JP2007248068A - System for conveying cask for storing spent fuel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cask conveying system for spent fuel storage that conveys a storage frame of a cask with an air bag, densely arranges a lot of casks in a storage area, and can fix the storage frame accurately. <P>SOLUTION: In an air bag type cask conveying system for spent fuel storage for conveying the storage frame 8 carrying the cask 7 for spent fuel storage in a storage facility, travel stability is assured by disposing a rear driving device 3 and front driving device 13 at least in two front and back places. The front driving device 13 can be mounted and removed on the right and left sides of the storage frame 8, and the storage frame 8 can be densely fixed to the narrow storage area. The storage frame 8 is positioned to a positioning guide hole disposed in buried hardware 41 in the floor surface for fixing it using guide mechanisms 27 and 28 disposed in two front and back places of the storage frame, and the storage frame 8 can be accurately fixed without requiring high-grade operating skill of an operator. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spent fuel storage cask (shielding container) transport system, and in particular, transports a storage stand with a cask for storing spent fuel generated from a nuclear power plant in the medium to long term in a storage facility. The present invention relates to a transport system.

  Fuel that has been used for a certain period in the core of a nuclear power generation facility is removed from the core and temporarily stored in a spent fuel pool. Here, the fuel cooled for a predetermined period is finally carried out to a reprocessing plant and reprocessed, and uranium and plutonium are taken out as resources for reuse.

  Currently, spent fuel generated at nuclear power plants is increasing with increasing power demand, so even if the reprocessing plant is in operation, the spent fuel generated in Japan exceeds the processing capacity of the reprocessing plant. Therefore, the period until reprocessing must be properly managed and stored. The required storage is estimated to be 4,400 tU in 2010 and 7,100 tU in 2020.

  Methods for managing and storing spent fuel on or off the site of a nuclear power plant include dry-type storage methods such as dry-cask storage, vault storage, silo storage, and concrete cask storage, and wet-storage methods for water pools. is there. In view of cost and long-term stable storage, dry storage is attracting attention.

  Among the dry storage systems, the cask storage system currently in practical use in Japan is a method of storing spent fuel in a dry cask that is a radioactive material shielding container. The dry cask containing spent fuel is stored in a storage facility with thick concrete walls in order to minimize the radiation of γ rays and neutron rays to the outside.

  In a system in which a cask having a weight of 120 tons or more is suspended by a crane while containing spent fuel, the size of the storage facility is high and the earthquake resistance is not good. In addition, when a large crane is used, the width of the space in the building is reduced correspondingly, and the cask storage efficiency is reduced.

Since storage facilities are required to shield against radiation and to have earthquake resistance, a so-called air pallet system is desirable as a cask transport device in order to reduce the height of the facility as much as possible. When the air pallet method is adopted, the height of the building can be kept low, and there is no width limitation, and a large amount of cask can be efficiently stored in a compact storage facility.
In addition, even if the storage facility is expanded, it can be easily built by remodeling only a part of the boundary wall with the expanded portion.

Japanese Patent Laying-Open No. 2003-287593 (pages 2-3) Japanese Patent Laid-Open No. 2002-148386 (pages 5-6, FIGS. 5-9)

  However, when transporting the cask by the air pallet method, the frictional force with the floor surface is extremely low because it floats from the floor surface, so the running stability is improved and the storage platform on which the cask is placed is highly accurate. It was difficult to place.

  In the storage rack using the conventional air pallet system of Patent Documents 1 and 2, the driving wheels are arranged only at the rear of the device, so the running stability is poor, or the placement accuracy cannot be ensured, and the storage area is narrow. It was difficult to store a large amount of cask efficiently.

  It is an object of the present invention to use a storage stand for loading a cask to be placed on a floor surface embedded metal fitting with high precision in order to convey a large amount of cask in a storage area by transporting a storage stand by an airbag. A cask transport system for spent fuel storage is provided.

  In order to solve the above-mentioned problems, the present invention provides an air bag-type spent fuel storage cask transport system for transporting a storage stand on which a cask containing spent fuel is placed in a storage facility. It is installed at a place to ensure running stability. In addition, the front drive device can be attached to and removed from the left and right of the storage stand so that the storage stand is densely placed in a narrow storage area. Furthermore, the positioning guide holes provided in the mounting brackets on the floor where the storage stand is placed are accurately positioned using the guide mechanisms provided at two locations on the front and back of the storage stand, so that the operator's advanced driving skills can be improved. Even if there is no, it can be placed with high accuracy.

  According to the present invention, when a metal cask containing spent fuel generated at a nuclear power plant is placed on a storage rack in an intermediate storage facility and transported from a receiving inspection area to a storage area, the storage area has a small installation area. A large number of casks can be placed densely and placed with extremely high accuracy, so that storage efficiency is high and a storage facility with a simple structure that does not require an overhead crane can be realized.

  Next, with reference to FIGS. 1-28, the Example of the cask conveyance system for spent fuel storage by this invention is described.

  FIG. 1 is a side view showing a schematic configuration of a spent fuel storage cask transport system according to the present invention, and FIG. 2 is a perspective view showing a schematic configuration of a spent fuel storage cask transport system according to the present invention.

  A plurality of airbags 2 that provide levitation force to the cask transport table 1 are provided below the cask transport table 1, and a driving device 3 that drives the main body 1 is provided at one end of the cask transport table 1. When the wheels 4 of the driving device 3 are driven with compressed air, the cask carrier 1 moves. Compressed air is supplied from a compressed air source 6 by a high pressure air hose 5.

  The storage cask 7 is fixed to the storage rack 8 via the trunnion 9. The lower part of the storage stand 8 has a structure in which the cask transfer stand 1 can be inserted in the same manner as a load transfer pallet used in a normal factory or warehouse is inserted into a fork lift fork.

