sleeve;

[0049] 25. Third container;

[0050] 251. Third assembly hole;

[0051] 252. Third mixing chamber;

[0052] 253. Third external drainage channel;

[0053] 254. Third vent;

[0054] 26. The third sleeve;

[0055] 3. Throttling tube;

[0056] 41. Hoop-shaped connector;

[0057] 42. First bolt;

[0058] 43. The second bolt;

[0059] 44. The third bolt;

[0060] 5. Circular compensation component;

[0061] 6. Restraint devices;

[0062] 61. Enclosure panels;

[0063] 62. Support plate;

[0064] 63. Lower end;

[0065] 64. Neutron injection channel;

[0066] 65. Enclosure tube;

[0067] 66. Inner flange;

[0068] 67. Sodium inlet; and

[0069] 68. Convex strips. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0071] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0072] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0073] Figure 1 This is a cross-sectional view of a core assembly coolant flow distribution device according to an illustrative embodiment of the present invention.

[0074] This invention provides a core assembly coolant flow distribution device, such as... Figure 1 As shown, the device includes an installation mechanism 1 and a distribution mechanism 2. The installation mechanism 1 includes a first flange 11, a second flange 15, and a cylindrical portion 12. The first flange 11 has multiple through holes. The second flange 15 is disposed parallel to and spaced below the first flange 11. The cylindrical portion 12 is disposed between the first flange 11 and the second flange 15, defining a low-temperature zone for introducing coolant between the first flange 11, the second flange 15, and the cylindrical portion 12. A high-temperature zone is defined above the first flange 11 for guiding coolant into the core assembly to cool the core assembly. The distribution mechanism 2 is installed within the through holes formed by the first flange 11. The portion of the distribution mechanism 2 located inside the high-temperature zone is configured to assemble with the core assembly, and the portion of the distribution mechanism 2 located inside the low-temperature zone is configured to communicate with the low-temperature zone, guiding and distributing coolant to different locations within the core assembly in the high-temperature zone, thereby cooling the core assembly.

[0075] In one illustrative embodiment, the first flange 11, the second flange 15, and the cylindrical portion 12 form a near-cylindrical mounting mechanism 1.

[0076] In detail, the mounting mechanism 1 is mounted above the in-pile support mechanism via the second flange 15.

[0077] In one illustrative embodiment, sodium supply pipes 13 for supplying sodium to the low-temperature zone are evenly spaced on the side wall of the cylindrical portion 12.

[0078] In detail, the sodium supply tube 13 extends outward along the radial direction of the cylindrical portion 12 and is connected to an external sodium source.

[0079] Furthermore, the number of sodium supply tubes 13 is not limited to being configured as 4, 6, 8 or other numbers, but is preferably configured to meet the size of the fast reactor and the number of loops.

[0080] In this implementation, the mounting mechanism 1 serves as the base for mounting the core assemblies and forms a cryogenic zone for inputting coolant. The distribution mechanism 2 is mounted on the mounting mechanism 1 and is used to assemble multiple core assemblies. Based on the technical requirements of the core, corresponding core assemblies are set up, and the specific structure of the distribution mechanism 2 is designed according to the structure and quantity of the specific core assemblies. This allows different core assemblies to be fixed to the distribution mechanism 2, and ensures that each core assembly is connected to the coolant in the cryogenic zone. The coolant can then be introduced and distributed to the corresponding core assembly via the distribution mechanism 2 to cool the core assembly.

[0081] According to embodiments of this disclosure, such as Figure 1 As shown, the installation mechanism 1 also includes a flow equalization plate 14 disposed between the first flange 11 and the second flange 15 and located inside the cylindrical portion 12. The flow equalization plate 14 is constructed into a cylindrical structure and has a plurality of flow equalization holes that extend in the radial direction.

[0082] In one illustrative embodiment, the flow equalizer 14 is configured as a cylindrical structure.

[0083] In detail, the axes of the flow equalizer 14 and the cylindrical part 12 extend in the same direction.

[0084] In one illustrative embodiment, the coolant includes, but is not limited to, liquid sodium.

[0085] In this implementation, the liquid sodium first passes through multiple flow equalization holes on the flow equalization plate 14 from the sodium supply pipe 13 before entering the low-temperature zone. This reduces the flow rate of the liquid sodium and also allows the liquid sodium to diffuse evenly within the low-temperature zone.

[0086] According to embodiments of this disclosure, such as Figure 1 As shown, the core assembly coolant flow distribution device also includes a throttling pipe 3 disposed on the lower end face of the second flange 15, which is configured to connect the cryogenic zone and the main container cooling zone, so that the coolant is output from the cryogenic zone to the main container cooling zone to cool the main container cooling device in the main container cooling zone.

[0087] In one illustrative embodiment, a plurality of throttling tubes 3 are included.

[0088] In detail, multiple throttling pipes 3 are evenly spaced within the bottom surface of the second flange 15.

