Integrated reactor top structure and system

Abstract

This application relates to an integrated reactor top structure and system. The integrated reactor top structure includes a pressure vessel top cover, a control rod drive mechanism, a lifting device assembly, a seismic support assembly, a cable assembly, and a flow-guiding baffle assembly. The lifting device assembly includes multiple lifting rods connected to the pressure vessel top cover. The seismic support assembly is located above the pressure vessel top cover and is fixedly connected to the multiple lifting rods. The control rod drive mechanism is installed between the pressure vessel top cover and the seismic support assembly. The cable assembly is supported above the seismic support assembly. The flow-guiding baffle assembly is located below the seismic support assembly and is fixed to the seismic support assembly or the multiple lifting rods, serving to separate the control rod drive mechanism and the cable assembly. This application uses the flow-guiding baffle assembly to prevent the upward flow of hot gas from the lower part of the integrated reactor top structure, thereby reducing the impact of hot gas on the cables, improving cable safety, and ultimately improving the safety and economy of reactor operation.

Description

Technical Field

[0001] This application relates to the field of pressurized water nuclear power plant technology, and in particular to an integrated reactor top structure and system. Background Technology

[0002] The reactor top structure is one of the important components of the reactor, located above the reactor pressure vessel (RPV). Its functions include: limiting excessive deformation of the control rod drive mechanism (CRDM) during earthquakes to maintain its normal function and ensure its integrity; providing support and laying channels for all cables on the reactor pressure vessel top cover and guiding them to the interface on the civil engineering platform; and hoisting the entire top structure to (or away from) the reactor pressure vessel through connection with the main ring crane in the nuclear power plant during reactor installation and refueling or maintenance operations.

[0003] Currently, reactor top structures can be divided into distributed and integrated types, and can also be either suitable for conventional drive mechanisms or for high-temperature drive mechanisms. However, regardless of the type of reactor top structure, the cables supported on the reactor top structure are inevitably subjected to heat radiation generated by the drive mechanism during operation and heat radiation from the high-temperature water in the primary loop. This shortens the service life of the cables, affects their safety, and consequently impacts the safety and economy of reactor operation. Summary of the Invention

[0004] Based on this, this application provides an integrated reactor top structure and system to improve the safety of cables, thereby improving the safety and economy of reactor operation.

[0005] An embodiment of the first aspect of this application provides an integrated stack top structure, including a pressure vessel top cover, a control rod drive mechanism, a lifting device assembly, a seismic support assembly, a cable assembly, and a flow guide baffle assembly. The lifting device assembly includes multiple lifting rods, all of which are connected to the pressure vessel top cover. The seismic support assembly is located above the pressure vessel top cover and is fixedly connected to the multiple lifting rods. The control rod drive mechanism is installed between the pressure vessel top cover and the seismic support assembly. The cable assembly is supported above the seismic support assembly. The flow guide baffle assembly is located below the seismic support assembly and is fixed to the seismic support assembly or the multiple lifting rods, and the flow guide baffle assembly serves to separate the control rod drive mechanism and the cable assembly.

[0006] In some embodiments, the number of control rod drive mechanisms is multiple; the flow guide baffle assembly includes a baffle fixed to the seismic support assembly or the multiple hangers, and the baffle has multiple openings through which the tops of the multiple control rod drive mechanisms pass.

[0007] In some embodiments, the flow guide baffle assembly further includes a bracket, which is fixed to the seismic support assembly or the plurality of hangers, and the baffle is connected to the bracket.

[0008] In some embodiments, the plurality of control rod drive mechanisms are arranged in an array along a first direction and a second direction, the first direction and the second direction intersecting each other; the partition includes a plurality of sub-partitions, the plurality of sub-partitions being spaced apart along the first direction, each sub-partition extending along the second direction; both ends of each sub-partition are hinged to the bracket; a row of control rod drive mechanisms is arranged between each pair of adjacent sub-partitions; a plurality of grooves are formed on the opposite edges of each pair of adjacent sub-partitions, and two grooves on the two opposite edges and distributed oppositely together surround the opening.

[0009] In some embodiments, each of the sub-partitions is mounted on the bracket by a mounting assembly including a hinge, a first link, and a second link; two hinges are fixed to the bracket and located at both ends of one of the sub-partitions; one end of the first link is rotatably connected to one of the hinges, and the other end of the first link is fixedly connected to one end of one of the sub-partitions; one end of the second link is rotatably connected to the other hinge, and the other end of the second link is fixedly connected to the other end of one of the sub-partitions.

