A nuclear power plant pressurizer support system, pressurizer apparatus, and method of installation

Abstract

The present application relates to the technical field of nuclear power, and particularly relates to a nuclear power plant pressurizer supporting system, a pressurizer device and a mounting method, the nuclear power plant pressurizer supporting system comprising an upper supporting assembly and a lower radial limiting assembly, the upper supporting assembly being arranged at the upper part of the pressurizer, bearing the vertical load of the pressurizer and transmitting the load to the upper floor of the plant, the lower radial limiting assembly being arranged at the lower part of the pressurizer, bearing the horizontal load of the pressurizer and transmitting the load to the lower floor of the plant, the upper supporting assembly comprising three or more supporting seats arranged at intervals in the circumferential direction, the upper supporting assembly and the lower radial limiting assembly being independent in structure, so that the vertical load borne by the upper supporting assembly and the horizontal load borne by the lower radial limiting assembly are independently transmitted. The nuclear power plant pressurizer supporting system provided by the present application realizes independent transmission of the vertical load and the horizontal load, and releases the vertical space at the lower part of the pressurizer.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a nuclear power plant pressurizer support system, pressurizer equipment, and installation method. Background Technology

[0002] The pressurizer is one of the key components of the primary loop main system in a pressurized water reactor nuclear power plant. It is fixed to the floor slab of the nuclear island building via pressurizer supports. The pressurizer support is the main load-bearing component for various static and dynamic loads experienced by the pressurizer under normal operation and accident conditions. While allowing free radial movement of the pressurizer due to pressure and thermal expansion, it must maintain the fixed position of the pressurizer's central axis and limit the pressurizer's displacement under accident conditions. In third-generation nuclear power technology, an automatic pressure relief system module is installed at the top of the pressurizer. This module has a large total weight, therefore the pressurizer support also needs to provide support for this module. Existing pressurizer upper supports use a ring beam with multiple tie rods, transferring lateral loads to the surrounding walls through the tie rods; the lower supports use outriggers with diagonal tie rods, transferring vertical loads to the floor slab through the outriggers and lateral loads to the surrounding walls through the diagonal tie rods.

[0003] First, the existing support structure has numerous components with extremely high precision requirements, leading to significant manufacturing and on-site installation difficulties and a long construction period. Second, the lower support legs occupy the space at the lower end cap of the voltage regulator, resulting in extremely limited space for the installation and maintenance of the electric heater, hindering heat dissipation and easily causing excessively high temperatures in the wiring terminals. Third, both the ring beam and the support legs bear vertical and horizontal loads simultaneously, with loads from different directions coupled on the same component, resulting in complex stress distribution and making structural design difficult to optimize; furthermore, the ring beam supports both the voltage regulator body and the automatic pressure relief system module, further increasing structural complexity. Summary of the Invention

[0004] This invention provides a nuclear power plant pressurizer support system, pressurizer equipment, and installation method. The nuclear power plant pressurizer support system realizes the independent transmission of vertical and horizontal loads and releases the vertical space of the lower support.

[0005] The present invention provides a voltage regulator support system, comprising: The upper support assembly is located on the upper part of the voltage regulator, bears the vertical load of the voltage regulator and transmits the load to the upper floor of the plant. The lower radial limiting component is located at the bottom of the voltage regulator, bears the horizontal load of the voltage regulator and transmits the load to the lower floor of the plant. The upper support assembly includes three or more support seats arranged circumferentially. The upper support assembly and the lower radial limiting assembly are structurally independent of each other, so that the vertical load borne by the upper support assembly and the horizontal load borne by the lower radial limiting assembly are transmitted independently.

[0006] In one embodiment of the present invention, each of the support bases includes: Support surface, used to support the corresponding boss on the voltage regulator; A pressure plate presses against the top surface of the boss; A tie rod passes through the pressure plate and the support seat and is anchored to the upper floor slab. A fastener is provided at the upper end of the tie rod, and the pressure plate is pressed against the boss by the fastener. Shear-resistant members are used to embed in the concrete of the upper floor slab.

[0007] In one embodiment of the present invention, the upper support assembly includes three support seats, which are evenly distributed at 120° intervals along the circumference of the voltage regulator. The lower radial limiting assembly includes 4 to 8 radial limiters, each radial limiter being evenly distributed along the circumference of the voltage regulator.

[0008] In one embodiment of the present invention, an adjustment assembly is provided between the support base and the boss. The adjustment assembly includes two side slide plates, two lateral adjustment plates, a horizontal sliding plate, and a horizontal adjustment plate.

[0009] In one embodiment of the present invention, the side slide plates are respectively disposed on both sides of the boss, the support seat is provided with a groove, the lateral adjustment plates are respectively disposed on both sides of the groove of the support seat, and the side slide plates are in sliding contact with the corresponding lateral adjustment plates. The horizontal sliding plate is disposed on the bottom surface of the boss, and the horizontal adjustment plate is disposed on the bottom surface of the groove of the support seat. The horizontal sliding plate and the horizontal adjustment plate are in sliding contact.

[0010] In one embodiment of the present invention, a preset radial expansion gap is provided between the lateral adjustment plate and the side slide plate. The lateral adjustment plate is formed by processing to a preset thickness to form the gap, so as to allow the side slide plate to slide relative to the boss when the boss expands radially.

[0011] In one embodiment of the present invention, a leveling component is provided below the shear-resistant member, the leveling component being used to adjust the elevation of the support seat before secondary pouring.

[0012] In one embodiment of the present invention, a leveling component is provided below the shear member. The leveling component is located in the shear member installation pit formed after the first pour and is located below the shear member. It is used to adjust the elevation of the support seat before the second pour. The leveling component is covered in concrete after the second pour.

[0013] In one embodiment of the present invention, each of the pull rods is further provided with: A sleeve is embedded in the upper floor slab, and the tie rod passes through the sleeve; An anchor plate is provided at the lower end of the tie rod and located below the upper floor slab, for anchoring the tie rod to the upper floor slab; Two spherical washers and two pads are provided, one of which is located at the upper end of the pull rod and between the fastener and the pressure plate, and the other is located at the lower end of the pull rod and between the anchor plate and the fastener used to lock the anchor plate, with each spherical washer adjacent to the corresponding fastener.

[0014] In one embodiment of the present invention, each of the support seats is provided with an upper surface ring and a plurality of reinforcing ribs, and each reinforcing rib extends radially from the shear-resistant member to the upper surface ring; The upper surface ring is arc-shaped, and the upper surface of the support seat is provided with a groove for accommodating the boss, and the support surface is the bottom surface of the groove.

[0015] In one embodiment of the present invention, a secondary grouting layer is provided between the bottom surface of the support base and the upper floor slab.

[0016] In one embodiment of the present invention, the shear-resistant member has a horizontal flange and two vertical portions. The horizontal flange forms the bottom of the support base. The two vertical portions are arranged parallel to each other below the horizontal flange and located in the central region. Each vertical portion has a plate on its side, and the plate has a protrusion or a groove. The plate is fixed to the vertical portion by bolts. The vertical section, the plate, the protrusion or groove, and the bolt are all embedded in the secondary concrete pouring of the upper floor slab.

[0017] In one embodiment of the present invention, all the support seats of the upper support assembly are connected as a whole to form an integral annular support seat.

