JP2014077775A - Frame for radioactive substance storage container and manufacturing method thereof and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame for radioactive substance storage container and a manufacturing method thereof and a structure, wherein a radioactive substance storage container is stably supported for long term.SOLUTION: A frame for radioactive substance storage container is provided with a main body of frame 51, a tubular support part 52 which is provided at an upper surface of the main body of frame 51 and can be penetrated by a small diameter part 12a, a thermal insulation part 53 which is provided at the upper surface of the main body of frame 51 and inside of the tubular support part 52, and a cooling part having a support side 57 as a heating surface which is provided at the tubular support part 52 and can contact with the small diameter part 12a and an upper surface 58 as a heat radiation surface not contacting with the small diameter part 12a.

Description

  TECHNICAL FIELD The present invention relates to a radioactive substance storage container stand for storing, transporting and storing radioactive waste, a method for manufacturing the same, and a structure in which the radioactive substance storage container is supported by the radioactive substance storage container stand. .

  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 a gantry in a state where high-temperature radioactive waste is stored therein, and is stored for a predetermined period in this state to lower the temperature of the radioactive waste. In other words, the radioactive substance storage container needs to be cooled efficiently because heat is transferred from the radioactive waste inside and the temperature of the outside rises.

  This invention solves the subject mentioned above, and it aims at providing the stand for radioactive substance storage containers which can cool a radioactive substance storage container efficiently over a long period of time, its manufacturing method, and a structure.

  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, It is provided with a heat insulating part provided inside, a cooling part which is provided in the cylindrical support part and has a heat transfer surface which can contact the small diameter part and a heat radiation surface which does not contact the small diameter part. Is.

  Therefore, in the radioactive substance storage container, the small diameter portion penetrates and is supported by the cylindrical support portion, and heat transfer from the small diameter portion to the lower portion of the gantry body is suppressed by the heat insulating portion, while the heat of the small diameter portion is transferred to the heat transfer surface. Then, the radioactive substance storage container is cooled by being transmitted to the cylindrical support portion and discharged from the heat radiation surface to the outside, and the radioactive substance storage container can be efficiently cooled over a long period of time.

  In the radioactive substance storage container gantry of the present invention, the heat transfer surface is formed on an inner peripheral surface of the cylindrical support portion, and the heat dissipation surface is formed on an upper surface and an outer peripheral surface of the cylindrical support portion. It is characterized by.

  Accordingly, the heat of the small diameter portion is transferred from the heat transfer surface to the cylindrical support portion, and is released to the atmosphere from the heat dissipation surface formed on the upper surface and the outer peripheral surface of the cylindrical support portion, thereby efficiently cooling the radioactive substance storage container. can do.

  In the radioactive substance storage container gantry of the present invention, the heat radiating surface has fins formed in a corrugated shape on an outer peripheral surface of the cylindrical support portion.

  Therefore, the heat of the radioactive substance storage container can be efficiently released to the atmosphere from the fins formed in a corrugated shape via the cylindrical support portion.

  In the radioactive substance storage container gantry of the present invention, the heat radiating surface has a plurality of fins provided in a plate shape on the outer peripheral surface of the cylindrical support portion.

  Therefore, the heat of the radioactive substance storage container can be efficiently released to the atmosphere from the plurality of fins provided in a plate shape via the cylindrical support portion.

  In the radioactive substance storage container mount of the present invention, the heat radiating surface has a plurality of fins provided in a groove shape on the outer peripheral surface of the cylindrical support portion.

  Therefore, the heat of the radioactive substance storage container can be efficiently released to the atmosphere from the plurality of fins provided in the groove shape via the cylindrical support portion.

  In the radioactive substance storage container gantry according to the present invention, the cooling unit includes a cooling device that cools the gantry body or the cylindrical support unit.

  Therefore, the radioactive substance storage container can be efficiently cooled by cooling the gantry body or the cylindrical support portion with the cooling device.

  The radioactive substance storage container gantry of the present invention is characterized in that a plurality of the gantry main bodies are vertically stacked.

  Therefore, by arranging a plurality of gantry main bodies vertically, it is possible to expand the heat radiation area and efficiently cool the radioactive substance storage container.

  In the radioactive substance storage container gantry of the present invention, the gantry body is set to have a width larger than the diameter of the radioactive substance storage container, and is installed on the floor surface by legs provided at each end.

  Therefore, the base body is set to be wider than the radioactive substance storage container, and installed on the floor surface by the legs provided at each end, thereby expanding the heat radiation area and efficiently cooling the radioactive substance storage container. In addition, 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 gantry according to the present invention, the gantry body is provided with a through hole along the vertical direction inside the cylindrical support portion, and the heat insulating portion is provided so as to close the through hole. It is a feature.

  Therefore, by providing a through-hole inside the cylindrical support portion in the gantry body, it is possible to reduce the amount of material that uses an unnecessary portion as a space and to reduce the cost.

  In the radioactive substance storage container gantry of the present invention, the through hole is provided with a stepped portion, and the stepped portion is provided with a heat shielding member constituting the heat insulating portion.

  Therefore, by providing the heat shielding member at the stepped portion provided in the through hole, the heat transmitted from the radioactive substance storage container mount to the floor surface can be efficiently reduced.

  In the radioactive substance storage container gantry of the present invention, the heat radiating surface has fins formed along a circumferential direction on an outer peripheral surface of the cylindrical support portion.

  Therefore, the heat of the radioactive substance storage container can be efficiently released to the atmosphere from the fins formed along the circumferential direction via the cylindrical support portion, and the cooling that flows in the horizontal direction since the fins are along the circumferential direction. The flow can be properly guided to the heat dissipation surface.

  The manufacturing method of the radioactive substance storage container pedestal of the present invention is characterized in that the above-described radioactive substance storage container pedestal is formed by casting.

  Therefore, it is possible to reduce the manufacturing cost by reducing machining such as cutting. Moreover, since the surface of the mount for radioactive substance storage containers becomes a cast skin, the heat dissipation area can be increased to improve the heat dissipation efficiency.

  The structure of the present invention is characterized in that a radioactive substance storage container is supported on the radioactive substance storage container stand.

