Modular combined shielding device

Abstract

The application discloses a modular combined shielding device, which comprises a terminal frame body, an intermediate frame body, an L-shaped corner frame body, a T-shaped middle frame body, a single-head fixed support, a double-head fixed support and a shielding module, wherein the shielding module is connected and fixed with the intermediate frame body, the L-shaped corner frame body, the T-shaped middle frame body, the single-head fixed support and the double-head fixed support through buckles. The shielding device has the advantages that: first, the shielding device has strong shielding performance and can effectively shield high-level radioactive hot spot equipment, and the shielding device can avoid the problem of radiation leakage; second, the shielding device has reliable safety and stability, the shielding device does not contact the hot spot equipment, the hot spot equipment is not damaged by weight, and the shielding device meets the corresponding anti-seismic requirements and stability requirements of a nuclear power plant; and third, the shielding device has strong convenience and is easy to operate, and meets the operation requirements of rapid installation and removal operations.

Description

Technical Field

[0001] This invention belongs to the field of nuclear facility radiation protection technology, specifically relating to a modular combined shielding device that can be used as a radiation shielding device for radioactive waste cement drums and metal drums in nuclear power plant radioactive solid waste binning stations. Background Technology

[0002] The radioactive waste drumming station at a pressurized water reactor nuclear power plant is part of the solid waste treatment system. Its main function is to temporarily store cement-solidified radioactive waste resin, filter elements, and concentrates. Radioactive metal drums and cement drums that have been solidified and fixed need to be temporarily stored at the radioactive waste drumming station before being transferred to the waste storage facility.

[0003] Because cement drums and metal drums contain high levels of waste, especially after the technical upgrades to solid waste treatment systems, the original method of using scaffolding and soft lead shielding is no longer effective in achieving the desired shielding effect. The main reasons are:

[0004] Using steel drums to hold radioactive waste resin and concentrated liquid reduces the shielding effect.

[0005] Single or double-layer soft lead screens often cannot meet the on-site shielding requirements, and hanging more soft lead screens makes it difficult to effectively assess the load-bearing capacity and stability of the scaffolding support, posing a safety hazard.

[0006] After being suspended for a long time, soft lead screens will shrink and deform, resulting in larger gaps between the soft lead screens and a decrease in shielding performance.

[0007] These factors lead to an increase in the ambient dose rate at the drum filling station, increasing the radiation dose to operators and frequently causing radiation monitoring systems in the vicinity to trigger alarms exceeding thresholds. Therefore, there is an urgent need to improve existing shielding methods to achieve good shielding performance while also ensuring good safety, operability, and aesthetics. However, currently, there are no suitable temporary shielding devices, either domestically or internationally, that can meet these comprehensive requirements.

[0008] To effectively address the shielding challenges of radioactive hotspot equipment in nuclear power plants and to better utilize radiation shielding facilities, it is essential to design and manufacture a radiation shielding device that meets radiation protection requirements in terms of shielding performance, possesses strong safety and stability, and can significantly reduce the radiation dose received by workers, based on the need for optimal management of power plant radiation protection. Summary of the Invention

[0009] The purpose of this invention is to provide a modular combined shielding device that can solve the problem of fixed shielding measures for cement barrels and metal barrels with high dose rates in nuclear power plant radioactive solid waste binning stations.

[0010] The technical solution of the present invention is as follows: A modular combined shielding device includes an end frame, a middle frame, an L-shaped corner frame, a T-shaped middle frame, a single-head fixed bracket, a double-head fixed bracket, and a shielding module. The shielding module is connected and fixed to the middle frame, the L-shaped corner frame, the T-shaped middle frame, the single-head fixed bracket, and the double-head fixed bracket by means of snap fasteners.

[0011] The end frame includes a frame column, a base, L-shaped hooks, a clamping buckle, a rubber pad, a reinforcing rib support, and a П-shaped connector. A clamping buckle is installed at one end of the frame column, and a base is installed at the other end of the frame column. A reinforcing rib support is provided between the frame column and the base. A П-shaped connector is provided at the bottom of the base. Multiple L-shaped hooks are provided on one side of the frame column, and a rubber pad is provided on one side of the frame column.

[0012] The single-head fixed bracket includes a snap fastener, a handle, a bolt, a rubber buffer pad, a base, a square buffer pad, a frame, and a connector. One end of the frame is provided with a snap fastener, and the other end is provided with a base connected by the connector. The connector includes a rotating pin and a nut. The base is provided with a square buffer pad, and the frame is provided with multiple bolts. One side of the bolt is provided with a handle, and the other side is provided with a rubber buffer pad.

