Repair methods and equipment for the tube sockets of nuclear reactor control rod drive mechanism

Abstract

This invention discloses a method and equipment for repairing the CRDM (Control Rod Drive Mechanism) socket of a nuclear reactor. The method for repairing the CRDM socket includes the following steps: using a tool to machine the worn conical surface inside the CRDM socket to form a setting surface; preparing a compensation component, which has a countersunk hole at the bottom of the compensation component and a mating surface at the bottom; placing the compensation component into the machined CRDM socket and making the mating surface abut against the setting surface, so that the compensation component and the machined CRDM socket together define a circular hole-countersunk hole combination, thereby extending the service life of the CRDM socket and thus extending the service life of the pressure vessel.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant maintenance technology, and in particular to a method and equipment for repairing the tube seat of a nuclear reactor control rod drive mechanism. Background Technology

[0002] In a reactor pressure vessel, the control rod drive machine (CRDM) is mounted on the CRDM socket of the reactor pressure vessel top cover. The CRDM socket is the main component that supports and fixes the CRDM. The end of the CRDM socket has a round hole and a conical countersunk hole communicating with the round hole to form a round hole-conical countersunk hole combination hole for mating with a heat jacket. The main function of the heat jacket is to provide a channel for the control rod drive rod. The heat jacket is set inside the CRDM socket and has a radially protruding flange that abuts against the conical surface of the conical countersunk hole.

[0003] During operation, the impact of water flow may cause the lower part of the heat jacket to swing, the entire heat jacket to move up and down and circumferentially, which will cause the conical part of the lower part of the heat jacket flange to wear against the CRDM pipe seat, thus affecting the service life of the reactor pressure vessel top cover. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for repairing the CRDM (Control Rod Drive Mechanism) tube seat, which can be used to repair the CRDM tube seat to extend the life of the pressure vessel top cover.

[0005] The present invention also proposes a nuclear reactor control rod drive mechanism tube socket repair device for a method of repairing nuclear reactor control rod drive mechanism tube sockets.

[0006] A method for repairing a nuclear reactor control rod drive mechanism socket according to a first aspect of the present invention is used to repair a CRDM socket, the method comprising the following steps:

[0007] The worn conical surface inside the CRDM tube socket is machined using a tool to form a setting surface;

[0008] Prepare a compensation component, which has a conical countersunk hole and a mating surface at the bottom. Place the compensation component into the machined CRDM pipe seat and make the mating surface abut against the set surface so that the compensation component and the machined CRDM pipe seat together define a round hole-conical countersunk hole combination.

[0009] According to embodiments of the present invention, at least the following beneficial effects are achieved:

[0010] In this embodiment, a tool is used to machine the worn conical surface inside the CRDM pipe seat to form a setting surface. The compensation component is then placed into the machined CRDM pipe seat, and the mating surface abuts against the setting surface. This allows the compensation component and the machined CRDM pipe seat to jointly define a round hole-cone bottom countersunk combination hole, thereby extending the service life of the CRDM pipe seat and thus extending the service life of the pressure vessel.

[0011] According to a second aspect of the present invention, a nuclear reactor control rod drive mechanism tube seat repair device is used to complete the processing of the set surface in the nuclear reactor control rod drive mechanism tube seat repair method. The nuclear reactor control rod drive mechanism tube seat repair device includes: a repair device, a locking device, a hanger, and a controller.

[0012] The repair device includes a drive system and a cutting tool. The drive system is connected to the cutting tool and drives the cutting tool to move, thereby machining the worn conical surface inside the CRDM tube socket to form a set surface. A locking device is connected to the repair device and includes a locking element for locking the CRDM tube socket, thereby fixing the repair device to the CRDM tube socket. A lifting frame is connected to the repair device or the locking device for connecting to lifting equipment to lift the nuclear reactor CRDM tube socket repair device onto the CRDM tube socket. A controller is communicatively connected to the drive system and is configured to: activate the locking device to lock the CRDM tube socket and activate the drive system to drive the cutting tool to move.

[0013] The nuclear reactor control rod drive mechanism tube seat repair device according to an embodiment of the present invention has at least the following beneficial effects:

[0014] The nuclear reactor CRDM tube socket repair equipment in this embodiment includes a hoist for lifting equipment to hoist the CRDM tube socket repair device onto the CRDM tube socket of the pressure vessel to complete the machining of the set surface in the first aspect embodiment. The set surface is used to cooperate with the placed compensation component so that the compensation component and the machined CRDM tube socket together define a round hole-cone bottom countersunk head combination hole, thereby extending the service life of the CRDM tube socket and thus extending the service life of the pressure vessel top cover. In addition, the nuclear reactor CRDM tube socket repair equipment is hoisted onto the CRDM tube socket by the hoist, and the drive system is activated by the controller to drive the tool movement to machine the CRDM tube socket without removing the CRDM tube socket from the pressure vessel. This eliminates the need for manual work in a radiation environment for extended periods, thereby improving operational safety.

[0015] According to some embodiments of the present invention, the drive system includes a rotary mechanism and a radial drive mechanism. The radial drive mechanism is connected to the cutting tool and is used to drive the cutting tool to move horizontally. The rotary mechanism is connected to the radial drive mechanism and is used to drive the radial drive mechanism to move circumferentially around a set axis, the set axis being parallel to the vertical direction.

[0016] According to some embodiments of the present invention, the cutting tool includes a tool holder and a plurality of blades, the plurality of blades being axially connected to the tool holder about the tool holder. The driving system further includes a rotating mechanism for driving the tool holder to rotate about its own axis. A radial driving mechanism is connected to the rotating mechanism for driving the rotating mechanism to move horizontally, thereby causing the cutting tool to move horizontally.

