Nuclear power plant nuclear sampling glove box shielding device

Abstract

The utility model discloses a nuclear power plant nuclear sampling glove box shielding device, comprising a mounting rack comprising a first support and a second support which are adjacently arranged and are respectively fixedly connected to the ground; each glove box comprises a box body, a plurality of nested frames and a plurality of visual shielding panels, the nested frames are detachably connected with the box bodies in a sealed mode, the box bodies are arranged on the first support, and the nested frames are arranged on the second support; each visual shielding panel is detachably connected with one nesting frame, and each visual shielding panel is provided with a plurality of sampling holes for sampling operation. The weight of the box body is borne by the first support, the weight of the nesting frame is borne by the second support, the nesting frame is stressed, the weight of the visual shielding panel is transferred to the second support, the visual shielding panel is prevented from being broken due to stress, and the service life of the visual shielding panel is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant sampling shielding technology, and in particular to a shielding device for a nuclear sampling glove box in a nuclear power plant. Background Technology

[0002] The nuclear sampling glove box is a device used by power plant chemical personnel to perform chemical sampling on radioactive systems. The samples taken are used to analyze whether the radiochemical indicators meet the operational requirements. Because the sampling medium is a radioactive liquid / gas, the nuclear sampling glove box is required to be a fully enclosed negative pressure chamber structure. Personnel use embedded sampling gloves connected to a transparent panel to reach into the glove box and open the corresponding valves to take samples, in order to avoid the spread of contamination.

[0003] Because the nuclear sampling glove box contains a complex array of numerous radioactive pipelines and valves, and these pipelines are relatively thin, space constraints and weight-bearing limitations make it impossible to implement radioactive shielding. Furthermore, when taking samples, chemical personnel need to observe whether the valves are being operated correctly, whether the sample is being connected to the sampling container, and whether the sampling volume meets requirements. Therefore, the panel must be transparent, and since maintenance of valves and equipment within the glove box is involved, the panel must be detachable.

[0004] Given the above factors, the sampling panels at all nuclear power plants are made of ordinary acrylic glass, offering no shielding effect. As the units operate, radiation sources gradually accumulate, and radiation levels continuously increase. This room is the primary work area for chemical personnel at the nuclear power plant, contributing significantly to the collective dose to chemical sampling personnel. Traditional shielding uses ordinary lead plates or lead sheets, but this type of shielding obstructs visibility, preventing chemical personnel from conducting sampling work. Using lead glass is not feasible due to its brittle and easily cracked nature, and it cannot meet the equipment's load-bearing and support requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a shielding device for a nuclear sampling glove box in a nuclear power plant.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a shielding device for a nuclear sampling glove box in a nuclear power plant, comprising:

[0007] The mounting frame includes a first bracket and a second bracket, which are arranged adjacent to each other and fixedly connected to the ground.

[0008] A plurality of glove boxes, each glove box comprising a box body, a plurality of nested frames and a plurality of visual shielding panels, wherein the nested frames are detachably and sealed to the box body, the box body is disposed on a first support, and the nested frames are disposed on a second support; each visual shielding panel is detachably connected to one of the nested frames, and each visual shielding panel is provided with a plurality of sampling holes for sampling operations.

[0009] In some embodiments, a single glove box further includes a plurality of intermediate baffles, the number of visible shielding panels is at least two, and the number of nested frames is the same as the number of visible shielding panels; the intermediate baffles are disposed between two nested frames and are tightly connected to each of the two nested frames.

[0010] In some embodiments, the nested frame includes a panel outer frame, a sealing frame, and a plurality of connectors. The sealing frame is disposed between the panel outer frame and the housing and is sealed to each other. Each connector is detachably connected to the panel outer frame and the housing, respectively.

[0011] In some embodiments, the nested frame further includes a sealing strip connected to the side of the panel outer frame facing the housing and abutting against the inner side of the sealing frame to enhance the seal.

[0012] In some embodiments, the housing includes a connecting flange and a cylindrical body, wherein the connecting flange is fixedly connected to either end of the cylindrical body;

[0013] The connector is detachably connected to the connecting flange.

[0014] In some embodiments, the connecting flange is provided with a mounting groove with an outer peripheral opening, the connector is a C-shaped structure, the connector abuts against the wall of the mounting groove and the outer frame of the panel, and is detachably connected to the connecting flange and the connector by fasteners.

[0015] In some embodiments, the first support includes a plurality of first columns and a plurality of first support beams, the plurality of first columns are spaced apart, the two ends of the first columns are fixedly connected to the ground and the first support beams respectively, and the first support beams bear the weight of the box.