[0010] In some embodiments, the flow guide baffle assembly further includes a drive member connected to all the sub-baffles, the drive member being used to drive all the sub-baffles to rotate synchronously.

[0011] In some embodiments, the drive member is located on the same side of all the sub-partitions and connected to all the sub-partitions; the drive member is used to drive all the sub-partitions to rotate synchronously in a first position and a second position; in the first position, all the sub-partitions are perpendicular to the central axis of the control rod drive mechanism; in the second position, all the sub-partitions are parallel to the central axis of the control rod drive mechanism.

[0012] In some embodiments, the flow guide baffle assembly further includes a locking assembly, which includes a mounting base, a locking member, and a driving mechanism. The mounting base is fixed to the bracket, the locking member is movably disposed on the mounting base, and the driving mechanism is disposed on the mounting base. The driving mechanism is connected to the locking member and is used to drive the locking member to move toward the driving member and cooperate with the driving member to lock the driving member.

[0013] In some embodiments, the integrated stack top structure further includes a seismic tie rod, one end of which is connected to the seismic support assembly, and the other end of which is used to connect to the pool wall.

[0014] In some embodiments, the cable assembly includes a cable tray, a cable bridge, a cable adapter plate, and a cable grid; the cable tray is supported above the seismic support assembly; one side of the cable bridge is supported above the seismic support assembly, and the other side of the cable bridge is used to support the top of the water tank; the cable adapter plate is fixed on the cable tray; the cable grid is distributed around the control rod drive mechanism and suspended below the seismic support assembly.

[0015] In some embodiments, the spreader assembly further includes a lifting assembly located above the cable assembly and connected to the plurality of booms.

[0016] In some embodiments, a connector is provided on the top of the control rod drive mechanism, the connector is located above the flow guide baffle assembly, the connector is used to connect a cable, and a thermal protection sleeve is provided on the outside of the connector.

[0017] In some embodiments, the length of the thermal protection sleeve is 50mm to 200mm.

[0018] In some embodiments, the partition is made of stainless steel and has a thickness of 3mm to 20mm.

[0019] An embodiment of the second aspect of this application provides an integrated stack top system, including the integrated stack top structure described in the first aspect.

[0020] In some embodiments, the integrated stack top system further includes a water tank, the integrated stack top structure is located within the water tank, and ventilation openings are formed in the tank wall; the ventilation openings are located between the coil assembly and the rod position detector assembly of the control rod drive mechanism; the number of ventilation openings is multiple, and the multiple ventilation openings are spaced apart along the circumferential direction of the pressure vessel top cover.

[0021] In some embodiments, the cross-section of the vent is circular or square, and the diameter or side length of the vent is between 100mm and 1000mm.

[0022] According to the integrated reactor top structure provided in this application, the cable assembly is supported above the seismic support assembly; the baffle assembly is located below the seismic support assembly and is fixed to the seismic support assembly or multiple booms. The baffle assembly separates the control rod drive mechanism from the cable assembly. Thus, when the reactor is running, the baffle assembly prevents the hot gas flow from continuing to rise from the lower part of the integrated reactor top structure, causing the hot gas flow to disperse along the baffle assembly to the periphery of the integrated reactor top structure. This prevents the hot gas flow from directly reaching the cable assembly, thereby reducing the impact of the hot gas flow on the cable, improving cable safety, enhancing the safety and economy of the reactor top structure, and ultimately improving the safety and economy of reactor operation.

[0023] In addition, the components of the reactor top structure of this application are interconnected. During normal use and during the opening and closing of the cover, the components of the reactor top structure exist as a whole, without the need to remove or disassemble any component, thereby realizing the integration of the reactor top structure, which is beneficial to the safety and economy of reactor operation.

[0024] Furthermore, the pressure vessel top cover of this application is connected to multiple booms of the lifting assembly, the seismic support assembly is located above the pressure vessel top cover and connected to multiple booms, and the control rod drive mechanism is installed between the pressure vessel top cover and the seismic support assembly. The large spacing between the multiple booms facilitates sufficient air convection. Without setting a reactor top ventilation structure, it can meet the air convection requirements of the high-temperature control rod drive mechanism during self-cooling, which helps to reduce the weight of the entire reactor top structure, simplify the reactor top structure, improve the convenience of reactor top maintenance during reactor shutdown and refueling, reduce refueling time and personnel radiation dose, improve the safety and economy of the reactor top structure, and further improve the safety and economy of reactor operation. Attached Figure Description

[0025] Figure 1 This is a front view of an integrated stack top structure in some embodiments of this application.

