Reactor pressure vessel shell and core support structure assembly system and installation method

Abstract

This invention discloses an assembly system and installation method for a reactor pressure vessel shell and core support structure. The assembly system includes a pre-assembly workshop, a crane, and a gantry crane. The pre-assembly workshop is located outside the reactor building and has an openable and closable roof. Inside the pre-assembly workshop, there is an equipment assembly area aligned vertically with the roof, containing multiple assembly pits and multiple operating platforms. The crane is located inside the pre-assembly workshop and is capable of sequentially lifting multiple shells into the assembly pits to assemble them into a core shell shell, and sequentially lifting multiple core support structure components into the core shell shell to assemble them into a core support structure. The gantry crane is capable of lifting the reactor pressure vessel shell into another assembly pit, lifting the core support structure into the reactor pressure vessel shell to assemble it into a combination of the reactor pressure vessel shell and core support structure, and lifting the combination into the reactor compartment of the reactor building for installation.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant construction technology, and in particular to the assembly system and installation method of reactor pressure vessel shell and core support structure. Background Technology

[0002] The original process for installing the reactor pressure vessel shell and core support structure of a high-temperature gas-cooled reactor was as follows: after the civil construction of the reactor compartment was completed, the reactor pressure vessel shell was installed, and then the core support structure was installed inside it. This process took up a long main construction period of no less than 6 months, which was not conducive to improving the economic efficiency of high-temperature gas-cooled reactor construction. Summary of the Invention

[0003] In view of this, the present invention provides a reactor pressure vessel shell and core support structure assembly system, which allows the pre-assembly of the reactor pressure vessel shell and core support structure and the reactor compartment civil construction to be carried out in parallel. After the reactor compartment civil construction is completed, the reactor pressure vessel shell and core support structure are then installed as a whole, thereby helping to shorten the main construction period of the high-temperature gas-cooled reactor and improve the economy of the high-temperature gas-cooled reactor.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A reactor pressure vessel shell and core support structure assembly system, applied to high-temperature gas-cooled reactor nuclear power engineering, includes: a pre-assembly building, a crane and a gantry crane;

[0006] The pre-assembly workshop is located outside the reactor building and has an openable and closable roof. The pre-assembly workshop has an equipment assembly area that is vertically aligned with the roof. The equipment assembly area has multiple assembly pits and multiple operating platforms, with each operating platform corresponding to one of the multiple assembly pits.

[0007] The crane is located in the pre-assembly workshop and is capable of sequentially lifting multiple cylinders moved into the pre-assembly workshop into one of the assembly pits to assemble them into a reactor core shell cylinder, and is capable of sequentially lifting multiple reactor core support structure components moved into the pre-assembly workshop into the reactor core shell cylinder to assemble them into a reactor core support structure.

[0008] The gantry crane is used to span across the reactor building and the pre-assembly building, and can move back and forth between the reactor building and the pre-assembly building. The gantry crane can lift the reactor pressure vessel into another assembly pit, lift the core support structure into the reactor pressure vessel to assemble it into a combination of the reactor pressure vessel and the core support structure, and lift the combination out of the pre-assembly building and into the reactor compartment of the reactor building for installation.

[0009] Preferably, the pre-assembly plant includes: an above-ground portion and an underground portion;

[0010] The above-ground portion of the pre-assembly plant is located above ground; the underground portion of the pre-assembly plant is located underground and is connected to the above-ground portion of the pre-assembly plant; the equipment assembly area is located at the bottom of the underground portion of the pre-assembly plant and extends upward into the above-ground portion of the pre-assembly plant; the roof is located at the top of the above-ground portion of the pre-assembly plant; the crane is located on the above-ground portion of the pre-assembly plant and spans across the underground portion of the pre-assembly plant.

[0011] Preferably, the plurality of assembly slots are divided into two rows, and each row has a plurality of assembly slots, which are distributed in a one-to-one correspondence.

[0012] Preferably, the floor area of ​​the above-ground portion of the pre-assembly plant is larger than the floor area of ​​the underground portion of the pre-assembly plant.

