Heat transfer expansion plate processing and withdrawal system

Abstract

The present invention relates to a heat transfer expansion plate processing and extraction system, and more specifically, by removing and extracting a heat transfer expansion plate installed inside the piping of the Reactor Coolant System (RCS) on the primary side of a nuclear power plant, the heat transfer expansion plate can be removed by remotely operating an electrical discharge machining (EDM) device and a gripper device installed on the equipment after installing equipment inside the reactor; by processing the heat transfer expansion plate remotely in a high-radiation zone, radiation exposure to workers can be reduced; by precisely processing the heat transfer expansion plate using an EDM device, damage inside the reactor can be prevented; by processing cutting grooves and cutting holes using an EDM device, processing time can be shortened and foreign materials generated during cutting can be minimized; by processing a gripper hole inside the heat transfer expansion plate and inserting a gripper, the heat transfer expansion plate can be stably grasped and pulled; and by processing the position of the gripper hole in the heat transfer expansion plate at a desired location, It has the effect of being able to adjust the gripper shape and overall size of the extraction device.

Description

Technology Field

[0001] The present invention relates to a heat transfer expansion plate installed inside the piping of the Reactor Coolant System (RCS) on the primary side of a nuclear power plant, which allows for the removal of the heat transfer expansion plate by operating an electrical discharge machining (EDM) device and a gripper device installed on the equipment remotely after installing the equipment inside the reactor; by processing the heat transfer expansion plate remotely in a high-radiation zone, radiation exposure to workers can be reduced; by precisely processing the heat transfer expansion plate using an EDM device, damage to the inside of the reactor can be prevented; by processing cutting grooves and cutting holes using an EDM device, processing time can be shortened and foreign matter generated during cutting can be minimized; by processing a gripper hole inside the heat transfer expansion plate and inserting a gripper, the heat transfer expansion plate can be stably grasped and pulled; and by processing the position of the gripper hole in the heat transfer expansion plate at a desired location, the shape of the gripper and the overall size of the extraction device can be adjusted. This is a technology regarding the withdrawal system. Background Technology

[0002] Damage to the heat transfer expansion plate installed inside the piping of the reactor coolant system (RCS) on the primary side of a nuclear power plant in operation requires its removal, but it is difficult for workers to access the high-radiation zone and there is a risk of radiation exposure during the work, and it is also difficult to install and operate the equipment due to the narrow and enclosed space.

[0003] In addition, conventionally, a rotary shear blade was used to make scratches or cut the inside of the heat transfer expansion plate.

[0004] In this case, excessive cutting time is required, and secondary waste is generated due to cutting chips and cutting fluid produced during cutting, and if foreign matter is not collected properly, damage to other equipment may occur due to foreign matter during operation.

[0005] In addition, due to the difficulty of operation, there is a risk of damage to the pipe base material caused by the cutting blade.

[0006] Therefore, there is an urgent need to develop a heat transfer expansion plate processing and extraction system that is installed inside the reactor and operated remotely, allowing for the removal of the heat transfer expansion plate without damaging the reactor interior; that utilizes electrical discharge machining to vertically split and cut the heat transfer expansion plate or machine a vertical groove for cutting; and machines a gripper hole using electrical discharge machining to extract the heat transfer expansion plate, after which the plate can be extracted using the gripper. Prior art literature

[0007] KR 10-2023-0143617(2023.10.29) The problem to be solved

[0008] Accordingly, the present invention was conceived to solve the above-mentioned problems, and aims to provide a heat transfer expansion plate processing and extraction system that allows the heat transfer expansion plate to be removed by operating the electrical discharge machining device and Gripper equipment installed on the equipment remotely after installing the equipment inside the reactor, by removing and extracting the heat transfer expansion plate installed inside the piping of the reactor coolant system (RCS) on the primary side of the reactor in a nuclear power plant.

[0009] Another objective of the present invention is to provide a heat transfer expansion plate processing and withdrawal system capable of reducing radiation exposure to workers by processing the heat transfer expansion plate remotely in a high-radiation zone.

[0010] Another objective of the present invention is to provide a heat transfer expansion plate processing and extraction system capable of preventing damage inside the reactor by precisely processing the heat transfer expansion plate through electrical discharge processing using an electrical discharge processing device.

[0011] Another objective of the present invention is to provide a heat transfer expansion plate processing and extraction system that can reduce processing time and minimize foreign substances generated during cutting by processing cutting grooves and cutting holes through electrical discharge machining using an electrical discharge machining device.

