Coaming assembly simulation device for lower reactor internals

Abstract

The utility model discloses a coaming assembly simulation device for lower reactor internals. The coaming assembly simulation device comprises a mounting base, at least one coaming simulation assembly and bolts, each coaming simulation assembly is arranged on the mounting base, and each coaming simulation assembly comprises a first unit plate, a second unit plate and a third unit plate; the first unit plate, the second unit plate and the third unit plate are respectively provided with a plurality of bolt holes, and bolts are installed in the bolt holes. The second unit plate is arranged between the first unit plate and the third unit plate, the first unit plate is perpendicular to the second unit plate and the third unit plate, the third unit plate is parallel to the first unit plate, the three unit plates define a working space together, and each unit plate can serve as a target coaming and can also serve as a target coaming. And the physical position interference factors can also be used as physical position interference factors of other unit plates, so that the same simulation device can be used for simulating three typical working positions where the physical position interference factors caused by surrounding parts need to be considered during coaming bolt welding seam maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of reactor lower internal components, in particular to a simulating device for a coaming assembly of a lower internal component. Background Art

[0002] The circulation loop of a pressurized water reactor includes a primary loop and a secondary loop. The primary loop is used to remove the heat from the reactor. The heat is transferred to the secondary loop through the steam generator to generate steam to drive the steam turbine to generate electricity. The primary loop is mainly composed of the reactor pressure vessel, internal components, fuel assemblies, steam generators, main pumps, pipelines, etc. The internal components include upper internal components and lower internal components.

[0003] The coaming assembly is an important component of the lower internal components, used to enclose the nuclear fuel assembly. It has multiple coamings connected to 8 layers of spokes by 960 bolts. The spokes are fixed to the basket cylinder by 544 bolts. Each bolt is spot welded on the coaming to prevent loosening. The working environment of the coaming assembly is complex, including high temperature, high pressure, strong neutron irradiation and vibration. After long-term operation, the coaming bolts as fasteners are prone to irradiation stress corrosion cracks and breakage. Damaged coaming bolts will cause the coaming connection to loosen and reduce the overall stiffness of the coaming assembly. Under the impact of the primary coolant, the loose coaming assembly will cause damage to the nuclear fuel assembly, so the coaming bolts need to be inspected or repaired regularly. In order to successfully complete the inspection and maintenance of the coaming bolts, how to provide skills training for technical personnel is an important part.

[0004] In practice, there are many parts and components in the lower pile internals, the working surface is limited, and it is in an irradiated environment. Close contact with the coaming assembly is harmful to personnel. Therefore, the operation drills and process assessments of coaming bolt maintenance inspections and weld repairs are greatly hindered. In addition, when developing some automated equipment for coaming bolt weld repairs, these equipment need to be tested for reliability before being put into use. However, before the equipment is verified to be qualified, for safety reasons, the testing of these equipment cannot be carried out directly in the lower pile internals space. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a simulation device which can be used for operation drill and process evaluation of the maintenance work of the bolt weld of the enclosure plate, and for the test of the automation equipment.

[0006] The technical solution adopted by the utility model to solve the technical problem is: to provide a coaming assembly simulation device for a lower internal component of the pile, which comprises a mounting base, at least one coaming simulation assembly, and bolts;

[0007] Each of the enclosure simulation components is arranged on the mounting base, and each of the enclosure simulation components comprises a first unit plate, a second unit plate and a third unit plate;

[0008] The second unit plate is arranged between the first unit plate and the third unit plate, and the first unit plate is perpendicular to the second unit plate, the second unit plate is perpendicular to the third unit plate, the third unit plate is parallel to the first unit plate, and the first unit plate, the second unit plate and the third unit plate together enclose a working space;

[0009] The first unit plate, the second unit plate and the third unit plate are respectively provided with a plurality of bolt holes, and the bolts are installed in the bolt holes.

