Radiation shielding device for reactor duct location

Abstract

The present invention discloses a radiation shielding device for a reactor channel position, which comprises a shielding layer, an outer supporting frame and an inner supporting frame; the shielding layer is sealed at the channel exit position of the structure, the inner supporting frame is fixed in the channel of the structure, and the outer supporting frame is fixed on the outer facade around the channel exit of the structure; the shielding layer is located between the inner supporting frame and the outer supporting frame, and the inner and outer sides of the shielding layer are supported and limited by the inner supporting frame and the outer supporting frame respectively. Compared with the prior art, the radiation shielding device for a reactor channel position of the present invention can enhance the shielding effect of the nuclear reactor pipeline position, and ensure that the external radiation dose received by personnel and equipment is lower than the design target value.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear radiation shielding, and more specifically, the present invention relates to a radiation shielding device used in a reactor channel. Background Art

[0002] During the operation of a nuclear power plant, neutrons and photons generated by sources such as the core will have an adverse effect on surrounding equipment and personnel. After a long period of accumulation, they will form irradiation hot spots that are difficult to remove. From the perspective of near-source shielding, setting up a shielding structure near the core or near the source can reduce the impact of source items on the peripheral area during power operation, significantly reduce the dose rate, and thus reduce the irradiation dose to personnel and equipment.

[0003] The existing nuclear reactor pipeline location is not equipped with a radiation shielding device, which poses a risk of radiation exposure to personnel and equipment, and is not conducive to reducing the radiation dose to personnel and equipment. Therefore, it is indeed necessary to provide a radiation shielding device for the reactor channel location. Summary of the invention

[0004] The object of the present invention is to provide a radiation shielding device for use at a reactor channel position to enhance the radiation shielding effect and reduce the radiation dose of personnel and equipment.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a radiation shielding device for use in a reactor channel position, which includes a shielding layer, an outer support frame and an inner support frame; the shielding layer is sealed at the channel outlet position of the structure, the inner support frame is fixed in the channel of the structure, and the outer support frame is fixed on the outer facade around the channel outlet of the structure; the shielding layer is located between the inner support frame and the outer support frame, and the inner and outer sides of the shielding layer are supported and limited by the inner support frame and the outer support frame respectively.

[0006] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, a pipeline passes through the channel of the structure, and the shielding layer, the outer support frame and the inner support frame are all arranged around the outer peripheral wall of the pipeline, and the shielding layer completely blocks the gap between the outer peripheral wall of the pipeline and the channel of the structure.

[0007] As a preferred embodiment of the radiation shielding device for the reactor channel position of the present invention, the shielding layer includes one or more shielding module layers, each shielding module layer is formed by splicing multiple shielding modules in an overlapping or miter manner; when the shielding layer includes multiple shielding module layers, adjacent shielding module layers are staggered.

[0008] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the main bodies of the outer support frame and the inner support frame are both spliced ​​with steel sections and / or plates, and the splicing methods include welding and detachable mechanical connection, wherein the outer support frame and the inner support frame are both detachable mechanically connected at the channel position, and the splicing method between the shielding modules located at the channel position in the shielding layer is a detachable connection.

[0009] As a preferred embodiment of the radiation shielding device for use at the reactor channel position of the present invention, each shielding module includes a stainless steel box body and shielding material filled in the stainless steel box body.

[0010] As a preferred embodiment of the radiation shielding device for the reactor channel position of the present invention, the stainless steel box body is provided with a quick-release buckle and a handle. The quick-release buckle is used to connect adjacent shielding modules to form a whole, and the handle is used for on-site installation and removal during in-service inspection.

[0011] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the radiation shielding device also includes a lower support supported on the bottom of the outer support frame; the outer support frame includes a plurality of support frames connected together and a bottom cladding box body, and the plurality of support frames are respectively welded to the structure or the inner support frame, and some of the support frames are locked to the adjacent structure in a detachable mechanical connection manner; the bottom cladding box body is a box body structure with an open side formed by welding of plate materials, and its lower part is connected to the secondary height adjustment structure of the lower support, and is used for the installation of the outermost shielding module layer of the shielding layer.

