Reactor pressure vessel top cover and reactor internal components lifting guide device

Abstract

The present invention provides a reactor pressure vessel top cover and internal component hoisting guide device, which relates to the reactor pressure vessel technical field. The hoisting guide device includes at least two support blocks and at least two guide columns. The at least two support blocks are arranged on the outer periphery of the reactor pressure vessel cylinder flange; the support blocks are welded to the outer periphery of the reactor pressure vessel cylinder flange or are arranged integrally; a guide column is correspondingly installed on each support block, and the guide column is used to hoist the top cover and / or the internal component. In the above device, the guide column is installed on the support block outside the main bolt hole, and the main bolt hole is not occupied during the service life, so the guide column can be permanently stationed on the reactor pressure vessel cylinder flange; the root of the guide column adopts a mechanical seal, which can eliminate the use and replacement of the sealing ring; the setting method of the guide column can realize the adjustment of the length of the guide column without drainage; the present invention saves the time of disassembling, storing and maintaining the guide column when the reactor pressure vessel top cover and internal component are hoisted from the above three aspects.

Description

Technical Field

[0001] The invention relates to the technical field of reactor pressure vessels, and in particular to a reactor pressure vessel top cover and a reactor internal component hoisting guide device. Background Art

[0002] The reactor pressure vessel (RPV) is a key equipment in the primary reactor coolant system of a nuclear power plant. It belongs to the primary pressure boundary and contains the reactor core and related supports (i.e., reactor internals) as well as the coolant.

[0003] During the operation of a nuclear power plant, the reactor pressure vessel cover needs to be lifted off regularly, and then the internal components of the reactor need to be lifted out to carry out related work such as material replacement and maintenance.

[0004] The hoisting (including lifting and lowering) of the top cover and internal components requires the use of guide devices to prevent collision and mechanical damage between equipment due to insufficient positioning accuracy of the ring hoist and the deflection of the equipment itself. Therefore, the top cover and internal component hoisting guide device (hereinafter referred to as "guide device") plays an important role in ensuring the safe and stable operation of the main equipment.

[0005] In conventional nuclear power plants, the guide devices include guide posts, bushings and other components, which are installed temporarily.

[0006] That is, using the threaded holes of the main bolts of the reactor pressure vessel, after the main bolts are removed, the bushings are installed in the threaded holes of the main bolts, and then the guide posts are temporarily installed in the bushings. After the refueling overhaul is completed and the cover is buckled, the bushings and guide posts are removed.

[0007] This solution requires the installation and removal of guide columns and corresponding bushings during each refueling and maintenance, and a guide column storage rack must be specially set up on the wall of the refueling pool, and then the removed guide columns are stored on the corresponding storage rack using a ring crane. The process of this solution is relatively cumbersome, time-consuming and labor-intensive, and it takes about 2 hours of the main line time for refueling and maintenance, and the operating economy is poor.

[0008] Based on this, the inventor of the present application proposes a reactor pressure vessel top cover and reactor internal component lifting guide device in order to solve the above technical problems. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the defect of low assembly and disassembly efficiency of pressure vessel top cover and internal components in the prior art, and to provide a reactor pressure vessel top cover and internal component hoisting guide device.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] The present invention provides a reactor pressure vessel top cover and reactor internal component hoisting guide device, comprising:

[0012] At least two support blocks are arranged on the outer periphery of the reactor pressure vessel barrel flange; wherein the support blocks are welded to or integrally arranged with the outer periphery of the reactor pressure vessel barrel flange;

[0013] At least two guide posts, one of which is mounted on each support block, and the guide posts are used for hoisting the top cover and / or the internal components of the pile.

[0014] According to an embodiment of the present invention, a mounting hole is provided on the support block, and one end of the guide column is inserted and sealed in the mounting hole.

[0015] According to one embodiment of the present invention, the support block is provided with a bushing in the mounting hole, and the bushing is fixedly connected to the support block; or, the bushing is formed by a corrosion-resistant alloy that is welded in the mounting hole;

[0016] The bushing is provided with a containing chamber, and one end of the guide column is inserted into the containing chamber to be connected with the bushing.