[0010] Preferably, the mounting base comprises a base, a first support plate and a second support plate;

[0011] The first support plate and the second support plate are respectively connected to the base and are parallel to each other, and the base is respectively perpendicular to the first support plate and the second support plate;

[0012] The first unit plate is disposed on the first supporting plate, the third unit plate is disposed on the second supporting plate, and the second unit plate is disposed on the base.

[0013] Preferably, the substrate is a hollow frame structure.

[0014] Preferably, the base comprises four uprights, four upper supports and four lower supports;

[0015] The four upper supports and the four lower supports are parallel to each other in a one-to-one correspondence; the four upper supports are connected in sequence to form a rectangular plane, and the four lower supports are also connected in sequence to form a rectangular plane;

[0016] One end of each of the uprights is connected between two adjacent upper pillars, and the other end is connected between two adjacent lower pillars;

[0017] The first support plate and the second support plate are respectively connected to two adjacent columns, one end of the second unit plate and the first support plate are connected to the same column, and the other end of the second unit plate and the second support plate are connected to the same column.

[0018] Preferably, the base further comprises reinforcing ribs, and the reinforcing ribs are connected between at least one of the lower pillars and the upright column, and between at least one of the upper pillars and the upright column.

[0019] Preferably, the number of the enclosure simulation components is two, and the two enclosure simulation components are arranged in parallel in the height direction of the mounting base.

[0020] Preferably, a gap is formed between the two enclosure simulation components.

[0021] Preferably, it also includes a counterweight box connected to the mounting base.

[0022] Preferably, a lifting connection piece is provided on the mounting base.

[0023] Preferably, the length of the second unit board is greater than the lengths of the first unit board and the third unit board.

[0024] The utility model has at least the following beneficial effects: a workspace is enclosed by the first unit plate, the second unit plate and the third unit plate, each unit plate itself can be used as a target panel, and can also be used as a physical position interference factor of other unit plates, so that the same simulation device can be used to simulate three typical working positions that need to consider the physical position interference factors caused by surrounding components when repairing the panel bolt weld. In addition, the simulation device is simpler in structure than the real panel assembly, easy to disassemble and assemble on site, low in cost, easy to promote and use, and can be used to realize the operation drill and process evaluation of the panel bolt weld repair work, automated equipment testing, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0026] Figure 1 It is a schematic diagram of the top view of the structure of an existing reactor inner panel assembly;

[0027] Figure 2 It is a three-dimensional structural schematic diagram of a simulation device for a coaming assembly of a lower internal component of the first embodiment of the utility model;

[0028] Figure 3 It is a three-dimensional structural schematic diagram of a lower pile internals enclosure assembly simulation device of the second embodiment of the utility model;

[0029] Figure 4 It is a three-dimensional structural schematic diagram of a simulation device for a lower internal component of a pile according to a third embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0031] As described in the background technology, the lower internal components of the reactor have many parts and components, a limited working surface, and are in an irradiated environment, which greatly hinders the operation drills and process evaluation of the maintenance inspection of the coaming bolts, weld repairs, etc. In addition, when developing some automated equipment (such as laser welding equipment, non-destructive testing equipment, etc.) for the maintenance inspection of the coaming bolts, weld repairs, etc., there is no corresponding simulation device available in the prior art, and these automated equipment cannot be used directly in the lower internal component space before passing the test, which hinders the development and testing of new equipment. Therefore, the purpose of the utility model is to construct a coaming assembly simulation device for the lower internal components in view of the gap in the prior art.

