Shutdown device for achieving reactor shutdown

Abstract

Embodiments of the present application relate to the technical field of nuclear reactor design, and more specifically, to a shutdown device for achieving a reactor shutdown, comprising: a housing assembly, a connecting assembly, and a shutdown assembly. The housing assembly forms a housing cavity for accommodating the connecting assembly and the shutdown assembly, with the housing assembly partially disposed within the reactor core and partially disposed above the reactor core. The connecting assembly is configured to support the shutdown assembly during normal reactor operation to prevent the shutdown assembly from falling into the reactor core, and is configured to fall together with the shutdown assembly to fall into the core during a reactor shutdown. The shutdown assembly is configured to fall into the core during a reactor shutdown to achieve an emergency shutdown. The shutdown device of the present application embodiment does not rely on triggering of a shutdown signal or the actuation of active components, thereby facilitating the independent, rapid, and reliable completion of the shutdown function, thereby ensuring the safety and reliability of the reactor.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of nuclear reactor design, and in particular to a shutdown device for achieving reactor shutdown. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] A reactor is a device for utilizing nuclear energy. Relevant laws and regulations stipulate that a reactor should have the ability to shut down quickly under accident conditions to ensure its safety performance.

[0004] Currently, in order to achieve the rapid shutdown function of the reactor, a safety rod system specifically used for performing the rapid shutdown function of the reactor is usually provided in the reactor. However, the reliability of the current safety rod system is not ideal. Summary of the Invention

[0005] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description that will be discussed later.

[0006] An embodiment of the present application provides a shutdown device for achieving a reactor shutdown, which includes: a accommodating assembly, a connecting assembly, and a shutdown assembly. The accommodating assembly forms a accommodating cavity, the accommodating cavity is used to accommodate the connecting assembly and the shutdown assembly, and the accommodating assembly is partially arranged inside the core of the reactor, and the other part is arranged above the core of the reactor; the connecting assembly is arranged to support the shutdown assembly when the reactor is operating normally to prevent the shutdown assembly from falling into the core of the reactor, and is arranged to fall together with the shutdown assembly when the reactor is shut down to fall into the core; the shutdown assembly is arranged to fall into the core when the reactor is shut down to achieve an emergency shutdown.

[0007] The shutdown device of the embodiment of the present application realizes an emergency shutdown by configuring the connecting assembly to fall together with the shutdown assembly when the reactor is shut down. Compared with the traditional shutdown method, the shutdown method of the embodiment of the present application does not need to rely on the triggering of the shutdown signal or the driving of active components, which is conducive to achieving the purpose of independently, quickly and reliably completing the shutdown function to ensure the safety and reliability of the reactor.

[0008] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To further illustrate the above and other advantages and features of the present application, the following detailed description of specific embodiments of the present application is provided in conjunction with the accompanying drawings. The accompanying drawings, together with the detailed description below, are incorporated into and form a part of this specification. Elements with the same function and structure are denoted by the same reference numerals. It should be understood that these drawings depict only typical examples of the present application and should not be construed as limiting the scope of the present application.

[0010] Figure 1 is a schematic structural diagram of a shutdown device according to one embodiment of the present application;

[0011] Figure 2 yes Figure 1 A partial enlarged view of the shutdown device is shown;

[0012] Figure 3 It is a cross-sectional view along the radial direction of the connecting member according to one embodiment of the present application.

[0013] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0014] Description of reference numerals:

[0015] 10. Accommodation assembly; 101. First accommodation groove; 11. First accommodation body; 12. Second accommodation body; 13. Accommodation support member; 14. Sealing member; 15. Operating member;

[0016] 20. Connecting assembly; 21. Clamping assembly; 210. Second receiving groove; 211. Through-groove; 212. First clamping member; 2121. First clamping body; 2122. Second clamping body; 213. Second clamping member; 214. Positioning member; 215. Positioning mating portion; 22. Connecting member; 23. Buffering assembly; 231. First buffering member; 232. Elastic member; 233. Second buffering member; 24. Fixing member; 25. Gasket;

[0017] 30. Shutdown assembly; 31. Shutdown body; 321. First operating unit; 322. Second operating unit. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is a routine task for those skilled in the art who benefit from the content of this application.