[0013] Preferably, the pre-assembly plant has a parts storage and large parts cleaning area on the ground floor, located on one side of the equipment assembly area.

[0014] Preferably, the above-ground portion of the pre-assembly plant includes a small parts degreasing area, an air compressor room, a power distribution room, a tool room, a personnel preparation area, and / or an office area, and is located on the other side of the equipment assembly area.

[0015] A method for installing a reactor pressure vessel shell and core support structure, comprising the following steps, using the reactor pressure vessel shell and core support structure assembly system as described above for assembly and installation:

[0016] S1. Multiple cylinders and multiple core support structure components are transferred to the pre-assembly workshop using a transfer vehicle;

[0017] S2. Multiple cylinders are sequentially lifted into an assembly pit using a crane to assemble them into a reactor core shell cylinder.

[0018] S3. A gantry crane is used to first lift the reactor pressure vessel cylinder into another assembly pit, then the core shell cylinder is lifted into the reactor pressure vessel cylinder for assembly, and then a crane is used to lift multiple core support structure components into the core shell cylinder in sequence to assemble a combination of the reactor pressure vessel cylinder and the core support structure.

[0019] Alternatively, a crane can be used to hoist multiple core support structure components into the core shell to assemble them into a core support structure. Then, a gantry crane can be used to hoist the reactor pressure vessel into another assembly pit, and then the core support structure can be hoisted into the reactor pressure vessel to assemble a combination of the reactor pressure vessel and the core support structure.

[0020] S4. Use a gantry crane to lift the assembly from the pre-assembly building and into the reactor compartment of the reactor building for installation.

[0021] Preferably, in step S3, the process of using a crane to sequentially lift multiple core support structure components into the core shell to assemble them into a combination of the reactor pressure vessel shell and the core support structure includes:

[0022] Then, a crane is used to sequentially lift the bottom components, middle components, and top components of the core support structure into the core shell to assemble the reactor pressure vessel shell and the core support structure into a combined assembly.

[0023] Preferably, in step S3, the process of using a crane to sequentially lift multiple core support structure components into the core shell to assemble the core support structure includes:

[0024] A crane is used to sequentially lift the bottom components, middle components, and top components of the core support structure into the core shell to assemble the core support structure.

[0025] As can be seen from the above technical solution, the reactor pressure vessel cylinder and core support structure assembly system provided by the present invention allows the pre-assembly of the reactor pressure vessel cylinder and core support structure and the reactor compartment civil construction to be carried out in parallel. After the reactor compartment civil construction is completed, the reactor pressure vessel cylinder and core support structure assembly is then installed as a whole, which helps to shorten the main construction period of the high-temperature gas-cooled reactor and improve the economy of the high-temperature gas-cooled reactor.

[0026] The present invention also provides a method for installing a reactor pressure vessel shell and a core support structure. Since the above-mentioned reactor pressure vessel shell and core support structure assembly system is used for assembly and installation, it has corresponding beneficial effects, which can be referred to the previous description and will not be repeated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the pre-assembly plant structure provided in an embodiment of the present invention;

[0029] Figure 2 This is a floor plan of a pre-assembly plant provided in an embodiment of the present invention;

[0030] Figure 3 This is an elevation layout diagram of a pre-assembly plant provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the assembly of the reactor core shell provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the reactor pressure vessel cylinder being hoisted into the assembly area according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the assembly of the reactor core shell and the reactor pressure vessel shell provided in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the completed assembly of the reactor pressure vessel shell and the core support structure provided in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the reactor pressure vessel shell and core support structure assembly being lifted out of the pre-assembly building according to an embodiment of the present invention;

[0036] Figure 9 This is a hoisting and installation diagram of the reactor pressure vessel shell and core support structure assembly provided in an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the assembled core support structure provided in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the core support structure being hoisted into the reactor pressure vessel cylinder according to an embodiment of the present invention.