  Therefore, the radioactive substance storage container can be efficiently cooled over a long period of time.

  According to the radioactive substance storage container gantry and the manufacturing method and structure thereof of the present invention, the heat transfer surface is provided on the upper surface of the gantry main body and is provided with a heat insulating portion inside the cylindrical support portion and is capable of contacting the small diameter portion. And a heat radiating surface that does not come into contact with the small diameter portion, heat transfer from the small diameter portion to the gantry body is suppressed by the heat insulating portion, while heat from the small diameter portion is transferred from the heat transfer surface to the cylindrical support portion. The radioactive substance storage container is cooled by being discharged from the heat radiation surface to the outside, and the radioactive substance storage container can be efficiently cooled over 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 plan view of a cask mount as a mount for a radioactive substance storage container according to a second embodiment of the present invention. FIG. 10 is a perspective view of the cask cradle of the second embodiment. FIG. 11 is a plan view of a cask mount as a mount for a radioactive substance storage container according to Embodiment 3 of the present invention. FIG. 12 is a perspective view of the cask cradle of the third embodiment. FIG. 13 is a perspective view of a cask mount as a mount for a radioactive substance storage container according to a fourth embodiment of the present invention. FIG. 14 is a perspective view of a cask gantry as a radioactive substance storage container gantry according to a fifth embodiment of the present invention. FIG. 15 is a schematic view illustrating a cask support structure by a cask gantry as a radioactive material storage container gantry according to a sixth embodiment of the present invention. FIG. 16 is a schematic diagram illustrating a cask support structure by a cask gantry as a radioactive material storage container gantry according to a seventh embodiment of the present invention. FIG. 17 is a cross-sectional view illustrating a cask mount as a mount for a radioactive substance storage container according to an eighth embodiment of the present invention. FIG. 18 is a cross-sectional view illustrating a cask mount as a mount for a radioactive substance storage container according to Embodiment 9 of the present invention.

  Exemplary embodiments of a radioactive substance storage container gantry, a manufacturing method thereof, and a structure 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. After the spent fuel assembly is stored inside the cask 11, the cask 11 is transported to a storage facility (or reprocessing facility). When the cask 11 is transported, an auxiliary shield attached to the upper end of the trunk 12 is used. 36 is removed, and shock absorbers (not shown) are attached to the upper and lower ends 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 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. The cask 11 is a structure supported by the gantry 50.

  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 R1 of the cylindrical support portion 52 is set to be slightly larger than the outer diameter of the small diameter portion 12a, and a clearance is secured, so that the small diameter portion 12a can penetrate into the cylindrical support portion 52. . Further, by setting the outer diameter R2 of the heat insulating portion 53 to be smaller than the inner diameter R1 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.

  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 is secured between the lower surface of the body portion 12 and the upper surface 58 of the cylindrical support portion 52. The vertical gap S 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 S is set in consideration of the thermal elongation, design error, manufacturing error, assembly error, etc. of the cask 11, and the lower surface of the body portion 12 does not contact the upper surface 58 of the cylindrical support portion 52. In addition, the support lower surface 56 can reliably support the lower surface of the small diameter portion 12a.

  In this embodiment, when the cask 11 is supported by the gantry 50, the support side surface 57 of the cylindrical support portion 52 comes into contact with the outer surface of the small diameter portion 12a. Therefore, the support side surface 57 functions as the heat transfer surface of the present invention. To do. Further, when the cask 11 is supported by the gantry 50, the upper surface 58 of the cylindrical support portion 52 is not in contact with the lower surface of the trunk portion 12, and the vertical gap S is secured. It functions as a heat dissipation surface. Furthermore, since the outer peripheral surface 59 does not contact the cask 11, the outer peripheral surface 59 also functions as a heat radiating surface of the present invention. The support side surface 57 serving as the heat transfer surface, the upper surface 58 serving as the heat radiating surface, and the outer peripheral surface 59 constitute the cooling unit of the present invention.

  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. And while the outer peripheral surface of the small diameter part 12a contacts the support side surface 57, the vertical direction clearance S is ensured between the lower surface of the trunk | drum 12, and the upper surface 58 of the cylindrical support part 52. FIG. Therefore, the heat of the cask 11 is transmitted from the small diameter portion 12 a to the cylindrical support portion 52 of the gantry 50 via the support side surface 57 and is released to the atmosphere via the upper surface 58 and the outer peripheral surface 59.

  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 The heat insulating portion 53 provided inside the cylindrical support portion 52, the support side surface 57 as the heat transfer surface provided on the cylindrical support portion 52 and capable of contacting the small diameter portion 12a, and the heat radiation not contacting the small diameter portion 12a. And a cooling unit having an upper surface 58 as a surface.

  Therefore, the cask 11 is supported by the small diameter portion 12a penetrating into the cylindrical support portion 52, and heat transfer from the small diameter portion 12a to the lower portion of the gantry body 51 is suppressed by the heat insulating portion 53, while the heat of the small diameter portion 12a is suppressed. Is transmitted from the support side surface 57 to the cylindrical support portion 52 and discharged from the upper surface 58 to the outside, whereby the cask 11 is uniformly cooled in the circumferential direction, and the cask 11 can be efficiently cooled over a long period of time. Can do.

  In the cask mount of the first embodiment, the upper surface 58 and the outer peripheral surface 59 of the cylindrical support portion 52 are provided as heat dissipation surfaces. Accordingly, the heat of the small-diameter portion 12a is transmitted from the support side surface 57 to the cylindrical support portion 52 and is released to the atmosphere from the upper surface 58 and the outer peripheral surface 59 of the cylindrical support portion 52, and the cask 11 can be efficiently cooled. it can.

  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 pillars 72a, 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. The support side surfaces 67 and 77 function as the heat transfer surface of the present invention, and the upper surfaces 68 and 78 and the outer peripheral surfaces 69 and 79 function as the heat dissipation surface of the present invention.

