A natural rubber based shielding device
By designing a natural rubber-based shielding device, combined with various modules and modified materials, the radiation risk of radioactive hotspots in nuclear power units was resolved, achieving efficient and convenient radiation shielding while reducing operational difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CNNC NUCLEAR POWER OPERATION MANAGEMENT CO LTD
- Filing Date
- 2026-03-04
- Publication Date
- 2026-06-09
AI Technical Summary
Existing nuclear power units contain radioactive hotspots, resulting in high radiation risks. Traditional soft lead shielding materials are inconvenient to use and difficult to effectively reduce radiation impact and operating costs.
The shielding device uses natural rubber as its base. By combining modules of different sizes, such as 4-inch straight pipes and 90° elbow modules, and utilizing the middle functional layer and outer silicone structure, combined with materials such as nano boron carbide, nano high-density metal powder and modified gadolinium oxide, a stable shielding assembly is formed and fixed by Velcro.
It achieves high-efficiency radiation shielding performance, reduces operational difficulty and cost, improves safety and convenience, and reduces the radiation impact on the workplace.
Smart Images
Figure CN122177535A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of radiation protection, and more particularly to a shielding device based on natural rubber. Background Technology
[0002] As nuclear power units operate for longer periods, highly radioactive hotspots can form in some radioactive systems, equipment, or pipe walls. These hotspots primarily originate from the deposition of corrosion activation products within the system, and are characterized by high dose rates, fixed locations, and difficulty in elimination. The presence and potential increase of these hotspots raise the radiation risk for on-site operations and may even affect the environmental dose rate at the boundary of radiation control zones.
[0003] To reduce on-site radiation safety risks and actively implement the principle of optimal radiation protection, it is necessary to take protective measures such as radiation shielding to address long-standing hotspots. Since the shielding performance of a single soft lead shield commonly used in power plants is limited, a large quantity of shielding material is required to achieve the desired effect. Furthermore, the limited space in the rooms where power plants are currently hotspots poses significant difficulties for the transportation and installation of shielding materials. Moreover, the shielding dismantling and assembly operations require scaffolding, resulting in a large workload and high dose costs. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a natural rubber-based shielding device that not only meets the radiation protection requirements in terms of shielding performance, but also has strong safety and ease of operation, reduces the operational dose of repeated shielding construction, and reduces the radiation impact of hotspot pipelines on the workplace and related control boundaries.
[0005] This invention provides a natural rubber-based shielding device, which is made of shielding material into modules of different sizes, and can be adjusted into different shielding assemblies according to the different shapes of hotspot pipelines; The shielding material includes an intermediate functional layer and an outer layer disposed on both sides of the intermediate functional layer. The outer layer is made of silicone, and the intermediate functional layer is made of lead rubber. The shielding assembly includes: shielding modules of different lengths of 4-inch straight pipe, shielding modules of 4-inch pipe 90° elbow, shielding modules of 4-inch pipe equal diameter tee, shielding modules of different lengths of 2-inch straight pipe, shielding modules of 2-inch pipe 90° elbow, shielding modules of 2-inch pipe 45° elbow, shielding modules of different lengths of 1½-inch straight pipe, and shielding modules of 1½-inch pipe 90° elbow. All modules are assembled to form a complete tubular outer wall.
[0006] As a further technical solution, the intermediate functional layer includes the following components: Natural rubber: 60-80 parts; Nano boron carbide: 5-15 parts; Nano-high density metal powder: 15-23 parts; Modified gadolinium oxide: 3-10 parts; Plasticizer: 3-8 parts; Vulcanizing agent: 1-3 parts; Accelerator: 0.5-2 parts; Anti-aging agent: 1-2 parts.
[0007] As a further technical solution, the method for preparing the modified gadolinium oxide is as follows: Gadolinium oxide powder was dispersed in an organic solvent, and a silane coupling agent was added. The mixture was stirred and reacted to allow the active groups in the silane coupling agent molecules to react chemically with the hydroxyl groups on the surface of gadolinium oxide, forming an organic molecular coating layer on the surface of gadolinium oxide, thus obtaining modified gadolinium oxide.
[0008] As a further technical solution, the nano-high-density metal powder is nano-high-purity lead powder or tungsten powder; The particle size of the high-density nano metal powder is 50~200nm; The particle size of the boron carbide nanoparticles is 50~200nm.
[0009] As a further technical solution, the 4-inch straight tube shielding module is divided into two arc-shaped parts, which are connected by spring steel to form a complete outer wall, and the outer side is locked with Velcro. The two arc-shaped sections are wedge-shaped in both the axial and radial directions.
[0010] As a further technical solution, the 4-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 4-inch pipe equal diameter tee shielding module is divided into two parts, which are locked and fixed to the outside of the hot spot pipe with Velcro.