[0017] According to an embodiment of the present invention, the bushing is threadedly connected to the support block, and one end of the bushing extending into the mounting hole is matched with the inner wall hole axis of the mounting hole.

[0018] According to one embodiment of the present invention, at least one protrusion is provided on the outer wall of the bottom of the guide column or the inner wall of the accommodating chamber of the bushing along the axial direction of the guide column;

[0019] The protrusion is arranged around the outer circumference of the guide column; or, the protrusion is arranged along the circumference of the inner wall of the accommodating chamber;

[0020] The protrusion abuts against the inner wall of the accommodating chamber or the outer wall of the guide column.

[0021] According to one embodiment of the present invention, an L-shaped groove is provided in the accommodating chamber of the bushing;

[0022] A protrusion is provided on the outer wall of the guide column. When the guide column is in a rotating state, the protrusion is screwed into the L-shaped groove to axially lock the guide column.

[0023] According to an embodiment of the present invention, the protrusion is connected to the guide column via a threaded connector; or, the protrusion and the guide column are integrally formed.

[0024] According to an embodiment of the present invention, the upper end surface of the bushing is planarly fitted and sealed with the flange surface of the lower end of the guide column.

[0025] According to one embodiment of the present invention, the upper end portion of the bushing is connected to the support block by means of a grommet weld.

[0026] According to one embodiment of the present invention, the upper end portion of the bushing is sealed to the support block via a first sealing ring.

[0027] According to one embodiment of the present invention, a mounting and disassembly groove is provided on the top of the accommodating chamber of the bushing for use in disassembling and assembling the bushing with an external tool.

[0028] According to an embodiment of the present invention, a locking ring is provided at one end of the guide column inserted into the mounting hole, and the locking ring is threadedly matched with the support block.

[0029] According to an embodiment of the present invention, a locking pad is provided at the bottom of the locking ring, and the locking pad is connected to the guide column via a threaded connector.

[0030] According to an embodiment of the present invention, a matching block is provided on the outer end surface of the guide column, and the matching block abuts against the inner wall of the mounting hole.

[0031] According to an embodiment of the present invention, the guide column is connected to the top of the mounting hole via a second sealing ring.

[0032] According to one embodiment of the present invention, the overall length of the guide column is fixed or adjustable;

[0033] When the overall length of the guide column is adjustable, the guide column is divided into multiple sections, and the multiple sections of the guide column are detachably connected.

[0034] The positive and progressive effects of the present invention are:

[0035] The reactor pressure vessel top cover and internal component hoisting guide device of the present invention has a guide column installed on a support block outside a main bolt hole and does not occupy the main bolt hole during its service life, so the guide column can be permanently stationed on the reactor pressure vessel barrel flange.

[0036] In addition, a mechanical seal is used at the root of the guide column, which eliminates the need for the use and replacement of sealing rings. This saves time in disassembling, storing and maintaining the guide column during the installation of the reactor pressure vessel top cover and internal components, thereby improving the efficiency and economy of the operation and maintenance of the nuclear power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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:

[0038] Figure 1 It is a schematic diagram of the installation structure of the reactor pressure vessel top cover and the reactor internal component hoisting guide device of the present invention;

[0039] Figure 2 for Figure 1 Schematic diagram of embodiment 1 in which the middle support block cooperates with the guide column;

[0040] Figure 3 for Figure 2 A top view of the middle bushing;

[0041] Figure 4 for Figure 3 Schematic diagram of some structures from the perspective of B in the middle;

[0042] Figure 5 for Figure 3 Schematic diagram of some structures from perspective A in the middle;

[0043] Figure 6 for Figure 1 Schematic diagram of Example 2 in which the middle support block cooperates with the guide column.

[0044] 1. Support block; 11. Mounting hole; 12. Bushing; 121. Accommodating chamber; 122. Protrusion; 123. L-shaped groove; 124. Ring weld; 125. First sealing ring; 126. Assembly and disassembly groove; 13. Abutment surface;

[0045] 2. Guide column; 21. Bump; 22. Threaded connector; 23. Locking ring; 24. Locking pad; 25. Matching block; 26. Second sealing ring;

[0046] 3. Reactor pressure vessel shell flange; 31. Main bolt hole. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] Please refer to Figures 1 to 6The present invention provides a reactor pressure vessel top cover and reactor internal component hoisting guide device, comprising at least two support blocks 1 and at least two guide columns 2, wherein at least two support blocks 1 are arranged on the outer periphery of the reactor pressure vessel cylinder flange 3. The support blocks 1 are welded to the outer periphery of the reactor pressure vessel cylinder flange 3 or are integrally arranged.

