Fishing tool for foreign matters in nuclear power station water pool

Abstract

The utility model discloses a tool for salvaging foreign matters in a nuclear power station pool, which comprises a counterweight assembly, a salvaging piece with an adhesive tape adhered to the bottom and a regulation and control piece for being held by a hand or clamped by equipment, the salvaging piece is fixedly connected with the counterweight assembly, and the salvaging piece partially or completely protrudes out of the counterweight assembly along the length direction; and the regulation and control part is connected with the counterweight assembly so as to regulate and control the counterweight assembly. According to the fishing tool for the foreign matter in the nuclear power station pool, the underwater fishing angle and position of the fishing piece can be adjusted through the adjusting and controlling piece, and fine and light foreign matter in an irregular area at the bottom of the pool and an area or an edge area where the foreign matter cannot be vertically fished due to shielding of equipment and facilities above the foreign matter can be accurately fished. The fishing piece pasted with the adhesive tape can accurately fish foreign matters at the bottom of the water pool, particularly can accurately fish residual linear objects, eliminates the risk that the linear objects enter a primary loop in the water drainage process of the water pool, and ensures safe operation of primary loop system equipment.

Description

Technical Field

[0001] This utility model relates to the field of foreign object retrieval technology in nuclear power plants, and in particular to a tool for retrieval of foreign objects inside a nuclear power plant pool. Background Technology

[0002] Traditional methods for retrieving foreign objects from nuclear power plant pools involve attaching tape to the bottom of a sledgehammer and securing it with nylon rope. The rope is lowered, and once the sledgehammer reaches the object, a collection basket is lowered near it. The sledgehammer is then quickly lowered again, and the object is picked up using the tape. After successful retrieval, both the sledgehammer and the object are placed in the collection basket and then lifted ashore. This method primarily targets sheet-like, linear, and relatively lightweight objects at the bottom of the pool. However, this sledgehammer method has limitations. It cannot accurately retrieve sheet-like, linear, or relatively lightweight objects located at the pool's edge, nor can it retrieve objects obstructed by equipment or facilities above the pool. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tool for retrieving foreign objects from inside a nuclear power plant pool.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a tool for retrieving foreign objects inside a nuclear power plant pool, including a counterweight assembly, a retrieval component with adhesive tape pasted on its bottom, and an adjustment control for hand-held or equipment clamping. The retrieval component is fixedly connected to the counterweight assembly, and part or all of the retrieval component protrudes from the counterweight assembly along its length. The adjustment control is connected to the counterweight assembly to facilitate the adjustment of the counterweight assembly.

[0005] In some embodiments, the counterweight assembly includes a connecting plate and a counterweight plate connected to the salvage component, wherein the connecting plate is fixedly connected to the counterweight plate and divides the counterweight component into equal parts along the width direction;

[0006] The connecting plate is provided with a plurality of mounting holes spaced apart along its length.

[0007] The adjustment control consists of two pull ropes, each connected to a different mounting hole.

[0008] In some embodiments, each of the pull cords is connected to any of the mounting holes via a shackle.

[0009] In some embodiments, the counterweight assembly further includes two side plates, which are disposed at both ends of the connecting plate along its length and are respectively connected and fixed to the connecting plate and the counterweight plate;

[0010] The salvage component is welded and fixed to any of the side plates.

[0011] In some embodiments, the counterweight plate is provided with a plurality of through holes, which are distributed on both sides of the connecting plate.

[0012] In some embodiments, the retrieval component is a plate, and the bottom surface of the retrieval component is on the same plane as the bottom surface of the connecting plate, or the bottom surface of the retrieval component protrudes from the bottom surface of the connecting plate.

[0013] In some embodiments, the connecting plate and the counterweight plate are of the same length, and the connecting plate and the counterweight plate are respectively welded and fixed to the two side plates.

[0014] In some embodiments, a plurality of the mounting holes are equidistantly arranged along the length direction of the connecting plate.

[0015] In some embodiments, the overall length of the counterweight assembly and the retrieval component is 1000mm to 1200mm, and the width of the counterweight assembly and the retrieval component is 100mm to 110mm.

[0016] In some embodiments, the adjustment control is a long rod, which is detachably connected to or welded to the counterweight assembly.

