JP2011058845A - Radioactive material storage container and method for mounting trunnion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve miniaturization and cost reduction of a trunnion in a radioactive material storage container and a method for fixing a trunnion. <P>SOLUTION: Sloping surfaces 53a, 53b, 53c, 53d, which have a linear shape in the circumferential direction on the outer circumference section of a seating section 51 and are widened to the mounting side in the axial direction, are formed by the trunnion 30. Reverse sloping surfaces 62a, 62b, 62c, 62d, which have a linear shape in the circumferential direction on the inner circumference section and are narrowed to the opening side, are formed by a mounting recess section 61. The seating section 51 is positioned on the mounting recess section 61 so that the sloping surfaces 53a, 53b, 53c, 53d face the reverse sloping surfaces 62a, 62b, 62c, 62d. A key 71 is inserted between the sloping surfaces 53a, 53b, 53c, 53d and the reverse sloping surfaces 62a, 62b, 62c, 62d. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radioactive substance storage container for storing and storing radioactive waste, and to a method for attaching a trunnion fixed to an outer peripheral portion for lifting the radioactive substance storage container.

  Radioactive waste generated at a nuclear power plant or the like is stored in a radioactive substance storage container, and transported to a storage or treatment facility for storage or processing.

  Such a radioactive substance storage container includes, for example, a trunk main body having an open top and a cylindrical shape, a lid fixed to the upper part of the trunk main body, and a plurality of suspensions fixed to the outer periphery of the trunk main body. And trunnion.

  Therefore, radioactive waste is stored in this radioactive substance storage container, transported to a storage or processing facility by a ship, a vehicle, or the like, and stored or processed 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.

  By the way, the trunnion mentioned above is being fixed to the outer peripheral part of the trunk | drum main body which comprises a radioactive substance storage container with a some volt | bolt. That is, the trunnion is formed by integrally forming a seat portion having a disk flange shape that is seated and fixed on the trunk body, and a latching portion having a columnar shape for coupling with the suspension. A plurality of mounting holes are formed in the outer periphery of the. On the other hand, a mounting recess for fitting the seating portion is formed on the outer peripheral portion of the trunk body, and a plurality of screw holes into which bolts are screwed are formed. Therefore, the trunnion is a state in which a plurality of (for example, 12) bolts pass through the respective mounting holes and are screwed into the screw holes and fastened in a state where the seating portion is fitted in the mounting recess of the trunk body. Fixed to the body.

  As one of the forms of such a radioactive substance storage container, as a cask for storing a spent fuel assembly, for example, there are those described in Patent Documents 1 and 2 below.

Japanese Patent Laid-Open No. 2001-133583 Japan Society of Opportunity Spent Fuel Storage Facility Standard Metal Cask Structure Standard (JSMES FA1-2007)

  However, in general, there are cases in which a total of four trunnions are fixed to the upper and lower portions of the radioactive substance storage container in order to enable vertical and horizontal suspension in one container. Then, as for the number of bolts used to fix the trunnion to the trunk body, if one trunnion is fastened with 12 bolts, 48 fastening bolts are required, which not only increases the part cost but also the work cost. Will also increase. In addition, in the vertical suspension, there are cases where four trunnions are arranged at the top, and in that case, the number of fastening holes formed in the trunk body is also required as the number of bolts increases along with the increase in trunnions. . The processing of the fastening holes requires a plurality of processing steps such as pilot hole processing (drill) and screw processing (tap), and the manufacturing cost increases with respect to the processing of a considerable number of fastening holes. Furthermore, it is necessary to form a mounting recess for seating the trunnion on the trunk body, but this trunk body is a shield, and forming the mounting recess leads to a shielding loss and provides sufficient shielding. In order to secure it, the structure of the cask becomes complicated.