[0018] In one embodiment of the present invention, each of the radial limiters includes: Multiple pre-embedded anchors are fixed to the lower floor slab in a single pouring process. The connecting plate is square in shape, with a through hole in the middle. Multiple connecting sleeves are vertically arranged on the connecting plate, and each connecting sleeve is respectively fitted onto the corresponding primary pre-embedded anchor. An anchoring base plate is arranged parallel to and spaced apart from the connecting plate, and is fixedly connected to the connecting plate through the connecting sleeve; The connecting plate, the anchoring foundation plate, and the connecting sleeve are fixed to the lower floor slab by secondary casting. A threaded sleeve is vertically mounted on the anchoring base plate; An adjusting stud is threadedly engaged with the threaded sleeve, and the head of the adjusting stud is used to abut against the lower body of the voltage regulator. A lock nut is screwed onto the adjusting stud to lock the position of the adjusting stud.

[0019] The present invention also provides a voltage regulator device, comprising: Voltage regulator body; And a voltage regulator support system as described above, the voltage regulator support system being connected to the voltage regulator body.

[0020] In one embodiment of the present invention, the upper support assembly includes three support seats, and the voltage regulator body is provided with three integral forged bosses. The three integral forged bosses are arranged in one-to-one correspondence with the three support seats, and the integral forged bosses and the voltage regulator body are an integral forged structure without weld seams.

[0021] The present invention also provides a primary loop system for a nuclear power plant, including the nuclear power plant pressurizer equipment as described above; And the reactor pressure vessel, steam generator, main pump and primary loop main piping; The primary loop main pipeline is connected to the reactor pressure vessel, the steam generator, the main pump, and the nuclear power plant pressurizer equipment to form a closed reactor coolant circulation loop.

[0022] In one embodiment of the present invention, the primary loop system of the nuclear power plant further includes an automatic pressure relief system module disposed on the top of the pressurizer equipment of the nuclear power plant, the automatic pressure relief system module being connected to the pressurizer body; the support of the pressurizer body by the pressurizer support system is decoupled from the support of the automatic pressure relief system module.

[0023] The present invention also provides an installation method for a voltage regulator support system, comprising the following steps: When the upper floor slab of the factory building is poured in one go, sleeves are pre-embedded and shear-resistant component installation pits are reserved; when the lower floor slab is poured in one go, pre-embedded anchors are pre-embedded. The support seat is hoisted into place, and the shear-resistant component of the support seat falls into the shear-resistant component installation pit. After the elevation of the support seat is adjusted by the leveling component, a second pour is carried out to fix the support seat. The connecting plate, connecting sleeve, and anchoring base plate are placed on the lower floor slab, and the connecting sleeve is fitted onto the primary embedded anchor. A secondary pour is then performed to fix the connecting plate, the connecting sleeve, and the anchoring base plate. The anchoring base plate is pre-installed with a threaded sleeve, an adjusting stud, and a locking nut. The voltage regulator is hoisted into place so that the upper boss of the voltage regulator sits on the support surface of the support base; The thickness of the horizontal adjustment plate and the lateral adjustment plate are adjusted according to the measured installation error to compensate for the installation error between the boss and the support; and a radial expansion gap is formed between the boss and the sidewall of the groove by adjusting the thickness of the lateral adjustment plate. Install the pressure plate, tie rod, and fasteners to press the pressure plate against the boss; Adjust the adjusting stud according to the thermal expansion calculation results to preset the cold gap between the adjusting stud and the lower body of the voltage regulator.

[0024] In one embodiment of the present invention, the radial expansion gap is calculated and determined based on the radial dimension and thermal expansion coefficient of the voltage regulator.

[0025] The beneficial effects of this invention are as follows: This invention proposes a nuclear power plant pressurizer support system, pressurizer equipment, and installation method. This pressurizer support system structurally independently sets up the upper support assembly and the lower radial limiting assembly, allowing for independent transmission of the vertical load borne by the upper support assembly and the horizontal load borne by the lower radial limiting assembly. This avoids the complex stress state caused by loads from different directions coupling on the same component and simplifies the stress mode of each component. This design places the vertical load-bearing function in the upper part of the pressurizer, eliminating the need for traditional heavy-duty support legs in the lower part of the pressurizer. This frees up physical space in the lower part of the pressurizer, providing ample operating space for the installation, maintenance, and replacement of the lower head electric heater, while also improving the heat dissipation conditions of the electric heater. Furthermore, the upper support assembly uses at least three circumferentially spaced support seats, resulting in a simple and compact structure that reduces manufacturing and installation difficulty and shortens the on-site construction period. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0027] In the attached diagram: Figure 1 A schematic diagram of the structure of a voltage regulator provided in an embodiment of the present invention, which is installed on the upper and lower floors of a nuclear power plant through a nuclear power plant voltage regulator support system; Figure 2 This is a schematic diagram showing the connection between the voltage regulator and the voltage regulator support in related technologies. Figure 3 This is a schematic diagram of a voltage regulator in related technologies and its structure installed on the upper floor slab via an upper support structure. Figure 4This is a schematic diagram of a voltage regulator in related technologies and its structure installed on the lower floor slab via a lower support structure. Figure 5 This is a schematic diagram of the connection between a voltage regulator and a nuclear power plant voltage regulator support system according to an embodiment of the present invention; Figure 5-1 This is a schematic diagram of a voltage regulator body with a boss provided in an embodiment of the present invention; Figure 6 A schematic diagram showing the connection between a voltage stabilizer and the concrete of the upper floor slab via an upper support assembly, according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of the upper floor slab after one-time casting according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the connection between the support base and the concrete slab of the upper floor provided in one embodiment of the present invention; Figure 9 This is a schematic diagram of a support structure provided in one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure in which the upper surface ring of the support base and the boss of the voltage regulator are connected in a fit with each other in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the voltage regulator being installed on the lower floor slab through the lower radial limiting component when it is in a hot state, according to one embodiment of the present invention. Figure 12 This is a schematic diagram of a radial limiter structure provided in one embodiment of the present invention; The attached figures are labeled as follows: Upper support assembly 100, support seat 10, pressure plate 11, upper surface ring 12, support surface 121, reinforcing rib 13, shear member 14, horizontal flange 141, vertical part 142, plate 143, tie rod 15, sleeve 16, anchor plate 17, spherical washer 18, pad 19, lower radial limiting assembly 200, radial limiter 20, primary embedded anchor 21, connecting plate 22, connecting sleeve 23, anchoring base plate 24, adjusting stud 25, locking nut 26, voltage stabilizer 300, voltage stabilizer body 301, boss 30, adjusting assembly 3, side sliding plate 31, lateral adjusting plate 32, horizontal sliding plate 33, horizontal adjusting plate 34, leveling assembly 4, upper floor slab 400, shear member installation pit 40, lower floor slab 500, primary pouring A, secondary pouring B; Before improvement Figures 2 to 4 The attached reference numerals are: ring beam X1, upper support structure X2, upper tie rod X21, lower support structure X3, lower tie rod X31, and support beam X4 of the automatic pressure relief system module. Detailed Implementation

[0028] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0031] Before detailing the technical solution of this application, the technical terms used in this specification will be explained in a unified manner. The pressurizer 300 mentioned in this application refers to a Class I pressure-bearing device in the primary loop main system of a pressurized water reactor nuclear power plant, used to control and regulate the pressure of the primary loop system. The automatic pressure relief system refers to a safety system installed on top of the pressurizer for rapid pressure relief under accident conditions. In-service inspection refers to the periodic non-destructive testing of the pressure-bearing boundaries of nuclear safety equipment in accordance with nuclear safety regulations during the operating life of the nuclear power plant. Primary pouring refers to the initial pouring of the main concrete structure of the plant building during the civil construction phase. Secondary pouring refers to the process of pouring grouting material into reserved pits or gaps after equipment positioning and leveling.

