Combined calandria insert release and removal tool and method of use thereof

Abstract

This invention provides an apparatus and method for removing a rolled-up connector insert. The apparatus includes: a body extending axially from a first end to a second end; and a movable seat coupled to the first end. The movable seat is configured to allow the body to extend into or retract from a grid point of a fuel passage assembly. The apparatus also includes a tool head having a distal end and a proximal end, the proximal end being coupled to the second end of the body, and the distal end having a surface configured to push an end of a pressure tube in a nuclear fuel passage to expose the rolled-up connector. The tool head includes: a heater for heating the rolled-up connector insert; a removal member for removing the rolled-up connector; and at least one centering member for centering the tool head within the grid point.

Description

[0001] Cross-reference to related applications and application for preference This application claims priority to U.S. Provisional Patent Application No. 63 / 584,055, filed September 20, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure generally relates to nuclear reactor fuel passage assemblies, and more specifically, to the removal of nuclear reactor fuel passage assemblies that have reached the end of their service life. Background Technology

[0003] Nuclear reactors have a limited operational lifespan. For example, second-generation CANDU... TM The type 1 reactor (“Canadian heavy water uranium”) is designed to operate for approximately 25 to 30 years. After this period, the existing fuel channels can be removed and new fuel channels installed. Performing this “re-pipe” process can significantly extend the reactor’s lifespan as an alternative to reactor decommissioning. The nuclear reactor re-pipe process involves the removal of numerous reactor components and includes various other activities such as shutting down the reactor, preparing the reactor cavity, installing material handling equipment, and various platform and equipment supports. The removal process may also include removing the occluder plug and locating hardware components, disconnecting the feeder assembly, cutting the bellows, removing end fittings, releasing and removing the manifold inserts, cutting and removing the pressure lines, and removing the manifold itself.

[0004] After the removal process is complete, an inspection and installation process is typically performed. For example, the tubesheets located at each end of the reactor include multiple holes. Each of these holes supports a fuel passage assembly spanning between the tubesheets. Once the fuel passage assembly has been removed, each tubesheet hole is inspected to ensure that the removal of the fuel passage assembly did not damage the tubesheet hole and that the tubesheet hole is ready for insertion of a new fuel passage assembly.

[0005] After confirming that the tube sheet is in the correct position, the manifold, pressure tube, end fittings, and other components can be reinstalled into the bore. For each fuel passage assembly, this process includes rolling the end of the manifold into the tube sheet of the manifold container (e.g., using a deformable manifold container insert), inserting the end fitting body into the bore, rolling the end of the pressure tube into the end fitting body, and inserting the end fitting liner into the end fitting.

[0006] Nuclear reactor overhaul and pipe replacement processes can take up to two years to complete. A significant portion of that time may be spent on the aforementioned removal processes. Therefore, improvements and acceleration of the removal of components from fuel passage assemblies are needed to reduce the time required for nuclear reactor overhaul. Summary of the Invention

[0007] In one aspect, this disclosure describes an apparatus for removing a rolled-in connector insert from between a manifold of a fuel passage assembly of a nuclear reactor and the tube sheet of the nuclear reactor, the rolled-in connector insert radially securing the manifold to the tube sheet. The apparatus includes: a body extending axially from a first end to a second end; a movable seat coupled to the first end, the movable seat configured to allow the body to extend into or retract from a grid point of the fuel passage assembly; and a tool head having a distal end and a proximal end, the proximal end coupled to the second end of the body, the distal end having a surface configured to push an end of a pressure tube in the grid point when the body extends into the grid point, the surface being positioned radially at a predetermined distance from the longitudinal axis of the tool head to intersect with the end of the pressure tube when the body extends into the grid point. The tool head includes: a heater positioned at the distal end of the tool head for heating the roll-fit insert; a removal member for coupling to the roll-fit insert and removing the roll-fit insert from between the tube bank and the tube sheet, the removal member being positioned at a predetermined distance inside the heater; and at least one centering member configured to center the head within the grid tube.

[0008] In one embodiment, the heater is an induction heating coil.

[0009] In one embodiment, the removal member is configured to extend and retract radially to engage with the roll-fit insert, wherein the removal member is configured to engage with the roll-fit insert for removing the roll-fit insert from the tube sheet. The removal member may be configured to move axially into a chamber defined by a tool head for receiving the roll-fit insert.

[0010] In one embodiment, the removal member has a reference member that is positioned to extend axially from the tool head and engage with the roll-fitted connection insert when the tool head is inserted into the grid point.

[0011] In one embodiment, the device includes a controller configured to: send data to a moving seat to cause a body to extend into a grid point, thereby pushing a pressure tube within the tube bank away from the rolled connection insert. In one embodiment, the controller may be configured to: send data to a heater to heat the rolled connection insert to a first temperature; after heating, allow the rolled connection insert to cool to a second temperature, which is lower than the first temperature; send data to axially move a tool head along a predetermined axis from a first position where the tool head is located when the rolled connection insert is heated to a second position where a removal member is radially aligned with the rolled connection insert; and send data to extend the removal member to radially engage the rolled connection insert and apply force to the rolled connection insert, wherein the heating of the rolled connection insert and the extension of the removal member to radially engage the rolled connection insert and apply force to the rolled connection insert are performed by the tool head.

