JP4297404B2 - Falling cask transport method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for transporting a fallen cask, for example, in which a substantially cylindrical cask containing a radioactive substance such as a nuclear fuel assembly falls and transports a cask that has been placed horizontally.
[0002]
[Prior art]
Spent fuel assemblies 21 generated in the nuclear power plant are stored in a predetermined number of bodies in a substantially cylindrical dedicated container called a cask 2 as shown in FIG. As described above, the cask 2 in which the fuel assemblies 21 are stored is stored in the cask storage building with the fuel assemblies 21 stored therein until the fuel assemblies 21 are subjected to reprocessing.
[0003]
As shown in FIG. 9, the cask 2 transported to the cask storage building by the dedicated trailer 25 is lifted one by one by the overhead crane 22 in the cask storage building and moved to a predetermined storage location 26 in the cask storage building. It was normal.
[0004]
However, in the case of a cask storage building using such an overhead crane 22, a floor height that only lifts the cask 2 is required, resulting in an increase in the size of the building. In addition, the cask 2 in which the fuel assembly 21 is housed is a heavy article having a weight exceeding 100 tons, and the load design of the overhead crane 22 becomes extremely strict. For this reason, the construction cost of the cask storage building becomes enormous.
[0005]
Therefore, recently, a cask storage building in which the cask 2 is moved using an air pallet instead of the overhead crane 22 has been studied. The cask storage building that moves the cask 2 along the floor of the building using such an air pallet can not only eliminate the overhead crane 22 itself, but also no longer needs to lift the cask 2. Since the floor height can also be reduced, the building can be reduced, and the construction cost can be reduced.
[0006]
[Problems to be solved by the invention]
However, such a cask storage building has the following problems.
[0007]
That is, in the cask storage building provided with the overhead crane 22, even if the cask 2 falls down and falls into a sideways state, the overhead crane 22 lifts the fallen cask 2 as it is.
[0008]
However, the overhead crane 22 is not provided in the cask storage building that moves the cask 2 along the floor of the building by the air pallet. Therefore, in such a cask storage building, when the cask 2 falls down, there is a problem that the fallen cask 2 cannot be moved to a predetermined location.
[0009]
The present invention has been made in view of such circumstances, and even when a cask falls in a cask storage building that does not include an overhead crane, the fallen cask can be transported to a predetermined location. It is an object of the present invention to provide a method for conveying a possible fallen cask.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following measures.
[0011]
That is, in the method for transporting the overturned cask according to the first aspect of the present invention, there is provided a substantially columnar cask having a trunnion having a bottom surface of the cask fixed to a flat base plate and projecting from the outer periphery of the trunk portion on the cask head side. In the case of falling down and being placed horizontally on the floor surface, first, the trunnion and the base plate are lifted to form a gap between the cask and the floor surface. Next, an air pallet is inserted into the gap between the cask head side and the cask bottom side. Then, compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask and using the buoyancy, the overturned cask is moved along the floor. Transport.
[0012]
In the method of transporting the overturned cask according to the second aspect of the present invention, the truss has four trunnions protruding at symmetrical positions on the outer periphery of the trunk on the cask head side, and each side of the flat plate-like base plate has four trunnions. The base plate is fixed to the bottom of the cask so that it is almost parallel to the projecting direction of the two trunnions at the opposing position and almost perpendicular to the projecting direction of the two trunnions at the other opposing positions. When the columnar cask falls down and is placed horizontally on the floor surface, first, of the four trunnions, two trunnions whose projecting directions are substantially parallel to the floor surface and facing each other, and Lift the base plate to form a gap between the cask and the floor. Next, an air pallet is inserted into the gap between the cask head side and the cask bottom side. Then, compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask and using the buoyancy, the overturned cask is moved along the floor. Transport.
[0013]
According to a third aspect of the present invention, there is provided a method of transporting the overturned cask comprising a pair of trunnions projecting at symmetrical positions on the outer periphery of the trunk portion on the cask head side, and two sides of the flat base plate projecting from the pair of trunnions. A substantially cylindrical cask with the base plate fixed to the bottom surface of the cask so that the other two sides of the base plate are substantially perpendicular to the projecting direction, almost parallel to the installation direction, and the projecting direction on the floor surface When the horizontal position is set substantially parallel to the pair, first, the pair of trunnions and the base plate are lifted to form a gap between the cask and the floor surface. Next, an air pallet is inserted into the gap between the cask head side and the cask bottom side. Then, compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask and using the buoyancy, the overturned cask is moved along the floor. Transport.
