Foreign matter prevention device and foreign matter prevention method for nuclear fuel operation pool of nuclear power plant

Abstract

The invention discloses a foreign matter prevention device and method for a nuclear fuel operation pool of a nuclear power plant, the foreign matter prevention device comprises a plurality of supporting stand columns, at least two guide rails, a plurality of sliding assemblies and a telescopic awning support, each guide rail is connected with the plurality of supporting stand columns, and the two guide rails are oppositely arranged along a first direction and respectively extend along a second direction; the first direction is perpendicular to the second direction; the bottom of the telescopic awning support is connected with a plurality of sliding assemblies which are slidably connected with the guide rails in a matched mode. The telescopic awning support comprises an unfolded state and a contracted state. In the unfolded state, the telescopic awning support is distributed on the first preset length of the guide rail. In the contraction state, the telescopic awning supports are distributed on the second preset length of the guide rail. The first preset length is larger than the second preset length and smaller than the guide rail length. The foreign matter preventing device is simple in structure, rapid to install and capable of preventing foreign matter on the upper portion of the telescopic awning support from falling into the telescopic awning support, and potential safety hazards are fundamentally eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant maintenance, and particularly to an anti-foreign object device and method for a nuclear fuel operation pool in a nuclear power plant. Background Art

[0002] With the operation of nuclear power plants, various maintenance activities are frequent. Loosening of some components / members in the reactor building and equipment, human operation errors, etc. will all cause foreign objects to fall, and the probability of occurrence is increasing. If these falling objects fall into the pool related to nuclear fuel operation, it will have a serious impact on the safety of the unit.

[0003] The nuclear fuel operation pool in a nuclear power plant includes a main reactor pool (referred to as the "reactor pool", including the reactor cavity pool and the in-core structure pool) and a spent fuel storage pool (referred to as the "spent pool"). During power plant overhauls or daily maintenance activities, during operations by the pool side and above the pool, due to human factors or equipment defects, foreign objects such as equipment parts, tools, and personal wearables often fall into the pool. If foreign objects fall into fuel assemblies, in-core structures, and the pool, etc., if they cannot be discovered and salvaged in time, it will seriously affect the integrity of the fuel assemblies and the safety of primary loop system equipment; if they are carried into the reactor core, it will affect the safety control of the reactor core and seriously affect nuclear safety. And if foreign objects fall into the spent pool, it is difficult to salvage them, and it will generate a relatively high irradiation risk. Therefore, effectively controlling foreign objects from falling into the pool is an urgent issue to be solved in nuclear power plants.

[0004] Currently, incidents of foreign objects falling into the nuclear fuel pool occur from time to time, which not only affects the normal operation of the unit, but also the subsequent salvage work will consume a certain amount of manpower, material resources, and time. During nuclear power plant overhauls, to prevent foreign objects from falling into the nuclear fuel operation pool, the conventional operation is to use a simple anti-foreign object measure, covering the upper part of the pool by dragging a whole piece of cover cloth in a lapped manner. This structure is relatively simple, and it requires multiple people to operate with the help of auxiliary tools. Due to the limitation of the on-site maintenance space and items by the pool side, the operation is cumbersome and there are certain safety hazards. Moreover, disassembly, installation, and adjustment are difficult, the overall strength and reliability are low, and the protective cover occupies the operation space above the nuclear fuel operation pool, which has a certain impact on the maintenance operations above the nuclear fuel operation pool. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an anti-foreign object device and method for a nuclear fuel operation pool in a nuclear power plant.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A foreign object prevention device for a nuclear fuel operation pool in a nuclear power plant, comprising a plurality of support columns, at least two guide rails, a plurality of sliding components and a telescopic awning bracket. Each of the guide rails is connected to the plurality of support columns. The two guide rails are arranged opposite to each other in a first direction and extend respectively in a second direction. The first direction is perpendicular to the second direction. The bottom of the telescopic awning bracket is connected to the plurality of sliding components, and the sliding components are slidably connected in cooperation with the guide rails.

[0007] The telescopic awning bracket includes a deployed state and a retracted state: In the deployed state, the telescopic awning bracket is distributed on a first preset length of the guide rail; In the retracted state, the telescopic awning bracket is distributed on a second preset length of the guide rail; The first preset length is greater than the second preset length and less than the length of the guide rail.

[0008] In some embodiments, the telescopic awning bracket includes a plurality of support skeletons, a flexible awning and a plurality of connecting pieces. The flexible awning covers the plurality of support skeletons, and each support skeleton is connected to the flexible awning through the plurality of connecting pieces; Opposite ends of each support skeleton are respectively connected to at least one of the sliding components;

[0009] In the deployed state, the length of the flexible awning is greater than or equal to the first preset length.