[0017] According to some embodiments of the present invention, the drive system further includes an axial drive mechanism connected to the cutting tool for driving the cutting tool to move in the vertical direction; a radial drive mechanism connected to the axial drive mechanism for driving the axial drive mechanism to move horizontally, thereby causing the cutting tool to move horizontally; and an axial drive mechanism connected to the rotary mechanism for driving the rotary mechanism to move vertically, thereby causing the cutting tool to move vertically.

[0018] According to some embodiments of the present invention, the nuclear reactor control rod drive mechanism tube seat repair equipment further includes a size detection device, which is connected to the axial drive mechanism and is used to detect the size of the set surface.

[0019] According to some embodiments of the present invention, the setting surface includes a cylindrical surface, an annular plane, and an inclined surface, wherein the outer edge of the annular plane is connected to the lower edge of the cylindrical surface, and the inclined surface is connected to the inner edge of the annular plane;

[0020] The blade includes a first blade and a second blade. The first blade is located on the radial sidewall of the tool holder and is used to machine the cylindrical surface and the annular plane. The second blade is located at the axial end of the tool holder and is used to machine the inclined surface.

[0021] According to some embodiments of the present invention, the tool holder includes a first mounting portion and a second mounting portion, the first blade is connected to the first mounting portion, the first mounting portion has a mounting hole coaxial with the tool holder, the second blade is connected to the second mounting portion, the second mounting portion is mounted in the mounting hole, and can move and lock relative to the first mounting portion in a vertical direction to adjust the size of the second blade protruding from the mounting hole.

[0022] According to some embodiments of the present invention, the second mounting portion has a first threaded hole communicating with the mounting hole, the first threaded hole being located on the side wall of the first mounting portion, the cutting tool further includes a fastener, the fastener passing through the first threaded hole and threadedly engaging with the first mounting portion, the fastener being able to abut against the radial side of the second mounting portion.

[0023] According to some embodiments of the present invention, the inner wall of the mounting hole includes a downward-facing first mounting surface, the second mounting portion has a second mounting surface facing the first mounting surface, and the cutting tool further includes a plurality of shims of different thicknesses, each of the shims being detachably disposed between the first mounting surface and the second mounting surface to adjust the size of the second blade protruding from the mounting hole.

[0024] According to some embodiments of the present invention, both the first blade and the second blade can be detachably connected to the blade holder.

[0025] According to some embodiments of the present invention, the locking device further includes a connector and a plurality of locking members, the connector being connected to the repair device, the plurality of locking members being connected to the connector and distributed around the set axis, and each locking member being capable of horizontal movement relative to the connector to press against the outer wall of the CRDM tube seat.

[0026] According to some embodiments of the present invention, the nuclear reactor control rod drive mechanism tube seat repair device further includes a protective sleeve, which is used to fit onto the radial outer wall of the CRDM tube seat. The protective sleeve has a second threaded hole, which is used to engage with the external thread located on the radial outer wall of the CRDM tube seat. The locking member can abut against the protective sleeve to lock the CRDM tube seat.

[0027] According to some embodiments of the present invention, a flexible locking sleeve is formed by connecting multiple connectors together. The locking sleeve has a first receiving cavity for inserting the CRDM tube socket. The nuclear reactor control rod drive mechanism tube socket repair device further includes an adjusting member. The adjusting member has an annular structure and is capable of reciprocating in the vertical direction and abutting against the radial outer wall of the locking sleeve to cause the locking sleeve to retract radially.

[0028] According to some embodiments of the present invention, the direction of movement of the adjusting member when the locking member retracts radially is defined as a set direction. Along the set direction, the outer diameter of the locking member gradually increases, the inner diameter of the adjusting member gradually increases, the radial outer wall of the locking sleeve fits against the radial inner wall of the adjusting member, and the inner wall of the locking sleeve adapts to the radial outer wall of the protective sleeve. When the adjusting member moves along the set direction and squeezes the locking member, causing the locking sleeve to retract, the radial inner wall of the locking sleeve can fit against the radial outer wall of the protective sleeve.

[0029] According to some embodiments of the present invention, the top of the connector further includes a limiting portion having a downward limiting surface, the limiting surface being used to engage with the top surface of the protective sleeve to make the CRDM tube seat vertically positioned.

[0030] According to some embodiments of the present invention, the locking device further includes at least three non-collinearly arranged positioning sensors connected to the limiting portion. Each positioning sensor includes a probe, the bottom end of which is flush with the limiting surface. The positioning sensors are configured such that when the top surface of the protective sleeve is in contact with the limiting surface, the detection signals of at least three of the positioning sensors change.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 This is a schematic diagram of the structure of a CRDM pipe socket in the prior art;

[0034] Figure 2 for Figure 1 A sectional view;

[0035] Figure 3 This is a schematic diagram of the structure of the nuclear reactor control rod drive mechanism tube seat repair device according to an embodiment of the present invention;

[0036] Figure 4 for Figure 3 A sectional view;

[0037] Figure 5 For CRDM pipe socket and Figure 4 Cross-sectional view of the CNNC reactor control rod drive mechanism tube seat repair equipment;

[0038] Figure 6 This is a schematic diagram of the working conditions of the nuclear reactor control rod drive mechanism tube repair equipment during the repair of the CRDM tube in an embodiment of the present invention;

[0039] Figure 7 for Figure 4 A schematic diagram of the structure of the repair device;

[0040] Figure 8 for Figure 4 Schematic diagram of the structure of the cutting tool;

[0041] Figure 9 for Figure 8 A sectional view;

[0042] Figure 10 for Figure 9 A magnified view of area A in the middle;

[0043] Figure 11 for Figure 4 Schematic diagram of the locking device;

[0044] Figure 12 for Figure 11 A sectional view;

[0045] Figure 13 for Figure 12 Schematic diagram of the middle locking sleeve;

[0046] Figure 14 This is a schematic diagram of the structure of the nuclear reactor control rod drive mechanism tube seat repair equipment after processing of the CRDM tube seat, according to an embodiment of the present invention.