[0012] Another objective of the present invention is to provide a heat transfer expansion plate processing and extraction system capable of stably gripping and pulling a heat transfer expansion plate by processing a gripper hole inside the heat transfer expansion plate and inserting a gripper.

[0013] Another objective of the present invention is to provide a heat transfer expansion plate processing and extraction system capable of adjusting the gripper shape and overall size of the extraction device by processing the position of the gripper hole of the heat transfer expansion plate at a desired location. means of solving the problem

[0014] A heat transfer expansion plate processing and withdrawal system according to a preferred embodiment of the present invention for achieving the above objective comprises: a moving system for moving a withdrawal device into the reactor piping; an electrical discharge processing device installed on a multi-axis robot, to which a discharge liquid recovery plate is attached for recovering the discharge liquid supplied for electrical discharge processing and discharge, and which processes the heat transfer expansion plate while spraying the discharge liquid and discharging the heat transfer expansion plate and the electrical discharge processing blade; and a withdrawal device equipped with a gripper to withdraw the processed heat transfer expansion plate.

[0015] The present invention is characterized in that the electrical discharge processing device is inserted inside a heat transfer expansion plate, the electrical discharge processing blade is positioned vertically close to the heat transfer expansion plate, and the electrical discharge processing blade is manufactured to have a similar internal curved shape and length to the heat transfer expansion plate so that the entire thing can make contact at once.

[0016] The present invention is characterized by the fact that the heat transfer expansion plate is processed automatically while adjusting the processing depth in the electrical discharge machining device, and when processing is completed to a set depth, the device rotates to repeat the same operation, and the number of processing operations is two or more.

[0017] The present invention is characterized in that the discharge fluid generated during processing is collected in a discharge fluid recovery plate installed at the bottom of the discharge processing device, passes through a filter, and is then re-sprayed.

[0018] The present invention is characterized by including mounting an electrical discharge machining head for processing a gripper hole on the electrical discharge machining device, positioning the electrical discharge machining device on a heat transfer expansion plate, inserting the electrical discharge machining head for processing a gripper hole into the heat transfer expansion plate, and processing a gripper hole in the heat transfer expansion plate through electrical discharge machining.

[0019] In the present invention, the gripper holes are characterized by being processed into about 2 to 4 holes while rotating.

[0020] The present invention is characterized by including moving the gripper of the extraction device to the position of the heat transfer expansion plate gripper hole, expanding the gripper so that the gripper is inserted between the heat transfer holes, and, once the gripper is inserted into the heat transfer expansion plate, lowering the hydraulic cylinder of the extraction device to move the gripper downward so that the heat transfer expansion plate descends, thereby removing the heat transfer expansion plate from the piping. Effects of the invention

[0021] As described above, the heat transfer expansion plate processing and extraction system of the present invention has the following effects.

[0022] First, the present invention allows for the removal of a heat transfer expansion plate installed inside the piping of the reactor coolant system (RCS) on the primary side of a nuclear power plant by removing and withdrawing the heat transfer expansion plate, thereby enabling the removal of the heat transfer expansion plate by operating the electrical discharge machining device and Gripper equipment installed on the equipment remotely after installing the equipment inside the reactor.

[0023] Second, the present invention can reduce radiation exposure to workers by processing a heat transfer expansion plate remotely in a high-radiation zone.

[0024] Third, the present invention can prevent damage to the inside of the reactor by precisely machining the heat transfer expansion plate through electrical discharge machining using an electrical discharge machining device.

[0025] Fourth, the present invention can reduce processing time and minimize foreign substances generated during cutting by processing cutting grooves and cutting holes through electrical discharge machining using an electrical discharge machining device.

[0026] Fifth, the present invention allows the heat transfer expansion plate to be stably gripped and pulled by machining a gripper hole inside the heat transfer expansion plate and inserting a gripper.

[0027] Sixth, the present invention allows the shape of the gripper and the overall size of the extraction device to be adjusted by machining the position of the gripper hole of the heat transfer expansion plate at a desired location. Brief explanation of the drawing

[0028] FIG. 1 is a drawing illustrating the configuration of a heat transfer expansion plate processing and withdrawal system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the combined relationship of a heat transfer expansion plate, an electrical discharge machining device, an electrical discharge machining head for processing gripper holes, and an electrical discharge fluid recovery plate among the components of a heat transfer expansion plate processing and withdrawal system according to an embodiment of the present invention. Specific details for implementing the invention

[0029] Preferred embodiments of the present invention are described below in conjunction with the attached drawings. In describing the present invention, if it is determined that a detailed description of related known technologies or configurations may unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention; since these may vary depending on the intentions or conventions of the user or operator, their definitions should be based on the content throughout this specification describing the heat transfer expansion plate processing and extraction system of the present invention.