[0012] In one embodiment, the controller is configured to send data to the cooler to cool the roll-fit insert to a second temperature, wherein the cooling is performed by at least one of the following: conduction by the cooler, convection generated by the cooling medium supplied by the nozzles defined by the cooler, and radiation absorption by the cooler.

[0013] In one implementation, the controller communicates with a workbench and platform, wherein the device is positioned on the workbench, and the controller is configured to send data to the workbench and platform to move the device to a grid point of the nuclear reactor, including the fuel passage assembly. The controller may also be configured to send data to the workbench to push a tool head toward a pressure tube within the pipework, away from the rolling connection.

[0014] In one embodiment, the controller is configured to record a reference position and move the tool head a predetermined distance from the reference position to a position where the heater and the rolling connection insert are radially aligned.

[0015] In one embodiment, at least one centering member includes a plurality of rollers and at least one sleeve for centering the tool head within the grid points.

[0016] In another aspect, this disclosure describes a method for removing a rolled-in connector insert from between a manifold of a fuel channel assembly of a nuclear reactor and the tube sheet of the nuclear reactor, the rolled-in connector insert radially securing the manifold to the tube sheet. The method includes: pushing a pressure tube within the manifold away from the rolled-in connector insert; heating the rolled-in connector insert to a first temperature; allowing the rolled-in connector insert to cool to a second temperature, lower than the first temperature, after heating; axially moving a tool head along a predetermined axis from a first position where the tool head is located when the rolled-in connector insert is heated to a second position where a removal member is radially aligned with the rolled-in connector insert; extending the removal member to radially engage the rolled-in connector insert and apply force to the rolled-in connector insert. The heating of the rolled-in connector insert and the extension of the removal member to radially engage the rolled-in connector insert and apply force to the rolled-in connector insert are performed by the tool head.

[0017] In one embodiment, the method includes axially withdrawing a rolled connection insert from a tube sheet.

[0018] In one embodiment, the first temperature is between 800°C and 1500°C.

[0019] In one embodiment, the rolled connection insert reaches the first temperature within 1.8 to 2.2 seconds.

[0020] In one embodiment, the second temperature is between 20°C and 180°C.

[0021] In one embodiment, the heating defines a heating zone in which the tube sheet is not heated when the roll-fitted connection insert is heated.

[0022] In one implementation, heating is performed by at least one of induction, conduction, and convection.

[0023] In one implementation, cooling is achieved by at least one of conduction, convection, and radiation.

[0024] In one embodiment, the method includes placing the extracted rolled connection insert into a sealing container.

[0025] In one embodiment, the method includes: recording a reference position when the removal component is positioned near the roll-fitted connector insert; and moving a tool head a predetermined distance from the reference position to a first position.

[0026] Implementation methods may include combinations of the above features.

[0027] Further details of these and other aspects of the subject matter of this application will become apparent from the detailed embodiments and accompanying drawings included below. Attached Figure Description

[0028] Now refer to the attached diagram, in which: Figure 1 It is CANDU TM A three-dimensional view of a type of reactor.

[0029] Figure 2A It is CANDU TM Cross-sectional view of the fuel channel assembly of a nuclear reactor.

[0030] Figure 2B It is based on the adjacent CANDU of the implementation method TM A perspective view of the end face platform, workbench, and pipe insert removal tool of the reactor.

[0031] Figure 3 This is a perspective view of an exemplary combined tubing insert (CTI) release and removal tool.

[0032] Figure 4 yes Figure 3 A perspective view of the tool head of the CTI release and removal tool 100 shown.

[0033] Figure 5 It is in an extended position. Figure 3 The CTI release and remove tool is shown in a side view of the target grid point, with the tool head extending into the target grid point.

[0034] Figure 6 Is Figure 3 A side cross-sectional view of the pressure tube and the sealing plug at opposite ends of the target grid point shown.

[0035] Figure 7 It includes grid points, pipe inserts, and Figure 4 A side sectional view of the tool head in its reference position. A partial view of detail A is also shown.

[0036] Figure 8 It includes grid points, pipe inserts, and Figure 4 A side section view of the tool head in the released position.

[0037] Figure 9A and Figure 9B This is a side sectional view of the grid points and pipe inserts, showing... Figure 4 Move the tool head to the CTI cooling / removal location. Figure 9A It shows Figure 4 The tool head is positioned to engage with the CTI and apply force to the CTI to release it from the tube sheet. Figure 9B The tool head removal component is shown moving the CTI into the tool head chamber.

[0038] Figure 10This is a schematic diagram of an exemplary method for removing a rolled connection insert from between the pipes of a fuel passage assembly of a nuclear reactor and the tube sheet of the nuclear reactor.

[0039] Figure 11 This is a schematic diagram of an exemplary system for controlling the release and removal of a tube insert (CTI) tool. Detailed Implementation

[0040] Before providing a detailed description of any implementation, it should be understood that this disclosure is not limited to its application in the construction details and component arrangements described below or shown in the accompanying drawings. This disclosure may be implemented or carried out in other ways.

[0041] limited Although terms such as “maximize,” “minimize,” and “optimize” may be used in this disclosure, it should be understood that such terms may be used to refer to improvements, adjustments, and enhancements, rather than being strictly limited to maximum, minimum, or optimal.