  When transporting the storage cask 7, first, the air of the airbag 2 is removed, the cask transport base 1 is lowered, and the storage cask 7 is inserted under the storage rack 8. Next, when compressed air is put into the airbag 2, the airbag 2 is inflated, and the cask carrier 1 is raised. When compressed air is further fed, a thin air layer is finally formed between the airbag 2 and the ground, and the cask carrier 1 is lifted.

  In the floating state, there is only a thin air layer between the airbag 2 and the ground, so the coefficient of friction with the ground is about 3/1000. That is, even when a weight of 100 tons is transported, as long as the ground is horizontal, it can move with a driving force of 300 kg at most, so the air motor of the driving device 3 may have a very small power.

  FIG. 3 is a plan view showing the configuration of the first embodiment of the spent fuel storage cask transport system according to the present invention.

  The tip portion of the cask carrier 1 is divided into two like a fork of a forklift, and a plurality of airbags 21 are attached to the lower portion of the fork portion. From the viewpoint of running stability, it is necessary to dispose at least two airbags 21 on each of the fork portions. In that case, the loading load of one airbag 21 is ¼ of the combined weight of the storage stand 8, the storage cask 7, and the main body 1 mounted on the main body.

  In the present invention, if the airbag 21 is punctured in the middle of conveyance, or if there is a large step in the conveyance path, the loading capacity is insufficient. Three for each fork part, a total of six.

  A rear drive unit 11 is provided at the rear part of the cask carrier 1. Although details of the structure will be described later, the wheels are rotated by an air motor that obtains a driving force by the adjusted compressed air. The compressed air is supplied from an air hose 16 that is fed from a hose reel 15 provided in the upper part of the driving device 3 and connected to a compressed air source (not shown). The hose reel 15 is also driven by the air motor 17.

  When the total length of the storage facility is longer than the loaded air hose 16, it is necessary to stop temporarily during the conveyance, wind the air hose 16 around the hose reel 15, and reconnect it to another compressed air source. The hose reel driving air motor 17 is connected to another compressed air source via a thin and short air hose 18 so that the hose reel 15 can be driven.

  During the conveyance, the air hose 16 must be fed out or wound up by rotating the hose reel driving air motor 17 in accordance with the movement of the main body. At that time, the air motor 17 for driving the hose reel is rotated by the compressed air supplied through the air hose 16. That is, the air hose 18 is used only when the compressed air source of the air hose 16 is switched. The drive source of this hose reel has an advantage that only a compressed air pipe for delivering compressed air needs to be provided in the vicinity of the traveling passage of the storage facility.

  An electric motor may be used instead of the air motor. In that case, a power cable longer than the air hose 16 is required. In addition, if it is set as the system which drives an electric motor with a battery, a power cable will become unnecessary.

  The controller 12 for operating the driving device 3 is of a size that can be carried by an operator and is connected to the driving device 3 with a long cable, so that it can be operated while monitoring the running state of the cask carrier 1. .

  When loading and unloading the storage stand 8, the compressed air from the airbag 21 must be removed to lower the cask carrier 1. In that case, at least one wheel 23 that supports the cask carrier 1 at the time of no load is provided at the tip of the fork portion of the cask carrier 1 so that the seating portion at the center of the airbag 21 does not contact the ground. Provide.

  A feature of the present invention is that, in addition to the driving device 3, the front driving device 13 that is not integrated with the cask transport table 1 and can be attached to and detached from the storage rack 8 mounted on the cask transport table 1 is employed.

  FIG. 4 is a plan view showing a state in which a storage stand is placed on a spent fuel storage cask transport system with a front drive device mounted on the right side, and FIG. 5 is a spent fuel storage cask transport of FIG. It is a right view of a system.

  4 and 5, the front drive unit 13 is shown in a state separated from the cask carrier 1. The front drive unit 13 is not integrated with the cask carrying table 1 and has a structure that can be attached to and detached from the storage rack 8 placed on the cask carrying table 1. In this case, the front drive unit 13 is attached to the right front of the storage stand 8.

  A storage cask 7 is placed on the storage platform 8 using a crane provided in the reception inspection area of the intermediate storage facility.

  When the storage cask 7 is placed on the cask carrier 1, positioning to some extent is necessary, and therefore a positioning plate 22 is provided on the upper part of the cask carrier 1. When the cask carrier 1 is inserted into the lower part of the storage frame 8, the rear end surface of the storage frame 8 is pressed against the positioning plate 22, and then compressed air is fed into the airbag 21 for positioning.

  In this state, the positioning guide pin drive mechanism 28 is attached to the right front corner portion of the storage stand 8. Similarly, another positioning guide pin drive mechanism 27 is attached to the left rear corner of the storage stand 8.

  FIG. 6 is a plan view showing a state in which a storage stand is placed on a spent fuel storage cask transfer system with a front drive device mounted on the left side surface.

  In order to densely arrange the storage rack 8 of the storage cask 7 in the storage area of the intermediate storage facility, the front drive unit 13 can be attached to either the left or right in front of the storage rack 8. In FIG. 6, the front drive unit 13 and the positioning guide pin drive mechanism 28 are attached at positions symmetrical with respect to FIG. 4.

  FIG. 7 is a plan view showing a method of placing a storage stand in a storage area by a spent fuel storage cask transport system with a front drive device mounted on the right side surface. FIG. 8 is a plan view showing a method of placing a storage stand in a storage area by a spent fuel storage cask transport system with a front drive device mounted on the left side.