[0032] like Figures 2 to 4 As shown, the pressurizer 300 is one of the key pieces of equipment in a pressurized water reactor nuclear power plant. It is used to regulate and control the pressure and volume of the primary loop main system in the nuclear island, playing a crucial role in ensuring the safe operation of the primary loop main system and the integrity of the pressure boundary. The pressurizer 300 is fixed to the floor slab of the pressurizer 300 compartment by a pressurizer support.

[0033] The voltage regulator support is the main component bearing more than 300 static and dynamic loads, including its own weight, loss-of-coolant loads, and seismic loads. The support structure allows the voltage regulator 300 to move freely radially due to pressure and thermal expansion, while keeping the central axis of the voltage regulator 300 fixed and limiting its displacement under emergency conditions, thereby maintaining the stability of the voltage regulator 300.

[0034] In third-generation nuclear power technology, the safety valve at the top of the pressurizer 300, along with fourteen other large valves and connecting pipes, forms an automatic pressure relief system module, which weighs approximately 50 tons. The pressurizer support, in addition to supporting the pressurizer body 301, also needs to support the automatic pressure relief system module. In existing technology, the upper support structure X2 of the pressurizer 300 uses a ring beam X1 plus upper tie rods X21, with lateral loads transferred to the concrete walls surrounding the pressurizer 300 compartment via eight upper tie rods X21. The lower support structure X3 of the pressurizer 300 uses outriggers plus lower tie rods X31, with vertical loads transferred to the lower floor slab 500 via four outriggers, and lateral loads transferred to the surrounding concrete walls via the lower tie rods X31. The upper support structure X2 of the voltage regulator 300 has a ring beam X1 on which a support beam X4 for the automatic pressure relief system module is installed. This beam is connected to the inclined beam of the automatic pressure relief system module, thereby realizing the support function of the voltage regulator support for the automatic pressure relief system module.

[0035] The aforementioned pressurizer support structure is complex, negatively impacting both manufacturing and on-site installation. In the pressurizer support design of this nuclear power plant, the vertical load-bearing support is typically located near the lower end cap of the pressurizer 300, with multi-directional constraints implemented at both the upper and lower levels via upper tie rod X21 and lower tie rod X31. This structure has several shortcomings: First, the structure is complex, making manufacturing and installation difficult. The structure has numerous components, and the precision requirements for the fit and tolerances between these components are high, resulting in significant processing challenges for the manufacturer. Furthermore, the structure demands high precision in on-site pre-embedding, and the installation process is complex, requiring numerous on-site adjustments, thus increasing the difficulty of on-site construction.

[0036] Second, there is the coupling of mechanical transmission paths. Since both vertical load-bearing and horizontal restraint are concentrated in the lower part, the lower supporting structure is large in volume, and the coupled mechanical paths under seismic conditions will generate complex alternating stresses, making structural design difficult to optimize.

[0037] Third, the lower physical space is limited. The electric heater of the voltage regulator 300 is located in the lower head area, and the load-bearing legs are close to the electric heater, resulting in a small space in the lower head area. This is not conducive to the installation, maintenance and replacement of the electric heater, nor is it conducive to the heat dissipation of the electric heater, and there is a risk of excessively high temperature of the wiring cable.

[0038] To address the technical problems of load coupling, structural complexity, and limited space in existing voltage regulator support structures, this application provides a voltage regulator support system that simplifies the force distribution mode of the support system by structurally separating the transmission paths of vertical and horizontal loads, while freeing up space under the voltage regulator 300.

[0039] like Figure 1 As shown, the nuclear power plant pressurizer support system provided by the present invention includes an upper support assembly 100 and a lower radial limiting assembly 200. The upper support assembly 100 is disposed on the upper part of the pressurizer 300 and is used to bear the vertical load generated by the pressurizer 300 during operation, including the weight of the pressurizer 300 itself, the weight of the internal medium, and the weight of the top automatic pressure relief system module, and to transfer these vertical loads to the upper floor slab 400 of the nuclear power plant building. To achieve the above function, the upper support assembly 100 includes three support seats 10, which are arranged circumferentially at intervals along the pressurizer 300. The three support seats 10 are evenly distributed around the upper cylindrical section of the pressurizer 300 at an included angle of 120°, forming a stable three-point support structure, which can evenly distribute the vertical load of the pressurizer 300 onto the three support seats 10. Depending on the actual load requirements, four or more support seats 10 may also be provided, which is not limited in this embodiment.

[0040] A lower radial restraint assembly 200 is provided in the lower region of the pressurizer 300. This assembly is arranged on the outer periphery of the lower cylinder of the pressurizer 300 to withstand horizontal loads, such as seismic loads or horizontal impact forces generated in the event of a pipe rupture accident, and to transfer these horizontal loads to the lower floor slab 500 of the nuclear power plant building. The lower radial restraint assembly 200 includes multiple radial restraints 20, which are arranged at intervals along the circumference of the pressurizer 300, forming horizontal constraints on the lower part of the pressurizer 300 from different directions. In one specific embodiment, the lower radial restraint assembly 200 includes four radial restraints 20, which are evenly distributed along the circumference of the pressurizer 300 and arranged symmetrically in a cross shape in the horizontal plane. Depending on the actual load requirements, the number of radial restraints 20 can be four to eight, and this embodiment does not limit this.

[0041] The upper support assembly 100 and the lower radial limiting assembly 200 are structurally independent, with no direct mechanical connection between them. In this independent configuration, the vertical load borne by the upper support assembly 100 is transmitted to the upper floor slab 400 solely through its own structure, without passing through the lower radial limiting assembly 200. Similarly, the horizontal load borne by the lower radial limiting assembly 200 is transmitted to the lower floor slab 500 solely through its own structure, without passing through the upper support assembly 100.

[0042] like Figures 5 to 6 As shown, in one specific implementation, the three support seats 10 of the upper support assembly 100 correspond to three bosses 30 provided on the outer wall of the cylinder of the voltage regulator 300. A support surface 121 is formed on the support seat 10, and the bosses 30 sit on this support surface 121, allowing the voltage regulator 300 to transfer vertical loads to the support seat 10 through the bosses 30. Downward vertical loads are transferred to the upper floor slab 400 through the bottom surface of the support seat 10, and upward vertical loads are transferred to the upper floor slab 400 through a tie rod 15 penetrating the upper floor slab 400. Each radial limiter 20 of the lower radial limiting assembly 200 includes an anchoring base and an adjusting stud 25. The anchoring base is fixed to the lower floor slab 500, and the adjusting stud 25 abuts against the outer wall of the lower cylinder of the voltage regulator 300 in the horizontal direction. The anchoring foundation can be composed of a pre-embedded anchor 21 and a secondary cast anchoring foundation plate 24. The specific form of the anchoring foundation is not limited in the embodiments of this application.