[0050] It should be noted that a guide column 2 is correspondingly mounted on each support block 1, and the guide column 2 is used for hoisting the top cover and / or the internal components of the pile.

[0051] A main bolt hole 31 is provided on the flange 3 of the conventional reactor pressure vessel cylinder. When the top of the reactor or the components inside the reactor need to be hoisted, the bolts in the main bolt hole 31 need to be removed, and then the guide column 2 needs to be installed. This increases the time for removing the main bolts and installing the guide column 2, which in turn causes the hoisting time to be too long.

[0052] Based on this, the present invention sets a support block 1 on the outer periphery of the reactor pressure vessel cylinder flange 3, and uses the support block 1 to install the guide column 2. As for the support block 1, the support block 1 can be welded with the reactor pressure vessel cylinder flange 3, or the support block 1 can be integrally processed when the reactor pressure vessel cylinder flange 3 is processed and produced.

[0053] Because the guide column 2 is installed in the hole of the support block 1 outside the main bolt hole 31, the main bolt hole 31 is not occupied during the service life, and the guide column 2 can be permanently stationed on the reactor pressure vessel cylinder flange 3, which saves the time of installing and disassembling the guide column 2 when lifting the reactor cover and internal components, thereby improving the efficiency and economy of the operation, maintenance and overhaul of the nuclear power unit.

[0054] Specifically, a mounting hole 11 is opened on the support block 1 , and one end of the guide column 2 is inserted and sealed in the mounting hole 11 .

[0055] That is, the guide column 2 cooperates with the mounting hole 11 on the support block 1 without occupying the main bolt hole 31 on the reactor pressure vessel barrel flange 3, thereby achieving the purpose of no need for disassembly or low-frequency disassembly of the guide column 2. Example 1

[0056] Please refer to Figures 2 to 5 The guide column 2 and the support block 1 are connected by a transition connection method of a bushing 12.

[0057] Specifically, the support block 1 is provided with a bushing 12 in the mounting hole 11 , and the bushing 12 is fixedly connected to the support block 1 ; or the bushing 12 is formed by a corrosion-resistant alloy that is welded in the mounting hole 11 .

[0058] An accommodating chamber 121 is defined in the bushing 12 , and one end of the guide post 2 is inserted into the accommodating chamber 121 to be connected to the bushing 12 .

[0059] It can be seen that when the top cover and / or the internal components of the pile are hoisted for refueling and maintenance, in order to reduce the radiation dose, the water level of the refueling pool needs to rise and the root of the guide column 2 will be submerged in the refueling water. Therefore, a sealing function needs to be provided at the root of the guide column 2 to prevent the refueling water from flowing into the mounting hole 11 at the root of the guide column 2.

[0060] The conventional sealing method only uses O-rings, but in the present invention, the guide column 2 is permanently located on the reactor pressure vessel flange 3, and the O-ring needs to withstand high temperature and high radiation. Even if a perfluoroether rubber O-ring that is resistant to high temperature, radiation, and corrosion is used, the O-ring needs to be replaced after several refueling cycles, otherwise the sealing effect cannot be satisfied.

[0061] Based on this, the upper end of the bushing 12 of the present invention is connected to the support block 1 by means of a circumferential weld 124 .

[0062] In this way, the bushing 12 and the support block 1 connected by welding can fully meet the sealing requirements, and the sealing effect is better than that of the sealing ring.

[0063] Optionally, in some other embodiments, the upper end of the bushing 12 and the support block 1 may also be sealed and connected via a first sealing ring 125 .

[0064] Furthermore, the bushing 12 in the present invention is threadedly connected to the support block 1 , and one end of the bushing 12 extending into the mounting hole 11 is axially matched with the inner wall hole of the mounting hole 11 .

