JP6129501B2 - Radioactive substance storage container gantry and radioactive substance storage container support structure - Google Patents

Description

  The present invention relates to a base for a radioactive substance storage container for storing and storing radioactive waste, and a support structure for the radioactive substance storage container.

  Radioactive waste generated in a nuclear power plant nuclear reactor or the like is stored in a radioactive material storage container, transported to a storage facility or a reprocessing facility, and stored or reprocessed. Such a radioactive substance storage container is composed of, for example, a cylindrical body having a bottom with an open top and a lid fixed to the upper part of the trunk, and is hung on the outer periphery of the trunk. Multiple trunnions as are fixed.

  Therefore, radioactive waste is stored in a radioactive substance storage container, transported to a storage facility or a reprocessing facility by a ship, a vehicle, or the like, and stored or reprocessed for a predetermined number of years in this facility. In this conveyance and handling, the radioactive substance storage container is suspended and transferred via a trunnion by a container transfer crane or the like.

  This radioactive substance storage container is installed in a vertically standing state on a gantry in a storage facility or a reprocessing facility, and a plurality (for example, four) provided in the lower part so as not to fall down due to an earthquake or the like The trunnion is sandwiched between upper and lower fixed plates. However, since the radioactive substance storage container is transported not only in a standing state but also in a sideways state, two trunnions are required on the upper and lower sides of the trunk part, but four trunnions are provided in the lower part for installation in a standing state. The trunnion is provided, which not only increases the complexity and weight of the structure but also increases the cost.

  As what solves such a problem, there exists a thing described in the following patent document 1, for example. In the cask fixing structure described in Patent Document 1, a fixing ring having through holes formed at equal intervals in the circumferential direction is provided on the storage frame, and screw holes are provided at equal intervals in the circumferential direction on the outer peripheral surface of the lower part of the cask. The cask is fixed on the storage stand by fitting the lower part of the cask to the fixing ring and screwing the bolt into the screw hole through the through hole.

JP 2007-248186 A

  By the way, the radioactive substance storage container is installed and supported on the gantry in a state where the radioactive waste is accommodated therein, and is stored in this state for a predetermined period to lower the temperature of the radioactive waste. That is, since the radioactive substance storage container stores radioactive waste whose temperature is unstable and fluctuates in an unstable manner, the dimensions of the outer shape may change due to thermal elongation. Therefore, as in the conventional cask fixing structure, when the cask is fixed by fitting the lower part of the cask into a fixing ring integrated with the gantry and screwing the bolt into the screw hole, the cask (radioactive substance storage container) May not be able to follow the change in the dimensions of the outer shape due to thermal elongation, and may be insufficiently supported.

  This invention solves the subject mentioned above, and it aims at providing the support structure of the stand for radioactive substance storage containers and the radioactive substance storage container which can support a radioactive substance storage container stably over a long period of time. To do.

  In order to achieve the above object, the stand for a radioactive substance storage container according to the present invention is a radioactive substance that vertically supports a radioactive substance storage container in which a small-diameter portion having a smaller diameter than the trunk portion is provided below a cylindrical trunk portion. A storage container gantry comprising a gantry main body, a cylindrical support portion provided on an upper surface portion of the gantry main body and capable of penetrating the small diameter portion, an upper surface portion of the gantry main body, A heat insulating part provided on the inner side, a support lower surface provided between the cylindrical support part and the heat insulating part and having a ring shape capable of supporting the lower surface of the small diameter part, and provided on the inner side of the cylindrical support part And a support side surface having a ring shape capable of supporting the outer surface of the small-diameter portion.

  Therefore, the radioactive substance storage container is supported by a support lower surface having a ring shape on the lower surface of the small-diameter portion, supported by a support side surface having a ring shape on the outer surface, and provided with a heat insulating portion below. While the weight of the container is received by the support lower surface, the lateral load of the radioactive substance storage container is received by the support side surface, and the heat of the radioactive substance storage container is discharged to the outside, thereby changing the external dimensions due to the thermal expansion of the radioactive substance storage container. Accordingly, the radioactive substance storage container can be stably supported over a long period of time.

  In the radioactive substance storage container stand of the present invention, the outer diameter of the heat insulating portion is set to be smaller than the inner diameter of the cylindrical support portion.

  Therefore, it is possible to secure a sufficient area of the heat insulating portion while securing a sufficient area of the support lower surface for receiving the weight of the radioactive substance storage container.

  In the radioactive substance storage container gantry of the present invention, the gantry body is installed on the floor surface by a plurality of legs.