  FIG. 7 shows the positional relationship between the storage platform 8 and the storage facility columns 31 and 32 or the walls 33 and 34 in the storage area. In storage facilities with a large number of pillars, as a method of densely placing the storage stands 8 in a storage area surrounded by a large number of pillars, the storage stands 8 are arranged in two rows between the pillars, and each is placed on the pillar or wall as much as possible. Try to adhere. Therefore, when the storage stand 8 is moved toward the pillars 31 and 32, the front drive unit 13 is attached to the right front corner portion of the storage stand 8 as shown in FIG.

  When the front drive unit 13 is attached to the left front corner, a space corresponding to the width of the front drive unit 13 plus a margin can be secured between the storage rack 8 and the columns 31 and 32. is necessary. On the other hand, when the front drive unit 13 is attached to the right front corner, the space between the storage rack 8 and the columns 31 and 32 is a width obtained by adding a margin to the width of the positioning guide pin drive mechanism 27. Since only a minute is required, the space width can be considerably reduced.

  Similarly, when the storage task 8 is brought closer to the pillars 31A and 32A as shown in FIG. 8, the front drive device 13 is stored in the left front corner of the storage stand 8 as shown in FIG. The space between the gantry 8 and the pillars 31A and 32A can be narrowed.

  3 or 6, the rear drive unit 11 and the front drive unit 13 are basically operated by separate controllers 12 and 14, respectively. When traveling in the traveling area in the storage facility, for example, the operation functions are concentrated on the controller connected to the rear drive unit, and the rear drive unit 11 and the front drive unit 13 are integrally controlled to be stored in the storage area. When entering and performing detailed operations, the rear drive unit 11 and the front drive unit 13 are controlled independently by the respective controllers 12 and 14.

  FIG. 9 is a plan view showing an attachment position of the positioning guide pin driving mechanism to the storage frame. FIG. 10 is a side view showing the relationship between the positioning guide pin driving mechanism of the storage frame and the guide pin insertion hole 43 of the embedded metal 41.

  Although the positioning guide pin driving mechanisms 27 and 28 are also shown in FIG. 4 or FIG. 6, the positioning guide pin driving mechanisms 27 and 28 are in the vicinity of the front driving device 13 that can be attached to or removed from either the front left or right side of the storage rack 8 to be loaded on the cask carrier 1. One is provided at each corner of the storage rack and at the diagonal position.

  FIG. 11 is a plan view showing the structure of an embodiment of the embedded metal according to the present invention, and FIG. 12 is a cross-sectional view showing the structure of the embedded metal of FIG.

  The storage stand is fixed on the embedded metal 41 embedded in the floor of the storage facility. As shown in FIG. 11, the embedded metal fitting 41 is substantially square-shaped in accordance with the outer peripheral shape of the storage rack 8 when viewed from above. At least four or more female screws 42 for fixing the storage stand 8 with bolts 38 are formed in the embedded metal 41 in the left and right side plates in the traveling direction of the transport device, and one each in the center of the front and rear plates. I can make it. Two positioning guide pin insertion holes 43 and 43A are formed in the square diagonal positions of the left and right projecting portions of the front and rear plates.

  As shown in FIG. 12, a large number of studs 44 are welded to the lower surface of the embedded metal 41 and embedded in the reinforced concrete floor 45. The embedded metal 41 is embedded in the reinforced concrete 45 so that the upper surface of the embedded metal 41 is kept as horizontal as possible.

  The reason why the positioning guide pin drive mechanism 28 is arranged in the vicinity of the front drive device 13 is to increase the placement accuracy of the transport device. That is, when the storage stand 8 placed on the cask transfer stand 1 is placed on the embedded metal piece 41 arranged in the storage area, the bolt hole 35 of the storage stand 8 is inserted into the true of the fixing female screw 42 of the embedded metal piece 41. It is necessary to put on.

  In the first embodiment, when the vehicle enters the storage area from the traveling area and approaches the stationary position, the operation function is not concentrated on the controller connected to the rear drive unit, and the rear drive unit 11 and the front drive unit are stopped. The device 13 switches to independent control by the respective controllers 12 and 14.

  The front drive unit 13 is operated so that the positioning guide pin 29 at the tip of the air cylinder of the positioning guide pin driving mechanism 28 is almost directly above the guide pin insertion hole 43A of the embedded metal 41.

  Next, the positioning guide pin 29 is inserted into the guide pin insertion hole 43A. The distal end of the positioning guide pin 29 is formed in a conical shape so that the positioning guide pin 29 can be inserted even if the center of the positioning guide pin 29 is slightly deviated from the center of the guide pin insertion hole 43A. When the positioning guide pin 29 is inserted into the guide pin insertion hole 43A, the compressed air of the actuator that has pressed the drive wheel 4A of the front drive device 13 against the ground is removed, and the drive wheel 4A is floated from the ground.

  Thereafter, the direction of the driving wheel 4 of the rear driving device 11 is 90 degrees with respect to the line connecting the front positioning guide pin 29 and the rear driving wheel 4, and the front end of the rear positioning guide pin 29A is behind the embedded metal 41. The rear drive unit 11 is operated so as to be almost directly above the guide pin insertion hole 43.

  Next, after the positioning guide pin 29A is inserted into the guide pin insertion hole 43, the compressed air from the airbag 21 is extracted to lower the cask transport base 1 and the cask transport base 1 is pulled out from the storage base 8, and the front drive unit 13 is pulled out. Is removed from the storage stand 8 and reattached to the side of the driving device 3 of the cask carrier 1.

  Finally, the fixing bolt 38 is screwed into the female screw 42 of the embedded metal 41 to fix the storage stand 8.

  After the storage stand is fixed, the transport device reverses the storage area and the traveling area by the back operation, and returns it to the waiting place in the receiving inspection area.