[0042] The term “connection” or “coupled to” can include direct coupling (where two elements are coupled to and in contact with each other) and indirect coupling (where at least one additional element is located between the two elements).

[0043] The term “substantially” as used in this application may be used to modify any quantitative description which may vary within permissible limits without altering its relevant essential function.

[0044] Terms such as “up to,” “at least,” “greater than,” “less than,” “more than,” or “or above” include the numbers mentioned, and such terms indicate a range that can be further subdivided into sub-ranges. In the same manner, all ratios described in this application also include all sub-ratios falling within the wider range of ratios.

[0045] Unless the context clearly specifies otherwise, the singular forms of “a,” “an,” and “the” include the plural meaning. The term “and / or” refers to any one, any combination of, or all of the items associated with this term.

[0046] The term "about" may refer to a range of variation of ±5%, ±10%, ±20%, or ±25% of the specified value. For example, "about 50%" may represent a range of variation of 45% to 55% in some embodiments. For integer ranges, the term "about" may include one or two integers greater than and / or less than the mentioned integer at each end of the range. Unless otherwise stated in this application, the term "about" is intended to include values ​​and ranges that are close to the mentioned range and are functionally equivalent in construction or implementation.

[0047] The various embodiments are described with reference to the accompanying drawings.

[0048] Figure 1 It is CANDU TM A perspective view of the reactor core of reactor type 6. The reactor core is typically housed within a cavity sealed by a gaslock for radiation control and shielding. Although this disclosure specifically refers to CANDU for convenience... TM The CANDU reactor type 6 provides explanations of various aspects, but this disclosure is not limited to CANDU. TM This type of reactor, while potentially useful outside this specific field, is generally cylindrical and can also be used in applications such as CANDU reactors. TM The pipe container 10 of the reactor type 6 contains heavy water moderator. The pipe container 10 has an annular outer shell 14 and tube sheets 18 at a first end 22 and a second end 24. The tube sheet 18 includes a plurality of orifices (referred to as orifices 19 in this application), each orifice receiving a fuel passage assembly 28. Figure 1 As shown, several fuel passage assemblies 28 extend from the first end 22 through the tube sheet 18 of the pipe container 10 to the second end 24.

[0049] like Figure 1 and Figure 2A In some embodiments shown, the reactor core has two walls at each of its ends 22, 24: an inner wall defined by a tube sheet 18 at each end 22, 24 of the reactor core, and an outer wall 64 (often referred to as an "end shield") located at a distance outside the tube sheet 18 at each end 22, 24 of the reactor core. A grid tube 65 spans the distance between the tube sheet 18 and the end shield 64 at each pair of holes 19 (i.e., holes in the tube sheet 18 and the end shield 64, respectively).

[0050] Figure 2A yes Figure 1 A cross-sectional view of a fuel channel assembly 28 of the reactor core is shown. Figure 2AAs shown, each fuel passage assembly 28 includes a tube bundle (“CT”) 32 surrounding other components of the fuel passage assembly 28. Each CT 32 spans the distance between tube sheets 18. Furthermore, the opposite ends of each CT 32 are received and sealed within respective orifices 19 in the tube sheets 18. In some embodiments, roll-fitted connectors (e.g., tube bundle inserts 34) are used to secure the CT 32 to the tube sheet 18 within the orifices 19. Pressure tubes (“PT”) 36 form the inner wall of the fuel passage assembly 28. PT 36 provides conduit for reactor coolant and fuel rod bundles or assemblies 40. For example, PT 36 typically accommodates two or more fuel assemblies 40 and serves as conduit for reactor coolant flow through each fuel assembly 40. An annular space 44 is defined by the gap between each PT 36 and its corresponding CT 32. The annular space 44 is typically filled with a circulating gas, such as dry carbon dioxide, helium, nitrogen, air, or a mixture thereof. One or more annular spacers or ring springs 48 are arranged between CT 32 and PT 36. The annular spacers 48 maintain the gap between PT 36 and the corresponding CT 32, while allowing annular gas to pass through and flow around the annular spacers 48.

[0051] Just like Figure 2A As shown, each end of each fuel passage assembly 28 is provided with an end fitting assembly 50 located outside the corresponding tube sheet 18. Each end fitting assembly 50 includes an end fitting body 57 and an end fitting liner 58. At the end of each end fitting assembly 50 is a sealing plug 52. Each end fitting assembly 50 also includes a feeder assembly 54. The feeder assembly 54 supplies reactor coolant to or removes reactor coolant from the PT 36 via a feeder pipe 59. Figure 1 Specifically, for a single fuel channel assembly 28, the feeder assembly 54 at one end of the fuel channel assembly 28 serves as an inlet feeder, while the feeder assembly 54 at the opposite end of the fuel channel assembly 28 serves as an outlet feeder. Figure 2A As shown, the feeder assembly 54 can be attached to the end fitting assembly 50 using a coupling assembly 56, which includes a plurality of screws, gaskets, seals, and / or other types of connectors. A grid tube 65 (as described above) covers the connection between the end fitting assembly 50 and the PT 36 housing the fuel assembly 40. Shielded ball bearings 66 and cooling water surround the exterior of the grid tube 65, providing additional radiation shielding.