  FIG. 9 is a plan view of a cask gantry as a radioactive substance storage container gantry according to the second embodiment of the present invention, and FIG. 10 is a perspective 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 Example 2, as shown in FIGS. 9 and 10, the gantry 200 includes a gantry body 201, a cylindrical support portion 202, and a heat insulating portion 203. The gantry body 201 has a plurality of legs 204 fixed to its lower surface. Further, the gantry body 201 is integrally provided with a cylindrical support portion 202 on the upper surface portion, and the small diameter portion of the cask can penetrate inside the cylindrical support portion 202. Further, the gantry body 201 has a recess 205 formed inside the cylindrical support portion 202, and the recess 205 is filled with a heat insulating material to form a heat insulating portion 203.

  The gantry 200 is provided between the cylindrical support portion 202 and the heat insulating portion 203 in a ring shape that can support the lower surface of the small diameter portion, and the cylindrical support portion 202 is provided on the inner side of the small diameter portion. A support side surface 207 having a ring shape capable of supporting the outer surface is provided.

  In this embodiment, when the cask is supported by the gantry 200, the support side surface 207 of the cylindrical support portion 202 comes into contact with the outer surface of the small diameter portion, so that the support side surface 207 functions as the heat transfer surface of the present invention. Further, when the cask is supported by the gantry 200, the upper surface 208 of the cylindrical support portion 202 is not in contact with the lower surface of the trunk portion, so that a vertical gap is ensured. Function. Further, the cylindrical support portion 202 has a corrugated fin 209 formed on the outer peripheral surface, and the fin 209 increases the contact area with the air as compared with the cylindrical support portion 202. Functions as a heat dissipation surface. The cooling side of the present invention is configured by the support side surface 207 as the heat transfer surface, the upper surface 208 as the heat dissipation surface, and the fins 209.

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

  For this reason, when the cask is supported by the gantry 200, the small-diameter portion penetrates into the cylindrical support portion 202. At this time, the lower surface of the small diameter portion of the cask is supported by the support lower surface 206 of the gantry body 201, and the outer peripheral surface of the small diameter portion is supported by the support side surface 207 of the cylindrical support portion 202. The outer peripheral surface of the small diameter portion is in contact with the support side surface 207, while a vertical gap is secured between the lower surface of the trunk portion and the upper surface 208 of the cylindrical support portion 202. Therefore, the heat of the cask is transmitted from the small diameter portion to the cylindrical support portion 202 of the gantry 200 through the support side surface 207 from the small diameter portion in a straight line through the gantry 200 and through the upper surface 208 and the fins 209. Released to the atmosphere at all points along the transmission path.

  As described above, in the cask gantry of the second embodiment, the gantry main body 201, the cylindrical support portion 202, and the heat insulating portion 203 are provided, and the heat transfer that is provided on the cylindrical support portion 202 and can contact the small diameter portion. A support side surface 207 as a surface and a cooling portion having a top surface 208 as a heat dissipation surface and fins 209 that do not contact the small diameter portion are provided.

  Accordingly, the cask is supported by the small diameter portion penetrating into the cylindrical support portion 202, and heat transfer from the small diameter portion to the lower portion of the gantry body 201 is suppressed by the heat insulating portion 203, while the heat of the small diameter portion is supported by the support side surface 207. Is transferred from the upper surface 208 and the fins 209 to the outside, whereby the cask is uniformly cooled in the circumferential direction, and the cask can be efficiently cooled over a long period of time.

  In this case, by forming the corrugated fin 209 on the outer peripheral surface of the cylindrical support portion 202, the cylindrical support portion 202 has a large heat radiation area in contact with the atmosphere, and the fin 209 efficiently radiates heat to the atmosphere. can do. Further, the cylindrical support portion 202 is integrally formed with the corrugated fins 209 on the outer peripheral surface, so that the bending rigidity is increased, the cask which is a heavy object is reliably supported, and the fall prevention ability is improved. be able to.

  FIG. 11 is a plan view of a cask mount as a mount for a radioactive substance storage container according to a third embodiment of the present invention, and FIG. 12 is a perspective view of the cask mount of the third 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 third embodiment, as illustrated in FIGS. 11 and 12, the gantry 210 includes a gantry body 211, a cylindrical support portion 212, and a heat insulating portion 213. The gantry body 211 has a plurality of legs 214 fixed to the lower surface. Further, the gantry body 211 is integrally provided with a cylindrical support portion 212 on an upper surface portion, and the cylindrical support portion 212 is capable of penetrating a small diameter portion of the cask inside. Further, the gantry body 211 has a recess 215 formed inside the cylindrical support portion 212, and the recess 215 is filled with a heat insulating material to form a heat insulating portion 213.

  The gantry 210 is provided between the cylindrical support portion 212 and the heat insulating portion 213 in a ring shape that can support the lower surface of the small diameter portion, and on the inner side of the cylindrical support portion 212. A support side surface 217 having a ring shape capable of supporting the outer surface is provided.

  In the present embodiment, when the cask is supported by the gantry 210, the support side surface 217 of the cylindrical support portion 212 contacts the outer surface of the small diameter portion, so that the support side surface 217 functions as the heat transfer surface of the present invention. Further, when the cask is supported by the gantry 210, the upper surface 218 of the cylindrical support portion 212 does not contact the lower surface of the trunk portion, and a vertical gap is secured, so this upper surface 218 serves as a heat dissipation surface of the present invention. Function. Further, the cylindrical support portion 212 is formed with plate-shaped fins 219 on the outer peripheral surface, and the fins 219 also function as heat dissipation surfaces of the present invention. In this case, a large number of plate-shaped fins 219 may be manufactured and fixed to the outer peripheral surface of the cylindrical support portion 212 at equal intervals in the circumferential direction by welding. And the cooling part of this invention is comprised by the support side 217 as this heat-transfer surface, the upper surface 218 as a heat radiating surface, and the fin 219. FIG.

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

  For this reason, when the cask is supported by the gantry 210, the small diameter portion penetrates into the cylindrical support portion 212. At this time, the lower surface of the small diameter portion of the cask is supported by the support lower surface 216 of the gantry body 211, and the outer peripheral surface of the small diameter portion is supported by the support side surface 217 of the cylindrical support portion 212. The outer peripheral surface of the small diameter portion is in contact with the support side surface 217, while a vertical gap is secured between the lower surface of the trunk portion and the upper surface 218 of the cylindrical support portion 212. Therefore, the heat of the cask is transmitted from the small diameter portion to the cylindrical support portion 212 of the gantry 210 via the support side surface 217 and is released to the atmosphere via the upper surface 218 and the fins 219.