[0026] Figure 2 This is a top view of an integrated stack top structure in some embodiments of this application.

[0027] Figure 3 This is a schematic diagram of the structure of the flow guide baffle assembly in some embodiments of this application.

[0028] Figure 4 This is a partial structural schematic diagram of the flow guide baffle assembly in some embodiments of this application.

[0029] Figure 5 This is another partial structural schematic diagram of the flow guide baffle assembly in some embodiments of this application.

[0030] Figure 6 This is a schematic diagram of the locking component of the flow guide baffle assembly in some embodiments of this application.

[0031] Figure 7 This is a structural schematic diagram of the flow guide baffle assembly in some embodiments of this application from another perspective.

[0032] Figure 8 This is a partial structural schematic diagram of the flow guide baffle assembly in some embodiments of this application from another perspective.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10. Integrated reactor top structure;

[0035] 110. Pressure vessel top cover;

[0036] 120. Control rod drive mechanism; 121. Connecting component;

[0037] 130. Lifting gear assembly; 131. Lifting boom; 132. Lifting assembly;

[0038] 140. Seismic bearing components;

[0039] 150. Cable assembly; 151. Cable tray; 152. Cable bridge; 153. Cable junction box; 154. Cable grid;

[0040] 160. Baffle assembly; 161. Baffle; 1610. Opening; 1611. Sub-baffle; 1611a. Edge; 1612. Groove; 162. Bracket; 163. Clamping ring assembly; 1631. Connecting frame; 1632. Clamping clamp; 164. Hinge support; 165. First connecting rod; 166. Second connecting rod; 1661. First section; 1662. Second section; 1663. Third section; 167. Driving component; 1671. Push-pull rod; 168. Locking assembly; 1681. Mounting base; 1682. Locking component; 1683. Driving mechanism;

[0041] 170. Seismic tie rod;

[0042] 20. Water tank; 30. Ventilation opening;

[0043] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] In related technologies, the cable assemblies of the reactor top structure are generally located above the control rod drive mechanism, providing support and installation channels for all cables above the pressure vessel top cover. However, during reactor operation, there are numerous heat sources in the lower part of the reactor top structure, such as the heat generated by the operation of the control rod drive mechanism and the heat continuously conducted and radiated outward by the high-temperature water in the primary loop through the control rod drive mechanism. This results in a large amount of hot gas flow in the lower part of the reactor top structure. The hot gas flow continuously rises and heats the cables, shortening their lifespan, reducing their safety, and consequently affecting the safety and economic efficiency of reactor operation.

[0051] Based on the above problems, this application proposes an integrated reactor top structure and system to improve the safety of cables, thereby improving the safety and economy of reactor operation.

[0052] Figure 1 shows a front view of an integrated stack-top structure in some embodiments of this application, and Figure 2 shows a top view of an integrated stack-top structure in some embodiments of this application. See also... Figure 1 and Figure 2 An embodiment of the first aspect of this application provides an integrated stack top structure 10, including a pressure vessel top cover 110, a control rod drive mechanism 120, a lifting device assembly 130, a seismic support assembly 140, a cable assembly 150, and a flow guide baffle assembly 160. The lifting device assembly 130 includes a plurality of lifting rods 131 connected to the pressure vessel top cover 110. The seismic support assembly 140 is located above the pressure vessel top cover 110 and is fixedly connected to the plurality of lifting rods 131. The control rod drive mechanism 120 is installed between the pressure vessel top cover 110 and the seismic support assembly 140. The cable assembly 150 is supported above the seismic support assembly 140. The flow guide baffle assembly 160 is located below the seismic support assembly 140 and is fixed to the seismic support assembly 140 or the plurality of lifting rods 131. The flow guide baffle assembly 160 is used to separate the control rod drive mechanism 120 and the cable assembly 150.

[0053] Understandably, the integrated reactor top structure 10 is generally located within the reactor pool 20.

[0054] The control rod drive mechanism 120 may be a high-temperature resistant drive mechanism. The control rod drive mechanism 120 may include a pressure-resistant housing assembly, a claw assembly, a drive rod assembly, a coil assembly, and a rod position detector assembly. The claw assembly is installed inside the pressure-resistant housing assembly, the drive rod assembly is located inside the pressure-resistant housing assembly and passes through the claw assembly, the coil assembly is fitted onto the outside of the pressure-resistant housing assembly, and the rod position detector assembly is mounted on the pressure-resistant housing assembly near the top of the control rod drive mechanism 120.