[0017] By implementing this utility model, the following beneficial effects can be achieved:

[0018] This utility model discloses a foreign object retrieval tool for nuclear power plant pools, comprising a counterweight assembly, a retrieval component with adhesive tape attached to its bottom, and an adjustment control for handheld or clamping. The retrieval component is fixedly connected to the counterweight assembly, and part or all of the retrieval component protrudes from the counterweight assembly along its length. The adjustment control is connected to the counterweight assembly to facilitate adjustment of the counterweight assembly. This foreign object retrieval tool for nuclear power plant pools allows adjustment of the retrieval component's underwater retrieval angle and position via the adjustment control, enabling precise retrieval of small, lightweight foreign objects in irregular areas at the bottom of the pool, areas where equipment or facilities above the foreign object prevent vertical retrieval, or edge areas. The adhesive tape attached to the retrieval component allows for precise retrieval of foreign objects from the bottom of the pool, especially residual linear objects, reducing the impact on the primary circuit operation of the nuclear power plant, eliminating the risk of linear objects entering the primary circuit during reactor pool drainage, and ensuring the safe operation of the nuclear power plant's primary circuit system equipment. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a foreign object retrieval tool for a nuclear power plant pool according to an embodiment of the present invention; wherein, the pull rope in the figure is a partial structure;

[0021] Figure 2 yes Figure 1 A front view of the foreign object retrieval tool inside the pool of a nuclear power plant;

[0022] Figure 3 yes Figure 1 Left view of the foreign object retrieval tool inside the pool of the China National Nuclear Corporation (CNNC) power plant;

[0023] Figure 4 yes Figure 1 A top view of the foreign object retrieval tool inside the pool of the China National Nuclear Corporation (CNNC).

[0024] Among them, 1-counterweight assembly, 11-connecting plate, 12-counterweight plate, 13-side plate, 14-mounting hole, 15-through hole, 2-retrieval component, 3-pull rope, 4-shackle. Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] See Figures 1 to 4 This utility model discloses a foreign object retrieval tool for nuclear power plant pools, applicable to the retrieval of foreign objects inside reactor pools, component pools, spent fuel pools, canning pools, and transfer pools within nuclear power plants. It is particularly suitable for retrieving sheet-like, linear, and relatively lightweight foreign objects located at the pool bottom edge, in pool bottom areas where equipment or facilities obstruct the view above the object, and in other areas where vertical retrieval is not possible. The technical solution of this nuclear power plant pool foreign object retrieval tool will be described below using a reactor pool as an example.

[0030] The foreign object retrieval tool inside the nuclear power plant pool includes a counterweight assembly 1, a retrieval component 2 with adhesive tape attached to its bottom, and an adjustment control for handheld or equipment clamping. The retrieval component 2 is fixedly connected to the counterweight assembly 1, and part or all of the retrieval component 2 protrudes from the counterweight assembly 1 along its length. The adjustment control is connected to the counterweight assembly 1 to facilitate the adjustment of the counterweight assembly 1. Figures 1 to 4 An embodiment of the adjustment control with two pull ropes 3 is shown. The following is a detailed description of this embodiment with two pull ropes 3 as the adjustment control.