[0016] In some embodiments, the second support includes a plurality of second columns, a plurality of crossbeams and a plurality of pads, the plurality of second columns are spaced apart, the two ends of the second columns are fixedly connected to the ground and the crossbeams respectively, and the pads are disposed between the crossbeams and the nested frame to compensate for the support height.

[0017] In some embodiments, the upper surface of the pad is sloped and matches the shape of the bottom surface of the nested frame.

[0018] In some embodiments, the system further includes a plurality of swing door shielding structures, which are disposed at the lower part of the glove box and respectively fixedly connected to the second bracket.

[0019] By implementing this utility model, the following beneficial effects can be achieved:

[0020] This utility model discloses a shielding device for nuclear sampling glove boxes in nuclear power plants, comprising: a mounting frame including a first support and a second support, the first support and the second support being adjacent to each other and fixedly connected to the ground; a plurality of glove boxes, each glove box comprising a box body, a plurality of nested frames and a plurality of visible shielding panels, the nested frames being detachably and sealingly connected to the box body, the box body being mounted on the first support, and the nested frames being mounted on the second support; each visible shielding panel being detachably connected to one of the nested frames, and each visible shielding panel having a plurality of sampling holes for sampling operations. This utility model uses the first support to bear the weight of the box body and the second support to bear the weight of the nested frames. When the nested frames are stressed, the weight of the visible shielding panels is transferred to the second support, preventing the visible shielding panels from breaking under stress and increasing their service life. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a nuclear power plant nuclear sampling glove box shielding device according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the mounting bracket in the diagram;

[0024] Figure 3 yes Figure 1 One of the structural diagrams of the glove box in the image shows a horizontally adjacent structure.

[0025] Figure 4 yes Figure 1 The second structural diagram of the glove box in the diagram shows a vertically stacked structure.

[0026] Figure 5 yes Figure 3 One of the installation diagrams of the glove box in the image, specifically a partial sectional view of the glove box;

[0027] Figure 6 yes Figure 3 The second installation diagram of the glove box is shown in the top view of the middle retaining strip position.

[0028] Figure 7 yes Figure 1A schematic diagram of the structure of the box in the middle;

[0029] Figure 8 yes Figure 2 A partial structural diagram of the first support in the diagram;

[0030] Figure 9 yes Figure 2 A partial structural diagram of the second support in the diagram;

[0031] Figure 10 yes Figure 9 A schematic diagram of the structure of the pad block in the diagram;

[0032] Figure 11 yes Figure 1 A schematic diagram of the installation of the swing door shielding structure. Detailed Implementation

[0033] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] See Figures 1 to 11 One embodiment of this utility model discloses a shielding device for a nuclear sampling glove box in a nuclear power plant, including a mounting frame 1, several glove boxes 2, and several swing-door shielding structures 3. The mounting frame 1 is used to install and support the glove boxes 2 and the swing-door shielding structures 3. The glove boxes 2 are used by personnel to insert their hands into the glove boxes 2 to open corresponding valves for sampling. The swing-door shielding structures 3 are used to expand the radiation shielding range, effectively shielding the lower sampling pipelines and further reducing the radiation level in the nuclear sampling room. The number of glove boxes 2 is set according to actual needs, such as four or five. Similarly, the number of swing-door shielding structures 3 is set according to actual needs, such as four or five. This utility model is not limited herein. For ease of description, definitions are provided. Figure 1 The orientation in the figure is the orientation of this utility model.

[0038] like Figure 2 As shown, the mounting frame 1 includes a first bracket 11 and a second bracket 12, which are arranged adjacently and fixedly connected to the ground. The first bracket 11 and the second bracket 12 are arranged front-to-back, and together they support the glove box 2 and the swing-door shielding structure 3. The lateral length of the first bracket 11 and the second bracket 12 is set according to actual needs. The ground can be the floor of the room where the nuclear power plant nuclear sampling glove box shielding device is to be installed, and the nuclear power plant nuclear sampling glove box shielding device is installed on-site. Understandably, the first bracket 11 and the second bracket 12 can also be installed on other structures, such as steel plates, so that the nuclear power plant nuclear sampling glove box shielding device can be installed externally as a whole and then easily transported to the room.