[0089] Furthermore, the upper end of each throttling tube 3 is connected to the low-temperature zone, and the lower end is connected to the cooling zone of the main container.

[0090] In this implementation, the throttling pipe 3 is used to supply a portion of the sodium solution in the low-pressure zone to the main vessel cooling unit. The number, size, and location of the throttling pipes 3 should preferably meet the reactor diameter and the required flow rate.

[0091] Figure 2 yes Figure 1 A cross-sectional view of the first distribution component of the reactor core assembly coolant flow distribution device in the illustrative embodiment shown. Figure 3 yes Figure 2 A top view of the first distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment.

[0092] According to embodiments of this disclosure, such as Figure 2 and Figure 3 As shown, the distribution mechanism 2 includes multiple first distribution components. Each first distribution component includes a first sleeve 21 and a first header 22. The upper part of the first sleeve 21 is installed within a portion of a through-hole formed by the first flange 11. The portion of the first sleeve 21 located below the first flange 11 has a coolant inlet 211 communicating with the cryogenic zone. The first header 22 includes a first mounting portion 226, a first mounting hole 221, and a flow channel 224. The first mounting portion 226 is located at the lower end of the first header 22 and is configured to fit inside the first sleeve 21 to restrict the position of the first header 22 relative to the first sleeve 21. The first mounting hole 221 is formed at the upper end of the first header 22 and extends in a direction orthogonal to the first flange 11, and is configured to fit with the core assembly to restrict the position of the core assembly relative to the first header 22. The flow channel 224 is formed in the first header 22 between the coolant inlet 211 and the first assembly hole 221, and is configured to connect the coolant inlet 211 and the first assembly hole 221, so that coolant is input into the core assembly installed in the first assembly hole 221 via the flow channel 224.

[0093] According to embodiments of this disclosure, such as Figure 2As shown, the first sleeve 21 includes a funnel-shaped portion 212 and a first tubular portion 213. The funnel-shaped portion 212 is configured as a funnel shape, and a plurality of coolant inlets 211 are evenly spaced on the side wall of the funnel-shaped portion 212. The first tubular portion 213 is integrally disposed at the lower end of the funnel-shaped portion 212, extends in a direction orthogonal to the second flange 15, and is mounted on the second flange 15.

[0094] According to embodiments of this disclosure, such as Figure 2 As shown, the first mounting portion 226 includes a second tubular portion 2261, which is sleeved inside the first tubular portion 213 and communicates with it. The portion of the first tubular portion 213 located inside the second tubular portion 2261 is assembled with the second tubular portion 2261 by a clamp-shaped connector 41, so that the first header 22 is held on the first sleeve 21.

[0095] In one illustrative embodiment, such as Figure 1 As shown, the second flange 15 also has a through hole at the orthographic projection position corresponding to the through hole of the first flange 11 in the vertical direction.

[0096] Furthermore, the upper end of the bucket-shaped portion 212 of the first sleeve 21 is fixed in the through hole formed by the first flange 11, the lower end of the bucket-shaped portion 212 is located in the low temperature zone, and the lower end of the first tubular portion 213 is fixed in the through hole formed by the second flange 15.

[0097] Furthermore, the extension directions of the through holes of the first flange 11, the through holes of the second flange 15, and the axis of the first sleeve 21 coincide.

[0098] In one illustrative embodiment, such as Figure 1 As shown, the bucket-shaped portion 212 and the first tubular portion 213 are fixed in the through hole formed by the first flange 11 and the second flange 15 by means of welding, riveting, embedding, interference fit and any other method, including but not limited to welding, riveting, embedding, interference fit and any other method.

[0099] In detail, the bucket-shaped portion 212 and the first tubular portion 213 are welded to the inside of the through hole formed by the first flange 11 and the second flange 15.

[0100] Furthermore, such as Figure 2 As shown, a long strip-shaped coolant inlet 211 is formed on the side wall of the bucket-shaped part 212.

[0101] In one illustrative embodiment, such as Figure 2 As shown, a hoop-shaped connector 41 is fitted between the first tubular portion 213 and the second tubular portion 2261.

[0102] Furthermore, a plurality of first bolts 42 are installed in the radial direction of the second tubular portion 2261, and the ends of the plurality of first bolts 42 located inside the second tubular portion 2261 are installed on the outer wall of the first tubular portion 213.

[0103] In this implementation, the elongated coolant inlet 211 located in the cryogenic zone is used to introduce liquid sodium from the cryogenic zone into the first header 22, and then guide it through the guide channel 224 formed in the first header 22 to the first assembly hole 221. This connects the high-temperature zone and the cryogenic zone, allowing liquid sodium to enter the core assembly installed on the first header 22 to cool the corresponding core assembly.

[0104] According to embodiments of this disclosure, such as Figure 2 and Figure 3 As shown, the first header 22 includes a plurality of evenly spaced first mounting holes 221. The first header 22 also includes a first mixing chamber 223 formed between the plurality of first mounting holes 221 and the flow channel 224. The first mixing chamber 223 is configured to communicate the flow channel 224 with each first mounting hole 221, such that a portion of the coolant input through the flow channel 224 is distributed into each first mounting hole 221.