[0052] Positioning hardware assembly 60 and bellows 62 are also coupled to each end fitting assembly 50. Bellows 62 enables axial movement of fuel passage assembly 28—a capability important in situations where fuel passage assembly 28 undergoes length changes over time (common in many reactors). Positioning hardware assembly 60 can be used to set the end of fuel passage assembly 28 to a locked or unlocked configuration with a fixed axial position. Positioning hardware assembly 60 is also coupled to end shield 64. Each illustrated positioning hardware assembly 60 includes a rod with an end received in a bore in its respective end shield 64. In some embodiments, the rod end and the bore in the end shield 64 are threaded. Similarly, it should be understood that, although in Figures 1-2A CANDU was shown in TM This invention pertains to type 1 reactors, but it can also be applied to other types of reactors, including those with [specific characteristics]. Figures 1-2A The reactor has components similar to those shown.

[0053] Rolled connector inserts (e.g., pipe insert 34) can be used to secure pipe 32 to tube sheet 18 within bore 19. During decommissioning, the rolled connector insert needs to be removed so that the pipe can also be removed. Previously, the release and removal of the pipe insert (CTI) were performed separately and sequentially. The CTI release tool was mounted on the fuel changer bridge (FMB), which historically caused accessibility issues to the fuel passage. Separate CTI release and removal operations required coordinating the movement of the fuel passage platform (FCP), heavy-duty worktable (HWT), FMB, and FMB moving base. In contrast, combined CTI release and removal operations minimize the interaction with the movement of the FCP, HWT, and FMB. Combining the CTI release and removal tools simplifies the coordination of tool movement at the pipe container end face and reduces fuel passage accessibility issues for the pipe container. An exemplary combined CTI release and removal device is described in International Patent Application No. PCT / CA2018 / 050770 (published as WO2018232526A1), the entire contents of which are incorporated herein by reference.

[0054] Figure 2B One embodiment of a heavy-duty workbench (“HWT”) 96 is shown, wherein the heavy-duty workbench 96 is mounted on a pipe-changing tool platform (“RTP”) 95 and adjacent to end 24 of the nuclear reactor. A similar HWT may be mounted adjacent to end 22 of the nuclear reactor. The HWT 96 and any tools mounted on the HWT are controlled via a control station (not shown).

[0055] A tube insert removal tool—CTI removal tool 100—is mounted on HWT 96 and positioned to remove tube inserts 34 from tube sheet 18 at end 24. As shown, CTI removal tool 100 can be positioned at the end face of the nuclear reactor. The position of CTI removal tool 100 relative to end shield 64 and the operation of tool 100 can be controlled by a control station. Specifically, the operator can control the height of RTP 95 along axis Y, the position of CTI removal tool 100 on HWT 96 along axis X, and the pitch angle relative to end shield 64 to orient axis Z perpendicular to end shield 64. In some embodiments, the height of RTP 95 can be adjusted by ball screws, for example, at one ball screw at each corner of RTP 95.

[0056] When the CTI removal tool 100 is aligned with the selected opening in the end shield 64, the operator can insert the CTI removal tool 100 into the corresponding fuel passage along axis Z. The CTI removal tool 100 may include any number of suitable sensors and / or cameras to verify that the CTI removal tool 100 is correctly aligned with the corresponding opening in the end shield 64.

[0057] Figure 2B The induction heating power supply and control system 98 shown can be used to control the heater 103 of the CTI removal tool 100, which will be described further below.

[0058] Figure 3 A perspective view of an exemplary combined CTI release and removal tool 100 is shown. The combined CTI release / removal tool 100 can be designed to combine the release and removal functions of CTI from the pipework plate into a single tool head, such as... Figure 3 As shown. The CTI release and removal tool 100 may have a head 101 that pushes the PT 36 further inward. Impact heating of the CTI can be performed using an electrically powered coil in a manner similar to existing release tools, wherein power is supplied by a CTI release load matching station (LMS) in the moving base 102. After removing the CTI using the removal components, the CTI release and removal tool 100 can place the CTI into a waste transfer container.

[0059] Figure 4 Showing Figure 3 The diagram shows a perspective view of the tool head 101 of the CTI release and removal tool 100. The CTI release and removal tool 100 may include a heater 103, a removal component 104, at least one centering component 105, and a camera 106. Figure 4In the embodiment of the illustrated tool head 101 geometry, a heater 103 is positioned at the distal end of the tool head 101 for heating the target CTI. A removal member 104 may be centrally positioned on the tool head 101 and adjacent to the heater 103 for removing the CTI insert 34. In one embodiment, the heater 103 may be an induction heating coil for heating the pipe insert 34 without substantially heating the pipe sheet 18. Heating may be performed using induction, conduction, or convection heating elements to increase the temperature of the target CTI. In one embodiment, at least one centering member is configured to center the head within the grid tube. The centering member 105 may include a plurality of rollers and / or sleeves positioned to center the tool head 101 within the grid tube of the nuclear reactor. The centering member 105 may be positioned at approximately equal distances from the grid point and / or the inner diameter of the pipe insert, including the heating coil 103 and / or the removal member 104, around the periphery of the tool head 101.