[0032] An existing structure of a reactor inner panel assembly is as follows Figure 1 As shown, the shroud 11 and the radial plate 12 are arranged on the inner side of the core hanging basket 13. The shroud 11 has a bolt hole that penetrates along its thickness direction. The bolt 14 passes through the bolt hole and is arranged between the shroud 11 and the radial plate 12 to fix the shroud 11 on the radial plate 12. The bolt 14 includes a bolt body 141 and a locking pin 142. The bolt body 141 is arranged between the shroud 11 and the radial plate 12, and the locking pin 142 is connected to one end of the bolt body 141 close to the shroud 11. The spot welding position 15 when performing weld repair on the shroud bolt is located between the locking pin 142 and the bolt hole. Figure 1 It can be seen that the panel assembly includes a plurality of panels 11 distributed in a similar step-like manner, and the number of panels 11 is large and the distribution area is large. If the simulation device is designed according to the real panel assembly in a one-to-one ratio, the device will be bulky and complicated. At the same time, the simulation device should be able to sufficiently restore the on-site working conditions, so as to take into account the physical interference factors that may be encountered in actual work.

[0033] In particular, when developing some automated equipment for the weld repair of coaming bolts, and when testing these equipment, the components around the working position may become physical position interference factors. After a thorough analysis of the structural forms of the existing reactor inner coaming assemblies, it is found that there are roughly three typical working positions that require physical position interference factors to be considered when performing weld repairs on coaming bolts:

[0034] Figure 1 The small circle in the left overall top view indicates the position of a person or equipment, and the arrow connected by the small circle indicates the front direction of the person or equipment. In the same position, the front directions of the person or equipment are different, forming different working positions. The first working position L1 is: when facing one of the target panels 11, there are other components on the left side of the target panel 11, causing physical position interference; the second working position L2 is: when facing one of the target panels 11, there are other components on the right side of the target panel 11, causing physical position interference; the third working position L3 is: when facing one of the target panels 11, there are other components on both the left and right sides of the target panel 11, causing physical position interference.

[0035] The lower internal component enclosure assembly simulation device of the utility model simplifies the structure of the enclosure assembly according to the three working positions summarized from practical experience, and can represent the typical working positions when the enclosure bolt weld is repaired. Specifically, Figure 2 As shown, the enclosure assembly simulation device of the lower internal component of the first embodiment of the utility model (hereinafter referred to as the simulation device) includes a mounting base 3, at least one enclosure simulation assembly 2, and bolts 4. Each enclosure simulation assembly 2 is arranged on the mounting base 3, and each enclosure simulation assembly 2 includes a first unit plate 21, a second unit plate 22, and a third unit plate 23.

[0036] The second unit plate 22 is arranged between the first unit plate 21 and the third unit plate 23, and the first unit plate 21 and the second unit plate 22 are perpendicular to each other, the second unit plate 22 and the third unit plate 23 are perpendicular to each other, and the third unit plate 23 is parallel to the first unit plate 21. The first unit plate 21, the second unit plate 22 and the third unit plate 23 together enclose a C-shaped work space, which can accommodate equipment or personnel. That is, the first unit plate 21, the second unit plate 22 and the third unit plate 23 are located on the same side of the mounting base 3 (such as Figure 2 The first unit plate 21, the second unit plate 22 and the third unit plate 23 are respectively provided with a plurality of bolt holes, and the bolts 4 are installed in the bolt holes. Preferably, the bolts 4 on each unit plate pass through the corresponding unit plate and the mounting base 3, and the mounting base 3 serves as the mounting base of the enclosure simulation component 2 and also plays the role of simulating the spoke plate.

[0037] like Figure 2 As shown, when the simulation device is used, the bolt 4 on the first unit plate 21, the second unit plate 22 or the third unit plate 23 can be used as the target bolt for simulating weld repair, and the unit plate where the target bolt is located is the target panel. If the first unit plate 21 is used as the target panel, that is, when the weld repair object is intended to be the bolt 4 on the first unit plate 21, the second unit plate 22 is used as the physical position interference factor on the right side of the target panel, and the second working position L2 mentioned above can be simulated at this time; if the second unit plate 22 is used as the target panel, that is, when the weld repair object is intended to be the bolt 4 on the second unit plate 22, the first unit plate 21 and the third unit plate 23 are used as the physical position interference factors on the left and right sides of the target panel, and the third working position L3 mentioned above can be simulated at this time; if the third unit plate 23 is used as the target panel, that is, when the weld repair object is intended to be the bolt 4 on the third unit plate 23, the second unit plate 22 is used as the physical position interference factor on the left side of the target panel, and the first working position L1 mentioned above can be simulated at this time.

