JP2017159988A - Storage can conveying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage can conveying system that can convey storage cans without impairing sealability of the storage cans and without disturbing work just above the storage cans.SOLUTION: The storage can conveying system comprises a storage can lifting mechanism 2 that moves up and down storage cans 101. The storage can lifting mechanism 2 comprises: a winch hoisting device that hoists a suspension wire 31 at positions off-set from just above the storage cans 101; a hook member 40 that is connected to the suspension wire 31 to support bottom parts of the storage cans 101; and a rotation inhibiting guide 50 that inhibits a behavior of rotation of the hook member 40 around a suspension point to which is connected the suspension wire 31 when the hook member 40 is hoisted.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a storage can transport system.

  In the event of a severe accident in which nuclear power plant loses coolant and melts nuclear fuel, it is necessary to collect, store, and transport the fuel debris that has cooled and hardened together with the reactor structure and control rods. Fuel debris must be stored in a sealable container in order to continue to emit high levels of radiation. In order to secure this sealing property, there is a method of firmly fixing the lid to the storage can by fastening the bolt.

  Patent Document 1 listed below discloses a nuclear fuel material extraction method in a nuclear power plant. In this method, a plurality of radiation shielding bodies each having a hollow body in which a radiation shielding material is sealed are filled in a reactor containment vessel, and the molten nuclear fuel material existing in the reactor containment vessel is filled with the plurality of radiation shielding bodies. Cover the upper part, lower the cutting part of the boring device down to the upper surface of the molten nuclear fuel material inside the reactor containment vessel filled with the radiation shielding body, cut the molten nuclear fuel material using the cutting part, and cut the molten nuclear fuel material The piece is collected.

JP 2014-109444 A

  By the way, as a method of storing and transporting the recovered fuel debris in a storage can, an enclosure (shielding work space) is installed above the reactor containment vessel, and the side of the reactor containment vessel is placed in the enclosure. The storage can is carried in from the fuel storage pool, the recovered fuel debris is stored in the storage can, and the storage can is transported out of the enclosure. This method is advantageous in that a storage can that stores fuel debris can be temporarily stored in a fuel storage pool. However, this method requires that the storage can be lifted (lifted) from the fuel storage pool to the enclosure.

  The storage can secures the sealing performance by fixing the lid to the storage can. For example, if the storage can is lifted through the lid, the sealing performance may be impaired. In addition, a method is also conceivable in which a support base is disposed at the bottom of the storage can and the storage can is lifted through the support base. However, since the hoisting device winds up or winds the wire directly above the storage can, the storage can Work, for example, the work of storing fuel debris in the storage can and the operation of attaching and detaching the lid to the storage can interfere with workability.

  The present invention has been made in view of the above-described problems, and can storage cans can be transported without impairing the sealing performance of the storage cans and without interfering with the work immediately above the storage cans. The purpose is to provide a system.

  In order to solve the above-described problems, the present invention includes a storage can lifting mechanism that lifts and lowers a storage can, and the storage can lifting mechanism winds up a suspension wire at a position offset from directly above the storage can. A hook member connected to the suspension wire and supporting the bottom of the storage can; and when the hook member is lifted, the hook member is prevented from rotating around the suspension point to which the suspension wire is connected. A storage can transport system including a rotation suppression guide is employed.

  In the present invention, the hook member includes a tip portion that supports a bottom portion of the storage can, an engagement shaft that projects in a width direction immediately below the suspension point, and the tip portion that sandwiches the engagement shaft. And a rear end portion projecting to the opposite side of the rotation suppression guide, the rotation suppression guide engaging with the engagement shaft, and when the engagement groove engages with the engagement shaft, A configuration is adopted in which a contact portion that contacts the upper surface of the rear end portion is provided.

  In the present invention, the storage can lifting mechanism includes the hoisting device, the support position where the hook member is positioned below the storage can, and the retreat position where the hook member is retracted from the support position. A configuration is adopted in which a moving device for moving the hoisting device is provided.

  Moreover, in this invention, the storage can conveyance container which can store the said storage can is provided, and the said storage can raising / lowering mechanism employ | adopts the structure of raising / lowering the said storage can via the said storage can conveyance container.

