JP4183404B2 - How to move the cask - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cask moving device and a moving method for moving a cask containing a nuclear fuel assembly, and more specifically, a cask capable of moving a cask even in a place where there is no dedicated moving path. The present invention relates to a moving device and a moving method.
[0002]
[Prior art]
Spent fuel assemblies generated at a nuclear power plant are stored in a predetermined number of bodies in a special cylindrical container called a cask. That is, as shown in FIG. 10, the cask 8 is arranged vertically in a predetermined location of the nuclear power plant, and the long nuclear fuel assembly 14 is lifted by the fuel lifting crane after the upper cover 13 is removed. However, it is stored by being suspended in a predetermined storage hole in the cask 8.
[0003]
As described above, the cask 8 in which the nuclear fuel assembly 14 is stored in the nuclear power plant is suspended by a crane after the upper lid 13 is attached, and is loaded on a loading platform of a dedicated trailer while being horizontally placed. In this way, the cask 8 loaded on the loading platform of the dedicated trailer is further firmly fixed so that it does not collapse even when the dedicated trailer is moving. Thereafter, the cask 8 is transported to the cask storage building by this dedicated trailer.
[0004]
As shown in FIG. 11, the cask storage building is provided with an overhead crane 15, and the cask 8 carried into the building by the dedicated trailer 16 is suspended vertically by the overhead crane 15 one by one. It is moved to a predetermined storage location.
[0005]
The cask 8 that has been moved to a predetermined storage location in the cask storage building in this manner is stored in the cask with the nuclear fuel assembly 14 stored therein until the stored nuclear fuel assembly 14 is used for reprocessing. Stored in the storage building.
[0006]
[Problems to be solved by the invention]
However, such a conventional cask moving method has the following problems.
[0007]
That is, in such a conventional cask moving method, the arrangement state of the cask 8 is frequently changed. That is, the nuclear fuel assembly 14 is stored in a vertically placed state at a nuclear power plant, then changed to a horizontally placed state and loaded on a dedicated trailer 16, and further changed to a vertically placed state again in a cask storage building.
[0008]
By the way, the cask 8 houses the nuclear fuel assembly 14 therein, and the acceleration imposed when moving is regulated. Therefore, when moving by the dedicated trailer 16, the speed must be limited so as not to give significant acceleration to the cask 8.
[0009]
For this reason, the cask 8 is paid out from the nuclear power plant and it takes a lot of time and labor to move the cask storage building to a predetermined storage location, and there is a problem that the transfer efficiency is extremely poor. However, the road from the nuclear power plant to the cask storage building must be relied on by the dedicated trailer 16 as described above because there are rough roads with poor road surface conditions.
[0010]
The present invention has been made in view of such circumstances, and even when there is rough terrain in the middle of the cask movement path, the cask is placed in the vertical state without being changed to the horizontal state in the middle. An object of the present invention is to provide a cask moving device and a moving method that can move the cask without giving significant acceleration and thus increase the moving efficiency.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following measures.
[0020]
The invention of claim 1 is a cask moving method for moving a cask fixed on a gantry equipped with an air pallet and containing a nuclear fuel assembly, the movement for moving the air pallet to which the cask is fixed The first step of laying the moving path forming flat plate forming the road on the irregular ground in the moving direction, and after placing the mount on the moving moving path forming flat plate, gas is supplied to the air pallet. Supplying a buoyancy to the gantry by the gas ejected from the air pallet toward the road surface of the moving path, and the buoyancy causes the gantry to move to the end of the flat plate along the moving path forming plate; When the platform has moved to the end of the flat plate, the third step of lifting the platform and preventing the platform from applying a load to the moving path forming plate and moving the moving path forming plate in the moving direction Let the fourth step of laying on uneven ground, and after placing the pedestal on the laid moving path forming flat plate, supply gas to the air pallet, and from the air pallet toward the road surface of the moving path The buoyancy is applied to the gantry by the jetted gas, and the buoyancy includes the fifth step of moving the gantry along the moving path forming flat plate to the flat plate end side. Then, after the fifth step, the gantry is moved along the moving path by repeating the third and fourth steps.
