Cock assembly for reactor

Abstract

The embodiment of the invention relates to the technical field of nuclear reactors, in particular to a cock assembly for a reactor. The reactor comprises a reactor container and a reactor core assembly arranged in the reactor container, the reactor container comprises a container opening, and the reactor further comprises a refueling machine. The cock assembly comprises a first cock, a second cock and a third cock. The first cock is rotatably arranged at a container opening of a reactor container of a reactor, the first cock is provided with an eccentric first through hole, and the size of the first through hole is larger than the radius of the first cock. The second cock is arranged in the first through hole of the first cock and can rotate relative to the first cock, and the second cock is provided with an eccentric second through hole. The third cock is arranged in the second through hole of the second cock and can rotate relative to the second cock, and the third cock is provided with an eccentric third through hole. And the refueling machine is arranged in a third through hole of the third cock. According to the cock assembly, the moving range of the refueling machine can be increased, and the size of the first cock is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear reactors, and in particular to a plug assembly for a reactor. Background Art

[0002] This section of content merely provides background information related to the present application and does not necessarily constitute prior art.

[0003] In fast reactors, the plug assembly is the main refueling equipment installed on the reactor vessel, which can realize the positioning of the refueling machine and the core assembly, and cooperate with the refueling machine to complete the reversal of the internal components of the reactor vessel. At the same time, the plug assembly is installed on the reactor vessel, as part of the pressure boundary of the reactor vessel, it plays a role in sealing the reactor vessel and preventing the leakage of radioactive argon and sodium aerosols.

[0004] At present, there are still many problems in the design of the plug assembly, which affects the economic efficiency of the reactor. Summary of the invention

[0005] A brief overview of the present application is provided below in order 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 the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In view of the above technical problems, an embodiment of the present application provides a plug assembly for a reactor. The reactor may include a stack container, a core assembly arranged in the stack container, the stack container may include a container opening coaxial with the core assembly, and the reactor may also include a refueling machine. The plug assembly may include a first plug, a second plug, and a third plug. The first plug is rotatably arranged at the container opening of the stack container of the reactor, the first plug is provided with an eccentric first through hole, and the size of the first through hole is greater than the radius of the first plug. The second plug is arranged at the first through hole of the first plug and can rotate relative to the first plug, and the second plug is provided with an eccentric second through hole. The third plug is arranged at the second through hole of the second plug and can rotate relative to the second plug, and the third plug is provided with an eccentric third through hole. The refueling machine is arranged at the third through hole of the third plug.

[0007] The plug assembly provided in the embodiment of the present application is provided with three plugs, and the size of the first through hole is made larger than the radius of the first plug. Through the rotational cooperation of the three plugs, it is beneficial to increase the moving range of the material changer while reducing the size of the first plug.

[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] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0010] Figure 1 is a cross-sectional schematic diagram of a tap assembly according to an embodiment of the present application;

[0011] Figure 2 It is a schematic diagram of the distribution of three cocks;

[0012] Figure 3 yes Figure 1 A top view of the plug assembly with the control rod drive mechanism mounting socket omitted is shown;

[0013] Figure 4 yes Figure 1 A schematic cross-sectional view of the first cock shown;

[0014] Figure 5 yes Figure 4 A top view of the first cock shown;

[0015] Figure 6 yes Figure 1 A schematic cross-sectional view of the second cock shown;

[0016] Figure 7 yes Figure 6 A top view of the second stopcock shown;

[0017] Figure 8 yes Figure 1 A schematic cross-sectional view of the third cock shown;

[0018] Fig. 9 yes Figure 8 A top view of the third stopcock is shown;

[0019] Fig.10 yes Figure 1 The enlarged partial view shown;

[0020] Fig.11 yes Figure 1 The enlarged partial view shown;

[0021] Fig.12 yes Fig.10 The partial enlarged view shown in the figure, the arrows in the figure indicate the air flow direction;

[0022] Fig.13 yes Fig.12 The partial enlarged view shown in the figure, the arrows in the figure indicate the air flow direction;

[0023] Fig.14 yes Figure 8 A partial enlarged schematic diagram of the third cock shown;

[0024] Fig.15 yes Figure 6 A partial enlarged schematic diagram of the second stopcock is shown.

[0025] 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.

[0026] Description of reference numerals:

[0027] 11. Reactor container; 111. Container opening; 12. Reactor core assembly; 13. Tie rod; 14. Moving guide tube; 15. In-core shielding;

[0028] 101. Annular negative pressure air duct;

[0029] 20. First cock; 21. First dynamic sealing structure; 22. First body section; 221. Upper shell; 2211. Upper top plate; 2212. Upper bottom plate; 2213. Upper radial outer plate; 2214. First through hole upper enclosure; 222. Lower shell; 2221. Support plate; 2222. Steel column; 223. Screw; 23. First gamma shielding section; 24. First connecting section; 241. Reinforcement rib; 25. Manhole plug; 251. Plug body shielding section; 253. Plug body gamma shielding layer; 254. Connecting rod; 26. Manhole channel; 27. First through hole;

[0030] 201, first air duct; 2011, first air inlet;

[0031] 202, first bearing; 203, first gear ring; 204, first driving mechanism;