[0047] Figure label:

[0048] CRDM pipe seat 10, round hole 11, conical countersunk hole 12, external thread 13, pressure vessel top cover 20, setting surface 30, cylindrical surface 31, annular plane 32, inclined surface 33, control rod drive mechanism 40.

[0049] 1000 Nuclear reactor control rod drive mechanism pipe seat repair equipment;

[0050] Repair device 100, drive system 110, rotary mechanism 111, turntable 1111, transmission cylinder 1112, radial drive mechanism 112, rotation mechanism 113, axial drive mechanism 114, cutting tool 120, tool holder 121, first mounting part 1211, mounting hole 12111, first threaded hole 12112, first mounting surface 12113, second mounting part 1212, second mounting surface 1213, blade 122, first blade 1221, second blade 1222, fastener 123, gasket 124, protective cover 130;

[0051] Locking device 200, locking part 210, locking sleeve 201, snap-fit ​​part 211, deformation gap 212, first deformation gap 2121, second deformation gap 2122, connecting part 220, limiting part 221, limiting surface 2211, adjusting part 230.

[0052] Base 300, guide part 310;

[0053] Hanger 400, lifting ring 410, tie rod 420;

[0054] Protective case 500. Detailed Implementation

[0055] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0056] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0057] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0058] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0059] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] In a nuclear reactor pressure vessel, a control rod drive mechanism 40 (CRDM) is mounted on a CRDM tube seat 10 on the reactor pressure vessel top cover 20. The CRDM tube seat on the reactor pressure vessel top cover 20 is the main component supporting and fixing the control rod drive mechanism 40. The end of the CRDM tube seat 10 has a circular hole 11 and a conical countersunk hole 12 communicating with the circular hole (e.g., ...). Figure 1 and Figure 2 The hole is formed into a round hole-cone countersunk head combination hole for mating with a heat sleeve. The main function of the heat sleeve is to provide a channel for the control rod drive rod. The heat sleeve is set in the CRDM tube seat 10 and has a radially protruding flange that abuts against the conical surface of the cone countersunk head hole.

[0061] During operation, the impact of water flow may cause the lower part of the heat jacket to swing, the entire heat jacket to move up and down and circumferentially, which will cause the conical part of the lower part of the heat jacket flange that contacts the CRDM pipe seat 10 to wear against each other, thus affecting the service life of the pressure vessel top cover 20.

[0062] In view of the above background, the first aspect of the present invention provides a method for repairing the CRDM (Control Rod Drive Mechanism) socket of a nuclear reactor, which can be used to repair the CRDM socket to extend the life of the pressure vessel.

[0063] A method for repairing a nuclear reactor control rod drive mechanism socket according to a first aspect embodiment of the present invention is used to repair a CRDM socket. The method for repairing a nuclear reactor control rod drive mechanism socket includes the following steps:

[0064] Using tools, the worn conical surface inside the CRDM tube socket is machined to form a setting surface 30;

[0065] Prepare a compensation component with a conical countersunk hole and a mating surface at the bottom. Place the compensation component into the machined CRDM pipe seat and make the mating surface abut against the set surface 30 so that the compensation component and the machined CRDM pipe seat together define a round hole-conical countersunk hole combination.

[0066] Specifically, in this embodiment, a tool is used to machine the worn conical surface inside the CRDM tube socket to form a setting surface 30. The setting surface 30 is, for example, a conical surface, a cylindrical surface-plane combination surface, or a cylindrical surface-plane-conical surface (e.g., Figure 13 As shown, the combination surface, etc., can be matched with the mating surface of the compensation component so that the compensation component and the processed CRDM pipe seat together define a round hole-cone bottom countersunk head combination hole, so as to extend the service life of the CRDM pipe seat, thereby extending the service life of the pressure vessel top cover 20.

[0067] The CRDM tube socket repair apparatus 1000 of the second aspect of the present invention (for the sake of brevity, unless otherwise specified, the nuclear reactor control rod drive mechanism tube socket repair apparatus 1000 will be referred to as repair apparatus 1000) is used to complete the processing of the set surface 30 in the CRDM tube socket 10 repair method, referring to... Figures 3 to 6 The repair device 1000 in this embodiment includes: a repair device 100, a locking device 200, a base 300, a hanger 400, and a controller.

[0068] The repair device 100 includes a drive system 110 and a cutting tool 120. The drive system 110 is connected to the cutting tool 120 and drives the cutting tool 120 to move, thereby machining the worn conical surface inside the CRDM tube seat 10 to form a setting surface 30. Exemplarily, the drive system 110 includes an axial drive mechanism 114 and a rotation mechanism 113. The axial drive mechanism 114 includes a first power component and a first mounting component. The first power component is, for example, a motor, a cylinder, or a hydraulic cylinder. The first power component is connected to the first mounting component and drives the first mounting component to move up and down. The rotation mechanism 113 includes a second power component, for example, a motor. The second power component is connected to the cutting tool 120 and drives the cutting tool 120 to rotate. Thus, during the machining process, the axial drive mechanism 114 drives the rotation mechanism 113 downwards, causing the cutting tool 120 to move downwards and contact the worn part inside the CRDM tube seat 10 for machining.