[0043] The aforementioned structure separates the transmission paths of vertical and horizontal loads, with each load borne and transmitted to different floor structures by independent support components. This separation of load paths avoids the combined stress state resulting from the coupling of vertical and horizontal loads on the same component, simplifies the stress patterns of each component, and reduces the complexity of structural design. Simultaneously, since no load-bearing legs are installed at the bottom, the physical space around the lower end cap of the voltage regulator 300 is freed up, providing a spacious operating environment for the installation, inspection, and maintenance of the electric heater. Furthermore, the upper support component 100 sets the vertical constraint point of the voltage regulator 300 at its upper part, ensuring that the axial expansion of the voltage regulator 300 under thermal conditions primarily occurs downwards, with the upward expansion displacement at the top controlled within a small range, thereby reducing the additional load at the interface of the top automatic pressure relief system module.

[0044] like Figures 5 to 9As shown, in an optional embodiment of this case, each support 10 includes a support surface 121, a pressure plate 11, a tie rod 15, and a shear-resistant member 14. The support surface 121 is disposed on the upper part of the support 10 and is used to support the corresponding boss 30 disposed on the voltage stabilizer 300. The support surface 121 is a horizontal plane, and its area is larger than the area of ​​the bottom surface of the boss 30, so that the bottom surface of the boss 30 and the support surface 121 form a surface contact, and the vertical load is evenly transferred to the support 10. The pressure plate 11 is disposed above the support surface 121 and presses against the top surface of the boss 30. The lower surface of the pressure plate 11 is in contact with the top surface of the boss 30. The tie rod 15 is disposed vertically, passing through the pressure plate 11 and the support 10. The lower end of the tie rod 15 is anchored to the upper floor slab 400, and the upper end of the tie rod 15 is provided with a fastener. The fastener is threaded onto the tie rod 15. By tightening the fastener, the pressure plate 11 presses the boss 30 downward, thereby fixing the boss 30 between the support base 10 and the pressure plate 11. The shear member 14 is located at the bottom of the support base 10, extending downward and embedding into the concrete of the upper floor slab 400. The lower end of the shear member 14 is embedded in the concrete of the upper floor slab 400, used to transfer horizontal loads to the concrete structure of the upper floor slab 400. The shear member 14 adopts a T-shaped structure, with its horizontal flange 141 located at the upper part and its vertical part 142 located at the lower part. The vertical part 142 is embedded in the concrete, and the horizontal flange 141 is located on the upper surface of the secondary concrete pour B. Through this structure, the tie rod 15 presses the boss 30 onto the support base 10, and the shear member 14 transfers the horizontal load to the concrete structure, achieving vertical fixation and horizontal limiting of the voltage stabilizer 300.

[0045] like Figures 5 to 7As shown, in an optional embodiment of this case, the upper support assembly 100 includes three support seats 10, which are evenly distributed at 120° intervals along the circumference of the voltage stabilizer 300. The three support seats 10 have the same structure and dimensions and are respectively disposed on the outer periphery of the upper cylindrical section of the voltage stabilizer 300. The uniform 120° interval ensures that the three support seats 10 are equidistantly distributed in the circumferential direction, forming a symmetrical three-point support structure, which can coordinate uneven stress caused by manufacturing tolerances or foundation settlement. The lower radial limiting assembly 200 includes four to eight radial limiters 20, each radial limiter 20 being evenly distributed along the circumference of the voltage stabilizer 300. The number of radial limiters 20 can be four, five, six, seven, or eight, and each radial limiter 20 is equidistantly distributed in the circumferential direction. When the number of radial limiters 20 is four, the included angle between adjacent radial limiters 20 is 90°; when the number is eight, the included angle between adjacent radial limiters is 45°. For other quantities between four and eight, each radial limiter 20 is also evenly distributed circumferentially, with the corresponding included angle determined according to the quantity. Through the above quantity and arrangement, the three support seats 10 form symmetrical vertical supports for the voltage regulator 300 in the circumferential direction, and the multiple radial limiters 20 form symmetrical horizontal constraints on the lower part of the voltage regulator 300 in the circumferential direction.

[0046] like Figures 8 to 10As shown, in an optional embodiment of this case, an adjustment assembly 3 is provided between the support base 10 and the boss 30. The adjustment assembly 3 includes two side slide plates 31, two lateral adjustment plates 32, a horizontal sliding plate 33, and a horizontal adjustment plate 34. The side slide plates 31 are respectively disposed on both sides of the boss 30. The upper part of the support base 10 is provided with a groove to support the boss 30. The lateral adjustment plates 32 are respectively disposed on the two side walls of the groove of the support base 10. The lateral adjustment plates 32 are respectively disposed on the two side walls of the support base 10 and are fixedly connected to the side walls of the support base 10. The side slide plates 31 slide in contact with the corresponding lateral adjustment plates 32, and the surfaces of the side slide plates 31 and the surfaces of the lateral adjustment plates 32 are in contact, forming a sliding friction pair between them. The horizontal sliding plate 33 is disposed on the bottom surface of the boss 30 and is fixedly connected to the bottom surface of the boss 30. The horizontal adjustment plate 34 is disposed on the bottom surface of the groove of the support base 10 and is fixedly connected to the top surface of the support base 10. The horizontal sliding plate 33 and the horizontal adjusting plate 34 are in sliding contact, with the lower surface of the horizontal sliding plate 33 abutting against the upper surface of the horizontal adjusting plate 34, forming a sliding friction pair. The side sliding plate 31 and the horizontal sliding plate 33 are made of low-friction material to reduce the coefficient of friction of the sliding contact surfaces. With the above structure, during installation, the cumulative errors caused by civil construction and equipment manufacturing can be eliminated by adjusting the thickness of the side adjusting plate 32 and the horizontal adjusting plate 34; during hot operation, when the boss 30 thermally expands in the horizontal direction, the side sliding plate 31 slides on the surface of the side adjusting plate 32, and the horizontal sliding plate 33 slides on the surface of the horizontal adjusting plate 34, thereby releasing the displacement caused by thermal expansion.

[0047] like Figure 7 As shown, in an optional embodiment of this case, a preset radial expansion gap is provided between the lateral adjustment plate 32 and the side slide plate 31. This radial expansion gap is formed by machining the lateral adjustment plate 32 to a preset thickness. During cold installation, the gap between the lateral adjustment plate 32 and the side slide plate 31 remains at a preset value, which is calculated and determined based on the material linear expansion coefficient of the regulator 300 cylinder and the temperature difference between the cold and hot states. When the regulator 300 heats up from a cold state to a hot state, the regulator 300 cylinder undergoes radial thermal expansion, the boss 30 moves radially outward with the cylinder, and the side slide plate 31 moves outward with the boss 30, gradually reducing the gap between the lateral adjustment plate 32 and the side slide plate 31. When the regulator 300 reaches its rated operating temperature, the side slide plate 31 and the lateral adjustment plate 32 come into contact, and the gap is essentially eliminated. At this time, a contact state is formed between the side slide plate 31 and the lateral adjustment plate 32, providing radial restraint for the boss 30. By pre-setting a radial expansion gap in the cold state, the voltage regulator 300 can expand outward smoothly during the heating process, avoiding additional thermal stress caused by obstructed thermal expansion; after reaching the rated operating temperature, the gap is basically eliminated, providing radial rigidity limit and restricting horizontal displacement under accident conditions.