[0019] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, the accompanying drawings only show the device structure and / or processing steps that are closely related to the solution according to the present application, while other details that are not closely related to the present application are omitted.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the common meanings understood by persons having ordinary skills in the field to which this application belongs.

[0021] In the description of the embodiments of the present application, “multiple” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] Current reactors typically utilize a safety rod system to rapidly shut down the reactor. Ensuring the reliability of this system is crucial to prevent its impact on the reactor's safety performance. Safety rod drop often relies on a shutdown signal to trigger the system. However, in the event of an abnormality, such as failure of the reactor's instrumentation and control system or active components, the shutdown signal may not be triggered or may not be triggered in time, preventing the safety rods from rapidly dropping, which in turn may affect the reactor's safety performance.

[0023] In response to the above technical problems, an embodiment of the present application provides a shutdown device for achieving reactor shutdown. Figure 1 FIG. 1 is a schematic structural diagram of a shutdown device according to an embodiment of the present application. Figure 1 As shown, the shutdown device may include a receiving assembly 10 , a connecting assembly 20 and a shutdown assembly 30 .

[0024] The containment assembly 10 is formed with a containment cavity for accommodating the connection assembly 20 and the shutdown assembly 30 , and a portion of the containment assembly 10 is disposed inside the core of the reactor, and another portion is disposed above the core of the reactor.

[0025] The connection assembly 20 is configured to support the shutdown assembly 30 when the reactor is operating normally to prevent the shutdown assembly 30 from falling into the reactor core, and is configured to fall together with the shutdown assembly 30 to fall into the reactor core when the reactor is shut down.

[0026] The shutdown assembly 30 is configured to drop into the core when the reactor is shut down to achieve an emergency shutdown.

[0027] The shutdown device of the embodiment of the present application realizes an emergency shutdown by configuring the connecting assembly 20 so that it can fall together with the shutdown assembly 30 when the reactor is shut down. Compared with the traditional shutdown method, the shutdown method of the embodiment of the present application does not need to rely on the triggering of the shutdown signal or the driving of active components, which is conducive to achieving the purpose of independently, quickly and reliably completing the shutdown function to ensure the safety and reliability of the reactor.

[0028] In some embodiments, the containment assembly 10 in the embodiments of the present application can physically isolate the connection assembly 20 and the shutdown assembly 30 from the coolant to prevent the shutdown assembly 30 from being affected by the coolant during the falling process, thereby helping to improve the reliability of using the inherent gravity of the shutdown assembly 30 to achieve rod dropping.

[0029] In some embodiments, when the reactor is in normal operating conditions, the connection assembly 20 and the shutdown assembly 30 are positioned in the accommodating cavity above the core of the reactor. When the reactor is in a shutdown condition, the connection assembly 20 and the shutdown assembly 30 can fall by gravity and fall into the core of the reactor, thereby performing an emergency shutdown.

[0030] In some embodiments, the containment assembly 10 may include a first containment body 11, a second containment body 12, and a containment support 13. The first containment body 11 is connected to the second containment body 12, and the first containment body 11 is disposed above the reactor core, while the second containment body 12 is disposed within the reactor core. The first containment body 11 and the second containment body 12 together form a containment cavity. The connection between the first containment body 11 and the second containment body 12 forms a first containment groove 101. A portion of the containment support 13 is disposed within the first containment groove 101, and another portion protrudes outwardly along the opening direction of the first containment groove 101 to form a protrusion. The protrusion of the containment support 13 is used to support the connection assembly 20.

[0031] The embodiment of the present application facilitates the installation of the connection assembly 20 and the shutdown assembly 30 by configuring the containment assembly 10 to include a first containment body 11, a second containment body 12, and a containment support 13. At the same time, the containment support 13 is used to support the connection assembly 20, so that the connection assembly 20 can stably support the shutdown assembly 30 when the reactor is in normal operating conditions.

