JP2010101667A - Refueling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refueling machine with which working hours required for refueling are shortened and the damage to linear members suspending tubular members are restrained. <P>SOLUTION: An expansion pipe 14 is composed by combining tubular members 1a to 1e so that they can expand and contract freely. A fuel gripper 15 and the tubular member 1e are suspended by wire ropes 21A and 21B wound around drums 19A and 19B of a winding device 16. Tubular member moving devices 30 are mounted on the tubular members 1b, 1c and 1d. Each of the tubular member moving devices 30 is placed through an opening formed on first gears 5 which are mounted on the inner face of one of the tubular members and engages with racks formed on the outer faces of the other tubular members adjoining inside the one tubular member, second gears 5 which are mounted on the outer face of the one of the tubular members and engages with racks formed on the inner faces of the other tubular members adjoining outside the one tubular member and the one of the tubular members and has a belt 7 for conveying the revolution of the first gears 5 to the second gears 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel exchanger, and more particularly to a fuel exchanger suitable for application to a boiling water nuclear power plant.

  In general, a boiling water nuclear power plant is provided with a fuel exchanger that runs along a reactor well and a fuel storage pool. The refueling machine is disposed across the reactor well and the fuel storage pool, and travels on a rail installed on the operation floor, installed on a rail provided on the traveling truck, and the moving direction of the traveling truck A traversing cart that moves in an orthogonal direction, and a fuel gripping device installed in the traversing cart are provided. Such a refueling machine is configured to grip a fuel assembly or blade guide with a fuel gripping device, load the fuel assembly or blade guide onto a core in a reactor pressure vessel by moving each carriage, and a fuel assembly in the core. Used to remove the body or blade guide from the reactor pressure vessel.

  A fuel gripping device includes a telescopic tube (mast) in which a plurality of tubular members are combined with each other so as to freely expand and contract, a fuel gripping tool for gripping a fuel assembly or a blade guide provided at the lower end of the telescopic tube, And a winding device for extending and retracting the telescopic tube in the vertical direction by winding and unwinding the wire rope.

  The telescopic tube combines a plurality of cylindrical tubular members having different diameters so that they can be expanded and contracted. Each tubular member is provided with a retaining projection (hereinafter referred to as a stopper) at the upper and lower ends so that the tubular member does not fall off from adjacent tubular members, or the upper tubular member can pull up the lower tubular member. . The telescopic tube needs to be expanded and contracted by a winder when going to grip the fuel assembly and when lowering the gripped fuel assembly. When the retracting operation of the winding device is rapid, there is a possibility that the stopper is damaged due to an impact applied to the stopper. For this reason, the expansion / contraction operation | movement of the expansion-contraction tube by a winding device is made slow.

  Each of the fuel changers described in JP-A-7-181288, JP-A-10-132986, and JP-A-2007-10532 prevents damage to the stopper of each tubular member, and moves the expansion and contraction tube up and down. It solves the problem of speed.

  A fuel gripping device for a fuel changer described in Japanese Patent Laid-Open No. 7-181288 moves each tubular member of an expansion / contraction tube up and down without using a stopper in order to eliminate slackness and handle a fuel collecting tube quickly. It has a configuration. This fuel gripping device has a configuration in which a wire rope is connected to each tubular member, and each wire rope is wound or unwound by each drum having a different diameter of the winding drum provided in the winding device. Each tubular member of the telescopic tube has a different vertical moving speed.

  A fuel gripping device for a fuel changer described in Japanese Patent Application Laid-Open No. 10-132986 has a pulley attached to the upper end and lower end of each tubular member constituting an expansion tube, and is wound around a take-up drum of a take-up device. One rope is continuously stretched over the pulleys at the upper end and the lower end of each tubular member. Further, the second rope for raising and lowering the fuel grip provided at the lower end portion of the tubular member positioned at the lower end of the telescopic tube is wound and rewound by the winding drum of the winding device.

  A fuel gripping device for a fuel changer described in Japanese Patent Application Laid-Open No. 2007-10532 includes a rotating body attached to the upper end portion of each tubular member of an expansion tube, and a first rope hooked on the rotating body of the first tubular member. A second tubular member located adjacent to the outside of the first tubular member, and a third tubular member located adjacent to the inside of the first tubular member, and attached to the first tubular member. The attached second rope is wound around the winding drum of the winding device.