  Therefore, by lifting the gantry body from the floor surface with the plurality of legs, a space can be secured between the gantry body and the floor surface, and the cooling function of the radioactive substance storage container can be improved.

  In the radioactive substance storage container mount of the present invention, the inner diameter of the cylindrical support portion is set to be larger than the outer diameter of the small diameter portion.

  Therefore, by setting the inner diameter of the cylindrical support portion to be larger than the outer diameter of the small diameter portion, it is possible to secure a lateral gap between the cylindrical support portion and the small diameter portion, and the radioactive substance storage container It is possible to absorb dimensional changes in the outer shape due to thermal elongation, and to support the radioactive substance storage container stably over a long period of time.

  In the radioactive substance storage container gantry of the present invention, the cylindrical support portion is provided with a buffer portion having a ring shape on an inner peripheral portion.

  Therefore, by arranging the buffer part between the cylindrical support part and the small diameter part, the dimensional change of the outer shape due to the thermal expansion of the radioactive substance storage container can be absorbed, and the radioactive substance storage container can be stabilized over a long period of time. Can be supported.

  The radioactive substance storage container gantry of the present invention is characterized in that the cylindrical support portion is provided with a plurality of side surface support members that can contact and support the outer surface of the small diameter portion at predetermined intervals in the circumferential direction.

  Therefore, the plurality of side support members partially support the radioactive substance storage container, and can absorb the dimensional change of the outer shape due to the thermal expansion of the radioactive substance storage container, and can stabilize the radioactive substance storage container for a long period of time. Can be supported.

  In the radioactive substance storage container gantry of the present invention, the side support member is provided so as to be movable and adjustable in a radial direction of the cylindrical support portion.

  Therefore, the radioactive substance storage container can be stably supported over a long period of time by adjusting the position of each side support member with respect to the dimensional change of the outer shape due to the thermal expansion of the radioactive substance storage container.

  The support structure for a radioactive substance storage container according to the present invention is a support structure for a radioactive substance storage container that vertically supports a radioactive substance storage container in which a small-diameter portion having a smaller diameter than the trunk portion is provided at a lower portion of a cylindrical trunk portion. The lower surface of the small-diameter portion is supported by a support lower surface formed in a ring shape formed inside the cylindrical support portion of the gantry body, and a ring-shaped support side surface formed inside the cylindrical support portion. A longitudinal gap smaller than the height of the cylindrical support portion is provided between the lower surface of the body portion and the upper surface of the cylindrical support portion.

  Therefore, the radioactive substance storage container is supported by the support lower surface having a ring shape on the lower surface of the small-diameter portion and supported by the support side surface having a ring shape, and the weight of the radioactive substance storage container is received by the support lower surface, By receiving the lateral load of the radioactive substance storage container on the support side and discharging the heat of the radioactive substance storage container to the outside from the vertical gap, it becomes possible to follow the dimensional change of the outer shape due to thermal expansion, and the radioactive substance storage container can be used for a long time Can be stably supported over a wide range.

  According to the support structure for the radioactive substance storage container and the radioactive substance storage container of the present invention, the lower surface of the small-diameter portion of the radioactive substance storage container is supported by the ring-shaped support lower surface, and the outer surface is supported by the ring-shaped support side surface. Therefore, it is possible to appropriately receive the weight and lateral load of the radioactive substance storage container and stably support the radioactive substance storage container for a long period of time.

FIG. 1 is a cross-sectional view illustrating a cask mount as a mount for a radioactive substance storage container according to a first embodiment of the present invention. FIG. 2 is a plan view of the cask mount according to the first embodiment. FIG. 3 is a schematic diagram illustrating a cask support structure by the cask mount according to the first embodiment. FIG. 4 is a partial cross-sectional schematic view of the cask. FIG. 5 is a horizontal sectional view of the cask. FIG. 6 is a schematic diagram illustrating a storage facility for storing cask. FIG. 7 is a plan view illustrating a modified example of the cask mount according to the first embodiment. FIG. 8 is a plan view illustrating a modification of the cask gantry of the first embodiment. FIG. 9 is a schematic diagram showing a cask support structure by a cask gantry as a radioactive substance storage container gantry according to a second embodiment of the present invention. FIG. 10 is a plan view of the cask mount of the second embodiment. FIG. 11 is a schematic view showing a cask support structure by a cask gantry as a radioactive substance storage container gantry according to a third embodiment of the present invention. FIG. 12 is a plan view of the cask gantry of the third embodiment.