[0031] Specifically, the counterweight assembly 1 is made of stainless steel and is used to install the pull rope 3 and the salvage component 2, providing gravity to counteract buoyancy. The pull rope 3 can be made of nylon, with each operator holding one rope in each hand to adjust the angle and position of the counterweight assembly 1 and the salvage component 2 underwater. The pull rope 3 can also have a third or fourth rope of sufficient length for securing it to the external structure, ensuring that the salvage tool does not fall into the nuclear power plant pool in case of operator error. The salvage component 2 is made of stainless steel and has adhesive tape, such as double-sided tape, attached to its bottom for attaching foreign objects, especially sheet-like, thread-like, and lighter objects. The tape needs to be replaced before each operation to ensure its adhesion and prevent it from carrying foreign objects into the pool. The tape needs to have strong adhesion to firmly adhere to the salvage component 2 and maintain stable adhesion and good corrosion resistance at high temperatures; for example, halogen-free cloth-based double-sided tape can be used. By using this foreign object retrieval tool inside the nuclear power plant pool, secondary precise retrieval of residual linear objects at the bottom of the component pool, which could not be retrieved using traditional retrieval tools and methods such as heavy-duty adhesive tools, was achieved. This reduced the impact on the primary loop operation of the nuclear power plant, eliminated the risk of sheet-like, linear, and lighter foreign objects entering the primary loop during reactor pool drainage, and ensured the safe operation of the primary loop system equipment. By avoiding the high-risk operation of personnel entering the pool to retrieve foreign objects after primary loop pool drainage, critical path time for overhauls was reduced, and radiation protection dose was reduced by approximately 1 mSv. By eliminating the risk of linear and other foreign objects entering the primary loop during reactor pool drainage, the risk of damage to important equipment within the nuclear island (such as PTR and RPE drainage pumps) was eliminated. By eliminating the risk of foreign object movement during drainage, several hours of critical path time for primary loop drainage could be saved. Using this foreign object retrieval tool inside the nuclear power plant pool saved overhaul time and created certain economic value.

[0032] In some embodiments, the counterweight assembly 1 includes a connecting plate 11 and a counterweight plate 12 connected to the salvage component 2. The connecting plate 11 and the counterweight plate 12 are fixedly connected, and the counterweight plate 12 is divided equally along its width. That is, the connecting plate 11 is located on the axis of symmetry of the counterweight plate 12 and is welded and fixed to the counterweight plate 12. Alternatively, the connecting plate 11 and the counterweight plate 12 are an integral structure, such as an inverted T-shaped steel plate. This ensures a uniform weight distribution and prevents problems such as tilting of the salvage component 2 due to displacement. Specifically, the connecting plate 11 and the counterweight plate 12 are arranged perpendicular to each other. Both the connecting plate 11 and the counterweight plate 12 have sufficient weight to resist underwater buoyancy, thus jointly achieving the counterweight function, or the counterweight plate 12 has sufficient weight to resist underwater buoyancy. The corners of the connecting plate 11 and the counterweight plate 12 are rounded to prevent scratching and damage to the equipment.

[0033] The retrieval component 2 can be welded and fixed to the counterweight plate 12. The connecting plate 11 has a plurality of mounting holes 14 spaced apart along its length, and two pull ropes 3 are connected to different mounting holes 14 respectively. For example, the connecting plate 11 has ten mounting holes 14 spaced apart along its length. For ease of description, each mounting hole 14 is numbered sequentially. One pull rope 3 is connected to the first mounting hole 14, and the other pull rope 3 can be connected to the tenth mounting hole 14; or, one pull rope 3 is connected to the third mounting hole 14, and the other pull rope 3 can be connected to the eighth mounting hole 14, and so on, including various connection combinations. Different connection positions of the two pull ropes 3 can adjust the amplitude, position, and angle of the counterweight component 1 and the retrieval component 2. Specifically, the connection of the two pull ropes 3 to which mounting holes 14 is selected according to the amplitude, position, and angle required for adjustment at the opportune moment. Preferably, the plurality of mounting holes 14 are equidistantly arranged along the length of the connecting plate 11.

[0034] In some embodiments, each pull cord 3 is connected to any one of the mounting holes 14 via a shackle 4. The shackle 4 facilitates quick and easy switching between connections to different mounting holes 14. The shackle 4 is made of stainless steel and can be a pin-type shackle, a bolt-type shackle, or a swivel shackle, etc. Each pull cord 3 has a single-wire structure or a double-wire structure with the ends connected. Understandably, in some other embodiments, the pull cord 3 can also be directly tied to the mounting hole 14 for connection.

[0035] Understandably, the pull rope 3 can be replaced by a long rod. That is, the adjustment mechanism is a long rod, which is detachably connected to or welded to the counterweight assembly 1. For example, a sufficiently long rod can be detachably or fixedly connected to the connecting plate. Using a long rod allows the same function as the pull rope 3 in adjusting the angle and position of the counterweight assembly 1 and the salvage component 2 during underwater salvage. Specifically, either of the two pull ropes 3 can be replaced by a long rod; that is, a combination of one long rod and one pull rope, or two long rods can each replace one pull rope 3. The long rod can be a single, continuous structure, a folding structure, or a telescopic structure. The long rod is an alternative to the pull rope 3, not shown in the figure.