Japanese Patent Laid-Open No. 7-181288 JP-A-10-132986 JP 2007-10532 A

  In the fuel changer described in Japanese Patent Application Laid-Open No. 7-181288, the winding device has a winding drum having a plurality of drums having different diameters, and an impact is generated due to a collision between stoppers provided on each tubular member. There are few, and the raising / lowering speed of a tubular member can be made quick. However, it is necessary to attach a wire rope to each tubular member, and all these wire ropes must be wound and unwound by a winding drum. In this way, a large load is applied to the rotating shaft of the winding drum due to the winding of many wire ropes. In the fuel changer described in JP-A-7-181288, it is necessary to accurately manufacture the diameter of each drum so that each tubular member descends to a predetermined position when the telescopic tube is extended.

  In the fuel changer described in JP-A-10-132986, since it is hooked on pulleys provided at the lower end and upper end of each tubular member, there are many wire ropes with the weight of each tubular member added. It is bent in times. For this reason, since the wire rope hooked by the pulley is arrange | positioned between adjacent tubular members, the tubular member which moves up and down may contact the wire rope arrange | positioned between tubular members. The wire rope that suspends the tubular member is damaged by the tubular member that moves up and down, and the life of the wire rope is shortened. The fuel changer described in Japanese Patent Application Laid-Open No. 10-132986 improves the stopper part to a mechanical damper or a magnetic damper made of a permanent magnet and an electromagnet, and absorbs an impact caused by contact between the stoppers. This is because a damper function is attached to the tubular member, and damage to this part is easily assumed.

  The fuel changer described in Japanese Patent Application Laid-Open No. 2007-10532 is disclosed in Japanese Patent Application Laid-Open No. 10-132986 among the above-mentioned problems in the fuel changers disclosed in Japanese Patent Application Laid-Open Nos. 7-181288 and 10-132986. Problems other than damage to the rope that suspends the resulting tubular member can be eliminated.

  In the fuel changer described in Japanese Patent Application Laid-Open No. 2007-10532, two tubular members adjacent to each other inside and outside of one tubular member are suspended by a rope hooked on a rotating body provided on the former tubular member. Since it has the structure which was made, the rope hooked by the rotary body is arrange | positioned between adjacent tubular members. For this reason, although the structure hooked on the rotating body is different, in the fuel changer disclosed in Japanese Patent Application Laid-Open No. 2007-10532, as with the fuel changer disclosed in Japanese Patent Application Laid-Open No. 10-132986, Each rope suspending the tubular member can be damaged. Furthermore, in the fuel changer disclosed in Japanese Patent Application Laid-Open No. 2007-10532, a rotating body that is provided at the upper end of a tubular member and suspends a rope can come into contact with an adjacent tubular member when the tubular member moves up and down. There is sex. When the rotating body comes into contact with the tubular member, the rotating body cannot be rotated, and the vertical movement of the tubular member is hindered.

  An object of the present invention is to provide a refueling machine that can shorten the work time required for refueling and can suppress damage to a linear member that suspends a tubular member.

The feature of the present invention that achieves the above-described object is that it is disposed between the innermost tubular member among the plurality of tubular members included in the telescopic mast and the outermost tubular member among the plurality of tubular members. A tubular member moving device that is provided for each of the other plurality of tubular members and moves the other tubular member in the axial direction of the telescopic mast;
A tubular member moving device is attached to the inner surface of the first tubular member to be moved, and is formed on the outer surface of the second tubular member disposed inside the first tubular member and adjacent to the first tubular member. A first gear meshing with the first rack, and a third gear mounted on the outer surface of the first tubular member and disposed outside the first tubular member and adjacent to the first tubular member. A second gear meshing with a second rack formed on the inner surface of the tubular member, and an endless body that transmits the rotation of the first gear to the second gear through the opening formed in the first tubular member. There is in doing.

  The axial movement of the innermost tubular member by the winding device is provided to each of a plurality of other tubular members located between the innermost tubular member and the outermost tubular member. These other tubular members are moved in parallel in the axial direction as transmitted by the tubular member moving device. That is, the first gear attached to the inner surface of the first tubular member adjacent to the outer side of the innermost tubular member is the innermost tubular member formed on the outer surface with the first rack meshing with the first gear. It rotates by moving in the axial direction. The rotation of the first gear is attached to the outer surface of the first tubular member by meshing with the second rack formed on the inner surface of the third tubular member adjacent to the outside of the first tubular member by the endless body. The second gear is rotated. By the rotation of the second gear, the first tubular member moves in the moving direction of the innermost tubular member that is the second tubular member. The movement of the first tubular member in the axial direction is performed on the outer side of the first tubular member by the other tubular member moving device provided on the tubular member adjacent to the first tubular member on the outside (the third tubular member). To the adjacent tubular member, and this tubular member also moves in the moving direction of the innermost tubular member.

