Modular shielding device for radioactive waste of a nuclear power plant

Abstract

This application relates to a modular shielding device for radioactive waste from nuclear power plants, comprising a base frame, a first shielding mechanism, a housing, and a second shielding mechanism. The base frame includes multiple receiving cavities. The first shielding mechanism is fixedly connected to the base frame and covers the base frame, so that the receiving cavities form multiple shielding spaces, each shielding space for accommodating a radioactive waste container. The first shielding mechanism is provided with multiple openings corresponding to the multiple receiving cavities, each opening connecting the outside to the corresponding receiving cavity. The housing is fitted over the first shielding mechanism. The second shielding mechanism is disposed between the first shielding mechanism and the cavity walls of the receiving cavities. Compared with existing temporary lead shielding / lead walls or fixed shielding equipment, this application avoids the environmental pollution or toxicity to personnel caused by lead when using temporary lead sheets or lead bricks for shielding, while achieving effective closed shielding protection in all directions.

Description

Technical Field

[0001] This application relates to the field of radioactive material shielding technology for radiation protection in nuclear power plants, and in particular to a modular shielding device for radioactive waste from nuclear power plants. Background Technology

[0002] During nuclear power plant operation, waste generated by nuclear auxiliary systems, such as spent filter cartridges and spent resin, is highly radioactive and must be placed in standard waste containers and solidified with cement. During this process, some spent filter cartridges and other waste require temporary storage in these standard waste containers within designated rooms. As the number of standard waste containers temporarily storing intermediate- to high-level radioactive solid waste such as spent filter cartridges increases, localized hotspots can form, leading to a significant increase in environmental dose rate and a risk of exceeding environmental dose limits at the boundaries. Therefore, it is necessary to shield the standard waste containers containing high levels of radioactivity to ensure environmental safety and controllable collective dose to personnel.

[0003] In related technologies, shielding and protection measures for radioactive waste containers mainly include: temporary lead shielding / lead walls and fixed shielding equipment. Among them, temporary lead shielding / lead walls have poor mechanical stability and are limited by the mechanical properties of lead, with limited shielding thickness and height, making it impossible to effectively shield the upper part of radioactive standard waste containers, and posing a potential lead pollution risk to the environment and personnel. Fixed shielding equipment generally involves installing lead blocks or stainless steel-encased lead modules on a support frame fixed to the ground. The support frame is often connected to the ground by pre-embedded welding or expansion bolts, which is a complex installation process with a long installation time, resulting in a high radiation dose to personnel during installation. Summary of the Invention

[0004] Therefore, it is necessary to provide a modular shielding device for radioactive waste from nuclear power plants to address the issue of shielding radioactive waste containers.

[0005] This application provides a modular shielding device for radioactive waste from nuclear power plants, the modular shielding device comprising:

[0006] The base frame includes multiple receiving cavities;

[0007] A first shielding mechanism is fixedly connected to the base frame and covers the outside of the base frame so that the receiving cavity forms a shielding space. Each shielding space is used to accommodate a radioactive waste container. The first shielding mechanism is provided with multiple openings corresponding to the multiple receiving cavities. Each opening communicates with the outside and the corresponding receiving cavity.

[0008] The cabin is fitted outside the first shielding mechanism;

[0009] The second shielding mechanism is located between the first shielding mechanism and the bulkhead of the cabin.

[0010] In one embodiment, the sidewall of the cabin includes a double-layer side panel, the second shielding mechanism is disposed between the inner side panel of the double-layer side panel and the first shielding mechanism, and / or, the second shielding mechanism is disposed between the double-layer side panels.

[0011] In one embodiment, the second shielding mechanism includes a plurality of shielding members arranged circumferentially around the cabin and overlapping in sequence. The shielding members are provided with overlapping protrusions on both sides of the circumferential direction, and at least a portion of the overlapping protrusions of two adjacent shielding members are in contact with each other.

[0012] In one embodiment, the shielding component includes: an outer shielding plate, a first lead plate, a fixing plate, and a second lead plate. The outer shielding plate has a mounting cavity, and the first lead plate, the fixing plate, and the second lead plate are arranged sequentially in the mounting cavity. The outer shielding plate has overlapping protrusions on its two side walls along the circumferential direction.

[0013] In one embodiment, the outer shielding plate is provided with a lifting ring or a lifting lug.