[0048] like Figure 7 As shown, as an optional embodiment of this application, to address the difficulty in adjusting the elevation during the installation of the support base 10, this application provides a specific implementation of the leveling component 4. The leveling component 4 is located below the shear member 14. The leveling component 4 is positioned in the shear member installation pit 40 formed after the first pour A, below the shear member 14, and is used to adjust the elevation of the support base 10 before the second pour B. The leveling component 4 is then encased in concrete after the second pour B. The leveling component 4 can be an adjusting bolt or a wedge-shaped shim. By adjusting the height of the leveling component 4, the support surface 121 of the support base 10 reaches the design elevation. After the elevation adjustment is completed, grout is injected into the shear member installation pit 40 for the second pour B. The grout from the second pour B fills the gaps in the shear member installation pit 40, encasing and covering the leveling component 4 in the concrete. After being covered, the leveling component 4 no longer functions as a moving part, and the support base 10 transfers the load to the floor structure through the grout layer and the shear member 14. The leveling component 4 is used to adjust the elevation of the support 10 before the secondary pouring B, so as to eliminate the elevation deviation caused by the primary pouring A.

[0049] like Figure 6 and Figure 8As shown, as an optional embodiment of this application, to address the problem of complex stress state and susceptibility to eccentric loads of the tie rod 15, this application provides a specific implementation of the tie rod 15 anchoring and self-aligning structure. Each tie rod 15 is also provided with a sleeve 16, an anchoring plate 17, two spherical washers 18, and two pads 19. The sleeve 16 is pre-embedded in the upper floor slab 400, and the tie rod 15 passes through the sleeve 16. The sleeve 16 is a cylindrical structure, pre-embedded vertically in the concrete of the upper floor slab 400. The inner diameter of the sleeve 16 is larger than the outer diameter of the tie rod 15, providing a through passage and space for slight swing of the tie rod 15. The anchoring plate 17 is located at the lower end of the tie rod 15, below the upper floor slab 400, and is used to anchor the tie rod 15 to the upper floor slab 400. The anchoring plate 17 is a plate-shaped component with an area larger than the cross-sectional area of ​​the tie rod 15, and is fixedly connected to the lower end of the tie rod 15. Of the two spherical washers 18 and two pads 19, one spherical washer 18 and one pad 19 are located at the upper end of the tie rod 15, between the fastener and the pressure plate 11; the other spherical washer 18 and the other pad 19 are located at the lower end of the tie rod 15, between the anchor plate 17 and the fastener used to lock the anchor plate 17. Each spherical washer 18 is adjacent to its corresponding fastener. The spherical surface of the spherical washer 18 and the spherical surface of the pad 19 are adapted to each other, forming a spherical kinematic pair. The spherical washer 18 may have a convex spherical surface and the pad 19 may have a concave spherical surface, or the spherical washer 18 may have a concave spherical surface and the pad 19 may have a convex spherical surface. When the tie rod 15 is subjected to a load and undergoes a slight angular deflection, the spherical washer 18 slides relative to the spherical surface of the pad 19, automatically adjusting the clamping direction of the fastener, so that the tie rod 15 remains under axial force. Through the above structure, the sleeve 16 provides a through channel and swing space for the tie rod 15, the anchor plate 17 distributes the tension of the tie rod 15 to the floor slab, and the cooperation between the spherical washer 18 and the pad 19 reduces the eccentric bending moment.

[0050] like Figure 6 and Figure 8As shown, as an optional embodiment of this application, to address the problem of insufficient structural rigidity and load-bearing capacity of the support seat 10, this application provides a specific implementation of a reinforced structure for the support seat 10. Each support seat 10 is provided with an upper surface ring 12 and multiple reinforcing ribs 13, each reinforcing rib 13 extending radially from the shear-resistant member 14 to the upper surface ring 12. The upper surface ring 12 is arc-shaped, and the upper surface of the support seat 10 is provided with a groove for accommodating the boss 30, with the support surface 121 being the bottom surface of the groove. The upper surface ring 12 is an arc-shaped plate structure, the curvature of which matches the outer circle of the voltage stabilizer 300 cylinder, so that a uniform gap is maintained between the upper surface of the support seat 10 and the outer wall of the cylinder. The groove is provided on the upper surface ring 12, recessed downwards, with the bottom surface of the groove being a horizontal plane, serving as the support surface 121 for bearing the boss 30. Multiple reinforcing ribs 13 are spaced apart along the circumference of the support seat 10, each reinforcing rib 13 extending radially from the shear-resistant member 14 to the upper surface ring 12. The upper end of the reinforcing rib 13 is fixedly connected to the bottom surface of the upper surface ring 12, and the lower end of the reinforcing rib 13 is fixedly connected to the shear-resistant member 14. Through the above structure, the arc-shaped structure of the upper surface ring 12 maintains a gap between the support seat 10 and the outer wall of the cylinder, the groove provides positioning and bearing space for the boss 30, and the radially distributed reinforcing ribs 13 transfer the load borne by the upper surface ring 12 to the shear-resistant member 14, thereby improving the overall rigidity and bearing capacity of the support seat 10.

[0051] like Figure 6 As shown, as an optional embodiment of this application, this application provides a specific implementation method for the grouting layer to address the issues of contact and load transfer between the bottom surface of the support 10 and the floor slab. A secondary-cast grouting layer (B) is provided between the bottom surface of the support 10 and the upper floor slab 400. The grouting layer, formed by the secondary-cast grouting B, is located between the bottom surface of the support 10 and the upper surface of the upper floor slab 400. During construction, the support 10 is first positioned and adjusted to the design elevation. Then, grout is injected into the gap between the bottom surface of the support 10 and the floor slab. After the grout solidifies, a grouting layer is formed, filling all the gaps between the bottom surface of the support 10 and the upper surface of the floor slab. The grouting layer transforms the point contact between the bottom surface of the support 10 and the upper surface of the floor slab into a surface contact, allowing the vertical load borne by the support 10 to be evenly transferred to the upper floor slab 400. The grouting layer fills the gaps between the bottom surface of the support 10 and the upper surface of the floor slab, avoiding localized stress concentration and making the load transfer more uniform.

[0052] like Figure 6 and Figure 8As shown, as an optional embodiment of this application, this application provides a specific implementation of the shear member 14 to address the issue of the connection strength between the shear member 14 and the concrete. The shear member 14 has a horizontal flange 141 and two vertical portions 142. The horizontal flange 141 forms the bottom of the support 10. The two vertical portions 142 are arranged parallel to each other below the horizontal flange 141 and located in the middle region of the bottom of the horizontal flange 141. Each vertical portion 142 has a plate 143 on its side, and the plate 143 has a protrusion or a groove. The plate 143 is fixed to the vertical portion 142 by bolts. The vertical portions 142, the plate 143, the protrusion or groove, and the bolts are all embedded in the secondary pouring B concrete of the upper floor slab 400. The horizontal flange 141 is a plate-like structure that extends horizontally. The two vertical portions 142 are column-like or plate-like structures. The two vertical portions 142 are parallel to each other and are respectively arranged in the middle region of the horizontal flange 141. Each vertical section 142 has a plate 143 on its side, extending along the side of the vertical section 142. The plate 143 has protrusions or grooves to increase the contact area and mechanical interlocking force between the plate 143 and the concrete. The plate 143 is fixedly connected to the vertical section 142 by bolts, which pass through the plate 143 and screw into the vertical section 142. During the secondary pour B, the vertical section 142, plate 143, protrusions or grooves, and bolts are encased in concrete, forming a fixed structure after solidification. When the shear member 14 bears a horizontal load, the vertical section 142 transfers the horizontal load to the surrounding concrete through the plate 143 and the protrusions or grooves on the plate 143, utilizing the shear resistance of the concrete to provide restraint.

