Dismantling method and dismantling device for water supply pipe of heavy water reactor

Abstract

The invention provides a heavy water reactor water supply pipe dismantling method and device, and the dismantling method comprises the steps: 1, carrying out the partition division of a fuel channel according to the connection layout of a water supply pipe and the fuel channel in a heavy water reactor plant, the plant item distribution and the transfer space condition; 2, aiming at the water supply pipes connected at different subareas of the fuel channel, determining the number and specific positions of shear points of the water supply pipes in each subarea in combination with interference limitation, broken pipe transfer size and bearing requirements of non-removable items in a plant; and step 3, shearing the water supply pipe at the shearing point by using a shearing tool, and synchronously taking down a broken pipe formed by shearing by using a clamping tool and placing the broken pipe in a collecting box.

Description

Technical Field

[0001] This invention relates to the field of heavy water reactor feedwater pipe removal technology, specifically to a method and device for removing heavy water reactor feedwater pipes. Background Technology

[0002] Heavy water reactor units have a certain design life. Before reaching the design life, key components of the reactor core, such as fuel channels, need to be replaced, a process known as pipe replacement. This is necessary to ensure the normal design life of the unit and allow it to continue operating.

[0003] Current water supply pipe removal methods primarily rely on manual intervention. The tools used have low levels of automation, and core processes such as clamping, cutting, and handling depend on manual labor, requiring personnel to be exposed to high-level radioactivity environments at close range. Moreover, the long construction period for water supply pipe removal extends reactor downtime, resulting in significant power generation losses and increased hidden costs.

[0004] Based on this, the inventors of this application propose a method and device for dismantling a heavy water reactor feedwater pipe, in order to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: This invention provides a method for dismantling a heavy water reactor feedwater pipe, comprising: Step 1: Based on the connection layout of the water supply pipes and fuel channels in the heavy water reactor building, the distribution of building items, and the transfer space conditions, divide the fuel channels into zones. Step 2: For the water supply pipes connected to different zones of the fuel channel, determine the number and specific locations of the shearing points of the water supply pipes in each zone, taking into account the interference restrictions of non-removable objects in the plant, the dimensions of the pipes to be transported, and the load-bearing requirements. Step 3: Use a cutting tool to cut the water supply pipe at the cutting point, and at the same time use a clamping tool to remove the cut pipe and place it in the collection box.

[0006] According to one embodiment of the present invention, in step 1, the top end of the water supply pipe is connected to the manifold box, and the bottom end is connected to the fuel channel through a flange; Along the vertical projection direction from the manifold to the fuel channel, the fuel channel is divided into a first section, a second section, a third section, and a fourth section from bottom to top.

[0007] According to an embodiment of the present invention, in step 2, the number of shear points of the water supply pipes corresponding to the first partition to the fourth partition increases sequentially.

[0008] According to one embodiment of the present invention, the non-removable items in step 2 include the loading and unloading machine columns and loading and unloading machine bridges inside the factory building.

[0009] According to one embodiment of the present invention, the shearing tool in step 3 includes a first movable base, a first lifting mechanism, and a shearing robot. The first lifting mechanism is mounted on the first movable base, and the shearing robot is mounted on the end of the first lifting mechanism away from the first movable base. The shearing robot is used to perform shearing operations on the water supply pipe at the shearing point.

[0010] According to one embodiment of the present invention, the clamping tool in step 3 includes a second movable base, a second lifting mechanism, and a clamping member; The second lifting mechanism is mounted on the second movable base, and the clamping member is mounted on the end of the second lifting mechanism away from the second movable base. The clamping member is used to clamp the broken pipe cut by the cutting robot.

[0011] According to one embodiment of the present invention, both the first lifting mechanism and the second lifting mechanism include a driving member and a scissor structure connected to the driving member. The driving member is mounted on the first movable base or the second movable base and is used to drive the scissor structure to extend and retract to adjust the working height of the shearing robot or the clamping member.

[0012] According to one embodiment of the present invention, the clamping tool further includes a shielding box, the shielding box being installed at one end of the second lifting mechanism away from the second movable base, and the clamping member being installed in the shielding box; The shielding box forms a sealed operating space.