[0105] According to embodiments of this disclosure, such as Figure 2 and Figure 3 As shown, the lower part of the first sleeve 21 is mounted on the second flange 15 and is configured to communicate with the main container cooling zone below the second flange 15. One of a plurality of first mounting holes 221 is located in the middle of the first header 22, and the other plurality of first mounting holes 221 are spaced apart around the first mounting hole 221 located in the middle. The first header 22 also includes a plurality of first exhaust channels 225 and a first vent. The plurality of first exhaust channels 225 are located below each of the first mounting holes 221 located on the outer side and are configured to communicate the first mixing chamber 223 with the high-temperature zone, so that a portion of the coolant is discharged to the high-temperature zone. The first vent, located below the first mounting hole 221 located in the middle, is configured to communicate with the lower part of the first sleeve 21, so that the gas in the first vent can be discharged to the main container cooling zone.

[0106] In one illustrative embodiment, such as Figure 2 and Figure 3 As shown, the first header 22 includes a housing and multiple modules formed within the housing and integrally formed with the housing.

[0107] In detail, the multiple modules include a central module disposed in the middle of the housing, and multiple side modules evenly spaced and formed on the circumferential outer side of the central module.

[0108] Furthermore, a flow channel 224 is formed between adjacent side modules, which is connected to the coolant inlet 211.

[0109] In one illustrative embodiment, such as Figure 2 As shown, the upper surface of the central module and each side module is provided with a first assembly hole 221.

[0110] In detail, the first mounting hole 221 is along the vertical direction (e.g., Figure 2 (Extends in the upward and downward directions as shown).

[0111] Furthermore, to meet the assembly requirements of the core assembly, a flange adapted to the size and shape of the core assembly is provided in the first assembly hole 221.

[0112] Furthermore, to prevent incorrect insertion of different core components, at least one of the positions, sizes, and shapes of the flanges provided in a portion of the first mounting holes 221 can be configured to differ from other first mounting holes 221 (e.g., Figure 2 The first mounting hole 221 is shown on the right side.

[0113] In one illustrative embodiment, such as Figure 2 As shown, the first header 22 has a first mixing chamber 223 located below the plurality of first assembly holes 221.

[0114] In detail, the first mixing chamber 223 extends horizontally (e.g., Figure 2 (as shown in the horizontal direction).

[0115] Furthermore, the shape of the first mixing cavity 223 matches the cross-sectional shape of the first header 22 (including but not limited to being constructed as at least one of a circle, ellipse, polygon, and polygon-like shape).

[0116] In one illustrative embodiment, a first discharge channel 225 is provided directly below the first mixing chamber 223 for a plurality of first assembly holes 221 formed on the edge of the first header 22.

[0117] Furthermore, a first exhaust port is provided directly below the first mixing chamber 223 in the first assembly hole 221 formed in the middle of the first header 22.

[0118] This implementation allows a portion of the liquid sodium input from the first header 22 to be discharged through multiple first exhaust channels 225 into a high-temperature zone outside the first header 22, so that it can be redistributed into other distribution components (second distribution component and / or third distribution component). Furthermore, it can be used to discharge a portion of the gas within each first exhaust channel 225 and / or the first mixing chamber 223 to prevent the formation of bubbles that restrict the diffusion of liquid sodium within the first header 22. Also, since the lower end of the first assembly hole 221 located in the middle is covered by other first exhaust channels 225, a first vent hole communicating with the high-temperature zone cannot be formed. Considering the scenario where the core assembly coolant flow distribution device is installed on the in-core support mechanism, by communicating with the main container cooling zone through the first tubular portion 213 of the first sleeve 21, the venting requirements of the first vent hole located in the middle can be met, and a portion of the liquid sodium can flow into the main container cooling zone.

[0119] In one illustrative embodiment, such as Figure 2 As shown, a first guide plate 222 may be provided on the upper and / or lower part of the first mixing chamber 223.

[0120] In detail, the first guide plate 222 is provided with guide holes offset radially from the first external discharge channel 225 and the first assembly hole 221. This allows for changes in flow rate and velocity of the molten sodium during its diffusion within the first header 22, resulting in more uniform distribution and a more stable flow rate of the molten sodium as it enters the core assembly and / or the high-temperature zone.

[0121] In one illustrative embodiment, such as Figure 3 As shown, the first header 22 is constructed as a polygonal structure.

[0122] In detail, the first header 22 is constructed as a hexagonal-like structure (e.g., Figure 3 (as shown in the plum blossom shape).

[0123] Furthermore, the first header 22 includes a shell configured as a hexagon, a central module configured as a columnar structure, and multiple six-sided modules configured as fan-shaped structures.