[0069] The locking device 200 is connected to the repair device 100. The locking device 200 includes a locking member 210 for locking the CRDM tube seat 10, thereby securing the repair device 100 to the CRDM tube seat 10. Exemplarily, since the pressure vessel top cover 20 typically has multiple CRDM tube seats 10 for mounting multiple control rod drive mechanisms 40 (such as…),… Figure 6As shown in the figure, for example, each CPR1000 reactor unit has 61 CRDM sets above the pressure vessel top cover 20, and correspondingly requires 61 CRDM tube seats 10. Therefore, under the premise of ensuring safety requirements, the wall thickness of the CRDM tube seat 10 will not be too large, that is, the top surface space of the CRDM tube seat 10 is small. It is difficult to guarantee the stability of the repair device 100 by directly placing it on the top surface of the CRDM tube seat 10. Based on this, in order to improve the stability of the tool 120 during processing, in some embodiments, the locking device 200 also includes a connector 220 and a locking member 210. Multiple locking members 210 are distributed around an axis extending vertically. All locking members 210 are movably connected to the connector 220 and can move horizontally relative to the connector 220 to abut against the CRDM tube seat 10. Preferably, in some embodiments, the connector 220 is configured to be processed outside the CRDM tube seat 10 to abut against the outer wall of the CRDM tube seat 10, thereby avoiding interference between the locking device 200 and the tool 120, allowing the tool 120 to have a larger tool path space, which is beneficial for the repair of the CRDM tube seat 10.

[0070] The hanger 400 is connected to the repair device 100 or the locking device 200 for connecting to lifting equipment to hoist the repair device 1000 onto the CRDM pipe fitting 10. Figure 4 As shown in the example, the hanger 400 includes a lifting ring 410 and a pull rod 420. The lifting ring 410 is connected to the top of the pull rod 420, and the pull rod 420 is connected to the repair device 100, specifically the rotating mechanism 113 in the following embodiment. The controller is communicatively connected to the drive system 110 and is configured to: activate the locking device 200 to lock the CRDM tube seat 10, and activate the drive system 110 to drive the tool 120 to move.

[0071] Specifically, in this embodiment, the repair equipment 1000 includes a hanger 400 for lifting equipment to hoist the repair equipment 1000 onto the CRDM tube seat 10 of the pressure vessel top cover 20 to complete the machining of the setting surface 30 in the first aspect embodiment. The setting surface 30 is used to cooperate with the placed compensation component so that the compensation component and the machined CRDM tube seat 10 together define a round hole-cone bottom countersunk hole combination hole, thereby extending the service life of the CRDM tube seat 10 and thus extending the service life of the pressure vessel top cover 20. In addition, the repair equipment 1000 is hoisted onto the CRDM tube seat 10 by the hanger 400, and the drive system 110 is activated by the controller to drive the tool 120 to machine the CRDM tube seat 10 without removing the CRDM tube seat 10 from the pressure vessel top cover 20. This eliminates the need for manual labor to work in a radiation environment for extended periods, thereby improving operational safety.

[0072] like Figure 3As shown, based on the above embodiment, the repair device 1000 includes a base 300, a locking device 200 connected to the top of the base 300, and a repair device 100 connected to the top of the locking device 200. That is, the base 300, the locking device 200, and the repair device 100 are distributed in the vertical direction, making full use of the height space and reducing the horizontal dimension of the repair device 1000 in this embodiment. This makes the repair device 1000 in this embodiment more suitable for operation in narrow spaces (in the prior art, in order to ensure the compactness of the pressure vessel top cover 20 structure, the gap between each CRDM pipe seat 10 is small).

[0073] Furthermore, in some embodiments, the bottom of the base 300 also includes a guide portion 310, which has a guide hole 311. The diameter of the guide hole gradually increases in the vertically downward direction, thereby facilitating the insertion of the CRDM tube socket into the repair device 1000 of this embodiment, making the repair device 1000 of this embodiment more convenient to use.

[0074] In some embodiments, the repair device 100 further includes a protective cover 130, in which the drive system 110 is located. The protective cover 130 not only protects the drive system 110 from dust but also reduces the radiation received by the drive system 110, thereby extending the service life of the drive system 110 and thus extending the service life of the repair device 1000 of this embodiment.

[0075] Reference Figure 7 , Figure 7 for Figure 4 The schematic diagram of the repair device shows the internal drive system of the device. Figure 7The protective cover is not shown. In some embodiments, the drive system 110 includes a rotary mechanism 111 and a radial drive mechanism 112. The rotary mechanism 111 is connected to the radial drive mechanism 112 and is used to drive the radial drive mechanism 112 to perform circumferential motion around a set axis, which is parallel to the vertical direction. Exemplarily, the rotary mechanism 111 includes a turntable 1111 and a second power component, such as a motor. The second power component is connected to the turntable 1111 via a transmission mechanism such as a belt or gears and is used to drive the turntable 1111 to rotate. The radial drive mechanism 112 includes a fourth power component connected to a turntable 1111. The turntable 1111 can drive the fourth power component to rotate. The fourth power component is, for example, a motor, a cylinder, or a hydraulic cylinder. The fourth power component is directly or indirectly connected to the tool 120. As in the above embodiment, the drive system 110 includes an axial drive mechanism 114. The fourth power component is connected to the axial drive mechanism 114 and is used to drive the axial drive mechanism 114 to move horizontally, thereby driving the tool 120 to move horizontally. The radial drive mechanism 112 is connected to the tool 120. Therefore, during the machining process, the radial drive mechanism 112 can drive the tool 120 to move radially, thereby adjusting the machining radius of the tool 120. This allows for the machining of cylindrical surfaces of various diameters as the setting surface 30, improving the practicality of the CRDM repair equipment in this embodiment. In addition, a small tool 120 can be used to machine the large round hole 11, thereby reducing the weight of the tool 120 and improving the stability of the tool 120 during machining and movement. At the same time, since the tool 120 is smaller, the risk of the tool 120 hitting the CRDM tube seat 10 can be reduced when it is inserted into the CRDM tube seat 10.

