Integrated reactor top assembly for nuclear power station and reactor

Abstract

The invention provides an integrated reactor top assembly for a nuclear power plant and a reactor, the reactor top assembly comprises a shroud assembly, a cable bridge and a top cover lifting appliance, one end of the shroud assembly is installed on a top cover of a reactor pressure vessel, the other end of the shroud assembly extends to a position above a refueling pool, and the shroud assembly surrounds the outer side of a control rod driving mechanism; the cable bridge is mounted on the refueling pool; the top cover lifting appliance is installed above the shroud assembly, one end of the top cover lifting appliance is connected with a reactor pressure vessel top cover, at least two sliding rails are arranged on the outer wall of the shroud assembly in the axial direction of the shroud assembly, and at least part of the tops of the sliding rails extend and are fixed to the top cover lifting appliance. Wherein at least one air inlet is formed in the side, close to the top cover of the reactor pressure vessel, of the shroud assembly, external cooling gas enters the shroud assembly through the air inlet and is discharged from the top of the shroud assembly, and at least one cable connecting plate is arranged on the upper portion of the shroud assembly and used for fixing a cable connector. According to the reactor top assembly, a fan and an air pipe are omitted, and the arrangement of a cooling system is greatly simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, and in particular to an integrated stack top assembly and a reactor for a nuclear power plant. Background Art

[0002] The integrated top assembly is installed above the reactor pressure vessel cover. It integrates top cooling and ventilation, cable support and laying, unified lifting and transfer of the reactor pressure vessel cover, and provides personnel with an operating channel and other functions.

[0003] At present, newly built and in-service nuclear power plants mainly use magnetic lift control rod drive mechanisms. The coil assembly in the magnetic lift control rod drive mechanism is the main component for realizing the state control of the control rod assembly. Different action controls are realized by passing different timing currents through the drive mechanism coil.

[0004] But at the same time, the energized coil will generate a lot of heat, which is the main source of heat at the top of the pile. Another part of the heat at the top of the pile comes from natural convection heat transfer and thermal radiation at the top of the pile, which affects the temperature field distribution of the entire top of the pile.

[0005] The operating experience of nuclear power plants and related research have shown that the operating temperature has an important impact on the life and performance of the control rod drive mechanism working coil. Based on this, most reactors are equipped with a control rod drive mechanism (CRDM) cooling system to remove the heat generated by the CRDM operation through forced air cooling to maintain the normal operating temperature of the CRDM. The CRDM cooling system is generally composed of a fan, air duct and supporting electrical system. The existence of the cooling system causes the overall size of the top assembly to increase, which is not conducive to the top design and maintenance of the stack.

[0006] At the same time, the integrated top assembly for nuclear power plants is equipped with power cables and control cables for multiple systems and equipment such as control rod drive mechanisms, core measurement systems, and loose parts monitoring systems. Usually, one end of these cables is connected to the electrical equipment on the top of the reactor, and the other end is laid through cable support structures such as cable trays and cable bridges to guide them to the operating platform of the reactor building. Due to the large number of cables on the top of the reactor, the corresponding cable trays, cable bridges and other supporting structures are large in size, occupying more space on the top of the reactor, which has an adverse impact on the design, manufacture and maintenance of the integrated top assembly for nuclear power plants, and also has an adverse impact on the application of integral bolt tensioners.

[0007] Based on this, the inventor of the present application proposes an integrated stack top assembly and reactor for a nuclear power plant, in order to solve the above technical problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the defect that the design of the top cooling system in the prior art is not conducive to the integrated design, manufacture and maintenance of the top, and to provide an integrated top assembly and reactor for a nuclear power plant.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The present invention provides an integrated stack top assembly for a nuclear power plant, which is characterized by comprising:

[0011] A shroud assembly, one end of which is mounted on the reactor pressure vessel top cover and the other end of which extends above the refueling pool, wherein the shroud assembly surrounds the outside of the control rod drive mechanism;

[0012] A cable tray is installed on the refueling pool;

[0013] A top cover hanger is installed above the shroud assembly and connected to the reactor pressure vessel top cover at one end. The outer wall of the shroud assembly is provided with at least two slide rails along its axial direction. The top of the slide rails at least partially extends and is fixed on the top cover hanger; wherein,

[0014] The shroud assembly is provided with at least one air inlet on a side close to the reactor pressure vessel top cover, and external cooling air enters the shroud assembly through the air inlet and is discharged at the top of the shroud assembly. At least one cable connection plate is provided on the upper part of the shroud assembly for fixing cable connectors.