  Further, in the present invention, a storage can rotating mechanism that includes a storage can replacement mechanism that replaces the storage can that is moved up and down by the storage can lifting mechanism, and the storage can replacement mechanism rotatably supports the plurality of storage cans. The structure of comprising is adopted.

  In the present invention, the storage can replacement mechanism includes a turntable motor unit, and a gear unit that connects the turntable motor unit and the storage can turntable, and the turntable motor unit and the storage The can rotary table and the gear unit are configured to be detachably combined in the vertical direction.

According to the present invention, the hoisting wire is wound up at the position where the hoisting device is offset from directly above the storage can, and the hook member connected to the hoisting wire lifts the bottom of the storage can. When the hoisting wire is wound up at a position offset from directly above the storage can by the hoisting device, a rotational moment is applied to the hook member that supports the bottom of the storage can. In the present invention, a rotation suppression guide for canceling this rotational moment is provided, and by suppressing the rotational behavior of the hook member, the storage can is raised and lowered at a position offset from directly above the storage can while supporting the bottom of the storage can. Is possible.
Therefore, the present invention provides a storage can transport system that can transport the storage can without impairing the sealing performance of the storage can and without interfering with the operation immediately above the storage can.

It is sectional drawing which shows schematic structure of the nuclear reactor in which the storage can conveyance system in embodiment of this invention is installed. It is a perspective view which shows the structure of the storage can which the storage can conveyance system in embodiment of this invention conveys. It is a perspective view which shows the storage can conveyance system in embodiment of this invention. It is a top view which shows the storage can conveyance system in embodiment of this invention. It is a perspective view which shows the structure of the bottom part of the storage can conveyance system in embodiment of this invention. FIG. 5 is a cross-sectional view taken along line AA shown in FIG. 4. It is a disassembled perspective view of the storage can replacement | exchange mechanism with which the storage can conveyance system in embodiment of this invention is provided. It is arrow BB sectional drawing shown in FIG. It is explanatory drawing which shows operation | movement of the storage can conveyance system in embodiment of this invention. It is explanatory drawing which shows operation | movement of the storage can conveyance system in embodiment of this invention. It is explanatory drawing which shows operation | movement of the storage can conveyance system in embodiment of this invention.

  Hereinafter, an embodiment of a storage can transport system of the present invention will be described with reference to the drawings. In the following description, a storage can that collects fuel debris is illustrated, but the present invention can also be applied to a storage can that stores non-fuel debris.

First, an example of the installation location of the storage can transport system of the present embodiment will be described.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a nuclear reactor in which a storage can transport system 1 according to an embodiment of the present invention is installed.
The nuclear reactor shown in FIG. 1 is a MARK-I boiling water reactor, which is one of boiling water reactors. This nuclear reactor includes a nuclear reactor pressure vessel 201 (RPV) and a steel reactor containment vessel 202 (PCV) provided surrounding the nuclear reactor pressure vessel 201.

  The reactor containment vessel 202 is a primary containment of the reactor pressure vessel 201, and forms a pressure barrier and a barrier against the release of radioactive materials when the coolant is lost. The reactor containment vessel 202 is a steel self-contained containment vessel whose base is supported by the reactor building foundation.

  The reactor containment vessel 202 is provided in a concrete reactor building 203 (R / B) as a radioactive shield. The periphery of the reactor containment vessel 202 is thickly covered with a biological shielding wall 203a that forms a part of the reactor building 203, and the radioactive contamination region and the clean region are isolated by the biological shielding wall 203a. The nuclear reactor containment vessel 202 includes a pressure suppression system including a dry well 204 (D / W), a suppression chamber 205 (S / C), and a vent pipe 206.

The suppression chamber 205 is made of a steel pipe disposed in an annular shape (doughnut shape) below the reactor containment vessel 202. The suppression chamber 205 communicates with the dry well 204 of the reactor containment vessel 202 through a plurality of vent pipes 206.
The vent pipe 206 connects the space of the dry well 204 and the underwater of the suppression chamber 205. The vent pipe 206 has a vent header 207 and a downcomer 208.