[0010] In some embodiments, the support skeleton includes at least two vertical rods and at least one cross beam. The cross beam is respectively connected to the two vertical rods and is connected to the flexible awning through the connecting piece; The bottom of each vertical rod is connected to at least one of the sliding components.

[0011] In some embodiments, the support skeleton further includes at least two diagonal braces and a plurality of reinforcing rods. The two diagonal braces and the cross beam together form a triangular support structure, and each reinforcing rod is respectively connected to the diagonal brace and the cross beam.

[0012] In some embodiments, the support skeleton further includes at least two mounting seats, and each mounting seat is respectively connected to the bottom of the vertical rod and the sliding component.

[0013] In some embodiments, the sliding component includes at least one pulley, and the pulley is rotatably connected to the mounting seat through a connecting shaft.

[0014] In some embodiments, the support column is provided with a plurality of mounting parts arranged at intervals along its axial direction, and at least one of the mounting parts is detachably connected to the guide rail through a fastener.

[0015] In some embodiments, it further includes a storage rack for storing the sliding assembly and the retractable awning bracket, and the storage rack is provided with at least one side opening.

[0016] In some embodiments, the storage rack includes at least two storage rails and a fixing component for accommodating a plurality of the sliding assemblies, the fixing component is respectively connected to the two storage rails, and each storage rail is detachably spliced with the guide rail;

[0017] The length of the storage rail is greater than or equal to the second preset length, and the distance between the two storage rails is the same as the distance between two relatively arranged sliding assemblies.

[0018] In some embodiments, the fixing component includes at least two fixing columns and at least one fixing beam, each fixing beam is respectively connected to the two fixing columns, and each fixing column is connected to the storage rail; the fixing column extends upward and its height is greater than the total height of the sliding assembly and the retractable awning bracket.

[0019] In some embodiments, the storage rack further includes a plurality of lifting lugs, and the plurality of lifting lugs are symmetrically connected to the fixing component.

[0020] In some embodiments, the storage rack further includes at least two connecting bottom plates, the connecting bottom plates are connected to the bottom of the storage rail and are connected to the fixing component on the outer side of the storage rail.

[0021] In some embodiments, the fixing component includes a plurality of fixing plates, and each fixing plate is respectively connected to the two storage rails.

[0022] In some embodiments, the storage rack further includes a lifting structure, and the lifting structure is arranged at the bottom of the storage rail and / or the fixing component.

[0023] In some embodiments, the storage rack further includes a moving component, and the moving component is installed at the bottom of the storage rack.

[0024] In some embodiments, the connecting member is a flexible connecting member.

[0025] In some embodiments, the flexible awning is a semi-transparent tarpaulin.

[0026] In some embodiments, the retractable awning bracket further includes a lighting device, and the lighting device is arranged at the lower part of the flexible awning and is fixedly connected to the support framework.

[0027] The present invention also constructs a method for preventing foreign objects in a nuclear fuel operation pool of a nuclear power plant. Using the nuclear fuel operation pool foreign object prevention device described in any one of the above, it includes the following steps:

[0028] S100: Detachably connect several of the support columns to the guardrails in the length direction of the nuclear fuel operation pool respectively, and arrange the several support columns at intervals;

[0029] S200: Symmetrically arrange the two guide rails on the opposite sides in the width direction of the nuclear fuel operation pool, and connect them to several of the support columns respectively;

[0030] S300: First, fixedly connect the sliding assembly and the telescopic awning bracket, and then install the sliding assembly in cooperation with the guide rail;

[0031] S400: The sliding assembly slides along the length direction of the guide rail, driving the telescopic awning bracket to unfold along the guide rail and distribute on the first preset length of the guide rail.

[0032] By implementing the present invention, the following beneficial effects are achieved:

[0033] The anti-foreign object device for the nuclear fuel operation pool of a nuclear power plant according to the present invention includes several support columns, at least two guide rails, several sliding assemblies and a telescopic awning bracket. Each of the guide rails is connected to several of the support columns. The two guide rails are arranged opposite to each other in the first direction and extend along the second direction respectively, and the first direction is perpendicular to the second direction; the bottom of the telescopic awning bracket is connected to several of the sliding assemblies, and the sliding assemblies are slidably connected in cooperation with the guide rails; the telescopic awning bracket includes a deployed state and a retracted state: in the deployed state, the telescopic awning bracket is distributed on the first preset length of the guide rail; in the retracted state, the telescopic awning bracket is distributed on the second preset length of the guide rail; the first preset length is greater than the second preset length and less than the length of the guide rail. An installation foundation for the telescopic awning bracket is formed by the support columns and the guide rails, and the sliding assembly drives the telescopic awning bracket to unfold or contract, with a simple structure and quick installation. In the deployed state, it can prevent foreign objects from passing through the telescopic awning bracket and falling into the lower position of the telescopic awning bracket, and prevent the problem of foreign objects falling from above the telescopic awning bracket, fundamentally eliminating potential safety hazards.