[0014]
According to a fourth aspect of the present invention, there is provided a method for transporting the overturned cask comprising a pair of trunnions projecting at symmetrical positions on the outer periphery of the body portion on the cask head side, and two sides of the flat base plate projecting from the pair of trunnions. A substantially cylindrical cask with the base plate fixed to the bottom surface of the cask so that the other two sides of the base plate are substantially perpendicular to the projecting direction, almost parallel to the installation direction, and the projecting direction on the floor surface When the machine is placed horizontally so that it is almost vertical, a jig for lifting the cask is attached to the cask head side, and the jig and base plate are lifted between the cask and the floor. Create a gap. Next, an air pallet is inserted into the gap between the cask head side and the cask bottom side. Then, compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask and using the buoyancy, the overturned cask is moved along the floor. Transport.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
In addition, the code | symbol in the figure used for description of each following embodiment attaches | subjects and shows the same code | symbol about the same part as FIGS. 8-9.
[0017]
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
[0018]
FIG. 1 is a conceptual diagram for explaining a method of conveying a fallen cask according to the first embodiment.
[0019]
FIG. 2 is a plan view of the cask viewed from above.
[0020]
FIG. 3 is a plan view of the cask bottom fixed to the base plate.
[0021]
4 is a cross-sectional view taken along line AA in FIG. 1 and a cross-sectional view taken along line BB.
[0022]
FIG. 5 is a cross-sectional cutaway view showing a configuration example of an air pallet.
[0023]
FIG. 6 is a flowchart showing a method for transporting the fallen cask according to the first embodiment.
[0024]
Fig.1 (a) has shown the case where the cask 2 fell and it was in a horizontal state. When the cask 2 is carried into the cask storage building, the cask bottom is fixed to the rectangular flat base plate 3 at the four fixing portions 5 (# 1 to # 4). In addition, the cask 2 includes four trunnions 4 projecting from symmetrical positions on the outer periphery of the trunk part on the cask head side and the bottom side, respectively.
[0025]
That is, as shown in FIG. 2, the cask 2 has four trunnions 4 (# 1 to # 4) protruding from the cask head side at 90 ° intervals with the center G of the cask cross section as the center. Similarly, four trunnions 4 (# 5 to # 8) provided at the same position are also provided on the bottom side of the cask.
[0026]
As described above, since the rectangular flat plate base plate 3 is fixed to the bottom surface of the cask, when such a cask 2 falls down, as shown in FIG. Touches the floor 8. The base plate 3 is provided with four protruding portions 6 (# 1 to # 4) so as to be positioned in the extending direction of the respective fixing portions 5 (# 1 to # 4). The protrusion 6 (# 4) is sufficiently small with respect to the base plate 3, and here, in order to show that one side of the base plate 3 is installed on the floor surface 8 when the cask 2 falls, the protrusion 6 ( # 4) is not described.
[0027]
Further, on this base plate 3, each fixing portion 5 (# 1 to # 4) is arranged in the same direction as the projecting direction of each trunnion 4 (# 5 to # 8) from the cross-sectional center G of the cask 2. It protrudes toward you. Therefore, each protrusion 6 (# 1 to # 4) is in the same direction as each trunnion 4 (# 1 to # 4) and each trunnion 4 (# 5 to # 8) from the cross-sectional center G of the cask 2. It is arranged to be.
[0028]
Therefore, when such a cask 2 falls and falls into a sideways state (S1), as shown in FIGS. 1 (a) and 3, any two trunnions of trunnions 4 (# 1 to # 4) will be shown. 4 (for example, trunnion 4 (# 2) and trunnion 4 (# 4)) are substantially parallel to the floor surface 8, that is, substantially in the horizontal direction. Similarly, two corresponding trunnions 4 (for example, trunnion 4 (# 6) and trunnion 4 (# 8)) of the trunnions 4 (# 5 to # 8) are also directed substantially in the horizontal direction. Further, the corresponding two protrusions (for example, the protrusion 6 (# 2) and the protrusion 6 (# 4)) of the protrusions 6 (# 1 to # 4) are also directed substantially in the horizontal direction. become.