  Exemplary embodiments of a support for a radioactive substance storage container and a support structure for a radioactive substance storage container according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a cross-sectional view showing a cask gantry as a gantry for a radioactive substance storage container according to a first embodiment of the present invention, FIG. 2 is a plan view of the cask gantry of the first embodiment, and FIG. FIG. 4 is a schematic partial sectional view of the cask, FIG. 5 is a horizontal sectional view of the cask, and FIG. 6 is a storage facility for storing the cask. FIG.

  In the first embodiment, as shown in FIGS. 4 and 5, the cask 11 as a radioactive substance storage container includes a trunk portion 12 and a lid portion 13. The trunk portion 12 has a cylindrical shape in which an opening 22 is formed on one side of the trunk body 21, that is, an upper portion, and the bottom portion (blocking portion) 23 is formed on the other side, that is, a lower portion. For example, a spent fuel assembly) can be stored. That is, the trunk body 21 is provided with a cavity 24 inside, and the cavity 24 has a shape that matches the outer peripheral shape of the basket 25. And the trunk | drum main body 21 has the bottom part 23 couple | bonded by welding to this lower part, and this trunk | drum main body 21 and the bottom part 23 are forged goods made from carbon steel which has a gamma ray shielding function, but instead of carbon steel Stainless steel can also be used. Also, cast products such as spheroidal graphite cast iron and carbon steel cast steel can be used.

  The basket 25 provided inside the cask 11 is composed of a plurality of square pipes constituting a cell 26 for storing a spent fuel assembly (not shown). This square pipe is made of an aluminum composite material or an aluminum alloy obtained by adding boron or boron compound powder having neutron absorption performance to aluminum or aluminum alloy powder. In addition to boron, gadolinium can be used as the neutron absorber.

  The body portion 12 is provided with an outer cylinder 27 with a predetermined gap on the outer peripheral side of the body main body 21, and conducts heat between the outer peripheral surface of the body main body 21 and the inner peripheral surface of the outer cylinder 27. A plurality of copper heat transfer fins 28 are welded at equal intervals in the circumferential direction. The body 12 is a resin (second neutron shield) containing boron or a boron compound which is a polymer material containing a lot of hydrogen and has a neutron shielding function in the space between the body 21 and the outer cylinder 27. ) 29 is injected through a pipe or the like (not shown) in a fluidized state and solidified. In this case, it is preferable that the heat transfer fins 28 are provided at a high density in a portion having a large amount of heat in order to uniformly dissipate heat.

  The body 12 has a bottom plate 37 connected to the lower side of the bottom 23 by a plurality of connecting plates 30 with a predetermined gap, and a resin (neutron shield) is formed in the space between the bottom 23 and the bottom plate 37. 38 is provided.

  The lid 13 that closes the opening 22 of the trunk body 21 in the trunk 12 is constituted by a primary lid 31 and a secondary lid 32. The primary lid 31 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid 32 also has a disk shape made of stainless steel or carbon steel, and a resin (neutron shield) 33 is sealed on the upper surface thereof. The primary lid 31 and the secondary lid 32 are attached to the upper end portion of the trunk body 21 by bolts 34 made of stainless steel or carbon steel. In this case, metal gaskets (not shown) are interposed between the primary lid 31 and the secondary lid 32 and the trunk body 21, respectively, to ensure the internal sealing performance. Further, an auxiliary shield 36 enclosing the resin 35 is provided around the lid portion 13.

  Moreover, the trunk | drum 12 is provided with the trunnion 41 for lifting the cask 11 in two places of the upper part of the trunk | drum main body 21, and two places of the lower part. In this case, the trunnions 41 are provided at equal intervals in the circumferential direction on the upper portion of the trunk body 21 and at equal intervals in the circumferential direction on the lower portion of the trunk body 21. The cask 11 accommodates the spent fuel assembly therein and is then transported to the storage facility (or reprocessing facility). When the cask 11 is transported, the auxiliary shield attached to the upper end of the trunk 12 is used. The body 36 is removed, and shock absorbers (not shown) are attached to the upper end portion and the lower end portion of the cask 11. This shock absorber has a structure in which a shock absorbing material such as a redwood material is incorporated in a housing made of a stainless steel material. Moreover, after the cask 11 is carried into the storage facility, the buffer body is removed and stored in an upright state using a gantry 50 described later.