  The vent header 207 is provided in an annular shape within the suppression chamber 205 and is connected to a plurality of vent pipes 206. The downcomer 208 is provided so as to branch from the vent header 207 and open into the pool water of the suppression chamber 205. A plurality of downcomers 208 are provided between adjacent vent pipes 206.

  A torus chamber 209 that is located around the lower portion of the reactor containment vessel 202 and contains the suppression chamber 205 is provided in an annular shape in the basement of the reactor building 203. The torus room 209 is formed as an underground structure that forms a part of a concrete reactor building 203 as a radioactive shield.

  In this nuclear reactor, when a severe accident occurs in which nuclear fuel melts, it is necessary to collect the fuel debris that has cooled and hardened together with the nuclear reactor structural materials and control rods, and store and transport them. When recovering fuel debris from the reactor containment vessel 202, the reactor containment vessel 202 is flooded with a coolant in order to shield the radiation emitted from the fuel debris, and the fuel debris is removed from the coolant. It is conceivable to collect.

  In the example shown in FIG. 1, an enclosure 210 (shielding work space) that shields radiation is installed above the reactor containment vessel 202, and the fuel debris recovery device 211 installed in the enclosure 210 causes fuel debris from the reactor containment vessel 202. Recover. The enclosure 210 has a floor extending to the fuel storage pool 213 provided on the side of the reactor containment vessel 202, and a through hole into which the storage can 101 can be inserted from the lower fuel storage pool 213 side. 212 is formed.

  The storage can transport system 1 of the present embodiment is installed along the wall on the reactor containment vessel 202 side in the fuel storage pool 213, and the storage can 101 is taken in and out of the enclosure 210 through the through hole 212. It has become. A storage can lid attaching / detaching device 214 is installed in the vicinity of the through hole 212 in the enclosure 210, and the storage can 101 is removed by removing the lid 100 (see FIG. 2 described later) of the storage can 101 inserted into the enclosure 210. Then, the fuel debris is stored, and then the lid 100 is attached to the storage can 101. The storage can 101 containing the fuel debris is lowered from the enclosure 210 and temporarily stored on the storage can storage frame 215 in the fuel storage pool 213, and is then transported from the fuel storage pool 213 by the storage can carry-in / out device 216. Is done.

Next, the structure of the storage can 101 which is a conveyance object of the storage can conveyance system of this embodiment is demonstrated.
FIG. 2 is a perspective view showing the configuration of the storage can 101 transported by the storage can transport system 1 according to the embodiment of the present invention.
As shown in FIG. 2, the storage can 101 is formed in a bottomed cylindrical shape and stores fuel debris. The upper end opening of the storage can 101 is closed by a disc-shaped lid 100.

  The storage can 101 includes a filter 102, a drain channel 103, and a drain plug 104. The filter 102 is disposed at the bottom of the storage can 101. One end of the drainage channel 103 is connected to the filter 102. The drainage channel 103 extends upward through the inside of the side wall of the storage can 101. The drain plug 104 is connected to the other end of the drain channel 103. The drain plug 104 is attached so as to protrude upward from the upper end surface of the storage can 101.

  The lid 100 includes a through hole 105 and a dry plug 106. The through-hole 105 is formed in the peripheral part of the lid | cover 100, and the drain plug 104 is arrange | positioned. The dry plug 106 is attached to the center portion of the lid 100. A drying line (not shown) is connected to the drying plug 106. Further, a drain line (not shown) is connected to the drain plug 104. When dry gas (nitrogen gas or the like) is supplied to the inside of the storage can 101 via the dry plug 106, the inside of the storage can 101 is pressurized, and the coolant (water) stored together with the fuel debris is filtered, It is discharged from the drain plug 104 through the drain channel 103.

  The lid 100 is fastened and fixed to the storage can 101 by a bolt 111. A plurality of bolts 111 (six in this embodiment) are arranged at equal intervals along the peripheral edge of the lid 100. The lid 100 includes a suspended portion 120. The suspended portion 120 is formed in a cylindrical shape, and is disposed so as to be inside the bolt 111 and to surround the outside of the dry plug 106. The suspended portion 120 is formed with an engagement groove 121 for the storage can lid attaching / detaching device 214 to handle.