[0038] In summary, the simulation device of the utility model uses the first unit plate 21, the second unit plate 22 and the third unit plate 23 to enclose a workspace, and each unit plate itself can be used as a target enclosure plate, and can also be used as a physical position interference factor of other unit plates. Therefore, the same simulation device can be used to simulate three typical working positions that need to consider the physical position interference factors caused by surrounding components when repairing the enclosure plate bolt welds. In addition, the simulation device has a simpler structure than the real enclosure assembly, is easy to disassemble and assemble on site, has a low cost, and is easy to promote and use. It can be used to realize the operation drill and process evaluation of the enclosure plate bolt weld repair work, and the test of automated equipment.

[0039] Furthermore, if Figure 2 As shown, in the first embodiment, the length of the second unit board 22 is greater than the length of the first unit board 21, and the length of the second unit board 22 is also greater than the length of the third unit board 23. The lengths of the first unit board 21 and the third unit board 23 are roughly the same. Figure 1 and Figure 2 , in the third working position L3, the length of the target enclosure is greater than the length of the spokes on its left and right sides; and in part of the second working position L2, the target enclosure is shorter than the enclosure on its right side; in part of the first working position L1, the target enclosure is shorter than the enclosure on its left side. Corresponding to the above characteristics, setting the length of the second unit plate 22 to be greater than the lengths of the first unit plate 21 and the third unit plate 23 can be closer to the actual situation of the real enclosure assembly.

[0040] like Figure 2In the first embodiment shown, the mounting base 3 includes a base 30, a first support plate 31 and a second support plate 32. The first support plate 31 and the second support plate 32 are respectively connected to the base 30 and are parallel to each other, and the base 30 is respectively perpendicular to the first support plate 31 and the second support plate 32. The first unit plate 21 is arranged on the first support plate 31, the third unit plate 23 is arranged on the second support plate 32, and the second unit plate 22 is arranged on the base 30. Thus, the base 30, the first support plate 31 and the second support plate 32 provide mounting bases for the first unit plate 21, the second unit plate 22 and the third unit plate 23.

[0041] The bolts 4 on the first unit plate 21 pass through the first unit plate 21 and the first support plate 31, and the bolts 4 on the third unit plate 23 pass through the third unit plate 23 and the second support plate 32. The bolts 4 on the second unit plate 22 may pass through the second unit plate 22 and the base 30, or may be as shown in FIG. Figure 2 As shown, only the second unit plate 22 is passed through.

[0042] Furthermore, the first unit plate 21, the second unit plate 22 and the third unit plate 23 can be detachably connected to the first support plate 31, the base 30 and the second support plate 32, respectively, so as to facilitate the disassembly and assembly of each unit plate and the replacement of size and model. In addition, when simulating the third working position L3, the first unit plate 21 and the third unit plate 23 can also be removed, and the first support plate 31 and the second support plate 32 can be used as Figure 2 The web 12 in the enclosure assembly shown is closer to the actual situation of the third working position L3 on the enclosure assembly.

[0043] like Figure 2 In the first embodiment shown, the base 30 is a hollow frame structure. As a result, the overall volume and weight of the simulation device can be reduced, and it is convenient for on-site disassembly and assembly. Further, in order to ensure that the simulation device as a whole has good rigidity and stability, the simulation device can also include a counterweight box (not shown), which is connected to the mounting base 3 to provide a certain weight support for the mounting base 3 to prevent the simulation device from tipping over and shaking during use. The counterweight box can be arranged inside the frame of the base 30 of the frame structure and connected to the base 30.