[0032] 30. Second cock; 31. Second dynamic sealing structure; 32. Second body section; 321. Second shell; 3211. Second top plate; 3212. Second bottom plate; 3213. Second radial outer plate; 3214. Second through hole enclosure plate; 33. Second gamma shielding section; 34. Second connecting section; 35. Control rod drive mechanism mounting socket; 350. Predetermined circumference; 351. First mounting plate; 360. Second mounting plate; 36. Control rod protection member; 361. Cylinder; 362. Bottom end cap; 37. Thermocouple mounting socket; 38. Lifting mechanism socket; 39. Second through hole;

[0033] 301, second air duct; 3011, second air inlet;

[0034] 302, second bearing; 303, second gear ring; 304, second driving mechanism;

[0035] 40. third cock; 41. third dynamic sealing structure; 42. third body section; 421. third shell; 4211. third top plate; 4212. third bottom plate; 4213. third radial outer plate; 4214. third through hole enclosure plate; 4215. fourth through hole enclosure plate; 43. third gamma shielding section; 44. third connecting section; 45. third through hole; 46. fourth through hole; 47. refueling machine pipe seat;

[0036] 401, third air duct; 4011, third air inlet;

[0037] 402, a third bearing; 403, a third gear ring; 404, a third driving mechanism;

[0038] 51. Thermal shielding layer; 52. Neutron shielding layer;

[0039] 61. first sealing plate; 62. first support tube; 621. first support tube vent; 63. first air-cooling enclosure; 631. first air-cooling vent; 64. first annular plate; 65. first vent plate; 66. first sealing connection portion;

[0040] 71. second sealing plate; 72. second support tube; 721. second support tube vent; 73. second air-cooling enclosure; 731. second air-cooling vent; 74. second annular plate; 76. second sealing connection portion;

[0041] 81. third sealing plate; 82. third supporting cylinder; 83. third air-cooling enclosure; 831. third air-cooling ventilation hole; 84. third annular plate;

[0042] 91. First connecting air duct; 92. Second connecting air duct; 93. Third connecting air duct; 94. Sealing body; 95. Matching piece; 96. Heating assembly; 97. Receiving groove; 971. First groove; 972. Second groove; 98. Liquid metal. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation 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 from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0044] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0045] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the common meanings understood by persons with ordinary skills in the field to which this application belongs.

[0046] In the description of the embodiments of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the related art, the plug assembly includes: a large plug and a small plug, the small plug is rotatably arranged on the large plug, the material changer is arranged on the small plug, and the material changer has a certain material change range through the rotation of the large plug and the small plug. The inventor of the present application found that the plug assembly with the above structure usually has a large size of the large plug, resulting in a large size of the plug assembly as a whole, which is not conducive to improving the economic efficiency of the reactor.

[0048] Therefore, in order to solve the above technical problems, an embodiment of the present application provides a plug assembly for a reactor. Figures 1 to 3 , Figure 1 is a cross-sectional schematic diagram of a plug assembly according to an embodiment of the present application, Figure 2 This is a schematic diagram of the distribution of the three cocks. Figure 3 1 is a top view of a plug assembly with a control rod drive mechanism mounting socket omitted. The reactor may include a reactor vessel 11, a core assembly 12 disposed in the reactor vessel 11, the reactor vessel 11 may include a container opening 111 coaxial with the core assembly 12, the reactor may further include a refueling machine, and the plug assembly may include a first plug 20, a second plug 30, and a third plug 40. The first plug 20 is rotatably disposed at the container opening 111 of the reactor vessel 11, the first plug 20 is provided with an eccentric first through hole 27, and the size of the first through hole 27 is greater than the radius of the first plug 20. The second plug 30 is disposed at the first through hole 27 of the first plug 20 and can rotate relative to the first plug 20, and the second plug 30 is provided with an eccentric second through hole 39. The third plug 40 is disposed at the second through hole 39 of the second plug 30 and can rotate relative to the second plug 30, and the third plug 40 is provided with an eccentric third through hole 45. The refueling machine is disposed at the third through hole 45 of the third plug 40.

[0049] The plug assembly provided in the embodiment of the present application is provided with three plugs, and the size of the first through hole 27 is made larger than the radius of the first plug 20. Through the rotational cooperation of the three plugs, it is beneficial to increase the moving range of the material changer, while reducing the size of the first plug 20, thereby optimizing the layout space of the plug assembly and improving the economy and material change efficiency of the reactor.

[0050] See also Figure 2 In some embodiments, the sum of the distances between the center of the second through hole 39 and the center of the second plug 30 is equal to one-half of the radius of the core assembly 12. It is easy to understand that the refueling machine rotates with the third through hole 45 of the third plug 40 relative to the second plug 30, the second plug 30 rotates relative to the first plug 20, and the first plug 20 rotates relative to the container opening 111 of the container 11, so that the moving trajectory of the refueling machine is affected by the position of the eccentric through hole of each plug. With such a configuration, the refueling machine can move within a circular range with the center of the core assembly 12 as the center and the radius of the core assembly 12 as the radius, ensuring that the moving trajectory of the refueling machine can completely cover the core assembly 12 under the premise of minimizing the plug size, thereby improving the space utilization rate and refueling efficiency of the plug assembly.

[0051] In some embodiments, the third cock 40 may also be provided with an eccentric fourth through hole 46 for placing a spare material changer or flow meter, thereby improving the maintenance efficiency and flexibility of the reactor.