[0014] In one embodiment, the cabin includes a connected base and a plurality of columns, the plurality of columns being arranged circumferentially around the base, and adjacent columns being connected by the double-layer side plates.

[0015] In one embodiment, the base includes a first base plate, a support frame, and a second base plate connected sequentially along the height direction of the cabin, wherein the first base plate, the support frame, and the second base plate define a space for accommodating a horizontal section of forklift forks.

[0016] In one embodiment, a through hole is provided on the double-layer side plate;

[0017] It also includes a fastening assembly, which includes a fastening bolt, a fastening nut, a connecting strip, and an abutment piece disposed on the connecting strip. The abutment piece passes through the through hole and abuts against the second shielding mechanism. The connecting strip has mounting holes at both ends. The fastening bolt is disposed on the column and passes through the mounting hole. The fastening nut is sleeved on the fastening bolt and abuts against the side of the fastening bolt away from the column.

[0018] In one embodiment, the cabin further includes a cover that covers the opening;

[0019] The opening and the aperture of the top cover gradually increase along a first direction, wherein the first direction is the direction away from the base along the height direction of the cabin.

[0020] In one embodiment, the system further includes multiple guide rings, with one guide ring located within each of the shielded spaces, the axial direction of which is parallel to the height direction of the cabin.

[0021] The aforementioned modular shielding device for radioactive waste from nuclear power plants forms multiple containment cavities within a base frame. These cavities can be flexibly arranged with radioactive waste containers according to actual needs, enabling modular management. This allows the shielding device to accommodate different quantities and sizes of radioactive waste containers, improving space utilization and operational flexibility, and facilitating the classified storage and centralized management of radioactive waste. The first shielding mechanism is placed outside the base frame, thus creating a shielded space within each containment cavity. Each shielded space can hold one radioactive waste container, providing radiation isolation and effectively preventing the diffusion of radioactive materials to the outside. Simultaneously, the openings on the first shielding mechanism precisely connect the outside to the corresponding containment cavity, facilitating the entry and exit of radioactive waste containers without affecting the shielding effect.

[0022] An outer casing is installed over the first shielding mechanism, providing robust external structural support and enhancing the overall stability of the shielding device. Furthermore, a second shielding mechanism is installed between the first shielding mechanism and the casing wall, forming a double-shielding protection system. After radiation from radioactive materials penetrates the first shielding mechanism, the second shielding mechanism further blocks and absorbs the radiation, reducing leakage from the casing wall and significantly improving the overall shielding effect of the modular shielding device. This effectively reduces radiation hazards to the surrounding environment and personnel, providing more reliable safety for operators and the surrounding environment, and enhancing the shielding performance of the modular shielding device for radioactive waste in nuclear power plants.

[0023] Compared to existing temporary lead shielding / lead walls, this application avoids the environmental pollution and personnel toxicity associated with temporary lead sheets or lead bricks used for shielding, while achieving effective closed-loop shielding protection in all directions. Compared to existing fixed shielding equipment, this application can be quickly installed and deployed within the facility area where standard containers for temporary radioactive waste are stored, eliminating the need for complex on-site installation work. The modular design ensures clear structure and independent function of each component of the shielding device, allowing for rapid assembly through simple combinations during installation, reducing installation difficulty and construction costs, and significantly decreasing personnel radiation exposure. During subsequent operation, the outer shielding modules can be flexibly adjusted according to the radioactivity level within the radioactive waste containers to meet different shielding requirements. In later maintenance, if a component malfunctions or is damaged, the corresponding module can be disassembled, repaired, or replaced specifically, without requiring large-scale modifications to the entire shielding device, improving maintenance efficiency and reducing maintenance costs and time. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of the outer casing of the first shielding mechanism provided in an embodiment of this application.

[0025] Figure 2 This is a first-view structural schematic diagram of a modular shielding device for radioactive waste from a nuclear power plant, provided in an embodiment of this application.

[0026] Figure 3 This is a second-view structural schematic diagram of a modular shielding device for radioactive waste from a nuclear power plant, provided in an embodiment of this application.

[0027] Figure 4 A cross-sectional view of a modular shielding device for radioactive waste from a nuclear power plant, provided in an embodiment of this application.

[0028] Figure 5 This is a schematic diagram of the shielding component provided in an embodiment of this application.

[0029] Figure 6 This is a schematic diagram of the structure of the connecting strip provided in the embodiment of this application, which has two sets of abutment groups.