[0055] The main function of the cable assembly 150 is to provide support and installation channels for all cables on the top of the pressure vessel.

[0056] The seismic support assembly 140 includes a seismic ring and a seismic plate. A hanger 131 passes through and is fixed on the seismic ring. A control rod drive mechanism 120 is fixed on the inner edge of the seismic ring through the seismic plate. A cable assembly 150 is supported on the seismic ring. A flow guide baffle assembly 160 can be fixed on the seismic ring.

[0057] In the integrated reactor top structure 10 provided in this application, the cable assembly 150 is supported above the seismic support assembly 140; the flow guide baffle assembly 160 is located below the seismic support assembly 140 and is fixed to the seismic support assembly 140 or multiple hangers 131. The flow guide baffle assembly 160 is used to separate the control rod drive mechanism 120 and the cable assembly 150. Thus, when the reactor is running, the flow guide baffle assembly 160 can prevent the hot gas flow at the bottom of the integrated reactor top structure 10 from continuing to rise, causing the hot gas flow to disperse along the flow guide baffle assembly 160 to the periphery of the integrated reactor top structure 10, thereby preventing the hot gas flow from directly rising to the cable assembly 150. This reduces the impact of the hot gas flow on the cable, improves the cable safety, enhances the safety and economy of the integrated reactor top structure 10, and ultimately improves the safety and economy of reactor operation. Furthermore, the components of the reactor top structure in this application are interconnected. During normal use and during opening and closing of the cover, the components of the reactor top structure exist as a whole, without the need to dismantle or disassemble any individual component, thereby achieving the integration of the reactor top structure and improving the safety and economy of reactor operation. In addition, the pressure vessel top cover 110 of this application is connected to multiple lifting rods 131 of the lifting assembly 130. The seismic support assembly 140 is located above the pressure vessel top cover 110 and is connected to multiple lifting rods 131. The control rod drive mechanism 120 is installed between the pressure vessel top cover 110 and the seismic support assembly 140. There is a large gap between the multiple lifting rods 131, which is conducive to sufficient air convection. Without the need for a reactor top ventilation structure, the air convection requirements of the high-temperature control rod drive mechanism during self-cooling can be met, which helps to reduce the weight of the entire reactor top structure, simplify the reactor top structure, improve the convenience of reactor top maintenance during reactor shutdown and refueling, reduce refueling time and personnel radiation dose, further improve the safety and economy of the reactor top structure, and thus further improve the safety and economy of reactor operation.

[0058] like Figure 3 As shown, in some embodiments, there are multiple control rod drive mechanisms 120; the flow guide baffle assembly 160 includes a baffle 161, which is fixed to the seismic support assembly 140 or multiple hangers 131. Multiple openings 1610 are formed on the baffle 161 for the tops of the multiple control rod drive mechanisms 120 to pass through. The baffle 161 can separate the multiple control rod drive mechanisms 120 from the cable assembly 150, and the openings 1610 in the baffle 161 facilitate the installation of the control rod drive mechanisms 120.

[0059] like Figure 3 and Figure 4As shown, in some embodiments, the flow guide baffle assembly 160 further includes a bracket 162, which is fixed to the seismic support assembly 140 or multiple hangers 131. The baffle 161 is connected to the bracket 162. Specifically, the bracket 162 may be a hollow frame structure, with the baffle 161 disposed in the middle of the bracket 162. The bracket 162 may be fixed to the bottom of the seismic support assembly 140. The bracket 162 may also be fixed to multiple hangers 131 via multiple clamping ring assemblies 163. For example, there may be three clamping ring assemblies 163, which are circumferentially spaced on the bracket 162 and are fixedly connected to the three hangers 131 one-to-one, thereby fixing the entire flow guide baffle assembly 160 to the multiple hangers 131. The bracket 162 facilitates the assembly and disassembly of the baffle 161.

[0060] like Figure 3 As shown, the retaining ring assembly 163 further includes a connecting frame 1631 and a retaining clamp 1632. The connecting frame 1631 is fixed on the bracket 162, and the retaining clamp 1632 is disposed at the end of the connecting frame 1631 away from the bracket 162. When installing the flow guide baffle assembly 160, the flow guide baffle assembly 160 can be conveniently fixed to the multiple hangers 131 by clamping the retaining clamps 1632 on the multiple retaining ring assemblies 163 to the hangers 131.