[0052] In some embodiments, the fourth through hole 46 and the third through hole 45 are symmetrically distributed relative to the center of the third plug 40, and the center of the fourth through hole 46, the center of the third through hole 45 and the center of the third plug 40 are collinear, making the layout of the third plug 40 compact.

[0053] In some embodiments, the reactor may further include a plurality of control rods and a plurality of control rod drive mechanisms, wherein the control rod drive mechanisms are connected to the control rods. Figure 2 and Figure 7 , Figure 7The top view of the second plug is shown. The second plug 30 may include a plurality of control rod drive mechanism mounting sockets 35 for mounting a plurality of control rod drive mechanisms. The plurality of control rod drive mechanism mounting sockets 35 are arranged within a predetermined circumference 350. By rotating the second plug 30 relative to the first plug 20, the predetermined circumference 350 can be located concentrically with the first plug 20. Since the second plug 30 can rotate relative to the first plug 20, the first plug 20 can rotate relative to the container opening 111, and the predetermined circumference 350 where the control rod drive mechanism mounting sockets 35 are located can be adjusted accordingly. When the second plug 30 is in the working position and does not rotate, the predetermined circumference 350 is concentric with the first plug 20. At this time, each control rod drive mechanism mounting socket 35 can be located directly above the core assembly 12. When refueling is required, after all the control rods have been dropped, the control rod drive mechanism mounting tube seat 35 can be moved out from above the core assembly 12 by rotating the second cock 30, thereby providing space for the refueling machine. This ensures accurate positioning and effective control of the control rods and the control rod drive mechanism during normal operation of the reactor, and enables flexible avoidance during the refueling process, thereby improving the overall operating efficiency and safety of the reactor.

[0054] In some embodiments, see Figure 2 The center of the second through hole 39 is colinear with the center of the first through hole 27 and the center of the first plug 20, which can ensure a compact layout and reduce space waste and additional material requirements caused by eccentric arrangement, thereby helping to reduce the size of the first plug 20 while ensuring the plug function and improving space utilization.

[0055] In some embodiments, see Figure 1 , the plug assembly may also include a first dynamic sealing structure 21, a second dynamic sealing structure 31 and a third dynamic sealing structure 41. The first dynamic sealing structure 21 is used to seal the first plug 20 and the container opening 111 of the stack container 11. The second dynamic sealing structure 31 is used to seal the second plug 30 and the first through hole 27 of the first plug 20. The third dynamic sealing structure 41 is used to seal the third plug 40 and the second through hole 39 of the second plug 30. The difference between the diameter of the first plug 20 and the diameter of the core assembly 12 is equal to the sum of the ring width of the first dynamic sealing structure 21, the ring width of the second dynamic sealing structure 31, and the ring width of the third dynamic sealing structure 41, so that the moving trajectory of the material changer can completely cover the core assembly 12, and at the same time, it can also ensure the sealing of the opening of the stack container 11, and effectively prevent the leakage of radioactive substances.

[0056] In some embodiments, Fig.13: is a partial enlarged view of the plug assembly. The first dynamic sealing structure 21 may include a sealing body 94, a fitting 95 and a heating assembly 96. The sealing body 94 is connected to the periphery of the container opening 111 on the radial outer side of the stack container 11. The sealing body 94 is configured to form a receiving groove 97, in which liquid metal 98 (e.g., lead-bismuth alloy) is contained. The fitting 95 is connected to the first plug 20. The fitting 95 separates the receiving groove 97 into a first groove 971 located on the radial inner side and a second groove 972 located on the radial outer side. The bottoms of the first groove 971 and the second groove 972 are connected. The heating assembly 96 is disposed on the radial outer side of the receiving groove 97 to heat the liquid metal 98 in the receiving groove 97. When the first plug 20 does not rotate, the solidified liquid metal is used to statically seal the first plug 20 and the stack container 11; when the first plug 20 needs to rotate, the heating component 96 heats the liquid metal 98 in the receiving groove 97 to melt it in a liquid state, and the liquid metal is used to dynamically seal the plug and the stack container.

[0057] In some embodiments, the second dynamic sealing structure 31 and the third dynamic sealing structure 41 may have the same structure as the first dynamic sealing structure 21 .

[0058] See also Figure 2 In some embodiments, the distance between the center of the third through hole 45 of the third plug 40 and the center of the first plug 20 is equal to twice the distance between the center of the second plug 30 and the center of the first plug 20. In this way, when the material changer in the third through hole 45 rotates 180 degrees with the second plug 30, the material changer can cover the position of the exact center of the core assembly 12, thereby realizing effective material change within the entire range of the core assembly 12.

[0059] See also Figure 4 , Figure 4 2 is a cross-sectional schematic diagram of the first plug 20. In some embodiments, the first plug 20 may include a first body section 22, a first gamma shielding section 23 and a first connecting section 24. The first gamma shielding section 23 is connected to the first body section 22 through the first connecting section 24. The first body section 22 faces the container opening 111 of the reactor vessel 11, and the first connecting section 24 and the first gamma shielding section 23 enter the interior of the reactor vessel 11. It is easy to understand that part of the structure of the first plug 20 is located inside the reactor vessel 11 and is affected by the high temperature inside the reactor, while part of the structure outside the reactor is at room temperature, resulting in a significant temperature difference in the first plug 20, which is easy to cause deformation. In this embodiment, the first plug 20 is divided into a multi-section structure, which can effectively reduce the deformation of the first plug 20 caused by the temperature difference.