[0012] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the lower support is used for the installation height adjustment and bottom support of the outer support frame, including a lower support beam, a height adjustment platform, a bottom support angle steel and a secondary height adjustment structure; the lower support beam is the main bearing structure, used to support the dead weight of the radiation shielding device, the lower support beam is prefabricated from steel plates, and is connected to the structure on site by welding; the height adjustment platform is formed by welding of steel plates, which is connected to the lower support beam by welding, and is used to adjust the installation height of the radiation shielding device; the bottom support angle steel is a plate shell structural member, used for auxiliary support; the secondary height adjustment structure is connected to the height adjustment platform, and is used for leveling the outer support frame.

[0013] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the inner support frame includes an inner circumferential frame of the channel, a T-plate, a connecting plate, an inner support ring and an inner support frame of the channel; the inner circumferential frame of the channel is welded by channel steel or plates, and is connected to the embedded parts in the structure; the T-plate is connected between the inner circumferential frame of the channel and the inner support ring, and is used for rooting and adjusting the installation position of the inner support ring; the connecting plate is used for auxiliary fixation of the inner support ring, one end of which is welded to the inner circumferential frame of the channel, and the other end is welded to the inner support ring; the inner support ring is a plate and shell support member, which is used for complete positioning of the shielding layer and strengthening the stability and integrity of the shielding module at the middle pipe penetration.

[0014] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the inner support frame also includes multiple channel inner support frames and plug blocks; the channel inner support frames are all welded from steel sections or plates, and are used for local reinforcement of the inner support of the shielding layer, and the two ends of the channel inner support frames are detachably mechanically connected to the inner circumferential frame of the channel to form a personnel passage; the plug blocks are welded from plates and welded to the inner circumferential frame of the channel to provide an installation interface for the channel inner support frames.

[0015] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the inner support frame also includes a limit plate, which is used to limit the inner side of the circumferential frame in the channel, and the installation position of the radiation shielding device can be adjusted through on-site fitting; the limit plate is welded to the embedded parts, and connecting pins are added to enhance the structural strength.

[0016] As a preferred embodiment of the radiation shielding device used for the reactor channel position of the present invention, the inner support frame also includes an inner channel support angle bracket, which is a plate shell support member, which is welded to the inner circumferential frame of the channel and is used to provide auxiliary support for the suspended part of the radiation shielding device.

[0017] Compared with the prior art, the radiation shielding device used for the reactor channel position of the present invention can enhance the shielding effect of the nuclear reactor pipeline position, ensuring that the external radiation dose received by personnel and equipment is lower than the design target value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The radiation shielding device for the reactor channel position of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the radiation shielding device used for the reactor channel position of the present invention.

[0020] Figure 2 The figure is a front view of the radiation shielding device used for the reactor channel position of the present invention.

[0021] Figure 3 It is a side cross-sectional view of the radiation shielding device used for the reactor channel position of the present invention.

[0022] Figure 4 It is a top cross-sectional view of the radiation shielding device used for the reactor channel position of the present invention.

[0023] Figure 5 It is a rear view of the inner side support frame of the radiation shielding device used in the reactor channel position of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0025] See also Figure 1-5 The radiation shielding device for the reactor channel position of the present invention comprises a shielding layer 3, an outer support frame 2 and an inner support frame 4. The shielding layer 3 is sealed at the channel outlet of the structure, the inner support frame 4 is fixed in the channel of the structure, and the outer support frame 2 is fixed on the outer facade around the channel outlet of the structure; the shielding layer 3 is located between the inner support frame 4 and the outer support frame 2, and the inner and outer sides of the shielding layer 3 are supported and limited by the inner support frame 4 and the outer support frame 2 respectively. According to the specific installation situation, the radiation shielding device for the reactor channel position of the present invention may also include a lower support 1 supported at the bottom of the outer support frame 2.