  Further, it is conceivable that bolts and screw holes can be reduced by fixing the trunnion to the trunk body by welding. However, the trunnion may be damaged when transporting the radioactive substance storage container, and it is desirable that the trunnion be replaceable. In the radioactive substance storage container in which the trunnion is fixed to the trunk body by welding, the trunnion is replaced. There is a problem in maintainability.

  The present invention solves the above-described problems, and an object thereof is to provide a radioactive substance storage container and a trunnion fixing method capable of reducing the size of the trunnion and reducing the cost.

  In order to achieve the above object, a radioactive substance storage container according to the present invention includes a trunk main body for storing a radioactive substance, and a plurality of suspension trunnions whose seats are mounted in mounting recesses of the trunk main body. The trunnion has an outer peripheral portion of the seating portion that is linear in the circumferential direction and an inclined surface that extends to the mounting side in the axial direction of the trunnion, and the mounting recess has an inner peripheral portion that is linear in the circumferential direction. The trunnion is formed on the opening side, and the trunnion is inserted into the mounting recess so that the inclined surface faces the inclined surface, and an outer peripheral portion of the seating portion. And a key is fitted between the inner peripheral portion of the mounting recess and fixed to the trunk body.

  In the radioactive substance storage container of the present invention, the key is fitted between the inclined surface and the inclined surface.

  In the radioactive substance storage container of the present invention, the seat portion and the mounting recess have a polygonal shape in plan view, and the inclined surface and the inclined surface are an outer peripheral portion of the seat portion and an inner peripheral portion of the mounting recess. It is characterized by being formed on at least one side.

  In the radioactive substance storage container of the present invention, the inclined surface and the inclined surface are formed on all sides of the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess, and at least one piece of the inclined surface and the covered surface are provided. The key is fitted between the inclined surface, and the side where the key is not fitted between the inclined surface and the inclined surface is in contact with the inclined surface by the inclined surface and the inclined surface. It is fixed to the main body.

  In the radioactive substance storage container of the present invention, a curved portion is formed in an adjacent portion between the sides on the inner peripheral portion of the mounting recess.

  In the radioactive substance storage container of the present invention, the key is fixed between the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess by an interference fit.

  The trunnion fixing method of the present invention is a radioactive substance storage container comprising: a trunk body that stores a radioactive substance; and a plurality of lifting trunnions that have seating portions mounted in mounting recesses of the trunk body. The seating portion is inserted into the mounting recess of the trunk body, and a key is fitted between the outer periphery of the seating portion and the inner periphery of the mounting recess, so that the outer periphery of the seating portion is linear in the circumferential direction. The trunnion is formed by the action of an inclined surface that extends in the mounting direction in the axial direction and an inclined surface that has an inner peripheral portion of the mounting recess that is linear in the circumferential direction and that is narrowed toward the opening side. It is fixed to the trunk body. The trunk body can be applied to a cylindrical shape or a polygonal shape such as a square tube.

  According to the radioactive substance storage container of the present invention, the trunk body and the seating portion are provided with a plurality of suspension trunnions to be mounted in the mounting recesses of the trunk body, and the trunnion has an outer peripheral portion of the seating portion. An inclined surface that forms a straight line in the circumferential direction and extends on the mounting side in the axial direction is formed, and an inclined surface that has an inner peripheral part that forms a straight line in the circumferential direction and narrows on the opening side is formed in the mounting recess. The seat portion is inserted into the mounting recess so that the inclined surface faces the surface to be tilted, and a key is fitted between the outer peripheral portion of the seat portion and the inner peripheral portion of the mounting recess. Therefore, the seating portion of the trunnion is firmly fixed to the trunk main body by locking the inclined surface to the inclined surface of the mounting recess directly or via a key, eliminating the need for a large number of bolts. The trunnion can be reduced in size, and the component cost and manufacturing cost can be reduced.

  According to the radioactive substance storage container of the present invention, since the key is fitted between the inclined surface and the inclined surface, the inclined surface and the inclined surface are caused to act by the key, and the seating portion is removed from the mounting recess. Can be prevented.