  As shown in FIG. 6, the storage facility 101 is entirely composed of concrete walls, and includes an installation floor 102, a ceiling wall 103, and a plurality of side walls 104. The installation floor 102 is provided with a ventilation tower 106 having a large number of air inlets 105 formed on both sides thereof. In the storage facility 101, the cask 11 is arranged on each mount 50 fixed to the installation floor 102, and a plurality of the cask 11 are arranged at predetermined intervals in the horizontal direction. As described above, each cask 11 contains a spent fuel assembly. Further, the storage facility 101 is provided with a loading pit 109 having a loading gate 108 on one side, and the cask 11 is carried into the storage facility 101 from the loading pit 109 by a transport vehicle. In the storage facility 101, a cask transfer crane 110 is movably provided at an upper portion, and the cask 11 carried into the carry-in pit 109 is transferred by the cask transfer crane 110 and is arranged at a predetermined position. .

  As shown in FIGS. 1 to 3, the cask 11 configured in this way is supported on a gantry 50 fixed to the installation floor 102. In this case, the cask 11 is provided with a small-diameter portion 12 a (a bottom plate 37 and a resin 38) having a smaller diameter than the trunk portion 12 at the lower portion of the trunk portion 12. The gantry 50 of Example 1 can support the cask 11 stably by supporting the trunk | drum 12 and the small diameter part 12a of the cask 11. FIG.

  That is, the gantry 50 includes a gantry body 51, a cylindrical support portion 52, and a heat insulating portion 53. The gantry main body 51 has a rectangular shape with a predetermined height, and a plurality of leg portions 54 are fixed to the lower surface. The leg portions 54 are installed by being in close contact with the installation floor 102, and the gantry main body A space A is secured between 51 and the installation floor 102.

  Further, the gantry body 51 is integrally provided with a cylindrical support portion 52 on the upper surface portion. The cylindrical support portion 52 has a cylindrical shape having a predetermined thickness and height, and the small diameter portion 12a of the cask 11 can penetrate inside. Further, the gantry body 51 is formed with a concave portion 55 on the upper surface portion and inside the cylindrical support portion 52, and the concave portion 55 is filled with a heat insulating material to form a heat insulating portion 53.

  The gantry 50 is provided between the cylindrical support portion 52 and the heat insulating portion 53 in a ring shape capable of supporting the lower surface of the small diameter portion 12a, and the small diameter portion provided inside the cylindrical support portion 52. It has the support side surface 57 which makes the ring shape which can support the outer surface of 12a. The support lower surface 56 is formed on the upper surface portion of the gantry body 51 along the substantially horizontal direction and is positioned on the same plane as the upper surface of the heat insulating portion 53, but may be provided slightly above the upper surface of the heat insulating portion 53. Good. The support side surface 57 is formed on the inner peripheral surface of the cylindrical support portion 52 along a substantially vertical direction, and is substantially perpendicular (90 degrees) to the support lower surface 56.

  In this case, the inner diameter R2 of the cylindrical support portion 52 is set to be larger than the outer diameter R1 of the small diameter portion 12a, and the inner peripheral surface (support side surface 57) of the cylindrical support portion 52 and the outer peripheral surface of the small diameter portion 12a A lateral clearance S1 is secured between the two. This lateral clearance S1 is set not only for the purpose of allowing the small diameter portion 12a of the cask 11 to easily penetrate into the cylindrical support portion 52, but also for thermal expansion, design error, manufacturing error, and assembly error of the cask 11. It is set in consideration of such. The lateral gap S1 is desirably made as small as possible to suppress the play when the cask 11 is installed on the gantry 50, but the thermal elongation / error and the cask 11 shown above are installed on the gantry 50. When the fitting at the time is taken into consideration, the value of the lateral clearance S1 is preferably set to several mm.

  Further, by setting the outer diameter R3 of the heat insulating portion 53 to be smaller than the inner diameter R2 of the cylindrical support portion 52, a ring-shaped support having a predetermined width W between the cylindrical support portion 52 and the heat insulating portion 53. A lower surface 56 is formed. It is assumed that the gantry 50 is responsible for the weight of the cask 11 at the support lower surface 56. In order to stably install the cask 11, it is desirable that the upper surface of the support lower surface 56 be flat with respect to the lower surface of the cask 11. Further, when considering the strength with which the cask 11 is responsible for its own weight, it is desirable to make the area of the upper surface of the support lower surface 56 as large as possible compared with the area of the lower surface of the cask 11.