[0026] When the radiation shielding device of the present invention is used to block the hole of a structure through which a pipe passes, the shielding layer 3, the outer support frame 2 and the inner support frame 4 are all arranged around the outer peripheral wall of the pipe, and the shielding layer 3 completely blocks the gap between the outer peripheral wall of the pipe and the hole of the structure. Although the radiation shielding device in the illustrated embodiment is used to block the hole of a structure through which a pipe passes, it is easy to understand that the radiation shielding device of the present invention can also be used to block the hole of a structure through which no pipe passes, as long as no pipe hole is reserved in the shielding layer 3, and the relevant structures specially provided for the pipe hole on the outer support frame 2 and the inner support frame 4 are cancelled.

[0027] The following will be combined with the attached Figure 1-5 , the structures of the shielding layer 3, the outer supporting frame 2, the inner supporting frame 4 and the lower support 1 are described in detail.

[0028] The shielding layer 3 is the main structure of the radiation shielding device to achieve the shielding function. The number of shielding module layers included in the shielding layer 3 can be set according to the source term characteristics and shielding efficiency requirements. For example, Figure 3-4 In the illustrated embodiment, the shielding layer 3 is composed of three shielding module layers, namely, the shielding inner layer 301, the shielding middle layer 302 and the shielding outer layer 303. Each shielding module layer is composed of a plurality of shielding modules, each of which includes a stainless steel box body and a shielding material filled in the stainless steel box body. Based on the difference in source terms, different types of shielding materials can be used for neutron shielding, gamma shielding or both. The manufacturing process of the shielding module is to weld the stainless steel plates together to form a box body with one side open, fill the shielding material inside, and then seal the cover plate. The box body welding can also be completed, leaving only one side with a hole, and the shielding material is poured through the hole. All welds of the stainless steel box body are continuous and fully penetrated welds. At the same time, according to the characteristics of the shielding material, an air hole can be selectively reserved at a suitable position of the stainless steel box body for balancing the pressure difference. In addition, a quick-release buckle and a handle are provided at a suitable position of the stainless steel box body. The quick-release buckle is used to connect adjacent shielding modules to form a whole to enhance stability; the handle is for the convenience of on-site installation and removal during in-service inspection. The shielding material filled inside the shielding module can be filled with different types of shielding materials according to the characteristics of the source item. The same shielding module can be filled with a single shielding material or different shielding materials. Shielding modules in different areas of the same shielding module layer can be filled with the same shielding material or different shielding materials. The shielding modules of the same shielding module layer are spliced ​​by overlapping or beveling to effectively reduce leakage beams; when the shielding layer includes multiple shielding module layers, adjacent shielding module layers are staggered, that is, the shielding modules of adjacent shielding module layers are staggered in all directions, and there is no gap alignment, so it can effectively reduce through-leakage beams. Shielding layer 3 can reserve pipe holes according to the actual pipe system layout requirements to ensure the normal layout of the pipe system.

[0029] The main body of the outer support frame 2 is made of steel sections and / or plates, and is used for supporting and limiting the outer side of the shielding layer 3. The specific splicing method is flexibly determined according to actual needs, and is mainly welding and detachable mechanical connection. Among them, the outer support frame 2 adopts detachable mechanical connection in the equipment repair and maintenance work space, including personnel passages and other locations. In the illustrated embodiment, the outer support frame 2 includes a plurality of support frames connected together and a bottom covering box body 212. The plurality of support frames are respectively welded to the structure or the inner support frame, and some of the support frames are locked with the adjacent structure in a detachable mechanical connection. Among them, angle steel 201, angle steel 202, angle steel 203, angle steel 204, angle steel 207, angle steel 209, and angle steel 210 are welded with steel sections and / or plates, and are used for limiting the outer side of the shielding layer 3. They are mainly welded to the structure or The inner support frame 4 is welded and connected. Considering the module disassembly problem, some positions are locked with adjacent structures by bolts or the like in a detachable mechanical connection mode, wherein the angle steel 204 is welded and connected with the structure, and the angle steels 202 and 209 are connected with the inner support frame 4 by welding; the brackets 205, 206, 208, and 211 are welded by section steel or plates, and locked with adjacent structures by bolts or the like in a detachable mechanical connection mode, which are used to limit the outer side of the shielding layer 3 and ensure that the shielding layer can be flexibly disassembled. The bottom covering box body 212 is welded by plates to form a box body structure with one side open. The lower part of the bottom covering box body 212 is welded and connected with the inclined pad 104 of the lower support 1, which is used for the installation of the outermost shielding module layer of the shielding layer 3. Small plates are arranged around the bottom covering box body 212 to provide installation positions for the support frame. The bottom covering box body 212 can ensure the installation stability of the shielding module of the shielding layer 3, and effectively prevent it from shifting and other problems under accident conditions.

