Reactor radiation shielding device

Abstract

The present application relates to a kind of reactor radiation shielding device, it includes the shielding base being arranged on shielding structure, and openable and closable shielding door;Shielding base includes multiple mutually spliced shielding units;One of shielding units is formed with the pipe avoidance hole for pipe to pass through;One of shielding units is formed with the door hole for personnel and equipment to pass through;Or multiple shielding units form the door hole for personnel and equipment to pass through together;Shielding door is set on shielding base corresponding door hole.In shielding structure, shielding base is built, can replace the shielding wall needing to be repeatedly disassembled in prior art, and the passing requirement of personnel and equipment is relied on openable and closable shielding door to be satisfied, so that the work of repeatedly disassembling shielding wall is saved, and the influence of radioactive radiation to personnel is reduced.In addition, multiple shielding units are spliced with each other, so that shielding base as a whole has the modularization characteristics, is convenient for transportation, on-site construction and installation, can effectively utilize the narrow space on site, and has better feasibility.

Description

Technical Field

[0001] This invention relates to the field of nuclear industry design and manufacturing technology, and in particular to a reactor radiation shielding device. Background Technology

[0002] During nuclear power plant operation, neutrons and photons generated by source terms such as the reactor core can adversely affect surrounding equipment and personnel. Over time, these can accumulate and form irradiation hotspots that are difficult to remove. From the perspective of near-source shielding, installing shielding structures near the reactor or near the source can reduce the impact of source terms on the surrounding area during power operation, significantly reduce the dose rate, and thus reduce the radiation dose to personnel and equipment.

[0003] The existing shielding structures within a nuclear power plant are located between the reactor buildings, serving as walls to separate the building spaces. Each shielding structure has a civil engineering opening. Generally, after reactor auxiliary structures such as pipes pass through this opening, the remaining area provides a passage for personnel and equipment. In existing technology, while providing passage for personnel and equipment, radiation shielding functionality must also be considered at other times. Typically, a removable shielding wall is installed on the portion of the civil engineering opening except for the section where pipes pass (i.e., the remaining area serving as a passage). Each time personnel and equipment pass through, this entire shielding wall needs to be removed and rebuilt.

[0004] However, the inventors discovered that the existing technology has the following drawbacks: the work area for dismantling and assembling the shielding wall is exposed to radioactive radiation, and workers are exposed to this work area for extended periods. Even with special protection, the cumulative radiation dose is significant, which is very detrimental to personnel health. Moreover, repeated dismantling and assembling of this part also negatively impacts the radiation shielding function. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a reactor radiation shielding device.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide a reactor radiation shielding device, which includes a shielding base installed on a shielding structure and an openable shielding door;

[0007] The shielding base includes multiple interconnected shielding units;

[0008] One of the shielding units has a pipe clearance hole for the pipe to pass through;

[0009] One of the shielding units has a doorway for personnel and equipment to pass through; or multiple shielding units together form a doorway for personnel and equipment to pass through.

[0010] The shielding door is positioned on the shielding base corresponding to the door opening.

[0011] Preferably, the number of shielding units is five, namely a first shielding unit, a second shielding unit, a third shielding unit, a fourth shielding unit, and a fifth shielding unit;

[0012] The first shielding unit, the second shielding unit, the third shielding unit, and the fourth shielding unit are connected sequentially in the same straight direction;

[0013] Wherein, the second shielding unit forms the doorway; or the second shielding unit and the third shielding unit together form the doorway;

[0014] The pipe clearance hole is formed on the third shielding unit;

[0015] The fifth shielding unit extends along a straight line connecting the first shielding unit, the second shielding unit, the third shielding unit, and the fourth shielding unit, respectively, and connects to the bottom of the first shielding unit, the second shielding unit, the third shielding unit, and the fourth shielding unit.

[0016] Preferably, each of the shielding units includes a housing and a plurality of shielding material layers filled within the housing, with each shielding material layer being divided into multiple blocks.

[0017] Preferably, a layered gap is formed between adjacent shielding material layers; and a segmented gap is formed on each shielding material layer;

[0018] The layered gaps and segmented gaps between adjacent shielding units are staggered.

[0019] Preferably, the number of shielding material layers is three.

[0020] Preferably, the shielding door includes a door gap sealing unit, an inner door leaf, and an outer door leaf; the door gap sealing unit is adapted to the wall of the door opening;

[0021] When the door is closed, the inner and outer door panels are respectively fitted to the opposite sides of the door gap sealing unit, and together with the door gap sealing unit, they block the door opening to shield radiation;

[0022] When the door is open, the inner and outer door panels open in opposite directions, forming a passage for personnel and equipment to pass through at the door opening.

[0023] Preferably, the door gap sealing unit includes a horizontal frame and two vertical frames;

[0024] The two vertical frames are respectively disposed on the two opposite inner sidewalls of the door opening; the horizontal frame is disposed on the inner top wall of the door opening and connected between the two vertical frames.

[0025] Preferably, the horizontal and vertical frames are hollow structures filled with radiation shielding material.