[0061] like Figure 2 and Figure 3As shown, in some embodiments, multiple control rod drive mechanisms 120 are arranged in an array along a first direction X and a second direction Y, and the first direction X and the second direction Y intersect; the partition 161 includes multiple sub-partitions 1611, which are spaced apart along the first direction X, and each sub-partition 1611 extends along the second direction Y; both ends of each sub-partition 1611 are hinged to the bracket 162; a row of control rod drive mechanisms 120 is arranged between each pair of adjacent sub-partitions 1611; multiple grooves 1612 are formed on the opposite edges 1611a of each pair of adjacent sub-partitions 1611, and two grooves 1612 on the opposite edges 1611a together form an opening 1610. By dividing the partition 161 into multiple sub-partitions 1611, with both ends of each sub-partition 1611 hinged to the bracket 162, and multiple grooves 1612 formed on the opposite edges 1611a of each pair of adjacent sub-partitions 1611, the sub-partitions 1611 can rotate relative to the bracket 162. The multiple sub-partitions 1611 can rotate from a horizontal state to a vertical state, creating a passage between adjacent sub-partitions 1611, thereby facilitating the installation and maintenance of multiple control rod drive mechanisms 120. When the installation or maintenance of multiple control rod drive mechanisms 120 is completed, the multiple sub-partitions 1611 can rotate from a vertical state to a horizontal state, and the multiple sub-partitions 1611 re-separate the multiple control rod drive mechanisms 120 and the cable assembly 150.

[0062] like Figure 4 As shown, in some embodiments, each sub-partition 1611 is mounted on a bracket 162 via a mounting assembly, which includes a hinge 164, a first connecting rod 165, and a second connecting rod 166. Two hinges 164 are fixed to the bracket 162 and are located at both ends of a sub-partition 1611. One end of the first connecting rod 165 is rotatably connected to one hinge 164, and the other end is fixedly connected to one end of a sub-partition 1611. One end of the second connecting rod 166 is rotatably connected to the other hinge 164, and the other end is fixedly connected to the other end of a sub-partition 1611. The mounting assembly allows for convenient mounting of each sub-partition 1611 onto the bracket 162 and convenient hinge connection of both ends of each sub-partition 1611 to the bracket 162.

[0063] like Figure 3 and Figure 4As shown, in some embodiments, the flow guide baffle assembly 160 further includes a drive member 167 connected to all sub-baffles 1611. The drive member 167 is used to drive all sub-baffles 1611 to rotate synchronously. Specifically, the drive member 167 may be located on the same side of all sub-baffles 1611 and connected to all sub-baffles 1611. The drive member 167 can be used to drive all sub-baffles 1611 to rotate synchronously in a first position and a second position. In the first position, all sub-baffles 1611 are perpendicular to the central axis of the control rod drive mechanism 120 (i.e., all sub-baffles 1611 are in a horizontal state). In the second position, all sub-baffles 1611 are parallel to the central axis of the control rod drive mechanism 120 (i.e., all sub-baffles 1611 are in a vertical state). Thus, when it is necessary to inspect the structure near the flow guide baffle assembly 160 (such as the rod position detector assembly of the control rod drive mechanism 120), all sub-baffles 1611 can be driven to rotate synchronously by the drive component 167, so that all sub-baffles 1611 can be changed from the first position to the second position. In this way, a passage will be opened between each two adjacent sub-baffles 1611, which facilitates the installation and maintenance of multiple control rod drive mechanisms 120 and makes it easier for staff to operate and maintain.

[0064] like Figure 4 As shown, in some embodiments, the drive member 167 is located on the same side of all the second links 166 and is connected to all the second links 166, so that the drive member 167 is indirectly connected to the sub-partition 1611 through the second links 166. The drive member 167 can drive all the second links 166 to rotate relative to the corresponding hinge support 164, thereby driving all the sub-partitions 1611 to rotate synchronously in the first position and the second position.

[0065] like Figure 5 As shown, the second link 166 can be further configured as a reverse Z-shaped structure. Specifically, the second link 166 includes a first segment 1661, a second segment 1662, and a third segment 1663 connected between the first segment 1661 and the second segment 1662. The third segment 1663 is perpendicular to the first segment 1661 and the second segment 1662. One end of the first segment 1661 is fixedly connected to the sub-partition 1611, and the other end of the first segment 1661 is rotatably connected to the hinge support 164. The second segment 1662 is fixedly connected to the driving member 167. In this way, the driving member 167 drives the first segment 1661 to rotate relative to the hinge support 164 through the second segment 1662, thereby driving the sub-partition 1611 to rotate. This allows the driving member 167 to easily drive all sub-partitions 1611 to rotate synchronously in the first and second positions.