[0076] Reference Figure 5 Based on the above embodiments, the rotary mechanism 111 includes a second power component, a transmission assembly, and a transmission cylinder 1112. The second power component is connected to the transmission cylinder 1112 via the transmission assembly. The turntable 1111 is connected above the transmission cylinder 1112. The transmission cylinder 1112 has a second receiving cavity. The locking device 200 is located in the second receiving cavity. That is, the locking device 200 and the transmission cylinder 1112 partially overlap in the horizontal space occupied by the transmission cylinder 1112, without requiring additional space, thereby reducing the horizontal dimension of the repair device 1000 in this embodiment, which is more conducive to repairing the CRDM tube seat 10 in a narrow space.

[0077] Furthermore, the second power component is a motor, and the transmission assembly includes a first transmission wheel, a belt, a second transmission wheel, a connecting rod, and a third transmission wheel. The second power component is connected to the base 300 and is vertically arranged. The first transmission wheel is located below the second power component and connected to it. The second transmission wheel is rotatably connected to the base 300 and is located below the transmission cylinder 1112. The second transmission wheel is located within the vertical projection range of the transmission cylinder 1112, and the belt connects the first rotating wheel and the second transmission wheel. The connecting rod is vertically arranged, with one end connected to the second transmission wheel and the other end connected to the third transmission wheel. The inner wall of the transmission cylinder 1112 has circumferentially arranged internal teeth, and the second transmission wheel meshes with the internal teeth, thereby driving the transmission cylinder 1112 to rotate through the second power component, thereby driving the turntable 1111 to rotate. It can be seen that in this embodiment, the connecting rod and the third transmission wheel are located inside the second receiving cavity, that is, the space occupied by the transmission assembly and the transmission cylinder 1112 in the horizontal direction overlaps, further reducing the horizontal dimension of the repair device 1000 in this embodiment, thus making it more conducive to operation in narrow spaces.

[0078] Reference Figure 8 Based on the above embodiments, the cutting tool 120 includes a tool holder 121 and multiple cutting blades 122. The multiple cutting blades 122 are axially connected to the tool holder 121. The drive system 110 also includes a rotating mechanism 113, which drives the tool holder 121 to rotate around its own axis. A radial drive mechanism 112 is connected to the rotating mechanism 113 and drives the rotating mechanism 113 to move horizontally, thereby driving the cutting tool 120 to move horizontally. Specifically, during the machining process, the cutting tool 120 not only revolves around a set axis but also rotates around its own axis. This makes the force on the cutting tool 120 in all directions nearly uniform, thereby avoiding deformation or damage to the cutting tool 120 due to prolonged single force, thus extending the service life of the cutting tool 120. In addition, the multiple cutting blades 122 alternately process the CRDM tube seat 10, which can reduce the wear of each cutting tool 120 and further extend the service life of the cutting tool 120.

[0079] Reference Figure 7In some embodiments, the drive system 110 further includes an axial drive mechanism 114 connected to the cutter 120 for driving the cutter 120 to move vertically. A radial drive mechanism 112 connected to the axial drive mechanism 114 is used to drive the axial drive mechanism 114 to move horizontally, thereby causing the cutter 120 to move horizontally. The axial drive mechanism 114 is connected to a rotating mechanism 113 for driving the rotating mechanism 113 to move vertically, thereby causing the cutter 120 to move vertically. Specifically, since the axial drive mechanism 114 can drive the cutter 120 to move vertically, when the CRDM tube seat 10 repair equipment of this embodiment is hoisted to the CRDM tube seat 10, the cutter 120 can be raised to its highest position, thereby avoiding collision with the cutter 120 when it is locked and fixed with the CRDM tube seat 10, thus preventing the CRDM tube seat 10 from being damaged and improving the safety of the pressure vessel top cover 20 during operation.

[0080] Reference Figure 5 In some embodiments, the repair device 1000 further includes a dimension detection device 600, which is connected to the axial drive mechanism 114. The dimension detection device 600, for example, is a ruby ​​probe. After machining, it measures the vertical and horizontal travel of the cutting tool 120 during machining to determine the dimensions of the machined limiting surface 2211, thereby improving the machining accuracy of the setting surface 30. For example, during machining, a circular repair hole is formed at the CRDM wear area to mate with a compensation component; that is, the setting surface 30 is the sidewall and bottom wall of the circular repair hole (unless otherwise specified, the same applies below). After machining, the detection device 600 is moved downwards from the initial machining height by the drive system 110. When the dimension detection device 600 contacts the bottom wall, the dimension detection device 600 measures the distance as the depth of the circular repair hole. The dimension detection device 600 is driven horizontally by the drive system 110. When the dimension detection device 600 contacts the sidewall, it becomes the first mark point. The device 600 is then moved in the opposite direction, and when it contacts the sidewall again, it becomes the second mark point. The distance between the two mark points is the diameter of the circular repair hole. In addition, to improve the detection accuracy, each dimension can be measured multiple times, and the average value can be calculated.

[0081] Reference Figure 8 and Figure 14In some embodiments, the set surface 30 includes a cylindrical surface 31 (the cylindrical surface 31 is not limited to having the same diameter as the circular hole 11 at the end of the CRDM tube seat 10), an annular plane 32, and a chamfer 33. The outer edge of the annular plane 32 is connected to the lower edge of the cylindrical surface 31, and the chamfer 33 is connected to the inner edge of the annular plane 32. That is, both a circular repair hole and a chamfer are to be formed. Based on this, the blade 122 includes a first blade 1221 and a second blade 1222. The first blade 1221 is located on the radial sidewall of the tool holder 121 and is used to form the cylindrical surface 31 and the annular plane 32. The second blade 1222 is located at the axial end of the tool holder 121 and is used to form the chamfer 33. Therefore, during the processing, a circular repair hole and a chamfer can be formed simultaneously without the need for step processing, thereby improving the processing efficiency of the repair device 1000 in this embodiment, shortening the working time of the device in the radiation environment, and extending the life of the device.