[0030] Figure 7 This is a schematic diagram of a connecting strip with a set of abutment groups provided in an embodiment of this application.

[0031] Figure 8 This is a first-view structural schematic diagram of the cover provided in an embodiment of this application.

[0032] Figure 9 This is a structural schematic diagram of the top cover from a second perspective, provided in an embodiment of this application.

[0033] Figure label:

[0034] 100. First shielding mechanism; 110. Shielding top plate; 120. Shielding side plate; 130. Opening;

[0035] 200. Hull; 210. Double-layer side plate; 211. Through hole; 220. Base; 221. First bottom plate; 222. Support frame; 223. Second bottom plate; 230. Column; 240. Top cover; 241. Ring structure; 242. Supporting steel;

[0036] 300. Second shielding mechanism; 310. Shielding component; 320. Lifting lug; 330. Overlapping boss;

[0037] 400. Fastening bolts;

[0038] 500. Connecting strip; 510. Abutment piece;

[0039] 600, Rings;

[0040] 700, guide ring;

[0041] 800, Radioactive waste bins. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] This application provides a modular shielding device for radioactive waste from nuclear power plants, such as... Figures 1 to 4 As shown, the device includes a base frame, a first shielding mechanism 100, a chamber 200, and a second shielding mechanism 300. The base frame includes multiple receiving cavities. The first shielding mechanism 100 is fixedly connected to the base frame and covers the outside of the base frame so that the receiving cavities form shielded spaces. Each shielded space is used to accommodate a radioactive waste container 800. The first shielding mechanism 100 is provided with multiple openings 130 corresponding to the multiple receiving cavities. Each opening 130 connects the outside to the corresponding receiving cavity. The chamber 200 is fitted over the first shielding mechanism 100. The second shielding mechanism 300 is located between the first shielding mechanism 100 and the cavity wall of the receiving cavity.

[0049] The aforementioned modular shielding device for radioactive waste from nuclear power plants forms multiple containment cavities enclosed by a base frame. These cavities can be flexibly arranged with radioactive waste containers 800 according to actual needs, enabling modular management. This allows the shielding device to accommodate different numbers and sizes of radioactive waste containers 800, improving space utilization and operational flexibility, and facilitating the classified storage and centralized management of radioactive waste. The first shielding mechanism 100 is placed outside the base frame, thus creating shielded spaces within the containment cavities. Each shielded space can hold one radioactive waste container 800, providing radiation isolation and effectively preventing the diffusion of radioactive materials to the outside. Simultaneously, the opening 130 on the first shielding mechanism 100 precisely connects to the outside and the corresponding containment cavity, facilitating the entry and exit of the radioactive waste container 800 without affecting the shielding effect.

[0050] A cabin 200 is installed over the first shielding mechanism 100, providing robust external structural support and enhancing the overall stability of the shielding device. Furthermore, a second shielding mechanism 300 is installed between the first shielding mechanism 100 and the cabin 200, forming a double-shielding protection system. After radiation from radioactive materials penetrates the first shielding mechanism 100, the second shielding mechanism 300 further blocks and absorbs the radiation, reducing leakage from the cabin wall. This significantly improves the overall shielding effect of the modular shielding device, effectively reducing radiation hazards to the surrounding environment and personnel, providing more reliable safety for operators and the surrounding environment, and enhancing the shielding performance of the modular shielding device for radioactive waste in nuclear power plants.

[0051] Compared to existing temporary lead shielding / lead walls, this application avoids the environmental pollution and personnel toxicity associated with temporary lead sheets or lead bricks used for shielding, while achieving effective closed-loop shielding protection in all directions. Compared to existing fixed shielding equipment, this application can be quickly installed and deployed within the facility area where standard containers for temporary radioactive waste are stored, eliminating the need for complex on-site installation work. The modular design ensures clear structure and independent function of each component of the shielding device, allowing for rapid assembly through simple combinations during installation, reducing installation difficulty and construction costs, and significantly decreasing personnel radiation exposure. During subsequent operation, the outer shielding modules can be flexibly adjusted according to the radioactivity level within the radioactive waste containers to meet different shielding requirements. In later maintenance, if a component malfunctions or is damaged, the corresponding module can be disassembled, repaired, or replaced specifically, without requiring large-scale modifications to the entire shielding device, improving maintenance efficiency and reducing maintenance costs and time.