[0124] Furthermore, the upper ends of the central module and the six side modules form first mounting holes 221. It should be understood that the embodiments of this disclosure are not limited thereto.

[0125] For example, the shell of the first header 22 can be constructed as a triangular, quadrilateral, pentagonal, heptagonal, or other polygonal or polygon-like structure.

[0126] In this implementation, the first header 22 is constructed as a hexagonal structure that is both centrally symmetric and axially symmetric. This facilitates the uniform discharge of liquid sodium into the high-temperature zone through the six first discharge channels 225 after passing through the first mixing chamber 223. This allows other headers located around the first header 22 (including the second header 23 and the third header 25) to uniformly receive liquid sodium for redistribution.

[0127] Figure 4 yes Figure 1 A cross-sectional view of the second distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment. Figure 5 yes Figure 4 A cross-sectional view of the second sleeve of the core assembly coolant flow distribution device shown in the schematic embodiment.

[0128] According to embodiments of this disclosure, such as Figure 4 and Figure 5 As shown, the distribution mechanism 2 also includes a second sleeve 24 and a second header 23. The second sleeve 24 is installed within a portion of the through hole formed by the first flange 11. The second header 23 includes a second mounting portion 236, a plurality of second mounting holes 231, and a second mixing chamber 233. The second mounting portion 236 is located at the lower end of the second header 23 and is configured to fit inside the second sleeve 24 to limit the position of the second header 23 relative to the second sleeve 24. The plurality of second mounting holes 231 are formed at the upper end of the second header 23 and extend in a direction orthogonal to the first flange 11, and are configured to fit with the core assembly to limit the position of the core assembly relative to the second header 23. The second mixing chamber 233 is formed below and communicates with the plurality of second mounting holes 231. The sidewall of the second mixing chamber 233 is provided with a plurality of guide holes communicating with the high-temperature zone, so that the coolant located in the high-temperature zone is distributed from the second mixing chamber 233 to each second mounting hole 231.

[0129] According to embodiments of this disclosure, such as Figure 4 and Figure 5 As shown, one of the plurality of second assembly holes 231 is located in the middle of the second header 23, and the other plurality of second assembly holes 231 are spaced apart around the second assembly hole 231 located in the middle. The second header 23 also includes a plurality of second exhaust channels 234 and a second exhaust port. The plurality of second exhaust channels 234 are located below each of the second assembly holes 231 located on the outer side, and are configured to communicate the second mixing chamber 233 with the high-temperature zone, so that a portion of the coolant is discharged to the high-temperature zone. The second exhaust port is located below the second assembly hole 231 located in the middle, and is configured to communicate with the high-temperature zone, so that the gas in the second exhaust port can be discharged to the high-temperature zone.

[0130] According to embodiments of this disclosure, such as Figure 4 and Figure 5 As shown, the second sleeve 24 and the second mounting part 236 are assembled by a threaded connector, so that the second header 23 is held on the second sleeve 24.

[0131] In one illustrative embodiment, such as Figure 4 and Figure 5 As shown, the second header 23 includes a housing and multiple modules formed within the housing and integrally formed with the housing.

[0132] In detail, the multiple modules include a central module disposed in the middle of the housing, and multiple side modules evenly spaced and formed on the circumferential outer side of the central module.

[0133] Furthermore, a flow channel 224 is formed between adjacent side modules, which is connected to the coolant inlet 211.

[0134] In one illustrative embodiment, such as Figure 4 As shown, a second mounting hole 231 is provided on the upper surface of the central module and each side module.

[0135] In detail, the second mounting hole 231 is along the vertical direction (e.g., Figure 4 (Extends in the upward and downward directions as shown).

[0136] Furthermore, to meet the assembly requirements of the core assembly, a flange adapted to the size and shape of the core assembly is provided in the second assembly hole 231.

[0137] Furthermore, to prevent misinsertion of different core components, at least one of the positions, sizes, and shapes of the flanges provided in a portion of the second assembly holes 231 may be configured to differ from other second assembly holes 231 (e.g., Figure 4 The three second assembly holes 231 shown are all different.

[0138] In one illustrative embodiment, such as Figure 4 As shown, the second header 23 is provided with a second mixing chamber 233 located below the plurality of second assembly holes 231.

[0139] In detail, the second mixing chamber 233 extends horizontally (e.g. Figure 4 (as shown in the horizontal direction).

[0140] Furthermore, the shape of the second mixing cavity 233 matches the cross-sectional shape of the second header 23 (including but not limited to being constructed as at least one of a circle, ellipse, polygon, and polygon-like shape).

[0141] In one illustrative embodiment, a second outflow channel 234 is provided directly below the second mixing chamber 233 for a plurality of second assembly holes 231 formed on the edge of the second header 23.

[0142] Furthermore, a second exhaust port is provided directly below the second mixing chamber 233 in the second assembly hole 231 formed in the middle of the second header 23.