[0026] Preferably, the reactor radiation shielding device further includes an outer door hinge; the outer door hinge includes a first outer door pivot, a connecting frame, and a second outer door pivot;

[0027] The first outer door hinge is hinged to the outer wall of the shielding structure; the second outer door hinge is hinged to the outer door leaf and is parallel to the first outer door hinge; the connecting frame is connected between the first outer door hinge and the second outer door hinge.

[0028] Preferably, the first outer door hinge and / or the second outer door hinge are provided with bearings.

[0029] Preferably, the reactor radiation shielding device further includes an inner door hinge, which includes a first hinge leaf, an inner door pivot, and a second hinge leaf;

[0030] The first hinge is connected to the inner wall of the shielding structure; the second hinge is connected to the inner door leaf, and the inner door pivot is connected between the first hinge and the second hinge.

[0031] Preferably, the inner door hinge is provided with a bearing.

[0032] Preferably, corner transition areas are formed on the opposite surfaces of the door gap sealing unit;

[0033] The inner door leaf surface facing the door gap filling unit and the outer door leaf surface facing the door gap filling unit are both formed with an arc surface or slope that matches the corner transition area.

[0034] Preferably, the inner door leaf includes a hollow inner door frame and a radiation shielding material filled within the inner door frame;

[0035] The outer door leaf includes a hollow outer door frame and radiation shielding material filled within the outer door frame.

[0036] Preferably, the inner door frame has multiple inner door filling cavities arranged along its length for filling with radiation shielding material; the boundary between adjacent inner door filling cavities is a bevel, a step, or a sawtooth shape.

[0037] The outer door frame has multiple outer door filling cavities arranged along its length for filling with radiation shielding material; the boundaries between adjacent outer door filling cavities are beveled, stepped, or sawtooth-shaped.

[0038] Preferably, the reactor radiation shielding device further includes an outer door locking assembly disposed between the shielding base and the outer door.

[0039] Preferably, the outer door locking assembly includes a handwheel, a connecting seat, and a hinge bolt;

[0040] The connecting seat is disposed on the outer door leaf; the hinge bolt passes through the connecting seat, and one end of the bolt is connected to the handwheel, while the other end is connected to the shielding base.

[0041] Preferably, the reactor radiation shielding device further includes an inner door locking assembly;

[0042] The inner door locking assembly is disposed on the inner door leaf, and in the closed state, the inner door locking assembly is located inside the door hole;

[0043] The inner door locking assembly locks the inner door leaf to the side wall of the door opening; and / or, the inner door locking assembly locks the inner door leaf to the bottom wall of the door opening.

[0044] Preferably, the inner door locking assembly includes a base plate assembly disposed on the inner door leaf and a locking rod disposed on the base plate assembly; the side wall and / or bottom wall of the door opening are provided with locking holes that match one end of the locking rod.

[0045] Preferably, the locking rod is a screw;

[0046] The inner door locking assembly further includes a locking assembly; the locking assembly includes a locking handle crank and a locking pivot; the locking pivot is disposed between the opposite end of the locking rod and the locking handle crank;

[0047] The locking lever can rotate back and forth between a first position and a second position around the locking pivot; in the first position, the locking lever and the locking rod are coaxial; in the second position, the locking lever and the locking rod are at an angle.

[0048] Preferably, the base plate assembly includes a base plate assembly body, a lock base, a lock shaft, and a rotating connector;

[0049] The base plate body is disposed on the inner door leaf; the lock base is disposed on the base plate body; the lock shaft passes through the lock base; the rotating connector is provided with a through hole and a threaded hole, the lock shaft passes through the through hole on the rotating connector and is rotatable relative to the through hole in the circumferential direction, and the locking rod passes through and is threadedly engaged with the threaded hole on the rotating connector.

[0050] Preferably, a ventilation gap is formed between the pipe clearance hole and the outer surface of the pipe through which it passes.

[0051] Implementing this invention has the following beneficial effects: Constructing a shielding base on a shielded structure can replace the existing shielding walls that require repeated disassembly and reassembly. The passage requirements for personnel and equipment can be met by opening and closing shielding doors, thus eliminating the need for repeated disassembly and reassembly of shielding walls and reducing the impact of radioactive radiation on personnel. Furthermore, the interlocking of multiple shielding units gives the shielding base a modular characteristic, facilitating transportation, on-site construction, and installation. It can effectively utilize limited on-site space, demonstrating good feasibility. Attached Figure Description

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0053] Figure 1 This is a schematic diagram of the reactor radiation shielding device according to an embodiment of the present invention from one perspective;

[0054] Figure 2 This is a front view of a reactor radiation shielding device according to an embodiment of the present invention;

[0055] Figure 3 yes Figure 2 Sectional view A1-A1;

[0056] Figure 4 This is a schematic diagram of the shielding material layer of a reactor radiation shielding device according to an embodiment of the present invention;

[0057] Figure 5 yes Figure 2 Sectional view A2-A2;

[0058] Figure 6 yes Figure 5 Enlarged diagram of part B;