[0052] In one specific embodiment, such as Figures 1 to 4 As shown, the base frame encloses two accommodating cavities, and the first shielding mechanism 100 is installed outside the base frame, thereby making the two accommodating cavities inside the base frame form two shielding spaces.

[0053] In other embodiments, the number of cavities formed by the overlapping of the base frame is set according to the actual operational needs.

[0054] In one embodiment, such as Figures 1 to 4 As shown, the first shielding mechanism 100 includes a shielding top plate 110 and four shielding side plates 120 connected end to end. The shielding top plate 110 is located at one end of the multiple shielding side plates 120 and blocks one end of the multiple shielding side plates 120. An opening 130 is provided on the shielding top plate 110.

[0055] In this embodiment, four shielding side plates 120 are connected end to end to enclose a space forming a cuboid structure. A shielding top plate 110 is provided at one end of the multiple shielding side plates 120 to block the top of the space. An opening 130 is provided on the shielding top plate 110 to facilitate the placement of the radioactive waste container 800 through the corresponding opening 130 into the corresponding shielding space.

[0056] In one specific embodiment, the shielding side plate 120 includes a lead plate and a stainless steel plate including the lead plate, wherein the lead equivalent of the lead plate of the shielding side plate 120 is within 20-30 mmPb. The shielding top plate 110 includes a lead plate and a stainless steel plate including the lead plate, wherein the lead equivalent of the lead plate of the shielding top plate 110 is within 50-120 mmPb.

[0057] In one embodiment, such as Figures 1 to 4 As shown, the modular shielding device for radioactive waste in nuclear power plants also includes multiple guide rings 700, with one guide ring 700 in each shielding space. The axis of the guide ring 700 is parallel to the height direction of the compartment 200. By setting the guide ring 700 in the shielding space, with the axis of the guide ring 700, the height direction of the compartment 200, and the axis of the radioactive waste container 800 parallel, the guide ring 700 guides the entry or exit of the radioactive waste container 800.

[0058] In one specific embodiment, the inner diameter of the guide ring 700 is greater than or equal to the size of the opening 130.

[0059] In one embodiment, such as Figures 1 to 4 As shown, the sidewall of the chamber 200 includes double-layer side panels 210. A second shielding mechanism 300 is disposed between the inner side panel of the double-layer side panel 210 and the first shielding mechanism 100, and / or, the second shielding mechanism 300 is disposed between the double-layer side panels 210. By setting the sidewall of the chamber 200 as a double-layer side panel 210, the double-layer side panel 210 has higher resistance to deformation and impact than a single-layer side panel, and can effectively resist external impacts, compression and other mechanical forces, protecting the internal shielding mechanism and the radioactive waste container 800 from damage. Moreover, there is a gap between the double-layer side panels 210, and the second shielding mechanism 300 can be disposed between the inner side panel of the double-layer side panel 210 and the first shielding mechanism 100, and / or, the second shielding mechanism 300 is disposed between the double-layer side panels 210. By setting up double-layer side panels 210, the number of layers of the second shielding mechanism 300 set outside the first shielding mechanism 100 can be adjusted according to the shielding requirements of radioactive waste bins 800 with different radioactivity intensities, greatly improving flexibility.

[0060] In one specific embodiment, the second shielding mechanism 300 is disposed between the inner side plate of the double-layer side plate 210 and the first shielding mechanism 100. An additional layer of shielding protection can be added based on the first shielding mechanism 100. After the radiation generated by radioactive material penetrates the first shielding mechanism 100, the second shielding mechanism 300 can further block and absorb the radiation, reducing radiation leakage from the side wall of the cabin 200.

[0061] In one specific embodiment, the second shielding mechanism 300 is disposed between the double-layer side plates 210. The double-layer side plates 210 protect the second shielding mechanism 300, and together they form a composite shielding structure. This structure can attenuate radiation intensity from multiple levels, especially for radiation of different energies and types. Through multiple blocking and absorption mechanisms, it significantly improves shielding efficiency, ensuring that the radiation from the radioactive waste container 800 inside the shielding device is strictly limited to a safe range.