[0065] That is, the present invention uses the bushing 12 to be threadedly connected with the support block 1, and at the same time, one end of the bushing 12 extending to the mounting hole 11 cooperates with the hole axis of the support block 1, so that the installation stability of the bushing 12 can be ensured.

[0066] Furthermore, at least one protrusion 122 is provided on the outer wall of the bottom of the guide column 2 or the inner wall of the accommodating chamber 121 of the bushing 12 along the axial direction of the guide column 2. The protrusion 122 is arranged around the outer circumference of the guide column 2, or the protrusion 122 is arranged along the circumference of the inner wall of the accommodating chamber 121, and the protrusion 122 abuts against the inner wall of the accommodating chamber 121 or the outer wall of the guide column 2.

[0067] It can be seen that the top surface of the bushing 12 is a horizontal finely machined surface, and the root of the guide column 2 is an abutment surface 13. After the root of the guide column 2 is installed in the accommodating chamber 121, the abutment surface 13 at the root of the guide column 2 is tightly matched with the upper end surface of the bushing 12 to achieve mechanical sealing during water flooding during material replacement.

[0068] In some other embodiments, an O-ring groove may be provided on the upper end surface of the bushing 12 , and an O-ring may be installed to seal the upper end surface 12 with the abutting surface 13 of the guide column 2 .

[0069] The above two sealing connection methods for the guide column 2 and the bushing 12 are both acceptable and are not limited here.

[0070] Please continue to refer to Figure 2 The bushing 12 is provided with at least two protrusions 122 on the inner wall of the accommodating chamber 121 along the axial direction of the bushing 12, and each protrusion 122 is arranged around the circumference of the bushing 12. In this way, when the guide column 2 is matched with the bushing 12, a tight fit between the outer wall of the guide column 2 and the protrusions 122 arranged on the inner wall of the bushing 12 is formed, thereby ensuring the sealing of the installation of the guide column 2 and the bushing 12.

[0071] Alternatively, at least one protrusion 122 is provided on the inner wall of the accommodating chamber 121 of the bushing 12 along the axial direction of the guide column 2 , and the protrusion 122 is circumferentially arranged around the inner wall of the accommodating chamber 121 .

[0072] Please continue to refer to Figure 3 and Figure 4 To ensure the installation stability of the guide column 2 and the bushing 12, an L-shaped groove 123 is provided in the accommodating chamber 121 of the bushing 12; correspondingly, a protrusion 21 is provided on the outer wall of the guide column 2. When the guide column 2 is rotated, the protrusion 21 is screwed into the L-shaped groove 123 to axially lock the guide column 2.

[0073] It can be seen that the bushing 12 and the support block 1 can be installed in advance, and will not be disassembled in a non-damaged state after installation. However, for the guide column 2, different disassembly and assembly requirements may require guide columns 2 of different lengths, so the guide column 2 has a lower frequency of disassembly and assembly requirements.

[0074] The present invention adopts a spiral installation method, which can meet the demand for quick disassembly and assembly of the guide column 2 to adapt to different usage scenarios.

[0075] The protrusion 21 can be integrally provided with the guide column 2, or assembled in the form of parts; if assembled in the form of parts, the protrusion 21 can be detachably connected to the guide column 2 by a threaded connector 22. The threaded connector 22 includes but is not limited to bolts, screws, etc.

[0076] A mounting and dismounting groove 126 is formed at the top of the accommodating chamber 121 of the bushing 12 for use in dismounting and mounting the bushing 12 with an external tool.

[0077] The shape of the disassembly groove can be compatible with the shape of the disassembly tool, for example, it can be T-shaped or "mountain"-shaped, so that it is convenient to disassemble the bushing 12 through the disassembly groove 126 when necessary. Example 2

[0078] Please refer to Figure 6The guide column 2 and the support block 1 are connected by direct thread connection.

[0079] Specifically, a locking ring 23 is provided at one end of the guide column 2 inserted into the mounting hole 11 , and the locking ring 23 is threadedly matched with the support block 1 .

[0080] The outer circumference of the locking ring 23 is provided with external threads, and the bottom circumference of the mounting hole 11 of the support block 1 is provided with internal threads matching the external threads, so that the guide column 2 and the support block 1 can be connected.