  According to the radioactive substance storage container of the present invention, the seating portion and the mounting recess are polygonal, and the inclined surface and the inclined surface are formed on at least one side of the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess. The processability can be improved by forming the portion and the mounting recess into a polygonal shape and forming the inclined surface and the inclined surface on one side.

  According to the radioactive substance storage container of the present invention, the inclined surface and the inclined surface are formed on all sides of the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess, and at least one piece of the inclined surface and the inclined surface is formed. A key is inserted between the inclined surface and the inclined surface, and the inclined surface and the inclined surface are brought into contact with each other on the side where the key is not inserted between the inclined surface and the inclined surface. Since the key is fitted between the two, the cost of components can be reduced by reducing the number of keys.

  According to the radioactive substance storage container of the present invention, since the curved portion is formed in the adjacent portion between the sides at the inner peripheral portion of the mounting recess, the mounting recess and the inclined surface can be easily processed, and the workability is improved. be able to.

  According to the radioactive substance storage container of the present invention, the key is fixed between the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting concave portion by an interference fit, so that a fastening part for fixing the key is not necessary, The cost can be reduced and the structure can be simplified.

  According to the trunnion fixing method of the present invention, the seating portion of the trunnion is inserted into the mounting recess of the trunk body, and the key is fitted between the outer periphery of the seating portion and the inner periphery of the mounting recess. The trunnion is fixed to the trunk body by the action of the inclined surface of the portion and the inclined surface of the mounting recess. Therefore, the seating portion of the trunnion is firmly fixed to the trunk main body by locking the inclined surface to the inclined surface of the mounting recess directly or via a key, eliminating the need for a large number of bolts. Since the flange portion for fastening the bolts can be reduced, the trunnion can be reduced in size, and the component cost, the manufacturing cost, and the like can be reduced.

FIG. 1 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing a trunnion mounting portion in the cask of the first embodiment. 3 is a cross-sectional view taken along the line III-III in FIG. 1 showing a trunnion mounting portion in the cask of the first embodiment. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 showing a trunnion mounting portion in the cask of the first embodiment. FIG. 5A is a front view illustrating the trunnion. FIG. 5B is a side view illustrating the trunnion. FIG. 6A is a front view illustrating a mounting recess in the trunk body. FIG. 6B is a cross-sectional view illustrating the mounting recess in the trunk body. FIG. 7A is a front view illustrating the key. FIG. 7B is a side view illustrating the key. FIG. 8-1 is a schematic for explaining the trunnion fixing method according to the first embodiment. FIG. 8-2 is an explanatory diagram for explaining the trunnion fixing method according to the first embodiment. FIG. 8C is an explanatory diagram for explaining the trunnion fixing method according to the first embodiment. FIG. 8D is an explanatory diagram for explaining the trunnion fixing method according to the first embodiment. FIG. 9 is a partial cross-sectional schematic view of the cask of the first embodiment. FIG. 10 is a horizontal sectional view of the cask of the first embodiment. FIG. 11 is a schematic diagram illustrating a storage facility for storing the cask of the first embodiment. FIG. 12 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 2 of the present invention. FIG. 13 is a cross-sectional view illustrating a trunnion mounting portion in the cask of the second embodiment. FIG. 14 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 3 of the present invention. FIG. 15 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 4 of the present invention. FIG. 16 is a cross-sectional view illustrating a trunnion mounting portion in the cask of the fourth embodiment. FIG. 17 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 5 of the present invention. FIG. 18 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 6 of the present invention. FIG. 19 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 7 of the present invention. FIG. 20 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 8 of the present invention. FIG. 21 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 9 of the present invention. FIG. 22 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 10 of the present invention. FIG. 23 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 11 of the present invention. FIG. 24 is a cross-sectional view of a principal part showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 12 of the present invention. FIG. 25 is a cross-sectional view of a principal part illustrating a modification of the trunnion mounting portion in the cask of the twelfth embodiment. FIG. 26 is a cross-sectional view of a principal part illustrating a modification of the trunnion mounting portion in the cask of the twelfth embodiment. FIG. 27 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 13 of the present invention. FIG. 28 is a cross-sectional view illustrating a trunnion mounting portion in the cask of the second embodiment.