[0044] like Figure 2In the first embodiment shown, the base 30 includes four columns 301, four upper pillars 302 and four lower pillars 303. The four columns 301 are perpendicular to the placement surface of the simulation device, and the four upper pillars 302 and the four lower pillars 303 are respectively parallel to the placement surface of the simulation device. The placement surface of the simulation device refers to the placement surface of the simulation device in a natural placement state. The four upper pillars 302 and the four lower pillars 303 are parallel to each other in a one-to-one correspondence. The four upper pillars 302 are connected in sequence to form a top rectangular plane, and the four lower pillars 303 are also connected in sequence to form a bottom rectangular plane. One end of each column 301 is connected between two adjacent upper pillars 302, and the other end is connected between two adjacent lower pillars 303, so as to be supported between the top rectangular plane and the bottom rectangular plane. The first support plate 31 and the second support plate 32 are respectively connected to two adjacent columns 301, one end of the second unit plate 22 and the first support plate 31 are connected to the same column 301, and the other end of the second unit plate 22 and the second support plate 32 are connected to the same column 301. Thus, the four upper pillars 302, the four pillars 301 and the four lower pillars 303 together form a hollow frame structure. The three-dimensional dimensions of the base 30 of the hollow frame structure of this embodiment are 1145 mm long, 680 mm wide, 1100 mm high, and weigh about 0.5 tons.

[0045] Alternatively, in other embodiments, the upper support 302, the upright 301 and the lower support 303 may be of other numbers. The base 30 may also be a hollow frame structure of other forms. For example Figure 3 In the second embodiment shown, unlike the first embodiment, there are three upper pillars 302 , and the three upper pillars 302 together enclose a triangular plane.

[0046] Furthermore, the base 30 may further include a reinforcing rib 304, and the reinforcing rib 304 may be connected between at least one lower support 303 and the column 301, and between at least one upper support 302 and the column 301. Figure 2 In the first embodiment shown, a reinforcing rib 304 is provided between each lower support 303 and the upright column 301, and between each upper support 302 and the upright column 301, and a total of 8 reinforcing ribs 304 are provided. The reinforcing rib 304 can strengthen the connection stability between the lower support 303 and the upright column 301, and between the upper support 302 and the upright column 301, thereby strengthening the overall rigidity and stability of the base 30.

[0047] Figure 1 In the panel assembly shown, the panel bolts are arranged in two rows on each panel. Correspondingly, the panel simulation assembly 2 of the simulation device can also be designed in two rows to be closer to the actual situation of the real panel assembly. Figure 2In the illustrated embodiment, the number of the enclosure simulation components 2 is two, and the two enclosure simulation components 2 are arranged in parallel in the height direction of the mounting base 3. It should be noted that the height direction refers to the direction perpendicular to the placement surface of the simulation device. That is, the number of the first unit plate 21, the second unit plate 22, and the third unit plate 23 are two respectively, the two first unit plates 21 are arranged in parallel up and down, the two second unit plates 22 are arranged in parallel up and down, and the two third unit plates 23 are also arranged in parallel up and down. The spacing between the bolts 4 on the two first unit plates 21, the spacing between the bolts 4 on the two second unit plates 22 along the height direction, the spacing between the bolts 4 on the two third unit plates 23 along the height direction, and the horizontal spacing between adjacent bolts 4 on the same unit plate can be set according to the spacing of the bolts 4 on the enclosure assembly of a certain model of the reactor. Thus, a whole enclosure in the real enclosure assembly is split into two enclosure simulation components 2, the structure is flexible, and each unit plate is convenient to replace.

[0048] Furthermore, if Figure 2 In the first embodiment shown, a gap is formed between the two enclosure simulation components 2, that is, a gap is formed between the two first unit plates 21, between the two second unit plates 22, and between the two third unit plates 23. This can reduce the area of ​​the two enclosure simulation components 2 and reduce the overall weight of the simulation device. Alternatively, in other embodiments, the two enclosure simulation components 2 can also be in contact with each other. For example Figure 4 In the third embodiment shown, different from the first embodiment, two enclosure simulation assemblies 2 are closely connected, that is, two first unit boards 21, two second unit boards 22 and two third unit boards 23 are closely connected.