  As described above, since the plurality of other tubular members described above are moved in parallel by the tubular member moving devices provided respectively, the fuel gripper can be moved faster in the axial direction of the telescopic mast. Can do. For this reason, according to the present invention, the time required for the replacement operation of the fuel assembly can be shortened.

  In addition, since the plurality of other tubular members described above are moved by each tubular member moving device, the first linear member that suspends the innermost tubular member does not come into contact with the other tubular members. For this reason, the first linear member is not damaged from other tubular members.

  ADVANTAGE OF THE INVENTION According to this invention, the working time required for fuel replacement | exchange can be shortened and damage to the linear member which suspends a tubular member can be suppressed.

  Examples of the present invention will be described below.

  A fuel changer which is a preferred embodiment of the present invention will be described with reference to FIGS. The fuel changer 10 of the present embodiment includes a traveling carriage 11. A traverse carriage 12, a fuel gripping device 13 and a winding device 16 are provided. The refueling machine 10 is disposed in a reactor building (not shown) of a boiling water nuclear plant. A reactor well 28 and a fuel storage pool 29 surrounded by an operation floor 27 are formed in the reactor building. The traveling carriage 11 is disposed on a pair of rails 23 installed on the operation floor 27 in the reactor building so that the traveling carriage 11 can travel across the reactor well 28 and the fuel storage pool 29. The traversing carriage 12 is disposed on a pair of rails 24 provided on the traveling carriage 11 and is moved in a direction orthogonal to the moving direction of the traveling carriage 11. A fuel gripping device 13 and a winding device 16 are installed on the traversing carriage 12.

  The fuel gripping device 13 includes a telescopic tube (mast) 14, a fuel gripping tool 15, and a plurality of tubular member moving devices 30. The telescopic tube 14 has a plurality of tubular members (tubular bodies) 1, that is, tubular members 1a, 1b, 1c, 1d and 1e. The tubular members 1a, 1b, 1c, 1d and 1e have different outer diameters and are arranged concentrically. The tubular members 1a, 1b, 1c, 1d and 1e are arranged in this order from the outside toward the inside. A stopper member 2A protruding outward and inward is provided at the lower end of the tubular members 1a, 1b, 1c, 1d and 1e, and the upper and lower ends of the tubular members 1a, 1b, 1c, 1d and 1e are also outward and inward. A protruding stopper member 2B is provided. The plurality of tubular members 1 are combined so as to be telescopically telescopic. An outermost tubular member 1 a is attached to the traversing carriage 12. The fuel gripping tool 15 is installed at the lower end of the tubular member 1e located on the innermost side, that is, when the telescopic tube 14 is extended, the tubular member 1e located on the lowermost side.

  As shown in FIGS. 3 and 4, the tubular member moving device 30 includes a pair of gears 5, a pair of racks 6, and an endless belt 7. As the tubular member moving device 30, tubular member moving devices 30a, 30b, 30c, 30d, 30e and 30f are provided. The tubular member moving device 30a provided on the tubular member 1b includes gears 5a and 5b, racks 6a and 6b, and a belt 7a. The rack 6a is formed on the inner surface of the tubular member 1a adjacent to the tubular member 1b on the outside, and the rack 6b is formed on the outer surface of the tubular member 1c adjacent to the adjacent tubular member 6b on the inside. The racks 6a and 6b extend from the lower ends of the tubular members 1a and 1c toward the upper end in the axial direction of the tubular members. A gear 5a is rotatably installed at the upper end on the outer surface of the tubular member 1b and meshes with the rack 6a. The gear 5b is rotatably installed at the lower end on the inner surface of the tubular member 1b and meshes with the rack 6b. The tubular member 1b is formed with an elongated opening 31a extending in the axial direction. The belt 7a passes through the opening 31a, and is hung on the rotating shaft (second rotating body) of the gear 5a and the rotating shaft (first rotating body) of the gear 5b.