[0011] As a further technical solution, the 2-inch straight pipe shielding module is an integrated strip structure, which is wrapped around the outside of the hot spot pipe and the joint is locked and fixed by Velcro. The axial direction is wedge-shaped, and a bevel is reserved in the radial direction; The structure of the 1½-inch straight tube shielded module is the same as that of the 2-inch straight tube shielded module.
[0012] As a further technical solution, the 2-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 2-inch pipe 45° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 1½-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. Both parts are designed in a wedge shape in both the axial and radial directions.
[0013] As a further technical solution, the thickness of each shielding module is 16~20mm.
[0014] As a further technical solution, the shielding assembly includes three 4-inch straight tube shielding modules of lengths of 300mm, 100mm and 200mm, two 2-inch straight tube shielding modules of lengths of 300mm and 200mm, and two 1½-inch straight tube shielding modules of lengths of 120mm and 300mm.
[0015] Compared with the prior art, the natural rubber-based shielding device of the present invention has the following beneficial effects: (1) It has strong stability and safety, avoiding the safety impact of heavy load on hot pipelines; (2) During installation and dismantling, compared with the shielding erection method or other shielding methods using scaffolding as support of the same scale, the workload and operation time are greatly reduced, and the space occupied is small, which does not affect the implementation of other maintenance work on site. (3) It is easy to install and will not deform. It is easy to operate, has strong stability, and its shielding performance is significantly improved compared with other shielding methods. (4) Multiple shielding assemblies can be combined to meet the shielding requirements of various types of hot spots without affecting the system function. Attached Figure Description
[0016] Figure 1 A schematic diagram showing the structure of a natural rubber-based shielding device; Figure 2 A schematic diagram showing the structure of a 4-inch straight tube shielded module 300mm-A; Figure 3 A schematic diagram showing the structure of a 4-inch straight tube shielded module 300mm-B; Figure 4 A schematic diagram showing the structure of a 4-inch straight tube made of 300mm spring steel; Figure 5 An assembly diagram showing a 300mm 4-inch straight tube shielded module; Figure 6 A schematic diagram showing the structure of a 4-inch straight tube shielded module 100mm-A; Figure 7 A schematic diagram showing the structure of a 4-inch straight tube shielded module 100mm-B; Figure 8 A schematic diagram showing the structure of a 4-inch straight tube made of 100mm spring steel. Figure 9 An assembly diagram showing a 100mm 4-inch straight tube shielded module; Figure 10A schematic diagram showing the structure of shielding body A for a 90° bend in a 4-inch pipe; Figure 11 A schematic diagram showing the structure of shielding body B for a 90° bend in a 4-inch pipe; Figure 12 An assembly diagram showing the shielding of a 4-inch pipe 90° elbow; Figure 13 A schematic diagram showing the structure of a 4-inch straight tube shielded module 200mm-A; Figure 14 A schematic diagram showing the structure of a 4-inch straight tube shielded module 200mm-B; Figure 15 A schematic diagram showing the structure of a 4-inch straight tube made of 200mm spring steel; Figure 16 An assembly diagram showing a 200mm 4-inch straight tube shielded module; Figure 17 A schematic diagram showing the structure of shielding body A for a 4-inch tube tee; Figure 18 A schematic diagram showing the structure of the shielding body B for a 4-inch tube tee; Figure 19 This diagram illustrates the assembly of a shielded 4-inch pipe equal diameter tee module. Figure 20 A schematic diagram showing the structure of shielding body A for a 90° bend in a 2-inch pipe; Figure 21 A schematic diagram showing the structure of shielding body B for a 90° bend in a 2-inch pipe; Figure 22 A schematic diagram showing the structure of a shielding module for a 2-inch pipe 90° elbow. Figure 23 A schematic diagram showing the structure of a 2-inch straight tube shield with a diameter of 300mm; Figure 24 An assembly diagram showing a 300mm 2-inch straight tube shielded module; Figure 25 A schematic diagram showing the structure of shielding body A for a 45° elbow of a 2-inch pipe; Figure 26 A schematic diagram showing the structure of shielding body B for a 45° bend in a 2-inch pipe; Figure 27 This diagram illustrates the assembly of a 2-inch pipe 45° elbow shielding module. Figure 28 A schematic diagram showing the structure of a 2-inch straight tube shield with a diameter of 200mm. Figure 29 An assembly diagram showing a 200mm 2-inch straight tube shielded module; Figure 30 A schematic diagram showing the structure of shielding body A for a 1½-inch pipe 90° elbow; Figure 31A schematic diagram showing the structure of shielding body B for a 1½-inch pipe 90° elbow; Figure 32 A schematic diagram showing the structure of a shielding module for a 1½-inch pipe 90° elbow; Figure 33 A schematic diagram showing the structure of a 1.5-inch straight tube shield with a diameter of 120mm. Figure 34 An assembly diagram showing a 120mm 1½-inch straight tube shielded module; Figure 35 A schematic diagram showing the structure of a 1½-inch straight tube shield with a diameter of 300mm; Figure 36 An assembly diagram showing a 300mm 1½-inch straight tube shielded module; The diagram shows shielded modules for 4-inch straight pipes (1-300mm), 4-inch straight pipes (2-100mm), 90° elbows (3-4 inch), 4-inch straight pipes (4-200mm), equal diameter tees (5-4 inch), 2-inch pipes (6-2 inch), 90° elbows (7-300mm), 45° elbows (8-2 inch), 2-inch straight pipes (9-200mm), 10-1½ inch pipes (90° elbows), 1½ inch straight pipes (11-120mm), and 1½ inch straight pipes (12-300mm). Detailed Implementation
[0017] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.