  The front drive unit is provided with at least three casters so that an operator can remove it from the storage stand 8 and attach it to the rear drive unit 11 alone.

  FIG. 13 is a view showing a state of installation of air supply pipes in a spent fuel storage cask transport system according to the present invention in an intermediate storage facility. FIG. 13 shows a building structure of a storage facility 51 having six storage areas in which storage caskes are arranged in five columns and six rows. However, the internal structure of the receiving inspection area 52 is not shown in detail because it is not necessary for understanding the present invention.

  A partition door 55 is provided at the boundary between the storage area 54 and the receiving inspection area 52. A traveling area 53 is arranged in the center of the storage area. The cask carrier 1 conveys the storage cask 7 placed on the storage rack 8 using an overhead crane in the receiving inspection area. There is a considerable distance from the receiving inspection area to the end of the storage area.

  The hose reel 15 provided on the cask carrier 1 can wind only the air hose 16 having a length of several tens of meters. Therefore, it is necessary to install a compressed air pipe 58 that can supply compressed air in the middle of the traveling area of the storage facility 51. The compressor 56 of the compressed air source and the accumulator 57 of the air reservoir are arranged outside the storage facility or in the receiving inspection area.

  A compressed air pipe 58 from the accumulator 57 is installed in the ground of the traveling area from the receiving inspection area or on the ground. Air supply ports to the cask carrier 1 are provided in at least one place in the receiving inspection area and in a plurality of places in the traveling area. There are two types of air supply port diameters.

  FIG. 14 is a diagram showing an installation state of an air supply port in a spent fuel storage cask transport system according to the present invention in an intermediate storage facility.

  As already described, since the air hose 16 cannot be so long as to cover the entire length of the storage facility, it is necessary to connect the air hose 16 to the compressed air pipe 58 in the middle of the traveling area. In other words, when the cask carrier 1 that has traveled from the acceptance inspection area 52 to the traveling area 53 extends all the air hose 16 from the hose reel 15, the cask carrier 1 cannot move forward. Must be rewound.

  However, once the air hose 16 is removed from the compressed air pipe 58, compressed air is no longer supplied to the air motor 17 that drives the hose reel 15, so another compressed air supply route must be provided.

  Accordingly, small-diameter air supply ports 62 and 63 for driving the hose reel are provided along with large-diameter air supply ports 59, 60, and 61 for airbags and drive wheels at several intermediate points of the traveling area 53. In addition, the cask carrier 1 can be connected to a large-diameter air hose 16 that is slightly longer than the distance between the intermediate points, and a small-diameter short air hose 66 that connects the airbag and the small-diameter air supply port at the intermediate point. To do.

  The air motor 17 for driving the hose reel is configured so that compressed air can be supplied from either the large-diameter air supply port or the small-diameter air supply port, and the air hose is wound when the cask carrier 1 reaches the intermediate point. Make it take.

  As shown in FIG. 10, the positioning guide pin 29 at the tip of the pneumatic cylinder of the positioning guide pin driving mechanism 27, 28 is inserted into the guide pin insertion holes 43, 43A even if their centers are slightly deviated. Basically, it should be conical. In this case, the counterpart guide pin insertion holes 43 and 43A are simple drill holes.

  FIG. 15 is a side view showing the relationship between the positioning guide pin driving mechanism of the storage frame and the guide pin insertion hole of the embedded metal.

  As another structure, the tip of the positioning guide pin 29 has a truncated cone shape, and the guide pin insertion holes 43 and 43A are simple drill holes. In this structure, the tip diameter of the positioning guide pin 29 is several mm smaller than the diameter of the guide pins 43 and 43A.

  Even if the positioning accuracy is poor, the positioning guide pin 29 is moved to the position where the guide pin insertion holes 43 and 43A substantially coincide with each other, and the positioning guide pin 29 is inserted into the guide pin insertion holes 43 and 43A by the air cylinder. As the result, the positioning guide pin 29 enters the guide pin insertion holes 43 and 43A.

  At this time, when the tip of the positioning guide pin 29 slightly enters the guide pin insertion holes 43 and 43A, the compressed air of the air actuator that presses the driving wheel of the front driving device and the driving wheel of the rear driving device against the ground is temporarily removed. Therefore, when the positioning guide pin 29 is pushed into the guide pin insertion holes 43 and 43A, the cask carrier 1 can be easily displaced and the positioning guide pin 29 can be pushed.

  FIG. 16 is a side view showing the relationship between the positioning guide pin driving mechanism of the storage frame and the guide pin insertion hole of the embedded metal.

  Contrary to FIG. 15, as shown in FIG. 16, a structure in which the tip of the positioning guide pin 29 has a simple cylindrical shape and the guide pin insertion holes 43 and 43A have a truncated cone shape is also possible.

  FIG. 17 is a side view showing the structure of the front / rear drive device in the spent fuel storage cask transport system according to the present invention, and FIG. 18 shows the front / rear structure in the spent fuel storage cask transport system according to the present invention. It is a top view which shows the structure of a rear part drive device.

  In the base 71 of the driving device, a disc-like member 72 that is rotatable around the rotation shaft 84 by the first air motor 80 via the speed reducer 81 is disposed, and a chain or a timing belt or the like 76 is formed by the second air motor 73 and the air motor. A plate-like member 74 provided with a driving wheel 78 rotated via a disk is attached to a disk-like member 72 via linear guides 79 provided at least at two locations, and between the plate-like member 74 and the disk-like member 72. An air actuator 83 is arranged so that the driving wheel can be pressed against the floor surface.

  In particular, the drive wheel 78 is arranged at the center of rotation of the disk-like member 72 so that when the direction of the drive wheel 78 is changed, the cask carrier 1 does not change its position or angle with respect to the ground.