[0053] As an optional embodiment of this application, to address potential installation alignment issues when the upper support assembly 100 uses independent support seats 10, this application provides an alternative solution using an integral annular support seat. All support seats 10 of the upper support assembly 100 are connected as a single unit to form an integral annular support seat. The integral annular support seat is an annular component, fitted around the outer periphery of the upper cylinder of the voltage stabilizer 300, with a gap between its inner ring and the outer wall of the voltage stabilizer 300 cylinder. The integral annular support seat is anchored to the upper floor slab 400, and its top surface is a horizontal bearing surface used to support the boss 30 of the voltage stabilizer 300. When the outer wall of the voltage stabilizer 300 cylinder has a boss 30, the boss 30 sits on the top surface of the integral annular support seat.

[0054] like Figure 11 and Figure 12As shown, as an optional embodiment of this application, addressing the issue of high anchoring accuracy requirements during the installation of the lower radial limiter 20, this application provides a specific implementation of the radial limiter 20. Each radial limiter 20 includes multiple primary embedded anchors 21, a connecting plate 22, multiple connecting sleeves 23, an anchoring base plate 24, threaded sleeves, adjusting studs 25, and locking nuts 26. The multiple primary embedded anchors 21 are fixed to the lower floor slab 500 by a single pouring A. The lower end of the primary embedded anchor 21 is embedded in the concrete of the lower floor slab 500, and the upper end extends out of the upper surface of the lower floor slab 500. For example, there are four primary embedded anchors 21, respectively located in the lower floor slab 500 at positions corresponding to the four corners of the connecting plate 22. The connecting plate 22 is square, with a through hole in its center. Multiple connecting sleeves 23 are vertically arranged on the connecting plate 22, and each connecting sleeve 23 is respectively fitted onto the corresponding primary embedded anchor 21. The lower end of the connecting sleeve 23 is fixedly connected to the upper surface of the connecting plate 22, and the upper end of the connecting sleeve 23 is fixedly connected to the lower surface of the anchoring base plate 24. The anchoring base plate 24 is arranged parallel to and spaced apart from the connecting plate 22, and is fixedly connected to the connecting plate 22 through the connecting sleeve 23. The connecting plate 22, the anchoring base plate 24, and the connecting sleeve 23 are fixed to the lower floor slab 500 by secondary pouring B. The concrete of secondary pouring B encapsulates the connecting plate 22, the anchoring base plate 24, and the connecting sleeve 23, and forms an integral anchoring foundation after curing. The threaded sleeve is vertically set on the anchoring base plate 24. The adjusting stud 25 is threadedly engaged with the threaded sleeve, and the head of the adjusting stud 25 is used to abut against the lower body of the voltage stabilizer 300. The locking nut 26 is screwed onto the adjusting stud 25 to lock the position of the adjusting stud 25. When the adjusting stud 25 is rotated, the adjusting stud 25 moves axially along the threaded sleeve, and its head extends or retracts. After the gap adjustment is completed, tighten the locking nut 26 to lock the relative position of the adjusting stud 25 and the threaded sleeve.

[0055] As an optional embodiment of this application, addressing the reliability issue of the connection between the voltage regulator body 301 and the support system, this application provides a specific implementation of the voltage regulator device. The voltage regulator device includes a voltage regulator body 301 and a voltage regulator support system as described above, which is connected to the voltage regulator body 301. The voltage regulator body 301 is vertically arranged, with a boss 30 on its upper part that cooperates with the upper support assembly 100 of the voltage regulator support system. The lower cylindrical outer wall of the voltage regulator body 301 is opposite to the lower radial limiting assembly 200 of the voltage regulator support system, and the head of the adjusting stud 25 of the radial limiting assembly abuts against the outer wall of the lower cylindrical body of the voltage regulator 300. The upper support assembly 100 of the voltage regulator support system bears the vertical load of the voltage regulator body 301, and the lower radial limiting assembly 200 bears the horizontal load of the voltage regulator body 301.

[0056] like Figure 6As shown, as an optional embodiment of this application, to address the potential in-service inspection issues related to the weld between the boss 30 and the body of the voltage regulator 300, this application provides a specific implementation of an integrated forged structure for the boss 30. The upper support assembly 100 includes three support seats 10, and the voltage regulator body 301 is provided with three integral forged bosses. The three integral forged bosses are correspondingly arranged with the three support seats 10, and the integral forged bosses 30 and the voltage regulator body 301 are an integral forged structure without welds. The three integral forged bosses are arranged circumferentially around the voltage regulator body 301, and the position of each integral forged boss 30 corresponds to the position of each support seat 10. The integral forged bosses 30 and the voltage regulator body 301 are manufactured using an integral forging process, and there is no welding connection between them. The integral forged bosses 30 protrude outward from the outer wall of the voltage regulator body 301, and their lower surface is a horizontal bearing surface for sitting on the support surface 121 of the support seat 10. There is no weld between the integral forged boss 30 and the voltage regulator body 301, which avoids welding residual stress and welding defects, and also avoids the need for in-service inspection of the weld area during operation.

[0057] This application provides a specific implementation of the primary loop system. The nuclear power plant's primary loop system includes a pressurizer, a reactor pressure vessel, a steam generator, a main pump, and primary loop main piping. The primary loop main piping connects the reactor pressure vessel, steam generator, main pump, and pressurizer to form a closed reactor coolant circulation loop. The reactor pressure vessel houses the reactor core, the steam generator transfers heat from the primary loop coolant to the secondary loop feedwater to generate steam, and the main pump drives the coolant to circulate within the primary loop system. The primary loop main piping sequentially connects the reactor pressure vessel, steam generator, main pump, and pressurizer to form a closed loop. The pressurizer is connected to other system equipment via the primary loop main piping and is used to control and regulate the operating pressure of the primary loop system. During primary loop operation, the coolant, driven by the main pump, flows through the reactor pressure vessel to absorb heat, enters the steam generator via the primary loop main piping to transfer heat to the secondary loop, and then returns to the main pump via the primary loop main piping, forming a cycle. The pressurizer equipment in the nuclear power plant is fixed to the upper floor 400 of the nuclear power plant building via its upper pressurizer support system. Through this structure, the pressurizer equipment is integrated with other equipment in the primary loop to form a complete reactor coolant circulation loop, realizing the pressure control and coolant circulation functions of the primary loop system.

[0058] As an optional embodiment of this application, to address the coupling problem between the support of the automatic pressure relief system module at the top of the pressurizer and the support of the pressurizer body 301, this application provides a further implementation of the primary loop system. The nuclear power plant primary loop system also includes an automatic pressure relief system module located at the top of the pressurizer equipment, connected to the pressurizer body 301. The support system for the pressurizer body 301 is decoupled from the support of the automatic pressure relief system module. The automatic pressure relief system module is installed at the top of the pressurizer body 301 and connected to a connecting pipe inside the pressurizer body 301. The upper support assembly 100 of the pressurizer support system forms a vertical constraint on the pressurizer body 301, with the constraint point located at the upper part of the pressurizer body 301. When the pressurizer body 301 expands axially due to heat, because the vertical constraint point is located at the upper part of the pressurizer body 301, the thermal expansion mainly occurs downwards, and the upward displacement at the connection point of the top automatic pressure relief system module is controlled within a small range. The impact of the thermal expansion displacement of the voltage regulator body 301 on the automatic pressure relief system module is controlled within a small range, and the two are decoupled in the mechanical path.