  The tubular member moving device 30b provided on the tubular member 1c includes gears 5c and 5d, racks 6c and 6d, and a belt 7b. The rack 6c is formed on the inner surface of the tubular member 1b adjacent to the tubular member 1c on the outside, and the rack 6d is formed on the outer surface of the tubular member 1d adjacent to the tubular member 1c on the inside. The racks 6c and 6d extend from the lower ends of the tubular members 1b and 1d toward the upper end in the axial direction of the tubular members. A gear 5c is rotatably installed at the upper end on the outer surface of the tubular member 1c and meshes with the rack 6c. A gear 5d is rotatably installed at the lower end on the inner surface of the tubular member 1c and meshes with the rack 6d. The tubular member 1c is formed with an elongated opening 31b extending in the axial direction. The belt 7b passes through the opening 31b, and is hung on the rotating shaft (second rotating body) of the gear 5c and the rotating shaft (first rotating body) of the gear 5d.

  The tubular member moving device 30c provided on the tubular member 1d includes gears 5e and 5f, racks 6e and 6f, and a belt 7c. The rack 6e is formed on the inner surface of the tubular member 1c adjacent to the tubular member 1d on the outside, and the rack 6f is formed on the outer surface of the tubular member 1e adjacent to the tubular member 1d on the inside. The racks 6e and 6f extend from the lower ends of the tubular members 1c and 1e toward the upper end in the axial direction of the tubular members. A gear 5e is rotatably installed at the upper end on the outer surface of the tubular member 1d and meshes with the rack 6e. A gear 5f is rotatably installed at the lower end on the inner surface of the tubular member 1d and meshes with the rack 6f. The tubular member 1d is formed with an elongated opening 31c extending in the axial direction. The belt 7c passes through the opening 31c, and is hung on the rotating shaft (second rotating body) of the gear 5e and the rotating shaft (first rotating body) of the gear 5f (see FIG. 5).

  A tubular member moving device 30d provided on the tubular member 1b is disposed at a position 180 ° opposite to the tubular member moving device 30a. The tubular member moving device 30d includes gears 5g and 5h, racks 6g and 6h, and a belt 7d. The rack 6g is formed on the inner surface of the tubular member 1a, and the rack 6h is formed on the outer surface of the tubular member 1c. The racks 6g and 6h extend from the lower ends of the tubular members 1a and 1c toward the upper end in the axial direction of the tubular members. A gear 5g is rotatably installed at the upper end on the outer surface of the tubular member 1b and meshes with the rack 6g. A gear 5h is rotatably installed at the lower end on the inner surface of the tubular member 1b and meshes with the rack 6h. In the tubular member 1b, an elongated opening 31d extending in the axial direction is formed at a position 180 ° opposite to the opening 31a. The belt 7d passes through the opening 31d, and is hung on the rotating shaft (second rotating body) of the gear 5g and the rotating shaft (first rotating body) of the gear 5h.

  A tubular member moving device 30e provided on the tubular member 1c is arranged at a position 180 ° opposite to the tubular member moving device 30b. The tubular member moving device 30e includes gears 5i and 5j, racks 6i and 6j, and a belt 7e. The rack 6i is formed on the inner surface of the tubular member 1b, and the rack 6j is formed on the outer surface of the tubular member 1d. The racks 6i and 6j extend from the lower ends of the tubular members 1b and 1d toward the upper end in the axial direction of the tubular members. A gear 5i is rotatably installed at the upper end on the outer surface of the tubular member 1c and meshes with the rack 6i. A gear 5j is rotatably installed at the lower end on the inner surface of the tubular member 1c and meshes with the rack 6j. In the tubular member 1c, an elongated opening 31e extending in the axial direction is formed at a position 180 ° opposite to the opening 31b. The belt 7e passes through the opening 31e, and is hung on the rotating shaft (second rotating body) of the gear 5i and the rotating shaft (first rotating body) of the gear 5j.

  A tubular member moving device 30f provided in the tubular member 1d is disposed at a position 180 ° opposite to the tubular member moving device 30c. The tubular member moving device 30f includes gears 5k and 5l, racks 6k and 6l, and a belt 7f. The rack 6k is formed on the inner surface of the tubular member 1c, and the rack 6l is formed on the outer surface of the tubular member 1e. The racks 6k and 6l extend from the lower ends of the tubular members 1c and 1e toward the upper end in the axial direction of the tubular members. A gear 5k is rotatably installed at the upper end on the outer surface of the tubular member 1d and meshes with the rack 6k. A gear 5l is rotatably installed at the lower end on the inner surface of the tubular member 1d and meshes with the rack 6l. In the tubular member 1d, an elongated opening 31f extending in the axial direction is formed at a position 180 ° opposite to the opening 31c. The belt 7f passes through the opening 31f, and is hung on the rotation shaft (second rotation body) of the gear 5k and the rotation shaft (first rotation body) of the gear 5l.