[0039] Among them, 01 is the component storage and large component cleaning area, 02 is the equipment assembly area, 03 is the circular corridor, 04 is the small component degreasing area, 05 is the air compressor room, 06 is the power distribution room, 07 is the tool room, 08 is the personnel preparation area, 09 is the office area, 10 is the crane, 11 is the equipment assembly and cleaning area, 12 is the operating platform, 13 is the first cylinder, 14 is the second cylinder, 15 is the third cylinder, 16 is the fourth cylinder, 17 is the reactor pressure vessel cylinder, 18 is the bottom component of the core support structure, 19 is the middle component of the core support structure, 20 is the top component of the core support structure, 21 is the core support structure, and 22 is the assembly pit; 100 is the underground part of the pre-assembly plant, 200 is the above-ground part of the pre-assembly plant, 300 is the roof, 400 is the core shell cylinder, 500 is the gantry crane, 600 is the assembly, 700 is the reactor building, and 800 is the reactor compartment. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The reactor pressure vessel shell and core support structure assembly system provided in this invention is applied to high-temperature gas-cooled reactor nuclear power engineering, such as... Figure 1 , Figure 3 and Figure 5 As shown, it includes: a pre-assembly workshop, crane 10 and gantry crane 500;

[0042] The pre-assembly workshop is located outside the reactor building 700 and has an openable and closable roof 300 on its top. Inside the pre-assembly workshop, there is an equipment assembly area 02 that is vertically aligned with the roof 300. The equipment assembly area 02 has multiple assembly pits 22 and multiple operating platforms 12, with each operating platform 12 corresponding to and surrounding the multiple assembly pits 22.

[0043] The crane 10 is located in the pre-assembly workshop and can sequentially lift multiple cylinders moved into the pre-assembly workshop into an assembly pit 22 to assemble them into a core shell cylinder 400, and can sequentially lift multiple core support structure components moved into the pre-assembly workshop into the core shell cylinder 400 to assemble them into a core support structure 21.

[0044] The gantry crane 500 is used to span across the reactor building 700 and the pre-assembly building, and can move back and forth between the reactor building 700 and the pre-assembly building. The gantry crane 500 can lift the reactor pressure vessel cylinder 17 into another assembly pit 22 (e.g., Figure 5As shown), the core support structure 21 can be hoisted into the reactor pressure vessel shell 17 to assemble it into a combination 600 of the reactor pressure vessel shell and the core support structure (as shown). Figure 6 and Figure 7 (as shown), and capable of lifting the assembly 600 from the pre-assembly building and into the reactor compartment 800 of the reactor building 700 for in-place installation (e.g. Figure 8 and Figure 9 (As shown).

[0045] It should be noted that, as Figure 1 As shown, during hoisting operations, the roof 300 of the gantry crane 500 is in the open position to serve as a hoisting access point for the pre-assembly workshop. Normally, the roof 300 is closed to maintain the enclosure of the pre-assembly workshop. Figure 3 As shown, each assembly pit 22 is equipped with an operating platform 12. The operating platform 12 surrounds the assembly pit 22 and has a multi-layer structure from bottom to top, which facilitates the sequential assembly of multiple cylinders from bottom to top. In addition, multiple cylinders and multiple core support structure components are transferred to the pre-assembly workshop by a transfer vehicle. In addition, this solution, through the cooperation of the crane 10 (80t crane) and the gantry crane 500, can realize the assembly method of first assembling the core support structure 21, and then assembling the core support structure 21 with the reactor pressure vessel shell 17 to form a combined assembly; in addition, the gantry crane 500 can also lift the core shell 400 into the reactor pressure vessel shell 17 for assembly, and the crane 10 can also lift multiple core support structure components into the core shell 400 in sequence to assemble the reactor pressure vessel shell and the core support structure into a combined assembly 600, which can realize another assembly method of first positioning the reactor pressure vessel shell 17, and then assembling the core support structure in the reactor pressure vessel shell 17 to form a combined assembly.