[0036] The foreign object retrieval tool inside the nuclear power plant pool can cover the application range of traditional heavy hammer retrieval tools in various areas such as the reactor water pool, component pool, spent fuel pool, tank filling pool, and transfer pool. If there is equipment or facilities obstructing the retrieval of foreign objects at the bottom of the pool, making vertical retrieval impossible, the adjustable binding points of the foreign object retrieval tool inside the nuclear power plant pool can be used. That is, two pull ropes 3 can be detachably connected to different mounting holes 14 through shackles 4, so as to adjust the retrieval angle and orientation for precise retrieval.

[0037] In some embodiments, the counterweight assembly 1 further includes two side plates 13, which are disposed at both ends of the connecting plate 11 along its length and are respectively connected and fixed to the connecting plate 11 and the counterweight plate 12. The retrieval component 2 is welded and fixed to either side plate 13. The two side plates 13 can increase the connection area between the connecting plate 11 and the counterweight plate 12, strengthen the fixing of the connecting plate 11 and the counterweight plate 12, and provide an installation base for the retrieval component 2. The corners of the two side plates 13 are rounded to avoid scratching and damaging the equipment.

[0038] In some embodiments, the connecting plate 11 and the counterweight plate 12 are of the same length, and are welded to two side plates 13 respectively. For example, one surface of each side plate 13 is welded to both the connecting plate 11 and the counterweight plate 12. Preferably, the shape of the side plate 13 can be similar to the side view shape of the connecting plate 11 and the counterweight plate 12, such as an inverted T-shape. The top of the side plate 13 is slightly higher than the top of the connecting plate 11, and the side plate 13 is also a steel plate structure.

[0039] Understandably, in some other embodiments, the lengths of the connecting plate 11 and the counterweight plate 12 may be different. For example, the length of the connecting plate 11 may be less than the length of the counterweight plate 12, and one surface and the bottom surface of each side plate 13 may be welded and fixed to the connecting plate 11 and the counterweight plate 12, respectively. Alternatively, the length of the connecting plate 11 may be greater than the length of the counterweight plate 12, and the bottom surface of the connecting plate 11 may be welded and fixed to the counterweight plate 12 and the salvage component 2, respectively.

[0040] In some embodiments, to reduce underwater resistance, the counterweight plate 12 and the side plate 13 can each be a hollow structure. For example, the counterweight plate 12 has a plurality of through holes 15, which are distributed on both sides of the connecting plate 11. Underwater resistance is minimized as much as possible without affecting the connection of the connecting plate 11. The sizes of the plurality of through holes 15 can be the same or different. Preferably, the plurality of through holes 15 are equidistant along the length direction of the counterweight plate 12 and equidistant on both sides of the connecting plate 11, so that the weight of the counterweight plate 12 is uniform. The side plate 13 can be configured similarly to the counterweight plate 12, and will not be described in detail here.

[0041] In some embodiments, the retrieval component 2 is a plate, with its bottom surface flush with the bottom surface of the connecting plate 11, or the bottom surface of the retrieval component 2 protruding from the bottom surface of the connecting plate 11. The connecting plate 11 can prevent foreign objects from adhering to the retrieval component 2. The corners of the retrieval component 2 are rounded to prevent scratching and damage to the equipment.

[0042] Understandably, in some other embodiments, the salvage component 2 is a plate, and the counterweight plate 12 is also a plate. The salvage component 2 and the counterweight plate 12 can be an integral stainless steel plate, and the connecting plate 11 is welded and fixed to the counterweight plate 12. The side plate 13 is welded and fixed to the connecting plate 11, and is also welded and fixed to the integral structure of the counterweight plate 12 and the salvage component 2.