  As described above, in the cask gantry of the third embodiment, the gantry body 211, the cylindrical support portion 212, and the heat insulating portion 213 are provided, and the heat transfer that is provided on the cylindrical support portion 212 and can contact the small diameter portion. A support side surface 217 as a surface and a cooling portion having an upper surface 218 as a heat dissipation surface and fins 219 that do not contact the small diameter portion are provided.

  Accordingly, the cask is supported by the small diameter portion penetrating into the cylindrical support portion 212, and heat transfer from the small diameter portion to the lower portion of the gantry body 211 is suppressed by the heat insulating portion 213, while the heat of the small diameter portion is supported by the support side surface 217. Then, the cask is uniformly cooled in the circumferential direction by being transmitted from the upper surface 218 and the fins 219 to the outside, and can be efficiently cooled over a long period of time.

  In this case, by forming the fin 219 having a plate shape on the outer peripheral surface of the cylindrical support portion 212, the cylindrical support portion 212 has a large heat radiation area in contact with the atmosphere, and the fin 219 efficiently radiates heat to the atmosphere. can do.

  FIG. 13 is a perspective view of a cask mount as a mount for a radioactive substance storage container according to a fourth embodiment of the present invention. 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 fourth embodiment, as illustrated in FIG. 13, the gantry 220 includes a gantry body 221, a cylindrical support portion 222, and a heat insulating portion 223. The gantry body 221 has a plurality of legs 224 fixed to the lower surface. Further, the gantry body 221 is integrally provided with a cylindrical support portion 222 on the upper surface portion, and the small diameter portion of the cask can penetrate the cylindrical support portion 222 inside. Furthermore, the gantry body 221 has a recess 225 formed inside the cylindrical support portion 222, and a heat insulating material is filled in the recess 225 to form a heat insulating portion 223.

  The pedestal 220 is provided between the cylindrical support portion 222 and the heat insulating portion 223 in a ring shape that can support the lower surface of the small diameter portion, and the inner side of the cylindrical support portion 222. A support side surface 227 having a ring shape capable of supporting the outer surface is provided.

  In this embodiment, when the cask is supported by the gantry 220, the support side surface 227 of the cylindrical support portion 222 contacts the outer surface of the small diameter portion, so that the support side surface 227 functions as the heat transfer surface of the present invention. Further, when the cask is supported by the gantry 220, the upper surface 228 of the cylindrical support portion 222 is not in contact with the lower surface of the trunk portion, so that a vertical gap is ensured. Function. Furthermore, the cylindrical support part 222 is formed with a fin 229 having a groove shape on the outer peripheral surface, and this fin 229 also functions as a heat radiating surface of the present invention. In this case, the fins 229 are formed by forming grooves along the vertical direction at equal intervals in the circumferential direction on the outer peripheral surface of the cylindrical support portion 222 having a cylindrical shape. The cooling side of the present invention is configured by the support side surface 227 as the heat transfer surface, the upper surface 228 as the heat dissipation surface, and the fins 229.

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

  For this reason, when the cask is supported by the gantry 220, the small diameter portion penetrates into the cylindrical support portion 222. At this time, the lower surface of the small diameter portion of the cask is supported by the support lower surface 226 of the gantry body 221, and the outer peripheral surface of the small diameter portion is supported by the support side surface 227 of the cylindrical support portion 222. The outer peripheral surface of the small-diameter portion is in contact with the support side surface 227, while a vertical gap is secured between the lower surface of the trunk portion and the upper surface 228 of the cylindrical support portion 222. Therefore, the heat of the cask is transmitted from the small diameter portion to the cylindrical support portion 222 of the gantry 220 through the support side surface 227 and is released to the atmosphere through the upper surface 228 and the fins 229.

  As described above, in the cask gantry of the fourth embodiment, the gantry body 221, the cylindrical support portion 222, and the heat insulating portion 223 are provided, and the heat transfer that is provided on the cylindrical support portion 222 and can contact the small diameter portion. A support side surface 227 as a surface and a cooling part having an upper surface 228 and a fin 229 as a heat dissipation surface that do not contact the small diameter portion are provided.

  Accordingly, the cask is supported by the small diameter portion penetrating into the cylindrical support portion 222, and heat transfer from the small diameter portion to the lower portion of the gantry body 221 is suppressed by the heat insulating portion 223, while the heat of the small diameter portion is supported by the support side surface 227. Then, the cask is uniformly cooled in the circumferential direction by being transmitted from the upper surface 228 and the fins 229 to the outside, and can be efficiently cooled over a long period of time.

  In this case, by forming the groove-shaped fin 229 on the outer peripheral surface of the cylindrical support portion 222, the cylindrical support portion 222 has a large heat radiation area in contact with the atmosphere, and the fin 229 efficiently radiates heat to the atmosphere. can do. And the fin 229 can be formed only by processing a groove | channel on the outer peripheral surface of the cylindrical support part 222, workability can be improved, and processing cost can be reduced.

  FIG. 14 is a perspective view of a cask gantry as a radioactive substance storage container gantry according to a fifth embodiment of the present invention. 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 fifth embodiment, as illustrated in FIG. 14, the gantry 230 includes a gantry body 231, a cylindrical support portion 232, and a heat insulating portion 233. The gantry body 231 has a plurality of legs 234 fixed to its lower surface. Further, the gantry body 231 is integrally provided with a cylindrical support portion 232 on the upper surface portion, and the cylindrical support portion 232 is capable of penetrating a small diameter portion of the cask inside. Further, the gantry body 231 has a recess 235 formed inside the cylindrical support portion 232, and a heat insulating material is filled in the recess 235 to form a heat insulating portion 233.