[0060] The first gamma shield segment 23 of the first cock 20 can enter the radially inner side of the top of the in-stack shield 15 .

[0061] In some embodiments, the first body section 22 may include a heat shielding layer 51 and a neutron shielding layer 52 for reducing heat transfer and shielding neutrons in the reactor, respectively.

[0062] In some embodiments, the heat shielding layer 51 may be a calcium silicate layer. In some embodiments, the neutron shielding layer 52 may be a graphite layer.

[0063] In some embodiments, the first body section 22 may include an upper section and a lower section, and the lower section is connected to the upper section by a plurality of screws 223. The upper section of the first body section 22 may include an upper shell 221 and a multi-layer neutron shielding layer 52 disposed in the upper shell 221. The upper shell 221 forms a sealing structure, and the upper shell 221 may include an upper top plate 2211, an upper bottom plate 2212, an upper radial outer plate 2213, and a first through-hole upper enclosure plate 2214, and these plates together enclose a sealed space, and the multi-layer neutron shielding layer 52 is disposed in the sealed space.

[0064] The lower section of the first body section 22 may include a lower shell 222, a multi-layer neutron shielding layer 52 and a multi-layer heat shielding layer 51 arranged in the lower shell 222, and the lower shell 222 may include a lower top plate, a lower bottom plate, a lower radial outer plate and a first through-hole lower enclosure plate, and these plates together enclose a sealed space, and the neutron shielding layer 52 and the heat shielding layer 51 are alternately arranged, and the bottom is the heat shielding layer 51. In this embodiment, the first body section 22 is divided into an upper section and a lower section, and the upper section is mainly used to ensure structural stability and shield neutrons. Because the temperature of the lower section is close to the reactor and is higher, the neutron shielding layer 52 and the heat shielding layer 51 are alternately arranged, and the bottom is the heat shielding layer 51, which can effectively prevent thermal deformation and shield neutrons; enhance the stability of the overall structure and each shielding material.

[0065] In addition, the upper shell 221 and the lower shell 222 are configured as a sealed structure, which can also prevent leakage of radioactive substances.

[0066] In some embodiments, the lower section may further include a plurality of support plates 2221 (e.g., thin steel plates) for supporting the neutron shielding layer 52 and the heat shielding layer 51. In order to enhance the supporting effect, the lower section may further include a plurality of steel columns 2222, which are disposed between two adjacent layers of support plates 2221. The bottom of the steel column 2222 may be fixed to the lower support plate 2221 by threaded connection, and the top of the steel column 2222 abuts against the upper support plate 2221 to support the upper support plate 2221, which is convenient for installation and also helps to avoid structural deformation caused by thermal expansion.

[0067] In some embodiments, the first connecting section 24 can be a steel cylinder structure, and the first gamma shielding section 23 is connected to the bottom end of the steel cylinder. The steel cylinder can effectively reduce the temperature of the first gamma shielding section 23, reduce the deformation of the first plug 20 caused by temperature difference, and also play a heat shielding role.

[0068] In some embodiments, the first gamma shielding section 23 may be a steel plate structure with multiple layers arranged at intervals, which can enhance the shielding effect against gamma rays and improve the safety of reactor operation.

[0069] In some embodiments, a plurality of obliquely extending reinforcing ribs 241 may be provided on the inner wall of the steel cylinder. The reinforcing ribs 241 can enhance the structural strength of the steel cylinder, thereby preventing the steel cylinder from being deformed due to high temperature.

[0070] See also Figure 4 and Figure 5 , Figure 5 2 is a top view of the first cock 20. In some embodiments, the first cock 20 may also form a manhole passage 26 for operators to pass through and a manhole plug 25 for closing the manhole passage 26. The manhole passage 26 extends downward through the first body section 22 and the first gamma shielding section 23. The manhole passage 26 is located radially inside the first connecting section 24.

[0071] The manhole plug 25 may include a plug body shielding section 251, a connecting rod 254, and a plug body gamma shielding layer 253 connected to the plug body shielding section 251 through the connecting rod 254. The plug body shielding section 251, the connecting rod 254, and the plug body gamma shielding layer 253 face the first body section 22, the first connecting section 24, and the first gamma shielding section 23, respectively. In this embodiment, by forming a manhole channel 26 on the first cock 20, it is convenient for operators to enter the reactor vessel 11 for maintenance and overhaul. After the operator completes the maintenance or overhaul work, the manhole plug 25 can be used to close the manhole channel 26 to ensure the overall sealing of the first cock 20. At the same time, the manhole plug 25 is also provided with multi-layer shielding to ensure the safety of reactor operation.

[0072] In some embodiments, the plug body gamma shielding layer 253 may be a cylindrical steel block for shielding gamma rays and cooling high temperature gas escaping from the reactor. The structure of the plug body shielding segment 251 may be the same as that of the first body segment 22 .

[0073] See also Figure 6 and Figure 7 as well as Fig.15 , Figure 6 is a cross-sectional schematic diagram of the second cock 30, Figure 7 yes Figure 6 A top view of the second tap 30 is shown; Fig.15 yes Figure 6FIG. 1 is a partial enlarged schematic diagram of the second plug 30. In some embodiments, the second plug 30 may further include a second body section 32, a second gamma shielding section 33, and a second connecting section 34. The second gamma shielding section 33 is connected to the second body section 32 via the second connecting section 34. In this embodiment, the second plug 30 is divided into multiple sections, which can effectively reduce the deformation of the second plug 30 caused by the temperature difference.