    With such a structure, after the front positioning guide pin 29 is inserted into the guide pin insertion hole 43 of the embedded metal 41, the rear driving is performed with respect to the line connecting the front positioning guide pin 29 and the rear driving wheel 4. When the direction of the drive wheels 4 of the device 11 is changed to be orthogonal, there is an advantage that no load other than supporting the rotational force acts on the front positioning guide pins 29.

  In FIG. 18, a plate-like member 74 provided with drive wheels 78 is attached to a disk-like member 72 through four linear guides 79, an air actuator 83 is disposed, and the drive wheels 78 are moved up and down with respect to the floor surface. I was able to do it.

  When the plate-like member 74 is hinged and moved up and down by a rotating action and pressed against the ground as in the conventional case, the tip of the positioning guide pin 29 slightly enters the guide pin insertion holes 43 and 43A. Once the compressed air of the air actuator that presses the driving wheel of the front driving device and the driving wheel of the rear driving device against the ground is released, the wheel rotates relative to the hinge pin and the horizontal position moves. Excessive load is applied. In some cases, the positioning guide pins 29 are damaged.

  On the other hand, in the present invention, a structure is adopted in which the driving wheel 78 can be moved only in the vertical direction by the linear guide 79 and a horizontal load does not act on the positioning guide pin 29. As the second air motor 73 for rotating the driving wheel 78, a piston type is desirable from the viewpoint of driving force and braking performance among the vane type and the piston type.

  FIG. 19 is a plan view showing a configuration of a second embodiment of the spent fuel storage cask transport system according to the present invention.

  The cask carrying table 1 of the second embodiment has two cask carrying tables 100 that are arranged in parallel and grip the storage rack 115, a coupling member 101 that couples the two cask carrying tables 100, and an air motor to generate rotational force. Drive devices 102 and 104 are provided which are applied to the wheels and horizontally moved as a whole.

  Two driving devices 102 and 104 are provided symmetrically with respect to the center of the cask carrier 1 and can be individually attached and detached. Both of the driving devices 102 and 104 can be attached to and detached from the right front or left front of the storage stand 115 according to the position where the storage stand 115 is placed in the storage area.

  Although not shown in detail, the left and right drive devices 102 and 104 can be attached to and detached from the coupling member 101 or the storage stand 115 by operating the one-touch handles 103 and 105. Two wheels 109 for moving when no load is applied are provided at the tip of the cask carrier 100. The compressed air supply hose reel 106 is driven by an electric motor by a battery 107. FIG. 19 shows a state in which both the left and right drive devices 102 and 104 are attached to the coupling member 101, and is not a diagram showing an actual conveyance state.

  FIG. 20 is a plan view showing a state of a spent fuel storage cask transport system with a front drive device mounted on the left side surface.

  FIG. 20 shows the state of the spent fuel storage cask transport system when transporting when there is a column or wall on the right side in the traveling direction in the storage area 54 as shown in FIG. When there is a wall on the right side in the traveling direction, the left driving device 102 is attached via an attachment hook 112 provided on the left front side of the storage stand 115.

  A controller 108 for controlling the entire spent fuel storage cask transport device is provided at the rear of the main body, but an independent controller 116 can be attached to the left drive device 102. A positioning guide pin driving mechanism 113 as shown in FIG. 15 is attached to the right front end of the storage stand 115, and another positioning guide pin driving mechanism 114 is attached to the left rear.

  In this case, when the operator having the controller 116 approaches the spent fuel storage cask transport device to the final stop position, the operator 116 is positioned at the right front of the storage stand 115 and the guide pin of the positioning guide pin drive mechanism 113. The cask carrier 1 is moved precisely by operating the controller so that the front end of the guide is substantially coincident with the center of the guide pin insertion holes 43 and 43A of the embedded metal 141.

  When the guide pin of the positioning guide pin driving mechanism 113 is completely inserted into the guide pin insertion hole of the embedded metal 141, the operator having the controller 108 changes the direction of the driving wheel of the right driving device 104 to the positioning guide pin driving mechanism 113. The direction of the driving wheel is changed so as to be orthogonal to a line connecting the guide pin and the driving wheel of the right driving device 104.

  Next, the cask carrying table 1 is moved to the left rear of the storage stand 115 and the cask carrier 1 is positioned so that the guide pin of the left rear positioning guide pin driving mechanism 114 substantially coincides with the center of the guide pin insertion hole of the embedded metal 141. The pin driving mechanism 113 is rotated around the guide pin.

  When the center of the guide pin substantially coincides with the center of the guide pin insertion hole, the controller 108 removes the compressed air from the drive wheel actuator of the cask carrier 1 so that the cask carrier 1 is left floating and the movement is free. Then, compressed air is fed into the air cylinder of the positioning guide pin driving mechanism 114 to completely insert the guide pin into the guide pin insertion hole of the embedded metal 141. Next, the left driving device 102 and the positioning guide pin driving mechanisms 113 and 114 are removed from the storage stand 115. Thereafter, the entire compressed air of the airbag 110 is removed to lower the entire cask carrier 1 and the right drive attached to the rear of the main body is operated to draw the cask carrier 1 from the storage stand 115. Finally, the fixing bolt is inserted into the bolt hole opened in the storage stand 115 and fastened to the female screw of the embedded metal 141.

  FIG. 21 is a plan view showing a state of a spent fuel storage cask transport system with a front drive device mounted on the right side surface.

  In the storage area 54, if there is a column or wall on the left side in the traveling direction, the storage stand 115 is placed by performing the same operation as in FIG.

  22 is a right side view of the spent fuel storage cask transport system of FIG.

