JP2019105351A - Shock absorption component, and cask - Google Patents

Abstract

To provide a shock absorption component capable of preventing a hollow cylindrical body from falling or breaking by improving the strength to the oblique direction load, and a cask.SOLUTION: A circumferential direction shock absorption component 40B comprises: a hollow cylindrical body 41 having a cylindrical shape extending along tube axial O2 direction; and an outer peripheral cylindrical component 42 disposed on the radially outside of the hollow cylindrical body 41 and having a cylindrical shape extending along tube axial O2 direction. The outer peripheral cylindrical component 42 includes a plurality of tubular bodies 43 in the tube axial O2 direction, the tubular body having a pipe shape extending along the tube axial O2 direction. In at least a pair of tubular bodies 43 adjacent to each other in the tube axial O2 direction, at least a part in the direction of the tube axis O2 of one tubular body 43 of the pair of tubular bodies 43 is fitted along an inner circumferential surface 43g of the other tubular body 43.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shock absorbing member and a cask.

  Casks are used to transport and store spent nuclear fuel containing radioactive material. The cask comprises a transport container for containing spent fuel therein, and a buffer mounted on the transport container.

For example, Patent Document 1 discloses a configuration including a plurality of hollow cylindrical bodies formed of sheets made of fiber reinforced plastic (FRP) as a buffer mounted on a transport container. In this configuration, the plurality of hollow cylindrical bodies are radially disposed outward in the radial direction of the transport container. Each hollow cylindrical body is provided such that an axial end surface faces the circumferential surface of the substantially cylindrical transport container.
In such a configuration, an impact acts on the buffer body when the transport container falls or falls, and when a load acts in the axial direction of the hollow cylindrical body, peeling fracture occurs in the axial direction in the hollow cylindrical body. Reduce the impact on the shipping container.

Unexamined-Japanese-Patent No. 2017-114564

  By the way, the hollow cylindrical body provided in the buffer has sufficient strength against the load in the axial direction. However, since the strength for the load in the direction intersecting the axial direction is smaller than the strength for the load in the axial direction, when a load in the oblique direction intersecting the axis of the hollow cylindrical body acts on the hollow cylindrical body. In some cases, the hollow cylindrical body provided in the buffer may fall or break depending on the direction and magnitude of the load.

  An object of the present invention is to provide a shock absorbing member and a cask capable of enhancing the strength against a load in an oblique direction and suppressing the falling and breaking of the hollow cylindrical body.

  The shock absorbing member of the first aspect is a main absorbing member having a cylindrical shape extending along the axial direction, and an outer peripheral cylinder having a cylindrical shape extending radially along the radial direction of the main absorbing member. A plurality of tubular members having a tubular shape having a tubular shape extending along the axial direction, and at least a pair of the tubular bodies adjacent to each other in the axial direction At least a portion of the axial direction of the tubular body of one of the pair of tubular bodies is fitted along the inner circumferential surface of the other tubular body.

  The impact absorbing member of this aspect is provided with an outer peripheral cylindrical member on the radial outside of the main absorbing member. When the load in the axial direction acts on the impact absorbing member, the load is mainly carried by the main absorbing member, and the peeling of the main absorbing member occurs in the axial direction according to the load in the axial direction, thereby absorbing the impact. . In the outer peripheral tubular member, when an excessive load acts in the axial direction, one tubular body gets into the inside of the other tubular body, and the outer peripheral tubular member contracts in the axial direction. On the other hand, when a load in a direction intersecting the axial direction of the impact absorbing member acts, an outer peripheral tubular member is provided radially outward of the main absorbing member, whereby the load can be reduced by the main absorbing member and the outer peripheral tubular member. It can bear the burden. Thereby, the load which bears by the main absorption member decreases, and it can control that the main absorption member which has cylinder shape falls or breaks.

  Further, in the impact absorbing member of the second aspect, at least a pair of the tubular bodies adjacent to each other in the axial direction have one or more of the tubular bodies being the other when a predetermined load in the axial direction or more is applied. The shock absorbing member according to the first aspect of the present invention is pushed into the inside of the tubular body.

  In the shock absorbing member of the third aspect, the outer peripheral surface of one of the tubular bodies and the inner peripheral surface of the other of the tubular bodies are in sliding contact over the entire circumference around the axial direction. The shock absorbing member according to the aspect of

  In the shock absorbing member of the fourth aspect, the main absorbing member is made of a fiber reinforced resin material, and the tubular body is made of one of a fiber reinforcing material, a metal material, and a resin material. It is an impact-absorbing member of any aspect.

