Nuclear power station pool foreign matter collecting and transferring device

Abstract

The nuclear power station pool foreign matter collecting and transferring device comprises a shielding container and a collecting basket, the shielding container comprises a first containing cavity and is provided with shielding materials capable of shielding rays, and the collecting basket comprises a second containing cavity and can be arranged in the first containing cavity; and drainage structures are arranged on the collecting basket and the shielding container. According to the nuclear power station pool foreign matter collecting and transferring device, after the foreign matter is collected, the foreign matter does not need to be transferred underwater again, the collecting basket can be placed in the shielding container or the foreign matter is directly placed in the shielding container, and the shielding container can shield the foreign matter with high radiation dose; radiation of foreign matters to human bodies and the environment can be reduced, the operation risk of personnel is reduced, and use is simpler and more convenient; the shielding container and the collecting basket can be used in cooperation and can also be used independently, and on-site flexible use is facilitated; the arrangement of the drainage structure facilitates the discharge of radioactive residual water in the foreign matters, so as to reduce the foreign matter collection and transfer weight.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary devices of nuclear power plants, and more specifically to a foreign matter collection and transportation device for a water pool of a nuclear power plant. Background Art

[0002] During nuclear power plant operation, foreign matter is prone to appearing in refueling pools and reactors. If not promptly removed, it can impact fuel assembly safety and unit stability. During nuclear power plant unit overhauls, foreign matter may have come into contact with the primary coolant, contaminating it. Furthermore, foreign matter may have been generated during unit operation and has a high probability of activation, resulting in a high radioactive dose. Therefore, necessary shielding measures must be implemented during the salvage, collection, and transportation of foreign matter to ensure the safety of workers.

[0003] Therefore, how to reduce the risks in the process of collecting and transporting foreign matter and ensure the safety of the process of collecting and transporting underwater foreign matter in nuclear power plants has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a nuclear power plant pool foreign body collection and transportation device to reduce the risks in the foreign body collection and transportation process and ensure the safety of the nuclear power plant underwater foreign body collection and transportation process.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A foreign body collection and transportation device for a nuclear power plant water pool, comprising:

[0007] A shielding container, the shielding container includes a first accommodating cavity, and the shielding container is provided with a shielding material capable of shielding radiation;

[0008] The collecting basket includes a second accommodating cavity. The collecting basket can be placed in the first accommodating cavity. Both the collecting basket and the shielding container are provided with drainage structures.

[0009] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transfer device, the collection basket includes a panel arranged on the top of the collection basket, and the filter element stripping piece is provided on the panel.

[0010] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transfer device, an inlet for foreign matter to enter is opened on the enclosure, and the filter element stripping parts include multiple ones arranged along the circumference of the inlet.

[0011] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transportation device, the filter element stripping piece is an elastic piece, and the shape of the filter element stripping piece includes one or more of a trapezoid, a rectangle, and a triangle.

[0012] Optionally, in the above-mentioned nuclear power plant pool foreign matter collection and transfer device, the shielding container includes a container body and a container cover matched with the container body, and the container cover is provided with a first handle.

[0013] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transportation device, the shielding material includes a multi-layer lead shielding layer arranged between the inner wall of the container body and the outer wall of the container body.

[0014] Optionally, in the above-mentioned nuclear power plant pool foreign matter collection and transfer device, a boss is provided on the bottom plate of the container body, and the drainage structure includes drainage holes provided on both sides of the boss.

[0015] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transfer device, the drainage structure also includes a filter screen arranged on the collection basket.

[0016] Optionally, in the above-mentioned nuclear power plant water pool foreign matter collection and transfer device, a second handle is provided on the container body, and a third handle is provided on the collection basket.

[0017] Optionally, in the above-mentioned nuclear power plant pool foreign matter collection and transfer device, the shielding container and the collection basket are both made of stainless steel.

[0018] It can be seen from the above scheme that the nuclear power plant pool foreign matter collection and transfer device disclosed by the utility model does not need to transfer the foreign matter underwater again after collecting the foreign matter. The collection basket can be placed in the shielding container or the foreign matter can be directly placed in the shielding container. The setting of the shielding container can shield foreign matter with a high radiation dose, reduce the radiation of foreign matter to the human body and the environment, reduce the risk of personnel operation, and is simpler and more convenient to use; the shielding container and the collection basket can be used together or separately, which is convenient for flexible use on site; the setting of the drainage structure facilitates the discharge of radioactive residual water in the foreign matter to reduce the weight of foreign matter collection and transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a foreign body collection and transfer device for a nuclear power plant water pool disclosed in an embodiment of the present utility model;

[0021] Figure 2 This is a schematic structural diagram of a shielding container disclosed in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic structural diagram of a collection basket disclosed in an embodiment of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of the enclosure of the collection basket disclosed in an embodiment of the present utility model.