[0034] Method for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant. Using the device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant described in any one of the above, the method includes the following steps: S100: detachably connect a plurality of the support columns to the guardrails in the length direction of the nuclear fuel operation pool, and the plurality of support columns are arranged at intervals; S200: symmetrically arrange two of the guide rails on the opposite sides in the width direction of the nuclear fuel operation pool, and respectively connect them to the plurality of support columns; S300: pre-connect and fix the sliding assembly and the telescopic awning bracket, and then install the sliding assembly in cooperation with the guide rail; S400: the sliding assembly slides along the length direction of the guide rail, driving the telescopic awning bracket to unfold along the guide rail and distribute on the first preset length of the guide rail. By detachably connecting the support columns to the guardrails, convenient installation is achieved and the overall fixation of the device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant is realized. Through the support columns and the guide rails, an installation foundation for the telescopic awning bracket is formed. The sliding assembly drives the telescopic awning bracket to unfold and can cover the upper part of the nuclear fuel operation pool, isolating the nuclear fuel operation pool from the upper external environment, preventing foreign objects from falling through the nuclear fuel operation pool, so as to solve the problem of foreign objects falling into the upper part of the nuclear fuel operation pool area, fundamentally eliminating potential safety hazards, and ensuring the safe operation of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0036] Figure 1 is a schematic structural diagram of the device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant in the deployed state according to Embodiment 1 of the present invention;

[0037] Figure 2 is Figure 1 a schematic structural diagram of the device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant in the retracted state in;

[0038] Figure 3 is Figure 2 an enlarged structural diagram of the telescopic awning bracket in;

[0039] Figure 4 is Figure 1 an enlarged schematic diagram of Structure A, i.e., the sliding assembly, in;

[0040] Figure 5 is a schematic structural diagram of the cooperation of the storage rack, the sliding assembly and the telescopic awning bracket according to an embodiment of the present invention;

[0041] Figure 6 is Figure 5 an enlarged schematic diagram of Structure B in;

[0042] Figure 7It is an installation schematic diagram of the method for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant according to the second embodiment of the present invention. Detailed implementation manners

[0043] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a chemical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0046] Embodiment 1:

[0047] Refer to Figures 1 to 6 , an embodiment of the present invention discloses a device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant, which is applicable to the nuclear fuel operation pool 6 of a nuclear power plant and other similar environments in a nuclear power plant where it is necessary to prevent foreign objects from falling from above. The nuclear fuel operation pool 6 of a nuclear power plant includes a main reactor pool, such as a reactor cavity pool and an in-core component pool, and also includes a spent fuel storage pool. The device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant is mainly used to solve the problem of foreign objects falling into from above. Hereinafter, taking the application to the nuclear fuel operation pool 6 of a nuclear power plant as an example, the structure of the device for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant will be described in detail.

[0048] As Figure 1 and Figure 2As shown in the figure, the foreign object prevention device for the nuclear fuel operation pool of the nuclear power plant includes several support columns 1, at least two guide rails 2, several sliding components 3, and a telescopic awning support 4. Each guide rail 2 is connected to several support columns 1. The two guide rails 2 are arranged opposite to each other in the first direction and extend respectively in the second direction. The first direction is perpendicular to the second direction. The bottom of the telescopic awning support is connected to several sliding components 3, and the sliding components 3 are slidably connected to the guide rails 2 in cooperation. The support columns 1 are used to provide an installation foundation. The guide rails 2 are used to provide an installation track and temporarily store the sliding components 3 and the telescopic awning support 4. The sliding components 3 are mainly used to slide in cooperation with the guide rails 2, thereby driving the movement of the telescopic awning support. The telescopic awning support is the protection main body, which is used to prevent foreign objects from falling into the upper part thereof. It can be understood that in this embodiment, the first direction is the width direction of the nuclear fuel operation pool 6, and the second direction is the length direction of the nuclear fuel operation pool 6. The guide rails 2 and the telescopic awning support 4 respectively adopt an integrated form to realize overall handling, installation, and storage.