  Further, in the shock absorbing member of the fifth aspect, the pair of tubular bodies adjacent to each other in the axial direction is the shock absorbing member of any one of the first to fourth aspects having different outer diameter dimensions.

  Further, in the impact absorbing member of the sixth aspect, the plurality of tubular bodies arranged in the axial direction have their outer diameter dimensions reduced sequentially from the first side in the axial direction toward the second side in the axial direction or It is an impact-absorbing member of the 5th aspect expanded.

  The impact absorbing member of the seventh aspect is the impact absorbing member of the sixth aspect, wherein the outer peripheral cylindrical member is disposed with the end on the side of the smaller outer diameter toward the impact absorbing object side. is there.

  Further, in the shock absorbing member of the eighth aspect, the main absorbing member is any one of the shocks according to any one of the first to seventh aspects, which is fitted inside the tubular body having the narrowest inner diameter in the outer peripheral cylindrical member. It is an absorption member.

  The shock absorbing member according to the ninth aspect is the shock absorbing member according to any one of the first to eighth aspects, wherein a reinforcing member for enhancing the strength of the main absorbing member is provided inside the main absorbing member. is there.

  The cask according to the tenth aspect has a cylindrical shape extending along the central axis, and a casing having at least a transport container for containing a radioactive substance therein, and an outer peripheral case portion provided radially outward of the transport container. And a shock absorbing member according to any one of the first to ninth aspects, wherein a plurality of shock absorbing members are provided between the outer peripheral case portion and the outer peripheral surface of the transport container.

  According to one aspect of the present invention, an impact absorbing member and a cask are provided that can increase strength against a load in an oblique direction and can prevent the hollow cylindrical body from falling or breaking.

It is a side view of the cask which concerns on 1st embodiment. It is the figure which looked at the impact-absorbing member which concerns on 1st embodiment from the central axis direction. It is a sectional view of an impact absorption member concerning a first embodiment. It is a sectional view showing the state where the shock absorption member concerning a first embodiment was crushed in the direction of a pipe axis. It is sectional drawing which shows the state which the load of the diagonal direction acted on the impact-absorbing member which concerns on 1st embodiment. It is a perspective view which shows the structure of the impact-absorbing member which concerns on 2nd embodiment. It is sectional drawing which shows the structure of the impact-absorbing member which concerns on 3rd embodiment.

  Hereinafter, various embodiments according to the present invention will be described using the drawings.

First Embodiment
Hereinafter, a cask provided with an impact absorbing member according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the cask 100 is constituted by a transport container (shock absorbing object) 10 and a pair of buffer bodies 20.

  The transport container 10 has a container body 10a having a cylindrical shape. The container body 10a has a cylindrical shape extending along the central axis O1, and both ends in the direction of the central axis O1 are closed. One end of the container body 10a in the direction of the central axis O1 can be opened and closed. The spent nuclear fuel 11 containing radioactive material is accommodated in the container body 10a. The spent nuclear fuel 11 is accommodated by opening one end of the container body 10a, and at the time of transportation, the one end is closed. Thus, the inside of the container body 10a is sealed at the time of transportation.

The shock absorber 20 comprises a casing 30 and shock absorbing means 40.
The casing 30 is a member having a disk shape centered on the central axis O1, and the inside is hollow. A pair of casings 30 is provided at both ends of the central axis O1 of the transport container 10. Each casing 30 has an end plate portion 30a having a disc shape orthogonal to the central axis O1, and a cylindrical portion having a cylindrical shape extending from the outer peripheral portion of the end plate portion 30a toward the transport container 10 along the central axis O1 direction. And 30b integrally. On the surface of the casing 30 facing the transport container 10, a recess 31 into which the end of the transport container 10 is fitted is formed inside the cylindrical portion 30b. By fitting the end of the transport container 10 into the recess 31 of the casing 30, both ends of the transport container 10 are protected against the load from the central axis O1 direction and the radial direction of the central axis O1.

  An annular space 32 and a disc-like space 33 are formed inside the casing 30. The annular space 32 is a portion having an annular shape continuously in the circumferential direction around the central axis O1 outside the range in which the recess 31 is formed in the direction of the central axis O1. The disk-like space 33 is located outward of the recess 31 in the direction of the central axis O1 (opposite to the transport container 10 side). The disk-like space 33 is formed in a region having a disk shape having a constant length in the direction of the central axis O1.