  The winding device 16 includes a driving device (motor) 18, a winding drum 19, a rotating shaft 20, wire ropes 21 </ b> A and 21 </ b> B, and a control device 22. A driving device 18 is installed in the traversing carriage 12, and drums 19 </ b> A and 19 </ b> B of the winding drum 19 are attached to a rotating shaft 20 connected to the driving device 18. The diameters of the drums 19A and 19B are the same. The wire rope 21 </ b> A is wound around the drum 19 </ b> A and attached to the fuel gripping tool 15. The wire rope 21B is wound around the drum 19B and is attached to the upper end of the tubular member 1e located on the innermost side.

  The replacement of the fuel assembly using the fuel exchanger 10 is performed during a periodic inspection period after the operation of the boiling water nuclear plant is stopped. The reactor pressure vessel 25 and a reactor containment vessel (not shown) surrounding the reactor pressure vessel 25 are installed in the reactor building. After the operation of the boiling water nuclear power plant is stopped, the reactor well 28 located above the reactor containment vessel is filled with cooling water. Thereafter, the lid of the reactor containment vessel and the lid of the reactor pressure vessel 25 are removed. A steam dryer, a steam separator and a shroud head installed in the reactor pressure vessel 25 are carried out of the reactor pressure vessel 25.

  A plurality of fuel assemblies (spent fuel assemblies) having reached the end of their life loaded in the reactor core in the reactor pressure vessel 25 are taken out from the reactor core, transferred to the fuel storage pool 29, and stored in the fuel storage pool 29. The same number of new fuel assemblies that are stored are loaded into the core. For example, 1/4 of the fuel assemblies in the core are replaced with new fuel assemblies. The fuel changer 10 is used to transfer such spent fuel assemblies and new fuel assemblies.

  The fuel change using the fuel changer 10 will be described below. The traveling carriage 11 is positioned above the reactor well 28 and the traveling carriage 11 and the traversing carriage 12 are allowed to travel so that the fuel gripping tool 15 is loaded in the reactor core and positioned directly above the fuel assembly 26 to be taken out. The The driving device 18 is driven to rotate the rotating shaft 20 to rotate the drums 19A and 19B. The wire rope 21A wound around the drum 19A and the wire rope 21B wound around the drum 19B are rewound, and the tubular member 1e and the fuel gripping tool 15 are lowered. As the tubular member 1e descends, the telescopic tube 14 is extended downward as described later. The fuel grip 15 is lowered to the position of the handle of the fuel assembly 26, and the handle is gripped by the hook of the fuel grip 15. Thereafter, the driving device 18 is reversely rotated and the wire ropes 21A and 21B are wound around the drums 19A and 19B, respectively. The tubular member 1 e and the fuel gripping tool 15 are raised, and the fuel assembly 26 suspended from the hook of the fuel gripping tool 15 is taken out from the core and reaches the reactor well 28.

  When the fuel assembly 26 reaches a predetermined height, the drive unit 18 is stopped and the traveling carriage 11 is moved toward the fuel storage pool 29. The traveling carriage 11 and the traversing carriage 12 are moved, and the fuel assembly 26 suspended from the fuel gripping tool 15 is moved to a predetermined storage position of a fuel storage rack (not shown) installed in the fuel storage pool 29. Move to just above. The drive device 18 is driven to rewind the wire ropes 21A and 21B from the drums 19A and 19B, and the fuel grip 15 is lowered toward the fuel storage rack. When the fuel assembly 26 is stored in a predetermined position of the fuel storage rack, the driving device 18 is stopped and the fuel assembly 26 is removed from the hook of the fuel gripper 15.

  The fuel grip 15 is moved to a position just above the new fuel assembly housed in another fuel storage rack, and grips the new fuel assembly 26. The new fuel assembly 26 pulled up from the fuel storage rack by the winding device 16 is transferred from the fuel storage pool 29 to the reactor well 28 by moving the traveling carriage 11 and the traverse carriage 12. The drive device 18 is driven to rotate the drums 19A and 19B, and the wire ropes 21A and 21B are rewound. The telescopic tube 14 is extended and the fuel gripping tool 15 is lowered. The new fuel assembly 26 is loaded at a predetermined position in the core.

  When the spent fuel assembly 26 existing in the core is gripped by the fuel gripping tool 15 and when the spent fuel assembly 26 is lowered into the fuel storage rack, the operation of extending the telescopic tube 14 is performed. This will be described in detail.