[0143] Furthermore, the lower end of the second exhaust port extends toward the side wall of the second header 23 to form a plurality of exhaust channels 235, and the end of the exhaust channel 235 that is close to the second exhaust port (located in the middle of the second header 23) is higher than the end that is far from the second exhaust port (located outside the second header 23).

[0144] In one illustrative embodiment, the second header 23 is configured as a polygonal structure.

[0145] In detail, the second header 23 is constructed as a hexagonal structure with a shape that is approximately the same as that of the first header 22.

[0146] Furthermore, the second manifold 23 includes a shell configured as a hexagon, a central module configured as a columnar structure, and multiple six-sided modules configured as fan-shaped structures.

[0147] Furthermore, a second mounting hole 231 is formed at the upper end of the central module and the six side modules. It should be understood that the embodiments of this disclosure are not limited thereto.

[0148] For example, the shell of the second compartment 23 can be constructed as a triangular, quadrilateral, pentagonal, heptagonal, or other polygonal or polygon-like structure.

[0149] In this implementation, the second header 23 is constructed as a hexagonal structure that is both centrally symmetric and axially symmetric. This facilitates the uniform discharge of sodium liquid into the high-temperature zone through the six second discharge channels 234 after passing through the second mixing chamber 233. This allows other headers located around the second header 23 (including other second headers 23 and the third header 25) to uniformly receive liquid sodium for redistribution.

[0150] In one illustrative embodiment, such as Figure 4 As shown, a second guide plate 232 may be provided on the upper and / or lower part of the second mixing chamber 233.

[0151] In detail, the second guide plate 232 is provided with guide holes offset radially from the second external discharge channel 234 and the second assembly hole 231. This allows for changes in flow rate and velocity of the molten sodium during its diffusion within the second header 23, resulting in more uniform distribution and a more stable flow rate of the molten sodium as it enters the core assembly and / or the high-temperature zone.

[0152] In one illustrative embodiment, such as Figure 4 and Figure 5As shown, the inner edge of the second sleeve 24 is constructed as a stepped flange.

[0153] Specifically, a threaded hole is provided below the flange, which coincides with the extension direction of the flange's axis.

[0154] Furthermore, the second mounting portion 236 of the second header 23 is provided with a mating flange for engaging with the flange.

[0155] Furthermore, in conjunction with the drawing, another threaded hole with the same diameter as the threaded hole is provided inside the drawing.

[0156] Furthermore, threaded connections include, but are not limited to, connections using a second bolt 43.

[0157] Figure 6 yes Figure 1 A cross-sectional view of the third distribution component of the reactor core assembly coolant flow distribution device shown in the schematic embodiment. Figure 7 yes Figure 6 A cross-sectional view of the third sleeve of the core assembly coolant flow distribution device shown in the schematic embodiment.

[0158] According to embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, the distribution mechanism 2 also includes multiple third distribution components, each including a third sleeve 26 and a third header 25. The third sleeve 26 is installed within a portion of the through hole formed by the first flange 11. The third header 25 includes a third mounting portion, a third assembly hole 251, and a third mixing chamber 252. The third mounting portion, located at the lower end of the third header 25, is configured to fit inside the third sleeve 26 to limit the position of the third header 25 relative to the third sleeve 26. The third assembly hole 251 is formed at the upper end of the third header 25 and extends in a direction orthogonal to the first flange 11, configured to fit with the core assembly to limit the position of the core assembly relative to the third header. The third mixing chamber 252 is formed below and communicates with the third assembly hole 251. The sidewall of the third mixing chamber 252 is provided with multiple guide holes communicating with the high-temperature zone, allowing coolant located in the high-temperature zone to enter the third assembly hole 251 through the third mixing chamber 252.

[0159] According to embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, the third manifold 25 also includes a third exhaust channel 253 disposed on the side wall between the third mixing chamber 252 and the third mounting part. A third exhaust hole 254 communicating with the high temperature zone is disposed on the side wall of the third exhaust channel 253, so that the gas in the third exhaust channel 253 can be discharged to the high temperature zone.

[0160] According to embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, the third sleeve 26 and the third mounting part are assembled by a threaded connector, so that the third header 25 is held on the third sleeve 26.

[0161] In one illustrative embodiment, such as Figure 6 and Figure 7 As shown, the inner edge of the third sleeve 26 is constructed as a stepped flange.

[0162] Specifically, a threaded hole is provided below the flange, which coincides with the extension direction of the flange's axis.

[0163] Furthermore, the third mounting portion of the third header 25 is provided with a mating flange for engaging with the flange.

[0164] Furthermore, in conjunction with the drawing, another threaded hole with the same diameter as the threaded hole is provided inside the drawing.

[0165] Furthermore, threaded connections include, but are not limited to, connections using a third bolt 44.

[0166] Figure 8 yes Figure 1 A schematic diagram of the through-hole arrangement of the first flange of the core assembly coolant flow distribution device in the illustrated embodiment.

[0167] In one illustrative embodiment, such as Figure 8 As shown, the first flange 11 of the mounting mechanism 1 has, but is not limited to, a plurality of through holes evenly arranged.

