Metal cask repair device and repair method

Abstract

To provide a repair method and a device for metal cask capable of easily and inexpensively repairing a flange surface of metal cask in a power plant and a power generation related facility.SOLUTION: A repair device 1 of metal cask comprises: an annular rail 2 which is mounted on a flange surface other than a repair object flange surface, out of multiple flange surfaces 51-53, and is fixed to bolt holes 51b-53b of the flange surface by a bolt 55; an installation rotation member 3 which is bridged in a radial direction of the annular rail 2, and is rotatable around a circumferential direction with a radial center O1 of the annular rail 2 as a center; and a flange surface processing machine 6 which is movable in the radial and axial directions on the installation rotation member 3, and processes the repair object flange surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a repair device and a repair method for a metal cask. [Background technology]

[0002] BACKGROUND ART Conventionally, the method disclosed in Patent Document 1 is known as a method for processing a flange surface of a pipe flange used in a piping connection portion. The processing method of Patent Document 1 involves mounting a pipe flange on a machine tool such as a lathe, and moving a grooving tool from the inner peripheral edge of the flange surface toward the outer peripheral edge while rotating the pipe flange. This processing method allows for the formation of continuous spiral fine grooves (hereinafter referred to as "spiral grooves") at constant depths and at constant intervals in the flange surface. Forming such spiral grooves ensures good sealing properties. It is generally known that if the flange surface of a pipe flange is machined in such a way that machining streaks are formed in the radial direction of the flange surface, good sealing properties cannot be obtained.

[0003] Another known processing machine for processing large flange surfaces is described in Non-Patent Document 1. The processing machine in Non-Patent Document 1 is an inner diameter clamping type and an outer diameter clamping type, and is compatible with containers with large flange surfaces. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-193201 [Non-patent literature]

[0005] [Non-Patent Document 1] FF8200 Flange Facer Operating Manual, Climax Portable Machining & Welding Systems, P / N 59130, Mar. 2019. Summary of the Invention [Problem to be solved by the invention]

[0006] The processing method of Patent Document 1 and the processing machine of Non-Patent Document 1 do not describe a method for repairing scratches on the flange surface of the metal cask. The processing method of Patent Document 1 uses large processing machines installed in a manufacturing factory, and is therefore limited to processing within the manufacturing factory. Therefore, if scratches that impair sealing properties occur on the flange surface of a metal cask in a power plant other than the manufacturing factory or in a power plant-related facility such as a dry storage facility outside the power plant, and the flange surface is repaired using the processing method of Patent Document 1, the metal cask must be returned to the manufacturing factory, which poses a problem of high transportation costs. In this regard, the processing machine of Non-Patent Document 1 can be used for repairs in locations other than manufacturing plants, but because it is designed with a large clamping mechanism, if it is to be applied to repair the flange surface of a metal cask, the entire device will become larger and more difficult to handle.

[0007] The present invention aims to solve the above-mentioned problems and provide a metal cask repair device and repair method that can inexpensively and easily repair the flange surface of a metal cask in power plants, power generation-related facilities, etc. [Means for solving the problem]

[0008] In order to solve the above problem, the metal cask repair device of the present invention is a metal cask repair device having a plurality of stepped flange surfaces for fixing a lid at the opening of the body of the metal cask, and bolt holes for fixing the lid formed in the plurality of flange surfaces, and is characterized in that it comprises: an annular rail that is placed on one of the plurality of flange surfaces other than the flange surface to be repaired and fixed with bolts to the bolt holes in the flange surface; an erection rotating member that is suspended radially across the annular rail and can rotate circumferentially around the radial center of the annular rail; and a flange surface processing machine that is mounted on the erection rotating member and is movable radially and axially of the erection rotating member, and processes the flange surface to be repaired.