[0032] In some embodiments, the first accommodating body 11 , the second accommodating body 12 and the accommodating support 13 may be made of stainless steel.

[0033] In some embodiments, the first accommodating body 11 and the second accommodating body 12 may be cylindrical structures with openings at both ends. For example, the first accommodating body 11 and the second accommodating body 12 may be two sleeves with the same inner diameter.

[0034] In some embodiments, the first accommodating body 11 and the second accommodating body 12 can be fixedly connected by welding.

[0035] In some embodiments, the accommodating support 13 can be a metal ring, and the height of the metal ring matches the height of the groove wall of the first accommodating groove 101 formed at the connection between the first accommodating body 11 and the second accommodating body 12, so as to be exactly stuck between the first accommodating body 11 and the second accommodating body 12.

[0036] In some embodiments, the inner diameter of the first accommodating body 11 and the inner diameter of the second accommodating body 12 are slightly larger than the outer diameter of the accommodating support 13, so that the first accommodating body 11, the accommodating support 13 and the second accommodating body 12 can be nested together to form an integral structure.

[0037] In some embodiments, Figure 2 yes Figure 1 The partial enlarged view of the shutdown device shown in Figure 2 As shown, the connection assembly 20 may include a clamping assembly 21, a connector 22, and a buffer assembly 23. The size of the clamping assembly 21 is set to be smaller than the size of the accommodating cavity. The clamping assembly 21 is used to clamp the connector 22 so that one end of the connector 22 is supported on the protrusion of the accommodating support member 13 and abuts against the inner wall of the first accommodating body 11; and the clamping assembly 21 is formed with a through groove 211, which is used to accommodate part of the shutdown assembly 30 to provide support for the shutdown assembly 30, so that the shutdown assembly 30 can be located above the core of the reactor; one end of the buffer assembly 23 is connected to the clamping assembly 21, and the other end is set as a free end, and the buffer assembly 23 is provided with a plurality of holes. The size of the punch assembly 23 is set to be smaller than the size of the accommodating cavity; the connecting member 22 is set to: when the temperature does not reach the predetermined temperature, the clamping assembly 21 and the buffer assembly 23 are located above the core of the reactor, so that the shutdown assembly 30 is located above the reactor, and when the temperature reaches the predetermined temperature, it quickly melts to disconnect from the accommodating support member 13, so that the shutdown assembly 30, the clamping assembly 21 and the buffer assembly 23 fall into the core of the reactor as a whole; and the position of the connecting member 22 in the accommodating cavity is set to be at the core outlet of the reactor.

[0038] When the reactor is in a shutdown state, the temperature of the core coolant outlet may rise. The coolant temperature is conducted through the containment assembly 10 to the connector 22 inside the containment chamber, causing the temperature of the connector 22 to rise rapidly. When the temperature reaches a predetermined temperature, the connector 22 will quickly melt. The predetermined temperature may be the temperature corresponding to the melting point of the connector 22.

[0039] In the embodiment of the present application, the clamping assembly 21 clamps the connecting member 22, so that when the temperature does not reach the predetermined temperature, the clamping assembly 21, the buffer assembly 23 and the shutdown assembly 30 can be kept above the core of the reactor to ensure the normal operation of the reactor. When the reactor is shut down, the temperature inside the reactor rises until the temperature reaches the predetermined temperature. The connecting member 22 melts, so that the clamping assembly 21 loses its support, so that the clamping assembly 21, the buffer assembly 23 and the shutdown assembly 30 can fall into the core of the reactor as a whole to ensure the safety of the reactor under the shutdown condition. At the same time, the buffer assembly 23 is used to provide a buffer for the clamping assembly 21 and the shutdown assembly 30 during the falling process, so as to prevent the shutdown assembly 30 from tilting.

[0040] In some embodiments, the connector 22 can be configured to have a specific size so that its edge can fall between the inner diameter of the accommodating support 13 and the inner diameter of the first accommodating body 11 , so that it can be accommodated in the accommodating cavity and can rest on the upper surface of the accommodating support 13 .