  Exemplary embodiments of a radioactive substance storage container and a trunnion fixing method 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.

  FIG. 1 is a front view illustrating a trunnion mounting portion in a cask that stores a spent fuel assembly as a radioactive substance storage container according to a first embodiment of the present invention, and FIG. 2 illustrates a trunnion mounting portion in the cask of the first embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line III-III in the cask of the first embodiment. IV-IV sectional view, FIG. 5-1 is a front view showing the trunnion, FIG. 5-2 is a side view showing the trunnion, FIG. 6-1 is a front view showing the mounting recess in the trunk body, FIG. 2 is a sectional view showing a mounting recess in the trunk body, FIG. 7-1 is a front view showing a key, FIG. 7-2 is a side view showing the key, and FIG. 8-1 is a fixing of the trunnion of the first embodiment. FIG. 8-2 is an explanatory diagram for explaining the method, and FIG. FIG. 8-3 is an explanatory diagram for explaining the trunnion fixing method according to the first embodiment, and FIG. 8-4 is an explanatory diagram for explaining the trunnion fixing method according to the first embodiment. FIG. 9 is a partial sectional schematic view of the cask of the first embodiment, FIG. 10 is a horizontal sectional view of the cask of the first embodiment, and FIG. 11 is a diagram for storing the cask of the first embodiment. It is the schematic showing a storage facility.

  First, the cask as the radioactive substance storage container of Example 1 will be described in detail with reference to FIGS. 9 and 10. As shown in FIGS. 9 and 10, in the cask 11, the trunk body 12 has a cylindrical shape, and the inner surface of the cavity 13 provided inside is machined according to the outer peripheral shape of the basket 14. A bottom portion 15 is joined to the lower portion of the trunk body 12 by welding. The trunk body 12 and the bottom portion 15 are forged products made of carbon steel having a γ-ray shielding function, but stainless steel is used instead of carbon steel. Steel can also be used. Also, cast products such as spheroidal graphite cast iron and carbon steel cast steel can be used.

  An outer cylinder 16 is disposed on the outer peripheral side of the trunk body 12 with a predetermined gap therebetween. Between the outer circumferential surface of the trunk body 12 and the inner circumferential surface of the outer cylinder 16, a copper conductor that conducts heat is provided. A plurality of heat transfer fins 17 are welded in the circumferential direction. A resin (neutron shielding body) 18 containing a boron or a boron compound, which is a polymer material containing a large amount of hydrogen in the space between the trunk body 12 and the outer cylinder 16 and has a neutron shielding function, is not shown in a flow state. It is injected and solidified through a pipe or the like. In this case, it is preferable that the heat transfer fins 17 be provided at a high density in a portion having a large amount of heat in order to uniformly dissipate heat. In addition, a bottom plate 20 is connected to a lower side of the bottom portion 15 with a plurality of connecting plates 19 with a predetermined gap, and a resin (neutron shield) 21 is provided in a space portion between the bottom portion 15 and the bottom plate 20. ing.

  A lid portion 22 that closes the upper opening of the trunk body 12 includes a primary lid 23 and a secondary lid 24. The primary lid 23 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid 24 also has a disk shape made of stainless steel or carbon steel, and a resin (neutron shield) 25 is sealed on the upper surface thereof. The primary lid 23 and the secondary lid 24 are attached to the upper end portion of the trunk body 12 by bolts 26 made of stainless steel or carbon steel. In this case, metal gaskets (not shown) are interposed between the primary lid 23 and the secondary lid 24 and the trunk body 12 to ensure the internal sealing performance. In addition, an auxiliary shield 28 enclosing the resin 27 is provided around the lid portion 22.