[0049] like Figure 3 and Figure 4 In the illustrated embodiment, a plurality of lifting connectors 5 are provided on the mounting base 3, and the lifting connectors 5 can be used to connect lifting equipment, so as to realize the movement and transportation of the entire simulation device.

[0050] In order to further save costs and reduce weight, except that the materials of each enclosure simulation component 2 and bolt 4 are consistent with the real enclosure component, the materials of other components (such as the mounting base 3, lifting connector 5, etc.) are all made of ordinary stainless steel.

[0051] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A simulation device for the coaming assembly of the lower internals, characterized in that: It comprises a mounting base (3), at least one enclosure simulation component (2), and bolts (4); Each of the enclosure simulation components (2) is arranged on the mounting base (3), and each of the enclosure simulation components (2) comprises a first unit plate (21), a second unit plate (22) and a third unit plate (23); The second unit plate (22) is arranged between the first unit plate (21) and the third unit plate (23), and the first unit plate (21) and the second unit plate (22) are perpendicular to each other, the second unit plate (22) and the third unit plate (23) are perpendicular to each other, the third unit plate (23) and the first unit plate (21) are parallel to each other, and the first unit plate (21), the second unit plate (22) and the third unit plate (23) together enclose a working space; The first unit plate (21), the second unit plate (22) and the third unit plate (23) are respectively provided with a plurality of bolt holes, and the bolts (4) are installed in the bolt holes.

2. The lower internals enclosure assembly simulation device according to claim 1, characterized in that: The mounting base (3) comprises a base (30), a first supporting plate (31) and a second supporting plate (32); The first supporting plate (31) and the second supporting plate (32) are respectively connected to the base (30) and are parallel to each other, and the base (30) is respectively perpendicular to the first supporting plate (31) and the second supporting plate (32); The first unit plate (21) is arranged on the first supporting plate (31), the third unit plate (23) is arranged on the second supporting plate (32), and the second unit plate (22) is arranged on the base (30).

3. The lower internals shroud assembly simulation device according to claim 2, characterized in that: The base (30) is a hollow frame structure.

4. The lower internals enclosure assembly simulation device according to claim 3, characterized in that: The base (30) comprises four upright posts (301), four upper posts (302) and four lower posts (303); The four upper supports (302) and the four lower supports (303) are parallel to each other in a one-to-one correspondence; the four upper supports (302) are connected in sequence to form a rectangular plane, and the four lower supports (303) are also connected in sequence to form a rectangular plane; One end of each of the upright posts (301) is connected between two adjacent upper posts (302), and the other end is connected between two adjacent lower posts (303); The first supporting plate (31) and the second supporting plate (32) are respectively connected to two adjacent columns (301); one end of the second unit plate (22) and the first supporting plate (31) are connected to the same column (301); and the other end of the second unit plate (22) and the second supporting plate (32) are connected to the same column (301).

5. The lower internals shroud assembly simulation device according to claim 4, characterized in that: The base (30) further comprises reinforcing ribs (304), and the reinforcing ribs (304) are connected between at least one of the lower pillars (303) and the upright pillar (301), and between at least one of the upper pillars (302) and the upright pillar (301).

6. The lower internals shroud assembly simulation device according to claim 1, characterized in that: The number of the enclosure simulation components (2) is two, and the two enclosure simulation components (2) are arranged in parallel in the height direction of the mounting base (3).

7. The lower internals shroud assembly simulation device according to claim 6, characterized in that: A gap is formed between the two enclosure simulation components (2).

8. The lower internals shroud assembly simulation device according to claim 1, characterized in that: It also includes a counterweight box connected to the mounting base (3).

9. The lower internals shroud assembly simulation device according to claim 1, characterized in that: The installation base (3) is provided with a lifting connection piece (5).

10. The lower internals shroud assembly simulation device according to claim 1, characterized in that: The length of the second unit plate (22) is greater than the lengths of the first unit plate (21) and the third unit plate (23).

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