[0013] The intermediate frame includes an L-shaped hook, a rubber pad, a base, a P-shaped connector, a clamping buckle, an upright, and a reinforcing rib support. One end of the upright is equipped with a clamping buckle, and the other end is equipped with the base. A reinforcing rib support is provided between the upright and the base. The P-shaped connector is installed on the base, and a rubber pad is provided on the upright.

[0014] The double-headed fixing bracket includes a bracket body, a top module with two parallel snap fasteners, a top module mounted on the top of the bracket body, and a top module support between the bracket body and the top module. The other structural features of the bracket body are the same as those of the single-headed fixing bracket.

[0015] The L-shaped corner frame includes a corner frame clamping buckle, a corner frame rubber pad, a corner frame upright, a corner frame P-shaped connector, a corner frame L-shaped hook, a corner frame reinforcing rib support, and a corner frame base. One end of the corner frame upright is provided with a corner frame clamping buckle, and the other end is provided with a corner frame base. A corner frame reinforcing rib support is provided between the corner frame upright and the corner frame base. A corner frame P-shaped connector is provided on the corner frame base. The corner frame upright is also provided with a corner frame L-shaped hook and a corner frame rubber pad.

[0016] The T-shaped central frame includes a T-shaped frame L-shaped hook, a T-shaped frame rubber pad, a T-shaped frame base, a T-shaped frame first column, a T-shaped frame second column, a T-shaped frame P-shaped connector, a T-shaped frame clamping buckle, and a T-shaped frame reinforcing rib support. The T-shaped frame first column and T-shaped frame second column are mounted on the T-shaped frame base, which is equipped with a T-shaped frame P-shaped connector. Both the T-shaped frame first column and T-shaped frame second column are connected to the T-shaped frame base with T-shaped frame reinforcing rib support. The top of both the T-shaped frame first column and T-shaped frame second column is equipped with a T-shaped frame clamping buckle. The T-shaped frame first column and T-shaped frame second column are also equipped with a T-shaped frame L-shaped hook and a T-shaped frame rubber pad.

[0017] The shielding module includes a shielding module body, a folding handle, a dovetail structure, and an L-shaped hook. The shielding module body is equipped with a folding handle and an L-shaped hook, and the edge of the shielding module body has a dovetail structure. The shielding module is internally made of lead and externally encased in stainless steel.

[0018] The beneficial effects of this invention are as follows: First, it possesses strong shielding performance, effectively shielding high-level radioactive hotspot equipment while preventing radiation leakage from the shielding device; second, it offers reliable safety and stability, as the shielding device does not contact the hotspot equipment, preventing damage from excessive weight, and simultaneously meeting the seismic and stability requirements of nuclear power plants; third, it is highly convenient and easy to operate, meeting the operational requirements for rapid installation and removal; fourth, it has a certain degree of versatility, allowing the shielding device to be combined into different shapes according to the location and structure of the hotspot, and multiple sets of devices can be combined to expand the shielding coverage, achieving the universal requirement of overall shielding for hotspots of various locations and types.

[0019] The modular combined shielding device described in this invention has strong stability and safety, and the combined shielding body can meet the stability requirements of a magnitude 9 earthquake. Compared to shielding erection methods using scaffolding for support of the same scale, the workload and operation time of the modular combined shielding device described in this invention are significantly reduced during erection and dismantling. The shielding thickness of the modular combined shielding device described in this invention is approximately equivalent to the thickness of a 6-layer soft lead shield commonly used in power plants, making it easy to install and preventing deformation. It offers good operational convenience, strong stability, and shielding performance that is more than 6 times better than scaffolding shielding methods. The modular combined shielding device described in this invention can be used individually or in combination, achieving overall shielding requirements for various types of hotspot areas without affecting system functionality. Attached Figure Description

[0020] Figure 1This is an overall assembly drawing of the modular combined shielding device of type ш for its usage.