[0082] Based on the above embodiments, both the first blade 1221 and the second blade 1222 are detachably connected to the tool holder 121. Specifically, the first blade 1221 and the second blade 1222 process different parts and have different shapes, so their wear levels also differ. Since both the first blade 1221 and the second blade 1222 are detachably connected to the tool holder 121 in this embodiment, when the first blade 1221 wears out, it can be replaced individually. Similarly, when the second blade 1222 wears out, it can be replaced individually, without replacing the entire tool 120, thereby saving repair costs.

[0083] Reference Figure 8 and Figure 9In some embodiments, the tool holder 121 includes a first mounting portion 1211 and a second mounting portion 1212. A first blade 1221 is connected to the first mounting portion 1211. The first mounting portion 1211 has a mounting hole 12111 coaxial with the tool holder 121. A second blade 1222 is connected to the second mounting portion 1212. The second mounting portion 1212 is detachably disposed in the mounting hole 12111 and can move and lock relative to the first mounting portion 1211 in a vertical direction to adjust the size of the second blade 1222 protruding from the mounting hole 12111. For example, in some embodiments, the second mounting portion 1212 has a first threaded hole 12112 communicating with the mounting hole 12111. The first threaded hole 12112 is located on the side wall of the first mounting portion 1211. The tool 120 also includes a fastener 123, which passes through the first threaded hole 12112 and is threadedly engaged with the first mounting portion 1211. The fastener 123 can abut against the radial side of the second mounting portion 1212, thereby locking the second mounting portion 1212 and simplifying the locking structure of the tool 120. Specifically, it can be understood that the second blade 1222 is used for chamfering, and its cutting edge is necessarily inclined to the axial direction of the tool 120 itself. Therefore, by vertically moving the second mounting portion 1212, the size of the cutting edge of the second blade 1222 protruding from the mounting hole 12111 can be adjusted, thereby adjusting the horizontal contact position between the second blade 1222 and the CRDM tube seat 10, and thus adjusting the size of the chamfered surface 33. Therefore, the repair device 1000 of this embodiment can process inclined surfaces 33 of different sizes by the relative movement of the first mounting part 1211 and the second mounting part 1212, thereby improving the practicality of the repair device 1000 of this embodiment.

[0084] Reference Figure 9 and Figure 10 In some embodiments, the inner wall of the mounting hole 12111 has a downward-facing first mounting surface 12113, and the second mounting portion 1212 has a second mounting surface 1213 facing the first mounting surface 12113. The tool 120 also includes a plurality of shims 124 of different thicknesses, each shim 124 being detachably disposed between the first mounting surface 12113 and the second mounting surface 1213 to adjust the size of the second blade 1222 protruding from the mounting hole 12111. Therefore, in this embodiment, not only are the positions of the first mounting portion 1211 and the second mounting portion 1212 defined by the fastener 123, but the shims 124 further improve the positional accuracy of the first mounting portion 1211 and the second mounting portion 1212, preventing the second mounting portion 1212 from moving relative to the first mounting portion 1211 due to axial pressure during processing. This improves the processing accuracy of the second blade 1222, thereby improving the processing accuracy of the inclined surface 33 and the processing accuracy of the CRDM tube seat 10.

[0085] Reference Figure 4 and Figure 12 It is understood that the outer wall of the CRDM tube socket 10 also has an external thread 13 that mates with the control rod drive mechanism 40. To prevent the external thread 13 from being damaged, in some embodiments, the repair device 1000 further includes a protective sleeve 500, which is fitted onto the radial outer wall of the CRDM tube socket 10. The protective sleeve 500 has a second threaded hole 510, which mates with the external thread 13 located on the radial outer wall of the CRDM tube socket 10. Therefore, during processing, the locking member 210 abuts against the outer wall of the protective sleeve 500 to lock the CRDM tube socket 10 without contacting the external thread 13 of the CRDM tube socket 10, thereby reducing the risk of the external thread 13 of the CRDM tube socket 10 being damaged.

[0086] Reference Figure 3 , Figure 4 , Figures 11 to 13 In some embodiments, multiple locking elements 210 are connected to form an integral flexible locking sleeve 201. The locking sleeve 201 has a first receiving cavity for inserting the CRDM tube socket 10. The repair device 1000 also includes an adjusting element 230, which is an annular structure. The adjusting element 230 can reciprocate in the vertical direction and abut against the radial outer wall of the locking sleeve 201, so that the locking sleeve 201 contracts radially to lock the CRDM tube socket 10. For example, the locking sleeve 201 hugs the outer wall of the CRDM tube socket 10, or, as in the above embodiments, when a protective sleeve 500 is also included, the locking sleeve 201 hugs the outer wall of the protective sleeve 500 to increase the force-bearing area of ​​the protective sleeve 500, thereby improving the stability of the locking. In addition, since multiple locking elements 210 are connected to form an integral structure, it can be driven by fewer power components (a fifth power component), making the repair device 1000 of this embodiment smaller in weight and volume, thus facilitating high-altitude and confined space operations. Specifically, for example, the locking sleeve 201 is formed by connecting eight locking elements 210. If the locking elements 210 are a separate structure, eight adjusting elements 230 and eight fifth power elements are required accordingly. However, in this embodiment, the eight locking elements 210 are connected into a single structure, which only requires one adjusting element 230 and is driven by a relatively smaller number of fifth power elements. The fifth power elements can be one, two, or three (e.g., ...). Figure 11 As shown), the number of fifth power components is less than the number of locking components 210.