Next, the configuration of the storage can transport system 1 that transports the storage can 101 having the above configuration will be described.
FIG. 3 is a perspective view showing the storage can transport system 1 according to the embodiment of the present invention. FIG. 4 is a plan view showing the storage can transport system 1 according to the embodiment of the present invention. FIG. 5 is a perspective view showing the configuration of the bottom of the storage can transport system 1 according to the embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line AA shown in FIG. FIG. 7 is an exploded perspective view of the storage can replacement mechanism 3 provided in the storage can transport system 1 according to the embodiment of the present invention. FIG. 8 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 3, the storage can transport system 1 includes a storage can lifting mechanism 2 and a storage can replacement mechanism 3. The storage can lifting mechanism 2 moves the storage can 101 up and down. The storage can replacement mechanism 3 replaces the storage can 101 that is lifted and lowered by the storage can lifting mechanism 2. The storage can transport system 1 transports the storage can 101 via a storage can transport container 4.

  The storage can transport container 4 is formed in a bottomed cylindrical shape that is slightly larger than the storage can 101. As shown in FIGS. 4 and 5, positioning protrusions 4 a are formed in four directions on the inner peripheral surface of the storage can transport container 4. The positioning protrusion 4 a positions the storage can 101 in the center of the storage can transport container 4.

As shown in FIG. 3, the storage can lifting mechanism 2 includes a main body frame 10, a traversing trolley 20 (moving device), a hoisting device 30, a hook member 40 as shown in FIG. 5 and FIG. A deterrent guide 50.
The main body frame 10 is formed in a tower shape extending vertically upward from the bottom of the fuel storage pool 213. As shown in FIG. 3, a joint 10 a is formed at an important point in the vertical direction of the main body frame 10, and the main body frame 10 is formed by assembling a plurality of units.

  The main body frame 10 includes a bottom unit 11, two intermediate units 12, and a top unit 13. The bottom unit 11 includes a base 11 a placed on the bottom of the fuel storage pool 213. The base 11a is formed in a size that allows the storage can replacement mechanism 3 to be installed. The intermediate unit 12 includes a guide bar 12a that guides the storage can transport container 4 storing the storage can 101 so as to freely move up and down.

  The guide bar 12a is formed in a cylindrical back cage shape of a monkey ladder. A dosimeter 14 is installed at a height equivalent to the guide bar 12 a of the upper intermediate unit 12. The dosimeter 14 is attached to the wall of the fuel storage pool 213 (on the reactor containment vessel 202 side shown in FIG. 1). The dosimeter 14 measures the radiation dose when the storage can 101 is inserted into the through-hole 212 and work is performed in the enclosure 210.

  Returning to FIG. 3, the top unit 13 includes a rail 13 a that forms a trajectory of the traversing trolley 20. The rails 13a are provided in a pair and extend linearly in the horizontal direction toward the storage can replacement mechanism 3. The joint 10a of the main body frame 10 has an inlay fitting structure. For this reason, the main body frame 10 can be assembled underwater without bolting or the like by hanging the bottom unit 11, the two intermediate units 12, and the top unit 13 in this order in the fuel storage pool 213.

The traversing trolley 20 is equipped with a hoisting device 30 and moves the mounted hoisting device 30 along the rail 13a. As shown in FIGS. 3 and 4, a motor 21 serving as a drive source is disposed behind the traversing trolley 20.
The hoisting device 30 winds the suspension wire 31 at a position offset from directly above the storage can 101. That is, the moving range of the hoisting device 30 by the traversing trolley 20 is up to a position just above the storage can 101 as shown in FIG. A motor 21 serving as a drive source is supported on the left and right sides of the traversing trolley 20. As shown in FIG. 5, two hoisting wires 31 are suspended from the hoisting device 30 in parallel.