[0049] The telescopic awning support 4 includes an unfolded state (working state) and a contracted state (storage state): As Figure 1 shown, in the unfolded state, the telescopic awning support 4 is distributed on the first preset length of the guide rail 2. As Figure 2 shown, in the contracted state, the telescopic awning support 4 is distributed on the second preset length of the guide rail 2. The first preset length is greater than the second preset length and less than the length of the guide rail 2. Among them, the contracted state is the basic state of the telescopic awning support 4. When in need of use, the telescopic awning support 4 is then unfolded into the unfolded state. It can be understood that the unfolded state can be a fully unfolded state or a semi-unfolded state. The fully unfolded state means that the telescopic awning support 4 is unfolded to the fully extended degree. The semi-unfolded state is between the fully unfolded state and the contracted state. The telescopic awning support 4 is partially unfolded but partially not unfolded, or is fully unfolded but not fully extended, or is partially unfolded to the fully extended degree and partially in the contracted state. Similarly, the first preset length of the guide rail 2 can be the full length of the guide rail 2 or a partial length of the guide rail 2. The second preset length is the length of the guide rail 2 required to be occupied by the telescopic awning support 4 in its basic state. Exactly speaking, the second preset length is the length of the guide rail 2 required to be occupied by the sliding components 3 in the basic state of the telescopic awning support 4. The second preset length can be any section on the full length of the guide rail 2, such as the right end of the length of the guide rail 2, the left end of the length of the guide rail 2, etc.

[0050] As Figure 3As shown, in some embodiments, the retractable awning bracket 4 includes a plurality of support skeletons 41, a flexible awning 42, and a plurality of connectors. The flexible awning 42 covers the plurality of support skeletons 41, and each support skeleton 41 is connected to the flexible awning 42 through a plurality of connectors. Opposite ends of each support skeleton 41 are respectively connected to at least one sliding assembly 3. In the deployed state, the length of the flexible awning 42 is greater than or equal to a first preset length. Among them, the support skeletons 41, the flexible awning 42, and the connectors are mostly used inside nuclear power plants and can use radiation-proof materials. The support skeleton 41 is used to support the flexible awning 42 and needs to have a certain bearing capacity and strength. Hard materials are used, such as steel. To reduce the mass and facilitate deployment and contraction, lightweight materials or hollow pipe fittings can be used. The flexible awning 42 is the main protective structure and needs to withstand the impact force of falling foreign objects from high altitudes. It has a certain strength, toughness, and hardness and can be folded, such as a tarpaulin. Preferably, the flexible awning 42 is a semi-transparent tarpaulin, which can transmit light and can also be provided with internal lighting to increase the brightness. The connectors are used to fix the flexible awning 42 on the support skeleton 41 and can be flexible connectors, such as binding ropes, gear binding straps, etc. While fixing the flexible awning 42, damage to the flexible awning 42 is avoided.

[0051] It can be understood that the number of support skeletons 41 can be set according to actual needs, greater than or equal to 2, as long as the flexible awning 42 can be stably supported, such as 2, 4, 5, 6, 8, 9, etc. Similarly, the number of connectors is based on the selection criterion that the flexible awning 42 can be stably fixed, and the present invention does not limit the number of connectors.

[0052] In some embodiments, the support skeleton 41 includes at least two vertical rods 411 and at least one cross beam 412. The cross beam 412 is respectively connected to the two vertical rods 411 and is connected to the flexible awning 42 through a connector. The bottom of each vertical rod 411 is connected to at least one sliding assembly 3. Among them, the flexible awning 42 covers above the cross beam 412, and the width of the flexible awning 42 can be equivalent to the length of the cross beam 412.

[0053] In some embodiments, the support skeleton 41 further includes at least two diagonal braces 413 and a plurality of reinforcing rods 414. The two diagonal braces 413 and the cross beam 412 together form a triangular support structure, and each reinforcing rod 414 is respectively connected to the diagonal brace 413 and the cross beam 412. The stability of the cross beam 412 can be increased. The flexible awning 42 covers the triangular support structure, for example, covers above the two diagonal braces 413, forming a shape with a high middle and low sides. When foreign objects fall on the flexible awning 42, they can roll to the lower sides on both sides, which is convenient for cleaning.

[0054] Such as Figure 4As shown, in some embodiments, the support framework 41 further includes at least two mounting seats 415, and each mounting seat 415 is respectively connected to the bottom of the vertical rod 411 and the sliding assembly 3. The mounting seat 415 is used to connect the vertical rod 411 and the sliding assembly 3, providing a mounting foundation for the sliding assembly 3. For ease of movement, lightweight materials are selected.