[0041] In some embodiments, the position of the connector 22 in the containment cavity is set to be at the core outlet of the reactor, and part of the first containment body 11 at this position is set to be able to directly contact the coolant, so that the connector 22 can respond to changes in the core outlet temperature in a timely manner, so that it can quickly melt when the temperature rises due to reactor shutdown, so that the shutdown assembly 30 falls into the core.

[0042] In some embodiments, the connector 22 should be made of a material with a certain structural strength and a melting point slightly above the primary core outlet temperature to ensure that the connector 22 does not melt during normal reactor operation and can respond promptly in the event of an accident. The material for the connector 22 can be selected based on the reactor type and design parameters.

[0043] In some embodiments, the clamping assembly 21 includes a first clamping member 212 and a second clamping member 213; the first clamping member 212 includes a first clamping body 2121 and a second clamping body 2122, the first clamping body 2121 and the second clamping body 2122 are fixedly connected to provide support for the shutdown assembly 30; the second clamping body 2122 is formed with a through groove 211, and the extension direction of the through groove 211 is perpendicular to the radial direction of the accommodating assembly 10, for accommodating part of the shutdown assembly 30 The second clamping member 213 is arranged below the first clamping body 2121 and is located radially outward of the second clamping body 2122, and is used to form a second receiving groove 210 together with the first clamping body 2121 and the second clamping body 2122. The opening of the second receiving groove 210 faces the accommodating support member 13; the connecting member 22 is arranged in the second receiving groove 210 so that the first clamping body 2121, the second clamping body 2122 and the second clamping member 213 can jointly clamp the connecting member 22.

[0044] The embodiment of the present application can provide support for the shutdown assembly 30 while clamping the connector 22 through the first clamping member 212 and the second clamping member 213. The structure is relatively simple, which is conducive to the connector 22 being able to fall smoothly and quickly into the core when it melts.

[0045] In some embodiments, the first clamping body 2121 and the second clamping body 2122 can be an integral piece.

[0046] In some embodiments, the first clamping body 2121 is configured to support the shutdown assembly 30 through the first clamping body 2121 and to accommodate a portion of the structure of the shutdown assembly 30 through the second clamping body 2122 , so that the shutdown assembly 30 can be fixed.

[0047] In some embodiments, the second clamping member 213 is arranged below the first clamping body 2121 and is located radially outward of the second clamping body 2122. It can also limit the first clamping member 212, which is beneficial to prevent the overall structure from loosening due to the gap generated when the connecting member 22 is melted, thereby avoiding affecting the buffering effect of the buffer assembly 23.

[0048] In some embodiments, Figure 3 is a cross-sectional view along the radial direction of the connecting member 22 according to an embodiment of the present application, as shown in FIG. Figure 3 As shown, the first clamping body 2121 and the second clamping member 213 are respectively formed with a plurality of positioning fitting portions 215 along the circumferential direction of the through groove 211, and the positioning fitting portions 215 on the first clamping body 2121 are arranged opposite to the positioning fitting portions 215 on the second clamping member 213; the clamping assembly 21 may also include a positioning member 214 for cooperating with the positioning fitting portions 215 to position the connecting member 22.

[0049] In the embodiment of the present application, the first clamping body 2121 of the first clamping member 212, the second clamping member 213 and the connecting member 22 can be positioned through the mutual cooperation between the positioning member 214 and the positioning matching portion 215, so that the connecting member 22 can stably connect the first clamping member 212 and the second clamping member 213, which is beneficial to ensuring the stability of the overall structure of the first clamping member 212, the second clamping member 213, the buffer assembly 23 and the shutdown assembly 30.

[0050] In some embodiments, the connecting assembly 20 may include a plurality of connecting members 22. The number of the positioning matching portions 215 corresponds to the number of the positioning members 214, so as to respectively position the plurality of connecting members 22 located in the second receiving groove 210. Figure 3 In the illustrated embodiment, the connecting assembly 20 may include six connecting members 22 , and the six connecting members 22 are evenly arranged in the second receiving groove 210 , and each connecting member 22 is positioned between the second clamping member 213 and the first clamping body 2121 by a positioning member 214 .