[0021] Figure 2 for Figure 1 The main view;

[0022] Figure 3 This is the front view of the end frame;

[0023] Figure 4 for Figure 3 Top view;

[0024] Figure 5 for Figure 3 The left view;

[0025] Figure 6 This is the front view of a single-head fixed bracket;

[0026] Figure 7 for Figure 6 Top view;

[0027] Figure 8 Assembly diagram of the end frame and single-head fixed bracket;

[0028] Figure 9 This is the main view of the intermediate frame;

[0029] Figure 10 for Figure 9 Top view;

[0030] Figure 11 for Figure 9 The left view;

[0031] Figure 12 This is a schematic diagram of a double-headed fixing bracket;

[0032] Figure 13 Assembly drawing of the intermediate frame and the double-headed fixed bracket;

[0033] Figure 14 for Figure 13 Top view;

[0034] Figure 15 This is the front view of the L-shaped corner frame.

[0035] Figure 16 for Figure 15 The left view;

[0036] Figure 17 Assembly drawing of L-shaped corner frame and single-head fixed bracket;

[0037] Figure 18 This is the main view of the T-shaped central frame.

[0038] Figure 19 for Figure 18 Top view;

[0039] Figure 20 for Figure 18 The left view;

[0040] Figure 21 Assembly drawing of the T-shaped middle frame and single-head fixed bracket;

[0041] Figure 22 To hide the main view of the module;

[0042] Figure 23 for Figure 22 Top view;

[0043] Figure 24 for Figure 22 The left view;

[0044] Figure 25 This is a diagram showing the assembly and installation of the shielding module with the frame (end and middle frames);

[0045] Figure 26 This is a schematic diagram of a linear composite structure.

[0046] Figure 27 This is a schematic diagram of an L-shaped assembly.

[0047] Figure 28 This is a schematic diagram of a П-type assembly.

[0048] In the diagram, 1 is the end frame, 2 is the intermediate frame, 3 is the L-shaped corner bracket, 4 is the T-shaped middle frame, 5 is the single-head fixed bracket, 6 is the double-head fixed bracket, 7 is the shielding module, 11 is the frame column, 12 is the base, 13 is the frame L-shaped hook, 14 is the clamping buckle, 15 is the rubber pad, 16 is the reinforcing rib support, 17 is the П-shaped connector, 21 is the intermediate frame L-shaped hook, 22 is the rubber pad, 23 is the intermediate frame base, 24 is the intermediate frame П-shaped connector, 25 is the clamping buckle, 26 is the intermediate frame column, 27 is the intermediate frame reinforcing rib support, 31 is the corner frame clamping buckle, 32 is the corner frame rubber pad, 33 is the corner frame column, 34 is the corner frame П-shaped connector, 35 is the corner frame П-shaped connector, 35 is the corner frame П-shaped connector. 36. Corner frame L-shaped hook, 37. Corner frame reinforcing rib support, 48. Corner frame base, 49. T-type frame L-shaped hook, 40. T-type frame rubber pad, 41. T-type frame base, 42. T-type frame first column, 43. T-type frame second column, 44. T-type frame P-type connector, 45. T-type frame clamping buckle, 46. T-type frame reinforcing rib support, 57. Buckle, 58. Handle, 59. Bolt, 50. Rubber buffer pad, 51. Base, 52. Square buffer pad, 53. Frame, 54. Connector, 65. Top module, 66. Top module support, 77. Shielding module body, 78. Folding handle, 79. Dovetail structure, 70. Shielding module L-shaped hook. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] The present invention provides a modular combined shielding device that solves the application problem of fixed shielding measures for cement barrels and metal barrels with high dose rates in nuclear power plant radioactive solid waste binning stations. At the same time, the shielding device has strong advantages over other shielding methods in terms of safety performance, stability performance, convenience performance and reduction of radiation dose to workers.

[0051] like Figure 1 As shown, a modular combined shielding device includes an end frame 1, a middle frame 2, an L-shaped corner frame 3, a T-shaped middle frame 4, a single-head fixed bracket 5, a double-head fixed bracket 6, and shielding modules 7. The shielding modules are connected and fixed to the various frames via snap-fit ​​fasteners, and the shielding modules are connected by a dovetail structure. The bottom of the single-head and double-head fixed brackets is connected to each frame via rotating pins and nuts, and the top is locked and fixed to each frame via snap-fit ​​fasteners. The shielding modules are pressed and fixed between the frames and the brackets. The modular combined shielding device can select the appropriate number of components and materials according to different construction structures.

[0052] like Figure 3-5 As shown, the end frame 1 includes a frame column 11, a base 12, a frame L-shaped hook 13, a clamping buckle 14, a rubber pad 15, a reinforcing rib support 16, and a П-shaped connector 17. The clamping buckle 14 is installed at one end of the frame column 11, and the base 12 is installed at the other end of the frame column 11. A reinforcing rib support 16 is provided between the frame column 11 and the base 12. The bottom of the base 12 is provided with a П-shaped connector 17. Multiple frame L-shaped hooks 13 are provided on one side of the frame column 11, and a rubber pad 15 is provided on one side of the frame column 11.