  When the wire ropes 21A and 21B are rewound from the drums 19A and 19B by driving the driving device 18, the tubular member 1e is lowered by its own weight. The lowering of the tubular member 1e rotates the gear 5f that meshes with the rack 6f and the gear 5l that meshes with the rack 6l. The rotation of the gear 5f is transmitted to the gear 5e by the belt 7c, and the gear 5e is rotated. Since the rotating gear 5e meshes with the rack 6e formed inside the tubular member 1c, the rotating gear 5e moves to the lower end of the rack 6e. The rotation of the gear 5l is transmitted to the gear 5k by the belt 7f, and the gear 5k is rotated. Since the rotating gear 5k meshes with the rack 6k formed inside the tubular member 1c, it moves to the lower end of the rack 6k. The tubular member 1d is lowered by the movement of the gears 5e and 5k toward the lower ends of the racks 6e and 6k.

  The lowering of the tubular member 1d rotates the gear 5d that meshes with the rack 6d and the gear 5j that meshes with the rack 6j. The rotation of the gear 5d is transmitted to the gear 5c by the belt 7b, and the gear 5c is rotated. Since the rotating gear 5c meshes with the rack 6c formed inside the tubular member 1b, it moves to the lower end of the rack 6c. The rotation of the gear 5j is transmitted to the gear 5i by the belt 7e, and the gear 5i is rotated. Since the rotating gear 5i meshes with the rack 6i formed inside the tubular member 1b, it moves to the lower end portion of the rack 6i. The tubular member 1c is lowered by the movement of the gears 5c and 5i toward the lower ends of the racks 6c and 6i.

  The lowering of the tubular member 1c rotates the gear 5b that meshes with the rack 6b and the gear 5h that meshes with the rack 6h. The rotation of the gear 5b is transmitted to the gear 5a by the belt 7a, and the gear 5a is rotated. Since the rotating gear 5a meshes with the rack 6a formed inside the tubular member 1a, the rotating gear 5a moves to the lower end of the rack 6a. The rotation of the gear 5h is transmitted to the gear 5g by the belt 7d, and the gear 5g is rotated. Since the rotating gear 5g meshes with the rack 6g formed inside the tubular member 1a, it moves to the lower end of the rack 6g. The tubular member 1b is lowered by the movement of the gears 5a and 5g toward the lower ends of the racks 6a and 6g.

  As described above, when the tubular member 1e is lowered, the tubular member 1d is lowered by the tubular member moving devices 30c and 30f, the tubular member 1c is lowered by the tubular member moving devices 30b and 30e, and is moved by the tubular member moving devices 30a and 30d. The tubular member 1b is lowered. The lowering of the tubular members 1d, 1c and 1b is performed in parallel with the lowering of the tubular member 1e. When the telescopic tube 14 is extended to the maximum, that is, when the tubular member 1e is lowered to the lowest position, the gear 5e contacts the upper surface of a protrusion (not shown) provided at the lower end of the rack 6e, and the gear 5k. Contacts the upper surface of a protrusion (not shown) provided at the lower end of the rack 6k, the gear 5c contacts the upper surface of the protrusion (not shown) provided at the lower end of the rack 6c, and the gear 5i. Contacts the upper surface of a protrusion (not shown) provided at the lower end of the rack 6i. Further, the gear 5a contacts the upper surface of a protrusion (not shown) provided at the lower end of the rack 6a, and the gear 5g contacts the upper surface of the protrusion (not shown) provided at the lower end of the rack 6g. To do. For this reason, the tubular member 1b is supported by the tubular member 1a, the tubular member 1c is supported by the tubular member 1b, and the tubular member 1d is supported by the tubular member 1c.

  The operation of contracting the telescopic tube 14 when the spent fuel assembly 26 existing in the core is lifted by the fuel gripping tool 15 and when the new fuel assembly is lifted from the fuel storage rack will be described below.

  By driving the drive device 18 in the reverse direction, the wire ropes 21A and 21B are wound around the drums 19A and 19B, and the tubular member 1e is pulled up. The gears 5f and 5l rotate in the direction opposite to that when the tubular member 1e is lowered. The gear 5e rotated by the belt 7c moves to the upper end of the rack 6e. The gear 5k rotated by the belt 7f moves to the upper end of the rack 6k. As the gears 5e and 5k move toward the upper ends of the racks 6e and 6k, the tubular member 1d rises.