[0018] An embodiment of the present invention discloses a natural rubber-based shielding device, such as... Figure 1 As shown, modules of different sizes are made of shielding material, and different shielding assemblies are formed according to the different shapes of the hotspot pipelines; The shielding material includes an intermediate functional layer and an outer layer disposed on both sides of the intermediate functional layer. The outer layer is made of silicone, and the intermediate functional layer is made of lead rubber, which ensures its good performance and prevents lead powder from being exposed and directly contacted by the human body. The shielding assembly includes: 4-inch straight pipe shielding modules of different lengths, 4-inch pipe 90° elbow shielding module 3, 4-inch pipe equal diameter tee shielding module 5, 2-inch straight pipe shielding modules of different lengths, 2-inch pipe 90° elbow shielding module 6, 2-inch pipe 45° elbow shielding module 8, 1½-inch straight pipe shielding modules of different lengths, and 1½-inch pipe 90° elbow shielding module 10; All modules are assembled to form a complete tubular outer wall, which covers the outside of the hot spot pipe. The thickness of each shielding module is 16~20mm.
[0019] In the shielding material, the intermediate functional layer is made of lead rubber and includes the following components: Natural rubber: 60-80 parts; Nano boron carbide: 5-15 parts; Nano-high density metal powder: 15-23 parts; Modified gadolinium oxide: 3-10 parts; Plasticizer: 3-8 parts; Vulcanizing agent: 1-3 parts; Accelerator: 0.5-2 parts; Anti-aging agent: 1-2 parts.
[0020] The method for preparing the modified gadolinium oxide is as follows: Gadolinium oxide powder was dispersed in an organic solvent, and a silane coupling agent was added. The mixture was stirred and reacted to allow the active groups in the silane coupling agent molecules to react chemically with the hydroxyl groups on the surface of gadolinium oxide, forming an organic molecular coating layer on the surface of gadolinium oxide, thus obtaining modified gadolinium oxide.
[0021] After modification, gadolinium oxide exhibits significantly improved compatibility with the natural rubber matrix, allowing for better and more uniform dispersion within the rubber system and fully leveraging its gamma-ray shielding effect. Gadolinium oxide itself possesses a high atomic number and thermal neutron absorption cross-section, providing some shielding capability against both gamma rays and neutrons. Surface modification further enhances its dispersion stability and interfacial bonding in composite materials, thereby improving the overall radiation shielding effectiveness of the material.
[0022] The high-density nano metal powder is high-purity nano lead powder or tungsten powder.
[0023] The particle size of the high-density nano metal powder is 50~200nm; The particle size of the boron carbide nanoparticles is 50~200nm.
[0024] The aforementioned high-density metal powder, boron carbide nanoparticles, possesses high hardness, good thermal stability, excellent neutron absorption capacity, and good gamma-ray shielding effect.
[0025] Its nanoscale size allows it to be more uniformly dispersed in the natural rubber matrix, effectively increasing the contact area with rubber molecules. This improves the shielding performance while minimizing the negative impact on the mechanical properties of the rubber.
[0026] The plasticizer is dioctyl phthalate or dioctyl sebacate, which can increase the plasticity and flexibility of natural rubber, reduce the interaction forces between rubber molecules, making it easier to flow and mold during processing. At the same time, it helps to improve the dispersion of fillers in the rubber matrix and improve the overall performance of composite materials.
[0027] The vulcanizing agent is sulfur. During the rubber processing, sulfur molecules can undergo a cross-linking reaction with the natural rubber molecular chains to form a three-dimensional network structure, thereby improving the strength, hardness, wear resistance, and aging resistance of the rubber, giving the rubber material better performance and stability.
[0028] The accelerator is N-cyclohexyl-2-benzothiazole sulfenamide, which can accelerate the vulcanization reaction, reduce the vulcanization temperature, shorten the vulcanization time, improve production efficiency, and optimize the physical properties of the vulcanized rubber, making the vulcanization process more efficient and controllable.
[0029] The antioxidant is a 2,2,4-trimethyl-1,2-dihydroquinoline polymer, which can effectively inhibit the aging phenomenon of natural rubber caused by heat, light, oxygen and other factors during use, extend the service life of the material and maintain the stability of its various properties.