  The basket 14 provided inside the cask 11 is composed of a plurality of square pipes constituting a cell 29 for storing a spent fuel assembly. The 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.

  A plurality of trunnions 30 for lifting the cask 11 are provided on both sides of the outer peripheral surface at the upper and lower portions of the trunk body 12. The cask 11 accommodates the spent fuel assembly therein and then is transported to the storage facility. When the cask 11 is transported, the auxiliary shield 28 attached to the upper end of the trunk body 12 is removed and the cask 11 is removed. A shock absorber (not shown) is attached to the upper end and the lower end of the. 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. Further, after the cask 11 is carried into the storage facility, the buffer body is removed and stored in an upright state using the mounting table 31.

  That is, as shown in FIG. 11, the storage facility 41 is entirely constituted by a concrete wall, and has an installation floor 42, a ceiling wall 43, and a plurality of side walls 44. A ventilation tower 46 in which a large number of air inlets 45 are formed is provided on both sides of the installation floor 42. In the storage facility 41, a large number of casks 11 are arranged on the installation floor 42 at a predetermined interval. Each cask 11 stores a spent fuel assembly as described above. Further, a loading pit 48 having a loading gate 47 is provided on one side of the storage facility 41, and the cask 11 is loaded into the storage facility 41 from the loading pit 48 by a transport vehicle. A cask transfer crane 49 is movably provided above the storage facility 41, and the cask 11 carried into the carry-in pit 48 is transferred by the cask transfer crane 49 and arranged at a predetermined position. .

  In the cask 11 configured in this way, as described above, the trunnion 30 for lifting the cask 11 at a predetermined position is fixed to the outer peripheral portion of the trunk body 12. In the first embodiment, the trunnion 30 is fixed to the trunk body 12 by using a key to be described later without using a bolt.

  That is, as shown in FIGS. 5A and 5B, the trunnion 30 locks the seat portion 51 having a flange shape that is seated and fixed on the trunk body 12 and the wire, rope, alloy, and the like. And a latching portion 52 having a cylindrical shape is integrally formed. The seating portion 51 has a polygonal shape (in this embodiment, a quadrangle) in a plan view, and is set to a predetermined thickness t. The latching portion 52 has a large diameter portion 52a having a smaller diameter than the seating portion 51 and a medium diameter portion 52b having a smaller diameter than the large diameter portion 52a and a medium diameter. A small diameter portion 52c having a diameter smaller than that of the medium diameter portion 52b and a flange portion 52d having a diameter larger than that of the small diameter portion 52c are formed continuously with the portion 52b.

  And in this trunnion 30, the seating part 51 has a flat bottom surface 51a, is linear in the outer circumferential part in the circumferential direction, and is attached to the mounting recess 61 of the trunk body 12 in the axial direction (FIGS. 6-1, 6). 2), inclined surfaces 53a, 53b, 53c, and 53d are formed. That is, since the seating portion 51 has a rectangular flat plate shape, it has four sides, and inclined surfaces 53a, 53b, 53c, and 53d are formed on each side. The inclined surfaces 53a, 53b, 53c, and 53d have a so-called tenon shape in which the seat portion 51 becomes narrower toward the latching portion 52 side (upper side in FIG. 5-2). In this case, the seating portion 51 has a square shape in plan view, and inclined surfaces 53a, 53b, 53c, and 53d are formed on each side of the outer peripheral portion. Therefore, when the width on the latching portion 52 side is set to w1 and the width on the bottom surface 51a side is set to w2, w1 <w2.

  On the other hand, as shown in FIGS. 6A and 6B, a mounting recess 61 in which the seat 51 of the trunnion 30 is mounted is formed at a predetermined position in the trunk body 12. The mounting recess 61 has a polygonal shape (in the present embodiment, a quadrangle) in plan view, and is set to a predetermined depth d.