[0062] In one specific embodiment, such as Figure 3 As shown, the second shielding mechanism 300 has two layers. One layer is located between the inner side plate of the double-layer side plate 210 and the first shielding mechanism 100, while the other layer of the second shielding mechanism 300 is located between the double-layer side plates 210. The structure of the double-layer side plate 210 itself has a certain strength and stability. By using the structural advantages of the double-layer side plate 210, the structural strength of the entire shielding device can be enhanced. During transportation, installation, or use, it can better resist external impacts, vibrations, and other external forces, protecting the internal shielding mechanism and the radioactive waste container 800, and maintaining the normal function and safety of the shielding device.

[0063] In one embodiment, such as Figure 2 and Figure 3 As shown, the second shielding mechanism 300 includes multiple shielding members 310 arranged circumferentially around the chamber 200 and overlapping sequentially. Each shielding member 310 has overlapping protrusions 330 on both sides of its circumference, and at least a portion of the overlapping protrusions 330 of two adjacent shielding members 310 are in contact with each other. By configuring the second shielding mechanism 300 as multiple overlapping shielding members 310, it more flexibly meets the shielding requirements of the radioactive waste container 800 within each containment chamber. Furthermore, the close contact of adjacent overlapping protrusions 330 avoids straight seams and prevents radiation leakage.

[0064] In one specific embodiment, the shielding component 310 includes: an outer shielding plate, a first lead plate, a fixing plate, and a second lead plate. The outer shielding plate has a mounting cavity, and the first lead plate, the fixing plate, and the second lead plate are sequentially arranged within the mounting cavity. Overlapping bosses 330 are provided on the side walls of both sides of the outer shielding plate along the circumferential direction. A double layer of lead plates (the first lead plate and the second lead plate) is provided within the mounting cavity of the outer shielding plate to improve the shielding effect. A fixing plate is provided between the double lead plates to ensure the support of the lead plates and prevent deformation. Overlapping bosses 330 are provided on both sides of the outer shielding plate along the circumferential direction. The overlapping bosses 330 of two adjacent shielding components 310 overlap to form a Z-shaped gap, avoiding straight seams and preventing radiation leakage from the Z-shaped gap.

[0065] In one specific embodiment, the outer shielding plate is made of stainless steel.

[0066] In one specific embodiment, the lead equivalent of the shield 310 is between 20-50 mmPb.

[0067] In one specific embodiment, the fixing plate has a honeycomb structure. The unique geometry of the honeycomb structure gives it excellent mechanical properties, effectively supporting the first and second lead plates, dispersing external forces on the lead plates, and preventing deformation or bending due to their own weight or external pressure. This ensures the structural stability of the shielding component 310 and maintains its normal shielding function. Furthermore, when subjected to external vibrations or impacts, the numerous chambers of the honeycomb structure can absorb and buffer energy, reducing the impact of vibrations and impacts on the lead plates, protecting them from damage, and ensuring the stability of the shielding effect. In addition, compared to a solid structure, the honeycomb structure has the advantage of being lightweight. While maintaining the strength to support the lead plates, it can reduce the overall weight of the shielding component 310, facilitating installation, transportation, and use.

[0068] In one specific embodiment, such as Figure 5 As shown, the outer shielding plate is equipped with lifting rings or lifting lugs 320 to facilitate the hoisting of individual shielding components 310.

[0069] Furthermore, such as Figures 1 to 4 As shown, the cabin 200 includes a connected base 220 and multiple columns 230. The columns 230 are arranged circumferentially around the base 220, and adjacent columns 230 are connected by double-layer side plates 210. The base 220 serves as a basic support component, providing a stable load-bearing platform. The multiple columns 230 are arranged circumferentially around the base 220 to form a rigid frame structure. Adjacent columns 230 are connected by double-layer side plates 210, forming a grid-like support system of "column 230-side plate". The double-layer side plates 210 themselves have a certain strength, and when combined with the columns 230, they can enhance the bending and shear resistance of the sidewalls of the cabin 200, improve the rigidity and seismic performance of the overall structure, and are suitable for environments with high equipment stability requirements, such as nuclear power plants.

[0070] In one specific embodiment, such as Figures 1 to 4 As shown, the base 220 of this application is provided with four columns 230, and two adjacent columns 230 are connected by double-layer side plates 210, thereby forming a receiving cavity with the top end communicating with the outside.