  The hook member 40 is connected to the suspension wire 31 and supports the bottom of the storage can 101 via the storage can transport container 4. As shown in FIGS. 5 and 6, the hook member 40 includes a front end portion 41, an engagement shaft 42, and a rear end portion 43. The tip portion 41 protrudes forward with respect to the hanging point 40a to which the hanging wire 31 is connected. The distal end portion 41 can be inserted below the storage can transport container 4 that stores the storage can 101. The hook member 40 is moved by the traversing trolley 20 at a support position (see FIG. 10 to be described later) where the front end 41 is located below the storage can transport container 4 storing the storage can 101, and the front end 41 is retracted from the support position. It is possible to move between the retracted positions (see FIG. 6).

  As shown in FIGS. 5 and 6, the engagement shaft 42 protrudes in the width direction (left-right direction) immediately below the suspension point 40 a. The engagement shaft 42 is formed in a cylindrical shape. The rear end portion 43 protrudes on the opposite side of the front end portion 41 with the engagement shaft 42 interposed therebetween. The protrusion amount (length) of the rear end portion 43 is smaller than the protrusion amount (length) of the front end portion 41. The rear end portion 43 is formed in a block shape in order to balance the weight with the front end portion 41. A rotation suppression guide 50 can be brought into contact with the upper surface 43a of the rear end portion 43 formed in the block shape.

  The rotation suppression guide 50 suppresses the rotation behavior of the hook member 40 around the suspension point 40a to which the suspension wire 31 is connected when the hook member 40 is lifted. In other words, the rotation suppression guide 50 cancels the rotational moment of the hook member 40 due to the load received by the tip 41 that supports the storage can 101 via the storage can transport container 4. The rotation suppression guide 50 includes an engagement groove 51, a contact portion 52, and a cam follower 53.

  As shown in FIG. 5, the rotation suppression guide 50 has a shape that is obtained by bending the frame into a U shape in plan view, and includes one engagement groove 51 and one contact portion 52 on the left and right. The engagement groove 51 has a semicircular arc shape and engages with the engagement shaft 42. The contact portion 52 contacts the upper surface 43 a of the rear end portion 43 when the engagement groove 51 is engaged with the engagement shaft 42. The cam follower 53 is rotatably provided on the left and right sides of the rotation suppression guide 50. Two cam followers 53 are provided on the upper and lower sides. The cam follower 53 is engaged with a cam follower guide 15 having a U-shape in plan view so as to be movable up and down. The cam follower guide 15 is supported by the main body frame 10.

As shown in FIG. 7, the storage can replacement mechanism 3 includes a turntable motor unit 60, a turntable stand unit 70 (storage can turntable), a gear unit 80, and a turntable support unit 90.
The turntable motor unit 60 rotates the turntable stand unit 70 via the gear unit 80. As shown in FIG. 4, the turntable motor unit 60 includes a service motor housing portion 61, an emergency motor housing portion 62, and a gear housing portion 63.

  The service motor housing 61 houses a service motor, and the output shaft of the service motor is connected to a bevel gear mechanism (not shown) housed in the gear housing 63. The emergency motor accommodating portion 62 accommodates an emergency motor, and the output shaft of the emergency motor is connected to a bevel gear mechanism (not shown) accommodated in the gear accommodating portion 63 via a clutch (not shown). . Thereby, when the service motor is driven, the torque is not transmitted to the emergency motor by the clutch, and conversely, when the service motor is driven, the clutch is engaged and the torque is transmitted.

  As shown in FIG. 7, the turntable stand unit 70 includes a rotation shaft 71, a support portion 72, a rotation guide portion 73, and a slot portion 74. The rotating shaft 71 is formed in a hollow cylindrical shape and extends in the vertical direction. The support portion 72 supports the storage can 101 via the storage can transport container 4 and is integrally fixed to the rotating shaft 71. The support portion 72 is formed of a frame assembled in a well shape, and the tip end portion 41 of the hook member 40 can be inserted into a gap between adjacent frames. A plurality of rollers 72 a are attached to the lower portion of the support portion 72.