[0009] The repair method of the present invention includes a preparation step of placing the annular rail of a metal cask repair device on a flange surface other than the flange surface to be repaired and fixing it with the fixing bolts, attaching the erection rotation member to the annular rail, and applying a processing unit of the flange surface processing machine to the flange surface to be repaired; and driving the flange surface processing machine to apply the processing unit to the flange surface to be repaired. The rotary member rotates at a substantially constant speed along the annular rail due to a driving force generated by the friction between the rotary member and the processed portion, and the flange surface to be repaired is rotated. and a processing step of processing the above. [Effects of the Invention]

[0010] According to the metal cask repair device and repair method of the present invention, the flange surface of a metal cask can be easily repaired in a power plant, a power generation-related facility, or the like. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an enlarged side view of a main part showing a state in which a repair device for a metal cask according to a first embodiment of the present invention is attached to a third flange surface of a metal cask. [Figure 2] 1 is a schematic plan view of a main part showing a state in which a repair device for a metal cask according to a first embodiment of the present invention is attached to a third flange surface of a metal cask. [Figure 3]1 is an enlarged plan view of a main part showing a state in which the repair device for a metal cask according to the first embodiment of the present invention is attached to the third flange surface of the metal cask and the second flange surface is processed. [Figure 4] 1 is an enlarged side view of a main part showing the state when a metal cask repair device according to a first embodiment of the present invention is attached to the first flange surface or the second flange surface of a metal cask and the third flange surface is processed. [Figure 5] 10 is a schematic plan view of a main part showing the structure of an annular rail of a metal cask repair device according to a second embodiment of the present invention. FIG. [Figure 6] FIG. 10 is an enlarged side view of a main part showing a metal cask repair device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each embodiment, the same parts are designated by the same reference numerals, and redundant explanations will be omitted. In the description of each embodiment, "upper" and "lower" refer to the directions shown in FIG. 1.

[0013] (First embodiment) Fig. 1 is an enlarged side view of a main part showing the state in which the metal cask repair device is attached to the third flange surface of the metal cask, and Fig. 2 is a schematic plan view of the main part. As shown in Fig. 1, the metal cask repair device 1 of this embodiment is applied to a metal cask 50 having a plurality of flange surfaces 51-53 provided at its opening, and is used when repairing seal portions 51a-53a of the flange surfaces 51-53 in power plant-related facilities such as dry storage facilities inside the power plant and outside the power plant.

[0014] The metal cask 50 has a cylindrical body 54 with a bottom. A shielding body (not shown) that blocks radiation is embedded in the peripheral wall of the body 54. A storage section (internal space) 54a for storing spent fuel is formed inside the body 54. The storage section 54a is equipped with a basket 54b that holds the spent fuel. A stepped surface that expands in steps from the lower side to the upper side in the axial direction of the body 54 is formed on the upper part of the peripheral wall of the body 54, and each stepped surface forms three flange surfaces 51 to 53.

[0015] The first flange surface 51 at the lower stage is a surface to which a primary lid (not shown) that covers the storage section 54a of the barrel 54 is fixed. A seal portion 51a is formed on the first flange surface 51 to improve airtightness with the primary lid. The second flange surface 52 at the middle stage is a surface to which a secondary lid (not shown) that covers the primary lid is fixed. A seal portion 52a is formed on the second flange surface 52 to improve airtightness with the secondary lid. The third flange surface 53 at the upper stage is a surface to which a tertiary lid (not shown) that covers the secondary lid is fixed. A seal portion 53a is formed on the third flange surface 53 to improve airtightness with the tertiary lid. Each of the seal portions 51a to 53a has a ring shape with a predetermined radial width. The primary lid, secondary lid, and tertiary lid are made of a material such as carbon steel, and seal the upper opening of the barrel 54 to form a sealed boundary during transportation and storage of the metal cask 50.