[0074] In some embodiments, a plurality of control rod drive mechanism mounting sockets 35 may be disposed on the second body section 32. The second cock 30 may further include a control rod protection member 36. The control rod protection member 36 is connected to the second connecting section 34 at the lower end thereof. The control rods extend downward from the radial inner side of the control rod protection member 36. The control rod protection member 36 can effectively prevent the control rods from being impacted by the in-core coolant, thereby ensuring the stability of the control rods during operation of the reactor.

[0075] In some embodiments, the control rod protection member 36 may include a cylinder 361 and a bottom head 362. The bottom head 362 is provided with a through hole for each control rod to pass through, so that the control rod can be protected in the cylinder 361 to avoid being impacted by liquid metal, and when the reactor is running, the control rod can also be dropped through the through hole of the bottom head 362 to ensure the safety of the reactor.

[0076] In some embodiments, there is a minimum distance between the third through hole 45 and the control rod guard 36. During the rotation process, the refueling machine always maintains a certain distance from the control rod guard 36, so as to avoid the interference of the control rod guard 36 affecting the operation of the refueling machine. The minimum distance can be determined according to the size of the refueling machine and the outer dimensions of the middle cock control rod guard 36 to ensure that the two do not interfere with each other and do not affect the operation of the refueling machine. If this minimum distance increases, the overall size of the cock assembly will also increase, which is not conducive to economic efficiency and cock arrangement. In some embodiments, the minimum distance can be greater than 127 mm, for example.

[0077] In some embodiments, the reactor may further include a plurality of thermocouples, and the second stopcock 30 may further include a plurality of thermocouple mounting sockets 37 for mounting the plurality of thermocouples. The plurality of thermocouple mounting sockets 37 may be disposed on the second body section 32. In this embodiment, by installing a plurality of thermocouple mounting sockets 37 on the body section of the second stopcock 30, the thermocouples may be stably mounted, which facilitates monitoring of the temperature in the reactor, thereby improving the safety of the reactor operation.

[0078] In some embodiments, the reactor may further include multiple moving guide tube lifting mechanisms, the second cock 30 may include multiple lifting mechanism sockets 38, the reactor may include multiple tie rods 13 and multiple moving guide tubes 14, and the lifting mechanism sockets 38 are used to install multiple moving guide tube lifting mechanisms. Multiple lifting mechanism sockets 38 may be arranged on the second body section 32. The moving guide tube lifting mechanism is used to drive the tie rods 13 and the moving guide tube 14 to perform lifting and lowering movements, thereby driving the control rods to lift and lower.

[0079] In some embodiments, see Figure 6 The second body section 32 may include a heat shielding layer 51 and a neutron shielding layer 52, which are used to reduce heat transfer and shield neutrons in the reactor, respectively.

[0080] In some embodiments, the second body section 32 may include a second shell 321, a multi-layer neutron shielding layer 52 and a multi-layer heat shielding layer 51 disposed in the second shell 321. The second shell 321 may include a second top plate 3211, a second bottom plate 3212, a second radially outer plate 3213 and a second through-hole enclosure plate 3214, which together form a sealed space, and the neutron shielding layer 52 and the heat shielding layer 51 are disposed in the sealed space.

[0081] The upper part of the sealed space may be provided with multiple neutron shielding layers 52, and the lower part of the sealed space may be provided with neutron shielding layers 52 and heat shielding layers 51 alternately, with the heat shielding layer 51 being the lowest. In this embodiment, the second body section 32 is provided with multiple shielding layers to reduce heat transfer and shield neutrons in the pile.

[0082] In some embodiments, the second connecting section 34 may be a steel cylinder structure, and the second gamma shielding section 33 is connected to the bottom end of the steel cylinder. The steel cylinder can effectively reduce the temperature of the second gamma shielding section 33 and play a role in heat shielding.

[0083] In some embodiments, the second body section 32 may include a first mounting plate 351, and the second connecting section 34 is connected to the first mounting plate 351. The first mounting plate 351 is provided with a plurality of holes for suspending the guide tube of the control rod drive mechanism, the guide tube of the thermocouple, and the guide tube of the control rod drive mechanism.

[0084] In some embodiments, the second gamma shielding section 33 may include a multi-layer steel plate structure, which can enhance the shielding effect against gamma rays and improve the safety of reactor operation.

[0085] In some embodiments, the second cock 30 may include a second mounting plate 360 ​​, and the control rod guard 36 is connected to the second mounting plate 360 ​​.

[0086] See also Figure 8 and Fig. 9 as well as Fig.14 , Figure 8is a cross-sectional schematic diagram of the third cock 40, Fig. 9 is a top view of the third cock 40, Fig.14 yes Figure 8 A partial enlarged view of the third plug 40 is shown. In some embodiments, the third plug 40 may include a third body segment 42, a third gamma shielding segment 43 and a third connecting segment 44, and the third gamma shielding segment 43 is connected to the third body segment 42 through the third connecting segment 44. In this embodiment, the third plug 40 is divided into multiple segments, which can effectively reduce the deformation of the third plug 40 caused by temperature difference.