[0039] Several glove boxes 2 are arranged horizontally in sequence, and their total horizontal length is less than or equal to the minimum horizontal length of the first support 11 and the second support 12. For example... Figure 3 or Figure 4As shown, each glove box 2 includes a box body 21, several nested frames 22, and several visible shielding panels 23. The nested frames 22 are detachably and sealingly connected to the box body 21. The box body 21 is mounted on a first support 11, and the nested frames 22 are mounted on a second support 12. Each visible shielding panel 23 is detachably connected to one nested frame 22, and each visible shielding panel 23 is provided with several sampling holes 231 for sampling operations. The nested frames 22 support the visible shielding panels 23, preventing them from breaking under direct force when clamping. The nested frames 22 are detachably mounted from the box body 21, allowing for modular disassembly and replacement of the entire nested frame 22 and visible shielding panels 23. The number of nested frames 22 can be set according to the number of visible shielding panels 23. For example, if there is one visible shielding panel 23, then one nested frame 22 is used; if there are two visible shielding panels 23, then two nested frames 22 are used, and so on. The visual shielding panel 23 serves both visual and radiation shielding functions, allowing personnel to observe whether the valves are being operated correctly, whether the sample is being placed into the sampling container, and whether the sampling volume meets requirements during sampling. Preferably, the visual shielding panel 23 is made of transparent glass, such as inorganic lead glass ZF6 with a density of 4.77 g / cm³. The housing 21 and the nesting frame 22 can both be made of stainless steel.

[0040] like Figure 5 As shown, in some embodiments, a single glove box 2 further includes several intermediate baffles 24, and the number of visible shielding panels 23 is at least two. The number of nested frames 22 is the same as the number of visible shielding panels 23. The intermediate baffles 24 are positioned between two nested frames 22 and are tightly connected to each of the two nested frames 22. Considering the weight of a single visible shielding panel 23, disassembling the visible shielding panel 23 within a single glove box 2 into several pieces can reduce the weight of a single visible shielding panel 23, facilitating manual loading and unloading. The intermediate baffles 24 are used for the tight fit of the two nested frames 22, providing installation positioning and facilitating subsequent disassembly and replacement. Figure 3 As shown, the two visual shielding panels 23 can be horizontally adjacent, with the intermediate baffle 24 vertically positioned. Figure 4 As shown, the two visible shielding panels 23 can be stacked vertically, and the middle baffle 24 is set horizontally.

[0041] like Figure 6As shown, in some embodiments, the nested frame 22 includes a panel outer frame 221, a sealing frame 222, and multiple connectors 223. The sealing frame 222 is disposed between the panel outer frame 221 and the housing 21 and is mutually sealed. Each connector 223 is detachably connected to both the panel outer frame 221 and the housing 21. The panel outer frame 221 is used to install the visual shielding panel 23, and the visual shielding panel 23 is no longer under stress. The panel outer frame 221 protects the visual shielding panel 23 and reduces the risk of breakage. For example, the panel outer frame 221 has an internal slot for the visual shielding panel 23 to be inserted, with a small gap between the visual shielding panel 23 and the wall of the internal slot. Several gaskets can be provided on the side of the nested frame 22 away from the housing 21. These gaskets are placed between the connectors 223 and the panel outer frame 221 to increase connection stability. The sealing frame 222 has the same surface shape as the panel outer frame 221 facing the housing 21.

[0042] In some embodiments, the nested frame 22 further includes a sealing strip 224, which is connected to the side of the panel outer frame 221 facing the housing 21 and abuts against the inner side of the sealing frame 222 to enhance the seal and prevent nuclear radiation leakage. Simultaneously, the sealing strip 224 abuts against the inner wall of the housing 21, which also enables installation positioning.

[0043] like Figure 7 As shown, in some embodiments, the housing 21 includes a connecting flange 211 and a cylindrical body 212, with the connecting flange 211 fixedly connected to either end of the cylindrical body 212. The connector 223 is detachably connected to the connecting flange 211.

[0044] See you together Figure 6 In some embodiments, the connecting flange 211 is provided with a mounting groove 213 with an outer peripheral opening, and the connector 223 has a C-shaped structure. The connector 223 abuts against the wall of the mounting groove 213 and the outer frame of the panel 221, and is detachably connected to the connecting flange 211 and the connector 223 by fasteners.

[0045] like Figure 8 As shown, in some embodiments, the first support 11 includes a plurality of first columns 111 and a plurality of first support beams 112. The plurality of first columns 111 are spaced apart, and the two ends of the first columns 111 are fixedly connected to the foundation and the first support beams 112, respectively. The first support beams 112 bear the weight of the box body 21. The first columns 111 and the first support beams 112 are vertically connected. The number of first support beams 112 is based on the ability to support the weight of the box body 21, and is not limited in this utility model. For example, two or three first support beams 112 are correspondingly arranged at the bottom of a box body 21. The two or three first support beams 112 can be arranged parallel to each other, partially parallel and partially perpendicular, or partially or completely at an angle.