  The gantry 230 is provided between the cylindrical support portion 232 and the heat insulating portion 233 and has a ring-shaped support lower surface 236 capable of supporting the lower surface of the small diameter portion, and the cylindrical support portion 232 is provided inside the small diameter portion. A support side surface 237 having a ring shape capable of supporting the outer surface is provided.

  In this embodiment, when the cask is supported by the gantry 230, the support side surface 237 of the cylindrical support portion 232 contacts the outer surface of the small diameter portion, so that the support side surface 237 functions as the heat transfer surface of the present invention. Further, when the cask is supported by the gantry 230, the upper surface 238 of the cylindrical support portion 232 is not in contact with the lower surface of the trunk portion, so that a vertical gap is ensured. Function. And the cooling part of this invention is comprised by the support side 237 as this heat-transfer surface, and the upper surface 238 as a thermal radiation surface.

  Further, the gantry 230 is provided with a cooling device (cooling unit) 239 for cooling the gantry body 231 (or the cylindrical support portion 232). The cooling devices 239 are arranged at four corners on the upper surface of the gantry body 231 and can cool the gantry body 231 (or the cylindrical support portion 232). Further, the cooling device 239 may be disposed at one corner of the gantry body 231. As the cooling device 239, for example, a cooling fan, a cooling pipe, a heat pipe, a thermoelectric element (such as a Peltier element), or the like may be applied.

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

  For this reason, when the cask is supported by the gantry 230, the small diameter portion penetrates into the cylindrical support portion 232. At this time, the lower surface of the small diameter portion of the cask is supported by the support lower surface 236 of the gantry body 231, and the outer peripheral surface of the small diameter portion is supported by the support side surface 237 of the cylindrical support portion 232. The outer peripheral surface of the small diameter portion is in contact with the support side surface 237, while a vertical gap is secured between the lower surface of the trunk portion and the upper surface 238 of the cylindrical support portion 232. Therefore, the heat of the cask is transmitted from the small diameter portion to the cylindrical support portion 232 of the gantry 230 via the support side surface 237 and is released from the upper surface 238 to the atmosphere. At this time, by operating the cooling device 239, the gantry body 231 (or the cylindrical support portion 232) is forcibly cooled.

  As described above, in the cask gantry of the fifth embodiment, the gantry body 231, the cylindrical support portion 232, and the heat insulating portion 233 are provided, and the heat transfer that is provided on the cylindrical support portion 232 and can contact the small diameter portion. A support side surface 237 as a surface, an upper surface 238 as a heat dissipation surface that does not contact the small diameter portion, and a cooling unit having a cooling device 239 for cooling the gantry body 231 or the cylindrical support unit 232 are provided.

  Therefore, the cask is supported by the small diameter portion penetrating into the cylindrical support portion 232, and heat transfer from the small diameter portion to the lower portion of the gantry body 231 is suppressed by the heat insulating portion 233, while the heat of the small diameter portion is supported by the support side surface 237. From the upper surface 238 to the outside, and the chiller 239 cools the gantry body 231 and the cylindrical support portion 232 so that the cask is uniformly cooled in the circumferential direction. Thus, this cask can be efficiently cooled over a long period of time.

  FIG. 15 is a schematic view illustrating a cask support structure by a cask gantry as a radioactive material storage container gantry according to a sixth embodiment of the present invention. 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 sixth embodiment, as illustrated in FIG. 15, the gantry 240 includes a plurality of gantry main bodies 241, a cylindrical support portion 242, and a heat insulating portion 243. The gantry body 241 has a plurality of leg portions 244 fixed to the lower surface thereof, and a plurality (two in the present embodiment) are arranged one above the other. The upper frame main body 241 is integrally provided with a cylindrical support portion 242 on the upper surface portion, and the small diameter portion 12a of the cask 11 can penetrate inside the cylindrical support portion 242. Further, the gantry body 241 has a recess 245 formed inside the cylindrical support 242, and a heat insulating material is filled in the recess 245 to form a heat insulating part 243.

  The gantry 240 is provided between the cylindrical support portion 242 and the heat insulating portion 243 and has a ring-shaped support lower surface 246 that can support the lower surface of the small diameter portion, and the cylindrical support portion 242 is provided inside the small diameter portion. A support side surface 247 having a ring shape capable of supporting the outer surface is provided.

  In the present embodiment, when the cask 11 is supported by the mount 240, the support side surface 247 of the cylindrical support portion 242 contacts the outer surface of the small diameter portion, and thus the support side surface 247 functions as the heat transfer surface of the present invention. . Further, when the cask 11 is supported by the mount 240, the upper surface 248 of the cylindrical support portion 242 is not in contact with the lower surface of the body portion 12, so that a vertical gap is secured. Functions as a surface. And the cooling part of this invention is comprised by the support side surface 247 as this heat-transfer surface, and the upper surface 248 as a thermal radiation surface.

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

  Therefore, when the cask 11 is supported by the gantry 240, the small diameter portion 12a penetrates inside the cylindrical support portion 242. At this time, in the cask 11, the lower surface of the small diameter portion 12a is supported by the support lower surface 246 of the gantry body 241, and the outer peripheral surface of the small diameter portion 12a is supported by the support side surface 247 of the cylindrical support portion 242. And while the outer peripheral surface of the small diameter part 12a contacts the support side surface 247, a vertical gap is secured between the lower surface of the body part 12 and the upper surface 248 of the cylindrical support part 242. Therefore, the heat of the cask 11 is transmitted from the small diameter portion 12a to the cylindrical support portion 242 of the gantry 240 via the support side surface 247 and is released to the atmosphere from the upper surface 248 and the outer peripheral surface.

  Further, the cylindrical support portion 242 that supports the small diameter portion 12 a of the cask 11 is installed on the installation floor 102 via the two gantry main bodies 241. Therefore, the two gantry main bodies 241 function as a heat radiating portion, and the heat of the cask 11 is transmitted from the small diameter portion 12a to the cylindrical support portion 242 of the gantry 240 through the support side surface 247, and the two gantry main bodies 241 are provided. From the atmosphere.