[0087] In some embodiments, the third body segment 42 may include a heat shielding layer 51 and a neutron shielding layer 52 for reducing heat transfer and shielding neutrons in the reactor, respectively.

[0088] In some embodiments, the third body section 42 may include a third shell 421, a multi-layer neutron shielding layer 52 and a multi-layer heat shielding layer 51 disposed in the third shell 421. The third shell 421 may include a third top plate 4211, a third bottom plate 4212, a third radially outer plate 4213, a third through-hole surrounding plate 4214 and a fourth through-hole surrounding plate 4215, and these plates together enclose a sealed space, and the neutron shielding layer 52 and the heat shielding layer 51 are disposed in the sealed space.

[0089] The upper part of the sealed space of the third body segment 42 may be provided with multiple neutron shielding layers 52, and the lower part may be provided with neutron shielding layers 52 and heat shielding layers 51 alternately, with the heat shielding layer 51 at the bottom, so as to effectively insulate and shield neutrons.

[0090] In some embodiments, the third cock 40 further includes a material changer pipe seat 47 disposed on the third body section 42 for installing the material changer.

[0091] In some embodiments, the third connecting section 44 may be a steel cylinder structure, and the third gamma shielding section 43 is connected to the bottom end of the steel cylinder. The steel cylinder can effectively reduce the temperature of the third gamma shielding section 43 and play a role in heat shielding.

[0092] In some embodiments, the third gamma shielding segment 43 may be a multi-layer steel plate structure, which can enhance the shielding effect against gamma rays and improve the safety of reactor operation.

[0093] In some embodiments, the upper top plate 2211 of the first plug 20, the second top plate 3211 of the second plug 30, and the third top plate 4211 of the third plug 40 can all be low-alloy steel plates with a certain thickness and rigidity to support each plug.

[0094] See also Figure 3 , Figures 10 to 13 , Figures 10 to 13 A partial enlarged cross-sectional view of the plug assembly is shown, Fig.12 and Fig.13 The arrows in the figure indicate the air flow direction. In some embodiments, the reactor may further include an annular negative pressure air duct 101 located radially outside the container opening 111. The first cock 20, the second cock 30 and the third cock 40 are respectively provided with a first air duct 201, a second air duct 301 and a third air duct 401. The first air duct 201, the second air duct 301 and the third air duct 401 are respectively provided with a first air inlet 2011, a second air inlet 3011 and a third air inlet 4011 for air to enter. The air entering the third air duct 401 can enter the second air duct 301. The air entering the second air duct 301 can enter the first air duct 201. The air entering the first air duct 201 can enter the annular negative pressure air duct 101. In this embodiment, the air ducts of the three cocks are connected and cooperated with the annular negative pressure air duct 101, so as to realize the cooling and ventilation of the cock assembly, reduce the influence of the high temperature in the stack on the cock assembly, and thus ensure the stability of the operation of the cock assembly.

[0095] See also Fig.12 In some embodiments, a first connecting air duct 91 is formed between the first air duct 201 and the annular negative pressure air duct 101, a second connecting air duct 92 is formed between the second air duct 301 and the first air duct 201, and a third connecting air duct 93 is formed between the third air duct 401 and the second air duct 301. The first dynamic sealing structure 21 is arranged in the first connecting air duct 91, the second dynamic sealing structure 31 is arranged in the second connecting air duct 92, and the third dynamic sealing structure 41 is arranged in the third connecting air duct. In this way, the cooling and ventilation of the plug assembly can be ensured while the sealing between the plugs is achieved.

[0096] See also Figures 11 to 13 The first plug 20 also includes a first sealing plate 61 arranged above the upper top plate 2211, a first support tube 62 connecting the first sealing plate 61 and the upper top plate 2211, a first air-cooling surrounding tube 63 arranged radially outside the first support tube 62, and a first annular plate 64 connecting the first air-cooling surrounding tube 63 and the first support tube 62.

[0097] The second plug 30 also includes a second sealing plate 71 arranged above the second top plate 3211, a second support tube 72 connecting the second sealing plate 71 and the second top plate 3211, a second air-cooling surrounding tube 73 arranged radially outside the second support tube 72, and a second annular plate 74 connecting the second air-cooling surrounding tube 73 and the second support tube 72.

[0098] The third plug 40 also includes a third sealing plate 81 arranged above the third top plate 4211, a third support cylinder 82 connecting the third sealing plate 81 and the third top plate 4211, a third air-cooling surrounding cylinder 83 arranged radially outside the third support cylinder 82, and a third annular plate 84 connecting the third air-cooling surrounding cylinder 83 and the third support cylinder 82.

[0099] A first air duct 201 is formed between the first sealing plate 61 , the upper top plate 2211 , the first support tube 62 and the second air-cooling surrounding tube 73 , and a first air inlet 2011 is arranged on the upper top plate 2211 , thereby cooling the top of the first valve 20 , which is beneficial to the stable operation of the first valve 20 .

[0100] A second air duct 301 is formed between the second sealing plate 71 , the second top plate 3211 , the second support tube 72 and the third air-cooling surrounding tube 83 , and a second air inlet 3011 is arranged on the second top plate 3211 , thereby cooling the top of the second plug 30 , which is beneficial to the stable operation of the second plug 30 .

[0101] The third sealing plate 81 , the third top plate 4211 , and the third support tube 82 form a third air duct 401 . The third air inlet 4011 is arranged on the third top plate 4211 , thereby cooling the top of the third valve 40 , which is beneficial to the stable operation of the third valve 40 .