The impact absorbing means 40 includes an axial impact absorbing member 40A and a circumferential impact absorbing member (impact absorbing member) 40B.
The axial impact absorbing member 40 </ b> A is filled in the disc-like space 33 in the casing 30. An arbitrary configuration can be adopted as the axial impact absorbing member 40A. The axial impact absorbing member 40A abuts the end of the transport container 10 fitted in the recess 31 from the outside in the direction of the central axis O1. When an impact in the direction of the central axis O1 is input to the transport container 10, the axial impact absorbing member 40A absorbs the impact.

Hereinafter, the circumferential direction impact absorbing member 40B will be described with reference to FIGS.
As shown in FIG. 2, the circumferential impact absorbing member 40 </ b> B is accommodated in an annular space 32 in the casing 30. That is, the circumferential impact absorbing member 40B is disposed radially outside the transport container 10 fitted in the recess 31. A plurality of circumferential impact absorbing members 40 </ b> B are radially disposed at intervals in the circumferential direction.

  As shown in FIG. 3, each circumferential impact absorbing member 40 </ b> B includes a hollow cylindrical body (main absorbing member) 41 and an outer peripheral cylindrical member 42. The hollow cylindrical body 41 is a hollow tubular member that extends with a constant diameter along the direction of the tube axis O2 and has a hollow portion 41 h. In the present embodiment, the hollow cylindrical body 41 has a circular shape in a cross section perpendicular to the direction of the tube axis O2. The hollow cylindrical body 41 is formed of CFRP and GFRP sheets in which continuous carbon fibers and glass fibers are impregnated with a plastic resin.

The outer circumferential tubular member 42 is disposed radially outside the hollow tubular body 41. The outer circumferential tubular member 42 has a tubular shape extending along the direction of the tube axis O2. The outer circumferential tubular member 42 includes a plurality of tubular tubes 43 extending in the direction of the tube axis O2 in the direction of the tube axis O2. In the present embodiment, the outer circumferential tubular member 42 includes a total of six tubular bodies 43.
Each tubular body 43 is made of one of a fiber reinforced material such as CFRP and GFRP, a metal material, and a resin material.

The plurality of tubular bodies 43 aligned in the direction of the tube axis O2 have an outer diameter from the end 42a on the first side in the direction of the tube axis 02 to the end 42b on the second side in the direction of the tube axis O2. The dimensions are shrinking sequentially. Thus, the pair of tubular bodies 43 adjacent to each other in the direction of the tube axis O2 have different outer diameter dimensions. In the pair of tubular bodies 43 adjacent to each other in the direction of the tube axis O2, at least a portion in the direction of the tube axis O2 of one tubular body 43 of the pair of tubular bodies 43 is on the inner circumferential surface 43g of the other tubular body 43 It is fitted along.
The hollow cylindrical body 41 has the end 41a on the end 42b side of the outer peripheral cylindrical member 42 fitted inside the tubular body 43A having the narrowest inner diameter in the outer peripheral cylindrical member 42.

  The outer peripheral surface 43f of one tubular body 43 and the inner peripheral surface 43g of the other tubular body 43 are in sliding contact over the entire circumference around the direction of the pipe axis O2. Thus, the friction force generated between the outer peripheral surface 43 f of one tubular body 43 and the inner peripheral surface 43 g of the other tubular body 43 causes the one tubular body 43 to move relative to the other tubular body 43 in the direction of the tube axis O2. In the protruding state, the positional relationship between each other is maintained. At least one pair of tubular bodies 43 adjacent to each other in the direction of the tubular axis O2 is pushed into the inside of the other tubular body 43 when a load in the direction of the prescribed tubular axis O2 acts. Thereby, the circumferential direction impact-absorbing member 40B is reduced in length in the direction of the tube axis O2 when a load in the direction of the tube axis O2 more than a predetermined value acts.

  In the present embodiment, the outer peripheral cylindrical member 42 has the end 42b on the side with the smaller outer diameter dimension directed toward the transport container 10 that is the shock absorbing object, and the end 42a on the side with the larger outer diameter is It arrange | positions toward the 30 cylindrical part 30b side.