[0043] In some embodiments, the overall length of the counterweight assembly 1 and the retrieval component 2 is 1000mm to 1200mm, such as 1000mm, 1100mm, 1200mm, etc. The counterweight plate 12 is connected to the retrieval component 2, and the overall length of the counterweight plate 12 and the retrieval component 2 is 1000mm to 1200mm. The length of the counterweight plate 12 is the same as or similar to the length of the retrieval component 2 for ease of operation. For example, the length of the counterweight plate 12 is 550mm, 600mm, 650mm, etc., and the length of the retrieval component 2 is 650mm, 600mm, 550mm, etc. Alternatively, the length of the retrieval component 2 is greater than the length of the counterweight assembly 12, for example, the length of the retrieval component 2 is about 1.5 to 2 times the length of the counterweight assembly 12, which facilitates the removal of foreign objects in deeply obscured locations. If the side plate 13 is connected to the retrieval component 2, the overall length of the counterweight plate 12, side plate 13, and retrieval component 2 is 1000mm to 1200mm. The overall length of the counterweight plate 12 and side plate 13 is the same as or similar to the length of the retrieval component 2, which facilitates operation. It is understood that in some other embodiments, the overall length of the counterweight component 1 and the retrieval component 2 may be less than 1000mm or greater than 1200mm, depending on the actual needs. This utility model does not impose any limitations on this.

[0044] The widths of the counterweight assembly 1 and the retrieval component 2 are 100mm to 110mm, such as 100mm, 105mm, and 110mm. The widths of the counterweight assembly 1 and the retrieval component 2 can be the same or different; for example, the width of the side plate 13 can be greater than the width of the counterweight plate 12 or the retrieval component 2. The core principle regarding the length and width settings of the counterweight assembly 1 and the retrieval component 2 is to ensure applicability to pool bottom areas where equipment or facilities obstruct the view of foreign objects, as well as other areas where vertical retrieval is impossible. The specific settings are determined based on actual needs.

[0045] Understandably, using foreign object retrieval tools inside the nuclear power plant pool carries risks of tools falling into the pool, radiation exposure, and personnel contamination. To minimize these risks, certain checks must be conducted before or during retrieval, such as: 1. Conducting a loosening check on the foreign object retrieval tools before and after immersion in water. During work, carefully control personal belongings and tools, securing personal items with tape. Take precautions to prevent small items from falling into the water; all tools must be securely fastened to the person. 2. Prepare the foreign object retrieval tools and other materials within the low background zone, i.e., the radiation protection zone. Obtain a high-radiation work permit in advance. Before removing the object from the water, radiation protection personnel must measure its radiation level. 3. Wear necessary contamination protective equipment.

[0046] Specifically, before the foreign object retrieval tools enter the pool of the nuclear power plant to retrieve foreign objects, preparatory work needs to be carried out, such as: 1. Preparing protective equipment: paper clothing, paper hats, latex gloves, shoe covers, etc. 2. Laying out the area for contaminated items and the foreign object retrieval work area before carrying out the specific operation. 3. The operators wear additional protective equipment, such as paper clothing, latex gloves, masks, shoe covers, etc. 4. Attaching tape to the bottom of the retrieval component 2 and binding the pull rope 3 to the connecting plate 11 for fixation.

[0047] After preparation, the foreign object retrieval operation will be carried out using the following methods:

[0048] The foreign object retrieval tool inside the nuclear power plant pool is placed above the pool, and the pull rope 3 is slowly lowered. During the descent, continuous observation is conducted to avoid equipment and locate the foreign object. Once the retrieval piece 2 reaches above the foreign object, the foreign object collection basket is lowered to its vicinity. The retrieval piece 2 is then quickly lowered, and the foreign object is picked up using adhesive tape. After successful pickup, both the retrieval piece 2 and the foreign object are placed in the foreign object collection basket. They are then lifted out of the pool together. As the basket rises, radiation protection personnel continuously monitor the foreign object dose and determine the appropriate further handling based on the object's specific characteristics, such as radiation levels. Finally, after the foreign object retrieval is complete, the equipment is dismantled. Simultaneously, cleaning supplies and yellow plastic bags are prepared to collect any contaminated pull rope 3, and the site is cleaned. This completes one foreign object retrieval operation.