[0102] Such an arrangement enables an air duct to be formed at the top of each cock, thereby cooling the cock assembly and ensuring the stability of the operation of the cock assembly.

[0103] The container opening 111 of the stack container 11 is welded to the sealing body 94 of the first dynamic sealing structure 21 ; and the first annular plate 64 is welded to the fitting 95 .

[0104] The first cock 20 further includes a first sealing connection portion 66 connected to the first body section 22. The first sealing connection portion 66 is disposed radially outside the second air-cooling enclosure 73. The second annular plate 74 is welded to the sealing body 94 of the second dynamic sealing structure 31; the first sealing connection portion 66 is welded to the matching piece 95 of the second dynamic sealing structure 31.

[0105] The second cock 30 further includes a second sealing connection portion 76 connected to the second body section 32. The second sealing connection portion 76 is disposed radially outside the third air-cooling enclosure 83. The third annular plate 84 is welded to the sealing body 94 of the third dynamic sealing structure 41; the second sealing connection portion 76 is welded to the matching piece 95 of the third dynamic sealing structure 41.

[0106] See also Fig.12 and Fig.13In some embodiments, the first air-cooling enclosure 63, the first annular plate 64, the first support tube 62 and the stack container 11 form a first connecting air duct 91. The first air-cooling enclosure 63 forms a first air-cooling ventilation hole 631, and the first connecting air duct 91 is connected to the annular negative pressure air duct 101 through the first air-cooling ventilation hole 631. In this embodiment, by forming the first connecting air duct 91 and connecting with the annular negative pressure air duct 101, air can flow in from the first air inlet 2011, flow through the upper top plate of the first cock 20, and then flow out from the annular negative pressure air duct 101, thereby realizing ventilation and cooling of the top of the first cock 20, which is beneficial to the stable operation of the first cock 20.

[0107] See also Fig.12 In some embodiments, the second air-cooling enclosure 73, the second annular plate 74, the second support cylinder 72, and the upper top plate 2211 of the first cock 20 form a second connecting air duct 92. The second air-cooling enclosure 73 forms a second air-cooling vent 731, and the second connecting air duct 92 is connected to the first air duct 201 through the second air-cooling vent 731, thereby achieving air circulation between the top of the first cock 20 and the top of the second cock 30.

[0108] See also Fig.11 In some embodiments, the third air-cooling enclosure 83, the third annular plate 84, the third support tube 82 and the second top plate 3211 form a third connecting air duct 93. The third air-cooling enclosure 83 forms a third air-cooling ventilation hole 831, and the third connecting air duct 93 is connected to the second air duct 301 through the third air-cooling ventilation hole 831, thereby achieving air circulation between the top of the second cock 30 and the top of the third cock 40.

[0109] See also Fig.12 In some embodiments, the first cock 20 may further include a first ventilation plate 65 disposed between the upper top plate 2211 and the first sealing plate 61. The first ventilation plate 65 forms a through hole, and the area of ​​the first support cylinder 62 located below the first ventilation plate 65 forms first support cylinder ventilation holes 621 distributed along the circumferential direction. The air in the first air duct 201 flows into the lower part of the first ventilation plate 65 through the through hole of the first ventilation plate 65, and enters the first connecting air duct 91 through the first support cylinder ventilation holes 621.

[0110] Correspondingly, the second cock 30 may further include a second ventilation plate disposed between the second top plate 3211 and the second sealing plate 71. The second ventilation plate forms a through hole, and the area of ​​the second support cylinder 72 located below the second ventilation plate forms second support cylinder ventilation holes 721 distributed along the circumferential direction. The air in the second air duct 301 flows into the lower part of the second ventilation plate through the through hole of the second ventilation plate, and enters the second connecting air duct 92 through the second support cylinder ventilation holes 721. The air in the second connecting air duct 92 enters the first air duct 201 through the second air-cooling ventilation holes 731.

[0111] The third cock 40 may also include a third ventilation plate disposed between the third top plate 4211 and the third sealing plate 81. The third ventilation plate forms a through hole, and the third support cylinder 82 is located in the area below the third ventilation plate to form third support cylinder ventilation holes distributed in the circumferential direction. The air in the third air duct 401 flows into the bottom of the third ventilation plate through the through hole of the third ventilation plate, and enters the third connecting air duct 93 through the third support cylinder ventilation hole. The air in the third connecting air duct 93 enters the second air duct 301 through the third air-cooling ventilation hole 831. In this embodiment, by arranging the ventilation plate, the air in the first air duct 201, the second air duct 301, and the third air duct 401 flows through the ventilation plate respectively, and enters the connecting air duct through the support cylinder ventilation hole of each cock, thereby achieving uniform cooling of the top of each cock and improving the stability of the cock assembly.

[0112] The first cock 20 is rotatably connected to the container opening 111 via a first bearing 202. The reactor may further include a first driving mechanism 204 for driving the first cock 20 to rotate relative to the stack container 11. The first driving mechanism 204 may be disposed on the stack container 11.

[0113] The second cock 30 is rotatably connected to the first through hole 27 via a second bearing 302. The reactor may further include a second driving mechanism 304 for driving the second cock 30 to rotate relative to the first cock 20. The second driving mechanism 304 may be provided at the first cock 20.