[0168] In detail, the first flange 11 is arranged in a horizontal direction.

[0169] Furthermore, through holes are formed vertically on the first flange 11, and one of the first sleeve 21, the second sleeve 24, and the third sleeve 26 is installed in each through hole.

[0170] In this embodiment, by installing the first sleeve 21 and / or the second sleeve 24 and the first header 22 and the second header 23 that are installed in cooperation, a through hole can restrict multiple core assemblies, which helps to reduce the number of openings on the first flange 11, facilitates the improvement of the rigidity of the first flange 11 and reduces the manufacturing difficulty.

[0171] Figure 9 yes Figure 1 A schematic diagram of the arrangement of the distribution mechanism 2 of the core assembly coolant flow distribution device in the illustrated embodiment. Figure 10 yes Figure 9 A partially enlarged view of part A of the core assembly coolant flow distribution device in the schematic embodiment shown.

[0172] In one illustrative embodiment, such as Figure 9 As shown, by installing different headers (including but not limited to the first header 22, the second header 23, and the third header 25) in the first flange 11, different core assembly installation requirements can be accommodated. This makes the core formed by multiple core assemblies highly flexible.

[0173] In detail, such as Figure 10 As shown, different headers (including but not limited to the first header 22, the second header 23 and the third header 25) can be installed according to the different positions of the through holes provided on the first flange 11.

[0174] For example, a first header 22 is set in the middle of a certain area, a second header 23 is set around the first header 22, and a third header 25 is used to fill the edge of the first flange 11.

[0175] Figure 11 This is an exploded view of the components of a reactor core support system according to an illustrative embodiment of the present invention.

[0176] This invention provides a core support system, such as Figure 11 As shown, the device includes a core assembly coolant flow distribution device, a restraint device 6, and an annular compensator 5. The core assembly coolant flow distribution device is configured to detachably mount multiple core assemblies. The restraint device 6 is mounted above the core assembly coolant flow distribution device and sleeved on the outer side of the multiple outer core assemblies to limit the radial position of the core assemblies relative to the core assembly coolant flow distribution device. The annular compensator 5 is installed between the distribution device and the restraint device 6 to limit the displacement of the distribution device relative to the restraint device 6.

[0177] In this embodiment, the restraint device 6 is used to abut against the outer surface of the core assembly to restrict the core in the radial direction along the restraint device 6. The core assembly coolant flow distribution device is used to communicate with an external sodium source to distribute the sodium liquid supplied by the sodium source into the core assembly. The annular compensation member 5 cooperates with the core assembly coolant flow distribution device to separate the low-temperature zone and the high-temperature zone, and compensates for the displacement between the core assembly coolant flow distribution device and the restraint device 6 caused by thermal expansion.

[0178] Figure 12 yes Figure 11 A cross-sectional view of the constraint device 6 of the core support system of the schematic embodiment shown.

[0179] According to embodiments of this disclosure, such as Figure 12As shown, the restraint device 6 includes a confining cylinder 65 and a plurality of confining plates 61. The confining cylinder 65 is configured as a cylindrical structure and is detachably mounted above the first flange 11 of the core assembly coolant flow distribution device. The plurality of confining plates 61 are arranged around the confining cylinder 65 and are configured to abut against the outer sides of the plurality of core assemblies located on the outer side to restrict the radial position of the plurality of core assemblies relative to the core assembly coolant flow distribution device. An annular compensator 5 is installed between the distribution device and the restraint device 6 to restrict the displacement of the distribution device relative to the restraint device 6.

[0180] In one illustrative embodiment, such as Figure 12 As shown, the circumferential tube 65 is constructed as a cylindrical structure.

[0181] In detail, the upper and lower parts of the inner wall of the casing 65 are provided with inward protrusions, and a casing plate 61 is installed between the two protrusions.

[0182] Furthermore, a polygonal region is defined between the plurality of enclosures 61 to constrain the exterior of the core assembly within that region.

[0183] In detail, the outer wall surface of the core assembly adjacent to the enclosure 61 abuts against the enclosure 61, so that the core assembly and the enclosure 61 are in the same shape.

[0184] In one illustrative embodiment, the upper end of the inner surface of the enclosure 61 is provided with a horizontally extending protrusion 68 for abutting against the upper part of the outer wall of the core assembly.

[0185] In detail, the protrusion 68 is, but is not limited to, being fixed to the enclosure 61 with screws.

[0186] In one illustrative embodiment, such as Figure 12 As shown, multiple sodium inlets 67 for natural circulation within the pile are evenly spaced on the enclosure plate 61.

[0187] In detail, the number and size of the sodium inlets 67 are set according to the flow rate required for natural circulation.

[0188] In one illustrative embodiment, such as Figure 12 As shown, the end of the circumferential cylinder 65 facing the elevator (e.g.) Figure 12 The right end shown is constructed as a flat-walled structure.