[0053] The specific end frame 1 is an integrated structure made of 45 steel. The base dimensions are: 345mm long, 300mm wide, and 8mm thick. A vertical column is nested in the middle of the base and welded in place. The column is 80mm long, 43mm wide, and 1500mm high. A П-shaped connector is welded to the base 43mm away from one side of the column. A 5mm thick rubber pad is installed on the side of the column opposite the П-shaped connector. Two reinforcing ribs are welded in parallel to the base on the side of the column without the rubber pad. A clamping buckle is welded to the top of the side of the column with the rubber pad. L-shaped hooks are welded to the two left and right sides of the column. Eight L-shaped hooks are welded to the left end frame on the left column opposite the rubber pad, and eight L-shaped hooks are welded to the right end frame on the right column opposite the rubber pad.

[0054] like Figure 6-7As shown, the single-head fixed bracket 5 includes a snap fastener 51, a handle 52, a bolt 53, a rubber buffer pad 54, a base 55, a square buffer pad 56, a frame 57, and a connector 58. One end of the frame 57 is provided with a snap fastener 51, and the other end is provided with a base 55 connected to it via the connector 58. The connector 58 includes a rotating pin and a nut. The single-head base 55 is provided with a square buffer pad 56, and the frame 57 is provided with multiple bolts 53. One side of the bolt 53 is provided with a handle 52, and the other side is provided with a rubber buffer pad 54.

[0055] The single-head fixing bracket is a one-piece structure made of 45 steel, with dimensions of 80mm long, 43mm wide, and 1490mm high. The base has a φ12mm through hole, and seven clamping components are evenly installed in the middle. Each clamping component consists of a bolt, a handle, and an 80mm diameter rubber buffer pad. A standard 431MSS snap fastener is welded to the top. The through hole in the base of the single-head fixing bracket allows the П-type connectors of each bracket to be inserted and secured by rotating pins and nuts. The upper snap fastener can be installed and secured with the clamping buckles on the top of each bracket. The single-head fixing bracket can be assembled into a single unit with end brackets, L-shaped corner brackets, and T-shaped middle brackets.

[0056] like Figure 8 The diagram shown is an assembly diagram of the end frame and the single-head fixed bracket.

[0057] like Figure 9-11 As shown, the intermediate frame 2 includes an L-shaped hook 21, a rubber pad 22, a base 23, a P-shaped connector 24, a clamping buckle 25, an upright column 26, and a reinforcing rib support 27. One end of the upright column 26 is provided with a clamping buckle 25, and the other end is provided with the base 23. The reinforcing rib support 27 is provided between the upright column 26 and the base 23. The P-shaped connector 24 is installed on the base 23, and the rubber pad 22 is provided on the upright column 26.

[0058] The intermediate frame is a one-piece structure made of 45 steel. The base dimensions are 345mm long, 300mm wide, and 8mm thick. A vertical column is nested in the center of the base and welded in place. The column is 180mm long, 38mm wide, and 1500mm high. A П-shaped connector is welded to the base 43mm from the side of the column. A 5mm thick rubber pad is installed on the side of the column opposite the П-shaped connector. Eight L-shaped hooks are welded to each of the two sides of the column. Two reinforcing ribs are welded in parallel to the base on the side of the column without rubber pads. Two clamping buckles are welded in parallel to the top of the side of the column with rubber pads.

[0059] like Figure 12As shown, the double-headed fixing bracket includes a bracket body, a top module 61 mounted on the top of the bracket body, and a top module support 62 between the bracket body and the top module 61. The other structures of the bracket body are the same as those of the single-headed fixing bracket.

[0060] The double-headed fixing bracket is a one-piece structure made of 45 steel, with dimensions of 80mm long, 43mm wide, and 1490mm high. The base has a φ12mm through hole, and seven clamping components are evenly installed in the middle. The top is widened to 180mm and equipped with support and fixation, with two 431MSS standard clamping parts welded in parallel. The double-headed fixing bracket can be assembled with the intermediate frame as a single unit. The through hole in the base of the double-headed fixing bracket can be inserted into the П-shaped connector of the intermediate frame and fixed by a rotating pin and nut. The upper clamping buckle can be locked and fixed with the clamping buckle at the top of the intermediate frame.