  The raising of the tubular member 1d causes the gears 5d and 5j to rotate in the direction opposite to that when the tubular member 1d is lowered. The gear 5c rotated by the belt 7b moves to the upper end of the rack 6c. The gear 5i rotated by the belt 7e moves to the upper end of the rack 6i. As the gears 5c and 5i move toward the upper ends of the racks 6c and 6i, the tubular member 1c rises.

  The raising of the tubular member 1c causes the gears 5b and 5h to rotate in the direction opposite to that when the tubular member 1c is lowered. The gear 5a rotated by the belt 7a moves to the upper end of the rack 6a. The gear 5g rotated by the belt 7d moves to the upper end of the rack 6g. As the gears 5a and 5g move toward the upper ends of the racks 6a and 6g, the tubular member 1b rises.

  As described above, when the tubular member 1e is raised, the tubular member 1d is raised by the tubular member moving devices 30c and 30f, the tubular member 1c is raised by the tubular member moving devices 30b and 30e, and is moved by the tubular member moving devices 30a and 30d. The tubular member 1b is raised. The raising of the tubular members 1d, 1c and 1b is performed almost simultaneously with the raising of the tubular member 1e. When the telescopic tube 14 is contracted most, that is, when the tubular member 1e is raised to the uppermost position, the portion of the tubular member 1d that protrudes to the inside of the stopper member 2A is the portion of the tubular member 1e that protrudes to the outside of the stopper member 2A. The portion of the tubular member 1c that protrudes to the inside of the stopper member 2A is supported by the portion of the tubular member 1d that protrudes to the outside of the stopper member 2A, and the portion of the tubular member 1b that protrudes to the inside of the stopper member 2A is the tubular member It is supported by the part which protrudes outside the stopper member 2A of 1c.

  The tubular member moving devices 30a and 30d are arranged at positions different from the tubular member moving devices 30b and 30e in the circumferential direction of the tubular member. The tubular member moving devices 30c and 30f are arranged at positions different from the tubular member moving devices 30a and 30d and the tubular member moving devices 30b and 30e in the circumferential direction of the tubular member. By such an arrangement of the tubular member moving device 30, it is possible to avoid interference between the rack and the gear meshing with the rack between combinations of different tubular member moving devices 30.

  In this embodiment, when the fuel gripping tool 15 is lowered by the movement of the tubular member 1e positioned at the lowest position by the winding device 16, and when it is raised, the other tubular members 1b, 1c, 1d The tubular member moving device 30 can be lowered in parallel with the movement of the tubular member 1e and further raised in parallel. For this reason, the fuel grip 15 can be lowered more quickly and can be further raised. By using the fuel changer 10, the time required for the replacement operation of the fuel assembly 26 can be shortened.

  Since the fuel changer 10 suspends the tubular member with one wire rope 21B, the load applied to the rotating shaft 20 is smaller than that of the fuel changer described in Japanese Patent Application Laid-Open No. 7-181288, and a driving device (motor). The capacity of 18 can be reduced.

  In this embodiment, as disclosed in JP-A-10-132986 and JP-A-2007-10532, the wire rope 21B for suspending the tubular member is not disposed between the adjacent tubular members 1, so that the wire rope 21B moves up and down. The tubular member 1 is not damaged. Therefore, the life of the wire rope 21B is also extended.

  In this embodiment, the gap in the radial direction between the adjacent tubular members 1 is held at an interval set by the gear 5 of the tubular member moving device 30 that moves the tubular member 1 up and down, and the belt 7 of the tubular member moving device 30. Is applied to the rotating shaft of the gear 5, which is smaller than the diameter of the gear, so that the belt 7 does not contact the tubular member 1 that moves up and down and is not damaged by the tubular member 1.

  Since each tubular member 1 is provided with the tubular member moving device 30 on the opposite side to 180 °, the tubular member 1 can be smoothly moved in the axial direction. For example, the tubular member 1d is provided with tubular member moving devices 30c and 30f on opposite sides of 180 °.

  In the present embodiment, racks are not formed on the upper and lower ends of each tubular member, as shown in FIG. For this reason, the rotation of the gears provided on the tubular members is stopped at the upper and lower ends of the rack, and collision between the stopper members of adjacent tubular members is avoided. In this embodiment, the stopper member is not damaged by the collision between the stopper members.

  The belt 7 of the tubular member moving device 30 may be replaced with an endless chain. In this case, a sprocket having a diameter smaller than that of the gear 5 is provided on the rotation shaft of the gear 5 of the tubular member moving device 30 and meshes with the chain.