[0189] In detail, this part of the shroud 65 is constructed as a complete planar structure. This allows for a closer contact between the shroud 65 and the hoist during assembly, which facilitates smoother lifting and lowering of the shroud 65.

[0190] Furthermore, the upper end of the outer wall surface of the coffered tube 65 forming a flat-walled structure (such as...) Figure 12 The upper right end (as shown) is provided with a support plate 62 for assembly with the hoist (e.g., Figure 12 (Set horizontally), stiffening ribs (such as those provided between the support plate 62 and the outer wall of the casing 65) are provided to enhance structural rigidity. Figure 12 (Set along the vertical direction).

[0191] Furthermore, the outer wall of the casing 65, which forms a flat-wall structure, is provided with a lower end 63 located below the support plate 62 for cooperating with the unloading machine guide rail.

[0192] In one illustrative embodiment, such as Figure 12 As shown, a neutron injection channel 64 for injecting neutrons is provided at the elevation position of the core of the side wall forming the flat wall structure of the casing 65.

[0193] In detail, the neutron injection channel 64 is configured as a square hole.

[0194] In one illustrative embodiment, such as Figure 12 As shown, the lower part of the casing 65 forms an inner flange 66 for assembly with the core assembly coolant flow distribution device.

[0195] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of the present invention. Throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding the present invention.

[0196] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A reactor core assembly coolant flow distribution device, characterized in that, include: Installation mechanism (1) includes: The first flange has multiple through holes; The second flange (15) is arranged parallel to and spaced below the first flange; A cylindrical portion (12) is disposed between the first flange and the second flange (15). A low-temperature zone for introducing coolant is defined between the first flange, the second flange (15) and the cylindrical portion (12). A high-temperature zone for introducing the coolant into the core assembly to cool the core assembly is defined above the first flange. The distribution mechanism (2) is installed in the through hole formed by the first flange. The part of the distribution mechanism (2) located inside the high temperature zone is configured to be assembled with the core assembly. The part of the distribution mechanism (2) located inside the low temperature zone is configured to communicate with the low temperature zone so as to guide and distribute the coolant to the core assembly at different locations in the high temperature zone, thereby cooling the core assembly. The installation mechanism (1) further includes a flow equalization plate (14) disposed between the first flange and the second flange (15) and located inside the cylindrical part (12). The flow equalization plate (14) is constructed as a cylindrical structure and is provided with a plurality of flow equalization holes that extend in the radial direction. The distribution mechanism (2) includes a plurality of first distribution components, the first distribution components including: The first sleeve (21) is installed in a portion of the through hole formed by the first flange. The portion of the first sleeve (21) located below the first flange is provided with a coolant inlet (211) that communicates with the low-temperature zone. The first header (22) includes: The first mounting part (226) is disposed at the lower end of the first header (22) and is configured to fit into the interior of the first sleeve (21) to limit the position of the first header (22) relative to the first sleeve (21); A first mounting hole (221), formed at the upper end of the first header (22) and extending in a direction orthogonal to the first flange, is configured to engage with the core assembly to restrict the position of the core assembly relative to the first header (22); and A flow channel (224) is formed in the first header (22) between the coolant inlet (211) and the first assembly hole (221), and is configured to communicate the coolant inlet (211) and the first assembly hole (221) so that the coolant is input into the core assembly installed in the first assembly hole (221) via the flow channel (224); The first header (22) includes a plurality of first mounting holes (221) evenly spaced apart; The first header (22) also includes: A first mixing chamber (223) is formed between a plurality of first mounting holes (221) and the flow channel (224), and is configured to communicate the flow channel (224) with each of the first mounting holes (221) such that a portion of the coolant input through the flow channel (224) is distributed into each of the first mounting holes (221); The lower part of the first sleeve (21) is mounted on the second flange (15) and is configured to communicate with the main container cooling zone below the second flange (15); One of the plurality of first assembly holes (221) is located in the middle of the first header (22), and the other plurality of first assembly holes (221) are spaced apart around the first assembly hole (221) located in the middle; The first header (22) also includes: Multiple first external discharge channels (225), disposed below each of the first assembly holes (221) located on the outer side, are configured to communicate the first mixing chamber (223) with the high-temperature zone, such that a portion of the coolant is discharged into the high-temperature zone; and The first exhaust port is located below the first assembly hole (221) in the middle and is configured to communicate with the lower part of the first sleeve (21) so that the gas in the first exhaust port can be discharged to the main container cooling zone. A first guide plate is disposed at the upper and / or lower part of the first mixing chamber and is configured to have guide holes offset from the radial position of the first discharge channel and the first assembly hole.

2. The apparatus according to claim 1, characterized in that, The first sleeve (21) includes: The funnel-shaped portion (212) is configured as a funnel-shaped structure, and a plurality of coolant inlets (211) are evenly spaced on the sidewall of the funnel-shaped portion (212); and The first tubular portion (213) is integrally disposed at the lower end of the bucket-shaped portion (212), extends along a direction orthogonal to the second flange (15), and is installed on the second flange (15).