[0015] According to one embodiment of the present invention, the shroud assembly comprises a barrel, the barrel has a receiving cavity therein, the receiving cavity is used to accommodate the control rod drive mechanism, and at least two slide rails are arranged on the outer wall of the receiving cavity and are spaced apart;

[0016] The number of the air inlets is at least two, and at least two of the air inlets are arranged at intervals around the circumference of the cylinder, and the air inlets are connected to the accommodating cavity.

[0017] According to an embodiment of the present invention, at least one inspection window is further provided on the cylinder, and the inspection window is communicated with the accommodating cavity.

[0018] According to one embodiment of the present invention, the cable tray is slidably matched with a guide rail provided on the refueling pool to approach or move away from the shroud assembly.

[0019] According to one embodiment of the present invention, the refueling water pool is provided with one guide rail on each of the opposite sides of the shroud assembly, and the cable tray is slidably matched with the guide rail; wherein,

[0020] When the reactor is in operation, the cable tray is at least partially moved or flipped to the shroud assembly to achieve the cable connector connection operation; when the reactor is shut down for refueling, the cable connector is disconnected and the cable tray is moved or flipped to a side away from the shroud assembly.

[0021] According to one embodiment of the present invention, the cable connection plate is provided on one side of the shroud assembly above the refueling pool and close to the cable tray. When the reactor is in operation, the cable tray moves to the cable connection plate to connect the cables in the shroud assembly to the cable tray.

[0022] According to one embodiment of the present invention, the cable bridge comprises a frame body and a cable grid arranged on the frame body, wherein the cable grid is arranged on a side of the frame body facing the surrounding tube assembly for supporting and fixing the rear end cables.

[0023] According to one embodiment of the present invention, a cable support and at least one layer of cable tray are provided in the shroud assembly, the cable support is provided above the control rod drive mechanism, and the cable tray is provided above the cable support;

[0024] The cables on the control rod drive mechanism are connected to the cable connection plate through the cable support and the cable tray, and are connected to the corresponding cables on the cable tray.

[0025] According to one embodiment of the present invention, the number of the cable trays is at least two, and at least two of the cable trays are stacked along the axial direction of the shroud assembly to support different types of cables.

[0026] According to one embodiment of the present invention, the cable support comprises a support and a steel cable, the steel cable is connected to the support, and the steel cable is in a grid structure;

[0027] The cable moves horizontally along the steel cable to the inner wall side of the enclosure assembly and upwardly passes through the cable tray to be connected to the cable connection plate.

[0028] According to one embodiment of the present invention, the steel cables are composed of at least two layers and the at least two layers of the steel cables are spaced apart along the axial direction of the shroud assembly.

[0029] The present invention also provides a reactor, comprising the integrated reactor top assembly for a nuclear power plant as described above.

[0030] The positive and progressive effects of the present invention are:

[0031] The integrated top stack assembly for a nuclear power plant of the present invention eliminates fans and air ducts, and relies on the air inlet and top air outlet provided on the shroud assembly to form the flow field boundary of the CRDM natural convection cooling, which greatly simplifies the layout of the cooling system, reduces the operation and maintenance work of the top stack, and is beneficial to the daily inspection and maintenance of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0033] Figure 1 It is a schematic diagram of the arrangement of the integrated top assembly of a nuclear power plant according to the present invention;

[0034] Figure 2 for Figure 1 A top view of

[0035] Figure 3 It is a cross-sectional view at one angle of the integrated top assembly for a nuclear power plant of the present invention;

[0036] Figure 4 It is a schematic diagram of the structure of the cable support member in the shroud assembly of the present invention;

[0037] Figure 5 The figure is a schematic diagram of the arrangement of the cable tray in the enclosure assembly of the present invention.