When the load P in the direction of the tube axis O2 acts on the circumferential impact absorbing member 40B, mainly due to the peeling failure of the hollow cylindrical body 41 in the axial direction, the impact due to the load P in the direction of the tube axis O2 is absorbed . When a large load P that causes the hollow cylindrical body 41 to collapse in the direction of the tube axis O2 acts, as shown in FIG. 4, the outer peripheral cylindrical members 42 are one tubular body 43 adjacent to each other in the direction of the tube axis O2. Is pushed into the inside of the other tubular body 43, the overall length thereof is reduced.
Thus, the outer peripheral tubular member 42 has low strength and low rigidity in the direction of the pipe axis O2.

  Further, as shown in FIG. 5, the circumferential impact absorbing member 40B is provided with an outer peripheral cylindrical member 42 at the radial outer side of the hollow cylindrical body 41, and has a so-called double internal / external double structure. When the load P in the direction intersecting with the direction of the tube axis O2 acts, the load P is shared and carried by the hollow cylindrical body 41 and the circumferential impact absorbing member 40B. Thereby, in the hollow cylindrical body 41, the load of the load P in the direction intersecting with the direction of the tube axis O2 is reduced.

Next, the operation and effects of the circumferential impact absorbing member 40B and the cask 100 having the above-described configuration will be described.
In the present embodiment, the circumferential impact absorbing member 40B includes the hollow cylindrical body 41 and the outer peripheral cylindrical member 42. Further, the outer peripheral tubular member 42 includes a plurality of tubular bodies 43 in the direction of the tube axis O2. Furthermore, at least a part of the tubular body 43 in the direction of the tube axis O2 of the tubular bodies 43 adjacent to each other in the direction of the tube axis O2 is fitted along the inner circumferential surface 43g of the other tubular body 43.
In the circumferential impact absorbing member 40B of the present embodiment, the outer cylindrical member 42 is provided on the radially outer side of the hollow cylindrical body 41 so that the load in the direction intersecting the direction of the pipe axis O2 can be reduced. And the outer cylindrical member 42. This reduces the load on the hollow cylindrical body 41 having a cylindrical shape. Therefore, there is provided the circumferential impact absorbing member 40B and the cask 100 capable of enhancing the strength against the load in the oblique direction intersecting the tube axis O2 direction and suppressing the hollow cylindrical body 41 from falling or breaking.

  In addition, in the circumferential impact absorbing member 40B, the tubular bodies 43 adjacent to each other in the direction of the tube axis O 2 have one tubular body 43 acting as the other tubular body when a load in the direction of the predetermined tube axis O 2 acts. It is pushed inside of 43. According to such a configuration, the outer peripheral tubular member 42 formed of the plurality of tubular bodies 43 maintains the length in the direction of the tube axis O2 unless a predetermined excess load or more acts on the hollow tubular body 41 can bear a part of the load in the direction of the pipe axis O2. When an excessive load more than a predetermined amount acts in the direction of the tube axis O2, one tubular body 43 enters the inside of the other tubular body 43, and the outer circumferential tubular member 42 contracts in the direction of the tube axis O2.

Further, the outer peripheral surface 43f of one tubular body 43 and the inner peripheral surface 43g of the other tubular body 43 are in sliding contact over the entire circumference around the direction of the pipe axis O2.
According to such a configuration, the outer circumferential cylindrical member 42 formed of the plurality of tubular bodies 43 is made by the frictional force generated between the outer circumferential surface 43 f of the one tubular body 43 and the inner circumferential surface 43 g of the other tubular body 43. The length in the direction of the tube axis O2 can be maintained, and part of the load in the direction of the tube axis O2 to be borne by the hollow cylindrical body 41 can be borne. By adjusting the frictional force generated between the outer peripheral surface 43f of one tubular body 43 and the inner peripheral surface 43g of the other tubular body 43, the size of the load in the direction of the tube axis O2 that can be borne by the outer peripheral tubular member 42 Can be adjusted.

  The hollow cylindrical body 41 is made of a fiber reinforced resin material, and the outer peripheral cylindrical member 42 is made of one of a fiber reinforced material, a metal material and a resin material. Thereby, in each of the hollow cylindrical body 41 and the outer peripheral cylindrical member 42, by adjusting the fiber direction and thickness appropriately, the strength against the load in the direction crossing the tube axis O2 direction and the tube axis O2 direction is adjusted. Can.