[0051] In some embodiments, the positioning member 214 may be made of stainless steel and may be used to radially position the connecting member 22 .

[0052] In some embodiments, the positioning fitting portion 215 may be a positioning hole, and the positioning member 214 may be a positioning pin.

[0053] In some embodiments, the first clamping member 212 and the second clamping member 213 can provide axial positioning for the connecting member 22 , and the positioning pin can provide radial positioning for the connecting member 22 to ensure that the connecting member 22 is in the correct position.

[0054] In some embodiments, each positioning member 214 may pass through the first clamping body 2121 , the connecting member 22 , and the second clamping member 213 in sequence.

[0055] In some embodiments, the bottom of one end of the first clamping body 2121 facing the inner wall of the first accommodating body 11 is configured to have a chamfer to avoid being stuck with the accommodating support 13 during the falling process.

[0056] In some embodiments, the bottom of the outer edge of the first clamping body 2121 may be chamfered.

[0057] In some embodiments, as Figure 1 and Figure 2As shown, the shutdown assembly 30 may include a shutdown body 31, a first operating portion 321, and a second operating portion 322. The first operating portion 321 and the second operating portion 322 are disposed oppositely at opposite ends of the shutdown body 31 and are respectively fixedly connected to the shutdown body 31. The first operating portion 321 and the second operating portion 322 are smaller than the shutdown body 31. The first operating portion 321 is configured to extend into the through-slot 211 of the clamping assembly 21 and to be detachably connected to the buffer assembly 23. The second operating portion 322 is configured to be remotely operated. The shutdown body 31 is configured to absorb core neutrons after descending into the reactor core, thereby achieving an emergency shutdown.

[0058] In the embodiment of the present application, the mutual cooperation between the shutdown body 31, the first operating part 321 and the second operating part 322 can facilitate the operating device to grasp the shutdown body 31 through the second operating part 322 to facilitate the installation of the shutdown body 31. At the same time, the cooperation between the first operating part 321 and the clamping assembly 21 is conducive to the stable installation of the operating body in the accommodating cavity.

[0059] In some embodiments, the shutdown body 31 may be an absorber, and the material of the absorber may be boron carbide.

[0060] In some embodiments, the absorbent body may be a single absorbent rod with a larger diameter, or may be composed of a plurality of absorbent rods with smaller diameters.

[0061] In some embodiments, the connecting assembly 20 may include a fixing member 24 detachably connected to the first operating portion 321 to fix the clamping assembly 21 and the connecting member 22 as a whole between the shutdown body 31 and the fixing member 24 .

[0062] In some embodiments, the fixing member 24 may be a nut.

[0063] In some embodiments, the connecting assembly 20 may further include a gasket 25 . The fixing member 24 is detachably connected to the first operating portion 321 via the gasket 25 .

[0064] In some embodiments, as Figure 2 As shown, the buffer assembly 23 may include a first buffer member 231, an elastic member 232, and a second buffer member 233. The first buffer member 231 is disposed at one end of the elastic member 232 and located between the clamping assembly 21 and the elastic member 232, and is used to connect the elastic member 232 to the clamping assembly 21. The second buffer member 233 is disposed at the other end of the elastic member 232 and is used to provide support for the elastic member 232 during a fall to prevent the elastic member 232 from tipping over. The elastic member 232 is used to provide a buffer during the fall to prevent the shutdown assembly 30 from rebounding or being damaged.

[0065] The first buffer member 231 and the second buffer member 233 of the embodiment of the present application can ensure that the shutdown assembly 30 and the connecting assembly 20 have a larger contact area with the core when they fall into the core during the falling process, which is conducive to maintaining stability. At the same time, the first buffer member 231 is used to connect the elastic member 232 clamping assembly 21, which can provide cushioning when falling and contacting the bottom of the core, which is conducive to preventing the shutdown assembly 30 from rebounding or being damaged.