[0059] Figure 7 yes Figure 5 A schematic diagram of the structure from a C-angle perspective;

[0060] Figure 8 This is a top view of a reactor radiation shielding device according to an embodiment of the present invention in the open state;

[0061] Figure 9 yes Figure 8 Enlarged schematic diagram of part F;

[0062] Figure 10 yes Figure 8 EE sectional view;

[0063] Figure 11 This is a schematic diagram of the inner door locking assembly of an embodiment of the reactor radiation shielding door of the present invention;

[0064] Figure 12This is a schematic diagram of the inner door locking assembly of another embodiment of the reactor radiation shielding door of the present invention. Detailed Implementation

[0065] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0066] The terms "first," "second," "third," etc., are used only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. "A plurality of" refers to two or more (including two), unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] like Figures 1 to 12 As shown, a reactor radiation shielding device according to an embodiment of the present invention includes a shielding base 1 built on a shielding structure 5 and an openable shielding door.

[0068] Specifically, the shielding base 1 is erected at the civil engineering opening in the shielding structure 5. The edge of the shielding base 1 is embedded into the civil engineering opening along its perimeter. In this way, less space is occupied around the shielding structure 5.

[0069] Furthermore, the installation of the shielding base 1 can fully adapt to the existing structure of the shielding structure 5 in the existing nuclear power plant, without the need to modify the existing structure of the shielding structure 5, thus minimizing the amount of modification work and reducing the cost.

[0070] Please see Figures 1 to 4 The shielding base 1 includes multiple interconnected shielding units.

[0071] One of the shielding units has a pipe clearance hole 10 for pipes to pass through.

[0072] One of the shielding units has a doorway for personnel and equipment to pass through; or multiple shielding units together form a doorway for personnel and equipment to pass through.

[0073] The shielding door is installed on the shielding base 1 corresponding to the door opening. When the shielding door is closed, it provides radiation shielding; when the shielding door is open, it allows personnel and equipment to pass through smoothly.

[0074] Thus, by building a shielding base 1 on the shielding structure 5, the shielding wall that needs to be repeatedly disassembled and reassembled in the existing technology can be replaced. The passage requirements of personnel and equipment can be met by opening and closing the shielding door, thereby saving the work of repeatedly disassembling and reassembling the shielding wall and reducing the impact of radioactive radiation on personnel.

[0075] In addition, the shielding base 1 includes multiple shielding units, which are spliced ​​together to give the shielding base 1 a modular feature, which facilitates transportation, on-site construction and installation, and can effectively utilize narrow on-site spaces, making it feasible.

[0076] The reactor radiation shielding device of the present invention can be applied to the renovation of existing projects as well as to the supporting construction of new units, and has excellent adaptability.

[0077] For shielding base 1:

[0078] Furthermore, in this embodiment, considering the actual environment within a nuclear power plant, the specific assembly method of each shielding unit is as follows:

[0079] There are five shielding units: the first shielding unit 71, the second shielding unit 72, the third shielding unit 73, the fourth shielding unit 74, and the fifth shielding unit 75.

[0080] The first shielding unit 71, the second shielding unit 72, the third shielding unit 73, and the fourth shielding unit 74 are connected sequentially in the same straight direction.

[0081] Specifically, the third shielding unit 73 is a quadrilateral solid structure with a circular pipe clearance hole 10 in the center. The third shielding unit 73 includes a radial limiting plate and an axial limiting plate, which provide radial and axial limiting support for the pipe, respectively. To achieve the installation and positioning of the third shielding unit 73, a connecting plate can be provided on the top of the third shielding unit 73, and the connecting plate can be welded to the embedded plate on the shielding structure 5.

[0082] The second shielding unit 72 and the fourth shielding unit 74 are located on opposite sides of the third shielding unit 73.

[0083] The second shielding unit 72 can form a doorway on its own; or the second shielding unit 72 and the third shielding unit 73 can form a doorway together.

[0084] Specifically, the second shielding unit 72 can be a rectangular frame that forms a rectangular doorway on its own. Alternatively, the second shielding unit 72 can be C-shaped, forming a rectangular doorway together with one side wall of the adjacent third shielding unit 73. This reduces the space occupied by the thickness of the second shielding unit 72 itself, increases the area of ​​the formed doorway, and increases the space for personnel and equipment to pass through.

[0085] The second shielding unit 72 can be a one-piece bent plate or a plate made of spliced ​​and welded plates.

[0086] The first shielding unit 71 and the fourth shielding unit 74 are cuboid structures.

[0087] The fifth shielding unit 75 extends along a straight line in which the first shielding unit 71, the second shielding unit 72, the third shielding unit 73, and the fourth shielding unit 74 are connected in sequence, and connects to the bottom of the first shielding unit 71, the second shielding unit 72, the third shielding unit 73, and the fourth shielding unit 74 respectively.

[0088] like Figure 1-2 As shown, to achieve the installation and positioning of the fifth shielding unit 75, a diagonal brace base 750 can be set between the fifth shielding unit 75 and the shielding structure 5. After the diagonal brace base 750 is installed, the fifth shielding unit 75 can be installed on the diagonal brace base 750 by means of bolt connection or other methods.