  A hose reel 106 is provided on the rear table of the cask transfer table 1. In the lower part of the left drive device 102 and the right drive device 104, in addition to the drive wheels 4 and 4A, as an auxiliary device for moving the drive device from the main body to the front of the storage frame, or moving from the storage frame to the main body, A plurality of casters 121 and 122 are provided.

  23 to 28 are diagrams showing another positioning mechanism.

  FIG. 23 is a plan view showing a configuration of a storage gantry in Embodiment 3 of the spent fuel storage cask transport system according to the present invention.

  As shown in FIG. 23, V block-shaped members 131, 132, and 133 are attached to the left and right two locations on the front side of the storage stand 115 or three locations including the central portion.

  FIG. 24 is a plan view showing another embodiment of the positioning guide groove of the storage stand, and FIG. 25 is a plan view showing another embodiment of the positioning guide groove of the storage stand.

  FIG. 24 shows a V-block member 133 having a V-shaped recess or groove when viewed from above, and FIG. 25 is rounded at the bottom of the V-shaped recess or groove when viewed from above. A V-block-shaped member 133 is shown.

  FIG. 26 is a plan view showing the structure of another embodiment of the embedded metal 141 according to the present invention.

  Ten embedded screws 142 for fixing the storage stand 115 are formed in the embedded metal 141. A female screw 143 is formed at a position corresponding to the center position of the V groove of the V block member 133 on the front side of the embedded metal 141, and at least two cylindrical positioning guide pins 143 are attached to the female screw 143. Here, three are attached.

  27 is a cross-sectional view showing the structure of the embedded metal fitting of FIG.

  A number of fixing studs 144 are provided on the side of the embedded metal 141 embedded in the floor concrete. A positioning guide pin 143 can be attached in front of the embedded metal 141.

  FIG. 28 is a view showing the structure of positioning guide pins in the spent fuel storage cask transport system according to the present invention.

  Since the guide pin 143 is used only when the storage frame 115 is transported to the storage area and placed on a predetermined embedded metal 141, a screw is processed at the base, and the guide pin 143 can be attached to and detached from the embedded metal 141. The side of the side is provided with a rotating spanner seat.

A method for operating the cask carrier 1 when the V-block member 133 is used will be described. In the traveling area of the storage facility, the cask carrier 1 controls the rear drive unit 3 and the front drive unit 13 as a unit, enters the storage area, and immediately before the fixed position, the rear drive unit 3 and the front drive unit 13. First, the front drive unit moves the two or three guide pins provided in the embedded metal fitting 141 so as to enter the grooves of the three V blocks attached to the front of the storage rack. ,
Next, the actuator that pushes the drive wheel of the front drive unit against the floor is evacuated to float the drive wheel in the air, and then the rear drive unit is used to place two or three guide pins on each V block. Move to fix at the bottom of the groove. After the insertion of the guide pin into the bottom of the V block groove is completed, the air of the actuator that presses the driving wheel of the rear driving device against the floor surface is removed to float the driving wheel in the air.

  The air of the airbag is evacuated, and the storage stand 8 is seated on the embedded metal 141. Finally, tighten the storage stand fixing bolts.

  In the operation of the cask carrier 1, after fixing the storage stand 115 by tightening the fixing bolt to the embedded metal 141, when returning to the standby place in the receiving inspection area 52, the front drive unit is removed from the storage stand 115, In the arrangement as shown in FIG.

  In the receiving inspection area, after the storage rack 8 is placed on the cask carrier 1 by the overhead crane, it is conveyed to a predetermined position as follows.

  In traveling from the receiving inspection area, a large-diameter air hose is connected to the first air supply port 59 provided near the entrance of the storage area to start traveling. In the central passage of the storage facility, the hose reel 15 is matched to the traveling speed. , The air hose 16 is pulled out, and when the air hose 16 comes to the vicinity of the second air supply port 60 provided at the intermediate point of the conveyance path and the small-diameter air supply port 62 for driving the hose reel, the travel is stopped once and the large-diameter air hose 16 is stopped. Is removed from the first air supply port 59.

  A small-diameter air hose 18 for driving the hose reel is connected to the air supply port and the hose reel 15 is rotated to wind up the air hose 16. When the winding is completed, the large-diameter air hose 16 is connected to the second air supply port 60. The small-diameter air hose 18 is removed from the air supply port 62.

  Next, the traveling is started again. This operation is repeated and finally it is made to travel to the place where a storage stand is installed. When returning to the standby place after the storage stand is installed, the air hose 16 is connected in reverse order to travel.