  Further, the cylindrical support portion 52 is set such that the inner peripheral side height, that is, the height H2 of the support side surface 57 is higher than the outer peripheral side height H1, and the height H2 of the support side surface 57 has a small diameter. It is set lower than the height H3 of the portion 12a. Therefore, a vertical gap S <b> 2 is ensured between the lower surface of the trunk portion 12 and the upper surface of the cylindrical support portion 52. The vertical gap S2 is set to a height smaller than the heights H1 and H2 of the cylindrical support portion 52 and the height H3 of the small diameter portion 12a. The vertical gap S2 is set in consideration of the thermal elongation of the cask 11, design error, manufacturing error, assembly error, and the like, so that the lower surface of the body portion 12 does not contact the upper surface of the cylindrical support portion 52. The support lower surface 56 can reliably support the lower surface of the small diameter portion 12a.

  Since the gantry 50 is set in such a shape and size, when the cask 11 is supported by the gantry 50, the small diameter portion 12a penetrates into the cylindrical support portion 52. At this time, the outer side of the lower surface of the small diameter portion 12 a is supported by the support lower surface 56 of the gantry body 51 and the outer peripheral surface of the small diameter portion 12 a is supported by the support side surface 57 of the cylindrical support portion 52. A lateral clearance S1 is secured between the outer peripheral surface of the small diameter portion 12a and the support side surface 57, while a longitudinal clearance S2 is secured between the lower surface of the body portion 12 and the upper surface of the cylindrical support portion 52. ing. Therefore, the gantry 50 can follow the dimensional change of the outer shape due to the thermal expansion of the cask 11 and can stably support the cask 11.

  As described above, in the cask gantry of the first embodiment, the gantry body 51, the cylindrical support portion 52 that is provided on the upper surface portion of the gantry body 51 and into which the small-diameter portion 12a can penetrate, and the upper surface portion of the gantry body 51 In addition, a heat insulating portion 53 provided inside the cylindrical support portion 52, and a support lower surface 56 that is provided between the cylindrical support portion 52 and the heat insulating portion 53 and has a ring shape capable of supporting the lower surface of the small diameter portion 12a. And a support side surface 57 that is provided inside the cylindrical support portion 52 and has a ring shape capable of supporting the outer surface of the small diameter portion 12a.

  Accordingly, the cask 11 is supported by the support lower surface 56 in which the lower surface of the small diameter portion 12a has a ring shape, and the outer surface of the small diameter portion 12a is supported by the support side surface 57 in the shape of a ring. While being received at 56, the lateral load of the cask 11 is received at the support side surface 57. Therefore, the cask 11 has the small-diameter portion 12a penetrating inside the cylindrical support portion 52 and is received only by the support lower surface 56 and the support side surface 57 that are orthogonal to each other and are not connected to each other. Therefore, the gantry 50 can follow the dimensional change of the outer shape due to the thermal expansion of the cask 11, and the cask 11 can be stably supported over a long period of time. Moreover, since the heat insulation part 53 is provided below the cask 11, the heat of the cask is discharged to the outside instead of below, and the cooling efficiency can be improved.

  In the cask gantry of the first embodiment, the outer diameter of the heat insulating portion 53 is set to be smaller than the inner diameter of the cylindrical support portion 52. Therefore, it is possible to secure a sufficient area for the heat insulating portion 53 while securing a sufficient area for the support lower surface 56 to receive the weight of the cask 11.

  In the cask gantry of the first embodiment, the gantry body 51 is installed on the installation floor 102 by a plurality of legs 54. Therefore, by lifting the gantry body 51 from the installation floor 102 by the plurality of legs 54, the space portion A can be secured between the gantry body 51 and the installation floor 102, and the cooling function of the cask 11 is improved. Can do.

  In the cask mount of Example 1, the inner diameter of the cylindrical support portion 52 is set to be larger than the outer diameter of the small diameter portion 12a. Accordingly, it is possible to secure a lateral gap between the cylindrical support portion 52 and the small diameter portion 12a, and to absorb the dimensional change of the outer shape due to the thermal expansion of the cask 11, and to stabilize the cask over a long period of time. Can be supported. In this case, by setting the lateral gap amount to an appropriate value, the gantry 50 can follow the dimensional change of the outer shape due to the thermal expansion of the cask 11, while the support side 57 moves the cask 11 horizontally. Even in this case, the outer surface of the small diameter portion 12a can be properly supported.

  Further, in the cask support structure of the first embodiment, the lower surface of the small diameter portion 12a is supported by the support lower surface 56 having a ring shape formed inside the cylindrical support portion 52 of the gantry body 51, and the cylindrical shape. A vertical gap smaller than the height of the cylindrical support portion 52 is supported between a support side surface 57 having a ring shape formed inside the support portion 52 and between the lower surface of the trunk portion 12 and the upper surface of the cylindrical support portion 52. Is provided.