[0061] like Figure 13-14 The diagram shows the assembly of the intermediate frame and the double-headed fixed bracket.

[0062] like Figure 15-16 As shown, the L-shaped corner frame 3 includes a corner frame clamping buckle 31, a corner frame rubber pad 32, a corner frame upright 33, a corner frame P-shaped connector 34, a corner frame L-shaped hook 35, a corner frame reinforcing rib support 36, and a corner frame base 37. One end of the corner frame upright 33 is provided with a corner frame clamping buckle 31, and the other end is provided with a corner frame base 37. A corner frame reinforcing rib support 36 is provided between the corner frame upright 33 and the corner frame base 37. A corner frame P-shaped connector 34 is provided on the corner frame base 37. The corner frame upright 33 is also provided with a corner frame L-shaped hook 35 and a corner frame rubber pad 32.

[0063] The L-shaped corner frame 3 is a one-piece structure made of 45 steel. The base dimensions are: 320mm long, 300mm wide, and 8mm thick. A vertical column is nested in the center of the base and welded in place. The column is 90mm long, 60mm wide, and 1500mm high. A П-shaped connector is welded to each side of the base 43mm from the adjacent side of the column. 5mm thick rubber pads are installed on both sides of the column opposite the П-shaped connectors. Eight L-shaped hooks are welded to each side of the column without rubber pads, and a reinforcing rib is welded to the base for fixation. A clamping buckle is welded to the top of each of the two sides of the column with rubber pads.

[0064] like Figure 17 The diagram shows the assembly of the L-shaped corner frame and the single-head fixed bracket.

[0065] like Figure 18As shown, the T-shaped central frame 4 includes a T-shaped frame L-shaped hook 41, a T-shaped frame rubber pad 42, a T-shaped frame base 43, a T-shaped frame first upright 44, a T-shaped frame second upright 45, a T-shaped frame P-shaped connector 46, a T-shaped frame clamping buckle 47, and a T-shaped frame reinforcing rib support 48. The T-shaped frame first upright 44 and T-shaped frame second upright 45 are mounted on the T-shaped frame base 43. The bottom of the T-shaped frame base 43... The unit is equipped with a T-shaped frame and a P-shaped connector 46. The first upright column 44 and the second upright column 45 of the T-shaped frame are provided with T-shaped frame reinforcing rib support members 48 between them and the T-shaped frame base 43. The top of the first upright column 44 and the second upright column 45 of the T-shaped frame are provided with T-shaped frame clamping buckles 47. The first upright column 44 and the second upright column 45 of the T-shaped frame are also provided with T-shaped frame L-shaped hooks 41 and T-shaped frame rubber pads 42.

[0066] The T-shaped central frame 4 is an integrated structure made of 45 steel. The base dimensions are: 420mm long, 350mm wide, and 8mm thick. Two uprights are vertically nested in the middle of the base and welded in place. The second upright is 90mm long, 60mm wide, and 1500mm high, while the first upright is 60mm long, 40mm wide, and 1500mm high. The width side of the second upright is aligned with the length side of the first upright, and the distance between the two uprights is 50mm. A П-shaped connector is welded to the base at a distance of 43mm from the width side of the second column and the length side of the first column. A 5mm thick rubber pad is installed on the width side of the second column facing the П-shaped connector and the length side of the first column facing the П-shaped connector. A 5mm thick rubber pad is also installed on the opposite sides of the first and second columns. Eight L-shaped hooks are welded to each of the two sides of the first and second columns without rubber pads, and a reinforcing rib is welded to each side to fix it to the base. A clamping buckle is welded to the top of the width side of the second column with rubber pads and the length side of the first column with rubber pads.

[0067] The П-type connector is made of 45 steel. The connector is 96mm long, 70mm wide, 70mm high, and 8mm thick. Each of the two arms of the connector has a 42mm×12mm through hole. The П-type connector is welded to the base of each frame to form an integral unit.

[0068] The L-shaped hanging ears of the frame are made of 45 steel. The L-shaped hanging ears are 60mm long, 30mm wide, 30mm high, and 5mm thick. The distance between two adjacent hanging ears is 172mm. The L-shaped hanging ears are welded to each frame column to form an integral unit.

[0069] The column reinforcing rib support is made of 45 steel. The support is 60mm long, 10mm wide, and 260mm high. The support is welded between each column and the base to form a triangular support structure, which increases the stability of the column.