[0038] 1. surrounding cylinder assembly; 11. slide rail; 12. air inlet; 13. cylinder body; 131. accommodating cavity; 132. inspection window; 14. cable connection plate; 15. cable support; 151. supporting member; 152. steel cable; 16. cable tray;

[0039] 2. Reactor pressure vessel top cover;

[0040] 3. Refueling pool; 31. Guide rail;

[0041] 4. Control rod drive mechanism;

[0042] 5. Cable tray; 51. Frame; 52. Cable grid;

[0043] 6. Top cover hanger. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] Please refer to Figures 1 to 5 The present invention proposes an integrated reactor top assembly for a nuclear power plant, the reactor top assembly comprising a shroud assembly 1, a cable tray 5 and a top cover hanger 6. One end of the shroud assembly 1 is mounted on the reactor pressure vessel top cover 2, and the other end extends to above the refueling pool 3. The shroud assembly 1 surrounds the outside of a control rod drive mechanism 4.

[0047] Specifically, the shroud assembly 1 is mounted on the reactor pressure vessel top cover 2 via a flange. Optionally, other connection methods may be used, such as snap-fit, welding, etc., which are not limited here.

[0048] The cable tray 5 is installed on the refueling pool 3; the top cover hanger 6 is installed above the shroud assembly 1 and one end is connected to the reactor pressure vessel top cover 2. The outer wall of the shroud assembly 1 is provided with at least two slide rails 11 along its axial direction, and the top of the slide rail 11 at least partially extends to the top cover hanger 6 to increase the guide length. For example, the integral bolt tensioner can be slidably guided with the slide rail 11 to achieve precise positioning on the pressure vessel top cover 2.

[0049] The shroud assembly 1 is provided with at least one air inlet 12 on one side close to the reactor pressure vessel top cover 2 , and external cooling air enters the shroud assembly 1 through the air inlet 12 and is discharged at the top of the shroud assembly 1 .

[0050] At least one cable connection plate 14 is provided on the upper portion of the shroud assembly 1 for fixing the cable connector.

[0051] In view of the problems that the integrated top stack assembly for traditional nuclear power plants is complex in structure, large in size and difficult in operation and maintenance, the present invention eliminates the fan and air duct in the CRDM cooling system, also eliminates the external cable tray 16, reduces the top stack working platform, and changes the connection method of the cable tray 5, thereby significantly reducing the structural size of the integrated top stack assembly for nuclear power plants, so that an integral bolt tensioning machine can be used for the top stack assembly.

[0052] Specifically, the present invention sets an air inlet 12 at one end of the shroud assembly 1 close to the reactor pressure vessel top cover 2. The shroud assembly 1 utilizes the chimney effect to effectively enhance natural convection and facilitate CRDM heat dissipation and cooling. When the reactor is in operation, the air inlet 12 is opened, and external air enters the shroud assembly 1 from the air inlet 12, flows upward over the surface of the control rod drive mechanism 4 to take away heat, and flows out from the top of the shroud assembly 1, thereby utilizing natural convection to cool the control rod drive mechanism 4.

[0053] That is, the shroud assembly 1 surrounds the periphery of the control rod drive mechanism 4 and also serves as the flow field boundary of the cooling system of the control rod drive mechanism 4. This method has a passive characteristic and can avoid the problem of cooling system failure caused by traditional fan failure.

[0054] The number and size of the air inlets 12 can be determined based on actual simulation or calculation and are not limited here.

[0055] In one embodiment, the surrounding cylinder assembly 1 includes a cylinder body 13, which has a accommodating cavity 131, and at least two slide rails 11 are arranged on the outer wall of the accommodating cavity 131 and are spaced apart; the number of air inlets 12 is at least two, and at least two air inlets 12 are spaced apart circumferentially around the cylinder body 13, and the air inlets 12 are connected to the accommodating cavity 131.

[0056] It can be seen that the number and structural form of the slide rails 11 can be matched according to design requirements and are not limited here.

[0057] Here, the number of slide rails 11 is two as an example for explanation, and the two slide rails 11 are evenly distributed around the outer wall of the accommodating cavity 131. The top cover hanger 6 is arranged on the top of the cylinder 13 and one end is fixedly matched with the slide rail 11 to increase the guide length. The slide rail 11 can be used for, but not limited to, an integral bolt tensioning machine.

[0058] Specifically, the cylinder 13 may be a combination of multiple sections, and adjacent sections may be detachably connected via flanges using threaded connectors, or may be welded, etc., which is not limited here.