[0089] The splicing between the first shielding unit 71, the second shielding unit 72, the third shielding unit 73, the fourth shielding unit 74, and the fifth shielding unit 75 can be achieved by bolt connection or by other connection methods.

[0090] Understandably, in other embodiments, the number and arrangement of shielding units can be flexibly adjusted according to the actual on-site environment of different nuclear power plants.

[0091] Furthermore, such as Figure 4 As shown, in this embodiment, each shielding unit includes a housing (not shown) and multiple shielding material layers 8 filled inside the housing. Each shielding material layer 8 is divided into multiple pieces. In this way, the shielding material is divided into multiple small units inside the housing, which facilitates on-site assembly and transportation and has good feasibility.

[0092] Furthermore, such as Figure 4 As shown, layered gaps are formed between adjacent shielding material layers 8; each shielding material layer 8 has segmented gaps, that is, gaps are formed in a crisscross pattern on a shielding unit.

[0093] The layered and segmented gaps between adjacent shielding units are staggered. That is, the layered gaps and segmented gaps between adjacent shielding units are staggered to improve the radiation shielding effect. Because rays travel in straight lines, the staggered design effectively prevents rays from penetrating the gaps, resulting in better radiation shielding.

[0094] Taking into account factors such as construction difficulty, cost, and radiation shielding requirements, experiments show that three layers of shielding material 8 are sufficient to meet the radiation shielding requirements. Therefore, in this embodiment, the number of shielding material layers 8 is three.

[0095] Furthermore, in this embodiment, a ventilation gap is formed between the pipe clearance hole 10 and the outer surface of the pipe passing through it. The ventilation gap can be 100 mm, or other reasonable values.

[0096] The advantage of this ventilation gap is that it meets the ventilation requirements between factory buildings, avoids resonance caused by direct contact between the wall of the pipe clearance hole and the pipe, which would affect the stability of the structure, and also helps to meet the seismic design requirements.

[0097] For platform screen doors:

[0098] like Figures 1 to 10 As shown, in this embodiment, the shielding door includes a door gap filling unit 2, an inner door leaf 3, and an outer door leaf 4; the door gap filling unit 2 is adapted to the wall of the door hole.

[0099] The inner door 3 is closer to the core than the outer door 4; that is, the inner door 3 is closer to the source term than the outer door 4.

[0100] Meanwhile, in this embodiment, the thickness of the outer door leaf 4 is greater than the thickness of the inner door leaf 3.

[0101] like Figures 5 to 6 As shown, in the closed state, the inner door leaf 3 and the outer door leaf 4 are respectively adapted to the opposite sides of the door gap sealing unit 2, and together with the door gap sealing unit 2, they block the door hole to shield radiation.

[0102] like Figures 8 to 9 As shown, in the open state, the inner door leaf 3 and the outer door leaf 4 open in opposite directions, forming a passage for personnel and equipment to pass through at the door opening. Figure 6 As shown, the two opposite directions are D1 and D2. The inner door 3 opens along the D1 direction, and the outer door 4 opens along the D2 direction. This ensures that when personnel are carrying equipment, they can pass through the passage by slightly changing their walking direction.

[0103] Therefore, the outer door leaf 4 and the inner door leaf 3 together meet the requirements of radiation shielding and personnel and equipment passage. The weight and volume of a single door are reduced, which can meet the requirements of on-site installation and seismic design. In this way, it can effectively protect personnel and equipment (good shielding effect), solve the problem of convenient passage, and ensure on-site implementation and meet the requirements of seismic design.

[0104] Furthermore, in this embodiment, the door gap sealing unit 2 includes a horizontal frame 20 and two vertical frames 21;

[0105] Two vertical frames 21 are fixed to the two opposite inner walls of the door opening respectively; a horizontal frame 20 is fixed to the inner top wall of the door opening and connected between the two vertical frames 21.

[0106] The transverse frame 20 and the vertical frame 21 are hollow structures with a steel outer shell and radiation shielding material inside. This provides reliable structural strength from the outer shell, while the hollow interior reduces overall weight, facilitating on-site assembly and transportation, and meeting seismic design requirements.

[0107] Understandably, in other embodiments, the door gap sealing unit 2 may also be an integrally formed steel structure with radiation shielding function.

[0108] The horizontal frame 20 and the two vertical frames 21 can be integrally formed or they can be separate components assembled on-site.

[0109] Furthermore, in this embodiment, a double-hinge structure is used for opening the outer door leaf 4; and a single-hinge structure is used for opening the inner door leaf 3.

[0110] Corresponding to the opening of the outer door leaf 4, the shielding door also includes an outer door hinge; the outer door hinge includes a first outer door pivot 41, a connecting frame 40, and a second outer door pivot 42, forming a double door hinge structure.