[0046] like Figure 9 As shown, in some embodiments, the second support 12 includes several second columns 121, several crossbeams 122, and several pads 123. The second columns 121 are spaced apart, and their two ends are fixedly connected to the foundation and the crossbeams 122, respectively. The pads 123 are placed between the crossbeams 122 and the nested frame 22 to compensate for the support height. A gap is left between adjacent pads 123 to avoid the connectors 223. The thickness of the pads 123 is determined by the distance between the crossbeams 122 and the nested frame 22. The crossbeams 122 are used to support the weight of the nested frame 22 and the visual shielding panel 23. The number of second columns 121, crossbeams 122, and pads 123 is based on the ability to support the weight, and this invention does not impose any limitations. For example, one housing 21 may have two second columns 121, one crossbeam 122, and six pads 123. This design has a simple structure, high load-bearing capacity, and is easy to install. On the one hand, the weight of the nested frame 22 and the visual shielding panel 23 is directly borne vertically by the second bracket 12, reducing the overall difficulty of fixing the nested frame 22 and the visual shielding panel 23 and reducing safety risks. On the other hand, it solves the problem of the order of installation of the connector 223 and the nested frame 22, avoiding repeated adjustments that increase installation complexity.

[0047] like Figure 10 As shown, in some embodiments, the upper surface of the pad 123 is inclined and matches the shape of the bottom surface of the nested frame 22. This is used to support the weight of the nested frame 22 and the visual shielding panel 23. Preferably, the pad 123 is a wedge.

[0048] like Figure 11 As shown, in some embodiments, a plurality of swing-door shielding structures 3 are also included. These swing-door shielding structures 3 are located at the lower part of the glove box 2 and are respectively fixedly connected to the second support 12. The swing-door shielding structures 3 are used to expand the radiation shielding range, effectively shielding the lower sampling pipeline and further reducing the radiation level of the nuclear sampling room. The swing-door shielding structures 3 are connected to the second columns 121 on both sides via hinges welded to them. The interior of the swing-door shielding structure 3 uses rectangular tubing as the support body, with lead plates and stainless steel skin on both sides. To ensure structural strength, the edges are framed with stainless steel. A steel plate is designed at the bottom for leveling, facilitating the opening of the swing doors. To further ensure the shielding effect, gaps may easily exist between the swing-door shielding structure 3 and the glove box 2, or between the swing-door shielding structure 3 and the second support 12, such as the crossbeam 122. These gaps can be covered by installing shielding strips 4 to enhance the shielding effect.

[0049] The method of using this utility model is as follows:

[0050] To facilitate on-site installation and ensure smooth transport routes, and to minimize installation time for personnel, the nuclear power plant's nuclear sampling glove box shielding device was primarily transported to the site in component form. The specific steps are as follows:

[0051] (1) Position and install the first bracket 11 and the second bracket 12. Fix the first column 111 and the second column 121 to the ground with anchor bolts, and then install the first support beam 112.

[0052] (2) Place the shielding strip 4 in the designated position.

[0053] (3) Install the swing door shielding structure 3 and fix it to the second column 121, and install the box 21 and fix it to the first support beam 112.

[0054] (4) Install the crossbeam 122 and the pad 123. Insert the bolts into the connection between the column and the crossbeam 122. No need to tighten them.

[0055] (5) The first set of nested frames 22, which has been fixed to the visual shielding panel 23 in advance, is placed in the designated position of the box 21. Then, the distance between the crossbeam 122 and the nested frame 22 is adjusted by adjusting the distance between the crossbeam 122 and the second column 121 and by adding a shim at the bottom of the crossbeam 122 to ensure that the shim 123 and the nested frame 22 are completely fitted together. Finally, the nested frame 22 is fixedly connected to the box 21 by fasteners such as bolts using the connector 223.

[0056] (6) Insert the middle baffle 24 into the designated position and clamp it with the connector 223. There is no need to tighten the bolts. Then, place the second set of nested frames 22, which has been fixed to the visual shielding panel 23 in advance, into the designated position of the box 21. Then, adjust the distance between the crossbeam 122 and the nested frame 22 by adjusting the distance between the crossbeam 122 and the second column 121 and by adding a shim at the bottom of the crossbeam 122 to ensure that the shim 123 and the nested frame 22 are completely fitted together. Finally, use the connector 223 to fix the nested frame 22 to the box 21 with bolts and other fasteners.