  The mounting recess 61 has a flat bottom surface 61a, and is formed with inclined surfaces 62a, 62b, 62c, and 62d that form a straight line in the circumferential direction and narrow toward the opening side. That is, since the mounting recess 61 has a quadrangular shape, it has four sides, and inclined surfaces 62a, 62b, 62c, and 62d are formed on each side. The inclined surfaces 62a, 62b, 62c, and 62d have a so-called dovetail shape that becomes narrower toward the opening side (upper side in FIG. 6-2). In this case, the mounting recess 61 has a square shape in plan view, and inclined surfaces 62a, 62b, 62c, and 62d are formed on each side of the outer peripheral portion. Therefore, when the width on the opening side is set to w3 and the width on the bottom surface 61a side is set to w4, w3 <w4 is satisfied.

  In this case, the depth d of the mounting recess 61 and the thickness t of the seating portion 51 are set to substantially the same numerical value. Further, the width w2 of the seating portion 51 is smaller than the width w3 of the mounting recess 61 and is set to w2 <w3. Furthermore, the shape of each inclined surface 53a, 53b, 53c, 53d formed in the seating portion 51 and the shape of each inclined surface 62a, 62b, 62c, 62d formed in the mounting recess 61 are set to the same shape. Therefore, the inclination angles with respect to the bottom surfaces 51a and 61a are set to the same angle in both the parts.

  As shown in FIGS. 7A and 7B, four keys 71 are provided to fix the seating portion 51 of the trunnion 30 to the mounting recess 61 of the trunk body 12. Each of the keys 71 has a bar shape with a parallelogram in cross section and has the same shape. The key 71 is an inclined surface in which the left and right side surfaces 72c and 72d are parallel to the parallel upper surface 72a and lower surface 72b. In the key 71, the width of the upper surface 72a and the lower surface 72b is set to w5.

In this case, the widths w1 and w2 of the seating portion 51 in the trunnion 30, the widths w3 and w4 of the mounting recess 61 in the trunk body 12, and the width w5 of the key 71 are set as follows.
w1 + w5 × 2 = w3
w2 + w5 × 2 = w4
However, as will be described later, the trunnion 30, the trunk body 12, and the key 71 slightly vary due to expansion and contraction due to temperature.

  Here, a method for fixing the trunnion 30 configured as described above to the mounting recess 61 of the trunk body 12 using the key 71 will be described.

  First, as shown in FIG. 8-1, the trunnion 30 is lifted and transferred by a crane or the like (not shown), and the seat 51 of the trunnion 30 is inserted into the mounting recess 61 of the trunk body 12 as shown in FIG. To do. At this time, the trunnion 30 is placed so that the seating portion 51 is positioned at the center of the mounting recess 61. Thereby, the inclined surfaces 53a, 53b, 53c, and 53d of the seating portion 51 and the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 61 face each other, and a predetermined gap is secured between them. Next, as shown in FIG. 8-3, four keys 71 are transferred by a crane, and as shown in FIG. 8-4, each key 71 is moved to the inclined surfaces 53a, 53b, It fits in the clearance gap between 53c, 53d and the inclined surfaces 62a, 62b, 62c, 62d of the mounting recess 61. Thereby, the seating portion 51 of the trunnion 30 is fixed to the mounting recess 61 of the trunk body 12.

  In this case, each key 71 is placed in the gap between the inclined surfaces 53a, 53b, 53c, 53d of the seating portion 51 in the trunnion 30 and the inclined surfaces 62a, 62b, 62c, 62d of the mounting recess 61 in the trunk body 12. This key 71 is fixed by driving. Each key 71 may be fixed to the seat 51 of the trunnion 30 and the mounting recess 61 of the trunk body 12 by an interference fit. That is, the key 71 is contracted by cooling to a predetermined temperature or lower, and in this state, the inclined surfaces 53a, 53b, 53c, 53d of the seating portion 51 and the inclined surfaces 62a, 62b, You may use the cold fit inserted in the clearance gap between 62c and 62d. Further, the periphery of the mounting recess 61 in the trunk body 12 is expanded by heating, and in this state, the inclined surfaces 53a, 53b, 53c, 53d of the seating portion 51 and the inclined surfaces 62a, 62b of the mounting recess 61 are obtained. , 62c, and 62d may be used in a shrink fit.