[0066] like Figure 5 and Figure 7As shown, in some embodiments, the drive member 167 includes a push-pull rod 1671, which is fixedly connected to the second segment 1662. The push-pull rod 1671 is configured to move along the third direction Z to drive the second link 166 to rotate relative to the hinge support 164, thereby driving the sub-partition 1611 to rotate in the first position and the second position.

[0067] like Figure 6 and Figure 7 As shown, in some embodiments, the flow guide baffle assembly 160 further includes a locking assembly 168. The locking assembly 168 includes a mounting base 1681, a locking member 1682, and a driving mechanism 1683. The mounting base 1681 is fixed on the bracket 162. The locking member 1682 is movably disposed on the mounting base 1681. The driving mechanism 1683 is disposed on the mounting base 1681 and is connected to the locking member 1682. The driving mechanism 1683 is used to drive the locking member 1682 to move toward the driving member 167 and cooperate with the driving member 167 to lock the driving member 167, thereby facilitating the locking of all sub-baffles 1611 in a first position or a second position.

[0068] Furthermore, the locking member 1682 is provided with a first locking hole and a second locking hole (not shown in the figure) for cooperating with the driving member 167. When the first locking hole cooperates with the driving member 167, all sub-partitions 1611 are locked in the first position. When the second locking hole cooperates with the driving member 167, all sub-partitions 1611 are locked in the second position.

[0069] like Figure 1 and Figure 2 As shown, in some embodiments, the integrated reactor top structure 10 further includes a seismic brace 170. One end of the seismic brace 170 is connected to the seismic support assembly 140, and the other end is used to connect to the wall of the water tank 20. By providing the seismic brace 170, the seismic performance of the integrated reactor top structure 10 can be improved, thereby enhancing the safety of reactor operation. Specifically, the other end of the seismic brace 170 can be connected to an embedded part on the wall of the water tank 20, thus facilitating the connection of the seismic brace 170 to the wall of the water tank 20.

[0070] In some embodiments, such as Figure 1As shown, the cable assembly 150 includes a cable tray 151, a cable bridge 152, a cable adapter plate 153, and a cable grid 154. The cable tray 151 is supported above the seismic support assembly 140. One side of the cable bridge 152 is supported above the seismic support assembly 140, and the other side of the cable bridge 152 is used to support the top of the water tank 20. The cable adapter plate 153 is fixed to the cable tray 151. The cable grid 154 is distributed around the control rod drive mechanism 120 and suspended below the seismic support assembly 140. The cable tray 151 provides support for all cables on the top of the pressure vessel cover 110. The cable bridge 152 facilitates the guidance of cables on the cable tray 151 to the cable connection plate near the water tank 20, simplifying cable connection. The cable adapter plate 153 reduces the number of cables guided to the cable connection plate near the water tank 20, reducing the difficulty of cable laying and arrangement in the top area of ​​the stack. The reactor pressure vessel is equipped with a core measurement system. The pressure vessel top cover 110 is equipped with a connector for the core measurement system. The connector is connected to the corresponding cable of the core measurement system. By setting up a cable grid 154, the laying and arrangement of cables related to the core measurement system can be facilitated.

[0071] In some embodiments, such as Figure 1 As shown, the lifting assembly 130 also includes a lifting component 132, located above the cable assembly 150 and connected to multiple lifting booms 131. The lifting assembly 130 is a dedicated lifting tool for transporting the integrated reactor top structure. The lifting component 132 facilitates the connection between the lifting assembly 130 and the lifting device, enabling rapid lifting and installation of the reactor top structure during reactor refueling and maintenance.

[0072] In some embodiments, such as Figure 8 As shown, a connector 121 is provided on the top of the control rod drive mechanism 120. The connector 121 is located above the flow guide baffle assembly 160 and is used to connect a cable. A thermal protection sleeve (not shown in the figure) is fitted over the connector 121. The connector 121 can be a cable connector, such as an electrical connector, and the cable can be a rod control rod position cable. The thermal protection sleeve is fitted over the connector 121, and the cable connects to the connector 121. The thermal protection sleeve can be fitted over the position where the cable extends out of the connector 121, which helps to insulate the cable from heat.

[0073] In some embodiments, the length of the thermal protection sleeve is 50mm to 200mm, which is beneficial for both cable insulation and cable replacement.

[0074] In some embodiments, the partition 161 is made of stainless steel and has a thickness of 3mm to 20mm. Using stainless steel for the partition 161 provides rust resistance and ensures sufficient strength for earthquake resistance. The 3mm to 20mm thickness of the partition 161 also guarantees its strength and facilitates its disassembly and replacement.