[0030] The lower support 1 is used for adjusting the installation height and bottom support of the outer support frame 2, including a lower support beam 101, a height adjustment platform 102, a bottom support angle steel 103 and a secondary height adjustment structure. The lower support beam 101 is prefabricated from steel plates and connected to the structure on site by welding, and full penetration welds are used at the connection. The lower support beam 101 is the main bearing structure, used to support the deadweight of the radiation shielding device. The height adjustment platform 102 is formed by welding of steel plates, all welds are full penetration welds, and is connected to the lower support beam 101 by welding. It is mainly used to adjust the installation height of the radiation shielding device. At the same time, the height adjustment platform 102 can be expanded according to actual needs to provide a work station for on-site workers to facilitate the installation work. The bottom support angle steel 103 is a plate shell structural member used for auxiliary support. The secondary height adjustment structure is connected to the height adjustment platform 102 by welding, mainly used for leveling the outer support frame 2, and an inclined washer 104 can be used.

[0031] The main body of the inner support frame 4 is made of steel and / or plate, which is used for supporting and limiting the inner side of the shielding layer 3. The specific splicing method is flexibly determined according to actual needs, mainly welding and detachable mechanical connection; wherein, the inner support frame 4 adopts detachable mechanical connection in the equipment repair and maintenance operation space, including personnel passages and other locations. In the illustrated embodiment, the inner support frame 4 mainly includes the inner circumferential frame 401 of the channel, T-shaped plate 402, connecting plate 403, inner support ring 404, inner support frame 405 of the channel, inner support frame 406 of the channel, limiting plate 407, inner support angle frame 408 of the channel and plug 409. The inner circumferential frame 401 of the channel is welded by profiles such as channel steel, and can also be directly welded by plate. It is connected to the embedded parts in the structure by welding, and can also be equipped with holes on site and mechanically connected by bolts. The inner circumferential frame 401 of the hole is one of the main bearing components inside the radiation shielding device, and the radiation shielding device is limited and fixed from the inside. The T-shaped plate 402 is welded by plate materials, and is connected to the inner circumferential frame 401 of the hole by welding after on-site assembly, and is used for the installation and rooting of the inner support ring 404 and the adjustment of the installation position. The inner support ring 404 can be locked with the T-shaped plate 402 through mechanical connection. The connecting plate 403 is used for auxiliary fixation of the inner support ring 404, and is machined from plate materials. One end of the connecting plate is welded to the inner circumferential frame 401 of the hole, and the other end is welded to the inner support ring 404. The inner support ring 404 is a plate shell support member, which is used for the complete positioning of the modular shielding layer 3 and strengthening the stability and integrity of the shielding module at the middle pipe penetration. The inner support frames 405 and 406 of the hole are welded by steel sections or plates, and are used for local reinforcement of the inner support of the shielding layer 3. The two ends of the support frames 405 and 406 in the channel are mechanically connected to the inner circumferential frame 401 in the channel and can be disassembled to form necessary spaces such as personnel passages. The plug block 409 is welded from plates and welded in the inner circumferential frame 401 in the channel to provide an installation interface for the support frame 406 in the channel. The limit plate 407 is used to limit the inner side of the inner circumferential frame 401 in the channel. The limit plate can be installed on site to adjust the installation position of the radiation shielding device; the limit plate is welded to the embedded part. Considering the stress condition of the weld connecting the limit plate 407 and the embedded part, a connecting pin is added to strengthen the structural strength. The support angle frame 408 in the channel is a plate shell support, which is welded to the inner circumferential frame 401 in the channel and is used to provide auxiliary support for the suspended part of the radiation shielding device.