[0030] The natural rubber-based ionizing radiation shielding material of the present invention preferably comprises the following components: Natural rubber: 65-75 parts; Nano boron carbide: 8-12 parts; Nano-high purity lead powder or tungsten powder: 17-23 parts; Modified gadolinium oxide: 5-8 parts; Dioctyl phthalate or dioctyl sebacate: 5-7 parts; Sulfur: 1.5-2.5 parts; N-Cyclohexyl-2-benzothiazole sulfenamide: 1-1.5 parts; 2,2,4-Trimethyl-1,2-Dihydroquinoline polymer: 1.5-2 parts.
[0031] Different sized modules are adjusted into different shielding assemblies according to the different shapes of hotspot pipelines; the shielding assemblies include: 4-inch straight pipe shielding modules of different lengths, 4-inch pipe 90° elbow shielding module 3, 4-inch pipe equal diameter tee shielding module 5, 2-inch straight pipe shielding modules of different lengths, 2-inch pipe 90° elbow shielding module 6, 2-inch pipe 45° elbow shielding module 8, 1½-inch straight pipe shielding modules of different lengths, and 1½-inch pipe 90° elbow shielding module 10; Specifically, it includes 4-inch straight pipe shielding modules in three lengths: 300mm, 100mm, and 200mm; 4-inch pipe 90° elbow shielding module 3; 4-inch pipe equal diameter tee shielding module 5; 2-inch straight pipe shielding modules in two lengths: 300mm and 200mm; 2-inch pipe 90° elbow shielding module 6; 2-inch pipe 45° elbow shielding module 8; 1½-inch straight pipe shielding modules in two lengths: 120mm and 300mm; and 1½-inch pipe 90° elbow shielding module 10.
[0032] Different shielding equipment combinations can be adjusted according to the different shapes of hotspot pipelines.
[0033] like Figures 2-5 As shown, the 300mm 4-inch straight tube shielding module 1 includes one 4-inch straight tube shielding module 300mm-A, one 4-inch straight tube shielding module 300mm-B, two 5cm×55cm Velcro straps, one 4-inch straight tube 300mm spring steel, and 24 M5×12×6 internal hex socket head cap screws and nuts. The overall dimensions are φ154.3×316mm, and the weight is approximately 7kg.
[0034] Both the 4-inch straight tube shielded module 300mm-A and 4-inch straight tube shielded module 300mm-B have a thickness of 16mm, including a 10mm middle functional layer and a 3mm outer layer. Their dimensions are both 80×150×316mm, and they weigh approximately 3.5kg. Each module has 18 pre-drilled holes for φ5mm M5×12×6 hexagonal socket head cap screws and nuts.
[0035] The 4-inch straight tube 300mm spring steel is divided into inner and outer layers, with an overall size of 260×80×0.6mm. It has 24 φ6mm mounting holes for installing M5×12×6 internal hexagon locknuts.
[0036] The 4-inch straight tube shielded module 300mm-A and the 4-inch straight tube shielded module 300mm-B are connected together by a 4-inch straight tube 300mm spring steel, and are locked on the outside by two 5cm×55cm Velcro straps.
[0037] Both the 4-inch straight tube shielding module 300mm-A and the 4-inch straight tube shielding module 300mm-B are designed with a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0038] like Figures 6-9 As shown, the 100mm 4-inch straight tube shielding module 2 includes one 4-inch straight tube shielding module 100mm-A, one 4-inch straight tube shielding module 100mm-B, one 5cm×55cm Velcro strap, one 4-inch straight tube 100mm spring steel, and 11 M5×12×6 internal hex socket head cap screws and nuts. The overall dimensions are φ154.3×116mm, and the weight is approximately 2.4kg.
[0039] Both the 4-inch straight tube shielded module 100mm-A and 4-inch straight tube shielded module 100mm-B have a thickness of 16mm, including a 10mm middle functional layer and a 3mm outer layer. Their dimensions are both 80×150×116mm, and they weigh approximately 1.2kg. Each module has seven pre-drilled holes for φ5mm M5×12×6 internal hexagonal lock screws and nuts.
[0040] The 4-inch straight tube 100mm spring steel is divided into inner and outer layers, with an overall size of 60×80×0.6mm. It has 9 φ6mm mounting holes for installing M5×12×6 internal hexagon lock screws and nuts.
[0041] The 4-inch straight tube shielded module 100mm-A and the 4-inch straight tube shielded module 100mm-B are connected together by a 4-inch straight tube 100mm spring steel, and are locked on the outside by a 5cm×55cm Velcro fastener.