[0070] The clamping head is made of 304 stainless steel and is a purchased standard part of model 431MSS. It is welded to the top of each frame column and works in conjunction with the buckles of each fixed bracket to ensure the stability of the entire shielding device.

[0071] like Figure 22-24 As shown, the shielding module 7 includes a shielding module body 71, a folding handle 72, a dovetail structure 73, and a shielding module L-shaped hook 74. The shielding module body 71 is provided with a folding handle 72 and a shielding module L-shaped hook 74, and the edge of the shielding module body 71 is provided with a dovetail structure 73.

[0072] Each shielding module measures 502mm in length, 33mm in width, and 185.7mm in height, with an effective Pb thickness of 30mm and an outer stainless steel cladding of 1.5mm thickness. The total weight is approximately 25kg. It features a dovetail structure on all four sides, along with a folding handle on each side. These handles can be used during transport and folded away when not in use, facilitating operation without compromising the overall aesthetics. All shielding modules have two L-shaped hooks on the left side wall opposite the dovetail groove. These hooks are 50mm long, 35mm wide, 25mm high, and 5mm thick. The hooks are welded to the shielding module and interlock with the L-shaped hooks on the frame during installation.

[0073] The shielding performance of modular combined shielding devices depends primarily on the lead material thickness of the installed shielding modules. Monte Carlo software is used to perform relevant calculations based on the radioactive source terms and radiation source intensities at the nuclear power plant's drum station, determining the design lead thickness of the shielding modules while meeting relevant radiation control regulations for nuclear power plants.

[0074] The modular shielding device has an effective lead equivalent of 30mm, and its shielding performance is approximately 4.3 times that of a Cs137 gamma-ray (0.662 MeV) half-value layer and approximately 2.5 times that of a Co60 gamma-ray (1.25 MeV) half-value layer. Its shielding performance is approximately 6 times that of a single-layer soft lead shield commonly used in power plants.

[0075] Each shielding module adopts a dovetail design at the top, bottom, left, and right, which can effectively prevent radiation leakage at the connection points of the shielding blocks.

[0076] The modular shielding device is designed with multiple layers of safety and stability measures. First, the bottom of each frame adopts a rectangular steel plate flat self-stabilizing design, which can realize the assembly of the shielding device without damaging the ground. At the same time, the columns and bases are also designed with supporting components to enhance stability.

[0077] Secondly, each shielding module is designed with two L-shaped hooks, and each shielding module can be fastened to the frame hooks through the hooks, which also facilitates the precise positioning and assembly of each shielding module.

[0078] Furthermore, each frame is also designed with matching fixing brackets. After each shielding module is installed, the fixing brackets are then installed to press the shielding module and the frame together, achieving double fastening.

[0079] Finally, a seismic stability analysis was conducted on the entire device, which was found to meet the stability requirements for a magnitude 9 earthquake. Through multiple measures, both ease of installation and overall stability of the shielding structure were ensured.

[0080] The modular combined shielding device has most of its components in an integrated structure, with fewer scattered parts, making it easy to store and use.

[0081] All types of frames, fixed supports, and shielding modules are designed with standard specifications, can be freely combined and used, and are easy to install.

[0082] Modular shielding devices can be quickly assembled by simply adjusting the positions between the frames and then installing and securing the shielding modules in a modular fashion. The operation process is simple, and operators can master the installation requirements after simple training. No cooperation from other departments is required, making radiation shielding work highly effective.

[0083] The modular combination shielding device is a detachable and fixed radiation shielding device. It adopts a unified modular design, and the modules are interchangeable. After one-time installation, there is basically no need for regular and irregular maintenance due to concerns about radiation leakage caused by falling materials. It can effectively reduce the working time and workload of operators, reduce unnecessary radiation doses, and save resource costs.

[0084] Modular and modular shielding devices feature a detachable design and high versatility. They can be assembled into various shielding configurations to meet the shielding requirements of hotspot equipment, such as linear, right-angled L-shaped, П-shaped, and ш-shaped configurations. In multi-unit nuclear power plants, they can be switched between different units according to their needs, enabling a single set of equipment to be shared by multiple units, saving manufacturing costs and demonstrating economic efficiency.

[0085] The installation process of the modular combined shielding device provided by this invention is as follows:

[0086] Installation of each frame assembly

[0087] Step 1: Select one end frame and one single-head fixing bracket. The circular rubber pad of the single-head fixing bracket should face the rubber pad of the frame. Insert the base of the single-head fixing bracket into the П-shaped connector at the bottom of the end frame and fix it by rotating the pin and nut. Lock the top buckle of the single-head fixing bracket with the top clamping buckle of the end frame to complete the assembly of one end frame.