When the key is fixed using this cold fit or shrink fit, the widths w1 and w2 of the seating portion 51 in the trunnion 30, the widths w3 and w4 of the mounting recess 61 in the trunk body 12, and the width of the key 71 in advance. The cooling process of the key 71 and the heating process of the trunk body 12 are performed so that the relationship with w5 is as follows.
w1 + w5 × 2 <w3
w2 + w5 × 2 <w4
Then, after the key 71 is mounted, the key 71 expands and the trunk body 12 contracts due to the cold fit and shrink fit, whereby the key 71 is fixed.

  When the trunnion 30 is fixed to the trunk body 12 in this way, as shown in FIGS. 1 to 3, the seating portion 51 is placed at the center of the mounting recess 61 at the normal temperature, and the inclined surface 53 a of the seating portion 51. , 53b, 53c, and 53d and the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 61, the key 71 is respectively fitted. That is, the inclined surface 53a of the seating portion 51 and the inclined surface 62a of the mounting recess 61 are opposed to each other. The side surface 72c of the key 71 is in contact with the inclined surface 53a of the seating portion 51, and the side surface 72d is inclined to the mounting recess 61. It will be in the state contact | abutted to the surface 62a. The relationship between the inclined surfaces 53b, 53c, 53d of the other seating portions 51 and the inclined surfaces 62b, 62c, 62d of the mounting recess 61 is the same. Therefore, the trunnion 30 is prevented from coming off by the seating portion 51 being locked to the mounting recess 61 by the respective keys 71 and is firmly fixed to the trunk body 12.

  In the first embodiment, the four keys 71 have the same shape but have two lengths. That is, as shown in FIG. 1, the length of the key 71 between the inclined surfaces 53a, 53c of the seating portion 51 and the inclined surfaces 62a, 62c of the mounting recess 61 is equal to or slightly equal to the width w3 of the mounting recess 61. A value obtained by subtracting the key width W5 from the width w3 of the mounting recess 61, and the length of the key 71 between the inclined surfaces 53b, 53d of the seating portion 51 and the inclined surfaces 62b, 62d of the mounting recess 61 is set short. Is set to the same or slightly shorter.

  In this case, as shown in FIG. 4, the end surface of the short key 71 entering between the inclined surfaces 53 b and 53 d of the seating portion 51 and the inclined surfaces 62 b and 62 d of the mounting recess 61 is set to the lower surface 72 b with respect to the upper surface 72 a side. The inclined surface has a long side, and is formed so as to abut on the side surface 71c of the key 71 that is interposed between the inclined surfaces 53a and 53c of the seating portion 51 and the inclined surfaces 62a and 62c of the mounting recess 61. However, when four keys 71 are assembled, a long key is inserted after a short key is inserted.

  Thus, in the cask 11 of Example 1, it is provided between the trunk | drum main body 12 which accommodates a radioactive substance, the outer cylinder 16 provided in the outer peripheral part of a trunk | drum main body, and the trunk | drum main body 12 and the outer cylinder 16. FIG. The resin (neutron shield) 18 and the seating portion 51 are composed of a plurality of suspension trunnions 30 attached to the mounting recess 61 of the trunk body 12, and the trunnion 30 surrounds the outer periphery of the seating portion 51. Inclined surfaces 53a, 53b, 53c, 53d that form a straight line in the direction and spread on the mounting side in the axial direction are formed, and the mounting recess 61 forms a straight line in the circumferential direction on the inner periphery and narrows on the opening side. The seating portion 51 is positioned in the mounting recess 61 so that the inclined surfaces 62a, 62b, 62c, 62d are formed, and the inclined surfaces 53a, 53b, 53c, 53d are opposed to the inclined surfaces 62a, 62b, 62c, 62d. , Inclined 53a, 53b, 53c, 53d and the inclined surface 62a, 62b, 62c, the key 71 between the 62d is fitted.