[0059] Furthermore, at least one inspection window 132 is provided on the cylinder 13, and the inspection window 132 is connected to the accommodating chamber 131. The inspection window 132 facilitates the staff to inspect and observe the interior of the cylinder. The number and location of the inspection windows 132 are not limited here.

[0060] The cable tray 5 is slidably matched with the guide rail 31 provided on the refueling pool 3 to approach or move away from the shroud assembly 1 .

[0061] That is, when the reactor is operating normally or shut down for refueling, the cable tray 5 can be close to or away from the casing assembly 1, so that the space above the reactor pressure vessel top cover 2 can be opened, avoiding interference between the cable tray 5 when the integral bolt tensioner is inserted into the reactor.

[0062] Reference Figure 2 A guide rail 31 is provided on each of the opposite sides of the shroud assembly 1 of the refueling pool 3, and the cable tray 5 is slidably matched with the guide rail 31; wherein, when the reactor is operating normally, the cable tray 5 is at least partially moved or flipped to the side close to the shroud assembly 1; when the reactor is shut down for refueling, the cable tray 5 is moved to the side away from the shroud assembly 1.

[0063] That is, when the reactor is operating normally, the cable tray 5 is close to the shroud assembly 1, which facilitates the cable connector connection operation, that is, the rear end cable on the cable tray 5 side is connected to the cable inside the shroud assembly 1 through the cable connector provided on the cable connection plate 14. Figure 2 When the reactor is stopped for refueling, disconnect the cable connector, and the cable tray 5 is away from the shroud assembly 1 and parked on the operating platform beside the refueling pool 3. Figure 2 Position A in .

[0064] That is, when the reactor is operating normally, the cable tray 5 moves to position B, and the cables in the shroud assembly 1 are connected to the cables on the cable tray 5 side through the cable connector. When the reactor is shut down for refueling, the cable tray 5 moves to position A, and the cable tray 5 does not interfere with the refueling at the shroud assembly 1.

[0065] Optionally, a driving wheel is provided at the bottom of the cable tray 5, and the driving wheel moves on the guide rail 31, thereby approaching or moving away from the surrounding tube assembly 1. In some other embodiments, a motor can also be used to drive the cable tray 5 to slide relative to the guide rail 31.

[0066] The cable tray 5 in the present invention is a translational movement, that is, it is a translational movement on the refueling pool 3 close to or away from the shroud assembly 1. In some optional other embodiments, the cable tray 5 can also be flipped, that is, when the reactor is operating normally, it is flipped to the shroud assembly 1; and when the reactor is shut down for refueling, it is flipped to the side away from the shroud assembly 1.

[0067] In one embodiment, the shroud assembly 1 is provided with a cable connection plate 14 on one side above the refueling pool 3 and close to the cable tray 5. When the reactor operates normally, the cable tray 5 moves to the side close to the cable connection plate 14 to facilitate the connection of the cables in the shroud assembly 1 with the cable tray 5.

[0068] The size of the cable connection plate 14 matches the size of the cable tray 5 on the side facing the shroud assembly 1 , so that when the reactor is operating normally, the cable tray 5 moves to the position of the cable connection plate 14 to facilitate the connection of the cables to the cable tray 5 .

[0069] Please refer to Figures 1 to 5The cable tray 5 includes a frame body 51 and a cable grid 52 arranged on the frame body 51. The cable grid 52 is arranged on a side of the frame body 51 facing the surrounding tube assembly 1, and is used to support and fix the rear end cable.

[0070] That is, the bottom of the frame 51 is slidably matched with the guide rail 31 to drive the frame 51 to approach or move away from the surrounding tube assembly 1. The frame 51 is provided with a cable grid 52 for placing the rear end cables.

[0071] Reference Figure 3 A cable support 15 and at least one layer of cable tray 16 are provided in the enclosure assembly 1. The cable support 15 is provided above the control rod drive mechanism 4, and the cable tray 16 is provided above the cable support 15. The cables on the control rod drive mechanism 4 are connected to the cable connection plate 14 through the cable support 15 and the cable tray 16, and are connected to the corresponding cables on the cable tray 5.

[0072] That is, the cables of the control rod driving mechanism 4 of the present invention are built into the barrel 13 assembly, and the cables are connected to the cable connecting plate 14 on the surrounding barrel assembly 1 through the cable support 15 and the cable tray 16.