[0081] In one embodiment, the inner hole of the locking ring 23 is in a polygonal shape, which matches the shape of the end of the guide post 2 .

[0082] Furthermore, a locking pad 24 is provided at the bottom of the locking ring 23 , and the locking pad 24 is connected to the guide column 2 through a threaded connector.

[0083] The locking pad 24 is used to lock and install the locking ring 23. The above-mentioned threaded connector 22 is described here by taking a screw as an example, but this type is not limited.

[0084] Furthermore, the guide column 2 is connected to the top of the mounting hole 11 via a second sealing ring 26 .

[0085] Moreover, a matching block 25 is disposed on the outer end surface of the guide column 2 , and the matching block 25 abuts against the inner wall of the mounting hole 11 .

[0086] The matching block 25 is arranged along the outer circumference of the guide column 2 , and the matching block 25 is used for sealing and matching the guide column 2 and the support block 1 .

[0087] Specifically, a plurality of groups of matching blocks 25 may be provided along the axial direction of the guide column 2 , so that multiple sealing connections between the guide column 2 and the support block 1 may be achieved.

[0088] In one embodiment, the support block 1 is connected to the reactor pressure vessel barrel flange 3 by welding.

[0089] That is, the support block 1 is a segment or an integral annular structure, which is circumferentially arranged around the reactor pressure vessel barrel flange 3, and the support block 1 is arranged on the reactor pressure vessel barrel flange 3 by welding.

[0090] Optionally, the support block 1 is integrally arranged with the reactor pressure vessel barrel flange 3 .

[0091] For example, the support block 1 is made of the same material as the reactor pressure vessel barrel flange 3. When the reactor pressure vessel barrel flange 3 is processed and produced, the support block 1 is processed together with the reactor pressure vessel barrel flange 3, and there is no weld between the two.

[0092] It should be noted that the guide lengths required for hoisting the top cover and / or the upper internals and for hoisting the lower internals are different.

[0093] The conventional practice is to use only a relatively short set of guide columns 2, and to use visual, plumb line and other auxiliary methods to carry out the unguided journey when hoisting the lower internal components. This method has a greater risk of equipment collision damage; or after the top cover and upper internal components are hoisted, all relatively short guide columns 2 are removed, and a set of longer guide columns 2 are reinstalled for the installation of the lower internal components. This method requires lowering the water level before installation and disassembly, which takes about 6 hours of the main line time for refueling, and has relatively poor operating economy.

[0094] In the present invention, in order to avoid the main line time occupied by lowering the water level in the above situation, for the guide column 2, the length of at least one section of the guide column 2 along its axial direction is adjustable, and the multiple sections of the guide column 2 are detachably connected by a combination of any one or more of threads, sleeves, and slots.

[0095] The guide column 2 of the present invention is installed on the support block 1, and can then be permanently stationed on the reactor pressure vessel barrel flange 3, without having to consider the problem of disassembly and assembly when installed to the main bolt hole 31, thus saving main line time.

[0096] Secondly, the guide column 2 of the present invention includes segments with fixed lengths and segments with adjustable lengths, so the overall length of the guide column 2 can be adjusted without lowering the water level to meet the lifting and guiding requirements of the top cover, the upper internal components and the lower internal components. When the guide column 2 is segmented, the parts between the segments can be connected by a combination of one or more of threads, sleeves and slots.

[0097] Moreover, the structure of the guide column 2 can be a segmented structure with adjustable length, or a whole structure with an inseparable length.

[0098] For example, when it is necessary to hoist the top cover and the upper internals, the adjustable guide column 2 can be connected with a longer section at the bottom and a shorter section. When it is necessary to hoist the lower internals, the shorter sections at the top of all guide columns 2 are removed while maintaining the water level, and then at least one extension section of the guide column 2 is installed to increase its own length, thereby meeting the need to directly switch the length of the guide column 2 without lowering the refueling water level to meet the hoisting requirements of the lower internals.

[0099] With such arrangement, the present invention can directly switch the length of the guide column 2 without lowering the refueling water level, thereby shortening the main line time of refueling maintenance and improving the efficiency and economy of operation and maintenance of the nuclear power unit.