[0055] As Figure 4 shown, in some embodiments, the sliding assembly 3 includes at least one pulley 31, and the pulley 31 is rotatably connected to the mounting seat 415 through a connecting shaft. The number of pulleys 31 can be one, two, three, four, etc., as long as it can slide smoothly. Preferably, in this embodiment, the sliding assembly 3 includes four pulleys 31 to ensure its independent support and realize independent movement.

[0056] It can be understood that the sliding assembly 3 is adaptively arranged with the guide rail 2. When the sliding assembly 3 includes at least one pulley 31, the guide rail 2 can be provided with a chute for the pulley 31 to slide. For example, if the chute faces the relative outer sides of the two guide rails 2, then the pulley 31 is arranged on the inner side of the mounting seat 415; or if the chute faces the relative inner sides of the two guide rails 2, then the pulley 31 is arranged on the outer side of the mounting seat 415.

[0057] In some embodiments, the support column 1 is provided with a plurality of mounting parts arranged at intervals along its axial direction, and at least one mounting part is detachably connected to the guide rail 2 through a fastener. The two guide rails 2 can realize the adjustment of the mounting height by connecting to different positions of the mounting parts. The mounting part can be a through hole, and the fastener is a bolt and nut. The mounting part is not shown in the figure.

[0058] In some embodiments, the retractable awning bracket 4 further includes a lighting device, and the lighting device is arranged under the flexible awning 42 and fixedly connected to the support framework 41. The lighting device is used to provide lighting, compensate for the brightness, and facilitate personnel operation. The lighting device needs to be externally powered. The lighting device is not shown in the figure.

[0059] As Figure 5 shown, in some embodiments, it further includes a storage rack 5 for storing the sliding assembly 3 and the retractable awning bracket 4, and the storage rack 5 has at least one side opening. The storage rack 5 is used to store the sliding assembly 3 and the retractable awning bracket 4. It can be that the sliding assembly 3 abuts and is fixed to the storage rack 5, and the retractable awning bracket 4 is not connected to the storage rack 5. The sliding assembly 3 and the retractable awning bracket 4 can be moved into or out of the storage rack 5 from the opening. Before use, the sliding assembly 3 and the retractable awning bracket 4 can be stored in the storage rack 5. When in need of use, move the storage rack 5 near the guide rail 2, and move the sliding assembly 3 and the retractable awning bracket 4 in the storage rack 5 out of the opening onto the guide rail 2. The storage rack 5 can be quickly docked with the guide rail 2, greatly improving the installation and disassembly efficiency of the foreign object prevention device for the nuclear fuel operation pool in this nuclear power plant.

[0060] In some embodiments, the storage rack 5 includes at least two storage rails 51 for accommodating a plurality of sliding components 3 and a fixing component 52. The fixing component 52 is respectively connected to the two storage rails 51, and each storage rail 51 is detachably spliced with the guide rail 2. The length of the storage rail 51 is greater than or equal to a second preset length, and the distance between the two storage rails 51 is the same as the distance between two relatively arranged sliding components 3. The storage rail 51 is used to place the sliding component 3. The length of the storage rail 51 is the length required for the sliding component 3 in the basic state of the retractable awning bracket 4, which is the same as the second preset length. In order to prevent the sliding component 3 from sliding out of the storage rail 51, a limiting member, such as an end plug, a bolt, etc., can be provided at any end of the storage rail 51, and the limiting member is detachably or non-detachably connected to the storage rail 51. The fixing component 52 is used to fix the two storage rails 51.

[0061] In some embodiments, the fixing component 52 includes at least two fixing columns 521 and at least one fixing beam 522. Each fixing beam 522 is respectively connected to the two fixing columns 521, and each fixing column 521 is connected to the storage rail 51. The fixing column 521 extends upward and its height is greater than the total height of the sliding component 3 and the retractable awning bracket 4. To maintain balance, the fixing component 52 is arranged on the axis of symmetry of the storage rail 51. The number of the fixing beams 522 can be one, two, three, etc., and the ratio of the number of the fixing columns 521 to the number of the fixing beams 522 is 2:1.

[0062] To facilitate the docking of the storage rail 51 and the guide rail 2, the storage rack 5 further includes a plurality of lifting lugs 53, and the plurality of lifting lugs 53 are symmetrically connected to the fixing component 52. It can facilitate hoisting for operations such as transportation and docking. For example, the storage rack 5 includes one lifting lug 53, and the lifting lug 53 is arranged at the geometric midpoint of the fixing component 52. Specifically, the lifting lug 53 is arranged at the geometric midpoint of the fixing beam 522. When there are multiple fixing beams 522, the lifting lugs 53 can be symmetrically arranged on the multiple fixing beams 522. Alternatively, the plurality of lifting lugs 53 can be symmetrically arranged on the fixing columns 521.