[0073] There are at least two cable trays 16 , and at least two cable trays 16 are stacked along the axial direction of the casing assembly 1 to support different types of cables.

[0074] The cable tray 16 is built into the inner part of the shroud assembly 1, installed and supported on the inner wall of the accommodating cavity 131, and at least two cable trays 16 are used to guide and lay the top cables.

[0075] Specifically, at least two cable trays 16 can achieve isolation of high-voltage and low-voltage cables, as well as isolation of Class 1E cables and non-Class 1E cables. The top cable is laid upward from the cable support 15 along the inner wall side of the accommodating cavity 131 to the cable tray 16 and continues upward to connect with the cable connection plate 14 on the casing assembly 1.

[0076] Correspondingly, the cable connection plate 14 includes a plurality of connector panels or partitions for installing and fixing cable connectors, and can achieve isolation of strong and weak currents as well as Class 1E cables and non-Class 1E cables.

[0077] In one embodiment, the cable support 15 includes a support 151 and a steel cable 152, the steel cable 152 is connected to the support 151, and the steel cable 152 is in a grid structure; the cable moves horizontally along the steel cable 152 to the inner wall side of the tube assembly 1 and upwardly connects to the cable connection plate 14 through the cable tray 16.

[0078] The steel cable 152 is arranged above the support 151. The steel cable 152 is arranged in a grid structure in the casing assembly 1, so as to avoid the up and down movement space of the control rod drive mechanism 4. The cable is laid horizontally on the steel cable 152 to the inner wall side close to the accommodating cavity 131 and then upward to the cable tray 16, and finally connected to the cable connecting plate 14 upward.

[0079] Specifically, each grid node is composed of an anti-seismic ring and a tie rod. The anti-seismic ring is sleeved on the top of the CRDM travel housing, and the tie rod is used to connect the anti-seismic ring. The steel cable 152 is located above the support 151 and is used to guide and lay the cable of the control rod drive mechanism 4.

[0080] The built-in cable tray 16 can fully utilize the internal space of the surrounding tube assembly 1, reduce the occupation of the external space of the surrounding tube assembly 1, and effectively reduce the peripheral size of the stack top assembly.

[0081] The steel cables 152 are arranged in a grid shape to maximize the flow area, and cooperate with the support members 151 to reduce air flow resistance while ensuring earthquake resistance.

[0082] Furthermore, the support member 151 may be provided with a multi-layer steel cable 152 structure to ensure cable partitioning and isolation, while the regular grid structure facilitates the subsequent maintenance and replacement of the CRDM.

[0083] The present invention also provides a reactor, comprising the above-mentioned integrated reactor top assembly for a nuclear power plant.

[0084] In summary, the integrated top assembly and reactor for a nuclear power plant proposed by the present invention have at least the following advantages:

[0085] First, natural air convection is used to cool the control rod drive mechanism 4, eliminating the traditional fan and air duct, and reducing the structural size of the stack top assembly.

[0086] 2. The control rod drive mechanism 4 uses natural convection cooling to discharge the heat generated during operation. This method has a passive characteristic and can avoid cooling system failure caused by fan failure.

[0087] 3. Use a movable cable tray 5. When the reactor is operating normally, the cable tray 5 is close to the shroud assembly 1, and the cables on the top of the reactor are connected to the cables on the cable tray 5 at the cable connection plate 14. When the reactor is stopped for refueling, the cable connector is disconnected, and the cable tray 5 is parked on the operating platform beside the pool away from the shroud assembly 1. By moving horizontally, the space above the reactor pressure vessel top cover 2 is opened, avoiding interference between the integral bolt tensioner and the cable tray 5 when entering the reactor.

[0088] Fourth, the cable tray 16 is built-in, which fully utilizes the internal space of the surrounding tube assembly 1, reduces the occupation of the external space of the surrounding tube assembly 1, and effectively reduces the peripheral size of the stack top assembly.

[0089] 5. The cable support 15 adopts a multi-layer steel cable 152 structure to ensure cable partitioning and isolation. At the same time, the regular grid structure facilitates the maintenance and replacement of the CRDM in the later stage.