[0111] The first outer door pivot 41 is hinged to the outer wall of the shielding structure 5; the second outer door pivot 42 is hinged to the outer door leaf 4 and is parallel to the first outer door pivot 41; the connecting frame 40 is connected between the first outer door pivot 41 and the second outer door pivot 42 to realize the rotation of the outer door leaf 4.

[0112] like Figure 1 As shown, a civil engineering connector 43 is provided between the outer wall of the shielding structure 5 and the first outer door hinge 41. The civil engineering connector 43 provides a rooting point for the installation of the first outer door hinge 41. The civil engineering connector 43 is welded to an embedded plate on the outer wall of the shielding structure 5, and the first outer door hinge 41 is bolted to the civil engineering connector 43. The civil engineering connector 43 can be formed by splicing and welding plates, or it can be integrally formed.

[0113] The dual-axis structure maximizes the opening space of the outer door leaf 4 along the D2 direction, making full use of the blank area on the outside of the outer door leaf 4 and increasing the space for personnel and equipment to pass through. Understandably, in other embodiments, depending on the actual space conditions on site, the outer door leaf 4 may also adopt a single-axis structure for opening.

[0114] Furthermore, in this embodiment, bearings (not shown) are provided on the first outer door pivot 41 and / or the second outer door pivot 42, which helps to reduce the opening force of the outer door leaf 4, improve its opening stability, and help meet the seismic strength requirements. The bearings can be thrust bearings.

[0115] Depending on the actual needs, a bearing may be installed only on the first outer door hinge 41; or only on the second outer door hinge 42; or both the first outer door hinge 41 and the second outer door hinge 42 may be installed simultaneously, so as to minimize the opening force of the outer door leaf 4, improve its opening stability, and meet the seismic strength requirements.

[0116] Corresponding to the opening of the inner door leaf 3, the shielding door also includes an inner door hinge, which includes a first hinge 31, an inner door pivot 30, and a second hinge 32.

[0117] The first hinge 31 is connected to the inner wall of the shielding structure 5; the second hinge 32 is connected to the inner door leaf 3, and the inner door pivot 30 is connected between the first hinge 31 and the second hinge 32 to realize the rotation of the inner door leaf 3.

[0118] As mentioned above, unlike the opening of the outer door leaf 4, the opening of the inner door leaf 3 is only considered to be a single-hinge structure. This configuration is based on the specific site environment in this embodiment. In other embodiments, depending on the actual space conditions, the inner door leaf 3 can also adopt a double-hinge structure. When the inner door leaf 3 adopts a double-hinge structure, the double-hinge structure on the outer door leaf 4 in this embodiment can be referenced.

[0119] Furthermore, a bearing (not shown) can also be installed on the inner door hinge 30 to reduce the opening force of the inner door leaf 4, improve its opening stability, and help meet the seismic strength requirements. The bearing can be a thrust bearing.

[0120] Furthermore, in this embodiment, as Figure 8 As shown, corner transition areas 23 are formed on the two opposite surfaces of the door gap sealing unit 2.

[0121] The surfaces of the inner door leaf 3 facing the door gap sealing unit 2 and the outer door leaf 4 facing the door gap sealing unit 2 are both formed with arc surfaces or slopes that are adapted to the corner transition area 23. In this way, when the door is closed, the outer door leaf 4 and the inner door leaf 3 can fit tightly against the door gap sealing unit 2.

[0122] Correspondingly, the shape of the corner transition area 23 can be a slope or an arc. When the corner transition area 23 is an arc, a matching arc is formed on the surface of the inner door leaf 3 facing the door gap filling unit 2 and on the surface of the outer door leaf 4 facing the door gap filling unit 2; when the corner transition area 23 is a slope, a matching slope is formed on the surface of the inner door leaf 3 facing the door gap filling unit 2 and on the surface of the outer door leaf 4 facing the door gap filling unit 2.

[0123] By using beveled or curved surfaces, the outer door leaf 4 and the inner door leaf 3 can be tightly fitted to the door gap sealing unit 2. More importantly, considering that rays are straight lines, the curved or beveled fit is designed to ensure that no rays penetrate the gap while maximizing the shielding effect.

[0124] Furthermore, in this embodiment, the inner door leaf 3 includes a hollow inner door frame and radiation shielding material filled within the inner door frame. Correspondingly, the outer door leaf 4 includes a hollow outer door frame and radiation shielding material filled within the outer door frame.

[0125] Radiation shielding materials can be made using thermosetting epoxy resin as a matrix, with the addition of boron and fire retardants. This results in high-temperature resistance and flame retardancy. Furthermore, the liquid-mix casting process allows for conformal manufacturing. When filled within a frame, the radiation shielding material ensures overall structural strength. It is also suitable for neutron or gamma-ray shielding and can withstand high-temperature or high-humidity environments.

[0126] Different radiation shielding materials can be flexibly selected depending on the source of the radiation.

[0127] Both the inner door leaf 3 and the outer door leaf 4 adopt a hollow frame structure, which facilitates on-site assembly and transportation, and is conducive to meeting the requirements of severe accidents and earthquake conditions.