[0021]
There has been the above-mentioned problem with respect to moving the cask containing the nuclear fuel assembly inside the nuclear power plant and moving it to a predetermined storage location in the cask storage building. For example, the cask containing the nuclear fuel assembly can be moved without hindrance , and the moving path forming plate can be moved like a scale insect, so that the moving path forming plate can be laid even in a narrow place. It becomes possible.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the implementation of the embodiment of the present invention, together with the study example discussed by the present inventors relates to the present invention will be described with reference to the drawings.
[0023]
In addition, the code | symbol in the figure used for description of the following examination example 1 and one Embodiment attaches | subjects and shows the same code | symbol about the same part as FIGS. 10-11.
[0024]
( Study Example 1 ) A study example 1 studied by the present inventors in connection with the present invention will be described with reference to FIGS.
[0025]
FIG. 1 is a configuration diagram illustrating an example of the overall configuration of a cask moving apparatus to which the cask moving method according to Study Example 1 is applied.
[0026]
In other words, the cask moving device to which the cask moving method according to Study Example 1 is applied has a plurality of moving path formations as shown in the perspective view shown in FIG. 1 (a) and the elevation view shown in FIG. 1 (b). The cask moving path (moving direction is indicated by an arrow in the figure) formed by connecting the flat plates 1 for use in a line, the upright view of FIG. 2 (a), and the plan view of FIG. 2 (b). Thus, the cask 8 is fixed in a vertically placed state, and the moving pallet 2 moves on the moving path.
[0027]
As shown in FIG. 3, the moving path forming flat plate 1 includes height adjusting tools 5 used by jacks or the like at least at four corners thereof. The height adjuster 5 adjusts the heights of the four corners of the moving path forming flat plate 1 laid on the laying surface 3 to keep the moving path, that is, the upper surface of the moving path forming flat plate 1 horizontal. Is. Further, the heights of the movement path forming flat plates 1 laid adjacent to each other are adjusted so as not to cause a step.
[0028]
Further, as shown in FIG. 3, the moving path forming flat plate 1 includes a moving path forming auxiliary flat plate 4 on one end side thereof. The movement path forming auxiliary flat plate 4 is a plate constructed on the end side of the adjacent movement path forming flat plates 1 so as to cover the gap 6 between the adjacent movement path forming flat plates 1. The moving path forming auxiliary plate 4 provided on the moving path forming flat plate 1 shown as an example in FIG. 3 is movable. Such a movement path forming auxiliary flat plate 4 is held in a state as shown in FIG. 3A until the movement path forming flat plate 1 is laid on the laying surface 3 and the height adjustment is completed. When the height adjustment is finished, the gap between the moving path forming flat plate 1 provided by itself and the adjacent moving path forming flat plate 1 is tilted as shown in FIG. 3B. 6 so as to cover the end portions of adjacent moving path forming flat plates 1 so as to cover 6.
[0029]
As shown in FIG. 2, the moving pallet 2 is provided with two air pallet insertion ports 9 at the lower portion, and when moving the cask 8, the air pallet 10 is inserted into the air pallet insertion port 9. That is, the air pallet 10 is detachable, and when the movement of the cask 8 is completed, the air pallet 10 is extracted from the air pallet insertion port 9 and used for another pallet 2 for movement. .
[0030]
Each air pallet 10 includes two diaphragms 11 as shown in FIG. 2 (b), and supplies compressed air to the diaphragms 11 by a hose or the like from a compressed air supply pump (not shown). Then, the supplied compressed air is ejected from the diaphragm 11 toward the floor surface, thereby giving buoyancy to the moving pallet 2. This buoyancy reduces the static friction coefficient of the moving pallet 2 on which the cask 8 is placed to about 1/1000.
[0031]
By covering the gap 6 with the moving path forming auxiliary flat plate 4, the moving pallet 2 is moving on the moving path forming flat plate 1 while operating the air pallet 10 as shown in FIG. In this case, the buoyancy is maintained because the compressed air G ejected from the air pallet 10 toward the upper surface of the moving path forming flat plate 1 does not leak from the gap 6. If there is no moving path forming auxiliary flat plate 4, as shown in FIG. 4B, the compressed air G ejected from the air pallet 10 toward the upper surface of the moving path forming flat plate 1 passes through the gap 6. As a result of leakage, the buoyancy of the moving pallet 2 is reduced, causing movement difficulties.