[0032] It can be seen that the radiation shielding device used in the reactor channel position of the present invention adopts a modular detachable structure design to meet the space requirements of the later in-service inspection stage. The front detachable structure ensures strength while providing a passage for the staff. At the same time, the present invention reserves a pipeline channel in the middle, connects with the basic structure on all sides, and adds steel structure inner and outer support frames to solve the support and positioning of the shielding layer, ensuring the shielding effect and stability of the shielding layer.

[0033] The installation process of the radiation shielding device used for the reactor duct position of the present invention is as follows:

[0034] 1) Install the lower support beam 101 and the height adjustment platform 102. The height adjustment platform 102 can provide a working platform for the staff. The actual height of the height adjustment platform 102 is determined according to the measured data.

[0035] 2) Install the inner support frame 4 in the structure channel.

[0036] 3) After the installation and positioning of the inner support frame 4 is completed, the shielding layer 3 is installed layer by layer by personnel or equipment lifting. Before installing the outermost shielding module layer (i.e., the shielding outer layer 303 in the figure), the bottom support angle steel 103 of the lower support 1, the secondary height adjustment structure and the bottom covering box body 212 of the outer support frame 2 should be installed first, and the horizontality and installation height of the bottom covering box body 212 should be adjusted by the secondary height adjustment structure to ensure that the installation surface of the outermost shielding module layer is level. After the bottom covering box body 212 is in place, the outermost shielding module layer is installed to complete the installation of all shielding layers 3.

[0037] 4) After all shielding layers 3 are installed, install the outer support frame 2. So far, the installation of the entire radiation shielding device has been completed.

[0038] From the above description, it can be seen that the radiation shielding device used for the reactor channel position of the present invention can enhance the shielding effect of the nuclear reactor pipeline position, ensuring that the external radiation dose to personnel and equipment is lower than the design target value.

[0039] Compared with the prior art, the present invention has at least the following advantages:

[0040] (1) Effectively protect personnel and equipment to ensure that the external radiation dose received by personnel is lower than the design target value;

[0041] (2) The shielding layer is modularized to effectively utilize space and realize near-source shielding and special-shaped layout;

[0042] (3) The modular detachable structure design of the outer support frame and the inner support frame can realize overall or partial disassembly, reserving space or personnel passage for equipment maintenance and in-service inspection, meeting the requirements of equipment maintenance and repair work space or personnel passage;

[0043] (4) The overall structure of the device is simple, easy to install, highly reliable and has good functionality;

[0044] (5) The shielding layer 3 is composed of a plurality of shielding modules, and the shielding modules are overlapped modules or beveled modules to minimize beam leakage;

[0045] (6) The shielding material of the shielding module can be flexibly selected according to different shielding source items. The external covering shell of the shielding module ensures the structural strength and can be used for neutron or gamma shielding, and can also be used in high temperature or high humidity environments;

[0046] (7) The on-site installation and construction workload is small, and it can be applied to the engineering renovation of operating units and the supporting construction of new units, with good adaptability;

[0047] (8) Multi-level precision adjustment provides an operating platform for construction workers to operate more conveniently;

[0048] (9) The modular layout structure can flexibly handle the complex industrial environment of the hot spot area to be shielded.

[0049] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A radiation shielding device for a reactor duct, characterized in that: It comprises a shielding layer, an outer supporting frame and an inner supporting frame; the shielding layer is sealed at the exit of the structure duct, the inner supporting frame is fixed in the structure duct, and the outer supporting frame is fixed on the outer facade around the exit of the structure duct; the shielding layer is located between the inner supporting frame and the outer supporting frame, and the inner side and the outer side of the shielding layer are supported and limited by the inner supporting frame and the outer supporting frame respectively; Wherein, the radiation shielding device also includes a lower support supported at the bottom of the outer support frame; the outer support frame includes a plurality of support frames connected together and a bottom covering box body, the plurality of support frames are respectively welded to the structure or the inner support frame, and some of the support frames are locked with the adjacent structure in a detachable mechanical connection manner; the bottom covering box body is a box body structure with one side open formed by welding of plate materials, the lower part of which is connected to the secondary height adjustment structure of the lower support, and is used for the installation of the outermost shielding module layer of the shielding layer; The lower support is used for adjusting the installation height and bottom support of the outer support frame, and includes a lower support beam, a height adjustment platform, a bottom support angle steel and a secondary height adjustment structure; the lower support beam is the main load-bearing structure, used to support the deadweight of the radiation shielding device, and the lower support beam is prefabricated from steel plates and connected to the structure on site by welding; the height adjustment platform is formed by welding of steel plates, which is connected to the lower support beam by welding and is used to adjust the installation height of the radiation shielding device; the bottom support angle steel is a plate-shell structural member, used for auxiliary support; the secondary height adjustment structure is connected to the height adjustment platform and is used for leveling the outer support frame.