[0128] Furthermore, in this embodiment, as Figures 8 to 10 As shown, especially Figure 10 As shown, the inner door frame has multiple inner door filling cavities 33 arranged along its length for filling with radiation shielding material. The radiation shielding material can be poured into the inner door filling cavity 33 (or outer door filling cavity) as a liquid mixture to form an inner door leaf or outer door leaf with radiation shielding function.

[0129] The boundary (or gap) between adjacent inner door filling cavities 33 is a shape such as a bevel, step, or sawtooth to prevent radiation penetration.

[0130] Similarly, the outer door frame has multiple outer door filling cavities (not shown, but refer to inner door filling cavity 33) arranged along its length for filling radiation shielding material; the boundary (or gap) between adjacent outer door filling cavities is a bevel, stepped, or sawtooth shape to prevent radiation penetration.

[0131] Specifically, since the rays are straight lines, when the boundary (or gap) between adjacent inner door filling cavities 33 is a bevel, a step, or a serrated shape, the rays cannot pass through in a straight line, thus minimizing ray leakage.

[0132] like Figure 10As shown, in the case of the bevel, each inner door filling cavity 33 (or outer door filling cavity) is approximately triangular prism-shaped, so the boundary between adjacent inner door filling cavities 33 (or outer door filling cavities) is bevel-shaped.

[0133] Furthermore, in this embodiment, for ease of understanding, please refer to the following key points. Figure 1 , Figure 2 , Figure 5 , Figure 8 The reactor radiation shielding device also includes an outer door locking assembly disposed between the shielding base 1 and the outer door 4. During the closing phase, the outer door locking assembly can further lock the shielding base 1 and the outer door 4, thereby enhancing the sealing effect between the outer door 4 and the shielding base 1, or between the outer door 4 and the door gap sealing unit 2.

[0134] Furthermore, in this embodiment, the outer door locking assembly includes a handwheel 6, a connecting seat 60, and a hinge bolt (not shown in the figure). The connecting seat 60 is disposed on the outer door leaf 4. The hinge bolt passes through the connecting seat 60, with one end connected to the handwheel 6 and the other end connected to the shielding base 1.

[0135] Specifically, after the outer door leaf 4 is closed, the length of the hinge bolt is adjusted by turning the handwheel 6 to press the connecting seat 60 onto the shielding base 1, thereby locking the outer door leaf 4 and the shielding base 1. It is understood that in other embodiments, other specific forms of outer door locking assemblies may also be used.

[0136] Please see Figure 6 , Figure 11 , Figure 12 Furthermore, in this embodiment, the reactor radiation shielding door also includes an inner door locking assembly.

[0137] The inner door locking assembly is installed on the inner door leaf 3, and in the closed state, the inner door locking assembly is located inside the door hole. That is, in the closed state, the inner door locking assembly is located on the door surface of the inner door leaf 3 facing the outer door leaf 4, and its function is to further lock the inner door leaf 3 into the door hole on the shielding base 1 after the inner door leaf 3 is closed.

[0138] The inner door locking assembly locks the inner door leaf 3 to the side wall of the door opening; and / or, the inner door locking assembly locks the inner door leaf 3 to the bottom wall of the door opening.

[0139] Specifically, inner door locking components can be installed at the upper and lower positions of the inner door leaf 3, thereby locking the inner door leaf 3 simultaneously to the side wall and bottom wall of the door opening. Alternatively, in other embodiments, the inner door leaf 3 may be locked only to the side wall or the bottom wall of the door opening. Preferably, locking the inner door leaf 3 simultaneously to the side wall and bottom wall of the door opening can maximize the sealing effect between the inner door leaf 3 and the door opening, or between the inner door leaf 3 and the door gap sealing unit.

[0140] For example, you can refer to Figures 11 to 12 , Figure 11 In the illustrated embodiment, the inner door locking assembly can lock the inner door leaf 3 to the bottom wall of the door hole; Figure 12 In the illustrated embodiment, the inner door locking assembly can lock the inner door leaf 3 to the side wall of the door opening. One or more sets of inner door locking assemblies, from the same embodiment or two different embodiments, can be provided depending on the actual site conditions.

[0141] Furthermore, in this embodiment, the inner door locking assembly includes a base plate assembly 90 disposed on the inner door leaf 3 and a locking rod 91 disposed on the base plate assembly 90. The side wall and / or bottom wall of the door opening are provided with locking holes (not shown) that match one end of the locking rod 91. When the door is closed, inserting one end of the locking rod 91 into the corresponding locking hole will lock the inner door leaf 3 to the side wall and / or bottom wall of the door opening.

[0142] Specifically, when the inner door locking assembly only locks the inner door leaf 3 to the side wall of the door opening, a corresponding locking hole can be provided on the side wall of the door opening. Alternatively, when the inner door locking assembly only locks the inner door leaf 3 to the bottom wall of the door opening, a corresponding locking hole can be provided on the bottom wall of the door opening. Furthermore, when the inner door locking assembly locks the inner door leaf 3 to both the side wall and the bottom wall of the door opening, corresponding locking holes can be provided on both the side wall and the bottom wall of the door opening respectively.