  The rotation guide portion 73 is integrally fixed to the rotation shaft 71 below the support portion 72. The rotation guide portion 73 is formed in a disc shape and is disposed at the lower end portion of the rotation shaft 71. The slot portion 74 is integrally fixed to the rotating shaft 71 above the support portion 72. The slot portion 74 has a shape in which a plurality of peripheral portions of the disc are cut out in an arc shape, and is disposed at the upper end portion of the rotating shaft 71. A plurality of guide bars 74a bent so that the upper end portion is opened are provided in the cutout of the slot portion 74 so that the storage can transport container 4 can be easily inserted and removed.

  The turntable support unit 90 supports the turntable stand unit 70 rotatably. As shown in FIG. 7, the turntable support unit 90 is formed in an annular shape, and its inner peripheral surface is formed by a plurality of rollers 91. The plurality of rollers 91 abut on the outer peripheral surface of the rotation guide portion 73 of the turntable stand unit 70. The turntable support unit 90 is fixed to the base 11a.

  The gear unit 80 includes a connection shaft 81 connected to the turntable motor unit 60 and a connection shaft 82 connected to the turntable stand unit 70. The connection shafts 81 and 82 extend vertically upward, and the gear unit 80 connects the turntable motor unit 60 and the turntable stand unit 70 in a U-shape. The gear unit 80 is disposed below the turntable support unit 90 and is fixed to the base 11a.

  As shown in FIG. 7, the turntable motor unit 60, the turntable stand unit 70, and the gear unit 80 are combined so as to be detachable in the vertical direction. Specifically, as shown in FIG. 8, the rotary table motor unit 60 includes a socket 63 a connected to a rotating shaft protruding from the gear housing portion 63, and can be inserted into and removed from the connecting shaft 81 in the vertical direction. . Further, the turntable stand unit 70 can be inserted into and removed from the connecting shaft 82 in the vertical direction by a socket 71a fitted inside a cylindrical rotating shaft 71.

  Accordingly, as shown in FIG. 7, the turntable motor unit 60 and the turntable stand unit 70 can be attached to and detached from the gear unit 80 in the vertical direction. Therefore, even if any one of the turntable motor unit 60 and the turntable stand unit 70 breaks down due to an unexpected situation, remote replacement in water in the fuel storage pool 213 is facilitated. That is, in consideration of remote operation in the fuel storage pool 213, the rotary base motor unit 60 and the rotary base stand unit 70 can be easily replaced by access from directly above.

  Next, the operation of the storage can transport system 1 configured as described above will be described with reference to FIGS.

  First, as shown in FIG. 9, the storage can 101 is loaded into the storage can replacement mechanism 3. The storage can 101 is loaded into the storage can exchange mechanism 3 by the storage can carry-in / out device 216 installed in the fuel storage pool 213 shown in FIG. The storage can replacement mechanism 3 supports a plurality of storage can transport containers 4 on a turntable stand unit 70. The storage can carry-in / out device 216 inserts the empty storage can 101 into one of the storage can transport containers 4 supported by the turntable stand unit 70.

  When the storage can 101 is inserted into the storage can transport container 4, the turntable stand unit 70 is rotated to move the storage can 101 to the lifting / lowering position of the storage can lifting mechanism 2. The turntable stand unit 70 is rotated by the turntable motor unit 60 via the gear unit 80. As shown in FIGS. 3 and 4, the lifting position of the storage can lifting mechanism 2 is a position where the storage can transport container 4 storing the storage can 101 is located directly below the guide bar 12 a (through hole 212). .

  After the storage can 101 is moved to the lift position of the storage can lifting mechanism 2, next, as shown in FIG. 10, the hook member 40 is moved so as to be inserted under the storage can transport container 4. The movement of the hook member 40 is performed by the traversing trolley 20 installed in the top unit 13 of the main body frame 10 shown in FIG. The traversing trolley 20 is equipped with a hoisting device 30 and moves the hook member 40 from the retracted position shown in FIG. 6 to the supporting position shown in FIG. When the hook member 40 moves to the support position, the engagement shaft 42 contacts the rotation suppression guide 50. At this time, the hoisting device 30 and the hanging wire 31 are in a position offset from directly above the storage can 101.