[0046] In other words, this scheme allows for the pre-assembly of the reactor pressure vessel cylinder 17 and the core support structure 21 into a single assembly within the pre-assembly building outside the nuclear island, using cranes and gantry cranes, while the reactor compartment civil construction is underway. After the reactor compartment civil construction is completed, the assembly of the reactor pressure vessel cylinder and core support structure is then hoisted into and installed within the reactor compartment using a gantry crane. This allows for the parallel construction of the reactor pressure vessel cylinder and core support structure with the reactor compartment civil construction. After the reactor compartment civil construction is completed, the assembly of the reactor pressure vessel cylinder and core support structure is then installed as a whole, thus helping to shorten the main construction period of the high-temperature gas-cooled reactor (saving at least 6 months per reactor) and improving the economic efficiency of the high-temperature gas-cooled reactor.

[0047] In this plan, such as Figure 1As shown, the pre-assembly plant includes: the above-ground portion 200 and the underground portion 100.

[0048] The above-ground portion 200 of the pre-assembly plant is located above ground; the underground portion 100 of the pre-assembly plant is located underground and is connected to the above-ground portion 200, such as... Figure 3 As shown, the equipment assembly area 02 is located at the bottom of the underground portion 100 of the pre-assembly plant and extends upwards into the above-ground portion 200 of the pre-assembly plant; the roof 300 is located at the top of the above-ground portion 200 of the pre-assembly plant; as shown... Figure 4 As shown, the crane 10 is located within the above-ground portion 200 of the pre-assembly plant and spans across the underground portion 100 of the pre-assembly plant. In other words, this solution places the equipment assembly area 02 of the pre-assembly plant underground, which helps to reduce the assembly height of the pre-assembly plant and also helps to reduce interference with equipment assembly.

[0049] Specifically, such as Figure 2 As shown, the multiple assembly pits 22 are arranged in two rows, with multiple assembly pits 22 in each row, and they are distributed in a one-to-one correspondence. This design helps to increase the pre-assembly capacity of the reactor pressure vessel shell and core support structure, thereby further shortening the main construction period of the high-temperature gas-cooled reactor.

[0050] In this embodiment of the solution, in order to facilitate the arrangement of other functional areas or other supporting areas within the above-ground portion 200 of the pre-assembly plant, such as... Figure 1 As shown, the floor area of ​​the above-ground portion 200 of the pre-assembly plant is larger than the floor area of ​​the underground portion 100 of the pre-assembly plant.

[0051] Furthermore, in order to achieve cleanliness in the storage of parts and the installation of large components, such as Figure 2 As shown, the pre-assembly plant's above-ground portion 200 includes a parts storage and large component cleaning area 01, located to one side of the equipment assembly area 02. The pre-assembly plant's above-ground portion 200 also features an openable and closable door on its side, facilitating the transfer of multiple cylinders and core support structure components into the pre-assembly plant when open.

[0052] Furthermore, to facilitate the provision of more comprehensive supporting measures for pre-assembly plants, such as... Figure 2 As shown, the pre-assembly plant above ground 200 includes a small parts degreasing area 04, an air compressor room 05, a power distribution room 06, a tool room 07, a personnel preparation area 08, and / or an office area 09, and is located on the other side of the equipment assembly area 02.

[0053] This invention also provides a method for installing a reactor pressure vessel shell and core support structure, which uses the reactor pressure vessel shell and core support structure assembly system described above for assembly and installation, and includes the following steps:

[0054] S1. Multiple cylinders and multiple core support structure components are transferred to the pre-assembly workshop using a transfer vehicle;

[0055] S2. Using crane 10, multiple cylinders are sequentially lifted into an assembly pit 22 to assemble them into a core shell cylinder 400 (e.g., ...). Figure 4 (as shown);

[0056] S3. Using a 500mm gantry crane, first lift the reactor pressure vessel cylinder 17 into another assembly pit 22 (e.g., ...). Figure 5 (As shown), then the core shell 400 is hoisted into the reactor pressure vessel shell 17 for assembly (as shown). Figure 6 (As shown), then crane 10 is used to sequentially lift multiple core support structure components into the core shell 400 to assemble them into a combination 600 of the reactor pressure vessel shell and core support structure (as shown). Figure 7 (as shown); Among them, assembling the core shell 400 into the reactor pressure vessel 17 and assembling multiple core support structure components into the core shell 400 in sequence to form a composite body both use existing assembly technologies, which will not be described in detail here.