[0075] like Figure 1 As shown, an embodiment of the second aspect of this application provides an integrated stack top system, including the integrated stack top structure 10 described in the first aspect.

[0076] The integrated reactor top system provided in this application includes an integrated reactor top structure 10. In the integrated reactor top structure 10, a cable assembly 150 is supported above a seismic support assembly 140; a flow guide baffle assembly 160 is located below the seismic support assembly 140 and is fixed to the seismic support assembly 140 or multiple booms 131. The flow guide baffle assembly 160 is used to separate the control rod drive mechanism 120 and the cable assembly 150. Thus, when the reactor is running, the flow guide baffle assembly 160 can prevent the hot gas flow at the bottom of the integrated reactor top structure 10 from continuing to rise, causing the hot gas flow to disperse along the flow guide baffle assembly 160 to the periphery of the integrated reactor top structure 10, thereby preventing the hot gas flow from directly rising to the cable assembly 150. This reduces the impact of the hot gas flow on the cable, improves the cable safety, enhances the safety and economy of the integrated reactor top system, and ultimately improves the safety and economy of reactor operation.

[0077] In some embodiments, such as Figure 1 and Figure 2 As shown, the integrated reactor top system also includes a water pool 20, within which the integrated reactor top structure 10 is located. Ventilation openings 30 are formed on the walls of the water pool 20. These openings 30 are located between the coil assembly and rod position detector assembly of the control rod drive mechanism 120. Multiple ventilation openings 30 are spaced apart along the circumference of the pressure vessel top cover 110. Specifically, there may be three ventilation openings 30, evenly spaced along the circumference of the pressure vessel top cover 110. The ventilation openings 30 can be connected to a continuous containment ventilation system. This system ventilates and cools the integrated reactor top structure 10 through the ventilation openings 30, ensuring the safe operation of the control rod drive mechanism 120, improving the reliability and economy of the reactor top system, and consequently, improving the reliability and economy of reactor operation. The spaced distribution of multiple ventilation openings 30 along the circumference of the pressure vessel top cover 110 allows for more uniform heat dissipation from the control rod drive mechanism 120 and the reactor top region, further enhancing the reliability and economy of reactor operation.

[0078] In some embodiments, the cross-section of the vent 30 is circular or square, the diameter or side length of the vent 30 is between 100mm and 1000mm, and the ventilation volume of each vent 30 is 5000m³. 3 / h~9000m 3 / h enables efficient heat dissipation of the control rod drive mechanism 120 and the reactor top area, further improving the reliability and economy of the integrated reactor top system, and thus further improving the reliability and economy of reactor operation.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An integrated head structure (10) characterized by, It includes a pressure vessel top cover (110), a control rod drive mechanism (120), a lifting device assembly (130), a seismic support assembly (140), a cable assembly (150), and a flow guide baffle assembly (160). The lifting assembly (130) includes a plurality of lifting rods (131), all of which are connected to the pressure vessel top cover (110). The seismic support assembly (140) is located above the pressure vessel top cover (110) and is fixedly connected to the plurality of lifting rods (131). The control rod drive mechanism (120) is installed between the pressure vessel top cover (110) and the seismic support assembly (140); The cable assembly (150) is supported above the seismic support assembly (140); The flow guide baffle assembly (160) is located below the seismic support assembly (140) and is fixed to the seismic support assembly (140) or the plurality of hangers (131). The flow guide baffle assembly (160) is used to separate the control rod drive mechanism (120) and the cable assembly (150). The number of control rod drive mechanisms (120) is multiple; the multiple control rod drive mechanisms (120) are arranged in an array along a first direction (X) and a second direction (Y), and the first direction (X) and the second direction (Y) intersect. The flow guide baffle assembly (160) includes a baffle (161) and a bracket (162), the bracket (162) being fixed to the seismic support assembly (140) or the plurality of hangers (131); the baffle (161) has a plurality of openings (1610) through which the tops of the plurality of control rod drive mechanisms (120) pass respectively. The partition (161) includes a plurality of sub-partitions (1611), which are spaced apart along the first direction (X), and each sub-partition (1611) extends along the second direction (Y); both ends of each sub-partition (1611) are hinged to the bracket (162); a row of control rod drive mechanisms (120) is arranged between each pair of adjacent sub-partitions (1611); a plurality of grooves (1612) are formed on the opposite edges (1611a) of each pair of adjacent sub-partitions (1611), and two grooves (1612) on the two opposite edges (1611a) and oppositely distributed together surround the opening (1610).