[0071] In one embodiment, such as Figures 1 to 4 As shown, the column 230 is equipped with lifting rings or lifting lugs 320. When multiple shielding devices are spliced ​​together, the lifting rings or lifting lugs 320 on the column 230 can serve as auxiliary positioning components for connecting modules, facilitating rapid assembly or disassembly. For example, the scalability of the system can be improved by hoisting an additional cabin 200 and splicing it with the existing structure.

[0072] In one specific embodiment, the lifting rings on the column 230 are selected from GB825-1988 lifting rings.

[0073] In one embodiment, such as Figures 1 to 4 As shown, the base 220 includes a first base plate 221, a support frame 222, and a second base plate 223 connected sequentially along the height direction of the cabin 200. The first base plate 221, the support frame 222, and the second base plate 223 define a space for accommodating the horizontal section of the forklift forks. The space formed between the first base plate 221, the support frame 222, and the second base plate 223 can directly accommodate the horizontal section of the forklift (such as the forks) without the need for additional lifting equipment or transfer brackets. This "embedded" design allows forklift forks to be quickly positioned, reducing manual adjustment steps and improving the installation efficiency of the shielding device. Moreover, as the intermediate load-bearing component of the base 220, the support frame 222 can evenly transfer the load during forklift lifting to the first base plate 221 and the second base plate 223, preventing excessive local stress that could cause deformation of the base 220.

[0074] In addition, the first base plate 221 serves as the upper load-bearing surface of the base 220, directly supporting the weight of the cabin 200 columns 230, the first shielding mechanism 100, the second shielding mechanism 300, and the radioactive waste container 800. The support frame 222 forms a grid-like or grid-shaped support skeleton, converting vertical loads into horizontally dispersed forces, significantly improving the bending and shear strength of the base 220 to meet heavy-load requirements. The second base plate 223 serves as the lower support surface of the base 220, reducing pressure by increasing the stress-bearing area, preventing the base 220 from sinking into the ground or damaging the forklift fork surface. The three-layer structure works synergistically, enabling the base 220 to maintain shape stability under heavy loads and extending its service life.

[0075] In one specific embodiment, the first base plate 221 and the second base plate 223 are integral steel plates.

[0076] In one specific embodiment, the height of the support frame 222 is 150-200mm.

[0077] In one embodiment, such as Figure 2 , Figure 6 as well as Figure 7 As shown, a second shielding mechanism 300 is provided in the gap between the double-layer side plates 210. In order to reduce the shaking of the second shielding mechanism 300 and ensure installation stability, a through hole 211 is provided on the double-layer side plates 210. The modular shielding device for radioactive waste of nuclear power plants also includes a fastening assembly, which includes: a fastening bolt 400, a fastening nut, a connecting strip 500, and an abutment piece 510 provided on the connecting strip 500. The abutment piece 510 passes through the through hole 211 and abuts against the second shielding mechanism 300. The two ends of the connecting strip 500 are provided with mounting holes. The fastening bolt 400 is provided on the column 230 and passes through the mounting hole. The fastening nut is sleeved on the fastening bolt 400 and abuts against the side of the connecting strip 500 away from the column 230.

[0078] The abutment piece 510 passes through the through hole 211 of the double-layer side plate 210 and directly abuts against the second shielding mechanism 300, which can prevent the second shielding mechanism 300 from shifting due to vibration or thermal expansion and contraction during long-term use. The fastening bolts 400 on the column 230 cooperate with the mounting holes at both ends of the connecting strip 500, providing a clear positioning reference for the assembly process. Then, the fastening nuts are used to lock the connecting strip 500 and the column 230, which makes the abutment piece 510 abut against the side plate of the second shielding mechanism 300, thus locking the second shielding mechanism 300 and the cabin 200.

[0079] The cabin 200 and the second shielding mechanism 300 are tightly connected by fastening components (fastening bolts 400, fastening nuts, connecting strips 500, and abutment plates 510), forming a cohesive structure that shares the load. When the cabin 200 is subjected to external impacts (such as earthquakes or collisions) or the weight load of the internal radioactive waste container 800, the fastening components can effectively transfer stress, reducing the relative displacement or loosening between the double-layer side plates 210 and the second shielding mechanism 300, and ensuring the long-term structural stability of the shielding device.

[0080] In one embodiment, such as Figure 6 and Figure 7 As shown, the connecting strip 500 is provided with two abutting pieces 510 arranged at intervals along the height direction, and the two abutting pieces 510 arranged at intervals along the height direction form an abutting group; multiple abutting groups are provided, and multiple abutting groups are arranged at intervals along the length direction of the connecting strip 500.