It is a side view which shows schematic structure of the cask conveyance system for spent fuel storage by this invention. It is a perspective view which shows schematic structure of the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the structure of Example 1 of the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the state which mounted the storage stand on the cask conveyance system for spent fuel storage with which the front part drive device was mounted | worn on the right side surface. It is a right view of the cask conveyance system for spent fuel storage of FIG. It is a top view which shows the state which mounted the storage stand on the cask conveyance system for spent fuel storage with which the front part drive device was mounted | worn on the left side surface. It is a top view which shows the method of placing a storage stand in a storage area by the spent fuel storage cask conveyance system which attached the front drive unit to the right side surface. It is a top view which shows the method of placing a storage stand in a storage area by the spent fuel storage cask conveyance system which attached the front part drive device to the left side surface. It is a top view which shows the attachment position of the positioning guide pin drive mechanism to a storage stand. It is a side view which shows the relationship between the positioning guide pin drive mechanism of a storage stand, and the guide pin insertion hole of an embedded metal. It is a top view which shows the structure of one Example of the embedded metal object by this invention. It is sectional drawing which shows the structure of the embedding | fitting metal of FIG. It is a figure which shows the installation condition of the piping for air supply to the cask conveyance system for spent fuel storage by this invention in an intermediate storage facility. It is a figure which shows the installation condition of the air supply port to the cask conveyance system for spent fuel storage by this invention in an intermediate storage facility. It is a side view which shows the relationship between the positioning guide pin drive mechanism of a storage stand, and the guide pin insertion hole of an embedded metal. It is a side view which shows the relationship between the positioning guide pin drive mechanism of a storage stand, and the guide pin insertion hole of an embedded metal. It is a side view which shows the structure of the front part / rear part drive device in the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the structure of the front part / rear part drive device in the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the structure of Example 2 of the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the state of the cask conveyance system for spent fuel storage which attached the front drive device to the left side surface. It is a top view which shows the state of the cask conveyance system for spent fuel storage which attached the front drive device to the right side surface. It is a right view of the cask conveyance system for spent fuel storage of FIG. It is a top view which shows the structure of the storage stand in Example 3 of the cask conveyance system for spent fuel storage by this invention. It is a top view which shows the other Example of the positioning guide groove of a storage stand. It is a top view which shows another Example of the positioning guide groove of a storage stand. It is a top view which shows the structure of the other Example of the embedded metal object by this invention. It is sectional drawing which shows the structure of the embedding | fitting metal of FIG. It is a figure which shows the structure of the positioning guide pin in the cask conveyance system for spent fuel storage by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cask conveyance stand 2 Air bag 3 Rear drive device 4 Drive wheel 5 Air hose 6 Compressed air source 7 Storage cask 8 Storage stand 9 Trunnion 11 Rear drive device 12 Controller 13 Front drive device 14 Controller 15 Hose reel 16 Large diameter air hose 17 Hose reel drive air motor 18 Air hose 21 Air bag 22 Storage stand positioning plate 23 No load wheel 27, 28 Positioning guide pin drive mechanism 29 Positioning guide pin 31, 32 Column 33, 34 Wall 35 Bolt hole 38 Bolt 41 Embedded metal 42 Storage frame fixing female screw 43 Positioning guide pin insertion hole 44 Stud 45 Reinforced concrete floor 51 Storage facility 52 Reception inspection area 53 Traveling area 54 Storage area 55 Partition door 56 Compressor 57 Air reservoir 58 Compressed air piping 5 , 60, 61 Large-diameter air supply port 62, 63 Small-diameter air supply port 66 Small-diameter air hose 71 Base 72 Disc-like member 73 Air motor 74 Plate-like member 75 Pulley 76 Timing belt 77 Pulley 78 Drive wheel 79 Linear guide 80 Air motor 81 Deceleration Machine 82 Rotary encoder 83 Air actuator 84 Rotating shaft 100 Cask carrier 101 Connecting member 102 Left drive device 103, 105 One-touch handle 104 Right drive device 106 Hose reel 107 Battery 108 Controller 109 Wheel 110 Air bag 111, 112 Drive device hook 113, 114 Positioning guide pin drive mechanism 115 Storage stand 116 Controller 121, 122 Moving casters 131, 132, 133 V-block-shaped member 141 Embedded metal 142 Screw 143 Guide pin 144 Stud

Claims (19)