  A fuel changer which is another embodiment of the present invention will be described with reference to FIG. The fuel changer 10A of the present embodiment has a configuration in which the expansion tube 14 is replaced with the expansion tube 14A in the fuel changer 1 of the first embodiment. The other configuration of the fuel exchanger 10A is the same as that of the fuel exchanger 10. The telescopic tube 14A of the fuel exchanger 10A includes tubular members 1a to 1e having a shape obtained by removing the stopper members 2A and 2B from all of the tubular members 1a to 1e in the telescopic tube 14 of the fuel exchanger 1.

  A rack 6 extending in the axial direction that meshes with the gear 5 of the tubular member moving device 30 is formed by cutting the tubular members 1a to 1e of the telescopic tube 14A. For this reason, when the tubular member 1 e is lowered and raised, the gear 5 can move only on the rack 6 cut into the tubular member 1, and it is mechanically impossible to overrun from the rack 6. Therefore, the stopper members 2A and 2B can be removed from each tubular member 1, and the telescopic tube 14A can be simplified.

  The fuel changer 10 </ b> A of the present embodiment can obtain each effect generated in the fuel changer 10.

It is a front view of the fuel change machine of Example 1 which is one suitable example of the present invention. It is a top view of the refueling machine shown in FIG. It is a longitudinal cross-sectional view of the fuel gripping device of the fuel changer shown in FIG. It is a cross-sectional view of the expansion-contraction pipe | tube of the fuel grasping apparatus shown in FIG. It is VV sectional drawing of FIG. It is a longitudinal cross-sectional view in the state where the expansion-contraction tube of the fuel gripping device was extended. It is a longitudinal cross-sectional view of the expansion-contraction pipe | tube in the fuel exchanger of Example 2 which is another Example of this invention.

Explanation of symbols

  1a, 1b, 1c, 1d, 1e ... tubular members, 5, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5j, 5k, 5l ... gears, 6, 6a, 6b, 6c, 6d , 6e, 6f, 6g, 6h, 6i, 6j, 6k, 6l ... rack, 7, 7a, 7b, 7c, 7d, 7e, 7f ... belt, 10, 10A ... fuel changer, 11 ... traveling carriage, 12 ... traversing Dolly, 13 ... Fuel gripping device, 14 ... Telescopic tube, 15 ... Fuel gripper, 16 ... Winding device, 18 ... Drive device, 19 ... Winding drum, 21A, 21B ... Wire rope, 25 ... Reactor pressure vessel, 26 ... Fuel assembly, 28 ... Reactor well, 29 ... Fuel storage pool, 30, 30a, 30b, 30c, 30d, 30e, 30f ... Tubular member moving device, 31, 31a, 31b, 31c, 31d, 31e, 31f ... opening .

Claims (4)

A traveling carriage; a traversing carriage that moves on the traveling carriage; a telescopic mast that is installed on the traversing carriage and extends downward; and a plurality of tubular members that are elastically combined with each other; A fuel grip provided at a lower end of the tubular member located on the innermost side of the member, a first linear member installed on the traverse carriage and attached to the tubular member located on the innermost side; and A winding device that winds the second linear member attached to the fuel gripper and moves the first tubular member and the fuel gripper in the axial direction of the telescopic mast, and the most of the plurality of tubular members Provided for each of the other plurality of tubular members disposed between the tubular member located on the inner side and the tubular member located on the outermost side among the plurality of tubular members, And a tubular member moving device for moving the serial direction,
The tubular member moving device is attached to the inner surface of the first tubular member to be moved, and is disposed inside the first tubular member and adjacent to the first tubular member. A first gear meshing with a first rack formed on the outer surface of the member; and attached to the outer surface of the first tubular member and disposed on the outer side of the first tubular member, the first tubular member The second gear that meshes with the second rack formed on the inner surface of the third tubular member adjacent to the first tubular member, and the opening formed in the first tubular member to rotate the first gear. An endless body for transmitting to the second gear.   The endless body is applied to a first rotating body provided in the first gear smaller than an outer diameter of the first gear and a second rotating body provided in the second gear smaller than an outer diameter of the second gear. The refueling machine as claimed in claim 1.   The openings are formed in the other tubular members at positions substantially 180 ° apart in the circumferential direction, and the other tubular members are respectively arranged at positions where the tubular member moving device is substantially 180 ° apart in the circumferential direction. The refueling machine according to claim 1 or 2, which is disposed in the area.   The refueling machine according to any one of claims 1 to 3, wherein the tubular member moving device is arranged at a different position in the circumferential direction in the other adjacent tubular members.

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