3. The apparatus according to claim 2, characterized in that, The first mounting part (226) includes a second tubular part (2261), which is sleeved inside the first tubular part (213) and communicates with the first tubular part (213); The portion of the first tubular portion (213) located inside the second tubular portion (2261) is assembled with the second tubular portion (2261) by a hoop connector (41), so that the first manifold (22) is held on the first sleeve (21).

4. The apparatus according to claim 1, characterized in that, It also includes a throttling pipe (3) disposed on the lower end face of the second flange (15) and configured to connect the low temperature zone and the main container cooling zone, so that the coolant is output from the low temperature zone to the main container cooling zone to cool the main container cooling device in the main container cooling zone.

5. The apparatus according to claim 1, characterized in that, The distribution mechanism (2) further includes a plurality of second distribution components, the second distribution components including: The second sleeve (24) is installed in a portion of the through hole formed by the first flange; The second compartment (23) includes: The second mounting part (236) is disposed at the lower end of the second header (23) and is configured to fit into the interior of the second sleeve (24) to limit the position of the second header (23) relative to the second sleeve (24); A plurality of second mounting holes (231) are formed at the upper end of the second header (23) and extend in a direction orthogonal to the first flange, configured to engage with the core assembly to restrict the position of the core assembly relative to the second header (23); and The second mixing chamber (233) is formed below and communicates with the plurality of second assembly holes (231). The sidewall of the second mixing chamber (233) is provided with a plurality of guide holes communicating with the high temperature zone, so that the coolant located in the high temperature zone is distributed to each of the second assembly holes (231) through the second mixing chamber (233).

6. The apparatus according to claim 5, characterized in that, One of the plurality of second mounting holes (231) is located in the middle of the second header (23), and the other plurality of second mounting holes (231) are spaced apart around the second mounting hole (231) located in the middle; The second header (23) also includes: Multiple second external discharge channels (234), located below each of the second assembly holes (231) on the outer side, are configured to communicate the second mixing chamber (233) with the high-temperature zone, allowing a portion of the coolant to be discharged into the high-temperature zone; and The second vent is located below the second assembly hole (231) in the middle. The second vent is configured to communicate with the high-temperature zone so that the gas in the second vent can be discharged to the high-temperature zone.

7. The apparatus according to claim 5 or 6, characterized in that, The second sleeve (24) and the second mounting part (236) are assembled by a threaded connector, so that the second header (23) is held on the second sleeve (24).

8. The apparatus according to claim 1, characterized in that, The distribution mechanism (2) further includes a plurality of third distribution components, the third distribution components including: The third sleeve (26) is installed in a portion of the through hole formed by the first flange; The third container (25) includes: The third mounting part is provided at the lower end of the third header (25) and is configured to fit into the interior of the third sleeve (26) to limit the position of the third header (25) relative to the third sleeve (26); A third mounting hole (251), formed at the upper end of the third header (25) and extending in a direction orthogonal to the first flange, is configured to engage with the core assembly to restrict the position of the core assembly relative to the third header; and The third mixing chamber (252) is formed below the third assembly hole (251) and communicates with the third assembly hole (251). The side wall of the third mixing chamber (252) is provided with a plurality of guide holes communicating with the high temperature zone, so that the coolant located in the high temperature zone is input into the third assembly hole (251) through the third mixing chamber (252).

9. The apparatus according to claim 8, characterized in that, The third manifold (25) further includes a third exhaust channel (253) disposed on the side wall between the third mixing chamber (252) and the third mounting part. The side wall of the third exhaust channel (253) is provided with a third exhaust hole (254) communicating with the high temperature zone, so that the gas in the third exhaust channel (253) can be discharged to the high temperature zone.

10. The apparatus according to claim 8 or 9, characterized in that, The third sleeve (26) and the third mounting part are assembled by a threaded connector, so that the third header (25) is held on the third sleeve (26).

11. A reactor core support system, characterized in that, include: The core assembly coolant flow distribution device as described in any one of claims 1 to 10 is configured to detachably mount a plurality of core assemblies; A restraint device (6) is installed above the coolant flow distribution device of the core assembly and sleeved on the outside of the plurality of core assemblies located on the outside, so as to restrict the radial position of the core assembly relative to the coolant flow distribution device of the core assembly; as well as An annular compensation element (5) is installed between the distribution device and the constraint device (6) to limit the displacement of the distribution device relative to the constraint device (6).

12. The system according to claim 11, characterized in that, The restraint device (6) includes: A casing (65), configured as a cylindrical structure, is detachably mounted above the first flange of the core assembly coolant flow distribution device; and Multiple enclosures (61) are arranged around the top of the enclosure (65) and configured to abut against the outer side of the multiple core assemblies located on the outer side to limit the radial position of the multiple core assemblies relative to the core assembly coolant flow distribution device.

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