[0060] Figure 5 A CTI release and removal tool 100 at a target grid point is shown. The CTI removal tool 100 can be operated on an HWT at an opposite end 22 of the nuclear reactor 6. After the sealing plug 52, positioning hardware assembly 60, feeder assembly 54, and end fittings are removed, a temporary shielding plug (not shown), also referred to as a “pushpin plug” 68, is inserted through the end shield 64 into the grid tube 65. In some embodiments, the temporary shielding plug may be contained within a grid sleeve assembly (“LSA”). In some embodiments, the pushpin plug 68 may include a sleeve, a temporary shielding plug within the sleeve, and a flange. In some embodiments, the bellows 62 may also be removed before or after inserting the temporary shielding plug through the end shield 64 into the grid tube 65.

[0061] In some implementations, the CTI removal tool 100 is aligned with the end shield 64 via a tack plug 68. The temporary shield of the tack plug 68 can be removed before the CTI removal tool 100 is inserted.

[0062] During the CTI release and removal tool 100 operation, such as Figure 5 As shown, tool 100 is inserted into the target grid tube 65 and CT 32. Subsequently, CTI removal tool 100 can be moved along the direction of arrow BB to insert end shield 64. CTI removal tool 100 can be moved into or out of tube sheet 18 by any suitable method, such as using a rigid push-pull chain or servo rack and pinion drive. The position of CTI removal tool 100 on HWT 96 can be controlled by the operator via a control station. As discussed in detail below, CTI removal tool 100 can be precisely inserted to the desired depth.

[0063] When the CTI release and removal tool 100 is inserted into the target grid point and fuel passage, the tool 100 can be centered in the pipe insert 34 by means of a centering member 105 located on the tool head 101. The centering member 105 can prevent damage to the heater 103 due to misalignment. In one embodiment, the centering member 105 may be a roller and / or sleeve positioned around the circumference of the tool head 101 and configured to extend to contact the inner diameter of the target grid point and / or fuel passage, such that the heater 103 and / or removal member 104 do not contact the grid point and / or fuel passage when the tool head 101 is inserted. The camera 106 can assist in positioning and placing the tool 100 within the CT 32. The CTI release and removal tool 100 can be advanced to contact the end of the PT 36, thereby pushing the PT 36 within the CT 32. The tool head 101 can push the PT 36 relative to the CT 32 within the CT 32 to allow the tool head 101 to access the target CTI. In one implementation, as... Figure 4 and Figure 7 As shown, the tool head 101 may include a surface 101a for engaging the PT 36, the surface 101a being positioned radially distanced from the longitudinal axis L of the tool head 101 and configured to intersect the end of the PT 36 when the tool head 101 is advanced into the grid point and / or fuel passage. Figure 6 As shown, at the opposite ends of PT 36, the pushed PT 36 can be maintained in the gap 107 between the opposite ends of PT 36 and the pin plug 68 at the opposite side of the target grid point.

[0064] like Figure 7 As shown, the CTI release and removal tool 100 can move the tool head 101 to a reference position, for example, the position where the reference member 104A on the removal member 104 reaches the outer end of the CTI 34. Subsequently, the CTI release and removal tool 100 can move to... Figure 8 The CTI release position is shown. In one embodiment, tool 100 can retract a predetermined amount from the reference position to align and adjoin CTI 42, thereby axially centering heater 103 within CTI 34. Heater 103 can then impact heat CTI 34.

[0065] In some embodiments, the pipe insert 34 is heated for a set time and / or heated to a set temperature. In some embodiments, the heating duration can be between 1 and 10 seconds, between 1 and 4 seconds in one embodiment, and more than 10 seconds in other embodiments. In some embodiments, heating can bring the pipe insert 34 to a target temperature between 800 and 1500 degrees Celsius. In one embodiment, the pipe insert 34 is heated to 1300 degrees Celsius in 1.8 to 2.2 seconds. One or more sensors (e.g., optical sensors, thermocouples, or other suitable sensors) can be used to measure various characteristics of the pipe insert 34.

[0066] In some embodiments, the pipe insert 34 is subjected to "impact heating" according to a specific time and energy curve, for example, using induction heating. An operator can use a timer or computer control to operate the heater 103 at set times. In some embodiments, the heater 103 can be automatically operated using control logic until the end of a specific time period and / or until the pipe insert 34 reaches a set temperature or the required energy level transfer is complete.

[0067] like Figure 9A and Figure 9B As shown, the CTI release and removal tool 100 can be moved to the CTI cooling / removal position. In one embodiment, the tool 100 can be moved to the CTI cooling / removal position, for example, approximately 60 seconds after the heater 103 finishes its impact heating of the CTI 34. After heating, the CTI insert can radially retract as it cools, thereby disengaging it from the hole in the manifold plate 18. Figure 9A As shown, the tool head 101 can move further inward from the CTI reference position, thereby pushing PT 36 toward the opposite side of the pipe container 10. In one embodiment, PT 36 is only pushed to make the gap 107 greater than or equal to the distance between them. Figure 6 The minimum spacing (e.g., approximately 1 inch) of the tack plugs 68 is designed to ensure that the tack plugs 68 cannot be pushed out. To remove CTI 34, member 104 can be extended radially by gradually increasing force until CTI 34 is released from tube sheet 18. Subsequently, member 104 can be moved axially to pull CTI 34 into tool 100. Tool 100 may include a chamber 108 for receiving CTI 34 and member 104. Once CTI 34 is secured, CTI release and removal tool 100 can be withdrawn from the grid point to... Figure 5 The starting position is shown, where CTI 34 can be placed into a waste transfer container (not shown).