[0024] Among them, 1. shielding container, 11. container cover, 12. first handle, 13. outer wall, 14. lead shielding layer, 15. inner wall, 16. second handle, 17. bottom plate, 18. drainage hole;

[0025] 2. Collection basket, 21. Third handle, 22. Collection basket outer wall, 23. Collection basket bottom plate, 24. Enclosure, 25. Filter element peeling card. DETAILED DESCRIPTION

[0026] The core of the utility model is to disclose a foreign body collection and transportation device for a nuclear power plant pool, so as to reduce the risks existing in the process of foreign body collection and transportation, and ensure the safety of the nuclear power plant during the process of underwater foreign body collection and transportation.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, an embodiment of the utility model discloses a foreign matter collection and transportation device for a nuclear power plant pool, comprising a shielding container 1 and a collection basket 2.

[0029] The shielding container 1 includes a first accommodating chamber capable of accommodating foreign matter and is provided with a shielding material capable of shielding radiation. The collection basket 2 includes a second accommodating chamber capable of accommodating foreign matter and can be placed within the first accommodating chamber. Both the collection basket 2 and the shielding container 1 are provided with drainage structures.

[0030] During use, the foreign object is salvaged using a salvage tool and placed in a collection basket 2. The radiation dose of the foreign object is measured using underwater dose detection equipment. When the radiation dose of the foreign object is below the specified limit, the collection basket 2 is removed from the water surface and allowed to remain on the water surface for a period of time to drain the water in the collection basket 2. The foreign object can then be transported. When the radiation dose of the foreign object is higher than the specified limit, the collection basket 2 is placed underwater in a shielding container 1. The shielding container 1 is removed from the water surface and allowed to remain above the water surface for a period of time to drain the water remaining in the foreign object before further work can be carried out. When the radiation dose of the foreign object is higher than the specified limit, the foreign object can also be placed directly in the shielding container 1.

[0031] The nuclear power plant pool foreign matter collection and transfer device disclosed in the embodiment of the utility model does not need to transfer the foreign matter underwater again after collecting the foreign matter. The collection basket 2 can be placed in the shielding container 1 or the foreign matter can be directly placed in the shielding container 1. The setting of the shielding container 1 can shield foreign matter with a high radiation dose, reduce the radiation of foreign matter to the human body and the environment, reduce the risk of personnel operation, and is simpler and more convenient to use; the shielding container 1 and the collection basket 2 can be used in combination or separately, which is convenient for flexible use on site; the setting of the drainage structure facilitates the discharge of radioactive residual water in the foreign matter, so as to reduce the weight of the collected and transferred foreign matter.

[0032] like Figure 3 As shown, in some specific embodiments, the collection basket 2 includes a collection basket outer wall 22, a collection basket bottom plate 23 disposed at the bottom of the collection basket outer wall 22, and a panel 24 disposed at the top of the collection basket 2. The panel 24 is provided with a filter element stripper 25. It should be noted that when an underwater vacuum cleaner is used to salvage foreign objects, the underwater vacuum cleaner is placed in the collection basket 2. When the underwater vacuum cleaner is removed from the collection basket 2, the filter element stripper 25 can block the filter element of the underwater vacuum cleaner, thereby separating the underwater vacuum cleaner and the filter element. This allows the filter element and foreign objects to remain in the collection basket 2, preventing foreign objects from adhering to the filter screen of the underwater vacuum cleaner, resulting in an excessive radiation dose to the underwater vacuum cleaner body and preventing it from being discharged. The collection basket 2 is preferably cylindrical, with a maximum diameter of preferably 185 mm and a maximum height of preferably 225 mm. In one specific embodiment, the outer wall of the collection basket 2 is a cylinder with a diameter of 165 mm and a height of 220 mm.

[0033] like Figure 4 As shown, in some specific embodiments, the enclosure 24 is annular and defines an inlet for foreign matter to enter, namely, a hollow portion in the middle of the annular enclosure 24. The filter element stripping members 25 include multiple members arranged circumferentially around the inlet. The provision of the annular enclosure 24 ensures the passage of foreign matter while reducing the possibility of foreign matter drifting away.

[0034] Specifically, the filter stripper 25 is an elastic member and can be shaped like a trapezoid, rectangle, square, inverted triangle, or inverted cone, with no particular limitation. Each filter stripper 25 is arranged obliquely to the enclosure 24 and tilted inwardly toward the collection basket 2. When an underwater vacuum cleaner is placed into the collection basket 2, the elasticity of the filter stripper 25 allows the underwater cleaner to enter. When the underwater cleaner is removed, the filter stripper 25 blocks the filter element, allowing it to detach from the underwater cleaner and remain in the collection basket 2. The provision of the filter stripper 25 facilitates foreign matter collection, broadens the scope of application of nuclear power plant water tank foreign matter collection and transfer devices, and provides greater flexibility.