[0029]
In such a state, the trunnion receiving jig 10 is mounted on the two trunnions 4 on the cask head side facing substantially the horizontal direction. Similarly, the projection receiving jig 11 is mounted on the two projections 6 that are oriented substantially in the horizontal direction (S2). Furthermore, the jack 12 is set to each trunnion receiving jig 10 and each projection receiving jig 11 (S3). The trunnion receiving jig 10 and the protrusion receiving jig 11 enable the jack 12 to jack up the cask 2 efficiently.
[0030]
By raising the four jacks 12 thus mounted, the cask 2 is lifted as shown in FIG. 1B, and a gap 17 is formed between the cask 2 and the floor 8 (S4). . Then, using the gap 17, the cask receiver 14 is inserted into each of the cask head side and the cask bottom side (S5). The cask receiver 14 is configured such that an air pallet 15 can be attached to the lower part thereof. Thereafter, as shown in FIGS. 1C and 4, the jack 12 is released from the floor surface 8, and the cask 2 is placed on the cask receiver 14 (S6).
[0031]
Next, the air pallet 15 is attached to the lower part of the cask receiver 14, and the compressed air 20 is supplied to the air pallet 15 (S7). As shown in FIG. 5, the air pallet 15 includes two diaphragms 18 arranged side by side, and jets compressed air 20 supplied from a compressed air supply unit (not shown) through an air hose 19 from these diaphragms 18. . As a result, buoyancy is imparted to the cask receiver 14 and the coefficient of static friction of the cask receiver 14 on which the cask 2 is placed is reduced to approximately 1/1000, so that even if the cask 2 is placed, The cask receiver 14 can be moved to a predetermined location along the floor surface 8 by human power.
[0032]
Accordingly, the cask receiver 14 is moved along the floor surface 8 to a predetermined location by the operator pulling or by the dedicated moving vehicle 23 as shown in FIG. 1C (S8).
[0033]
As described above, in the method for transporting a fallen cask according to the present embodiment, even if the cask 2 falls over in a cask storage building that does not include an overhead crane, the trunnion 4 on the cask head side and the base The protruding portion 6 of the plate 3 can be jacked up, and the fallen cask 2 can be lifted while being placed sideways.
[0034]
Next, by inserting the cask receiver 14 into the gap 17 between the floor surface 8 and the cask 2, the cask 2 can be placed on the cask receiver 14. Further, the air pallet 15 is mounted on the cask receiver 14, and the cask receiver 14 is moved along the floor surface 8 to a predetermined position while the cask 2 is placed by the buoyancy applied from the air pallet 15. Can do.
[0035]
In the present embodiment, the example in which the two trunnions 4 on the cask head side and the two projections 6 of the base plate 3 are jacked up by the jacks 12 has been described, but the two projections of the base plate 3 are described. Instead of the portion 6, two trunnions 4 substantially parallel to the floor surface 8 on the cask bottom side may be jacked up by the jack 12.
[0036]
(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.
[0037]
In the first embodiment, the transport method in the case where the cask 2 having four trunnions 4 on the cask head side and the cask bottom side has fallen has been described, but the transport method of the overturned cask of the present invention is The present invention can be applied not only to such a cask 2 but also to a cask 2 having only two trunnions 4 on each of the cask head side and the cask bottom side as shown in FIG.
[0038]
For example, in the case of the cask 2 having only two trunnions 4 on the cask head side and the cask bottom side, depending on the manner of the fall, as shown in FIG. 7A, two trunnions 4 (# 1, In some cases, # 2) is directed in the vertical direction, that is, in the vertical direction with respect to the floor surface 8 and not in the horizontal direction with respect to the floor surface 8.
[0039]
In such a case, as shown in FIG. 7B, the fixing jig 24 is fixed to the outer surface of the trunk portion at the center height of the cask 2. By attaching the trunnion receiving jig 10 to the fixing jig 24, the cask head side can be jacked up by the jack 12.
[0040]
By doing as described above, the method of transporting the overturning cask according to the present embodiment can also exhibit the same operational effects as the first embodiment.
[0041]
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 technical idea described in the claims, those skilled in the art will be able to conceive of various changes and modifications. The technical scope of the present invention is also applicable to these changes and modifications. It is understood that it belongs to.