2. The integrated stack top structure (10) according to claim 1, characterized in that, Each of the sub-partitions (1611) is mounted on the bracket (162) by a mounting assembly, the mounting assembly including a hinge support (164), a first connecting rod (165), and a second connecting rod (166); two hinge supports (164) are fixed on the bracket (162) and are located at both ends of a sub-partition (1611); one end of the first connecting rod (165) is rotatably connected to one of the hinge supports (164), and the other end of the first connecting rod (165) is fixedly connected to one end of a sub-partition (1611); one end of the second connecting rod (166) is rotatably connected to the other hinge support (164), and the other end of the second connecting rod (166) is fixedly connected to the other end of a sub-partition (1611).

3. The integrated stack top structure (10) according to claim 1 or 2, characterized in that, The flow guide baffle assembly (160) further includes a drive member (167) connected to all the sub-baffles (1611) and used to drive all the sub-baffles (1611) to rotate synchronously.

4. The integrated stack top structure (10) according to claim 3, characterized in that, The drive member (167) is located on the same side of all the sub-partitions (1611) and is connected to all the sub-partitions (1611); the drive member (167) is used to drive all the sub-partitions (1611) to rotate synchronously in a first position and a second position; in the first position, all the sub-partitions (1611) are perpendicular to the central axis of the control rod drive mechanism (120); in the second position, all the sub-partitions (1611) are parallel to the central axis of the control rod drive mechanism (120).

5. The integrated stack top structure (10) according to claim 3, characterized in that, The flow guide baffle assembly (160) further includes a locking assembly (168), which includes a mounting base (1681), a locking member (1682), and a driving mechanism (1683). The mounting base (1681) is fixed on the bracket (162), the locking member (1682) is movably disposed on the mounting base (1681), and the driving mechanism (1683) is disposed on the mounting base (1681). The driving mechanism (1683) is connected to the locking member (1682) and is used to drive the locking member (1682) to move toward the driving member (167) and cooperate with the driving member (167) to lock the driving member (167).

6. The integrated stack top structure (10) according to claim 1, characterized in that, The integrated stack top structure (10) also includes an anti-seismic tie rod (170), one end of which is connected to the anti-seismic support assembly (140), and the other end of which is used to connect to the wall of the water tank (20).

7. The integrated stack top structure (10) according to claim 1, characterized in that, The cable assembly (150) includes a cable tray (151), a cable bridge (152), a cable adapter plate (153), and a cable grid (154); the cable tray (151) is supported above the seismic support assembly (140); one side of the cable bridge (152) is supported above the seismic support assembly (140), and the other side of the cable bridge (152) is used to support the top of the water tank (20); the cable adapter plate (153) is fixed on the cable tray (151); the cable grid (154) is distributed around the control rod drive mechanism (120) and suspended below the seismic support assembly (140).

8. The integrated stack top structure (10) according to claim 1, characterized in that, The lifting assembly (130) also includes a lifting assembly (132) located above the cable assembly (150) and connected to the plurality of lifting rods (131).

9. The integrated stack top structure (10) according to claim 1, characterized in that, The top of the control rod drive mechanism (120) is provided with a connector (121), which is located above the flow guide baffle assembly (160). The connector (121) is used to connect cables, and a heat protection sleeve is provided on the outside of the connector (121).

10. The integrated stack top structure (10) according to claim 9, characterized in that, The length of the heat protection sleeve is 50mm to 200mm.

11. The integrated stack top structure (10) according to any one of claims 1 to 2, characterized in that, The partition (161) is made of stainless steel and has a thickness of 3mm to 20mm.

12. An integrated reactor top system, characterized in that, Includes the integrated stack top structure (10) according to any one of claims 1 to 11.

13. The integrated reactor top system according to claim 12, characterized in that, The integrated stack top system also includes a water tank (20), and the integrated stack top structure (10) is located within the water tank (20); The water tank (20) has a ventilation opening (30) on its wall; the ventilation opening (30) is located between the coil assembly and the rod position detector assembly of the control rod drive mechanism (120); The number of ventilation openings (30) is multiple, and the multiple ventilation openings (30) are distributed at intervals along the circumferential direction of the pressure vessel top cover (110).

14. The integrated reactor top system according to claim 13, characterized in that, The cross-section of the ventilation opening (30) is circular or square, and the diameter or side length of the ventilation opening (30) is between 100mm and 1000mm.

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