[0035] like Figure 2 As shown, in some specific embodiments, the shielding container 1 includes a container body and a container cover 11, and a first handle 12 is provided on the container cover 11. Specifically, the container cover 11 and the container body can be hingedly connected, or the two can be disconnected, and the container cover 11 and the container body can be separated. After placing foreign matter into the container body, the container cover 11 is covered to seal the container body. In some specific embodiments, the container body is cylindrical in shape, and the inner circle of the bottom surface of the container cover 11 is milled to form an outer edge to better fit the container body and play a stabilizing role. The first handle 12 can be used in conjunction with a rope, making it convenient for staff to lift and close the container cover 11 by pulling the rope tied to the first handle 12.

[0036] In some specific embodiments, the shielding material 14 includes a multi-layer lead shielding layer 14 disposed between the inner wall 15 and the outer wall 13 of the container body. Specifically, the container body includes an inner wall 15, an outer wall 13, a lead shielding layer 14 disposed between the inner wall 15 and the outer wall 13, and a bottom plate 17 disposed at the bottom of the inner wall 15 and the outer wall 13. The inner wall 15, the outer wall 13, and the bottom plate 17 are all made by machining, welding, and other methods, and have a smooth surface, which can be achieved by polishing burrs during the machining process. This method can reduce the contamination of the container body by foreign matter and facilitate cleaning. The lead shielding layer 14 is preferably 3 mm thick and has a lead content of 99.9%. The protection ratio of each layer of lead shielding layer against gamma rays reaches 50%. The arrangement of the multi-layer lead shielding layer 14 can enhance the shielding performance. The size of the container body is not specifically limited and can be determined according to actual needs.

[0037] In one specific embodiment, the inner wall 15 of the container body is a cylinder with a diameter of 190 mm, constructed from 3 mm thick 1Cr18Ni9Ti stainless steel plates, and has a height of 250 mm. The outer wall 13 of the container body is a cylinder with a diameter of 220 mm, constructed from 3 mm thick 1Cr18Ni9Ti stainless steel plates, and has a height of 250 mm. Both the inner and outer walls 15 and 13 of the container body are smooth and free of burrs or protrusions to prevent the adhesion of radioactive particles. The lead shielding layer is formed by wrapping three layers of bare lead sheeting, each 3 mm thick. Specifically, a lead wrapping process is employed, with three 3 mm layers of lead sheeting containing 99.9% lead being wrapped around the inner wall 15 of the container body. A stainless steel sheet is then wrapped around the outer surface of the lead shielding layer 14 for securing. This lead wrapping process avoids the need for high-temperature lead melting on the lead shielding layer 14, simplifying the processing and reducing the potential for gas contamination. To reduce the size of the shielding container 1, the diameter of the container body is preferably a maximum of 255 mm, and the maximum height is preferably 350 mm.

[0038] In this embodiment, since the thickness of the inner wall 15 and the outer wall 13 of the container body is 6 mm in total, the half-thickness of the stainless steel plate for gamma rays is 24 mm, and the radiation dose after shielding is: (1 / 2) of the initial radiation dose 6 / 24 =84%; the thickness of the lead shielding layer 14 is 3mm per layer, and there are 3 layers in total, totaling 9mm. The half-thickness of the lead shielding against gamma rays is 3mm, so the radiation dose after shielding is: (1 / 2) of the initial radiation dose 9 / 3 =12.5%; then, after the shielding of the lead shielding layer 14 and the stainless steel plate, the overall shielding effect is: 1-12.5%84%=89.5%. This shows that the three-layer lead shielding layer 14 can shield nearly 90% of the radiation dose, effectively reducing radiation damage to surrounding personnel and achieving a good shielding effect. It should be noted that this is only an example and is not intended to be limiting. In actual use, the thickness of the inner wall 15 and outer wall 13 of the container body, as well as the number and thickness of the lead shielding layer 14 layers, can be appropriately selected according to actual needs.

[0039] To facilitate drainage, Figure 1 and Figure 2 As shown, in some specific embodiments, a boss is provided on the bottom plate 17 of the container body, and the shape of the boss is not specifically limited. The drainage structure includes drainage holes 18 provided on both sides of the boss. Specifically, the axial direction of the drainage hole 18 is at a certain inclination angle to the plane where the bottom plate 17 is located to meet the drainage effect while ensuring that the shielding effect is not reduced. The specific angle of the inclination is not specifically limited.