[0081] It should be noted that the number of abutment groups is set according to actual operational needs. For example, if there is only one through hole 211 on the double-layer side plate 210, then one set is sufficient. If there are two or even three through holes 211 in the same row on the double-layer side plate 210, then two or even three sets of abutment groups are set on one connecting strip 500.

[0082] In this embodiment, as Figure 2 and Figure 6 As shown, two layers of through holes 211 are provided on the long side of the cabin 200, with two through holes 211 in each layer. This corresponds to the need for two sets of fastening components. Each fastening component has two sets of abutment groups on its connecting strip 500.

[0083] In this embodiment, as Figure 2 and Figure 7 As shown, a layer of through holes 211 is provided on the long side of the cabin 200. Each layer has one through hole 211, which corresponds to two sets of fastening components. Each fastening component has a set of abutment groups on the connecting strip 500.

[0084] In this embodiment, as Figure 2 As shown, a third set of fastening components is also provided on the long side of the cabin 200. The third set of fastening components is located above the double-layer side plate 210 and abuts against the side wall of the second shielding mechanism 300.

[0085] In one specific embodiment, a reinforcing structure is provided on the double-layer side plate 210 to increase the structural strength of the double-layer side plate 210.

[0086] In one embodiment, such as Figure 2 , Figure 8 as well as Figure 9 As shown, the chamber 200 also includes a top cover 240, which covers the opening 130. The opening 130 and the top cover 240 have gradually increasing diameters along a first direction, which is the direction away from the base 220 along the height direction. By setting the top cover 240 to seal the opening 130, the top of the radioactive waste container 800 is effectively shielded and wrapped, greatly reducing the impact on the environment and personnel, and ensuring that the collective dose meets the requirements. Moreover, the design of the top cover 240 and the opening 130 having gradually increasing diameters along the height direction away from the base 220 not only provides a larger space in the opening 130 when loading and unloading the radioactive waste container 800, making it easier for operators to align the waste container with the opening 130 and smoothly put it in or take it out, significantly reducing the difficulty and complexity of operation and effectively improving the efficiency of loading and unloading the waste container; but also prevents radiation from passing through the gaps.

[0087] It should be noted that there are multiple top covers 240, and the number of top covers 240 is equal to the number of openings 130.

[0088] In one specific embodiment, the top cover 240 includes a lead block and a stainless steel body including the lead block, the outer peripheral surface of which is adapted to the shape of the opening 130.

[0089] In one specific embodiment, such as Figure 2 , Figure 8 as well as Figure 9 As shown, the stainless steel outer surface of the top cover 240 and the opening 130 are both conical, with the larger end of the cone facing outward and the smaller end facing the shielding space to prevent rays from passing through the gaps.

[0090] In one specific embodiment, such as Figure 2 and Figure 8 As shown, a ring structure 241 is set on the top of the stainless steel, which can be directly lifted by a standard barrel-specific lifting tool without the need to add lifting tools. It can also stack multiple shielded round covers, which is convenient to operate and saves costs and space.

[0091] In one specific embodiment, such as Figure 2 and Figure 9 As shown, a supporting steel section 242 is provided at the bottom of the stainless steel to increase the structural strength of the cover.

[0092] In summary, the modular shielding device for radioactive waste from nuclear power plants proposed in this application can accommodate two standard 400L radioactive waste containers 800, effectively shielding the standard containers that temporarily store solid waste such as radioactive waste filter cartridges, ensuring that the environmental dose rate in the area where the standard containers are located meets the radiation zoning and boundary requirements. Furthermore, considering the significant differences in dose rates among standard containers temporarily storing different radioactive filter cartridges or waste resins, an innovative design of a second shielding mechanism 300 is adopted. The number of layers of the second shielding mechanism 300 can be increased (or decreased) according to different radiation protection needs, thereby adjusting the shielding thickness and greatly improving flexibility.

[0093] This application also provides a method for installing a modular shielding device for radioactive waste from nuclear power plants, which can be used to temporarily store standard containers of radioactive solid waste such as waste filter cartridges. The basic steps for its installation and use include:

[0094] Step 1: Position the base frame, the first shielding mechanism 100, and the cabin 200 in the standard barrel temporary storage workshop using a forklift or hoisting method;

[0095] Step 2: Based on the radioactivity intensity and environmental dose rate requirements of the standard barrel to be stored, calculate and determine the required shielding thickness on the side of the shielding device, and determine the number of layers of the second shielding mechanism 300.