  As described above, in the cask gantry of the sixth embodiment, the gantry main body 241, the cylindrical support portion 242 and the heat insulating portion 243 are provided, and a plurality of the gantry main bodies 241 are stacked in a vertical direction so as to support the cylindrical shape. There is provided a cooling part that is provided on the part 242 and has a support side surface 247 as a heat transfer surface that can come into contact with the small diameter part 12a and an upper surface 248 as a heat radiation surface that does not come into contact with the small diameter part 12a.

  Accordingly, the cask 11 is supported by the small-diameter portion 12a penetrating into the cylindrical support portion 242, and heat transfer from the small-diameter portion 12a to the lower portion of the gantry body 241 is suppressed by the heat insulating portion 243, while the heat of the small-diameter portion 12a is suppressed. Is transmitted from the support side surface 247 to the cylindrical support portion 242 and discharged from the upper surface 248 to the outside, so that the cask 11 is uniformly cooled in the circumferential direction, and the cask 11 can be efficiently cooled over a long period of time. Can do.

  In addition, two gantry main bodies 241 are stacked one above the other, and a cylindrical support portion 242 is provided on the upper gantry main body 241. The heat radiation area is expanded by the two gantry main bodies 241 to efficiently cool the cask 11. Can do.

  FIG. 16 is a schematic diagram illustrating a cask support structure by a cask gantry as a radioactive material storage container gantry according to a seventh embodiment of the present invention. 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 seventh embodiment, as illustrated in FIG. 16, the gantry 250 includes a plurality of gantry main bodies 251, a cylindrical support portion 252, and a heat insulating portion 253. The gantry body 251 has leg portions 254 fixed to the four corners (end portions) of the lower surface, respectively, and has a width larger than the diameter of the cask 11. The gantry body 251 is integrally provided with a cylindrical support portion 252 on the upper surface portion, and the small diameter portion 12a of the cask 11 can be penetrated into the cylindrical support portion 252 inside. Further, the gantry body 251 has a concave portion 255 formed inside the cylindrical support portion 252, and a heat insulating material is filled in the concave portion 255 to form a heat insulating portion 253.

  The gantry 250 is provided between the cylindrical support portion 252 and the heat insulating portion 253 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 252. It has the support side surface 257 which makes | forms the ring shape which can support the outer surface of 12a.

  In this embodiment, when the cask 11 is supported by the gantry 250, the support side surface 257 of the cylindrical support portion 252 contacts the outer surface of the small diameter portion 12a, so that the support side surface 257 functions as the heat transfer surface of the present invention. To do. Further, when the cask 11 is supported by the mount 250, the upper surface 258 of the cylindrical support portion 252 is not in contact with the lower surface of the body portion 12, so that a vertical gap is ensured. Functions as a surface. And the cooling part of this invention is comprised by the support side surface 257 as this heat-transfer surface, and the upper surface 258 as a thermal radiation surface.

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

  Therefore, when the cask 11 is supported by the gantry 250, the small diameter portion 12 a penetrates inside the cylindrical support portion 252. At this time, in the cask 11, the lower surface of the small diameter portion 12a is supported by the support lower surface 256 of the gantry body 251 and the outer peripheral surface of the small diameter portion 12a is supported by the support side surface 257 of the cylindrical support portion 252. And while the outer peripheral surface of the small diameter part 12a contacts the support side surface 257, a vertical gap is secured between the lower surface of the body part 12 and the upper surface 258 of the cylindrical support part 252. Therefore, the heat of the cask 11 is transmitted from the small diameter portion 12a to the cylindrical support portion 252 of the gantry 250 via the support side surface 257, and is released to the atmosphere from the upper surface 258 and the outer peripheral surface.

  The cylindrical support portion 252 that supports the small-diameter portion 12a of the cask 11 is fixed to the wide gantry body 251 and is installed on the installation floor 102 by four leg portions 254 at four corners. Therefore, the wide gantry body 251 functions as a heat radiating part, and the heat of the cask 11 is transmitted from the small diameter part 12a to the cylindrical support part 252 of the gantry 250 via the support side surface 257 and released from the gantry body 251 to the atmosphere. Is done.

  As described above, in the cask gantry of the seventh embodiment, the gantry main body 251, the cylindrical support portion 252, and the heat insulating portion 253 are provided, and the wide gantry main body 251 is disposed and provided on the cylindrical support portion 252. In addition, a cooling portion having a support side surface 257 as a heat transfer surface that can come into contact with the small diameter portion 12a and an upper surface 258 as a heat dissipation surface that does not come into contact with the small diameter portion 12a is provided.

  Accordingly, the cask 11 is supported by the small-diameter portion 12a penetrating into the cylindrical support portion 252, and heat transfer from the small-diameter portion 12a to the lower portion of the gantry body 251 is suppressed by the heat insulating portion 253, while the heat of the small-diameter portion 12a is suppressed. Is transmitted from the support side surface 257 to the cylindrical support portion 252 and discharged from the upper surface 258 to the outside, whereby the cask 11 is uniformly cooled in the circumferential direction, and the cask 11 can be efficiently cooled over a long period of time. Can do.

  The wide gantry body 251 is provided on the installation floor 102 with legs 254 at the four corners of the lower surface, and the cask 11 is supported by providing the cylindrical support 252 at the upper part. And the cask 11 can be efficiently cooled, and a large space A can be secured between the gantry body 251 and the installation floor 102, and the cooling function of the cask 11 can be improved.

  FIG. 17 is a cross-sectional view illustrating a cask mount as a mount for a radioactive substance storage container according to an eighth embodiment of the present invention. 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 eighth embodiment, as shown in FIG. 17, the cask 11 is supported on a pedestal 260 fixed to the installation floor 102. The gantry 260 can support the cask 11 stably by supporting the body 12 and the small diameter portion 12a of the cask 11. The cask 11 is a structure supported by the gantry 260.

  That is, the gantry 260 includes a gantry body 261, a cylindrical support portion 262, and a heat insulating portion 263. The gantry body 261 has a rectangular shape having a predetermined height, and a plurality of leg portions 264 are fixed to the lower surface. The leg portions 264 are installed by being in close contact with the installation floor 102, and the gantry body A space A is secured between the H.261 and the installation floor 102.