[0032]
The movement path forming auxiliary flat plate 4 is not necessarily provided on the end side of the movement path forming flat plate 1. For example, an iron plate may be used as the movement path forming auxiliary flat plate 4. When an iron plate is used as the movement path forming auxiliary flat plate 4 as described above, the movement path forming flat plate 1 is first laid on the laying surface 3 as shown in FIG. After adjusting the height, the iron plate 12 may be placed so as to cover the gap 6 as shown in FIG.
[0033]
In this way, a moving path that enables efficient movement by the air pallet 10 is formed using the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4.
[0034]
It is preferable that the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 have a number corresponding to the moving distance of the moving pallet 2. However, since the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 can be laid / removed as described above, the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 can move to the moving distance at a time. Even when the corresponding movement path cannot be formed, the movement path forming flat plate 1 and the movement path forming auxiliary flat plate 4 through which the movement pallet 2 has passed are removed, and the removed movement path forming flat plate 1 is removed. Further, by arranging the movement path forming auxiliary flat plate 4 at the tip in the movement direction and continuously forming the movement path, even when moving a long distance, the movement path is extended to the destination. The moving pallet 2 can be moved.
[0035]
Next, the operation of the cask moving apparatus to which the cask moving method according to Study Example 1 configured as described above is applied will be described with reference to the flowchart shown in FIG.
[0036]
That is, when the cask 8 is moved by the cask moving device to which the cask moving method according to the study example 1 is applied, first, a plurality of moving path forming flat plates 1 are laid in a row on the laying surface 3 (S1). .
[0037]
As shown in FIG. 3, each movement path forming flat plate 1 is provided with height adjusting tools 5 using jacks or the like at least at four corners thereof. 3, the height adjustment tool 5 adjusts the heights of the four corners, thereby keeping the upper surface of the moving path forming flat plate 1 horizontal. Further, the heights of the movement path forming flat plates 1 laid adjacent to each other are adjusted so as not to cause a step (S2).
[0038]
Next, the moving path forming auxiliary flat plate 4 provided on one end side of the moving path forming flat plate 1 is installed so as to cover the gap 6 between the adjacent moving path forming flat plates 1 (S3). .
[0039]
When the movement path is formed in this way, the air pallet 10 is inserted into the air pallet insertion port 9 of the movement pallet 2 and preparation for movement of the movement pallet 2 is made (S4).
[0040]
Then, the compressed air G is ejected from the diaphragm 11 of the air pallet 10 toward the floor surface, and buoyancy is efficiently given to the moving pallet 2 by the compressed air (S5). Due to this buoyancy, the static friction coefficient of the moving pallet 2 on which the cask 8 is placed is reduced to about 1/1000, and the moving pallet 2 is easily moved along the moving path by human power (S6). In this way, the moving pallet 2 is moved along the moving path. Even when the moving pallet 2 moves between the moving path forming flat plate 1 and the adjacent moving path forming flat plate 1, the gap 6 between the moving path forming flat plates 1 is an auxiliary for forming the moving path. Since it is covered by the flat plate 4, the compressed air G ejected from the diaphragm 11 of the air pallet 10 does not leak from the gap 6 and the buoyancy is not impaired.
[0041]
And when the movement path from a movement origin to a movement destination can be formed at once using the movement path formation flat plate 1 and the movement path formation auxiliary flat plate 4 prepared in advance (S7: Yes), it is for movement. While the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 through which the pallet 2 has passed are sequentially removed (S8), the moving pallet 2 is moved to the moving destination along the moving path (S10).
[0042]
On the other hand, the movement distance of the movement pallet 2 is long, and even if all the movement path forming flat plates 1 and the movement path forming auxiliary flat plates 4 provided in advance are used, the movement path from the movement source to the movement destination can be formed at a time. If it is not possible (S7: No), the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 through which the moving pallet 2 has passed are sequentially removed, and further removed the moving path forming flat plate 1 and the moving path. The forming auxiliary flat plate 4 is transported to the distal end side of the moving path and is sequentially laid on the distal end portion of the moving path (S9). Thereby, the moving path is extended to the moving destination, and the moving pallet 2 is moved to the moving destination (S10).
[0043]
As described above, in the cask moving apparatus to which the cask moving method according to Study Example 1 is applied, a moving path is formed by laying a plurality of moving path forming plates 1 in a row by the above-described action. The cask 8 can be moved along the moving path using the buoyancy provided from the air pallet 10 while being fixed to the moving pallet 2 in a vertically placed state. Therefore, even on uneven terrain, the cask 8 can be moved without being changed to the horizontal position in the middle and without giving a significant acceleration.