[0016] As shown in FIG. 1, a metal cask repair device 1 (hereinafter, sometimes simply referred to as "repair device 1") includes an annular rail 2 provided with a rail 2b, a rotary installation member 3, and a flange surface processing machine 6. As shown in FIG. 2, the annular rail 2 is an integrally formed flat ring shape. In this embodiment, the annular rail 2 is for use with a third flange surface 53 and has a diameter and radial width sufficient to allow placement on the third flange surface 53. The annular rail 2 is formed with a plurality of bolt insertion holes 2a at predetermined intervals in the circumferential direction. Each bolt insertion hole 2a is formed corresponding to a plurality of bolt insertion holes 53b (see FIG. 1) formed in the third flange surface 53 for securing a tertiary lid. As a result, the annular rail 2 can be easily fixed to the third flange surface 53 by threading bolts 55 through the bolt insertion holes 2a into the bolt holes 53b, as shown in FIG. 1. The annular rail 2 is not limited to a flat ring shape, and various shapes can be used. The rail 2 b is provided on the upper surface of the circular rail 2 at a position where it does not interfere with the bolts 55 .

[0017] 1 and 2, the rotary installation member 3 is a member that extends in the radial direction of the circular rail 2 and is installed across the circular rail 2. As shown in FIG. 2, the rotary installation member 3 is provided so as to be rotatable in the circumferential direction around the radial center O1 of the circular rail 2. As shown in Fig. 3, the rotary installation member 3 includes a pair of linear rails 3a extending radially, and holding members 3b (only one of which is shown, the same applies below) provided at both radial ends of the linear rails 3a to hold the linear rails 3a at a predetermined distance. Wheels 3c (see Fig. 1) are attached to the lower parts of the holding members 3b so as to run along the rail 2b of the annular rail 2. The rotary installation member 3 is configured to rotate automatically, as described below, by utilizing the frictional force generated when a processing member 6b (described later) of the flange surface processing machine 6 comes into contact with the first flange surface 51 and the second flange surface 52 to be repaired.

[0018] A rectangular frame-shaped guide member 4 is attached to the straight rails 3a, 3a, and a support member 5 that supports a flange surface processing machine 6 is inserted into the hollow portion of the guide member 4. The guide member 4 is movable in the extension direction of the straight rails 3a, 3a, and serves to adjust the position of the flange surface processing machine 6 in the radial direction to a position that corresponds to the flange surface to be repaired among the first flange surface 51 to the third flange surface 53. After the position adjustment, the guide member 4 can be fixed to the straight rails 3a, 3a. The support member 5 is movable in the vertical direction of the guide member 4 and serves to adjust the position of the flange surface processing machine 6 in the vertical direction to a position corresponding to the flange surface to be repaired. The support member 5 can be fixed to the guide member 4 after the position adjustment.

[0019] The flange surface processing machine 6 processes the seal portions 51a to 53a of the first flange surface 51 to the third flange surface 53, and includes an electric motor 6a and a processing member 6b attached to the output shaft of the electric motor 6a. The electric motor 6a is driven to rotate at a predetermined rotational speed by power supplied via a power cord (not shown). The processing member 6b is a polishing member such as a flap wheel for polishing the seal portions 51a to 53b. The width of the processing member 6b is preferably equal to the width of the seal portions 51a to 53a. Here, in addition to a polishing member, the processing member 6b may be a tool for cutting or a grinding wheel. In this case, a mechanism for performing cutting or grinding can be attached to the electric motor 6a as needed.

[0020] Next, a repair method using the metal cask repair device 1 of this embodiment will be described. The repair method includes a preparation process and a processing process. The preparation process is a process of attaching a repair device 1 to a metal cask 50, and includes a first attachment process and a second attachment process. The first attachment process is a process of attaching the repair device 1 when the first flange surface 51 and the second flange surface 52 are to be repaired. On the other hand, the second attachment process is a process of attaching the repair device 1 when the third flange surface 53 is to be repaired. The first attachment process and the second attachment process are selected appropriately according to the flange surface to be repaired. The processing process is a process of processing the flange surface to be repaired using the attached repair device 1. As described above, the repair device 1 includes an annular rail 2, an erected rotating member 3, and a flange surface processing machine 6.