[0042] Both the 4-inch straight tube shielding module 100mm-A and the 4-inch straight tube shielding module 100mm-B are designed with a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0043] like Figures 13-16 As shown, the 200mm 4-inch straight tube shielding module 4 consists of one 4-inch straight tube shielding module 200mm-A, one 4-inch straight tube shielding module 200mm-B, one 5cm×55cm Velcro strap, one 4-inch straight tube 200mm spring steel, and 17 M5×12×6 internal hexagon lock screws and nuts. The overall dimensions are φ154.3×216mm, and the weight is approximately 4.8kg.
[0044] Both the 4-inch straight tube shielded module 200mm-A and 4-inch straight tube shielded module 200mm-B have a thickness of 16mm, including a 10mm middle functional layer and a 3mm outer layer. Their dimensions are both 80×150×216mm, and they weigh approximately 2.4kg. Each module has 11 pre-drilled holes for φ5mm M5×12×6 internal hexagonal lock-locking screws and nuts.
[0045] The 4-inch straight tube with 200mm spring steel is divided into inner and outer layers, with overall dimensions of 160×80×0.6mm. It has 15 pre-drilled φ6mm mounting holes for installing M5×12×6 socket head cap screws and nuts.
[0046] The 4-inch straight tube shielded module 200mm-A and the 4-inch straight tube shielded module 200mm-B are connected together by a 4-inch straight tube 200mm spring steel, and are locked on the outside by a 5cm×55cm Velcro fastener.
[0047] Both the 4-inch straight tube shielding module 200mm-A and the 4-inch straight tube shielding module 200mm-B are designed with a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0048] like Figures 10-12 As shown, the 4-inch tube 90° elbow shielding module 3 includes one 4-inch tube 90° elbow shielding body A, one 4-inch tube 90° elbow shielding body B, and two 5cm×55cm Velcro straps. The overall dimensions are 242×225×154.3mm, and the weight is approximately 5.8kg.
[0049] Both the 4-inch tube 90° elbow shield A and 4-inch tube 90° elbow shield B are 16mm thick, including a 10mm middle functional layer and a 3mm outer layer. Their shape conforms to the design of GB / T12459-2000 4-inch 90° elbows, with dimensions of 242×225×74mm and a weight of approximately 2.9kg.
[0050] The 4-inch pipe 90° elbow shield A and 4-inch pipe 90° elbow shield B are fastened to the outside of the hot spot pipe with 5cm×55cm Velcro.
[0051] Both the 4-inch tube 90° elbow shield A and the 4-inch tube 90° elbow shield are designed in a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0052] like Figures 17-19 As shown, the 4-inch tube equal diameter tee shielding module 5 consists of one 4-inch tube tee shielding body A, one 4-inch tube tee shielding body B, and three 5cm×55cm Velcro straps. The overall dimensions are 154×294×229mm, and the weight is approximately 7.8kg.
[0053] Both 4-inch tube tee shielding body A and 4-inch tube tee shielding body B are 16mm thick, including a 10mm middle functional layer and a 3mm outer layer. Their dimensions are both 294×229×74mm, and they weigh approximately 3.9kg. The 4-inch pipe tee shield A and the 4-inch pipe tee shield B are secured to the outside of the hot spot pipe by three 5cm×55cm Velcro fasteners.
[0054] Both the 4-inch tube tee shield A and the 4-inch tube tee shield B are designed with a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0055] like Figures 23-24 As shown, the 300mm 2-inch straight tube shielding module 7 is an integrated strip structure. After being wrapped around the outside of the hot spot pipe, the joint is locked and fixed by Velcro. Specifically, it includes one 2-inch straight tube shielding body 300mm and two 5cm×40cm Velcro strips. The overall dimensions are φ98×316mm and the weight is about 4.3kg.
[0056] The 2-inch straight tube shield is 300mm thick and 16mm thick, including a 10mm middle functional layer and a 3mm outer layer, with external dimensions of φ94.3×316mm.
[0057] The 2-inch straight tube shield is designed in a wedge shape with a 300mm axial diameter and a pre-reserved bevel in the radial direction for easy installation and to prevent radiation leakage.
[0058] like Figures 28-29As shown, the 200mm 2-inch straight pipe shielding module 9 is an integrated strip structure. After being wrapped around the outside of the hot spot pipe, the joint is locked and fixed by Velcro. Specifically, it includes one 2-inch straight pipe shielding body 200mm and two 5cm×40cm Velcro strips. The overall dimensions are φ98×216mm and the weight is about 2.8kg.
[0059] The 2-inch straight tube shield is 200mm thick and 16mm thick, including a 10mm middle functional layer and a 3mm outer layer, with external dimensions of φ94.3×216mm.
[0060] The 2-inch straight tube shield is designed in a wedge shape with a 200mm axial diameter and a pre-reserved bevel in the radial direction for easy installation and to prevent radiation leakage.
[0061] like Figures 20-22 As shown, the 2-inch tube 90° elbow shielding module 6 includes one 2-inch tube 90° elbow shielding body A, one 2-inch tube 90° elbow shielding body B, and two 5cm×40cm Velcro straps. The overall dimensions are 145×145×94.3mm, and the weight is approximately 2.2kg.