[0044]
Further, each moving path forming flat plate 1 laid on the laying surface 3 has its four corners height adjusted by a height adjusting tool 5 using a jack or the like so that the upper surface of the moving path forming flat plate 1 becomes horizontal. In addition, it is possible to adjust so that no step is generated between adjacent movement path forming flat plates 1. Further, the movement path forming auxiliary flat plate 4 can be installed so as to cover the gap 6 between the adjacent movement path forming flat plates 1. Thus, even when the moving pallet 2 moves between the moving path forming flat plate 1 and the adjacent moving path forming flat plate 1, the compressed air G ejected from the diaphragm 11 of the air pallet 10 is Leakage from the gap 6 does not occur and buoyancy is not impaired. Therefore, buoyancy can be efficiently applied to the movement pallet 2 from the movement source to the movement destination, and the movement efficiency can be increased.
[0045]
Further, since the moving pallet 2 can be attached and detached with the air pallet 10, the number of the air pallets 10 is not necessarily the same as the number of the moving pallets 2, and is provided with the number of the moving pallets 2 that move simultaneously. Therefore, the number of air pallets 10 can be rationalized.
[0046]
Furthermore, the moving path forming flat plate 1 and the moving path forming auxiliary flat plate 4 through which the moving pallet 2 has passed are sequentially removed, transported to the leading end side of the moving path, and sequentially laid at the leading end of the moving path. Thus, since the moving path can be extended to the destination, the cask 8 can be moved regardless of the distance of the destination.
[0047]
It will be described with reference to FIG. 9 an embodiment of implementation of (implementation form) present invention from FIG.
[0048]
FIG. 7 is a configuration diagram illustrating an example of the overall configuration of a cask moving apparatus to which the cask moving method according to the embodiment is applied. Here, portions described in the examination example 1 are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.
[0049]
In other words, the cask moving device to which the cask moving method according to the embodiment is applied has the moving pallet 2 as shown in the plan view shown in FIG. 7A and the elevation view shown in FIG. Are provided with jacks 17 for lifting the moving pallet 2 at at least four corners of the moving pallet 2.
[0050]
Next, the operation of the cask moving apparatus to which the cask moving method according to the embodiment configured as described above is applied will be described with reference to the operation explanatory diagram of FIG. 8 and the flowchart of FIG.
[0051]
First, the moving path forming flat plate 1 is laid on the laying surface 3 in the moving direction indicated by the arrow in the figure (S11).
[0052]
Next, as shown in FIG. 8A, the moving pallet 2 is placed on the moving path forming flat plate 3 (S12). Then, for example, a gas such as compressed air is supplied to the air pallet 10 and the gas is ejected from the air pallet 10 toward the surface on the moving path forming flat plate 1, thereby giving buoyancy to the moving pallet 2. (S13).
[0053]
Using this buoyancy, as shown in FIG. 8B, the moving pallet 2 is moved to the end side along the direction indicated by the arrow in the figure along the moving path forming flat plate 1 by human power. (S14).
[0054]
When the moving pallet 2 moves to the end side of the moving path forming flat plate 1, as shown in FIG. 8C, the moving pallet 2 is lifted by the jack 17 , and the load of the moving pallet 2 is increased. Is not applied to the moving path forming flat plate 1 (S15).
[0055]
In this state, as shown in FIG. 8D, the moving path forming flat plate 1 is moved and laid in the moving direction indicated by the arrow in the figure (S16). Thereafter, the jack 17 is lowered to place the moving cask 2 on the moving path forming flat plate 1, and the state shown in FIG. 8A, that is, returns to step S12.
[0056]
Thereafter, the operations from Step S12 to Step S16 are repeated until the cask 8 is moved to the moving place (S17: No).
[0057]
As described above, in the cask moving device to which the cask moving method according to the present embodiment is applied, the jack 17 is lowered and the load of the moving pallet 2 is placed on the moving path forming flat plate 1, and the air pallet 10 is used. The moving pallet 2 is moved along the moving path forming flat plate 1 and stopped when the moving pallet 2 moves to the end side. After the jack 17 is lifted, the moving path forming flat plate 1 is moved in the moving direction. Then, the cask 8 can be moved to a predetermined moving location by repeating a series of operations thereafter, that is, a so-called scale insect operation.