[0042]
【The invention's effect】
As described above, according to the present invention, even if the cask falls over in a cask storage building that does not have an overhead crane, the overturned cask can transport the fallen cask to a predetermined place. The conveyance method can be realized.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram for explaining a method of transporting a fallen cask according to a first embodiment. FIG. 2 is a plan view of the cask (when four trunnions are provided on the head side and the bottom side, respectively).
3 is a plan view of a cask bottom fixed to a base plate. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1 and a cross-sectional view taken along the line BB. FIG. 6 is a cross-sectional cutaway view showing an example. FIG. 6 is a flowchart showing a method for transporting a fallen cask according to the first embodiment. FIG. 7 is a plan view of the cask (when two trunnions are provided on the head side and the bottom side). )
FIG. 8 is a perspective view showing a configuration example of a general cask. FIG. 9 is a front sectional view showing a configuration example of a general cask storage building.
G ... Cask cross-sectional center 2 ... Cask 3 ... Base plate 4 ... Trunnion 5 ... Fixing part 6 ... Protrusion 8 ... Floor surface 10 ... Trunnion receiving jig 11 ... Protrusion receiving jig 12 ... Jack 14 ... Cask receiving 15 ... Air Pallet 17 ... Gap 18 ... Diaphragm 19 ... Air hose 20 ... Compressed air 21 ... Fuel assembly 22 ... Overhead crane 23 ... Moving vehicle 24 ... Fixing jig 25 ... Dedicated trailer 26 ... Storage place

Claims (4)

When a cask-shaped cask with a trunnion with the bottom of the cask fixed to a flat base plate and a trunnion projecting on the outer periphery of the trunk on the cask head side falls and is placed horizontally on the floor ,
Lifting the trunnion and the base plate to form a gap between the cask and the floor surface,
Insert an air pallet into the gap on the cask head side and the cask bottom side,
Compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor surface, thereby giving buoyancy to the overturned cask, and using the buoyancy, the overturned cask is transferred to the floor. A method for transporting a fallen cask characterized by transporting along a surface. Four trunnions projecting at symmetrical positions on the outer periphery of the trunk on the cask head side, and two trunnions projecting with each side of the flat base plate facing each other among the four trunnions A substantially cylindrical cask with the base plate fixed to the bottom surface of the cask so that it is almost parallel to the direction and perpendicular to the projecting direction of the two trunnions at the other opposing positions falls to the floor surface. When placed horizontally,
Among the four trunnions, two trunnions whose projecting directions are substantially parallel to the floor surface, and the base plate are lifted to form a gap between the cask and the floor surface. ,
Insert an air pallet into the gap on the cask head side and the cask bottom side,
Compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask, and using the buoyancy, the overturned cask is transferred to the floor. A method for transporting a fallen cask characterized by transporting along a surface. A pair of trunnions projecting at symmetrical positions on the outer periphery of the trunk on the cask head side are provided, and the two sides of the flat base plate are substantially parallel to the projecting direction of the pair of trunnions. So that the base plate is fixed to the bottom surface of the cask so that the two sides are substantially perpendicular to the projecting direction, and the projecting direction is substantially parallel to the floor surface. When it becomes a horizontal state,
Lifting the pair of trunnions and the base plate to form a gap between the cask and the floor surface,
Insert an air pallet into the gap on the cask head side and the cask bottom side,
Compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask, and using the buoyancy, the overturned cask is transferred to the floor. A method for transporting a fallen cask characterized by transporting along a surface. A pair of trunnions projecting at symmetrical positions on the outer periphery of the trunk on the cask head side are provided, and the two sides of the flat base plate are substantially parallel to the projecting direction of the pair of trunnions. So that the base plate is fixed to the bottom surface of the cask so that the two sides thereof are substantially perpendicular to the projecting direction, and the projecting direction is substantially perpendicular to the floor surface. When it becomes a horizontal state,
A jig for lifting the cask is attached to the cask head side, and a gap is formed between the cask and the floor by lifting the jig and the base plate.
Insert an air pallet into the gap on the cask head side and the cask bottom side,
Compressed gas is supplied to the air pallet, and the compressed gas is ejected from the air pallet toward the floor, thereby giving buoyancy to the overturned cask, and using the buoyancy, the overturned cask is transferred to the floor. A method for transporting a fallen cask characterized by transporting along a surface.

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