[0030] Hereinafter, a heat transfer expansion plate processing and extraction system according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0031] FIG. 1 is a drawing illustrating the configuration of a heat transfer expansion plate processing and withdrawal system according to an embodiment of the present invention, and FIG. 2 is a drawing illustrating the combined relationship of a heat transfer expansion plate, an electrical discharge machining device, an electrical discharge machining head for processing gripper holes, and an electrical discharge fluid recovery plate among the configurations of a heat transfer expansion plate processing and withdrawal system according to an embodiment of the present invention.

[0032] As illustrated in FIGS. 1 and 2, the heat transfer expansion plate processing and extraction system of the present invention is composed of a moving system (10), a multi-axis robot (20), an electrical discharge processing device (30), an electrical discharge fluid recovery plate (31), a heat transfer expansion plate (32), an electrical discharge processing head (33) for processing a gripper hole, an extraction device (40), a gripper (41), a reactor pipe (50), a processing groove (60), a reactor vessel (70), etc.

[0033] As illustrated in FIGS. 1 and 2, the heat transfer expansion plate processing and extraction system comprises: a moving system (10) that moves an extraction device (40) into the reactor piping (50); an electrical discharge processing device (30) that is installed on a multi-axis robot (20) and has an electrical discharge recovery plate (31) attached to recover the electrical discharge liquid supplied for electrical discharge processing and discharge, and processes the heat transfer expansion plate (32) while spraying the electrical discharge liquid and discharging the electrical discharge processing blade; and an extraction device (40) that has a gripper (41) installed to extract the processed heat transfer expansion plate (32).

[0034] The configuration and function of the technical means constituting the heat transfer expansion plate processing and extraction system of the present invention are as follows.

[0035] The above-mentioned moving system (10) moves the extraction device (40) into the reactor pipe (50).

[0036] The above electrical discharge machining device (30) is installed on a multi-axis robot (20) and is equipped with an electrical discharge liquid recovery plate (31) for recovering the electrical discharge liquid supplied for electrical discharge machining and discharge, and processes the heat transfer expansion plate (32) while spraying the electrical discharge liquid and discharging the electrical discharge machining blade.

[0037] Here, the electrical discharge machining device (30) is inserted into the heat transfer expansion plate (32), and an electrical discharge machining blade (not shown) is positioned vertically close to the heat transfer expansion plate (32). The electrical discharge machining blade is manufactured to have a similar internal curved shape and length to the heat transfer expansion plate (32) so that the entire thing can be in contact at once.

[0038] In addition, the heat transfer expansion plate (32) is processed while automatically adjusting the processing depth in the above electrical discharge machining device (30), and when processing is completed to the set depth, it rotates to repeat the same operation, and the number of processing operations is two or more.

[0039] And, the discharge liquid generated during the above processing is collected in the discharge liquid recovery plate (31) installed at the bottom of the discharge processing device (30), then passes through a filter and is re-sprayed.

[0040] In addition, the electrical discharge machining head (33) for machining the gripper hole is mounted on the electrical discharge machining device (30), the electrical discharge machining device (30) is positioned on the heat transfer expansion plate (32), and the electrical discharge machining head (33) for machining the gripper hole is inserted into the heat transfer expansion plate (32), and the gripper (41) hole is machined through electrical discharge machining on the heat transfer expansion plate (32).

[0041] The holes of the gripper (41) are processed into about 2 to 4 holes while rotating.

[0042] The above extraction device (40) is equipped with a gripper (41) to extract the processed heat transfer expansion plate (32).

[0043] Here, the gripper (41) of the extraction device (40) is moved to the position of the gripper (41) hole of the heat transfer expansion plate (32), and the gripper (41) is expanded so that the gripper (41) is inserted between the heat transfer holes. When the gripper (41) is inserted into the heat transfer expansion plate (32), the hydraulic cylinder of the extraction device (40) is lowered to move the gripper (41) downward, causing the heat transfer expansion plate (32) to descend, thereby removing the heat transfer expansion plate (32) from the reactor piping (50).

[0044] The inspection and maintenance operations of the remote system for reactor piping maintenance according to the present invention are described in more detail as follows.