[0013] According to one embodiment of the present invention, in step 3, the working state of the cutting tool and the clamping tool is controlled by a remote control terminal.

[0014] The present invention also provides a heavy water reactor feedwater pipe removal device, which employs the heavy water reactor feedwater pipe removal method described above. The removal device includes: The device includes a cutting tool, a clamping tool, and a collection box. The cutting tool is used to cut the water supply pipe at the cutting point. The clamping tool is used to hold the cut pipe. The collection box is used to collect and transport the cut pipe.

[0015] According to one embodiment of the present invention, it further includes a slide rail, wherein the cutting tool, the clamping tool and the collecting box are respectively slidably engaged with the slide rail; The length extension direction of the slide rail is consistent with the arrangement direction of the fuel channel.

[0016] According to one embodiment of the present invention, the clamping tool is provided with a shielding box, the shielding box having a sealed operating space for accommodating the operator.

[0017] The positive and progressive effects of this invention are as follows: This invention relates to a method for dismantling heavy water reactor feedwater pipes. By dividing the fuel channel into zones based on the plant layout, item distribution, and transfer conditions, and accurately matching the shearing points of the feedwater pipes in each zone, and by simultaneously advancing shearing and clamping operations, this method effectively avoids interference from non-removable items in the plant, meets the size and load-bearing requirements for pipe transfer, significantly reduces the need for manual intervention, avoids close exposure of personnel to the high-level radioactive environment, shortens the dismantling period, reduces unit downtime and power generation losses, and prevents damage to the end components of the fuel channel caused by pipe tilting and overturning. This significantly improves the safety, efficiency, and economy of feedwater pipe dismantling operations. Attached Figure Description

[0018] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a flowchart of the method for dismantling the heavy water reactor feedwater pipe according to the present invention; Figure 2 This is a schematic diagram of the installation of the water supply pipe and fuel channel of the present invention; Figure 3 This is a schematic diagram of the layout of water supply pipes and fuel channels within the factory building of this invention; Figure 4 This is a schematic diagram of the layout of the water supply pipe shear points according to the present invention; Figure 5 This is a schematic diagram of the fuel channel partitioning of the present invention; Figure 6 This is a schematic diagram of the operation of the clamping tool and the cutting tool of the present invention; Figure 7 This is a schematic diagram of the structure of the clamping tool and the cutting tool of the present invention; Figure 8 This is a schematic diagram of the slide rail arrangement of the present invention; Figure 9 This is a schematic diagram of one embodiment of the collection box of the present invention.

[0019] 1. Cutting tool; 11. First movable base; 12. First lifting mechanism; 13. Cutting robot arm; 2. Clamping tool; 21. Second movable base; 22. Second lifting mechanism; 23. Clamping component; 24. Shielding box; 3. Slide rail; 4. Collection box. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] Please refer to Figure 1 To address the problems of low automation, high radiation risk due to reliance on manual intervention, lengthy construction periods, easy damage to plant facilities and fuel passage components, and poor economic efficiency in existing heavy water reactor feedwater pipe dismantling methods, this application proposes a method for dismantling heavy water reactor feedwater pipes, comprising the following steps: S1. Based on the connection layout of the water supply pipes and fuel channels in the heavy water reactor building, the distribution of building items, and the transfer space conditions, the fuel channels are divided into zones.

[0023] like Figure 2 and Figure 3 As shown, the top of the water supply pipe is connected to the manifold box, and the bottom is connected to the fuel passage via a flange. Before dismantling the water supply pipe, the connection between the water supply pipe and the fuel passage will be disconnected to ensure that the connection is in a free state.

[0024] The connection layout of water supply pipes and fuel channels specifically refers to the overall arrangement and extension direction of the water supply pipes between the manifold box and the fuel channel.

[0025] The factory building items include the inherent structural elements of the factory building that cannot be removed, such as the columns of the loading and unloading machine and the cable trays of the loading and unloading machine.

[0026] Transfer space conditions include the load-bearing capacity and size adaptability of transfer equipment, as well as the limitations of the spatial arrangement of equipment within the plant on the transfer path.