  After the hook member 40 is moved to the support position, the hook member 40 is then lifted and the hook member 40 and the rotation suppression guide 50 are engaged as shown in FIG. The hoisting device 30 lifts the hook member 40. When the hook member 40 is lifted, the engagement shaft 42 engages with the engagement groove 51 of the rotation suppression guide 50. Further, when the engagement shaft 42 engages with the engagement groove 51, the contact portion 52 of the rotation suppression guide 50 contacts the upper surface 43 a of the rear end portion 43. When the hook member 40 engaged with the rotation suppression guide 50 is further lifted in this way, the tip 41 of the hook member 40 comes into contact with the storage can transport container 4 and the storage can 101 rises together with the storage can transport container 4.

  In the present embodiment, the hoisting wire 31 is wound up at a position where the hoisting device 30 is offset from directly above the storage can 101, and the hook member 40 connected to the suspension wire 31 is connected to the bottom of the storage can 101 via the storage can transport container 4. Lift up. When the hoisting wire 31 is wound up at a position offset from directly above the storage can 101 by the hoisting device 30, a rotational moment about the suspension point 40 a is applied to the hook member 40 that supports the bottom of the storage can 101. In the present embodiment, a rotation suppression guide 50 for canceling this rotational moment is provided, and by suppressing the rotational behavior of the hook member 40, the bottom portion of the storage can 101 is supported while being offset from directly above the storage can 101. The storage can 101 can be moved up and down.

  Specifically, the hook member 40 includes a distal end portion 41 that supports the bottom of the storage can 101, an engagement shaft 42 that projects in the width direction immediately below the suspension point 40a, and the distal end portion 41 with the engagement shaft 42 interposed therebetween. And a rear end portion 43 that protrudes on the opposite side, and the rotation suppression guide 50 includes an engagement groove 51 that engages with the engagement shaft 42, and when the engagement groove 51 engages with the engagement shaft 42. A contact portion 52 that contacts the upper surface 43a of the rear end portion 43. According to this configuration, even when a load is applied to the front end portion 41 of the hook member 40 and the hook member 40 tries to rotate around the engagement shaft 42, the upper surface 43 a of the rear end portion 43 of the hook member 40 is not rotated. Rotation behavior of the hook member 40 is suppressed by abutting on the abutting portion 52 of the hook member 40.

  The rotation suppression guide 50 includes cam followers 53 on the left and right sides. The cam follower 53 is engaged with the cam follower guide 15, guides the vertical movement of the hook member 40 engaged with the rotation suppression guide 50, and supports (loads) the load received by the rotation suppression guide 50 from the hook member 40. The rotational behavior of the hook member 40 is suppressed. Further, when the hook member 40 is raised, the side portion of the storage can transport container 4 is always guided by the guide bar 12a shown in FIG. 3, so that the storage can transport container 4 that is being lifted can be prevented from falling. Thereby, the storage can transport container 4 (storage can 101) can be stably guided in an upright posture while suppressing the rotational behavior of the hook member 40.

  When the upper end of the storage can 101 is inserted into the enclosure 210 shown in FIG. 1 by the storage can lifting mechanism 2, the cover 100 is removed by the storage can lid attaching / detaching device 214, and the fuel debris is stored in the storage can 101. Is done. In the meantime, the radiation dose of the storage can 101 is measured by the dosimeter 14 shown in FIG. 3, and the leakage of radiation is monitored. When the fuel debris is stored in the storage can 101, the cover 100 is attached by the storage can lid attaching / detaching device 214, and the storage can 101 is suspended and supported by the turntable stand unit 70 (the state shown in FIG. 3).

  When the storage can 101 is suspended, the bottom of the storage can 101 is supported by the hook member 40, so that the sealing performance of the storage can 101 is maintained without applying a load to the lid 100. In addition, since the hoisting device 30 winds up the suspension wire 31 at a position offset from directly above the storage can 101, the operation directly above the storage can 101, that is, the operation of storing fuel debris in the storage can 101 or the storage can 101. On the other hand, the operation of attaching and detaching the lid 100 can be prevented from being disturbed.