[0021] First, we will explain the installation of the repair device 1 in the first installation step and the processing in the processing step. In the first installation step, as shown in Figures 1 and 3, the annular rail 2 is placed on the third flange surface 53 that is not the repair target, and the processing member 6b of the flange surface processing machine 6 is attached to the first flange surface 51 and the second flange surface 52 that are the repair target.

[0022] Specifically, each bolt insertion hole 2a of the annular rail 2 is aligned with each bolt hole 53b of the third flange surface 53, and the bolts 55 are inserted, and the annular rail 2 is fixed to the third flange surface 53 by tightening each bolt 55. Thereafter, the rotary member 3 is placed on the rail 2b of the circular rail 2, and the rotary member 3 is suspended on the circular rail 2. Then, the guide member 4 is moved radially along the linear rails 3a, 3a, and the support member 5 is moved vertically along the guide member 4, so that the processing member 6b of the flange surface processing machine 6 is adjusted to a position corresponding to, for example, the seal portion 52a of the second flange surface 52. After the position adjustment, the guide member 4 and the support member 5 are fixed so that they cannot move.

[0023] In the processing step, power is supplied to the electric motor 6a of the flange surface processing machine 6, and the processing member 6b grinds the seal portion 52a of the second flange surface 52. When the electric motor 6a is driven to start processing, the friction between the seal portion 52a and the processing member 6b generates a driving force that kicks the seal portion 52a, and this driving force automatically rotates the erected rotating member 3 at a substantially constant speed along the annular rail 2. As a result, the seal portion 52a is processed concentrically over the entire circumferential direction by the processing member 6b. Once processing of the seal portion 52a over the entire circumferential direction is complete, the supply of power is stopped, the support member 5 is released, and the processing member 6b is separated from the seal portion 52a.

[0024] Next, when processing the first flange surface 51, while the annular rail 2 is fixed to the third flange surface 53, the guide member 4 and the support member are adjusted so that the processing member 6b of the flange surface processing machine 6 is positioned corresponding to the seal portion 51a of the first flange surface 51 (shown by the dashed line in Figure 1).

[0025] Thereafter, in the same manner as above, the electric motor 6a of the flange surface processing machine 6 is driven in the processing step to start processing. In this case as well, the frictional force of the processing member 6b against the seal portion 51a generates a driving force that kicks the seal portion 51a, and this driving force automatically rotates the erected rotating member 3 at a substantially constant speed along the annular rail 2. As a result, the seal portion 51a is processed concentrically by the processing member 6b over the entire circumferential direction.

[0026] Once the processing is complete, the support member 5 is released from its fixed position, the electric motor 6a is lifted, and the processing member 6b is separated from the seal portion 51a. Then, the erected rotating member 3 is removed from the annular rail 2, and the bolts 55 are released from the threaded engagement to remove the annular rail 2 from the third flange surface 53. This completes the repair work using the repair device 1.

[0027] Next, the installation of the repair device 1 in the second installation step and the processing in the processing step will be described. In the second installation step, as shown in Fig. 4, the annular rail 2 is fixed to either the first flange surface 51 or the second flange surface 52 with bolts 55. In this case, annular rails 2 of sizes corresponding to the respective diameters are prepared. Then, the guide member 4 and the support member 5 are positioned so that the processing member 6b of the flange surface processing machine 6 is positioned corresponding to the seal portion 53a of the third flange surface 53.

[0028] Then, the electric motor 6a of the flange surface processing machine 6 is driven in the processing step to start processing. In this case, too, a driving force that kicks the seal portion 53a is generated by the frictional force of the processing member 6b against the seal portion 53a, and this driving force automatically rotates the erected rotating member 3 at a substantially constant speed along the annular rail 2. As a result, the seal portion 53a is processed concentrically by the processing member 6b over the entire circumferential direction. In the second installation step, when the annular rail 2 is fixed to the first flange surface 51 with the bolts 55, both the second flange surface 52 and the third flange surface 53 can be the flange surfaces to be repaired. In the second installation step, when the annular rail 2 is fixed to the second flange surface 52 with the bolts 55, both the first flange surface 51 and the third flange surface 53 can be the flange surfaces to be repaired.