[0057] The installation of one glove box 2 can be completed by following the steps (1) to (6) above. The installation of other glove boxes 2 is carried out by repeating steps 4 to 6 in the same way, which will not be described in detail here.

[0058] This utility model's nuclear power plant nuclear sampling glove box shielding device achieves non-interference between sampling and shielding, meets seismic and mechanical requirements, and solves the radiation resistance and aging resistance problems of lead glass materials. It also solves the problem of chemical sampling personnel being unable to effectively shield themselves from high-dose radiation. After installation, the average on-site radiation level is reduced by more than 50%, reducing the collective radiation dose by 5.5 mSv annually, with a total benefit of 220 mSv over the unit's lifespan.

[0059] By implementing this utility model, the following beneficial effects can be achieved:

[0060] The shielding device for nuclear sampling glove box in nuclear power plants of this utility model uses a first support 11 to support the weight of the box body 21 and a second support 12 to support the weight of the nested frame 22. When the nested frame 22 is under stress, the weight of the visible shielding panel 23 is transferred to the second support 12, which avoids the visible shielding panel 23 from breaking under stress and increases the service life of the visible shielding panel 23.

[0061] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model. That is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A nuclear plant nuclear sampling glove box shielding apparatus, characterized by, include: The mounting bracket (1) includes a first bracket (11) and a second bracket (12), wherein the first bracket (11) and the second bracket (12) are arranged adjacent to each other and are respectively fixedly connected to the ground; A plurality of glove boxes (2), each glove box (2) including a box body (21), a plurality of nested frames (22) and a plurality of visual shielding panels (23), wherein the nested frames (22) are detachably and sealed to the box body (21), the box body (21) is disposed on the first support (11), and the nested frames (22) are disposed on the second support (12); each of the visual shielding panels (23) is detachably connected to one of the nested frames (22), and each of the visual shielding panels (23) is provided with a plurality of sampling holes (231) for sampling operations.

2. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 1, wherein, Each glove box (2) also includes several intermediate baffles (24), the number of visual shielding panels (23) is at least two, the number of nested frames (22) is the same as the number of visual shielding panels (23); the intermediate baffles (24) are located between two nested frames (22) and are tightly connected to the two nested frames (22) respectively.

3. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 2, wherein, The nested frame (22) includes a panel outer frame (221), a sealing frame (222) and a plurality of connectors (223). The sealing frame (222) is disposed between the panel outer frame (221) and the box body (21) and is sealed to each other. Each connector (223) is detachably connected to the panel outer frame (221) and the box body (21).

4. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 3, wherein, The nested frame (22) also includes a sealing strip (224), which is connected to the side of the panel frame (221) facing the housing (21) and abuts against the inner side of the sealing frame (222) to enhance the seal.

5. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 3, wherein, The housing (21) includes a connecting flange (211) and a cylindrical body (212), wherein the connecting flange (211) is fixedly connected to either end of the cylindrical body (212); The connector (223) is detachably connected to the connecting flange (211).

6. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 5, wherein, The connecting flange (211) is provided with an outer peripheral opening mounting groove (213), the connector (223) is a C-shaped structure, the connector (223) abuts against the wall of the mounting groove (213) and the outer frame of the panel (221), and is detachably connected to the connecting flange (211) and the connector (223) by fasteners.

7. The nuclear power plant nuclear sampling glove box shielding apparatus according to any one of claims 1-6, wherein, The first support (11) includes a plurality of first columns (111) and a plurality of first support beams (112). The plurality of first columns (111) are spaced apart. The two ends of the first columns (111) are fixedly connected to the ground and the first support beams (112) respectively. The first support beams (112) bear the weight of the box (21).

8. The nuclear power plant nuclear sampling glove box shielding apparatus according to any one of claims 1-6, wherein, The second support (12) includes several second columns (121), several crossbeams (122) and several pads (123). The several second columns (121) are spaced apart. The two ends of the second columns (121) are fixedly connected to the ground and the crossbeams (122) respectively. The pads (123) are placed between the crossbeams (122) and the nested frame (22) to compensate for the support height.

9. The nuclear power plant nuclear sampling glove box shielding apparatus of claim 8, wherein, The upper surface of the pad (123) is inclined and matches the shape of the bottom surface of the nested frame (22).

10. The nuclear plant nuclear sampling glove box shielding apparatus according to any one of claims 1-6, wherein, It also includes several swing door shielding structures (3), which are located at the lower part of the glove box (2) and are respectively fixedly connected to the second bracket (12).

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