[0063] As Figure 6 shown, to facilitate the connection between the fixing column 521 and the storage rail 51, the fixing component 52 further includes at least two connecting base plates 54. The connecting base plates 54 are connected to the bottom of the storage rail 51 and are connected to the fixing component 52 on the outside of the storage rail 51. It can avoid the sliding component 3, and using the connecting base plates 54 facilitates the connection between the storage rail 51 and the fixing component 52 and improves stability.

[0064] Understandably, in some other embodiments, the fixing component 52 further includes other structural forms. The fixing component 52 includes several fixing plates, and each fixing plate is respectively connected to two receiving rails 51. The fixing plates fix the two receiving rails 51. For example, when the fixing plates are arranged at the bottom of the receiving rails 51 and forklifts are used for lifting and installation during transportation and docking with the guide rail 2. The fixing plates are not shown in the figure.

[0065] In some embodiments, to facilitate the docking of the receiving rail 51 and the guide rail 2, the receiving rack 5 further includes a lifting structure, and the lifting structure is arranged at the bottom of the receiving rail 51 and / or the fixing component 52. The lifting structure includes various connection methods and can be connected to the bottom of the receiving rail 51, or to the fixing component 52, such as the bottom of the fixing plate, or can be connected to the bottom of both the receiving rail 51 and the fixing plate at the same time. Among them, the lifting structure can be an electric lifting platform, a hydraulic lifting device, etc., which is specifically set according to needs. The lifting structure is not shown in the figure.

[0066] In some embodiments, the receiving rack 5 further includes a moving component 55, and the moving component 55 is symmetrically installed at the bottom of the receiving rack 5. For example, it is symmetrically installed at the bottom of the two receiving rails 51 and can move a short distance to adjust the relative position with the guide rail 2 to facilitate subsequent docking. Among them, the moving component 55 can be multiple wheels, such as four, six, etc., and specifically can be universal wheels. The moving component 55 can also be provided with several braking devices. The moving component 55 is a prior art and will not be elaborated here.

[0067] The anti-foreign object device for the nuclear fuel operation pool of a nuclear power plant according to the present invention can be quickly installed, conveniently stored, has high flexibility, is light in weight and convenient to move. And all parts adopt an anti-dropping design, use high-strength materials, compact structure design, and select high-reliability components, which can avoid generating additional foreign objects during the anti-foreign object process, fundamentally solve the problem of foreign object prevention in important pool parts, and reduce the risk of radioactive contamination.

[0068] Embodiment 2:

[0069] See together Figure 7 , an embodiment of the present invention also discloses a method for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant. The anti-foreign object device for the nuclear fuel operation pool of a nuclear power plant in Embodiment 1 is used, that is, this embodiment is an application scenario of the anti-foreign object device for the nuclear fuel operation pool of a nuclear power plant in Embodiment 1 of the present invention. The method for preventing foreign objects in the nuclear fuel operation pool of a nuclear power plant includes the following steps:

[0070] S100: Detachably connect several support columns 1 to the guardrails 7 in the length direction of the nuclear fuel operation pool 6 respectively, and arrange the several support columns 1 at intervals. Among them, one support column 1 is connected to one guardrail 7, and the several support columns 1 are arranged at intervals. The connection method can be welding, plugging, quick snap connection or connection through fasteners, as long as the support column 1 can be fixed.

[0071] S200: Symmetrically arrange two guide rails 2 on the opposite sides in the width direction of the nuclear fuel operation pool 6, and connect them to several support columns 1 respectively. Among them, the support column 1 is provided with several mounting parts arranged at intervals along its axial direction, and at least one mounting part is detachably connected to the guide rail 2 through fasteners. The two guide rails 2 can realize the installation height adjustment by connecting to the mounting parts at different positions. The mounting part can be a through hole, and the fastener is a bolt and nut.

[0072] S300: First, fixedly connect the sliding assembly 3 and the telescopic awning bracket, and then install the sliding assembly 3 in cooperation with the guide rail 2. The connection and fixation of the sliding assembly 3 and the telescopic awning bracket can be carried out before step S100 and step S200, or can also be carried out after step S200. Generally, the installation of the sliding assembly 3 and the telescopic awning bracket has been completed before step S100, and they are stored in the storage rack 5. When needed, they are integrally moved onto the guide rail 2.