  Accordingly, the weight of the cask 11 is received by the support lower surface 56, while the lateral load of the cask 11 is received by the support side surface 57, and the heat of the cask 11 is discharged to the outside from the vertical gap, thereby changing the external dimensions due to thermal expansion. The cask 11 can be supported stably over a long period of time.

  In the above-described embodiment, the cylindrical support portion 52 has a cylindrical shape, but is not limited to this shape. 7 and 8 are plan views illustrating modifications of the cask gantry of the first embodiment.

  As shown in FIG. 7, the gantry 60 includes a gantry body 61, a cylindrical support portion 62, and a heat insulating portion 63. Here, the gantry body 61 and the heat insulating portion 63 are configured in the same manner as the gantry main body 51 and the heat insulating portion 53. The cylindrical support portion 62 is configured by concentrically arranging a plurality of (here, four) curved walls 62a, 62b, 62c, and 62d that form an arc shape. In this case, the number of divisions is not limited to four.

  As shown in FIG. 8, the gantry 70 has a gantry body 71, a cylindrical support portion 72, and a heat insulating portion 73. Here, the gantry main body 71 and the heat insulating portion 73 are configured in the same manner as the gantry main body 51 and the heat insulating portion 53. The cylindrical support part 72 is configured by concentrically arranging a plurality (16 in this case) of support pillars 72a, 72b, 72c, 72d having a cylindrical shape. In this case, the number of divisions is not limited to 16, and the shape of the support columns 42a, 72b, 72c, 72d is not limited to a cylindrical shape.

  In this case, the gantry 60, 70, like the gantry 50, has a support lower surface 66, 76 having a ring shape capable of supporting the lower surface of the small diameter portion 12a, and a support side surface having a ring shape capable of supporting the outer surface of the small diameter portion 12a. 67, 77.

  FIG. 9 is a schematic view showing a cask support structure by a cask gantry as a radioactive substance storage container gantry according to the second embodiment of the present invention, and FIG. 10 is a plan view of the cask gantry according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIGS. 9 and 10, the cask 11 is supported on a gantry 80 fixed to the installation floor 102. The gantry 80 includes a gantry body 81, a cylindrical support portion 82, and a heat insulating portion 83. The gantry body 81 has a plurality of legs 84 fixed to the lower surface thereof, and each leg 84 is installed by being in close contact with the installation floor 102, and the space A between the gantry body 81 and the installation floor 102. Is secured.

  Further, the gantry body 81 is integrally provided with a cylindrical support portion 82 on the upper surface portion, and the small diameter portion 12a of the cask 11 can penetrate inside the cylindrical support portion 82. Further, the gantry body 81 has a recess 85 formed inside the cylindrical support portion 82, and the recess 85 is filled with a heat insulating material to form a heat insulating portion 83.

  The gantry 80 is provided between the cylindrical support portion 82 and the heat insulating portion 83 in a ring shape that can support the lower surface of the small diameter portion 12a, and the small diameter portion provided inside the cylindrical support portion 82. It has the support side surface 87 which makes the ring shape which can support the outer surface of 12a. The support lower surface 86 is formed on the upper surface portion of the gantry main body 81 in a substantially horizontal direction and is positioned substantially on the same surface as the upper surface of the heat insulating portion 83, but may be provided slightly above the upper surface of the heat insulating portion 83. Good. The support side surface 87 is formed on the inner peripheral surface of the cylindrical support portion 82 along a substantially vertical direction, and is substantially perpendicular (90 degrees) to the support lower surface 86.

  Further, the gantry 80 is provided with a ring-shaped buffer member (buffer section) 88 on the inner peripheral portion of the cylindrical support section 82. The buffer member 88 is made of an elastic member and is disposed on the support side surface 87. In this case, as in the first embodiment, the inner diameter of the cylindrical support portion 82 is set to be larger than the outer diameter of the small diameter portion 12a, and a lateral clearance is secured here. The buffer member 88 is set to have a thickness equal to or smaller than the lateral gap.

  Other configurations are the same as those in the first embodiment.

  Therefore, when the cask 11 is supported by the gantry 80, the small diameter portion 12 a penetrates inside the cylindrical support portion 82. At this time, in the cask 11, the lower surface of the small diameter portion 12a is supported by the support lower surface 86 of the gantry body 81, and the outer peripheral surface of the small diameter portion 12a is supported by the support side surface 87 of the cylindrical support portion 82 via the buffer member 88. Is done.