[0057] Alternatively, a crane 10 can be used to sequentially lift multiple core support structure components into the core shell 400 to assemble the core support structure 21 (e.g., Figure 10 As shown), a gantry crane 500 is then used to first lift the reactor pressure vessel cylinder 17 into another assembly pit 22 (as shown). Figure 5 (As shown), the core support structure 21 is then hoisted into the reactor pressure vessel cylinder 17 to assemble it into a combination 600 of the reactor pressure vessel cylinder and the core support structure (as shown). Figure 11 (as shown);

[0058] S4. Using a gantry crane 500, the assembly 600 is lifted from the pre-assembly workshop and into the reactor compartment 800 of the reactor building 700 for installation (e.g., Figure 8 and Figure 9 (As shown).

[0059] It should be noted that this plan uses a transfer vehicle to move multiple cylinders and multiple core support structure components into the parts storage and large component cleaning area 01 for storage or cleaning. Furthermore, if... Figure 4As shown, crane 10 is a small gantry crane that spans the parts storage and large component cleaning area 01 and the equipment assembly area 02, so that crane 10 can lift the cylinder or core support structure components from the parts storage and large component cleaning area 01 into the assembly pit 22 of the equipment assembly area 02; as Figure 4 As shown, in step S2, a crane 10 is used to hoist four cylinders (fourth cylinder 16, third cylinder 15, second cylinder 14, and first cylinder 13) into assembly pit 22 to assemble them into core shell cylinder 400. First, the crane 10 hoists the fourth cylinder 16 (core shell cylinder four) onto the 15 sets of support platforms located at the bottom of assembly pit 22, and adjusters of different thicknesses are installed between the fourth cylinder 16 and the 15 sets of support platforms to adjust the fourth cylinder 16 to a horizontal state. Then, the crane 10 hoists the third cylinder 15 (core shell cylinder three) onto the fourth cylinder 16, and connects the third cylinder 15 and the fourth cylinder 16 into a whole using bolts, anti-shear sleeves, etc. Similarly, the second cylinder 14 and the first cylinder 13 are hoisted and assembled in the same manner, which will not be described in detail here. Of course, since this scheme uses the above-mentioned reactor pressure vessel shell and core support structure assembly system for assembly and installation, it also has corresponding beneficial effects, which can be referred to the previous explanation and will not be repeated here.

[0060] In this scheme, in step S3, the crane 10 is then used to sequentially lift multiple core support structure components into the core shell 400 to assemble them into a combination 600 of the reactor pressure vessel shell and the core support structure, including:

[0061] Then, using crane 10, the bottom component 18, the middle component 19, and the top component 20 of the core support structure are sequentially lifted into the core shell 400 to assemble the reactor pressure vessel shell and core support structure assembly 600 (e.g., Figure 7 (As shown).

[0062] Specifically, in step S3, the process of using a crane 10 to sequentially lift multiple core support structure components into the core shell 400 to assemble the core support structure 21 includes:

[0063] The bottom components 18 of the core support structure (including upper and lower cover plates of the support seat assembly, support roller assembly, ball outlet pipe, ball outlet connecting pipe, and lower support plate, etc.), the middle components 19 of the core support structure (including graphite and carbon core support structures, anti-spin components, clamping bands, and limiting I-beams, etc.), and the top components 20 of the core support structure (including positioning plates, pressure plates, disc spring assemblies, and upper support plates, etc.) are sequentially hoisted into the core shell 400 by crane 10 to assemble the core support structure 21 (e.g., Figure 10 (As shown).

[0064] The following is a further description of this solution with reference to specific embodiments:

[0065] The reactor pressure vessel shell and core support structure installation method provided by the present invention includes two main parts: an off-site assembly method for the reactor pressure vessel shell and core support structure, and an installation method for the reactor pressure vessel shell and core support structure assembly.