[0059] The present invention also provides an installation method for a voltage regulator support system, comprising the following steps: During the initial pouring of the upper floor slab 400 (A) of the nuclear power plant building, a sleeve 16 is pre-embedded and a shear-resistant component installation pit 40 is reserved. Simultaneously, during the initial pouring of the lower floor slab 500 (A), a pre-embedded anchor 21 is pre-embedded. The sleeve 16 is pre-embedded in the concrete of the upper floor slab 400, providing a passage for the tie rod 15. The shape of the shear-resistant component installation pit 40 is adapted to the shear-resistant component 14, and its position corresponds to the designed installation position of the support seat 10. The pre-embedded anchor 21 is embedded in the concrete of the lower floor slab 500, with its lower end anchored inside the concrete and its upper end extending out of the upper surface of the lower floor slab 500, providing an anchoring foundation for the installation of the lower radial limiter 20. The initial pouring of A integrates the sleeve 16, the anchor 21, and the building's civil structure, providing a pre-set positioning foundation for subsequent equipment installation.

[0060] The support base 10 is hoisted into place, allowing the shear member 14 of the support base 10 to fall into the shear member installation pit 40. The gap between the shear member 14 and the installation pit provides adjustment margin for the precise positioning of the support base 10. The elevation of the support base 10 is adjusted using the leveling assembly 4, ensuring that the support surface 121 of the support base 10 reaches the design elevation. The leveling assembly 4 can use adjusting bolts or wedge shims; by tightening or loosening the adjusting bolts or increasing or decreasing the number of wedge shims, the elevation and levelness of the support base 10 are precisely adjusted. After the elevation adjustment is completed, secondary pouring B is performed to fix the support base 10. The grout in secondary pouring B fills the gap between the shear member 14 and the installation pit, and after curing, it integrates the shear member 14 with the upper floor slab 400. This step separates the large tolerances of civil construction from the high precision requirements of equipment installation. Through a phased construction method of initial coarse positioning and secondary fine adjustment, the difficulty of civil construction is reduced, and the accuracy of equipment installation is guaranteed.

[0061] The connecting plate 22, connecting sleeve 23, and anchoring base plate 24 are placed on the lower floor slab 500, with the connecting sleeve 23 fitted onto the pre-embedded anchor 21. One end of the connecting sleeve 23 is fixedly connected to the connecting plate 22, and the other end is fixedly connected to the anchoring base plate 24. The anchoring base plate 24 is set parallel and spaced apart from the connecting plate 22. A secondary pour B is performed to fix the connecting plate 22, connecting sleeve 23, and anchoring base plate 24. The concrete of the secondary pour B encapsulates the lower part of the connecting plate 22, connecting sleeve 23, and anchoring base plate 24, and after curing, the three are integrated with the lower floor slab 500. Threaded sleeves, adjusting studs 25, and locking nuts 26 are pre-installed on the anchoring base plate 24. The connecting plate 22, connecting sleeve 23, and anchoring base plate 24 are positioned and fixed in one step during the secondary pour B, forming an integral anchoring foundation, avoiding the cumulative errors caused by the separate positioning of each component.

[0062] The voltage regulator 300 is hoisted into position so that the boss 30 on the upper part of the voltage regulator 300 sits on the support surface 121 of the support base 10. After the voltage regulator 300 is in position, the bottom surface of the boss 30 is in contact with the top surface of the support base 10, forming a vertical load-bearing contact surface. All the vertical load of the voltage regulator 300 is transferred to the support base 10 through the boss 30. This step establishes the vertical load transfer path between the voltage regulator 300 and the support system.

[0063] The thickness of the horizontal adjustment plate 34 and the lateral adjustment plate 32 are determined based on the measured installation errors. After the voltage regulator 300 is in place, the actual gap between the bottom surface of the boss 30 and the top surface of the support 10, and the actual gap between the side surface of the boss 30 and the side wall of the groove are measured using precision measuring tools. The measured values ​​are compared with the design values ​​to calculate the horizontal and lateral installation errors. The thickness of the horizontal adjustment plate 34 is determined based on the horizontal installation error, and the thickness of the lateral adjustment plate 32 is determined based on the lateral installation error. The horizontal adjustment plate 34 is installed between the bottom surface of the boss 30 and the top surface of the support 10 to compensate for the vertical installation error; the lateral adjustment plate 32 is installed between the side surface of the boss 30 and the side wall of the groove to compensate for the horizontal installation error, ensuring that the positioning elevation and center axis position of the voltage regulator 300 meet the design requirements. By adjusting the thickness of the lateral adjustment plate 32, a radial expansion gap is formed between the boss 30 and the side wall of the groove to reserve space for thermal expansion in the cold state. The width of the gap is calculated and determined based on the radial dimension and thermal expansion coefficient of the 300-cell pressurizer. This step eliminates the accumulated tolerances generated in various stages of civil construction, equipment manufacturing, and installation by machining an adjustment plate. The operation is simple, the precision is controllable, and the risks of on-site machining on nuclear-grade equipment are avoided.

[0064] Install the pressure plate 11, tie rod 15, and fasteners to press the pressure plate 11 against the boss 30. The pressure plate 11 is placed above the boss 30, with its lower surface abutting against the top surface of the boss 30. The tie rod 15 passes through the pressure plate 11 and the support base 10 from above, and its lower end is anchored to the upper floor slab 400. Fasteners are installed on the upper end of the tie rod 15. Tightening the fasteners generates an upward pulling force on the tie rod 15, pulling the pressure plate 11 downward and pressing it against the boss 30. The boss 30 is fixed between the support base 10 and the pressure plate 11, locking the vertical position of the voltage stabilizer 300 while providing a transmission path for upward seismic loads.

[0065] Adjust the adjusting stud 25 according to the thermal expansion calculation results to preset the cold-state gap between the adjusting stud 25 and the lower body of the voltage regulator 300. Rotate the adjusting stud 25 to move it axially along the threaded sleeve, causing the head of the adjusting stud 25 to extend or retract. The extension amount of the adjusting stud 25 is determined according to the thermal expansion calculation results, ensuring that the head of the adjusting stud 25 and the lower body of the voltage regulator 300 maintain the preset gap in the cold state. This preset gap is used to absorb the axial thermal expansion of the voltage regulator 300 during hot operation, ensuring that the head of the adjusting stud 25 is basically in contact with the lower body of the voltage regulator 300 during hot operation, forming a rigid constraint on the horizontal load. This step, by presetting the gap during cold installation, avoids the need for personnel to enter the high-radiation area for adjustment after hot operation. After completing the above steps, the voltage regulator support system is installed.

[0066] The preset value of the cold gap is calculated using the linear expansion coefficient of the voltage regulator 300 material, the vertical distance from the contact point of the boss 30 to the radial limiter 20, and the temperature change from cold to hot.