  As described above, in the cask gantry of the second embodiment, the gantry body 81, the cylindrical support portion 82, and the heat insulating portion 83 are provided, the support lower surface 86 capable of supporting the lower surface of the small diameter portion 12a, and the small diameter portion 12a. A support side surface 87 capable of supporting the outer surface of the cylindrical support portion 82 is provided, and a buffer member 88 having a ring shape is provided on the inner peripheral portion of the cylindrical support portion 82, that is, the support side surface 87.

  Therefore, the cask 11 has the lower surface of the small-diameter portion 12 a supported by the support lower surface 86 and the outer surface of the small-diameter portion 12 a is supported by the support side surface 87 via the buffer member 88. On the other hand, the lateral load of the cask 11 is received by the support side surface 87 via the buffer member 88. Therefore, the gap amount between the cask 11 and the cylindrical support portion 82 (support side surface 87) is reduced, and the gantry 80 can absorb the dimensional change of the outer shape due to the thermal expansion of the cask 11. It can be supported stably over a period of time.

  FIG. 11 is a schematic view showing a cask support structure by a cask gantry as a radioactive substance storage container gantry according to a third embodiment of the present invention, and FIG. 12 is a plan view of the cask gantry according to the third embodiment.

  In the third embodiment, as shown in FIGS. 11 and 12, the cask 11 is supported on a gantry 90 fixed to the installation floor 102. The gantry 90 includes a gantry body 91, a cylindrical support portion 92, and a heat insulating portion 93. A plurality of legs 94 are fixed to the bottom surface of the gantry main body 91, and each leg 94 is installed in close contact with the installation floor 102, and a space portion A is provided between the gantry main body 91 and the installation floor 102. Is secured.

  Further, the gantry body 91 is integrally provided with a cylindrical support portion 92 on the upper surface portion, and the small diameter portion 12a of the cask 11 can be penetrated into the cylindrical support portion 92 inside. Further, the gantry body 91 has a recess 95 formed inside the cylindrical support portion 92, and a heat insulating material 93 is filled in the recess 95 to form a heat insulating portion 93.

  The gantry 90 is provided between the cylindrical support portion 92 and the heat insulating portion 93 in a ring shape that can support the lower surface of the small diameter portion 12a, and the small diameter portion provided inside the cylindrical support portion 92. It has a supporting side surface 97 having a ring shape capable of supporting the outer surface of 12a. The support lower surface 96 is formed in a substantially horizontal direction on the upper surface portion of the gantry main body 91 and is positioned substantially on the same surface as the upper surface of the heat insulating portion 93, but may be provided slightly above the upper surface of the heat insulating portion 93. Good. The support side surface 97 is formed on the inner peripheral surface of the cylindrical support portion 92 along a substantially vertical direction, and is substantially perpendicular to the support lower surface 96 (90 degrees).

  In addition, the gantry 90 is provided with a plurality (four in this embodiment) of side surface support members 98 that are in contact with the outer peripheral surface of the small-diameter portion 12a and support the outer peripheral surface of the small-diameter portion 12a at predetermined intervals in the circumferential direction. ing. The side support member 98 is a screw member, and is screwed along the radial direction of the cylindrical support portion 92 and rotated to move along the radial direction of the cylindrical support portion 92 to adjust its position. It is possible. In this case, as in the first embodiment, the inner diameter of the cylindrical support portion 92 is set to be larger than the outer diameter of the small diameter portion 12a, and a lateral clearance is secured here. Each side surface support member 98 moves in the radial direction of the cylindrical support portion 92, and by adjusting the amount of the lateral clearance, the outer peripheral surface of the small diameter portion 12 a can be properly supported by the tip portion. .

  Other configurations are the same as those in the first embodiment.

  Therefore, when the cask 11 is supported by the gantry 90, the small diameter portion 12 a penetrates inside the cylindrical support portion 92. At this time, in the cask 11, the lower surface of the small diameter portion 12a is supported by the support lower surface 96 of the gantry body 91, and the outer peripheral surface of the small diameter portion 12a is the support side surface 97 of the cylindrical support portion 92, that is, a plurality of side surface support members. 98.

  As described above, in the cask gantry of the third embodiment, the gantry body 91, the cylindrical support portion 92, and the heat insulating portion 93 are provided, the support lower surface 96 capable of supporting the lower surface of the small diameter portion 12a, and the small diameter portion 12a. And a plurality of side surface support members 98 that can be supported in contact with the outer surface of the small diameter portion 12a at a predetermined interval in the circumferential direction.