  Further, in the circumferential impact absorbing member 40B, the pair of tubular bodies 43 adjacent to each other in the direction of the tube axis O2 have different outer diameter dimensions. Thereby, when an excessive force acts in the direction of the tube axis O2, one tubular body 43 enters the inside of the other tubular body 43 in the tubular bodies 43 adjacent to each other in the direction of the tube axis O2, and the outer peripheral tubular The member 42 contracts in the direction of the tube axis O2.

  Moreover, the outer diameter size of the plurality of tubular bodies 43 aligned in the direction of the tube axis O2 sequentially decreases from the first side in the direction of the tube axis 02 toward the second side in the direction of the tube axis O2. Thereby, all the other tubular bodies 43 enter inside the tubular body 43 on the first end 42 a side. As a result, the outer circumferential tubular member 42 can be maximally contracted in the direction of the tube axis O2.

  In addition, the outer peripheral tubular member 42 is disposed with the end 42 b on the side with the smaller outer diameter dimension directed toward the transport container 10 that is the shock absorbing object. According to such a configuration, the outer peripheral cylindrical member 42 has an outer diameter larger at the end 42 a opposite to the shock absorbing object. When a load in the direction intersecting the direction of the tube axis O2 from the circumferential impact absorbing member 40B acts on the end 42b on the side where the outer diameter dimension of the outer peripheral tubular member 42 is smaller, the end 42a on the opposite side is A moment by load acts. The end portion 42a on the side on which the moment acts has a large outer diameter size of the outer peripheral cylindrical member 42, and therefore can exhibit sufficient strength against the moment.

  The hollow cylindrical body 41 is fitted to the inside of the tubular body 43A having the narrowest inner diameter in the outer peripheral cylindrical member 42. According to such a configuration, the hollow cylindrical body 41 and the outer peripheral cylindrical member 42 can be integrated.

In the above embodiment, the outer cylindrical member 42 is disposed so that the end 42b having the smaller outer diameter is directed to the side of the transport container 10, which is a shock absorbing object, but the present invention is not limited thereto. That is, the outer peripheral cylindrical member 42 may be disposed so that the end 42 a having the larger outer diameter dimension is directed to the side of the transport container 10 which is the shock absorbing object.
Moreover, in the said embodiment, although the casing 30 is a member which has disk shape, as a modification, the casing 30 may be polygonal-disk shape. In this case, the disc-like space 33 is a polygonal disc-like space.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.
In the impact absorbing member of the second embodiment, the reinforcing member 45 is provided inside the hollow cylindrical body 41 in preparation for the impact absorbing member of the first embodiment.
As shown in FIG. 6, the circumferential direction impact absorbing member (impact absorbing member) 40C provided in the cask 100 of the present embodiment includes the hollow cylindrical body 41, the outer peripheral cylindrical member 42, and the reinforcing member 45. Prepare.
The reinforcing member 45 extends in the direction of the pipe axis O2, and is provided inside the hollow cylindrical body 41 having a cylindrical shape. The reinforcing member 45 enhances the strength of the hollow cylindrical body 41 in the direction of the pipe axis O2. In the present embodiment, the reinforcing member 45 has a cross-sectional shape orthogonal to the direction of the tube axis O2 as a cross shape.

  The circumferential impact absorbing member 40C and the cask 100 of the second embodiment include the outer circumferential cylindrical member 42 on the radially outer side of the hollow cylindrical body 41 as in the first embodiment. The circumferential impact absorbing member 40C and the cask 100 of the second embodiment further include a reinforcing member 45 on the radially inner side. The circumferential impact absorbing member 40C receives the load by the hollow cylindrical body 41, the outer cylindrical member 42, and the reinforcing member 45 when a load in a direction intersecting the tube axis O2 acts. be able to. Therefore, the circumferential direction shock absorbing member 40C and the cask 100 are provided which can enhance the strength against the load in the oblique direction intersecting the direction of the tube axis O2 and suppress the hollow cylindrical body 41 from falling or breaking.

Third Embodiment
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.
The circumferential direction impact absorbing member (impact absorbing member) 40D of the third embodiment is provided by being stacked in multiple stages in the direction of the tube axis O2.

  As shown in FIG. 7, between the outer peripheral surface of the transport container 10 and the cylindrical portion 30b of the casing 30, one or more, for example, two wall portions 60A and 60B are provided at intervals in the radial direction. ing. The wall portions 60A and 60B are continuously formed in the circumferential direction around the central axis O1.