[0066] In some embodiments, the elastic member 232 may be a spring.

[0067] In some embodiments, the accommodating assembly 10 may further include a sealing member 14 , which is connected to an end of the second accommodating body 12 away from the first accommodating body 11 to seal the accommodating cavity.

[0068] In some embodiments, the seal 14 may be made of stainless steel. By connecting the seal 14 to the end of the second containment body 12 away from the first containment body 11, the first containment body 11 and the second containment body 12 can be stably installed at the bottom of the reactor core.

[0069] In some embodiments, the sealing member 14 and the end of the second accommodating body 12 away from the first accommodating body 11 may be fixedly connected by welding.

[0070] In some embodiments, the accommodating assembly 10 may further include an operating member 15 , which is fixedly connected to an end of the first accommodating body 11 away from the second accommodating body 12 and is configured to be remotely operated to connect the first accommodating body 11 with the second accommodating body 12 .

[0071] In some embodiments, the operating member 15 may be made of stainless steel and have an outer diameter slightly larger than that of the first receiving body 11 , so that the operating member 15 can grasp the first receiving body 11 and connect the first receiving body 11 to the second receiving body 12 .

[0072] In some embodiments, during the processing, the operating member 15 and the first receiving body 11 can be integrally formed.

[0073] In some embodiments, the operating member 15 can be configured to have an opening, and the opening is connected to the containment cavity, which can effectively isolate the reactor primary coolant and help prevent the primary coolant from causing flow-induced vibration, buoyancy, corrosion, etc. on the containment assembly 10.

[0074] In some embodiments, if the core of the reactor is composed of components of other shapes than those in the embodiment of the present application (for example, hexagonal), the outer shapes of the containing assembly 10 and the connecting assembly 20 can be adjusted to a hexagonal shape as needed.

[0075] The following describes in detail the assembly process of the shutdown device based on a specific embodiment of the present application.

[0076] In the first step, the second containing body 12 and the sealing member 14 are welded, and then the containing support 13 is placed on the end of the second containing body 12 away from the sealing member 14 , and then the first containing body 11 and the second containing body 12 are welded.

[0077] In the second step, the first clamping member 212, the connecting member 22, the second clamping member 213, the first buffer member 231, the elastic member 232 and the gasket 25 are sequentially installed on the first operating part 321 connected to the shutdown body 31 and fixed with the fixing member 24 (nut).

[0078] In the third step, the operating device is used to grab the second operating portion 322 connected to the shutdown body 31 to accommodate the entire structure assembled in the second step into the cavity and ensure that the connecting member 22 can be supported on the accommodating support member 13.

[0079] In the fourth step, the operating device is used to grab the operating member 15 connected to the first containing body 11 to install the entire structure assembled in the third step into the reactor.

[0080] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0081] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A shutdown device for achieving reactor shutdown, characterized in that: It includes: containment components, connection components and shutdown components, The accommodating assembly is formed with an accommodating cavity for accommodating the connecting assembly and the shutdown assembly, and the accommodating assembly is partially disposed inside the core of the reactor and another portion is disposed above the core of the reactor; The connection assembly is configured to support the shutdown assembly when the reactor is operating normally to prevent the shutdown assembly from falling into the reactor core, and is configured to fall together with the shutdown assembly to fall into the reactor core when the reactor is shut down; The shutdown assembly is configured to drop into the core when the reactor is shut down to achieve an emergency shutdown; The accommodating assembly includes a first accommodating body, a second accommodating body and an accommodating support member; The first containing body is connected to the second containing body, and the first containing body is arranged above the core of the reactor, and the second containing body is arranged inside the core of the reactor; The first accommodating body and the second accommodating body together form the accommodating cavity; The connecting assembly includes a clamping assembly, a connecting piece and a buffer assembly; The size of the clamping assembly is set to be smaller than the size of the accommodating cavity, and the clamping assembly is used to clamp the connecting member so that one end of the connecting member is supported on the protrusion of the accommodating support member and abuts against the inner wall of the first accommodating body; Furthermore, the clamping assembly is formed with a through slot, and the through slot is used to accommodate a portion of the shutdown assembly to provide support for the shutdown assembly, thereby enabling the shutdown assembly to be positioned above the core of the reactor; One end of the buffer assembly is connected to the clamping assembly, and the other end is configured as a free end, and the size of the buffer assembly is configured to be smaller than the size of the accommodating cavity; The connecting member is configured to: when the temperature does not reach a predetermined temperature, position the clamping assembly and the buffer assembly above the core of the reactor, thereby positioning the shutdown assembly above the reactor; and when the temperature reaches the predetermined temperature, quickly fuse to disconnect from the containment support member, thereby allowing the shutdown assembly, the clamping assembly, and the buffer assembly to fall entirely into the core of the reactor; Furthermore, the connection piece is positioned in the accommodation cavity at a position of a core outlet of the reactor.