[0049] In some other embodiments, a long pole is used instead of the pull rope 3, and the method of foreign object retrieval differs slightly, as follows: After attaching tape to the bottom of the retrieval piece 2, the long pole is connected and fixed to the connecting plate 11. The long pole is hoisted to the inside of the nuclear power plant pool, with the foreign object retrieval tool completely off the ground and positioned above the pool, and then slowly lowered. During the lowering process, continuous observation is conducted to avoid equipment and locate the specific position of the foreign object; the pole can be moved left and right during lowering. When the retrieval piece 2 reaches above the foreign object, the foreign object collection basket is lowered to the vicinity of the retrieval piece 2, and the long pole is quickly lowered while the retrieval piece 2 moves rapidly downwards, using tape to adhere the foreign object. After successful retrieval, the retrieval piece 2 and the foreign object are placed in the foreign object collection basket. They are then lifted out of the pool together. As the foreign object collection basket rises, radiation protection personnel continuously monitor the foreign object dose and decide on subsequent handling based on the specific situation of the foreign object, such as radiation levels. Finally, after the foreign object retrieval is completed, the equipment is dismantled. Simultaneously, wiping supplies and yellow plastic bags are prepared to collect the contaminated pull rope 3, and the site is cleaned. This completes one foreign object retrieval operation.

[0050] By implementing this utility model, the following beneficial effects can be achieved:

[0051] This utility model discloses a foreign object retrieval tool for nuclear power plant pools. By changing the binding position of the pull rope 3, the angle and position of the retrieval component 2 can be adjusted underwater. It can accurately retrieve small and lightweight foreign objects in irregular areas at the bottom of the pool, areas where equipment or facilities above the foreign object prevent vertical retrieval, or areas at the edges. The retrieval component 2, with adhesive tape attached, can accurately retrieve foreign objects from the bottom of the pool, especially residual linear objects. This reduces the impact on the primary loop operation of the nuclear power plant, eliminates the risk of linear objects entering the primary loop during reactor pool drainage, and ensures the safe operation of the primary loop system equipment of the nuclear power plant.

[0052] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A tool for retrieving foreign objects from inside a nuclear power plant pool, characterized in that, It includes a counterweight assembly (1), a retrieval component (2) with tape attached to its bottom, and an adjustment control for hand-held or equipment clamping. The retrieval component (2) is fixedly connected to the counterweight assembly (1), and part or all of the retrieval component (2) protrudes from the counterweight assembly (1) along its length. The adjustment control is connected to the counterweight assembly (1) to facilitate adjustment of the counterweight assembly (1).

2. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 1, characterized in that, The counterweight assembly (1) includes a connecting plate (11) and a counterweight plate (12) connected to the salvage piece (2). The connecting plate (11) is fixedly connected to the counterweight plate (12) and divides the counterweight plate (12) into equal parts along the width direction. The connecting plate (11) is provided with a plurality of mounting holes (14) spaced apart along its length; The adjustment control consists of two pull ropes (3), which are connected to different mounting holes (14) respectively.

3. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 2, characterized in that, Each of the pull ropes (3) is connected to any of the mounting holes (14) via a shackle (4).

4. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 2, characterized in that, The counterweight assembly (1) also includes two side plates (13), which are located at both ends of the connecting plate (11) along its length and are respectively connected and fixed to the connecting plate (11) and the counterweight plate (12). The salvage component (2) is welded and fixed to any of the side plates (13).

5. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 2, characterized in that, The counterweight plate (12) is provided with several through holes (15), which are distributed on both sides of the connecting plate (11).

6. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 2, characterized in that, The salvage component (2) is a plate, and the bottom surface of the salvage component (2) is on the same plane as the bottom surface of the connecting plate (11) or the bottom surface of the salvage component (2) protrudes from the bottom surface of the connecting plate (11).

7. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 4, characterized in that, The connecting plate (11) and the counterweight plate (12) are of the same length, and the connecting plate (11) and the counterweight plate (12) are welded and fixed to the two side plates (13) respectively.

8. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 2 or 3, characterized in that, A number of the mounting holes (14) are equidistantly arranged along the length direction of the connecting plate (11).

9. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 1, characterized in that, The overall length of the counterweight assembly (1) and the salvage component (2) is 1000mm to 1200mm, and the width of the counterweight assembly (1) and the salvage component (2) is 100mm to 110mm.

10. The foreign object retrieval tool for the interior of a nuclear power plant pool according to claim 1, characterized in that, The adjustment control is a long rod, which is detachably connected to or welded to the counterweight assembly (1).

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