[0068] In one embodiment, the cooling section of the CTI release and removal tool 100 includes at least one cooling element 109 (“cooler”) that cools the pipe insert 34 to a desired temperature by at least one of conduction and convection. The cooling element 109 may be in fluid communication with a fan, pump, or pressurization system (not shown) to provide a cooling medium to the cooler 109. In some embodiments, the cooling medium may be at least one of liquid nitrogen, a cold gas jet, a cooling coil, an alcohol bath, liquid lead, helium, or dry ice, which directly contacts the pipe insert 34, for example, guided by a nozzle 109 on the CTI removal tool 100, or through a barrier. In some embodiments, the cooling element 109 may include a heat pipe. For example, the cooling medium may circulate within the heat pipe of the cooling element and be surrounded by a thermally conductive material (e.g., metal), and the thermally conductive material of the heat pipe may contact the pipe insert 34 to actively cool the pipe insert 34. In some embodiments, the cooling section may include a radiator, for example, as a blackbody heat sink, to absorb heat energy from the pipe insert 34. Heat pipes and blackbody heat sinks may be advantageous because they do not blow air, disturb, and / or carry radioactive debris. In some embodiments, removal component 104 may include a cooling element. Figure 9A In the illustrated embodiment, the cooling element includes a nozzle 109 for directing a cooling medium (e.g., air) from a fan (not shown) to the pipe insert 34. However, the removal member 104 may also include a heat pipe and / or a blackbody heat sink for receiving heat energy from the pipe insert 34.

[0069] In some implementations, such as Figure 9A and Figure 9B As shown, the removal member 104 may extend to an adjacent pipe insert 34 to perform cooling of the pipe insert 34. In some embodiments, the removal member contacts at least a portion of the inner diameter of the pipe insert 34. In some embodiments, the removal member contacts a large portion of the inner diameter of the pipe insert 34. In one embodiment, the cooling element 109 of the removal member 104 may include a nozzle 109a to direct a cooling medium (e.g., air) to the pipe insert 34. In another embodiment, the cooler 109 may be cooled, for example, by a heat pipe and / or a blackbody heat sink, such that the removal member 104 will cool the pipe insert 34 when engaged with it.

[0070] Figure 10 A schematic diagram is shown illustrating a method 1000 for removing a rolled-in connector insert from between the manifold of a fuel channel assembly and the tube sheet of a nuclear reactor. The rolled-in connector insert radially secures the manifold to the tube sheet.

[0071] In 1002, the method includes pushing the pressure tube within the manifold away from the rolled connection insert.

[0072] In 1004, the method includes heating the rolled connection insert to a first temperature. In one embodiment, the first temperature is between 800°C and 1500°C. In one embodiment, the rolled connection insert reaches the first temperature within 1.8 to 2.2 seconds. The rolled connection insert can be heated in a defined heating zone where the tube sheet is not heated, or at a lower rate than the rolled connection insert. Non-limiting embodiments of heating can be performed by at least one of induction, conduction, and convection.

[0073] In step 1006, after heating, the method includes allowing the rolled connection insert to cool to a second temperature, which is lower than the first temperature. In one embodiment, the second temperature is between 20°C and 180°C. Non-limiting embodiments of cooling can be performed by at least one of conduction and convection.

[0074] In 1008, the method includes moving the tool head axially along a predetermined axis from a first position where the tool head is located when the heated rolling connection insert is inserted to a second position where the removal member is radially aligned with the rolling connection insert.

[0075] In 1010, the method includes extending the removal member to radially engage with the rolled connection insert and applying force to the rolled connection insert. Heating the rolled connection insert and extending the removal member to radially engage with the rolled connection insert and applying force to the rolled connection insert are performed by a tool head.

[0076] In one embodiment, method 1000 includes axially withdrawing a rolled connection insert from a tube sheet.

[0077] In another embodiment, method 1000 includes placing the extracted rolled connection insert into a sealing container.

[0078] In another embodiment, method 1000 includes: recording a reference position when the removal component is positioned near the roll-fitted connector insert; and moving the tool head a predetermined distance from the reference position to a first position.

[0079] controller Figure 11A schematic diagram of an exemplary system 2000 for controlling a cutting tool used to segment pipe containers is shown. System 2000 may include a controller 2001 as described in this application. Controller 2001 includes a processor 2002 configured to implement processor-readable instructions, which, when executed, configure the processor 2002 to perform the operations described in this application. Processor 2002 may be a microprocessor or microcontroller, a digital signal processing (DSP) processor, an integrated circuit, a field-programmable gate array (FPGA), a reconfigurable processor, a programmable read-only memory (PROM), or a combination thereof. Controller 2001 may include a communication interface 2004 for communicating with other computing devices or sensor devices to access or connect to network resources, or to perform other computing applications by connecting to a network (or multiple networks) capable of transmitting data. In some examples, communication interface 2004 may include one or more buses, interconnects, wires, circuits, and / or any other connectors and / or control circuitry, or combinations thereof. Communication interface 2004 can provide an interface for data communication between system 2000 and display 2015.

[0080] The controller 2001 may also include a connector for communicating with any one of the CTI release / removal tool 100, worktable 96, platform 95, removal component 104, heater 103 and / or camera 106 according to the present disclosure to transmit setpoints (one or more) or receive data such as position, orientation, CTI release / removal tool status and other data.