2. The shutdown device according to claim 1, characterized in that: A first receiving groove is formed at the connection between the first receiving body and the second receiving body. A portion of the receiving support is arranged in the first receiving groove, and the other portion protrudes outward along the opening direction of the first receiving groove to form a protrusion. The protrusion of the receiving support is used to support the connecting component.

3. The shutdown device according to claim 1, characterized in that: The clamping assembly includes a first clamping member and a second clamping member; The first clamping member includes a first clamping body and a second clamping body, wherein the first clamping body is fixedly connected to the second clamping body and is used to provide support for the shutdown assembly; The second clamping body is formed with the through groove, and the extending direction of the through groove is perpendicular to the radial direction of the accommodating assembly, and is used to accommodate a portion of the shutdown assembly; The second clamping member is disposed below the first clamping body and located radially outward of the second clamping body, and is used to form a second receiving groove together with the first clamping body and the second clamping body, and the opening of the second receiving groove faces the accommodating support member; The connecting member is arranged in the second receiving groove, so that the first clamping body, the second clamping body and the second clamping member can clamp the connecting member together.

4. The shutdown device according to claim 3, characterized in that: The first clamping body and the second clamping member are respectively formed with a plurality of positioning matching portions along the circumferential direction of the through slot, and the positioning matching portions on the first clamping body are arranged opposite to the positioning matching portions on the second clamping member. The clamping assembly further includes a positioning member for cooperating with the positioning matching portion to position the connecting member.

5. The shutdown device according to claim 3, characterized in that: The bottom of one end of the first clamping body facing the inner wall of the first accommodating body is configured to have a chamfer to avoid being stuck with the accommodating support member during the falling process.

6. The shutdown device according to claim 1, characterized in that: The shutdown assembly includes a shutdown body, a first operating part and a second operating part. The first operating part and the second operating part are arranged at two ends of the shutdown body opposite to each other and are fixedly connected to the shutdown body respectively; The sizes of the first operating part and the second operating part are smaller than the size of the shutdown body; The first operating portion is used to extend into the through slot of the clamping assembly and be detachably connected to the buffer assembly; The second operating unit is configured to be remotely operated; The shutdown body is used to absorb core neutrons after falling into the core of the reactor, thereby achieving an emergency shutdown.

7. The shutdown device according to claim 6, characterized in that: The connecting assembly includes a fixing member, and the fixing member is detachably connected to the first operating portion to fix the clamping assembly and the connecting member as a whole between the shutdown body and the fixing member.

8. The shutdown device according to claim 7, characterized in that: The buffer assembly includes a first buffer member, an elastic member and a second buffer member; The first buffer member is provided at one end of the elastic member and is located between the clamping assembly and the elastic member, and is used to connect the elastic member to the clamping assembly; The second buffer member is provided at the other end of the elastic member and is used to provide support for the elastic member when falling to prevent the elastic member from tipping over; The elastic member is used to provide a buffer during the falling process to prevent the shutdown assembly from rebounding or being damaged.

9. The shutdown device according to claim 2, characterized in that: The receiving assembly includes a sealing member, The sealing member is connected to an end of the second accommodating body away from the first accommodating body to seal the accommodating cavity.

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