[0114] The third cock 40 is rotatably connected to the second through hole 39 via a third bearing 402. The reactor may further include a third driving mechanism 404 for driving the third cock 40 to rotate relative to the second cock 30. The third driving mechanism 404 may be provided on the second cock 30.

[0115] In some embodiments, the first tap 20 may further include a first gear ring 203 disposed on the first support tube 62 , and the first driving mechanism 204 is engaged with the first gear ring 203 via a transmission gear to drive the first tap 20 to rotate relative to the stack container 11 .

[0116] In some embodiments, the second stopper 30 may further include a second gear ring 303 disposed on the second support cylinder 72 , and the second driving mechanism 304 is engaged with the second gear ring 303 via a transmission gear to drive the second stopper 30 to rotate relative to the first stopper 20 .

[0117] In some embodiments, the third stopper 40 may further include a third gear ring 403 disposed on the third support cylinder 82 , and the third driving mechanism 404 is engaged with the third gear ring 403 via a transmission gear to drive the third stopper 40 to rotate relative to the second stopper 30 .

[0118] The plug assembly provided in the embodiment of the present application is beneficial to increase the moving range of the material changer by setting three plugs and making the size of the first through hole 27 larger than the radius of the first plug 20, thereby optimizing the layout space of the plug assembly, and further improving the economy and material change efficiency of the reactor; by setting a multi-layer shielding layer and a dynamic sealing structure, the safety of the reactor operation is ensured; by forming multiple air ducts on the top of the plug assembly, the cooling of the plug assembly is achieved, thereby ensuring the stability of the operation of the plug assembly.

[0119] 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.

[0120] The above description is only a specific implementation manner 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 plug assembly for a reactor, the reactor comprising a reactor vessel, a core assembly disposed in the reactor vessel, the reactor vessel comprising a vessel opening coaxial with the core assembly, the reactor further comprising a refueling machine, characterized in that: The plug assembly comprises: A first cock, the first cock is rotatably disposed at a container opening of a stack container of the reactor, the first cock is provided with an eccentric first through hole, and a size of the first through hole is larger than a radius of the first cock; A second cock, the second cock is arranged in the first through hole of the first cock and can rotate relative to the first cock, and the second cock is provided with an eccentric second through hole; a third cock, the third cock being arranged in the second through hole of the second cock and being rotatable relative to the second cock, the third cock being provided with an eccentric third through hole; The material changer is arranged at the third through hole of the third cock.

2. The plug assembly according to claim 1, characterized in that: The sum of distances between the center of the second through hole and the center of the second cock is equal to half of the radius of the core assembly.

3. The plug assembly according to claim 1, characterized in that: The reactor further includes a plurality of control rods and a plurality of control rod drive mechanisms, wherein the control rod drive mechanisms are connected to the control rods; The second cock includes a plurality of control rod drive mechanism mounting sockets for mounting the plurality of control rod drive mechanisms; The plurality of CRDM mounting sockets are arranged within a predetermined circumference, and the predetermined circumference can be located concentrically with the first plug by rotating the second plug relative to the first plug.

4. The plug assembly according to claim 1, characterized in that: The center of the second through hole is in a collinear relationship with the center of the first through hole and the center of the first cock.

5. The plug assembly according to claim 1, characterized in that: Also includes: a first dynamic sealing structure, for sealing the first cock and the container opening of the stack container; A second dynamic sealing structure, used for sealing the second stopper and the first through hole of the first stopper; A third dynamic sealing structure, used for sealing the third plug and the second through hole of the second plug; The difference between the diameter of the first cock and the diameter of the core assembly is equal to the sum of the ring width of the first dynamic sealing structure, the ring width of the second dynamic sealing structure, and the ring width of the third dynamic sealing structure.

6. The plug assembly according to claim 1, characterized in that: A distance between a center of the third through hole of the third plug and a center of the first plug is equal to twice a distance between a center of the second plug and a center of the first plug.

7. The plug assembly according to claim 1, characterized in that: The first cock comprises: a first body segment, a first gamma shielding segment and a first connecting segment, wherein the first gamma shielding segment is connected to the first body segment via the first connecting segment; The first body section faces a container opening of a stack container of the reactor, and the first connecting section and the first gamma shielding section enter into the stack container.

8. The plug assembly according to claim 3, characterized in that: The second cock further comprises: a second body segment, a second gamma shielding segment and a second connecting segment, wherein the second gamma shielding segment is connected to the second body segment via the second connecting segment; The plurality of control rod drive mechanism mounting sockets are arranged on the second body section; The second cock further includes a control rod protection member, wherein the plurality of control rods extend downward from the radial inner side of the control rod protection member.

9. The plug assembly according to claim 1, characterized in that: The third stopcock includes: a third body segment, a third gamma shielding segment and a third connecting segment, and the third gamma shielding segment is connected to the third body segment through the third connecting segment.

10. The plug assembly according to claim 1, characterized in that The reactor further includes an annular negative pressure air duct located radially outside the container opening; The first cock, the second cock and the third cock are respectively provided with a first air duct, a second air duct and a third air duct, The first air duct, the second air duct and the third air duct are respectively provided with a first air inlet, a second air inlet and a third air inlet for air to enter; The air entering the third air duct can enter the second air duct; The air entering the second air duct can enter the first air duct; The air entering the first air duct can enter the annular negative pressure air duct.

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