[0066] I. The off-site assembly method for the reactor pressure vessel shell and core support structure includes the following steps:

[0067] (1) Construct a pre-assembly plant; (see...) Figure 1 , 2 )

[0068] (2) Environmental control of the assembly area: The temperature and humidity of the plant are controlled by arranging dehumidifiers, heaters, air conditioners and continuously supplying clean and dry compressed air in the assembly area.

[0069] (3) Basic preparations before module assembly: This mainly involves measuring the height difference of 15 support platforms and installing adjustment shims of appropriate thickness on the support platforms to provide a good foundation for the placement of the core shell; among which, such as Figure 4 As shown, the support platform is located at the bottom of the assembly pit;

[0070] (4) Complete the assembly of the core shell within the assembly area; (see...) Figure 4 )

[0071] Method 1:

[0072] (5) Position the reactor pressure vessel shell within the assembly area; (see...) Figure 5 )

[0073] (6) Complete the installation of the core shell inside the reactor pressure vessel; (see...) Figure 6 )

[0074] (7) Assemble the bottom components of the core support structure within the reactor pressure vessel; (see...) Figure 7 )

[0075] (8) Complete the assembly of the middle components of the core support structure inside the reactor pressure vessel; (see...) Figure 7 )

[0076] (9) Assemble the top components of the core support structure within the reactor pressure vessel. (See...) Figure 7 )

[0077] Method 2:

[0078] (5) Complete the assembly of the bottom components of the core support structure within the assembly area;

[0079] (6) Complete the assembly of the middle components of the core support structure within the assembly area;

[0080] (7) Complete the assembly of the top components of the core support structure within the assembly area; (see...) Figure 10 )

[0081] (8) Position the reactor pressure vessel shell within the assembly area; (see...) Figure 5 )

[0082] (9) Complete the assembly of the reactor pressure vessel shell and core support structure within the assembly area. (See...) Figure 7 , 11 )

[0083] II. The installation method for the reactor pressure vessel shell and core support structure assembly includes the following steps:

[0084] (1) Preparations before connecting slings;

[0085] (2) Installation of the guide device before lifting the reactor pressure vessel shell and core support structure assembly;

[0086] (3) Connection between the gantry crane and the reactor pressure vessel shell and the core support structure assembly;

[0087] (4) Leveling and trial lifting;

[0088] (5) Use a gantry crane to hoist the reactor pressure vessel shell and core support structure assembly into the reactor compartment; (see...) Figure 8 )

[0089] (6) The reactor pressure vessel shell and core support structure assembly are positioned and secured. (See...) Figure 9 )

[0090] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0091] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reactor pressure vessel shell and core support structure assembly system, applied in high-temperature gas-cooled reactor nuclear power engineering, characterized in that, include: Pre-assembly workshop, crane (10) and gantry crane (500); The pre-assembly workshop is located outside the reactor building (700) and has an openable and closable roof (300) on its top. The pre-assembly workshop has an equipment assembly area (02) that is vertically aligned with the roof (300). The equipment assembly area (02) has multiple assembly pits (22) and multiple operating platforms (12). The multiple operating platforms (12) are arranged one-to-one around the multiple assembly pits (22). The crane (10) is located in the pre-assembly workshop and is capable of sequentially lifting multiple cylinders moved into the pre-assembly workshop into an assembly pit (22) to assemble them into a core shell cylinder (400), and is capable of sequentially lifting multiple core support structure components moved into the pre-assembly workshop into the core shell cylinder (400) to assemble them into a core support structure (21). The gantry crane (500) is used to span across the reactor building (700) and the pre-assembly building, and can move back and forth between the reactor building (700) and the pre-assembly building. The gantry crane (500) can lift the reactor pressure vessel cylinder (17) into another assembly pit (22), can lift the core support structure (21) into the reactor pressure vessel cylinder (17) to assemble it into a combination of the reactor pressure vessel cylinder and the core support structure (600), and can lift the combination (600) out of the pre-assembly building and into the reactor compartment (800) of the reactor building (700) for installation.