2. The radiation shielding device for use at a reactor duct location according to claim 1, characterized in that: A pipeline passes through the hole of the structure, and the shielding layer, the outer supporting frame and the inner supporting frame are all arranged around the outer peripheral wall of the pipeline. The shielding layer blocks the gap between the outer peripheral wall of the pipeline and the hole of the structure.

3. The radiation shielding device for use at a reactor duct location according to claim 1 or 2, characterized in that: The shielding layer includes one or more shielding module layers, each of which is formed by splicing a plurality of shielding modules in an overlapping or beveled manner; when the shielding layer includes multiple shielding module layers, adjacent shielding module layers are staggered.

4. The radiation shielding device for use at a reactor duct location according to claim 3, characterized in that: The main bodies of the outer support frame and the inner support frame are both made of steel sections and / or plates, and the splicing methods include welding and detachable mechanical connection. Among them, the outer support frame and the inner support frame both adopt detachable mechanical connection at the channel position, and the splicing method between the shielding modules located at the channel position in the shielding layer is detachable connection.

5. The radiation shielding device for use at a reactor duct location according to claim 3, characterized in that: Each shielding module includes a stainless steel box body and shielding materials filled in the stainless steel box body.

6. The radiation shielding device for use at a reactor duct location according to claim 5, characterized in that: The stainless steel box body is provided with a quick-release buckle and a handle. The quick-release buckle is used to connect adjacent shielding modules to form a whole, and the handle is used for on-site installation and removal during in-service inspection.

7. The radiation shielding device for use at a reactor duct location according to claim 2, characterized in that: The inner support frame includes an inner circumferential frame of the channel, a T-plate, a connecting plate, an inner support ring and an inner support frame of the channel; the inner circumferential frame of the channel is welded by channel steel or plates, and is connected to the embedded parts in the structure; the T-plate is connected between the inner circumferential frame of the channel and the inner support ring, and is used for rooting and adjusting the installation position of the inner support ring; the connecting plate is used for auxiliary fixation of the inner support ring, one end of which is welded to the inner circumferential frame of the channel, and the other end is welded to the inner support ring; the inner support ring is a plate and shell support component, which is used for the complete positioning of the shielding layer and enhances the stability and integrity of the shielding module at the middle pipe penetration.

8. The radiation shielding device for use at a reactor duct location according to claim 7, characterized in that: The inner support frame also includes multiple inner channel support frames and plug blocks; the inner channel support frames are all welded from steel sections or plates, and are used for local reinforcement of the inner support of the shielding layer. The two ends of the inner channel support frames are detachably mechanically connected to the inner circumferential frame of the channel to form a personnel passage; the plug blocks are welded from plates and welded to the inner circumferential frame of the channel to provide an installation interface for the inner channel support frames.

9. The radiation shielding device for use at a reactor duct location according to claim 7, characterized in that: The inner support frame also includes a limit plate, which is used to limit the inner side of the circumferential frame in the channel, and the installation position adjustment of the radiation shielding device can be achieved through on-site installation; the limit plate is welded to the embedded parts, and connecting pins are added to enhance the structural strength.

10. The radiation shielding device for use at a reactor duct location according to claim 7, characterized in that: The inner support frame also includes an inner channel support angle bracket, which is a plate shell support member, which is welded to the inner circumferential frame of the channel and is used to provide auxiliary support for the suspended part of the radiation shielding device.

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