[0100] In summary, the present invention has at least the following advantages:

[0101] 1. The guide column 2 is installed on the support block 1 outside the main bolt hole 31 and does not occupy the main bolt hole 31 during its service life. Therefore, the guide column 2 can be permanently stationed on the reactor pressure vessel cylinder flange 3, saving the time for installing and removing the guide column 2 when the reactor pressure vessel top cover and the internal components are hoisted, thereby improving the efficiency and economy of the operation, maintenance and overhaul of the nuclear power unit.

[0102] 2. The present invention adopts the method of installing the guide column 2 by using the bushing 12. The bushing 12 and the support block 1 can be sealed by a weld, and the bushing 12 and the guide column 2 are mechanically sealed by surface-to-surface fitting, thereby eliminating the need for sealing maintenance at the root of the guide column 2 during the entire service life, saving the procurement cost of O-ring seals and the labor cost of installing, disassembling and replacing seals.

[0103] 3. The use of segmented guide column 2 can directly adjust the length of the guide column 2 without lowering the refueling water level, shortening the main line time of refueling maintenance and improving the efficiency and economy of operation and maintenance of nuclear power units.

[0104] 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.

[0105] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment" means 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 more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0106] 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. A reactor pressure vessel top cover and internal component hoisting guide device, characterized in that: include: At least two support blocks are arranged on the outer periphery of the reactor pressure vessel barrel flange; wherein the support blocks are welded to or integrally arranged with the outer periphery of the reactor pressure vessel barrel flange; At least two guide posts, one of which is mounted on each of the support blocks, the guide posts being used to hoist the top cover and / or the internal components of the reactor, and the guide posts being permanently located on the flange of the reactor pressure vessel cylinder; The support block is provided with a mounting hole, and one end of the guide column is inserted and sealed in the mounting hole; the support block is provided with a bushing in the mounting hole, and the bushing is welded to the support block; The upper end surface of the bushing is flatly fitted and sealed with the flange surface of the lower end of the guide column.

2. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 1, characterized in that: The bushing is provided with a containing chamber, and one end of the guide column is inserted into the containing chamber to be connected with the bushing.

3. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: The bushing is threadedly connected to the support block, and one end of the bushing extending into the mounting hole is matched with the inner wall hole axis of the mounting hole.

4. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: At least one protrusion is provided on the outer wall of the bottom of the guide column or the inner wall of the accommodating chamber of the bushing along the axial direction of the guide column; The protrusion is arranged around the outer circumference of the guide column; or, the protrusion is arranged along the circumference of the inner wall of the accommodating chamber; The protrusion abuts against the inner wall of the accommodating chamber or the outer wall of the guide column.

5. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: An L-shaped groove is provided in the accommodating chamber of the bushing; A protrusion is provided on the outer wall of the guide column. When the guide column is in a rotating state, the protrusion is screwed into the L-shaped groove to axially lock the guide column.

6. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 5, characterized in that: The protrusion is connected to the guide column via a threaded connector; or, the protrusion and the guide column are integrally formed.

7. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: The upper end of the bushing is connected to the support block by means of a grommet weld.

8. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: The upper end of the bushing is sealed and connected to the support block via a first sealing ring.

9. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 2, characterized in that: A mounting and dismounting groove is provided on the top of the accommodating chamber of the bushing for cooperating with an external tool to dismount and assemble the bushing.

10. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 1, characterized in that: One end of the guide column inserted into the mounting hole is provided with a locking ring, and the locking ring is threadedly matched with the support block.

11. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 10, characterized in that: A locking pad is provided at the bottom of the locking ring, and the locking pad is connected to the guide column through a threaded connector.

12. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 11, characterized in that: A matching block is provided on the outer end surface of the guide column, and the matching block abuts against the inner wall of the mounting hole.

13. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to claim 12, characterized in that: The guide column is connected to the top of the mounting hole via a second sealing ring.

14. The reactor pressure vessel top cover and reactor internal component hoisting guide device according to any one of claims 1 to 13, characterized in that: The overall length of the guide column is fixed or adjustable; When the overall length of the guide column is adjustable, the guide column is divided into multiple sections, and the multiple sections of the guide column are detachably connected.

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