[0062] Both the 2-inch tube 90° elbow shield A and 2-inch tube 90° elbow shield B have a thickness of 16mm, including a 10mm middle functional layer and a 3mm outer layer. The shape conforms to the design of GB / T12459-2000 2-inch 90° elbow, with external dimensions of 145×145×52mm and a weight of approximately 1.1kg.
[0063] The 2-inch pipe 90° elbow shield A and 2-inch pipe 90° elbow shield B are fastened to the outside of the hot spot pipe with 5cm×40cm Velcro.
[0064] Both the 2-inch tube 90° elbow shield A and the 2-inch tube 90° elbow shield are designed in a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0065] like Figures 26-27 As shown, the 2-inch tube 45° elbow shielding module 8 includes one 2-inch tube 45° elbow shielding body A, one 2-inch tube 45° elbow shielding body B, and two 5cm×40cm Velcro straps. The overall dimensions are 120×113×94.3mm, and the weight is approximately 1kg.
[0066] Both the 2-inch tube 45° elbow shield A and 2-inch tube 45° elbow shield B are 16mm thick, including a 10mm middle functional layer and a 3mm outer layer. Their shape conforms to the design of GB / T12459-2000 2-inch 45° elbows, with dimensions of 120×113×60mm and a weight of approximately 0.5kg.
[0067] The 2-inch pipe 45° elbow shield A and 2-inch pipe 45° elbow shield B are fastened to the outside of the hot spot pipe with 5cm×40cm Velcro.
[0068] Both the 2-inch tube 45° elbow shield A and the 2-inch tube 45° elbow shield are designed in a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0069] like Figures 33-34 As shown, the 120mm 1½-inch straight pipe shielding module 11 is an integral strip structure. After being wrapped around the outside of the hot spot pipe, the joint is locked and fixed by Velcro. Specifically, it includes one 1½-inch straight pipe shielding body 120mm and one 5cm×35cm Velcro, with an overall external size of φ86×136mm and a weight of about 1.4kg.
[0070] The 1.5-inch straight tube shield is 120mm thick and 16mm thick, including a 10mm middle functional layer and a 3mm outer layer, with external dimensions of φ82.3×136mm.
[0071] The 1.5-inch straight tube shield is designed with a wedge shape in the axial direction with a 120mm diameter and a pre-reserved bevel in the radial direction for easy installation and to prevent radiation leakage.
[0072] like Figures 35-36 As shown, the 300mm 1½-inch straight pipe shielding module 12 is an integrated strip structure. After being wrapped around the outside of the hot spot pipe, the joint is locked and fixed by Velcro. Specifically, it includes one 1½-inch straight pipe shielding body 300mm and two 5cm×35cm Velcro strips. The overall dimensions are φ86×316mm and the weight is about 3.6kg.
[0073] The 1½-inch straight tube shield is 300mm thick and 16mm thick, including a 10mm middle functional layer and a 3mm outer layer, with external dimensions of φ82.3×316mm.
[0074] The 1½-inch straight tube shield is designed in a wedge shape with a 300mm axial diameter and a pre-reserved bevel in the radial direction for easy installation and to prevent radiation leakage.
[0075] like Figures 30-32 As shown, the 1½-inch tube 90° elbow shielding module 10 includes one 1 1 / 2-inch tube 90° elbow shielding body A, one 1 1 / 2-inch tube 90° elbow shielding body B, and two 5cm×35cm Velcro straps. The overall dimensions are 114×114×82.3mm, and the weight is approximately 1.4kg.
[0076] Both the 1½-inch tube 90° elbow shield A and 1½-inch tube 90° elbow shield B are 16mm thick, including a 10mm middle functional layer and a 3mm outer layer. Their shape conforms to the design of GB / T12459-20001 ½-inch 90° elbows, with dimensions of 114×114×45mm and a weight of approximately 0.7kg.
[0077] The 1½-inch pipe 90° elbow shield A and 1½-inch pipe 90° elbow shield B are fastened to the outside of the hot spot pipe with 5cm×35cm Velcro.
[0078] Both the 1½-inch tube 90° elbow shield A and the 1½-inch tube 90° elbow shield are designed in a wedge shape in both the axial and radial directions to prevent radiation leakage.
[0079] In terms of performance design, it has the following advantages: (1) Design of radiation shielding performance The shielding performance of natural rubber-based shielding devices depends primarily on the thickness of the intermediate functional layer of the shielding module. Based on the radioactive source terms and intensity of radiation sources in pipelines within nuclear power plants with strong radiation fields, Monte Carlo software and traditional formula calculation methods are used to perform relevant shielding calculations. The design thickness of the shielding module is determined while meeting the relevant radiation control regulations for nuclear power plants.