The circumferential impact absorbing member 40D can have the same configuration as that of the circumferential impact absorbing member 40B shown in the first embodiment or the circumferential impact absorbing member 40C shown in the second embodiment.
The circumferential impact absorbing member 40D is provided between the outer peripheral surface of the transport container 10 and the cylindrical portion 30b of the casing 30 so as to be stacked in a plurality of stages, for example, three stages in the direction of the pipe axis O2. Specifically, the circumferential impact absorbing member 40D is provided between the outer peripheral surface of the transport container 10 and the wall 60A, between the wall 60A and the wall 60B, and the wall 60B and the cylindrical portion 30b of the casing 30. Are provided respectively.

In the circumferential impact absorbing member 40D and the cask 100 of the third embodiment, the length of the circumferential impact absorbing member 40D in the direction of the tube axis O2 can be reduced, and the direction of the tube axis O2 of the hollow cylindrical body 41 can be reduced. Can reduce buckling in
Further, as in the first embodiment, by providing the outer circumferential cylindrical member 42, it is possible to suppress that the hollow cylindrical body 41 having a cylindrical shape falls or breaks. Therefore, the circumferential direction shock absorbing member 40D and the cask 100 are provided which can increase the strength against the load in the oblique direction intersecting the direction of the tube axis O2 and suppress the hollow cylindrical body 41 from falling or breaking.

  While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

10 Transport container (shock absorbing object)
DESCRIPTION OF SYMBOLS 10a Container main body 11 Nuclear fuel 20 Buffering body 30 Casing 30a End plate part 30b Tubular part (outer peripheral case part)
31 Recess 32 Annular space 33 Disc-like space 40 Impact absorbing means 40A Axial impact absorbing member 40B Circumferential impact absorbing member (impact absorbing member)
40C circumferential shock absorber (shock absorber)
40D circumferential shock absorber (shock absorber)
41 Hollow cylindrical body (main absorption member)
41a end 41h hollow portion 42 outer peripheral cylindrical member 42a end 42b end 43 tubular body 43A tubular body 43f outer peripheral surface 43g inner peripheral surface 45 reinforcing member 60A wall portion 60B wall portion 100 cask O1 central axis O2 tube axis

Claims (10)

A main absorbent member having a cylindrical shape extending along an axial direction;
An outer peripheral cylindrical member disposed outside the main absorbent member in the radial direction and having a cylindrical shape extending along the axial direction;
The outer circumferential tubular member includes a plurality of tubular bodies having a tubular shape extending along the axial direction, in the axial direction;
In the at least one pair of the tubular bodies axially adjacent to each other, the outer circumferential surface of at least a part of the axial body of one of the tubular bodies of the pair of tubular bodies is the inner circumferential surface of the other tubular body Shock-absorbing member fitted along. The at least one pair of the tubular bodies axially adjacent to each other is pushed into the inside of the other tubular body in the case where a predetermined load or more in the axial direction acts on the tubular bodies. The shock absorbing member as described in. The shock absorbing member according to claim 1 or 2, wherein the outer peripheral surface of one of the tubular bodies and the inner peripheral surface of the other tubular body are in sliding contact over the entire circumference around the axial direction. The main absorbent member is made of a fiber reinforced resin material,
The shock absorbing member according to any one of claims 1 to 3, wherein the tubular body is made of one of a fiber reinforcing material, a metal material, and a resin material. The impact-absorbing member according to any one of claims 1 to 4, wherein the pair of the tubular bodies adjacent to each other in the axial direction have different outer diameter dimensions. The shock absorbing member according to claim 5, wherein the plurality of tubular bodies arranged in the axial direction sequentially decrease or expand in an outer diameter dimension from a first side in the axial direction toward a second side in the axial direction. The shock absorbing member according to claim 6, wherein the outer peripheral cylindrical member is disposed with an end on the side of a smaller outer diameter dimension facing the shock absorbing object. The impact-absorbing member according to any one of claims 1 to 7, wherein the main absorbing member is fitted inside the tubular body having the narrowest inner diameter in the outer peripheral cylindrical member. The impact-absorbing member according to any one of claims 1 to 8, wherein a reinforcing member that enhances the strength of the main absorbing member is provided inside the main absorbing member. A transport container having a cylindrical shape extending along the central axis and containing radioactive material therein;
A casing having at least an outer peripheral case portion provided radially outward of the transport container;
The shock absorbing member according to any one of claims 1 to 9, wherein a plurality is provided between the outer peripheral case portion and the outer peripheral surface of the transport container.
Cask equipped with.

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