  Accordingly, the cask 11 has the lower surface of the small-diameter portion 12a supported by the support lower surface 96, and the outer surface of the small-diameter portion 12a is supported by the support side surface 97, that is, the plurality of side surface support members 98, thereby supporting the weight of the cask 11. While being received by the lower surface 96, the lateral load of the cask 11 is received by the support side surface 97 via the side surface support members 98. Therefore, the gap amount between the cask 11 and the cylindrical support portion 92 (support side surface 97) is reduced, and the gantry 90 can absorb the dimensional change of the outer shape due to the thermal expansion of the cask 11. It can be supported stably over a period of time.

  In the cask gantry of the third embodiment, the side support member 98 is provided so as to be movable and adjustable in the radial direction of the cylindrical support portion 92. Therefore, the cask 11 can be stably supported over a long period of time by adjusting the position of each side support member 98 with respect to the dimensional change of the outer shape due to the thermal elongation of the cask 11.

11 Cask (radioactive substance storage container)
12 trunk portion 12a small diameter portion 13 lid portion 50, 60, 70, 80, 90 mount base 51, 61, 71, 81, 91 mount main body 52, 62, 72, 82, 92 cylindrical support portions 53, 63, 73, 83 , 93 Heat insulation part 54, 84, 94 Leg part 56, 66, 76, 86, 96 Support lower surface 57, 67, 77, 87, 97 Support side surface 88 Buffer member (buffer part)
98 Side support member

Claims (8)

A radioactive substance storage container gantry that vertically supports a radioactive substance storage container in which a small diameter part having a diameter smaller than that of the cylindrical part is provided at a lower part of a cylindrical body part,
The gantry body;
A cylindrical support provided on the upper surface of the gantry body and allowing the small diameter portion to penetrate;
A heat insulating part provided on the inside of the cylindrical support part on the upper surface part of the gantry body;
A support lower surface formed in a ring shape provided between the cylindrical support portion and the heat insulating portion and capable of supporting the lower surface of the small diameter portion;
A support side surface that is provided inside the cylindrical support portion and has a ring shape capable of supporting the outer surface of the small diameter portion;
With
At least a lateral gap between the support side surface and the outer peripheral surface of the small-diameter portion that can follow the dimensional change of the outer shape due to thermal elongation, and between the lower surface of the trunk portion and the upper surface of the cylindrical support portion the by height by Rinetsu elongation of the cylindrical support portion enough to follow the dimensional change of the outer shape smaller again vertical direction gap is provided,
A stand for a radioactive substance storage container.   2. The radioactive substance storage container pedestal according to claim 1, wherein an outer diameter of the heat insulating portion is set to be smaller than an inner diameter of the cylindrical support portion.   The said gantry main body is installed in a floor surface by a some leg part, The gantry for radioactive substance storage containers of Claim 1 or 2 characterized by the above-mentioned.   The radioactive substance storage container pedestal according to any one of claims 1 to 3, wherein an inner diameter of the cylindrical support portion is set to be larger than an outer diameter of the small diameter portion.   5. The radioactive substance storage container pedestal according to claim 4, wherein the cylindrical support part is provided with a buffer part having a ring shape on an inner peripheral part. 6.   6. The radioactive substance storage container according to claim 4, wherein the cylindrical support part is provided with a plurality of side surface support members that can contact and support the outer surface of the small-diameter part at a predetermined interval in the circumferential direction. Mount.   The said side surface supporting member is provided so that a movement adjustment is possible to the radial direction of the said cylindrical support part, The gantry for radioactive substance storage containers of Claim 6 characterized by the above-mentioned. A support structure of a radioactive substance storage container that vertically supports a radioactive substance storage container in which a small diameter part having a smaller diameter than the trunk part is provided at a lower part of a cylindrical body part,
The lower surface of the small diameter portion is provided on the upper surface portion of the gantry main body, the inside of the cylindrical support portion through which the small diameter portion can penetrate, and the heat insulating portion provided on the upper surface portion of the gantry main body inside the cylindrical support portion; And is supported by a ring-shaped support side surface formed on the inner side of the cylindrical support portion, and at least the lower surface of the trunk portion and the cylindrical support. small vertical direction gap enough to follow the dimensional change of the outer shape due to thermal expansion than the height of the cylindrical support along with provided between the upper surface of the parts, heat between the outer peripheral surface of the support side and a small diameter portion A lateral clearance is provided that can follow the dimensional change of the outer shape due to elongation .
A support structure for a radioactive substance storage container.

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