[0096] Step 3: Using the hoisting device inside the factory, install the multiple shielding components 310 of the required second shielding mechanism 300 one by one between the first shielding mechanism 100 and the cavity wall of the receiving cavity;

[0097] Step 4: Install the fastening assembly to the side of the hull 200;

[0098] Step 5: The radioactive waste container 800 to be stored is hoisted into the shielded space using a special lifting device;

[0099] Step 6: Use the special lifting tool for radioactive waste container 800 to lift the top cover 240 to the corresponding position of the opening 130.

[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A modular shielding device for radioactive waste from nuclear power plants, characterized in that, The modular shielding device for radioactive waste from the nuclear power plant includes: The base frame includes multiple receiving cavities; A first shielding mechanism (100) is fixedly connected to the base frame and covers the base frame so that the receiving cavity forms a shielding space. Each of the shielding spaces is used to receive a radioactive waste container (800). The first shielding mechanism (100) is provided with a plurality of openings (130) corresponding to the plurality of receiving cavities. Each opening (130) connects the outside to the corresponding receiving cavity. The cabin (200) is fitted outside the first shielding mechanism (100); The second shielding mechanism (300) is disposed between the first shielding mechanism (100) and the bulkhead of the cabin (200); The sidewall of the cabin (200) includes a double-layer side plate (210), the second shielding mechanism (300) is disposed between the inner side plate of the double-layer side plate (210) and the first shielding mechanism (100), and / or, the second shielding mechanism (300) is disposed between the double-layer side plates (210); The second shielding mechanism (300) includes a plurality of shielding members (310) arranged circumferentially around the cabin (200) and overlapping in sequence. The shielding members (310) are provided with overlapping protrusions (330) on both sides of the circumferential direction. At least a portion of the two overlapping protrusions (330) of two adjacent shielding members (310) are in contact. The cabin (200) includes a connected base (220) and a plurality of columns (230), the plurality of columns (230) are arranged circumferentially around the base (220), and adjacent columns (230) are connected by the double-layer side plate (210).

2. The modular shielding device for radioactive waste from nuclear power plants according to claim 1, characterized in that, The shielding component (310) includes: an outer shielding plate, a first lead plate, a fixing plate, and a second lead plate. The outer shielding plate has an installation cavity. The first lead plate, the fixing plate, and the second lead plate are arranged sequentially in the installation cavity. The outer shielding plate has overlapping protrusions (330) on its two side walls along the circumferential direction.

3. The modular shielding device for radioactive waste from nuclear power plants according to claim 2, characterized in that, The outer shielding plate is provided with a lifting ring or lifting lug (320).

4. The modular shielding device for radioactive waste from nuclear power plants according to claim 1, characterized in that, The base (220) includes a first base plate (221), a support frame (222), and a second base plate (223) connected sequentially along the height direction of the cabin (200). The first base plate (221), the support frame (222), and the second base plate (223) define a space for accommodating a horizontal section of forklift forks.

5. The modular shielding device for radioactive waste from nuclear power plants according to claim 1, characterized in that, The double-layer side plate (210) has through holes (211); It also includes a fastening assembly, which includes: a fastening bolt (400), a fastening nut, a connecting strip (500), and an abutment piece (510) disposed on the connecting strip (500). The abutment piece (510) passes through the through hole (211) and abuts against the second shielding mechanism (300). The connecting strip (500) has mounting holes at both ends. The fastening bolt (400) is disposed on the column (230) and passes through the mounting hole. The fastening nut is sleeved on the fastening bolt (400) and abuts against the side of the connecting strip (500) away from the fastening bolt (400).

6. The modular shielding device for radioactive waste from nuclear power plants according to claim 1, characterized in that, The cabin (200) also includes a cover (240) which covers the opening (130); The opening (130) and the top cover (240) have gradually increasing diameters along a first direction, wherein the first direction is the direction away from the base (220) along the height direction of the cabin (200).

7. The modular shielding device for radioactive waste from nuclear power plants according to claim 1, characterized in that, It also includes multiple guide rings (700), with one guide ring (700) in each of the shielding spaces, and the axial direction of the guide ring (700) being parallel to the height direction of the cabin (200).

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