[0088] Step 2: Select one intermediate frame and one double-headed fixing bracket, and assemble them into one intermediate frame assembly according to the installation method in Step 1.

[0089] Step 3: Select one L-shaped corner frame and two single-head fixing brackets, and assemble them into one L-shaped corner frame assembly according to the installation method in Step 1.

[0090] Step 4: Select one T-shaped central frame and two single-head fixed brackets, and assemble them into one T-shaped central frame assembly according to the installation method in Step 1.

[0091] After assembly, each frame unit can be stored and used as a whole.

[0092] (2) Shielding module installation

[0093] Step 1: Select the required frame according to the purpose (taking the end frame and the middle frame as examples). The frames are arranged in a straight line, with the side of the frame column with the rubber pad facing the outside of the position to be shielded (i.e., the opposite direction of the hot spot equipment). The spacing of the L-shaped hooks on adjacent frame columns is slightly smaller than the hook spacing of the shielding module.

[0094] Step 2: Starting from the bottom layer, install the bottom layer shielding modules one by one from left to right or right to left, with the dovetail protrusions of the shielding modules facing upwards, and the L-shaped hooks of the shielding modules and the L-shaped hooks of the frame locked together.

[0095] Step 3: Repeat the method in Step 2 to install the shielding modules upwards in sequence. The dovetail grooves of the shielding modules that are adjacent vertically and horizontally should be tightly connected until all shielding modules are installed.

[0096] 6.2 Modular Combined Shielding Device Usage

[0097] (1) Determination of radiation shielding scheme

[0098] The scope and structural type of shielding measures, as well as the required number of frame assemblies and shielding modules, are determined based on the spatial location of the radioactive hotspot equipment and the affected area.

[0099] (2) Method of using shielding device

[0100] 1) How to use the ш-type shielding body

[0101] The shielding device can be used in various ways depending on the type of hotspot on site, and the specific methods are generally similar. For the shielding requirements of waste bin storage at nuclear power plant container loading stations, two ш-shaped shielding bodies, each 2.5m long, 2.5m wide, and 1.4m high, were designed and assembled. The specific usage method is as follows:

[0102] Select 3 end frame assemblies (2 left and 1 right or 2 right and 1 left), 2 L-shaped corner frame assemblies, 1 T-shaped middle frame assembly, and 20 intermediate frame assemblies. Arrange the frame assemblies in a ш-shaped structure. The distance between the L-shaped hooks of adjacent frame assemblies is about 280mm (slightly smaller than the distance between the L-shaped hooks of the shielding module). The side of each outer frame assembly with a fixed support faces outward, and the side of each middle frame assembly with a fixed support faces in the same direction.

[0103] Open the latches on the top of each frame assembly in sequence, and rotate each fixed bracket to lay it flat on the ground.

[0104] First, install the shielding modules starting from the bottom side. If necessary, fine-tune the positions of each frame assembly to complete the installation of all shielding modules at the bottom layer, thus securing the overall position of the entire shielding device. Next, install the shielding modules for each frame of the middle shielding wall, starting from the side and proceeding from bottom to top until all are installed. Then, fasten the fixing brackets of each frame of the middle shielding wall, lock the top clips, and tighten the middle fasteners. Finally, install the shielding modules for each frame of the outer shielding wall, again starting from the side and proceeding from bottom to top until all are installed. A total of 200 shielding modules are required for the entire structure.

[0105] Finally, complete the installation of all the fixed brackets for the outer shielding wall, lock the top buckles of each fixed bracket, tighten the middle fastening components, and complete the installation of the entire device.

[0106] 2) Method for removing the shielding device

[0107] First, open the fixed supports of each frame of the outer shielding wall in sequence; then, remove the shielding modules on each frame of the outer shielding wall in order from top to bottom; next, open the fixed supports of each frame of the middle shielding wall and remove the shielding modules on each frame of the middle shielding wall in sequence; finally, reinstall the fixed supports onto each frame and remove all components.

[0108] 3) Method for combining multiple sets of devices

[0109] When the shielding range is wide or there are special shielding requirements, multiple sets of devices can be used in combination. The usage method of each set of devices is basically the same as above.