[0080] The shielding module can be designed in different sizes according to the site environment, which is conducive to the on-site installation and disassembly of the shielding device and saves the on-site operation time of the shielding device.
[0081] (2) Safety design The weight of the natural rubber-based shielding device is much less than that of the pipe, and the shielding module is fixed to the outside of the pipe with multiple Velcro straps, which enhances the safety and reliability of the shielding device.
[0082] (3) Design for convenience The components of the natural rubber-based shielding device are designed as a single unit, making it easy to store and use.
[0083] All components of the natural rubber-based shielding device are designed to standard specifications, allowing for flexible combination and easy installation.
[0084] Natural rubber-based shielding devices are mainly composed of shielding modules, spring steel, and Velcro. The shielding assembly is placed in a specific storage box, which occupies little space and is convenient for transportation.
[0085] When installing natural rubber-based shielding devices, it is necessary to refer to the site environment to determine the starting position for installation, and then install the shielding assembly in sequence. The operation is very convenient.
[0086] Natural rubber-based shielding devices are easy to install and operate. Operators can master the installation requirements after simple training, and the radiation shielding work is highly effective.
[0087] (4) Design in terms of economy and versatility Natural rubber-based shielding devices require no regular or irregular maintenance after installation, effectively reducing workers' working hours and workload, significantly lowering radiation levels at the work site, reducing unnecessary radiation doses, and saving resource costs.
[0088] To further understand the present invention, the natural rubber-based shielding device provided by the present invention will be described in detail below with reference to the embodiments. The scope of protection of the present invention is not limited by the following embodiments.
[0089] Example 1 The installation effect of natural rubber-based shielding equipment and various shielding components, such as Figures 1-36 As shown, the installation steps are as follows: Step 1: Based on the site environment of the hotspot, confirm the installation quantity and location of each shielding assembly; Specifically, the scope of shielding equipment is determined based on the spatial location of the pipeline's radioactive hotspot, the size of the radioactive source term, the required shielding effect, and the affected area, and a design scheme for a natural rubber-based shielding device is determined.
[0090] The thickness and number of shielding devices are determined based on the dose rate level of the hotspot pipeline, the expected dose rate level, the load-bearing capacity of the pipeline, and the shielding performance data of the shielding material.
[0091] Step 2: Take 20 4-inch straight tube shielded modules 300mm-A, 20 4-inch straight tube shielded modules 300mm-B, 20 sets of 4-inch straight tube 300mm spring steel, 480 M5×12×6 hex socket head cap screws and nuts, and 40 5cm×55cm Velcro straps, as per the instructions. Figures 2-5 20 sets of 300mm 4-inch straight tube shielded modules were assembled. Step 3: Take 6 x 4-inch straight tube shielded modules 100mm-A, 6 x 4-inch straight tube shielded modules 100mm-B, 6 sets of 4-inch straight tube 100mm spring steel, 66 M5×12×6 hex socket head cap screws and nuts, and 6 x 5cm×55cm Velcro straps, as per the instructions. Figures 6-9 Six sets of 100 mm 4-inch straight tube shielded modules were assembled. Step 4: Take two 4-inch straight tube shielded modules (200mm-A), two 4-inch straight tube shielded modules (200mm-B), two sets of 4-inch straight tube spring steel (200mm), 34 M5×12×6 hex socket head cap screws and nuts, and two 5cm×55cm Velcro straps, as per [reference needed]. Figures 13-16 Two sets of 200mm 4-inch straight tube shielded modules were assembled. Step 5: Take 7 4-inch tube 90° elbow shielding bodies A, 7 4-inch tube 90° elbow shielding bodies B, and 14 5cm×55cm Velcro straps, refer to... Figures 10-12 Seven sets of 4-inch pipe 90° elbow shielding modules were assembled. Step 6: Take three 4-inch tube tee shields (A), three 4-inch tube tee shields (B), and three 5cm x 55cm Velcro straps, and refer to... Figures 17-19 Three sets of 4-inch equal diameter tee shielded modules have been assembled. Step 7: Take two 2-inch pipe 90° elbow shields (A), two 2-inch pipe 90° elbow shields (B), and four 5cm x 40cm Velcro straps, referring to... Figures 20-22 Two sets of 2-inch pipe 90° elbow shielding modules have been assembled. Step 8: Take 5 x 2-inch straight tube shields (300mm each) and 10 x 5cm x 40cm Velcro straps, refer to... Figures 23-24 Five sets of 300mm 2-inch straight tube shielded modules were assembled. Step 9: Take one 2-inch pipe 45° elbow shield A, one 2-inch pipe 45° elbow shield B, and two 5cm×40cm Velcro straps, refer to... Figures 25-27 Two sets of 2-inch pipe 45° elbow shielding modules have been assembled. Step 10: Take two 2-inch straight tube shields (200mm each) and four 5cm x 40cm Velcro straps, refer to... Figures 28-29 Two sets of 200mm 2-inch straight tube shielded modules were assembled. Step 11: Take two 1.5-inch pipe 90° elbow shields (A), two 1.5-inch pipe 90° elbow shields (B), and four 5cm x 35cm Velcro straps, and refer to... Figures 30-32 Two sets of 1½-inch pipe 90° elbow shielding modules were assembled. Step 12: Take one 1.5-inch straight tube shield (120mm) and one 5cm×35cm Velcro strap, and assemble one 120mm 1.5-inch straight tube shield module 11 according to Figures 33~34; Step 13: Take 5 x 1.5-inch straight tube shields (300mm each) and 10 x 5cm x 35cm Velcro straps, and assemble 5 sets of 300mm x 1.5-inch straight tube shield modules 12 according to Figures 35-36. Step 14: Install the starting position shielding module according to the starting position confirmed in Step 1; Step 15: Install the remaining shielding modules in order from left to right and from top to bottom. Wrap the shielding modules directly around the hotspot pipe and lock them in place with Velcro on the outside. Step 16: After installation, check for any leaks or gaps and ensure the Velcro is secure.