[0081] The controller 2001 may include a sensor 2010 and a connector (one or more) for monitoring position, orientation and / or CTI release / removal tool status.

[0082] Controller 2001 may be coupled to data system 2014 for storing system data and / or may be configured to communicate with cloud services such as iCloud, Dropbox, Google Cloud, or any other digital data server. Data system 2014 may also include a Universal Asynchronous Receiver / Transmitter (UART) to allow communication with other devices, such as smartphones or computers, to transmit data for analysis and / or storage. The UART may include or be coupled to a wireless transceiver for wireless communication with other such devices, such as via infrared, Bluetooth, Wi-Fi, etc. Network 2500 may include any wired or wireless communication path, such as circuitry. In some embodiments, network 2500 may include one or more buses, interconnects, wires, circuits, and / or any other connectors and / or control circuitry, or combinations thereof. In some embodiments, network 2500 may include a wired or wireless wide area network (WAN), local area network (LAN), or a combination thereof. In some embodiments, network 2500 may include a Bluetooth® network, a Bluetooth® Low Energy network, a Short Range communication network, etc.

[0083] The controller 2001 may include a memory 2006. The memory 2006 may include one or a combination of computer memories such as static random access memory (SRAM), random access memory (RAM), read-only memory (ROM), electro-optic memory, magneto-optic memory, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferroelectric random access memory (FRAM), etc.

[0084] Memory 2006 may store application program 2012, which includes processor-readable instructions for performing the operations described in this application. In some embodiments, application program 2012 may include operations for controlling the CTI release / removal tool according to this disclosure.

[0085] In one implementation, application 2012 may include operations for moving a workbench and platform to position a CTI release and removal tool for insertion into a grid point of the nuclear reactor. Application 2012 may also include operations for moving the workbench toward the end shield of the nuclear reactor to insert the CTI release and removal tool into the grid point.

[0086] Application 2012 may also include operations for pushing a pressure tube within the tube bank away from the roll-fit insert, for example, by moving the worktable and the CTI release and removal tool thereon toward the end shield to move the end of the CTI release and removal tool into contact with the pressure tube. The CTI release and removal tool may also be configured to move independently of the worktable and may extend its head to contact the pressure tube, thereby pushing the pressure tube within the tube bank away from the tube bank insert. In one embodiment, application 2012 may include operations for sending data to the moving seat of the CTI release and removal tool to extend the body of the CTI release and removal tool to the grid point, thereby pushing the pressure tube within the tube bank away from the tube bank insert.

[0087] In another embodiment, application 2012 may further include operations for heating the rolled connection insert to a first temperature. In one embodiment, the first temperature is between 800°C and 1500°C. The rolled connection insert can reach the first temperature within 1.8 to 2.2 seconds. Heating can be confined to a heating zone in which the tube sheet is not heated while the rolled connection insert is being heated. Heating can be performed by at least one of induction, conduction, and convection.

[0088] Application 2012 may also include operations for allowing the rolled connection insert to cool to a second temperature, which is lower than the first temperature, after heating. In one embodiment, the second temperature is between 20°C and 180°C. Cooling can be achieved by at least one of conduction and convection.

[0089] Application 2012 may also include operations for axially moving the tool head from a first position where the tool head is located when the heated rolling connection insert is inserted to a second position where the removal member is radially aligned with the rolling connection insert, along a predetermined axis.

[0090] Application 2012 may also include operations for extending the removal clamp member to radially engage the rolled connection insert and applying force to the rolled connection insert. In one embodiment, application 2012 may also include operations for axially withdrawing the rolled connection insert from the tube sheet. Heating the rolled connection insert and extending the removal member to radially engage the rolled connection insert and applying force to the rolled connection insert are both performed by the tool head.

[0091] In one implementation, application 2012 may also include operations for placing the extracted roll-fit insert into a sealing container.

[0092] In one embodiment, application 2012 may further include operations for recording a reference position when the removed component is positioned near the roll-fit insert, and operations for moving the tool head a predetermined distance from the reference position to a first position. The reference position may also be recorded when any other part of the tool head is positioned near a component of the nuclear reactor, such as when the camera at the end of the tool head is first inserted into the grid tube.

[0093] Alternative implementation methods The above description is merely exemplary, and those skilled in the art will recognize that changes can be made to the described embodiments without departing from the scope of the disclosed invention. This disclosure may be embodied in other specific forms without departing from the subject matter of the claims. This disclosure is intended to cover and include all suitable changes in technical aspects. Modifications falling within the scope of this invention will be apparent to those skilled in the art upon reading this disclosure, and such modifications should be considered to fall within the scope of the appended claims. Furthermore, the scope of the claims should not be limited to the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the overall specification.

[0094] It is understood that the above description and the specific embodiments shown are merely exemplary. The present invention is defined by the appended claims.

[0095] The claims are not intended to include, and should not be construed as including, means-plus-function or step-plus-function limitations unless such limitations are expressly referred to in a given claim using “means for…” or “step for…”.