[0027] Considering all the above constraints, the fuel passage is divided into sections along the vertical projection direction from the manifold to the fuel passage.

[0028] S2. For the water supply pipes connected to different zones of the fuel channel, determine the number and specific location of the shearing points of the water supply pipes in each zone, taking into account the interference restrictions of non-removable objects in the plant, the dimensions of the pipes to be transported, and the load-bearing requirements.

[0029] Please refer to Figure 4 The selection of the shearing point needs to take into account the interference from non-removable objects, the dimensions of the pipe to be transported, and the load-bearing requirements. Figure 4 The diagram shows the locations of four shearing points. The first shearing point is where the horizontal feedwater pipe connecting to the fuel channel first bends. Because straight pipes are easier to transport than bends, the resulting pipe break at the first shearing point is a straight pipe, thus improving the effective loading capacity of the transfer equipment. The second shearing point is located at the second bend of the horizontal feedwater pipe, where it transforms into a vertical feedwater pipe. The resulting pipe break at the second shearing point is also a straight pipe, further increasing the effective loading capacity of the transfer equipment. The third shearing point is located in the middle of the vertical feedwater pipe. Because the overall vertical length of the vertical feedwater pipe is too long, exceeding the transfer size limits of the plant's transfer equipment, it is segmented. The fourth shearing point is located at the bend where the vertical feedwater pipe turns into the horizontal feedwater pipe. The resulting pipe break is also a straight pipe, facilitating transfer. Multiple third shearing points can be set between the second and fourth shearing points. The specific number can be adjusted according to the load-bearing size and weight of the plant's transfer equipment and is not limited here.

[0030] Combination Figure 4 The layout of the water supply pipes shown and Figure 5 The diagram illustrates the zoning. The fuel channel is divided into four zones based on the water supply pipe's routing, with each zone corresponding to a specific type of water supply pipe routing. For example, in Zone 1, the water supply pipe connected to the fuel channel bends twice along a horizontal section before turning to a vertical section, extending to the height of the manifold box, and then turning back to a horizontal section to connect with the manifold box. Zone 1 requires four shear points: the first shear point, the second shear point, the third shear point, and the fourth shear point. For Zone 2, the water supply pipe connected to the fuel channel bends once along a horizontal section before turning to a vertical section, extending to the height of the manifold box, and then turning back to a horizontal section to connect with the manifold box. Therefore, Zone 2 requires three shear points: the first shear point, the third shear point, and the fourth shear point. For Zone 3, the water supply pipe connected to the fuel channel goes directly vertically upwards to the height of the manifold box before turning back to a horizontal section to connect with the manifold box. Zone 3 requires two shear points: the third shear point and the fourth shear point. For the fourth section, the water supply pipe connected to the fourth section goes vertically upward through the fuel channel to the height of the manifold box and then turns into a horizontal section to connect with the manifold box. The length of the water supply pipe corresponding to the fourth section is shorter than the length of the water supply pipe corresponding to the third section. Therefore, the number of shearing points required for the fourth section is one, which is the fourth shearing point.

[0031] By determining and optimizing the shearing point, the number of times the water supply pipe is cut can be significantly reduced, thereby improving the shearing efficiency of the water supply pipe. Because the number of shearings is reduced, the number of broken pipes will also be greatly reduced, which can also improve the transfer efficiency.

[0032] S3. Use a cutting tool to cut the water supply pipe at the cutting point, and at the same time use a clamping tool to remove the cut pipe and place it in the collection box.

[0033] Please refer to Figure 6 and Figure 7 The cutting tool 1 includes a first movable base 11, a first lifting mechanism 12, and a cutting robot 13. The first lifting mechanism 12 is mounted on the first movable base 11, and the cutting robot 13 is mounted on the end of the first lifting mechanism 12 away from the first movable base 11. The cutting robot 13 is used to cut the water supply pipe at the cutting point.

[0034] The clamping tool 2 includes a second movable base 21, a second lifting mechanism 22, and a clamping member 23. The second lifting mechanism 22 is installed on the second movable base 21, and the clamping member 23 is installed on the end of the second lifting mechanism 22 away from the second movable base 21. The clamping member 23 is used to clamp the broken pipe cut by the shearing robot 13.