  As shown in FIG. 3, the turntable stand unit 70 supports the storage can 101 in a rotatable manner. If the empty storage can 101 is previously supported on the turntable stand unit 70 as shown in FIG. 9, the storage can 101 storing the fuel debris and the empty storage can 101 can be efficiently exchanged by rotation. Can do. That is, the storage can exchange mechanism 3 is constituted by, for example, a slide mechanism, and the storage cans 101 can be exchanged at a time by rotating the turntable stand unit 70 rather than exchanging the storage cans 101 one by one.

  The empty storage can 101 moved to the lifting / lowering place of the storage can lifting mechanism 2 by the rotation of the turntable stand unit 70 is similarly lifted and lowered together with the storage can transport container 4 to store fuel debris. In the present embodiment, the storage can 101 is moved up and down via the storage can transport container 4, and the storage can 101 storing the fuel debris is not damaged, and stable without being affected by the size difference of the storage can 101. Transport is possible. On the other hand, the storage can 101 containing the fuel debris retreated from the lifting position of the storage can lifting mechanism 2 by the rotation of the turntable stand unit 70 is temporarily stored in the storage can storage stand 215 shown in FIG. After being stored, the fuel storage pool 213 is taken out.

  As described above, according to the above-described embodiment, the storage can lifting mechanism 2 that lifts and lowers the storage can 101 is provided, and the storage can lifting mechanism 2 winds up the suspension wire 31 at a position offset from directly above the storage can 101. The upper device 30, the hook member 40 connected to the suspension wire 31 and supporting the bottom of the storage can 101, and the hook member 40 centered on the suspension point 40 a to which the suspension wire 31 is connected when the hook member 40 is lifted. By adopting the storage can transport system 1 provided with a rotation suppression guide 50 that suppresses the rotational behavior of the storage can 101 without impairing the sealing performance of the storage can 101 and obstructing the work immediately above the storage can 101 The storage can 101 can be conveyed without any problem.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Storage can conveyance system 2 Storage can raising / lowering mechanism 3 Storage can exchange mechanism 4 Storage can conveyance container 20 Traversing trolley (moving device)
30 Hoisting device 31 Hanging wire 40 Hook member 40a Hanging point 41 Front end portion 42 Engagement shaft 43 Rear end portion 43a Upper surface 50 Rotation suppression guide 51 Engaging groove 52 Abutting portion 60 Rotating base motor unit 70 Can turntable)
80 gear unit 101 storage can

Claims (6)

Equipped with a storage can lifting mechanism that lifts and lowers the storage can,
The storage can lifting mechanism is
A hoisting device for hoisting a suspension wire at a position offset from directly above the storage can;
A hook member connected to the suspension wire and supporting the bottom of the storage can;
A storage can transport system, comprising: a rotation suppression guide that suppresses the rotation behavior of the hook member around a suspension point to which the suspension wire is connected when the hook member is lifted. The hook member is
A tip portion supporting the bottom of the storage can;
An engagement shaft projecting in the width direction immediately below the suspension point;
A rear end portion that protrudes on the opposite side of the front end portion across the engagement shaft, and
The rotation suppression guide is
An engagement groove that engages with the engagement shaft;
The storage can transport system according to claim 1, further comprising: an abutting portion that abuts against an upper surface of the rear end when the engaging groove engages with the engaging shaft.   The storage can lifting mechanism is mounted with the hoisting device, and the winding can be provided between a support position where the hook member is located below the storage can and a retracted position where the hook member is retracted from the support position. The storage can transport system according to claim 1, further comprising a moving device that moves the upper device. A storage can transport container that can store the storage can,
The said storage can raising / lowering mechanism raises / lowers the said storage can via the said storage can conveyance container, The storage can conveyance system as described in any one of Claims 1-3 characterized by the above-mentioned. A storage can exchange mechanism for exchanging the storage can that the storage can lifting mechanism is moved up and down;
5. The storage can transport system according to claim 1, wherein the storage can exchange mechanism includes a storage can rotating table that rotatably supports the plurality of storage cans. The storage can exchange mechanism is
A turntable motor unit;
A gear unit that connects the turntable motor unit and the storage can turntable, and
The storage can transport system according to claim 5, wherein the turntable motor unit, the storage can turntable, and the gear unit are detachably combined in the vertical direction.

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