[0067] As an optional embodiment of this application, this application provides a specific implementation method for determining the radial expansion gap, addressing the problem of accurate calculation of the radial expansion gap. The radial expansion gap is calculated and determined based on the radial dimension and linear expansion coefficient of the voltage regulator 300. The radial dimension of the voltage regulator 300 is the outer diameter or radius of the cylinder of the voltage regulator 300 at the horizontal plane where the boss 30 is located. The machining thickness of the lateral adjustment plate 32 is determined based on the calculation results, so that the radial expansion gap is maintained between the boss 30 and the sidewall of the groove in the cold state, and the gap is basically eliminated after the boss 30 expands radially outward in the hot state. The size of the radial expansion gap matches the actual thermal expansion of the voltage regulator 300, so that the voltage regulator 300 is not radially constrained during hot operation.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A pressurizer support system for a nuclear power plant, characterized in that, include: The upper support assembly is located on the upper part of the voltage regulator, bears the vertical load of the voltage regulator and transmits the load to the upper floor of the plant. The lower radial limiting component is located at the bottom of the voltage regulator, bears the horizontal load of the voltage regulator and transmits the load to the lower floor of the plant. The upper support assembly includes three or more support seats arranged circumferentially. The upper support assembly and the lower radial limiting assembly are structurally independent of each other, so that the vertical load borne by the upper support assembly and the horizontal load borne by the lower radial limiting assembly are transmitted independently.

2. The nuclear power plant pressurizer support system according to claim 1, characterized in that, Each of the aforementioned support bases includes: Support surface, used to support the corresponding boss on the voltage regulator; A pressure plate presses against the top surface of the boss; A tie rod passes through the pressure plate and the support seat and is anchored to the upper floor slab. The tie rod uses fasteners to press the pressure plate against the boss. Shear-resistant members are used to embed in the concrete of the upper floor slab.

3. The nuclear power plant pressurizer support system according to claim 1, characterized in that, The upper support assembly includes three support seats, which are evenly distributed at 120° intervals along the circumference of the voltage regulator.

4. The nuclear power plant pressurizer support system according to claim 1, characterized in that, The lower radial limiting assembly includes 4 to 8 radial limiters, each radial limiter being evenly distributed along the circumference of the voltage regulator.

5. The nuclear power plant pressurizer support system according to claim 2, characterized in that, An adjustment assembly is provided between the support base and the boss. The adjustment assembly includes two side slide plates, two side adjustment plates, a horizontal sliding plate, and a horizontal adjustment plate.

6. The nuclear power plant pressurizer support system according to claim 5, characterized in that, The side slide plates are respectively disposed on both sides of the boss, the support seat is provided with a groove, and the lateral adjustment plates are respectively disposed on the two side walls of the groove of the support seat. The side slide plates and the corresponding lateral adjustment plates are in sliding contact. The horizontal sliding plate is disposed on the bottom surface of the boss, and the horizontal adjustment plate is disposed on the bottom surface of the groove of the support seat. The horizontal sliding plate and the horizontal adjustment plate are in sliding contact.

7. The nuclear power plant pressurizer support system according to claim 6, characterized in that, A preset radial expansion gap is provided between the lateral adjustment plate and the side slide plate. The lateral adjustment plate is formed by processing to a preset thickness to allow the side slide plate to slide relative to the boss when the boss expands radially.

8. The nuclear power plant pressurizer support system according to claim 2, characterized in that, A leveling component is provided below the shear-resistant member, which is used to adjust the elevation of the support seat before secondary pouring.

9. The nuclear power plant pressurizer support system according to claim 2, characterized in that, Each of the aforementioned pull rods is also provided with: A sleeve is embedded in the upper floor slab, and the tie rod passes through the sleeve; An anchor plate is provided at the lower end of the tie rod and located below the upper floor slab, for anchoring the tie rod to the upper floor slab; Two spherical washers and two pads are provided, one of which is located at the upper end of the pull rod and between the fastener and the pressure plate, and the other is located at the lower end of the pull rod and between the anchor plate and the fastener used to lock the anchor plate, with each spherical washer adjacent to the corresponding fastener.

10. The nuclear power plant pressurizer support system according to claim 2, characterized in that, Each of the support seats is provided with an upper surface ring and a plurality of reinforcing ribs, each reinforcing rib extending radially from the shear-resistant member to the upper surface ring; the upper surface ring is arc-shaped.

11. The nuclear power plant pressurizer support system according to claim 1, characterized in that, A secondary grouting layer is provided between the bottom surface of the support base and the upper floor slab.

12. The nuclear power plant pressurizer support system according to claim 2, characterized in that, The shear-resistant member has a horizontal flange and two vertical portions. The horizontal flange forms the bottom of the support base, and the two vertical portions are arranged parallel to each other below the horizontal flange. Each vertical portion has a plate on its side. The vertical section and the plate are both embedded in the secondary concrete pouring of the upper floor slab.

13. The nuclear power plant pressurizer support system according to claim 1, characterized in that, All the support seats of the upper support assembly are connected as one piece to form an integral ring support seat.

14. The nuclear power plant pressurizer support system according to claim 1, characterized in that, Each of the radial limiters includes: Multiple pre-embedded anchors are fixed to the lower floor slab in a single pouring process. Connecting plate; Multiple connecting sleeves are vertically arranged on the connecting plate, and each connecting sleeve is respectively fitted onto the corresponding primary pre-embedded anchor. An anchoring base plate is arranged parallel to and spaced apart from the connecting plate, and is fixedly connected to the connecting plate through the connecting sleeve; The connecting plate, the anchoring foundation plate, and the connecting sleeve are fixed to the lower floor slab by secondary casting. An adjusting stud is vertically installed on the anchoring base plate, and the head of the adjusting stud is used to abut against the lower body of the voltage regulator. A lock nut is screwed onto the adjusting stud to lock the position of the adjusting stud.

15. A pressurizer device for a nuclear power plant, characterized in that, include: Voltage regulator body; And a voltage regulator support system as described in any one of claims 1 to 14, wherein the voltage regulator support system is connected to the voltage regulator body.

16. The nuclear power plant pressurizer equipment according to claim 15, characterized in that, The upper support assembly includes three support seats, and the voltage regulator body is provided with three integral forged bosses. The three integral forged bosses are arranged in one-to-one correspondence with the three support seats, and the integral forged bosses and the voltage regulator body are an integral forged structure without weld seams.

17. An installation method for a pressurizer support system in a nuclear power plant, characterized in that, Includes the following steps: When the upper floor slab of the factory building is poured in one go, sleeves are pre-embedded and shear-resistant component installation pits are reserved; when the lower floor slab is poured in one go, pre-embedded anchors are pre-embedded. The support seat is hoisted into place, and the shear-resistant component of the support seat falls into the shear-resistant component installation pit. After the elevation of the support seat is adjusted by the leveling component, a second pour is carried out to fix the support seat. The connecting plate, connecting sleeve, and anchoring base plate are placed on the lower floor slab, and the connecting sleeve is fitted onto the primary pre-embedded anchor. A secondary pour is then performed to fix the connecting plate, the connecting sleeve, and the anchoring base plate. The voltage regulator is hoisted into place so that the upper boss of the voltage regulator sits on the support surface of the support base; The thickness of the horizontal adjustment plate and the lateral adjustment plate are machined according to the measured installation error to compensate for the installation error between the boss and the support seat; and a radial expansion gap is formed between the boss and the side wall of the groove. Install the pressure plate, tie rod, and fasteners to press the pressure plate against the boss; Adjust the adjusting stud to preset the cold gap between the adjusting stud and the lower body of the voltage regulator.

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