[0035] Optionally, both the first lifting mechanism 12 and the second lifting mechanism 22 include a driving member and a scissor structure connected to the driving member. The driving member is installed on the first movable base 11 or the second movable base 21 and is used to drive the scissor structure to extend and retract to adjust the working height of the shearing robot 13 or the clamping member 23.

[0036] For the drive unit, there can be two drive motors, which are mounted on the first moving base 11 or the second moving base 21. The two drive motors can drive the scissor structure to retract, thereby adjusting the working height of the shearing robot 13 or the clamping member 23.

[0037] Optionally, the first lifting mechanism 12 and the second lifting mechanism 22 can also be a drive cylinder and a telescopic rod. The shearing robot 13 and the clamping member 23 can be installed on the telescopic rod, and the working height of the shearing robot 13 and the clamping member 23 can be adjusted by driving the telescopic rod through the drive cylinder.

[0038] Furthermore, the clamping tool 2 also includes a shielding box 24, which is installed at the end of the second lifting mechanism 22 away from the second moving base 21, and the clamping member 23 is installed in the shielding box 24; a sealed operating space is formed inside the shielding box 24.

[0039] That is, in the event of an emergency, workers can enter the shielded box 24 to perform clamping operations. Alternatively, the shielded box 24 can also be installed on the second lifting mechanism 22, and workers can then perform cutting operations inside the shielded box 24.

[0040] Under normal working conditions, workers use a remote control terminal to control cutting tool 1 and clamping tool 2 to cut and clamp the water supply pipe. In case of an emergency during on-site operations, workers can enter the shielded box 24 to carry out the work.

[0041] This application can prevent the broken pipe from tilting or flipping by the synchronous cooperation of the clamping tool 1 and the cutting tool 2, thereby protecting the fuel passage end components from damage.

[0042] As mentioned above, the heavy water reactor feedwater pipe removal method proposed in this application can significantly reduce the amount of cutting by dividing the fuel passage and feedwater pipe into zones, while meeting the on-site requirements, thereby greatly saving the feedwater pipe removal time and thus improving power generation efficiency.

[0043] Please continue to refer to Figures 7 to 9 This application also proposes a heavy water reactor feedwater pipe removal device, which employs the above-described heavy water reactor feedwater pipe removal method. The removal device includes: The components include a cutting tool 1, a clamping tool 2, and a collection box 4. The cutting tool 1 is used to cut the water supply pipe at the cutting point, the clamping tool 2 is used to clamp the cut pipe cut by the cutting tool 1, and the collection box 4 is used to collect and transport the cut pipe.

[0044] Optionally, it also includes a slide rail 3, with the shearing tool 1, clamping tool 2 and collection box 4 slidingly engaged with the slide rail 3; the length extension direction of the slide rail 3 is consistent with the arrangement direction of the fuel channel.

[0045] The cutting tool 1, clamping tool 2, and collection box 4 slide and engage with the slide rail 3 to reach their respective suitable working positions.

[0046] In one embodiment, the clamping tool 2 is provided with a shielding box 24, which has a sealed operating space to accommodate the operator.

[0047] Therefore, in the event of an emergency, staff can go to the shielded box 24 to carry out on-site work.

[0048] like Figure 7 As shown, the cutting tool 1 specifically includes a first movable base 11, a first lifting mechanism 12, and a cutting robot 13. The first movable base 11 can move the cutting tool 1 to a suitable position for operation, and the first lifting mechanism 12 can adjust the working height of the cutting robot 13. The cutting robot 13 is used to cut the water supply pipe at a suitable cutting point.

[0049] The clamping tool 2 specifically includes a second movable base 21, a second lifting mechanism 22, a clamping member 23, and a shielding box 24. The second movable base 21 can move the clamping tool 2 to a suitable position for operation, and the second lifting mechanism 22 can adjust the working height of the clamping member 23. The clamping member 23 is used to clamp the broken pipe cut by the cutting robot 13. The shielding box 24 is used to provide a safe operating environment for the staff. In case of an emergency on site, the staff can enter the shielding box 24 to carry out on-site operations.