[0090] 6. A slide rail 11 is arranged on the outer wall of the shroud assembly 1. The rail is used for guiding and positioning, thereby reducing the risk of collision between the integral bolt tensioner and the integrated stack top assembly. This is also conducive to achieving accurate positioning of the integral bolt tensioner on the reactor pressure vessel top cover 2.

[0091] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0092] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0093] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An integrated stack top assembly for a nuclear power plant, characterized in that: include: A shroud assembly, one end of which is mounted on the reactor pressure vessel top cover and the other end of which extends above the refueling pool, wherein the shroud assembly surrounds the outside of the control rod drive mechanism; A cable tray is installed on the refueling pool; A top cover hanger is installed above the shroud assembly and connected to the reactor pressure vessel top cover at one end. The outer wall of the shroud assembly is provided with at least two slide rails along its axial direction. The top of the slide rails at least partially extends and is fixed on the top cover hanger; wherein, The shroud assembly is provided with at least one air inlet on a side close to the reactor pressure vessel top cover, and external cooling air enters the shroud assembly through the air inlet and is discharged at the top of the shroud assembly. At least one cable connection plate is provided on the upper part of the shroud assembly for fixing cable connectors.

2. The integrated top assembly for a nuclear power plant according to claim 1, characterized in that: The shroud assembly comprises a barrel, wherein the barrel has a receiving cavity, wherein the receiving cavity is used to receive the control rod driving mechanism, and at least two slide rails are arranged on the outer wall of the receiving cavity and are spaced apart; The number of the air inlets is at least two, and at least two of the air inlets are arranged at intervals around the circumference of the cylinder, and the air inlets are connected to the accommodating cavity.

3. The integrated stack top assembly for a nuclear power plant according to claim 2, characterized in that: The cylinder body is also provided with at least one inspection window, and the inspection window is communicated with the accommodating cavity.

4. The integrated top assembly for a nuclear power plant according to claim 1, characterized in that: The cable bridge is slidably matched with a guide rail provided on the refueling pool to approach or move away from the shroud assembly.

5. The integrated top assembly for a nuclear power plant according to claim 4, characterized in that: The refueling water pool is provided with a guide rail on each of the opposite sides of the shroud assembly, and the cable tray is slidably matched with the guide rail; wherein, When the reactor is in operation, the cable tray is at least partially moved or flipped to the shroud assembly to achieve the cable connector connection operation; when the reactor is shut down for refueling, the cable connector is disconnected and the cable tray is moved or flipped to a side away from the shroud assembly.

6. The integrated top assembly for a nuclear power plant according to claim 5, characterized in that: The cable connection plate is provided on one side of the shroud assembly above the refueling pool and close to the cable tray. When the reactor is in operation, the cable tray moves to the cable connection plate to connect the cables in the shroud assembly to the cable tray.

7. The integrated top assembly for a nuclear power plant according to claim 6, characterized in that: The cable bridge comprises a frame body and a cable grid arranged on the frame body. The cable grid is arranged on a side of the frame body facing the surrounding tube assembly and is used to support and fix the rear end cable.

8. The integrated top assembly for a nuclear power plant according to claim 1, characterized in that: A cable support and at least one layer of cable tray are provided in the shroud assembly, wherein the cable support is provided above the control rod driving mechanism, and the cable tray is provided above the cable support; The cables on the control rod drive mechanism are connected to the cable connection plate through the cable support and the cable tray, and are connected to the corresponding cables on the cable tray.

9. The integrated top assembly for a nuclear power plant according to claim 8, characterized in that: The number of the cable trays is at least two, and at least two of the cable trays are stacked along the axial direction of the shroud assembly to support cables of different types.

10. The integrated top assembly for a nuclear power plant according to claim 8, characterized in that: The cable support comprises a support and a steel cable, wherein the steel cable is connected to the support and has a grid structure; The cable moves horizontally along the steel cable to the inner wall side of the enclosure assembly and is connected to the cable connection plate upward through the cable tray.

11. The integrated stack top assembly for a nuclear power plant according to claim 10, characterized in that: The steel cables are composed of at least two layers, and the at least two layers of the steel cables are spaced apart along the axial direction of the shroud assembly.

12. A reactor, characterized in that: It comprises an integrated stack top assembly for a nuclear power plant as described in any one of claims 1 to 11.

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