[0073] S400: The sliding assembly 3 slides along the length direction of the guide rail 2, driving the telescopic awning bracket 4 to unfold along the guide rail 2 and distribute on the first preset length of the guide rail 2. At this time, the telescopic awning bracket 4 is in the unfolded state. It can be understood that the unfolded state can be a fully unfolded state or a semi-unfolded state. The fully unfolded state means that the telescopic awning bracket 4 is unfolded to the fully extended degree, and the semi-unfolded state is between the fully unfolded state and the contracted state. The telescopic awning bracket 4 is partially unfolded but partially not unfolded, or is fully unfolded but not fully extended, or is partially unfolded to the fully extended degree and partially in the contracted state. Similarly, the first preset length of the guide rail 2 can be the full length of the guide rail 2 or a part of the length of the guide rail 2.

[0074] It can be understood that after use, the telescopic awning bracket 4 can be retracted to the contracted state and placed on the guide rail 2 or stored on the storage rack 5. In the contracted state, the telescopic awning bracket 4 is distributed on the second preset length of the guide rail 2, and the second preset length is less than the first preset length. The second preset length is the length that the telescopic awning bracket 4 needs to occupy on the guide rail 2 in the basic state. Exactly speaking, the second preset length is the length that the sliding assembly 3 needs to occupy on the guide rail 2 in the basic state of the telescopic awning bracket 4. The second preset length can be any section on the full length of the guide rail 2, such as the right end part of the length of the guide rail 2, the left end part of the length of the guide rail 2, etc.

[0075] This foreign object prevention method effectively prevents foreign objects from falling into the reactor pool during the major overhaul of nuclear power plants, reducing the potential nuclear pollution risk. The foreign object prevention device for the nuclear fuel operation pool of nuclear power plants has a simple structure, is easy to manufacture, has a low cost, requires basically no maintenance during long-term use, and is quickly installed and convenient for storage. The device has high flexibility, is light in weight and convenient to move, and only 3-4 people are required to complete the installation.

[0076] By implementing the present invention, the following beneficial effects are achieved:

[0077] The foreign object prevention device for the nuclear fuel operation pool of the present invention forms the installation foundation of the retractable awning bracket 4 through the support columns 1 and the guide rails 2. The sliding assembly 3 drives the retractable awning bracket 4 to expand or contract, with a simple structure and quick installation. In the expanded state, it can cover the upper part of the nuclear fuel operation pool 6, isolating the nuclear fuel operation pool 6 from the upper external environment, preventing foreign objects from falling through the nuclear fuel operation pool 6, so as to solve the problem of foreign objects falling into the upper part of the nuclear fuel operation pool 6 area, fundamentally eliminating potential safety hazards and ensuring the safe operation of the power plant.

[0078] The foreign object prevention method for the nuclear fuel operation pool of the present invention realizes convenient installation and the overall fixation of the foreign object prevention device for the nuclear fuel operation pool of the nuclear power plant by detachably connecting the support columns 1 to the guardrail 7. The sliding assembly 3 drives the retractable awning bracket 4 to expand and can cover the upper part of the nuclear fuel operation pool 6, isolating the nuclear fuel operation pool 6 from the upper external environment, preventing foreign objects from falling through the nuclear fuel operation pool 6, so as to solve the problem of foreign objects falling into the upper part of the nuclear fuel operation pool 6 area, fundamentally eliminating potential safety hazards and ensuring the safe operation of the power plant.

[0079] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can also be made, and these all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above embodiments; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A foreign body prevention device for a nuclear fuel operation pool in a nuclear power plant, characterized in that: The telescopic canopy bracket comprises a plurality of supporting columns (1), at least two guide rails (2), a plurality of sliding components (3) and a telescopic canopy bracket (4), wherein each of the guide rails (2) is connected to a plurality of the supporting columns (1), the two guide rails (2) are arranged opposite to each other along a first direction and extend respectively along a second direction, and the first direction and the second direction are perpendicular to each other; the bottom of the telescopic canopy bracket is connected to a plurality of the sliding components (3), and the sliding components (3) are slidably connected to the guide rails (2); The retractable canopy support (4) comprises an expanded state and a retracted state: in the expanded state, the retractable canopy support (4) is distributed over a first preset length of the guide rail (2); in the retracted state, the retractable canopy support (4) is distributed over a second preset length of the guide rail (2); the first preset length is greater than the second preset length and less than the length of the guide rail (2).

2. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 1, characterized in that: The retractable canopy support (4) comprises a plurality of support frames (41), a flexible canopy (42) and a plurality of connecting pieces, wherein the flexible canopy (42) covers the plurality of support frames (41), and each of the support frames (41) is connected to the flexible canopy (42) via the plurality of connecting pieces; the opposite ends of each of the support frames (41) are respectively connected to at least one of the sliding components (3); In the unfolded state, the length of the flexible canopy (42) is greater than or equal to the first preset length.

3. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 2, characterized in that: The support frame (41) comprises at least two vertical poles (411) and at least one crossbeam (412); the crossbeam (412) is respectively connected to the two vertical poles (411) and connected to the flexible canopy (42) via the connecting member; the bottom of each vertical pole (411) is connected to at least one sliding assembly (3).

4. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 3, characterized in that: The support frame (41) further comprises at least two diagonal braces (413) and a plurality of reinforcing rods (414); the two diagonal braces (413) and the cross beam (412) together form a triangular support structure; and each reinforcing rod (414) is respectively connected to the diagonal brace (413) and the cross beam (412).

5. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 3, characterized in that: The support frame (41) further comprises at least two mounting seats (415), each of the mounting seats (415) being respectively connected to the bottom of the vertical pole (411) and the sliding assembly (3).

6. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 5, characterized in that: The sliding assembly (3) comprises at least one pulley (31), and the pulley (31) is rotationally connected to the mounting seat (415) via a connecting shaft.

7. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 1, characterized in that: The supporting column (1) is provided with a plurality of mounting portions spaced apart along its axial direction, and at least one of the mounting portions is detachably connected to the guide rail (2) via a fastener.

8. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 1, characterized in that: It also comprises a storage rack (5) for storing the sliding assembly (3) and the retractable canopy support (4), and the storage rack (5) is provided with at least one side opening.

9. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 8, characterized in that: The storage rack (5) comprises at least two storage rails (51) and a fixing assembly (52) for accommodating a plurality of the sliding assemblies (3); the fixing assembly (52) is respectively connected to the two storage rails (51); and each storage rail (51) is detachably spliced ​​with the guide rail (2); The length of the storage rail (51) is greater than or equal to the second preset length, and the distance between the two storage rails (51) is the same as the distance between the two sliding components (3) arranged opposite to each other.

10. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 9, characterized in that: The fixing assembly (52) comprises at least two fixing columns (521) and at least one fixing beam (522), each of the fixing beams (522) being connected to two of the fixing columns (521) respectively, and each of the fixing columns (521) being connected to the storage rail (51); the fixing columns (521) extend upward and have a height greater than the total height of the sliding assembly (3) and the retractable canopy bracket (4).

11. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 10, characterized in that: The storage rack (5) further comprises a plurality of lifting ears (53), and the plurality of lifting ears (53) are symmetrically connected to the fixed beam (522).

12. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 9, characterized in that: The storage rack (5) further comprises at least two connecting bottom plates (54), wherein the connecting bottom plates (54) are connected to the bottom of the storage rail (51) and are connected to the fixing assembly (52) on the outer side of the storage rail (51).

13. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 9, characterized in that: The fixing assembly (52) comprises a plurality of fixing plates, each of which is connected to two of the storage rails (51) respectively.

14. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to claim 9, characterized in that: The storage rack (5) further comprises a lifting structure, wherein the lifting structure is arranged at the bottom of the storage rail (51) and / or the fixing assembly (52).

15. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to any one of claims 8 to 14, characterized in that: The storage rack (5) further comprises a moving assembly (55), wherein the moving assembly (55) is installed at the bottom of the storage rack (5).

16. The foreign body prevention device for the nuclear fuel operation pool of a nuclear power plant according to any one of claims 1 to 14, characterized in that: The connecting piece is a flexible connecting piece.

17. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to any one of claims 2 to 6, characterized in that: The flexible canopy (42) is a translucent tarpaulin.

18. The foreign matter prevention device for the nuclear fuel operation pool of a nuclear power plant according to any one of claims 2 to 6, characterized in that: The retractable canopy support (4) further comprises a lighting device, which is disposed at the lower part of the flexible canopy (42) and is fixedly connected to the supporting frame (41).

19. A method for preventing foreign matter from entering a nuclear fuel operation pool in a nuclear power plant, characterized in that: The device for preventing foreign matter from a nuclear fuel operation pool in a nuclear power plant according to any one of claims 1 to 18 comprises the following steps: S100: a plurality of the support columns (1) are detachably connected to the guardrails (7) in the length direction of the nuclear fuel operation pool (6), and the plurality of the support columns (1) are arranged at intervals; S200: symmetrically arranging the two guide rails (2) on opposite sides of the nuclear fuel operation pool (6) in the width direction, and respectively connecting them to a plurality of the support columns (1); S300: pre-connecting and fixing the sliding assembly (3) and the telescopic canopy support, and then installing the sliding assembly (3) in coordination with the guide rail (2); S400: The sliding component (3) slides along the length direction of the guide rail (2), driving the retractable canopy bracket (4) to unfold along the guide rail (2) and distribute over a first preset length of the guide rail (2).

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