In a spent fuel storage cask transport system that fixes and transports a metal cask containing spent fuel to a storage stand,
A cask carrying table equipped with a plurality of airbags for loading the storage frame and arranged in parallel;
A rear drive unit that is fixed to the rear part of the cask carrier and moves the storage frame horizontally by an air motor;
A spent fuel storage cask transport system comprising: a front drive device attached to a front side portion of the storage stand and horizontally moving the storage stand by an air motor. The spent fuel storage cask transport system according to claim 1,
The spent fuel storage cask transport system, wherein the front drive device includes an attachment / detachment mechanism to either the left or right front corner portion of the storage rack according to a fixed position of the cask. In a spent fuel storage cask transport system that fixes and transports a metal cask containing spent fuel to a storage stand,
A cask carrying table equipped with a plurality of airbags for loading the storage frame and arranged in parallel;
Two drive devices that can be attached / removed on either the left or right rear of the cask carrier and the front left or right of the storage stand;
When placing the cask near the right wall, attach the front drive device to the front left side of the storage rack, attach the rear drive device to the rear right side of the cask carrier,
When the cask is placed near the left wall, a front drive device is attached to the front right side of the storage rack, and a rear drive device is attached to the rear left side of the cask carrier. Storage cask transport system. The spent fuel storage cask transport system according to any one of claims 1 to 3,
When traveling in the traveling area of the storage facility, the rear drive device and the front drive device are integrally controlled, and when entering the storage area and performing fine operations, the rear drive device and the front drive device A spent fuel storage cask transfer system comprising at least two controllers for independently controlling the fuel. The spent fuel storage cask transport system according to any one of claims 1 to 4,
A spent fuel storage cask transport system, wherein the detachable drive device comprises at least three moving casters. In the spent fuel storage cask transport system according to any one of claims 1 to 5,
A spent fuel storage cask transport system, comprising at least six airbags having a capacity capable of sharing the load of the cask to be loaded and the storage stand by four. The spent fuel storage cask transport system according to any one of claims 1 to 6,
A spent fuel storage cask transport system comprising: an air hose that supplies compressed air that drives the airbag and the air motor; and a hose reel that has an air motor or an electric motor for winding and unwinding the air hose. . The spent fuel storage cask transport system according to claim 7,
A plurality of large-diameter air supply ports for the airbag and the air motor and a small-diameter air supply port for driving the hose reel are provided at an intermediate point of the conveyance path, and the conveyance is performed with a large-diameter air hose slightly longer than the distance between the intermediate points. A spent fuel storage cask transport system, wherein the transport system is connected to the large-diameter air supply port, and the transport system and the small-diameter air supply port are connected by a short small-diameter air hose at an intermediate point. . The spent fuel storage cask transport system according to claim 7 or 8,
The air motor for winding / unwinding the air hose is driven by compressed air supplied from either a large-diameter air supply port or a small-diameter air supply port provided in the storage facility, and the cask transport table reaches an intermediate point. A spent fuel storage cask transport system that winds up the large-diameter air hose when the fuel is stored. The spent fuel storage cask transport system according to any one of claims 1 to 9,
A spent fuel storage cask transport system comprising positioning guide pin drive mechanisms at diagonal positions before and after the storage stand. The spent fuel storage cask transport system according to claim 10,
A positioning guide pin drive mechanism comprises a positioning guide pin of the storage frame to a buried concrete of a storage facility floor concrete, and an air actuator or a hydraulic actuator that drives the positioning guide pin. Cask transport system. The spent fuel storage cask transport system according to claim 11,
A spent fuel storage cask conveying system, wherein the positioning guide pin drive mechanism has a conical or frustoconical positioning guide pin attached to the shaft tip of the actuator. The spent fuel storage cask transport system according to any one of claims 10 to 12,
On the floor where the storage stand of the storage facility is placed, the embedded metal fittings are arranged in a substantially square shape, and the storage stand is attached to the left and right side embedded metal fittings in the traveling direction of the spent fuel storage cask transport system. A spent fuel storage cask transport system, wherein at least four female screws for fixing with bolts are opened, and one positioning hole is formed in each of the left and right projecting portions of the front and rear embedded metal parts. The spent fuel storage cask transport system according to any one of claims 1 to 9,
V block-shaped members are provided at at least two locations on the left and right sides of the storage platform to be loaded,
A female screw is formed at a position corresponding to the center position of the V block in an approximately B-shaped embedded metal placed on the floor surface, and a cylindrical guide pin is attached to the female screw.
A spent fuel storage cask transport system, wherein at least two V-block members of the storage stand and the cylindrical guide pins are brought into contact with each other to place the storage stand. The spent fuel storage cask transport system according to any one of claims 1 to 15,
The rear drive device and the front drive device are a steering device that changes a traveling direction, a drive wheel that drives the storage frame by an air motor, and the drive wheel that is placed on the floor surface to transmit the driving force of the air motor to the floor surface. A spent fuel storage cask transport system comprising an actuator for pressing. The operation method of the spent fuel storage cask transport system according to claim 11,
In the traveling area of the storage facility, the rear drive device and the front drive device are controlled as a unit,
In the storage area, the rear drive device and the front drive device are independently controlled immediately before the stationary position,
The front positioning guide pin attached to the front of the storage frame by the front drive device is moved so as to substantially coincide with the front guide hole center of the embedded metal,
Insert the front positioning guide pin into the front guide hole with the air cylinder,
After the insertion is completed, the actuator that pushes the driving wheel of the front driving device against the floor is vented,
The direction of the driving wheel of the rear drive device is rotated by 90 degrees with respect to the front guide pin, and the rear guide pin is moved so as to substantially coincide with the center of the rear guide hole of the embedded metal,
Insert the rear positioning guide pin into the rear guide hole by air cylinder,
After the insertion is completed, the actuator pressing the driving wheel of the rear driving device against the floor surface is vented,
Evacuating the air bag and seating the storage rack on the embedded metal;
A method for operating a spent fuel storage cask transport system, wherein a fastening bolt of the storage stand is tightened. The operation method of the spent fuel storage cask transport system according to claim 14,
In the traveling area of the storage facility, the rear drive unit and the front drive unit are controlled as a unit,
In the storage area, the rear drive device and the front drive device are independently controlled immediately before the stationary position,
The front drive device moves at least two guide pins provided in the embedded metal so as to enter the groove of each V block attached to the front of the storage frame,
The air of the actuator that presses the driving wheel of the front driving device against the floor surface is vented,
Using the rear driving device, at least two guide pins are moved so as to be fixed to the groove bottom of each V block,
After the insertion of the guide pin into the bottom of the V block groove is completed, the air of the actuator that presses the driving wheel of the rear driving device against the floor surface is vented,
Evacuating the air bag and seating the storage stand on the embedment;
A method for operating a spent fuel storage cask transport system, wherein a fastening bolt of the storage stand is tightened. The operation method of the spent fuel storage cask transportation system according to claim 16 or 17,
After the storage stand is fixed to the embedded metal by tightening a fixing bolt, a front drive unit is detached from the storage stand, attached to the cask transfer stand, and returned to a standby place. Method of operating cask transport system. The operation method of the spent fuel storage cask transport system according to any one of claims 16 to 18,
When running from the acceptance inspection area, start running by connecting a large-diameter air hose to the first air supply port provided near the entrance of the storage area,
In the central passage of the storage facility, rotate the hose reel according to the traveling speed and pull out the air hose.
When it comes to the vicinity of the second air supply port provided at the intermediate point of the conveyance path and the small-diameter air supply port for driving the hose reel, the travel is temporarily stopped.
Remove the large-diameter air hose from the first air supply port, connect the small-diameter air hose for driving the hose reel to the air supply port, rotate the hose reel, and wind up the hose reel.
When winding is complete, connect the large-diameter air hose to the second air supply port, disconnect the small-diameter air hose from the air supply port, and start running again.
Repeat this work and finally run to the place where the storage stand is installed,
A method for operating a spent fuel storage cask transport system, wherein the air hose is connected and traveled in the reverse procedure when returning to the standby position after installing the storage stand.

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