[0058]
Since such a moving method can move the moving path forming flat plate 1 along the laying direction, it does not require a special space for moving the moving path forming flat plate 1, so that it is a narrow place. It is possible to apply even if it moves along.
[0059]
Further, since the moving path forming flat plate 1 to be used is one, the moving pallet 2 does not need to exceed the end of the moving path forming flat plate 1. Therefore, it is not necessary to adjust the height between adjacent movement path forming flat plates 1, which is necessary for the moving path forming flat plate 1 in the examination example 1 . That is, the height adjuster 5 need only be adjusted so that the moving road surface is horizontal. Since the movement pallet 2 does not need to exceed the end of the movement path forming flat plate 1, the movement path forming auxiliary flat plate 4 is also unnecessary. Furthermore, even if there is one moving path forming flat plate 1, the cask 8 can be moved, so that a significant cost reduction can be achieved.
[0060]
As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this structure. Within the scope of the invented technical idea of the scope of claims, a person skilled in the art can conceive of various changes and modifications, and the technical scope of the present invention also relates to these changes and modifications. It is understood that it belongs to.
[0061]
【The invention's effect】
As described above, according to the present invention, even when uneven terrain exists in the middle of the movement path of the cask in which the nuclear fuel assemblies are stored , the cask is not changed to the horizontal position in the middle. The cask can be moved in a standing state and without giving significant acceleration.
[0062]
As described above, the cask moving device and the moving method in which the nuclear fuel assemblies capable of increasing the moving efficiency can be realized.
[Brief description of the drawings]
Engaging Ri present inventor has fixed in a state vertically the block diagram Figure 2 cask showing an example of an overall configuration of a cask mobile device using the method of moving cask Study Example 1 discussed in the present invention; FIG Fig. 3 is a perspective view showing a configuration example of a moving path forming flat plate. Fig. 4 is a conceptual diagram showing a state of the moving pallet receiving buoyancy. conceptual view illustrating a case for covering the gap between the road forming flat plates by iron plate 6 an embodiment of the operation flow chart 7 present invention shown in cask mobile device using the method of moving the Study example 1 cask operation explanatory diagram of a cask mobile device using the moving method of the cask according to the block diagram Figure 8 an embodiment of implementation of an example of the overall configuration of a cask mobile device using the moving method of the cask according to FIG. 9 key according to an embodiment of implementation FIG. 10 is a perspective view showing the entire configuration of the cask. FIG. 11 is a perspective view showing the entire configuration of the cask. The cask is vertically suspended by an overhead crane and moved to a predetermined storage location in the building. Schematic diagram showing the state
DESCRIPTION OF SYMBOLS 1 ... Moving path formation flat plate 2 ... Moving pallet 3 ... Laying surface 4 ... Moving path forming auxiliary flat plate 5 ... Height adjusting tool 6 ... Crevice 8 ... Cask 9 ... Air pallet insertion port 10 ... Air pallet 11 ... Diaphragm 12 ... Iron plate 13 ... Upper lid 14 ... Nuclear fuel assembly 15 ... Overhead crane 16 ... Special trailer 17 ... Jack

Claims (1)

Nuclear fuel assemblies are fixed on cradle and the error Aparetto is a moving method of the cask to move housed the cask,
A first step of laying a moving path forming flat plate that forms a moving path for moving an air pallet to which the cask is fixed, on an irregular ground in a moving direction;
After placing the gantry on the laid moving path forming flat plate, gas is supplied to the air pallet, and buoyancy is exerted on the gantry by the gas ejected from the air pallet toward the road surface of the moving path. And, by this buoyancy, the second step of moving the gantry along the moving path forming flat plate to the flat plate end side;
A third step in which, when the pedestal has moved to the flat plate end side, the pedestal is lifted so that the load is not applied to the moving path forming flat plate;
A fourth step of moving the moving path forming flat plate in the moving direction and laying on the irregular ground;
After placing the gantry on the laid moving path forming flat plate, gas is supplied to the air pallet, and buoyancy is exerted on the gantry by the gas ejected from the air pallet toward the road surface of the moving path. And the fifth step of moving the gantry along the moving path forming flat plate to the flat plate end side by this buoyancy,
A method for moving a cask containing a nuclear fuel assembly, wherein the frame is moved along the moving path by repeating the third and fourth steps after the fifth step. .

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