[0029] The metal cask repair device 1 of this embodiment described above has a simple configuration and can be easily attached and detached to and from the metal cask 50, making it possible to inexpensively and easily repair the first flange surface 51 to the third flange surface 53 of the metal cask 50 at power plants, power generation-related facilities, etc. Furthermore, since the annular rail 2 can be attached to the first flange surface 51 to the third flange surface 53 using the existing bolt holes 51b to 53b, there is no need to provide a separate structure for attaching the annular rail 2, and a repair device 1 can be obtained that contributes to cost reduction.

[0030] Furthermore, the repair device 1 can suitably repair the seal portion 53a of the third flange surface 53 even when the primary lid is closed in a spent fuel storage facility, which is a facility related to a power plant.

[0031] Furthermore, according to the repair method of this embodiment, the metal cask 50 can be easily attached and detached, and the first flange surface 51 to the third flange surface 53 of the metal cask 50 can be repaired cheaply and easily at power plants, power generation-related facilities, etc.

[0032] Furthermore, according to the repair method of this embodiment, a preparation process including a first mounting process and a second mounting process is included, so that the repair device 1 can be prepared in accordance with the first flange surface 51 to the third flange surface 53 to be repaired, and efficient repair corresponding to the repair object can be achieved.

[0033] (Second embodiment) Next, a metal cask repair device according to a second embodiment will be described with reference to Fig. 5. Fig. 5 is a schematic plan view of the main parts showing the structure of the annular rail of the metal cask repair device according to the second embodiment of the present invention. This embodiment differs from the first embodiment in that the annular rail 2A has a divided structure.

[0034] As shown in Fig. 5, the circular rail 2A is formed by combining (connecting) six circumferentially divided rails 21. The division positions 22 and the number of divisions of the divided rail 21 are not limited to those shown in Fig. 5, but can be set as appropriate. The connecting portions of the divided rails 21 have a comb-tooth structure (not shown), which allows the divided rails 21 to be firmly connected to each other. The connecting portion of the divided rail 21 may have a hinge structure so as to be foldable.

[0035] According to the metal cask repair device 1 of this embodiment described above, the circular rail 2A can be divided into individual split rails 21 and stored when not in use, thereby reducing the storage space required and enabling effective use of space in power plants, power generation-related facilities, etc.

[0036] (Third embodiment) Next, a metal cask repair device according to a third embodiment will be described with reference to Fig. 6. Fig. 6 is an enlarged side view of a main part of the metal cask repair device according to the third embodiment of the present invention. This embodiment differs from the first and second embodiments in that a suction device 30 is provided.

[0037] 6, the suction device 30 includes a suction nozzle 31 and a suction hose 32 connected to the suction nozzle 31. The suction nozzle 31 sucks up chips generated during machining and is disposed in the vicinity of the machined member 6b. The downstream side of the suction hose 32 is connected to a suction fan (not shown) or the like. The suction device 30 as described above creates a negative pressure in the suction nozzle 31 and the suction hose 32 by driving a suction fan or the like to suck in air, thereby sucking in the machining chips around the machined member 6b.

[0038] According to the metal cask repair device 1 of this embodiment described above, the suction device 30 can prevent processing debris generated during processing from scattering or getting mixed into various parts. In particular, it is possible to suitably prevent processing debris from entering the inside of the basket 54b of the metal cask 50 and the bolt holes 51b to 53b. Furthermore, when the seal portion 52a of the second flange surface 52 is processed with the primary lid fixed to the first flange surface 51, it is possible to suitably prevent processing debris from entering the gap portion 51c between the primary lid and the first flange surface 51, etc. Furthermore, it is possible to prevent processing debris from scattering and being mixed into other systems within power generation-related facilities, etc.

[0039] In addition to the suction device 30, or instead of the suction device 30, a cover member for preventing the workpiece from scattering may be provided around the workpiece 6b.