2. The reactor pressure vessel shell and core support structure assembly system according to claim 1, characterized in that, The pre-assembly plant includes: the above-ground portion (200) of the pre-assembly plant and the underground portion (100) of the pre-assembly plant; The above-ground portion (200) of the pre-assembly plant is located above ground; the underground portion (100) of the pre-assembly plant is located underground and is connected to the above-ground portion (200) of the pre-assembly plant; the equipment assembly area (02) is located at the bottom of the underground portion (100) of the pre-assembly plant and extends upward into the above-ground portion (200) of the pre-assembly plant; the roof (300) is located at the top of the above-ground portion (200) of the pre-assembly plant; the crane (10) is located in the above-ground portion (200) of the pre-assembly plant and spans across the top of the underground portion (100) of the pre-assembly plant.

3. The reactor pressure vessel shell and core support structure assembly system according to claim 2, characterized in that, The assembly slots (22) are divided into two rows, and the number of assembly slots (22) in each row is multiple, and they are distributed one-to-one.

4. The reactor pressure vessel shell and core support structure assembly system according to claim 2, characterized in that, The floor area of ​​the above-ground portion (200) of the pre-assembly plant is greater than the floor area of ​​the underground portion (100) of the pre-assembly plant.

5. The reactor pressure vessel shell and core support structure assembly system according to claim 4, characterized in that, The pre-assembly plant above ground (200) has a parts storage and large parts cleaning area (01) located on one side of the equipment assembly area (02).

6. The reactor pressure vessel shell and core support structure assembly system according to claim 4, characterized in that, The pre-assembly plant above ground (200) includes a small parts degreasing area (04), an air compressor room (05), a power distribution room (06), a tool room (07), a personnel preparation area (08), and / or an office area (09), and is located on the other side of the equipment assembly area (02).

7. A method for installing the reactor pressure vessel shell and core support structure, characterized in that, The reactor pressure vessel shell and core support structure assembly system as described in any one of claims 1-6 is used for assembly and installation, and includes the following steps: S1. Multiple cylinders and multiple core support structure components are transferred to the pre-assembly workshop using a transfer vehicle; S2. A crane (10) is used to lift multiple cylinders into an assembly pit (22) in sequence to assemble them into a core shell cylinder (400); S3. Using a gantry crane (500), the reactor pressure vessel cylinder (17) is first hoisted into another assembly pit (22), and then the core shell cylinder (400) is hoisted into the reactor pressure vessel cylinder (17) for assembly. Then, a crane (10) is used to hoist multiple core support structure components into the core shell cylinder (400) in sequence to assemble them into a combination of the reactor pressure vessel cylinder and the core support structure (600). Alternatively, a crane (10) can be used to hoist multiple core support structure components into the core shell cylinder (400) in sequence to assemble the core support structure (21). Then, a gantry crane (500) can be used to hoist the reactor pressure vessel cylinder (17) into another assembly pit (22), and then the core support structure (21) can be hoisted into the reactor pressure vessel cylinder (17) to assemble the reactor pressure vessel cylinder and the core support structure into a combination (600). S4. The assembly (600) is lifted out of the pre-assembly building and into the reactor compartment (800) of the reactor building (700) using a gantry crane (500) for installation.

8. The method for installing the reactor pressure vessel shell and core support structure according to claim 7, characterized in that, In step S3, a crane (10) is then used to sequentially lift multiple core support structure components into the core shell (400) to assemble them into a combination (600) of the reactor pressure vessel shell and the core support structure, including: Then, a crane (10) is used to hoist the bottom component (18), the middle component (19), and the top component (20) of the core support structure into the core shell (400) in sequence to assemble them into a combination of the reactor pressure vessel shell and the core support structure (600).

9. The method for installing the reactor pressure vessel shell and core support structure according to claim 7, characterized in that, In step S3, the process of using a crane (10) to sequentially lift multiple core support structure components into the core shell (400) to assemble them into a core support structure (21) includes: A crane (10) is used to hoist the bottom component (18), the middle component (19), and the top component (20) of the core support structure into the core shell (400) in sequence to assemble the core support structure (21).

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