[0087] Reference Figure 13Based on the above embodiments, the locking sleeve 201 includes a plurality of deformation slots 212, which are distributed at intervals along the circumference of the locking sleeve 201 and penetrate the locking sleeve 201 radially to improve the deformation capacity of the locking sleeve 201. Further, the deformation slots 212 include a first deformation slot 2121 and a second deformation slot 2122, which are alternately distributed along the circumference of the locking sleeve 201. The first deformation slot 2121 has an upward opening, and the second deformation slot 2122 has a downward opening, improving the consistency of elasticity at both ends of the locking sleeve 201, thereby ensuring consistent contraction of the locking sleeve 201, thus increasing the locking strength and enhancing the stability of the repair equipment 1000, thereby improving the stability of the tool 120.

[0088] Reference Figure 12 Based on the above embodiments, the connector 220 includes an annular groove 222 with a radially inward opening, and the locking sleeve 201 includes a radially outward snap-fit ​​portion 211, which is movably snapped into the groove 222 to prevent the locking sleeve 201 from falling off.

[0089] Reference Figure 12 In some embodiments, the direction of movement of the adjusting member 230 when the locking sleeve 201 contracts radially is defined as a set direction (as shown vertically upward in the figures). Along the set direction, the outer diameter of the locking sleeve 201 gradually increases, and the inner diameter of the adjusting member 230 is less than the maximum value of the outer diameter of the locking sleeve 201. Therefore, during the movement of the adjusting member 230 along the set direction, the adjusting member 230 will compress the outer wall of the locking sleeve 201, causing the locking sleeve 201 to contract. Alternatively, in some embodiments, the inner diameter of the adjusting member 230 gradually increases along the set direction, and the outer diameter of the locking sleeve 201 is greater than the minimum value of the inner diameter of the adjusting member 230. Therefore, during the movement of the adjusting member 230 along the set direction, the adjusting member 230 will compress the outer wall of the locking sleeve 201, causing the locking sleeve 201 to contract.

[0090] Alternatively, in some embodiments, the outer diameter of the locking sleeve 201 gradually increases along a set direction, the inner diameter of the adjusting member 230 gradually increases, and the radial outer wall of the locking sleeve 201 fits against the radial inner wall of the adjusting member 230, increasing the contact area between the adjusting member 230 and the locking sleeve 201. This not only makes the locking sleeve 201 more evenly stressed, but also increases the contact area between the locking sleeve 201 and the adjusting member 230, thereby reducing the pressure between the locking sleeve 201 and the adjusting member 230, reducing wear between the locking sleeve 201 and the adjusting member 230, and thus extending the life of the repair device 1000 in this embodiment.

[0091] Reference Figure 5 and Figure 12In some embodiments, the top of the connector 220 further includes a limiting portion 221, which has a downward limiting surface 2211. The limiting surface 2211 is used to mate with the top surface of the protective sleeve 500 to ensure that the CRDM tube seat 10 is vertically positioned, thereby improving the machining accuracy of the CRDM tube seat 10. Specifically, for example, during machining, a circular repair hole is formed at the wear area of ​​the CRDM tube seat 10 for mate with the compensation component, that is, the setting surface 30 is the side wall surface and bottom wall surface of the circular repair hole. The top surface of the protective sleeve 500 is a plane perpendicular to the axial direction of the CRDM tube socket 10. Therefore, when the CRDM tube socket 10 is inserted into the repair device 1000 of this embodiment, the top surface of the protective sleeve 500 will contact the limiting surface 2211. By adjusting the position of the repair device 1000 of this embodiment, the limiting surface 2211 is made to fit with the top surface of the protective sleeve 500, thereby making the CRDM tube socket 10 vertical, so as to improve the machining accuracy of the setting surface 30, thereby improving the repair accuracy of the CRDM tube socket 10.

[0092] Reference Figure 11 and Figure 12 In some embodiments, the locking device 200 further includes at least three non-collinear positioning sensors 240 connected to the limiting portion 221. Each positioning sensor 240 includes a probe 241, the bottom end of which is flush with the limiting surface 2211. The positioning sensors 240 are configured such that when the top surface of the protective sleeve 500 is in contact with the limiting surface 2211, the detection signals of at least three positioning sensors 240 change. Specifically, three points in space define a plane. Therefore, when the detection signals of the three non-collinear positioning sensors 240 all change, it indicates that the top surface of the protective sleeve 500 is in contact with the limiting surface 2211, meaning that the CRDM tube socket 10 is in a vertical state. This eliminates the need for manual judgment, reducing errors caused by human factors and improving the repair accuracy of the CRDM tube socket 10.

[0093] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A nuclear reactor control rod drive mechanism tube seat repair device, characterized in that, This is used to complete the machining of the setting surface in the CRDM control rod drive mechanism tube seat of the nuclear reactor. The setting surface is used to cooperate with the inserted compensation component. The compensation component has a conical bottom countersunk hole and a mating surface at the bottom of the compensation component. The mating surface can abut against the setting surface so that the compensation component and the machined CRDM tube seat together define a round hole-conical bottom countersunk hole combination. Nuclear reactor control rod drive mechanism tube seat repair equipment includes: The repair device includes a drive system and a cutting tool. The drive system is connected to the cutting tool and is used to drive the cutting tool to move so as to machine the worn conical surface inside the CRDM tube seat into a set surface. A locking device includes a connector and multiple locking members. The connector is connected to the repair device, and the multiple locking members are connected to the connector and distributed around a set axis parallel to the vertical direction. The locking members are used to lock the CRDM tube socket. Each locking member can move horizontally relative to the connector to press against the outer wall of the CRDM tube socket, so that the repair device is fixed to the CRDM tube socket. A lifting frame, connected to the repair device or the locking device, is used for connecting to lifting equipment to lift the nuclear reactor control rod drive mechanism tube seat repair device onto the CRDM tube seat; The controller is communicatively connected to the drive system and the locking device, and is configured to: activate the locking device to lock the CRDM tube seat, and activate the drive system to drive the tool.