[0110] Several common combinations of usage are as follows:

[0111] like Figure 26 As shown, the linear assembly requires one left end frame assembly, one right end frame assembly, several intermediate frame assemblies, and a shielding module.

[0112] like Figure 27 As shown, the L-shaped assembly requires one left end frame assembly, one right end frame assembly, one L-shaped corner frame assembly, several intermediate frame assemblies, and a shielding module.

[0113] like Figure 28 As shown, the П-type assembly requires one left end frame assembly, one right end frame assembly, two L-shaped corner frame assemblies, several intermediate frame assemblies, and a shielding module.

Claims

1. A modular combined shielding device, characterized in that: It includes an end frame, a middle frame, an L-shaped corner frame, a T-shaped middle frame, a single-head fixed bracket, a double-head fixed bracket, and a shielding module. The shielding module is connected and fixed to the middle frame, the L-shaped corner frame, the T-shaped middle frame, the single-head fixed bracket, and the double-head fixed bracket by means of snap-fit. The end frame includes a frame column, a base, L-shaped hooks, a clamping buckle, a rubber pad, a reinforcing rib support, and a П-shaped connector. A clamping buckle is installed at one end of the frame column, and a base is installed at the other end of the frame column. A reinforcing rib support is provided between the frame column and the base. A П-shaped connector is provided at the bottom of the base. Multiple L-shaped hooks are provided on one side of the frame column, and a rubber pad is provided on one side of the frame column. The single-head fixed bracket includes a snap fastener, a handle, a bolt, a rubber buffer pad, a base, a square buffer pad, a frame, and a connector. One end of the frame is provided with a snap fastener, and the other end is provided with a base connected by the connector. The connector includes a rotating pin and a nut. The base is provided with a square buffer pad, and the frame is provided with multiple bolts. One side of the bolt is provided with a handle, and the other side is provided with a rubber buffer pad. The double-headed fixing bracket includes a bracket body, a top module installed at the top of the bracket body, two buckles arranged in parallel on the top module, and a top module support between the bracket body and the top module. The other structures of the bracket body are the same as those of the single-headed fixing bracket. After each shielding module is installed, a single-head or double-head fixing bracket is installed to press the shielding module and the frame together to achieve double fastening.

2. The modular combined shielding device as described in claim 1, characterized in that: The intermediate frame includes an L-shaped hook, a rubber pad, a base, a P-shaped connector, a clamping buckle, an upright, and a reinforcing rib support. One end of the upright is equipped with a clamping buckle, and the other end is equipped with the base. A reinforcing rib support is provided between the upright and the base. The P-shaped connector is installed on the base, and a rubber pad is provided on the upright.

3. The modular combined shielding device as described in claim 1, characterized in that: The L-shaped corner frame includes a corner frame clamping buckle, a corner frame rubber pad, a corner frame upright, a corner frame P-shaped connector, a corner frame L-shaped hook, a corner frame reinforcing rib support, and a corner frame base. One end of the corner frame upright is provided with a corner frame clamping buckle, and the other end is provided with a corner frame base. A corner frame reinforcing rib support is provided between the corner frame upright and the corner frame base. A corner frame P-shaped connector is provided on the corner frame base. The corner frame upright is also provided with a corner frame L-shaped hook and a corner frame rubber pad.

4. The modular combined shielding device as described in claim 1, characterized in that: The T-shaped central frame includes a T-shaped frame L-shaped hook, a T-shaped frame rubber pad, a T-shaped frame base, a T-shaped frame first column, a T-shaped frame second column, a T-shaped frame P-shaped connector, a T-shaped frame clamping buckle, and a T-shaped frame reinforcing rib support. The T-shaped frame first column and T-shaped frame second column are mounted on the T-shaped frame base, which is equipped with a T-shaped frame P-shaped connector. Both the T-shaped frame first column and T-shaped frame second column are connected to the T-shaped frame base with T-shaped frame reinforcing rib support. The top of both the T-shaped frame first column and T-shaped frame second column is equipped with a T-shaped frame clamping buckle. The T-shaped frame first column and T-shaped frame second column are also equipped with a T-shaped frame L-shaped hook and a T-shaped frame rubber pad.

5. A modular combined shielding device as described in claim 1, characterized in that: The shielding module includes a shielding module body, a folding handle, a dovetail structure, and an L-shaped hook. The shielding module body is provided with a folding handle and an L-shaped hook, and the edge of the shielding module body is provided with a dovetail structure. The shielding module is made of lead material inside and stainless steel material on the outside.

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