[0092] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A natural rubber-based shielding device, characterized in that, Modules of different sizes are made of shielding material, and different shielding assemblies are formed according to the different shapes of hotspot pipelines; The shielding material includes an intermediate functional layer and an outer layer disposed on both sides of the intermediate functional layer. The outer layer is made of silicone, and the intermediate functional layer is made of lead rubber. The shielding assembly includes: shielding modules of different lengths of 4-inch straight pipe, shielding modules of 4-inch pipe 90° elbow, shielding modules of 4-inch pipe equal diameter tee, shielding modules of different lengths of 2-inch straight pipe, shielding modules of 2-inch pipe 90° elbow, shielding modules of 2-inch pipe 45° elbow, shielding modules of different lengths of 1½-inch straight pipe, and shielding modules of 1½-inch pipe 90° elbow. All modules are assembled to form a complete tubular outer wall.
2. The natural rubber-based shielding device according to claim 1, characterized in that, The intermediate functional layer includes the following components: Natural rubber: 60-80 parts; Nano boron carbide: 5-15 parts; Nano-high density metal powder: 15-23 parts; Modified gadolinium oxide: 3-10 parts; Plasticizer: 3-8 parts; Vulcanizing agent: 1-3 parts; Accelerator: 0.5-2 parts; Anti-aging agent: 1-2 parts.
3. The natural rubber-based shielding device according to claim 2, characterized in that, The method for preparing the modified gadolinium oxide is as follows: Gadolinium oxide powder was dispersed in an organic solvent, and a silane coupling agent was added. The mixture was stirred and reacted to allow the active groups in the silane coupling agent molecules to react chemically with the hydroxyl groups on the surface of gadolinium oxide, forming an organic molecular coating layer on the surface of gadolinium oxide, thus obtaining modified gadolinium oxide.
4. The natural rubber-based shielding device according to claim 2, characterized in that, The high-density nano metal powder is high-purity nano lead powder or tungsten powder. The particle size of the high-density nano metal powder is 50~200nm; The particle size of the boron carbide nanoparticles is 50~200nm.
5. The natural rubber-based shielding device according to claim 1, characterized in that, The 4-inch straight tube shielding module is divided into two arc-shaped parts, which are connected by spring steel to form a complete outer wall, and the outer side is locked with Velcro. The two arc-shaped sections are wedge-shaped in both the axial and radial directions.
6. The natural rubber-based shielding device according to claim 1, characterized in that, The 4-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 4-inch pipe equal diameter tee shielding module is divided into two parts, which are locked and fixed to the outside of the hot spot pipe with Velcro.
7. The natural rubber-based shielding device according to claim 1, characterized in that, The 2-inch straight pipe shielding module is an integrated strip structure. After being wrapped around the outside of the hot spot pipe, the joint is locked and fixed by Velcro. The axial direction is wedge-shaped, and a bevel is reserved in the radial direction; The structure of the 1½-inch straight tube shielded module is the same as that of the 2-inch straight tube shielded module.
8. The natural rubber-based shielding device according to claim 1, characterized in that, The 2-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 2-inch pipe 45° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. The 1½-inch pipe 90° elbow shielding module is divided into two parts, which are fastened to the outside of the hot spot pipe by Velcro. Both parts are designed in a wedge shape in both the axial and radial directions.
9. The natural rubber-based shielding device according to claim 1, characterized in that, The thickness of each shielding module is 16~20mm.
10. The natural rubber-based shielding device according to claim 1, characterized in that, The shielding assembly includes three 4-inch straight tube shielding modules of lengths of 300mm, 100mm and 200mm, two 2-inch straight tube shielding modules of lengths of 300mm and 200mm, and two 1½-inch straight tube shielding modules of lengths of 120mm and 300mm.