  The gantry body 261 is integrally provided with a cylindrical support 262 on the upper surface. The cylindrical support portion 262 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 261 is formed with a through hole 265 penetrating in the vertical direction inside the cylindrical support portion 262. The gantry 260 is provided between the cylindrical support portion 262 and the through-hole 265 so as to support the lower surface of the small diameter portion 12a. The support lower surface 266 has a ring shape, and the small diameter portion is provided inside the cylindrical support portion 262. It has a support side surface 267 having a ring shape capable of supporting the outer surface of 12a.

  Further, the through hole 265 is formed at the upper end portion inside the support lower surface 266 and a stepped portion 265a is formed, and the heat shielding member that constitutes the heat insulating portion 263 so as to close the through hole 265 in the stepped portion 265a. Is arranged. In this case, the upper surface portion of the heat insulating portion (heat shielding member) 263 is positioned below the support lower surface 266, and when the cask 11 is installed on the gantry body 261 and the lower surface is supported by the support lower surface 266, the cask 11 And a heat insulating part (heat shielding member) 263 are secured. And by providing this clearance gap, the heat conduction from the cask 11 to the heat insulation part (heat shielding member) 263 can be prevented, and the temperature rise below the gantry 260 can be prevented.

  By the way, the gantry 260 of the present embodiment is formed by casting. The cradle 260 can be manufactured by removing the mold after the molten material is put into a mold that is not shown and divided into upper and lower parts and cooled. However, after casting the gantry 260, at least the support lower surface 266 and the leg portion 264 need to be cut. By forming the gantry 260 by casting, machining such as cutting can be reduced, and the manufacturing cost can be reduced. In addition, since the surface of the gantry 260 becomes a cast skin, the heat dissipation area can be increased, so that the heat dissipation efficiency can be improved.

  In this embodiment, when the cask 11 is supported by the gantry 260, the support side surface 267 of the cylindrical support portion 262 contacts the outer surface of the small diameter portion 12a, so that the support side surface 267 functions as the heat transfer surface of the present invention. To do. Further, when the cask 11 is supported by the gantry 260, the upper surface 268 of the cylindrical support portion 262 is not in contact with the lower surface of the trunk portion 12, and the vertical gap S is secured. It functions as a heat dissipation surface. Further, since the outer peripheral surface 269 is not in contact with the cask 11, the outer peripheral surface 269 also functions as a heat radiating surface of the present invention. The cooling side of the present invention is configured by the support side surface 267 as the heat transfer surface, the upper surface 268 as the heat dissipation surface, and the outer peripheral surface 269.

  Therefore, when the cask 11 is supported by the mount 260, the small diameter portion 12a penetrates inside the cylindrical support portion 262. At this time, in the cask 11, the outer side of the lower surface of the small diameter portion 12a is supported by the support lower surface 266 of the gantry body 261, and the outer peripheral surface of the small diameter portion 12a is supported by the support side surface 267 of the cylindrical support portion 262. And while the outer peripheral surface of the small diameter part 12a contacts the support side surface 267, the vertical direction clearance S is ensured between the lower surface of the trunk | drum 12, and the upper surface 268 of the cylindrical support part 262. Therefore, the heat of the cask 11 is transmitted from the small diameter portion 12 a to the cylindrical support portion 262 of the gantry 260 via the support side surface 267 and is released to the atmosphere via the upper surface 268 and the outer peripheral surface 269. In addition, since the gantry 260 is provided with a heat insulating portion (heat shielding member) 263 at the center portion, the radiant heat from the cask 11 is reduced, and the temperature of the installation floor 102 is prevented from being increased.

  As described above, in the cask gantry of the eighth embodiment, the through hole 265 extending in the vertical direction is provided inside the cylindrical support portion 262 of the gantry main body 261, and the heat insulating portion (heat Shield member) 263 is provided.

  Therefore, by providing the through hole 265 inside the cylindrical support portion 262 in the gantry body 261, the amount of material that uses unnecessary portions as space can be reduced, and the cost can be reduced. Further, by closing the through hole 265 with the heat insulating portion (heat shielding member) 263, it is possible to reduce the radiant heat from the cask 11 downward and to prevent the installation floor 102 from being heated to a high temperature.

  In the cask mount of Example 8, a stepped portion 265a is provided in the through hole 265, and a heat insulating portion (heat shielding member) 263 is disposed in the stepped portion 265a. Therefore, the heat transmitted from the gantry 260 to the floor can be efficiently reduced.

  Moreover, in the cask gantry of the eighth embodiment, the gantry 260 is formed by casting. Therefore, it is possible to reduce the manufacturing cost by reducing machining such as cutting.

  FIG. 18 is a cross-sectional view illustrating a cask mount as a mount for a radioactive substance storage container according to Embodiment 9 of the present invention. 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 ninth embodiment, as illustrated in FIG. 18, the gantry 270 includes a gantry body 271, a cylindrical support portion 272, and a heat insulating portion 273. The gantry body 271 has a plurality of legs 274 fixed to the lower surface. Further, the gantry body 271 is integrally provided with a cylindrical support portion 272 on the upper surface portion, and the small diameter portion 12a of the cask 11 can be penetrated into the cylindrical support portion 272 on the inner side. Further, the gantry body 271 has a through hole 275 formed inside the cylindrical support portion 272, and a heat insulating portion (heat shielding member) 273 is disposed in a stepped portion 275 a in the through hole 275.

  The gantry 270 is provided between the cylindrical support portion 272 and the heat insulating portion 273 so as to support the lower surface of the small diameter portion 12a. The support lower surface 276 has a ring shape, and the small diameter portion is provided inside the cylindrical support portion 272. It has a support side surface 277 having a ring shape capable of supporting the outer surface.