[0040] In one specific embodiment, base plate 17 is a disc-shaped member with a trapezoidal boss. Its diameter is 220 mm, the boss diameter is 60 mm, the boss elevation angle is 135°, the maximum thickness at the boss is 45 mm, and the edge thickness is 35 mm. It is made of carbon steel. Drain holes 18 are circular holes with a diameter of 10 mm, located 70 mm apart on either side of base plate 17. The axial direction of drain holes 18 is inclined at a 30° angle to the plane of base plate 17. It should be noted that this is merely an example and is not intended to be limiting.

[0041] The drainage structure also includes a filter screen arranged on the collection basket 2. Specifically, a filter screen can be arranged on the collection basket bottom plate 23, or a mesh plate can be used to make the collection basket outer wall 22 and the collection basket bottom plate 23. This method can achieve better drainage effect. The specific size of the mesh of the mesh plate can be determined according to actual needs. At the same time, the setting of the mesh plate can filter small foreign matter in the pool. The mesh plate is preferably a mesh steel plate.

[0042] In order to facilitate the transportation of foreign matter after collection, in some specific embodiments, a second handle 16 is provided on the container body. Specifically, the number of the second handles 16 includes two, and they are provided on both sides of the middle part of the container body. The second handle 16 is welded to the container body and a steel bar with a diameter of 10 mm is selected. It has a certain inclination angle with the container body, preferably an inclination angle of 35°. This setting method can better balance the strength of the second handle 16 and the weight of the container body. The setting of the second handle 16 can realize fast and convenient manual transportation, or realize underwater transportation through tools such as rope slings. A third handle 21 is provided on the collection basket 2. Specifically, the third handle 21 is provided on the enclosure 24, and includes two, and the two third handles 21 are respectively provided on both sides of the enclosure 24. The setting of the third handle 21 is convenient for use with a rope to realize the underwater movement operation of the collection basket 2.

[0043] The nuclear power plant pool foreign matter collection and transfer device disclosed in the embodiment of the utility model has a container 1 and a collection basket 2 both made of stainless steel. Stainless steel is a commonly used material that is easy to purchase and has low cost, thus having good economic efficiency.

[0044] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0045] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0046] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0047] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help you understand the core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A foreign body collection and transportation device for a nuclear power plant pool, characterized in that: include: A shielding container (1), the shielding container (1) comprising a first accommodating cavity, the shielding container (1) being provided with a shielding material capable of shielding radiation; A collection basket (2), the collection basket (2) comprising a second accommodating cavity, the collection basket (2) being capable of being placed in the first accommodating cavity, and the collection basket (2) and the shielding container (1) both being provided with drainage structures.

2. The nuclear power plant pool foreign matter collection and transportation device according to claim 1, characterized in that: The collecting basket (2) comprises a panel (24) arranged on the top of the collecting basket (2), and a filter element stripping piece (25) is provided on the panel (24).

3. The nuclear power plant pool foreign matter collection and transportation device according to claim 2, characterized in that: An inlet for foreign matter to enter is provided on the enclosure plate (24), and the filter element stripping member (25) comprises a plurality of filter element stripping members (25) arranged along the circumference of the inlet.

4. The nuclear power plant pool foreign matter collection and transportation device according to claim 3, characterized in that: The filter element stripping piece (25) is an elastic piece, and the shape of the filter element stripping piece (25) includes one or more of a trapezoid, a rectangle, and a triangle.

5. The nuclear power plant pool foreign matter collection and transportation device according to claim 1, characterized in that: The shielding container (1) comprises a container body and a container cover (11) matched with the container body, and a first handle (12) is provided on the container cover (11).

6. The nuclear power plant pool foreign matter collection and transportation device according to claim 5, characterized in that: The shielding material comprises a multi-layer lead shielding layer (14) arranged between an inner wall (15) of the container body and an outer wall (13) of the container body.

7. The nuclear power plant pool foreign matter collection and transportation device according to claim 5, characterized in that: A boss is provided on the bottom plate (17) of the container body, and the drainage structure comprises drainage holes (18) provided on both sides of the boss.

8. The nuclear power plant pool foreign matter collection and transportation device according to claim 7, characterized in that: The drainage structure further comprises a filter screen arranged on the collection basket (2).

9. The nuclear power plant pool foreign matter collection and transportation device according to claim 5, characterized in that: A second handle (16) is provided on the container body, and a third handle (21) is provided on the collection basket (2).

10. The nuclear power plant pool foreign matter collection and transportation device according to any one of claims 1 to 9, characterized in that: The shielding container (1) and the collection basket (2) are both made of stainless steel.

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