[0040] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and each component can be appropriately modified within the scope of the invention. For example, in each of the above-described embodiments, the installed rotation member 3 automatically rotates along the annular rail 2 by utilizing the frictional force of the processing member 6b, but this is not limited thereto, and the installed rotation member 3 may be configured to rotate by providing a separate drive mechanism. In this case, the installed rotation member 3 can be rotated by using the drive mechanism in the direction opposite to the drive force that kicks the seal portions 51a to 53a as described above. By configuring in this way, the degree of polishing can be adjusted.

[0041] In addition, in each of the above embodiments, the processing member 6b is used to perform concentric polishing or the like on the seal portions 51a to 53a, but this is not limited to this and a spiral groove may be formed. In this case, it is preferable to configure the guide member 4 to move at a predetermined speed relative to the linear rails 3a, 3a so that the spiral groove is automatically formed on the seal portions 51a to 53a. However, the spiral groove may be formed manually. These can be configured similarly when a tool for cutting or a grinding stone for grinding is used as the processing member 6b.

[0042] Furthermore, in each of the above embodiments, the rotary installed member 3 is shown to move along the rail 2b by the wheels 3c, 3c, but this is not limitative and various moving means can be adopted. [Explanation of symbols]

[0043] 1 Repair equipment 2 Circular Rail 2A Circular Rail 3. Erection rotating member 6 Flange surface processing machine 6b Processed material 21 Split Rail 30 Suction device 50 Metal Cask 51 First flange surface (flange surface) 51a~53a Seal part 51b~53b Bolt holes 52 Second flange surface (flange surface) 53 Third flange surface (flange surface) 54 Torso 54a Storage section (internal space) 55 volts O1 Radial center

Claims

1. A metal cask repair device in which a plurality of flange surfaces for fixing a lid are provided in a stepped manner at an opening of a body portion of the metal cask, and bolt holes for fixing the lid are formed in the plurality of flange surfaces, an annular rail that is placed on one of the flange surfaces other than the flange surface to be repaired among the plurality of flange surfaces and is fixed to the flange surface by bolts in the bolt holes of the flange surface; a rotary member that is suspended in a radial direction of the annular rail and is rotatable in a circumferential direction around a radial center of the annular rail; A metal cask repair device characterized by comprising: a flange surface processing machine on the erection rotating member that is movable radially and axially of the erection rotating member and processes the flange surface to be repaired.

2. 2. The metal cask repair device according to claim 1, further comprising a suction device for suctioning chips generated by the processing of the flange surface processing machine.

3. 2. The metal cask repair device according to claim 1, wherein the flange surface processing machine polishes, cuts, or grinds the flange surface to be repaired to form a seal portion on the flange surface to be repaired.

4. 2. The metal cask repair device according to claim 1, wherein the annular rail is constructed by combining divided rails that are divided in the circumferential direction.

5. a preparation step of placing the annular rail of the metal cask repair device according to any one of claims 1 to 4 on a flange surface other than the flange surface to be repaired and fixing it with the bolts, attaching the erection rotating member to the annular rail, and applying the processing part of the flange surface processing machine to the flange surface to be repaired; a processing step of processing the flange surface to be repaired by driving the flange surface processing machine and rotating the erected rotating member at an approximately constant speed along the annular rail due to a driving force generated by the frictional force between the flange surface to be repaired and the processing portion.

6. 6. The repair method according to claim 5, The plurality of flange surfaces include: a first flange surface to which a primary lid that covers an internal space of the metal cask is fixed, a second flange surface to which a secondary lid that covers the primary lid is fixed, and a third flange surface to which a tertiary lid that covers the secondary lid is fixed, The preparation step includes: a first mounting step of fixing the annular rail to the third flange surface with the bolts and processing at least one of the first flange surface and the second flange surface with the flange surface processing machine; a second installation step of fixing the annular rail to the first flange surface or the second flange surface with the bolts and processing the third flange surface with the flange surface processing machine.

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