  In the present embodiment, when the cask 11 is supported by the mount 270, the support side surface 277 of the cylindrical support portion 272 contacts the outer surface of the small diameter portion 12a. Therefore, the support side surface 277 functions as the heat transfer surface of the present invention. To do. Further, when the cask 11 is supported by the mount 270, the upper surface 278 of the cylindrical support portion 272 is not in contact with the lower surface of the trunk portion 12, and the vertical gap S is secured. Functions as a heat dissipation surface. Further, the cylindrical support portion 272 is formed with fins 279 having a plate shape along the circumferential direction on the outer peripheral surface, and the fins 279 also function as heat dissipation surfaces of the present invention. In this case, the fin 279 has a ring shape, and a plurality (three in this embodiment) are provided with a predetermined gap in the vertical direction. However, the fins 279 are not limited to a ring shape continuous in the circumferential direction, and may be provided with notches or a plurality of intermittently. And the cooling part of this invention is comprised by the support side 277 as this heat-transfer surface, the upper surface 278 as a heat-radiation surface, and the fin 279. FIG.

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

  Therefore, when the cask 11 is supported by the gantry 270, the small diameter portion 12 a penetrates inside the cylindrical support portion 272. At this time, in the cask 11, the lower surface of the small diameter portion 12a is supported by the support lower surface 276 of the gantry body 271 and the outer peripheral surface of the small diameter portion 12a is supported by the support side surface 277 of the cylindrical support portion 272. And while the outer peripheral surface of the small diameter part 12a contacts the support side surface 277, the vertical direction clearance S is ensured between the lower surface of the trunk | drum 12, and the upper surface 278 of the cylindrical support part 272. Therefore, the heat of the cask 11 is transmitted from the small diameter portion 12 a to the cylindrical support portion 272 of the mount 270 via the support side surface 277, and is released to the atmosphere via the upper surface 278 and the fins 279.

  As described above, in the cask gantry of the ninth embodiment, the gantry body 271, the cylindrical support portion 272, and the heat insulating portion 273 are provided, and the transmission that is provided on the cylindrical support portion 272 and can contact the small diameter portion 12 a. A support side surface 277 as a hot surface and a cooling portion having an upper surface 278 and a fin 279 as a heat radiating surface that do not contact the small diameter portion 12a are provided.

  Accordingly, the cask 11 is supported by the small diameter portion 12a penetrating into the cylindrical support portion 272, and heat transfer from the small diameter portion 12a to the lower portion of the gantry body 271 is suppressed by the heat insulating portion 273, while the heat of the small diameter portion 12a is suppressed. Is transmitted from the support side surface 277 to the cylindrical support portion 272 and discharged from the upper surface 278 and the fins 279 to the outside, so that the cask 11 is uniformly cooled in the circumferential direction. Can be cooled.

  In this case, by forming fins 279 along the circumferential direction on the outer peripheral surface of the cylindrical support portion 272, the cylindrical support portion 272 has a large heat dissipation area in contact with the atmosphere, and heat is efficiently radiated from the fins 279 to the atmosphere. can do. Further, since the fins 279 are arranged along the circumferential direction, the cooling flow flowing in the horizontal direction is not obstructed by a part of the fins 279, and can easily flow to the fins 279 around the entire circumference of the cylindrical support portion 272. It can cool well.

11 Cask (radioactive substance storage container)
12 body portion 12a small diameter portion 13 lid portion 50, 200, 210, 220, 230, 240, 250, 260, 270 frame 51, 201, 211, 211, 231, 241, 251, 261, 271 frame body 52, 202, 212,222,232,242,252,262,272 Tubular support 53,203,213,223,233,243,253,263,273 Thermal insulation 54,204,214,224,234,244,254 264, 274 Legs 56, 66, 76, 206, 216, 226, 236, 246, 256, 266, 276 Support lower surface 57, 67, 77, 207, 217, 227, 237, 247, 257, 267, 277 Side (heat transfer surface, cooling part)
58, 68, 78, 208, 218, 228, 238, 248, 258, 268, 278 Upper surface (heat radiation surface, cooling part)
59, 69, 79 Outer peripheral surface (heat radiation surface, cooling part)
209, 219, 229, 279 Fins (heat radiation surface, cooling part)
239 Cooling device (cooling part)
265,275 Through hole

Claims (13)

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 cooling portion provided on the cylindrical support portion and having a heat transfer surface that can contact the small diameter portion and a heat dissipation surface that does not contact the small diameter portion;
A stand for a radioactive substance storage container.   The radioactive heat according to claim 1, wherein the heat transfer surface is formed on an inner peripheral surface of the cylindrical support portion, and the heat dissipation surface is formed on an upper surface and an outer peripheral surface of the cylindrical support portion. Base for substance storage container.   3. The radioactive substance storage container pedestal according to claim 2, wherein the heat radiating surface has fins formed in a corrugated shape on an outer peripheral surface of the cylindrical support portion.   3. The radioactive substance storage container pedestal according to claim 2, wherein the heat radiating surface has a plurality of fins provided in a plate shape on an outer peripheral surface of the cylindrical support portion.   3. The radioactive substance storage container pedestal according to claim 2, wherein the heat radiating surface has a plurality of fins provided in a groove shape on an outer peripheral surface of the cylindrical support portion.   The radioactive substance storage container gantry according to any one of claims 1 to 5, wherein the cooling unit includes a cooling device that cools the gantry body or the cylindrical support unit.   The radioactive substance storage container gantry according to any one of claims 1 to 6, wherein a plurality of the gantry main bodies are vertically stacked.   The said gantry main body is set to the width | variety larger than the diameter of a radioactive substance storage container, and is installed in a floor surface by the leg part provided in each edge part, The Claim 1 characterized by the above-mentioned. For radioactive material storage containers.   The said gantry main body is provided with the through-hole which follows an up-down direction inside the said cylindrical support part, and the said heat insulation part is provided so that the said through-hole may be obstruct | occluded. The mount for radioactive substance storage containers as described in one.   The radioactive substance storage container pedestal according to claim 9, wherein the through hole is provided with a stepped portion, and the stepped portion is provided with a heat shielding member constituting the heat insulating portion.   3. The radioactive substance storage container pedestal according to claim 2, wherein the heat radiating surface includes fins formed along a circumferential direction on an outer peripheral surface of the cylindrical support portion.   12. The method for manufacturing a radioactive substance storage container stand according to claim 1, wherein the radioactive substance storage container stand is formed by casting.   A structure in which the radioactive substance storage container is supported by the radioactive substance storage container stand according to any one of claims 1 to 11.

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