[0050] A lifting mechanism can also be set for the collection box 4, so that the collection box 4 can work with the clamping part 23 to collect at high altitude. After collection, it can be transported down. In this way, the clamping tool 2 does not need to be repeatedly raised and lowered, thereby improving the overall work efficiency.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0052] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0053] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for dismantling a heavy water reactor feedwater pipe, characterized in that, include: Step 1: Based on the connection layout of the water supply pipes and fuel channels in the heavy water reactor building, the distribution of building items, and the transfer space conditions, divide the fuel channels into zones. Step 2: For the water supply pipes connected to different sections of the fuel channel, determine the number and specific location of the shearing points of the water supply pipes in each section, taking into account the interference restrictions of non-removable objects in the plant, the dimensions of the pipes to be transported, and the load-bearing requirements. Step 3: Use a cutting tool to cut the water supply pipe at the cutting point, and at the same time use a clamping tool to remove the cut pipe and place it in the collection box.

2. The method for dismantling the heavy water reactor feedwater pipe according to claim 1, characterized in that, In step 1, the top end of the water supply pipe is connected to the manifold box, and the bottom end is connected to the fuel channel through a flange. Along the vertical projection direction from the manifold to the fuel channel, the fuel channel is divided into a first section, a second section, a third section, and a fourth section from bottom to top.

3. The method for dismantling the heavy water reactor feedwater pipe according to claim 2, characterized in that, In step 2, the number of shear points of the water supply pipe corresponding to the first partition to the fourth partition increases sequentially.

4. The method for dismantling the heavy water reactor feedwater pipe according to claim 1, characterized in that, The non-removable items in step 2 include the loading and unloading machine columns and loading and unloading machine bridges inside the factory building.

5. The method for dismantling the heavy water reactor feedwater pipe according to claim 1, characterized in that, The cutting tool in step 3 includes a first movable base, a first lifting mechanism, and a cutting robot arm; The first lifting mechanism is mounted on the first movable base, and the shearing robot is mounted on the end of the first lifting mechanism away from the first movable base. The shearing robot is used to perform shearing operations on the water supply pipe at the shearing point.

6. The method for dismantling the heavy water reactor feedwater pipe according to claim 5, characterized in that, The clamping tool in step 3 includes a second movable base, a second lifting mechanism, and a clamping component; The second lifting mechanism is mounted on the second movable base, and the clamping member is mounted on the end of the second lifting mechanism away from the second movable base. The clamping member is used to clamp the broken pipe cut by the shearing robot.

7. The method for dismantling the heavy water reactor feedwater pipe according to claim 6, characterized in that, Both the first lifting mechanism and the second lifting mechanism include a driving component and a scissor structure connected to the driving component. The driving component is mounted on the first movable base or the second movable base and is used to drive the scissor structure to extend and retract to adjust the working height of the shearing robot or the clamping component.

8. The method for dismantling the heavy water reactor feedwater pipe according to claim 6, characterized in that, The clamping tool further includes a shielding box, which is installed on one end of the second lifting mechanism away from the second movable base, and the clamping component is installed on the shielding box; The shielding box forms a sealed operating space.

9. The method for dismantling the heavy water reactor feedwater pipe according to claim 1, characterized in that, In step 3, the working status of the cutting tool and the clamping tool is controlled by a remote control terminal.

10. A heavy water reactor feedwater pipe dismantling device, characterized in that, The method for removing the heavy water reactor feedwater pipe as described in any one of claims 1-9, wherein the removal device comprises: The device includes a cutting tool, a clamping tool, and a collection box. The cutting tool is used to cut the water supply pipe at the cutting point. The clamping tool is used to hold the cut pipe. The collection box is used to collect and transport the cut pipe.

11. The heavy water reactor feedwater pipe removal device according to claim 10, characterized in that, It also includes a slide rail, and the cutting tool, the clamping tool and the collection box are respectively slidably engaged with the slide rail; The length extension direction of the slide rail is consistent with the arrangement direction of the fuel channel.

12. The heavy water reactor feedwater pipe removal device according to claim 10, characterized in that, The clamping tool is equipped with a shielding box, which has a sealed operating space to accommodate the operator.

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