[0143] Furthermore, in this embodiment, the locking rod 91 is a screw, and the locking rod 91 is inserted into the corresponding locking hole for fastening by rotating the locking rod 91 to drive its extension and retraction.

[0144] Correspondingly, the inner door locking assembly also includes a locking component. The locking component includes a locking lever 92 and a locking pivot 93. The locking pivot 93 is disposed between the opposite end of the locking lever 91 and the locking lever 92.

[0145] Furthermore, the locking lever 92 can rotate back and forth between the first position and the second position around the locking pivot 93:

[0146] In the first position, the locking lever 92 and the locking rod 91 are coaxially arranged. Rotating the locking lever 92 in this position causes the locking rod 91 to rotate and extend / retract along its length, thereby inserting the locking rod 91 into the corresponding locking hole along its length. In the second position, the locking lever 92 and the locking rod 91 are arranged at an angle, and as shown... Figure 10-11 As shown, the locking lever 92 can be perpendicular to the locking lever 91, thereby axially positioning the locking lever 91 and preventing the locking lever 91 from shifting axially after being inserted into the locking hole, which could lead to a poor seal of the inner door leaf.

[0147] Furthermore, the base plate assembly 90 includes a base plate body 901, a lock base 902, a lock shaft 903, and a rotating connector 904;

[0148] The base plate body 901 is mounted on the inner door leaf 3. The lock base 902 is mounted on the base plate body 901. The lock shaft 903 passes through the lock base 902. The rotating connector 904 is provided with a through hole (not shown) and a threaded hole (not shown). The lock shaft 903 passes through the through hole on the rotating connector 904 and can rotate circumferentially relative to the inner wall of the through hole. The locking rod 91 passes through and is threaded into the threaded hole on the rotating connector 904.

[0149] Specifically, the rotating connector 904 can rotate circumferentially around the locking shaft 903, thereby driving the locking rod 91 to rotate around the locking shaft 903, so that the locking rod 91 has a certain position adjustment space to match the angle of the corresponding locking hole on site, reserving a certain position error adjustment space for on-site construction, ensuring that the locking rod 91 can be accurately inserted into the corresponding locking hole on site, so that the two are tightly fitted together.

[0150] Depending on the site conditions, the shielding base 1 can also adopt a hollow frame structure filled with radiation shielding material to minimize radiation leakage.

[0151] To meet on-site transportation and installation needs and facilitate on-site implementation, the components (shielding base 1, door gap sealing unit 2, inner door leaf 3, outer door leaf 4) can be modularized to limit the length and weight of individual components or smaller units.

[0152] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A reactor radiation shielding device, characterized in that, Includes a shielding base (1) installed on the shielding structure (5) and an openable shielding door; The shielding base (1) includes multiple interconnected shielding units; One of the shielding units has a pipe clearance hole (10) for the pipe to pass through. One of the shielding units has a doorway for personnel and equipment to pass through; or multiple shielding units together form a doorway for personnel and equipment to pass through. The shielding door is disposed on the shielding base (1) corresponding to the door hole; The shielding door includes a door gap sealing unit (2), an inner door leaf (3), and an outer door leaf (4); the door gap sealing unit (2) is adapted to the wall of the door opening; in the closed state, the inner door leaf (3) and the outer door leaf (4) are respectively adapted to the opposite sides of the door gap sealing unit (2), and together with the door gap sealing unit (2), they block the door opening to shield radiation; in the open state, the inner door leaf (3) and the outer door leaf (4) open in opposite directions, forming a passage for personnel and equipment to pass through the door opening; The door gap filling unit (2) has corner transition areas (23) formed on its two opposite surfaces; the inner door leaf (3) facing the door gap filling unit (2) and the outer door leaf (4) facing the door gap filling unit (2) are both formed with arc surfaces or slopes that are adapted to the corner transition areas (23).

2. The reactor radiation shielding device according to claim 1, characterized in that, The number of shielding units is five, namely the first shielding unit (71), the second shielding unit (72), the third shielding unit (73), the fourth shielding unit (74), and the fifth shielding unit (75). The first shielding unit (71), the second shielding unit (72), the third shielding unit (73), and the fourth shielding unit (74) are connected sequentially in the same straight direction; Wherein, the second shielding unit (72) forms the door opening; or the second shielding unit (72) and the third shielding unit (73) together form the door opening; The pipe clearance hole (10) is formed on the third shielding unit (73). The fifth shielding unit (75) extends along a straight line in which the first shielding unit (71), the second shielding unit (72), the third shielding unit (73), and the fourth shielding unit (74) are connected in sequence, and is connected to the bottom of the first shielding unit (71), the second shielding unit (72), the third shielding unit (73), and the fourth shielding unit (74) respectively.

3. The reactor radiation shielding device according to claim 1, characterized in that, Each of the shielding units includes a housing and a plurality of shielding material layers (8) filled within the housing, each shielding material layer (8) being divided into multiple blocks.