[0045] First, a moving system (10) equipped with a heat transfer expansion plate processing device is installed inside the reactor.

[0046] Afterwards, the discharge processing device (30) is moved into the reactor piping (50) and positioned at the center of the heat transfer expansion plate (32).

[0047] The above electrical discharge machining device (30) is inserted into the heat transfer expansion plate (32), and an electrical discharge machining blade (not shown) is brought vertically close to the heat transfer expansion plate (32).

[0048] Afterwards, the electrical discharge machining blade is manufactured to have a similar internal curved shape and length to the heat transfer expansion plate (32) so that the entire thing can be in contact at once.

[0049] Next, the heat transfer expansion plate (32) is processed while spraying the discharge liquid and discharging the heat transfer expansion plate (32) and the discharge processing blade.

[0050] Afterwards, the heat transfer expansion plate (32) is processed while automatically adjusting the processing depth, and when processing is completed to the set depth, it is rotated to repeat the same operation. The processing is performed at least twice to create multiple vertical processing grooves (60).

[0051] In addition, the discharge liquid generated during processing is collected in a discharge liquid recovery plate (31) installed at the bottom of the discharge processing device (30), then passes through a filter and is re-sprayed.

[0052] Once the above processing is completed, the electrical discharge processing device (30) is moved to its initial position, and then the moving system (10) is moved out of the reactor vessel (70).

[0053] Afterwards, the electrical discharge machining head (33) for machining the gripper hole is mounted on the electrical discharge machining device (30), and then the electrical discharge machining device (30) is positioned again on the heat transfer expansion plate (32).

[0054] After inserting the above-mentioned electrical discharge machining head (33) for machining the gripper hole into the heat transfer expansion plate (32), the gripper (41) hole is machined in the heat transfer expansion plate (32) through electrical discharge machining.

[0055] The above gripper holes are machined into about 2 to 4 holes while rotating.

[0056] Next, when the above processing is completed, the electrical discharge processing device (30) is moved to its original position, and then the moving system (10) is moved out of the reactor vessel (70).

[0057] Afterwards, the discharge machining device (30) is removed from the moving system (10), and the extraction device (40) is installed.

[0058] After installing the above-mentioned moving system (10) back inside the reactor, the extraction device (40) is moved to the position of the heat transfer expansion plate (32).

[0059] After moving the gripper (41) of the above extraction device (40) to the gripper hole position of the heat transfer expansion plate (32), the gripper (41) is expanded so that the gripper (41) is inserted between the heat transfer holes.

[0060] Additionally, when the gripper (41) is inserted into the heat transfer expansion plate (32), the hydraulic cylinder of the extraction device (40) is lowered to move the gripper (41) downward, causing the heat transfer expansion plate (32) to descend, thereby removing the heat transfer expansion plate (32) from the reactor piping (50).

[0061] As described above, the heat transfer expansion plate processing and extraction system of the present invention can be applied to the field of removing and extracting heat transfer expansion plates installed inside the reactor coolant system (RCS) piping on the primary side of the reactor in a nuclear power plant. Explanation of the symbols

[0062] 10 : Mobility System 20 : Multi-axis Robot 30: Electrical Discharge Machining device 31: Discharge fluid recovery plate 32 : Heat transfer expansion plate 33: EDM head for Gripper hole machining 40 : Pull-out device 41 : Gripper 50 : Reactor Piping 60 : Machining Groove 70: Reactor vessel

Claims

Claim 1 A system for processing and extracting a heat transfer expansion plate (32) of a reactor coolant system (RCS), comprising: a moving system (10) installed to be movable to a target position inside the reactor; a multi-axis robot (20) mounted on the moving system (10) and precisely controlled; an electrical discharge machining device (30) operated by the multi-axis robot (20) to process a hole for gripper attachment in the heat transfer expansion plate (32); and a gripper (40) that is attached to the hole processed by the electrical discharge machining device (30) to extract the heat transfer expansion plate (32), wherein the electrical discharge machining device (30) comprises an electrical discharge machining head (33) installed facing the surface of the heat transfer expansion plate (32). A heat transfer expansion plate processing and extraction system comprising a discharge fluid recovery plate (31) located below the above-mentioned discharge processing head (33) to collect the discharge fluid generated during discharge processing, and the multi-axis robot (20) guiding the above-mentioned discharge processing head (33) and the above-mentioned gripper (40) to the working position of the heat transfer expansion plate (32) for processing and extraction of the heat transfer expansion plate (32). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete

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