Claims

1. A device for removing a rolled-in connector insert from between a pipe section of a fuel channel assembly of a nuclear reactor and the tube sheet of the nuclear reactor, the rolled-in connector insert radially securing the pipe section to the tube sheet, characterized in that, The device includes: The main body extends axially from a first end to a second end; A movable seat coupled to the first end, the movable seat being configured to allow the body to extend into a grid point of the fuel passage assembly or to retract the body from a grid point of the fuel passage assembly; A tool head having a distal end and a proximal end, the proximal end being coupled to a second end of the body, the distal end having a surface configured to push an end of a pressure tube in the grid point when the body extends into the grid point, the surface being positioned radially at a predetermined distance from the longitudinal axis of the tool head to intersect the end of the pressure tube when the body extends into the grid point, the tool head comprising: A heater, positioned at the distal end of the tool head, for heating the rolled connection insert; A removal component, which is coupled to the rolled connection insert and removes the rolled connection insert from between the pipe array and the tube sheet, the removal component being positioned at a predetermined distance inside the heater; and At least one centering member is configured to center the head within the grid tube.

2. The device according to claim 1, characterized in that, The heater is an induction heating coil.

3. The device according to claim 1, characterized in that, The removal member is configured to extend radially and retract to engage with the rolled connection insert, and wherein the removal member is configured to engage with the rolled connection insert for removing the rolled connection insert from the tube sheet.

4. The device according to claim 3, characterized in that, The removal member is configured to move axially into a chamber defined by a tool head for receiving the rolled connection insert.

5. The device according to any one of claims 1-4, characterized in that, The removal member has a reference member positioned to extend axially from the tool head and engage with the roll-fit insert when the tool head is inserted into the grid point.

6. The device according to any one of claims 1-5, characterized in that, Includes a controller, which is configured to: Data is sent to the movable seat to cause the main body to extend into the grid point, thereby pushing the pressure tube inside the pipe away from the rolling connection insert.

7. The device according to claim 6, characterized in that, The controller is configured to: Data is sent to the heater to heat the rolled connection insert to a first temperature; After heating, the rolled connection insert is allowed to cool to a second temperature, which is lower than the first temperature; Data is sent to move the tool head axially along a predetermined axis from a first position where the tool head is located when the rolled connection insert is heated to a second position where the removal member is radially aligned with the rolled connection insert; Data is sent to extend the removal member to radially engage with the rolled connection insert and apply force to the rolled connection insert; The heating of the rolled connection insert and the extension of the removal member to radially engage with the rolled connection insert and apply force to the rolled connection insert are performed by the tool head.

8. The device according to claim 7, characterized in that, The controller is configured to send data to the cooler to cool the rolled connection insert to the second temperature, wherein the cooling is performed by at least one of the following: conduction by the cooler, convection generated by the cooling medium supplied by the nozzles defined by the cooler, and radiation absorption by the cooler.

9. The device according to any one of claims 6-8, characterized in that, The controller communicates with the workbench and platform, wherein the device is positioned on the workbench, and wherein the controller is configured to send data to the workbench and platform to move the device to a grid point of the nuclear reactor including the fuel passage assembly.

10. The device according to claim 9, characterized in that, The controller is configured to send data to the worktable to push the tool head toward the pressure tube inside the pipe, away from the rolling connection.

11. The device according to claim 9 or 10, characterized in that, The controller is configured to record a reference position and move the tool head a predetermined distance from the reference position to a position where the heater is radially aligned with the rolling connection insert.

12. The device according to any one of claims 1-11, characterized in that, The at least one centering member includes at least one of a plurality of rollers and a sleeve for centering the tool head within the grid points.

13. A method for removing a rolled-in connector insert from between a pipe section of a fuel channel assembly of a nuclear reactor and the tube sheet of the nuclear reactor, the rolled-in connector insert radially securing the pipe section to the tube sheet, characterized in that, The method includes: Push the pressure tube inside the pipe arrangement away from the rolled connection insert; The rolled connection insert is heated to a first temperature; After heating, the rolled connection insert is cooled to a second temperature, which is lower than the first temperature; The tool head is axially moved along a predetermined axis from a first position where the tool head is located when the rolled connection insert is heated to a second position where the removal member is radially aligned with the rolled connection insert; Extend the removal member to radially engage with the rolled connection insert and apply force to the rolled connection insert; The heating of the rolled connection insert and the extension of the removal member to radially engage with the rolled connection insert and apply force to the rolled connection insert are performed by the tool head.

14. The method according to claim 13, characterized in that, This includes axially withdrawing the rolled connection insert from the tube sheet.

15. The method according to claim 13 or claim 14, characterized in that, The first temperature is between 800°C and 1500°C.

16. The method according to any one of claims 13-15, characterized in that, The rolled connection insert reaches the first temperature within 1.8 to 2.2 seconds.

17. The method according to any one of claims 13-16, characterized in that, The second temperature is between 20°C and 180°C.

18. The method according to any one of claims 13-17, characterized in that, The heating defines a heating zone in which the tube sheet is not heated when the rolled connection insert is heated.

19. The method according to any one of claims 13-18, characterized in that, The heating is performed by at least one of induction, conduction, and convection.

20. The method according to any one of claims 13-19, characterized in that, The cooling is achieved by at least one of conduction, convection, and radiation.

21. The method according to any one of claims 13-20, characterized in that, This includes placing the extracted rolled connection insert into a sealed container.

22. The method according to any one of claims 13-21, characterized in that, include: The reference position is recorded when the removed component is positioned near the rolled connection insert; as well as The tool head is moved a predetermined distance from the reference position to the first position.

Images