4. The reactor radiation shielding device according to claim 3, characterized in that, A layered gap is formed between adjacent shielding material layers (8); a segmented gap is formed on each shielding material layer (8); The layered gaps and segmented gaps between adjacent shielding units are staggered.

5. The reactor radiation shielding device according to claim 3, characterized in that, The number of shielding material layers (8) is three.

6. The reactor radiation shielding device according to claim 1, characterized in that, The door gap sealing unit (2) includes a horizontal frame (20) and two vertical frames (21). The two vertical frames (21) are respectively disposed on the two opposite inner sidewalls of the door opening; the horizontal frame (20) is disposed on the inner top wall of the door opening and connected between the two vertical frames (21).

7. The reactor radiation shielding device according to claim 6, characterized in that, The horizontal frame (20) and the vertical frame (21) are hollow structures filled with radiation shielding material.

8. The reactor radiation shielding device according to claim 6, characterized in that, The reactor radiation shielding device also includes an outer door hinge; the outer door hinge includes a first outer door pivot (41), a connecting frame (40), and a second outer door pivot (42). The first outer door pivot (41) is hinged to the outer wall of the shielding structure (5); the second outer door pivot (42) is hinged to the outer door leaf (4) and parallel to the first outer door pivot (41); the connecting frame (40) is connected between the first outer door pivot (41) and the second outer door pivot (42).

9. The reactor radiation shielding device according to claim 8, characterized in that, Bearings are provided on the first outer door pivot (41) and / or the second outer door pivot (42).

10. The reactor radiation shielding device according to claim 1, characterized in that, The reactor radiation shielding device also includes an inner door hinge, which includes a first hinge (31), an inner door pivot (30), and a second hinge (32). The first hinge (31) is connected to the inner wall of the shielding structure (5); the second hinge (32) is connected to the inner door leaf (3), and the inner door pivot (30) is connected between the first hinge (31) and the second hinge (32).

11. The reactor radiation shielding device according to claim 10, characterized in that, The inner door pivot (30) is equipped with a bearing.

12. The reactor radiation shielding device according to claim 1, characterized in that, The inner door leaf (3) includes a hollow inner door frame and a radiation shielding material filled in the inner door frame; The outer door leaf (4) includes a hollow outer door frame and a radiation shielding material filled in the outer door frame.

13. The reactor radiation shielding device according to claim 12, characterized in that, The inner door frame has multiple inner door filling cavities (33) arranged along its length for filling with radiation shielding material; the boundary between adjacent inner door filling cavities (33) is a bevel, a step, or a sawtooth shape; The outer door frame has multiple outer door filling cavities arranged along its length for filling with radiation shielding material; the boundaries between adjacent outer door filling cavities are beveled, stepped, or sawtooth-shaped.

14. The reactor radiation shielding device according to claim 1, characterized in that, The reactor radiation shielding device also includes an outer door locking assembly disposed between the shielding base (1) and the outer door (4).

15. The reactor radiation shielding device according to claim 14, characterized in that, The outer door locking assembly includes a handwheel (6), a connecting seat (60), and a hinge bolt; The connecting seat (60) is disposed on the outer door leaf (4); the hinge bolt passes through the connecting seat (60), and one end of it is connected to the handwheel (6), and the other end is connected to the shielding base (1).

16. The reactor radiation shielding device according to claim 1, characterized in that, The reactor radiation shielding device also includes an inner door locking assembly; The inner door locking assembly is disposed on the inner door leaf (3), and in the closed state, the inner door locking assembly is located inside the door hole; The inner door locking assembly locks the inner door leaf (3) to the side wall of the door opening; and / or, the inner door locking assembly locks the inner door leaf (3) to the bottom wall of the door opening.

17. The reactor radiation shielding device according to claim 16, characterized in that, The inner door locking assembly includes a base plate assembly disposed on the inner door leaf (3) and a locking rod disposed on the base plate assembly; the side wall and / or bottom wall of the door hole are provided with locking holes that match one end of the locking rod.

18. The reactor radiation shielding device according to claim 17, characterized in that, The locking rod is a screw; The inner door locking assembly further includes a locking assembly; the locking assembly includes a locking handle crank and a locking pivot; the locking pivot is disposed between the opposite end of the locking rod and the locking handle crank; The locking lever can rotate back and forth between a first position and a second position around the locking pivot; in the first position, the locking lever and the locking rod are coaxial; in the second position, the locking lever and the locking rod are at an angle.

19. The reactor radiation shielding device according to claim 17, characterized in that, The base plate assembly includes a base plate body, a lock base, a lock shaft, and a rotating connector; The base plate body is set on the inner door leaf (3); the lock base is set on the base plate body; the lock shaft passes through the lock base; the rotating connector is provided with a through hole and a threaded hole, the lock shaft passes through the through hole on the rotating connector and is rotatable relative to the through hole in the circumferential direction, and the locking rod passes through and is threaded into the threaded hole on the rotating connector.

20. The reactor radiation shielding device according to any one of claims 1-19, characterized in that, A ventilation gap is formed between the pipe clearance hole (10) and the outer surface of the pipe through which it passes.

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