2. The nuclear reactor control rod drive mechanism tube seat repair equipment according to claim 1, characterized in that, The drive system includes a rotary mechanism and a radial drive mechanism. The radial drive mechanism is connected to the cutting tool and is used to drive the cutting tool to move horizontally. The rotary mechanism is connected to the radial drive mechanism and is used to drive the radial drive mechanism to move circumferentially around the set axis.

3. The nuclear reactor control rod drive mechanism tube seat repair equipment according to claim 2, characterized in that, The cutting tool includes a tool holder and multiple blades. The multiple blades are connected to the tool holder axially around the tool holder. The driving system also includes a rotating mechanism for driving the tool holder to rotate around its own axis. A radial driving mechanism is connected to the rotating mechanism for driving the rotating mechanism to move horizontally, thereby moving the cutting tool horizontally.

4. The nuclear reactor control rod drive mechanism tube seat repair equipment according to claim 3, characterized in that, The drive system further includes an axial drive mechanism connected to the cutting tool for driving the cutting tool to move vertically; a radial drive mechanism connected to the axial drive mechanism for driving the axial drive mechanism to move horizontally, thereby causing the cutting tool to move horizontally; and an axial drive mechanism connected to the rotary mechanism for driving the rotary mechanism to move vertically, thereby causing the cutting tool to move vertically.

5. The nuclear reactor control rod drive mechanism tube seat repair equipment according to claim 4, characterized in that, The nuclear reactor control rod drive mechanism tube seat repair equipment also includes a size detection device, which is connected to the axial drive mechanism and is used to detect the size of the set surface.

6. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 3, characterized in that, The defined surface includes a cylindrical surface, an annular plane, and an inclined surface. The outer edge of the annular plane is connected to the lower edge of the cylindrical surface, and the inclined surface is connected to the inner edge of the annular plane. The blade includes a first blade and a second blade. The first blade is located on the radial sidewall of the tool holder and is used to machine the cylindrical surface and the annular plane. The second blade is located at the axial end of the tool holder and is used to machine the inclined surface.

7. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 6, characterized in that, The tool holder includes a first mounting part and a second mounting part. The first blade is connected to the first mounting part. The first mounting part has a mounting hole coaxial with the tool holder. The second blade is connected to the second mounting part. The second mounting part is installed in the mounting hole and can move and lock relative to the first mounting part in a vertical direction to adjust the size of the second blade protruding from the mounting hole.

8. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 7, characterized in that, The second mounting portion has a first threaded hole communicating with the mounting hole. The first threaded hole is located on the side wall of the first mounting portion. The tool also includes a fastener, which passes through the first threaded hole and is threadedly engaged with the first mounting portion. The fastener can abut against the radial side of the second mounting portion.

9. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 8, characterized in that, The inner wall of the mounting hole includes a downward-facing first mounting surface, and the second mounting part has a second mounting surface facing the first mounting surface. The cutting tool also includes a plurality of shims of different thicknesses, each of which can be detachably disposed between the first mounting surface and the second mounting surface to adjust the size of the second blade protruding from the mounting hole.

10. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 6, characterized in that, Both the first blade and the second blade are detachably connected to the blade holder.

11. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 1, characterized in that, The nuclear reactor control rod drive mechanism tube seat repair equipment also includes a protective sleeve, which is used to fit onto the radial outer wall of the CRDM tube seat. The protective sleeve has a second threaded hole, which is used to engage with the external thread located on the radial outer wall of the CRDM tube seat. The locking member can abut against the protective sleeve to lock the CRDM tube seat.

12. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 11, characterized in that, A flexible locking sleeve is formed by connecting multiple locking elements together. The locking sleeve has a first receiving cavity for inserting the CRDM tube socket. The nuclear reactor control rod drive mechanism tube socket repair equipment also includes an adjusting element. The adjusting element is an annular structure and can reciprocate in the vertical direction, abutting against the radial outer wall of the locking sleeve to cause the locking sleeve to retract radially.

13. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 12, characterized in that, The direction of movement of the adjusting member when the locking member retracts radially is defined as the set direction. Along the set direction, the outer diameter of the locking member gradually increases, the inner diameter of the adjusting member gradually increases, the radial outer wall of the locking sleeve fits against the radial inner wall of the adjusting member, and the inner wall of the locking sleeve adapts to the radial outer wall of the protective sleeve. When the adjusting member moves along the set direction and squeezes the locking member, causing the locking sleeve to retract, the radial inner wall of the locking sleeve can fit against the radial outer wall of the protective sleeve.

14. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 11, characterized in that, The top of the connector also includes a limiting part, which has a downward limiting surface for engaging with the top surface of the protective sleeve to ensure that the CRDM tube seat is vertically positioned.

15. The nuclear reactor control rod drive mechanism tube seat repair device according to claim 14, characterized in that, The locking device further includes at least three non-collinear positioning sensors connected to the limiting part. Each positioning sensor includes a probe with its bottom end flush with the limiting surface. The positioning sensors are configured such that when the top surface of the protective cover is in contact with the limiting surface, the detection signals of at least three positioning sensors change.

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