  Accordingly, the seating portion 51 of the trunnion 30 is configured such that the inclined surfaces 53a, 53b, 53c, and 53d are locked to the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 61 via the key 71. Since it is firmly fixed to the main body 12 and a large number of bolts are not required and the flange portion for bolt fastening can be reduced, the trunnion 30 can be reduced in size, and the component cost, manufacturing cost, etc. Can be reduced.

  In this case, the key 71 is fitted between the inclined surfaces 53a, 53b, 53c, and 53d and the inclined surfaces 62a, 62b, 62c, and 62d, and the key 71 causes the inclined surfaces 53a, 53b, 53c, and 53d and the covered surfaces to be covered. The inclined surfaces 62a, 62b, 62c, and 62d can be operated to prevent the seating portion 51 from falling off the mounting recess 61.

  In the cask 11 of the first embodiment, the seat 51 and the mounting recess 61 are square (square), and the inclined surfaces 53a, 53b, 53c, 53d and the inclined surfaces 62a, 62b, 62c, 62d are The outer peripheral portion 51 and the inner peripheral portion of the mounting recess 61 are formed on each side. Therefore, the workability can be improved by making the seating portion 51 and the mounting recess 61 square, and forming the inclined surfaces 53a, 53b, 53c, 53d and the inclined surfaces 62a, 62b, 62c, 62d on each side. .

  In the cask 11 of the first embodiment, the key 71 is fixed between the outer peripheral portion of the seating portion 51 and the inner peripheral portion of the mounting recess 61 by an interference fit. Therefore, a fastening part for fixing the key 71 is not required, the part cost can be reduced, and the structure can be simplified.

  In the fixing method of the trunnion 30 according to the first embodiment, the seat 51 of the trunnion 30 is inserted into the mounting recess 61 of the trunk body 12, and the inclined surfaces 53a, 53b, 53c, 53d and the inclined surfaces 62a, 62b are inserted. , 62c and 62d, the trunnion 30 is fixed to the trunk body 12 by fitting the key 71 therebetween. Accordingly, the seating portion 51 of the trunnion 30 is configured such that the inclined surfaces 53a, 53b, 53c, and 53d are locked to the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 61 via the key 71. Since it is firmly fixed to the main body 12 and a large number of bolts are not required and the flange portion for bolt fastening can be reduced, the trunnion 30 can be reduced in size, and the component cost, manufacturing cost, etc. Can be reduced.

  FIG. 12 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to a second embodiment of the present invention, and FIG. 13 is a cross-sectional view illustrating a trunnion mounting portion in the cask of the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the second embodiment, as shown in FIGS. 12 and 13, the number of keys 71 used for fixing the seating portion 51 of the trunnion 30 to the mounting recess 61 of the trunk body 12 is three.

  That is, when the trunnion 30 is fixed to the trunk body 12, the trunnion 30 is transferred and placed so that the seating portion 51 is positioned in the mounting recess 61 of the trunk body 12. At this time, the inclined surfaces 53a, 53b, 53c, and 53d of the seating portion 51 and the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 61 face each other so that the pair of inclined surfaces 53d and the inclined surfaces 62d are in contact with each other. On the other hand, a predetermined gap is secured between the other inclined surfaces 53a, 53b, and 53c and the inclined surfaces 62a, 62b, and 62c. Then, the three keys 71 are transferred and fitted into the gaps between the inclined surfaces 53a, 53b, 53c and the inclined surfaces 62a, 62b, 62c. Thereby, the seating portion 51 of the trunnion 30 is fixed to the mounting recess 61 of the trunk body 12.

  In this case, the left and right widths in FIG. 12 are set to be smaller by the width of the key 71 in the mounting recess 61 than the width of the first embodiment. In the seating portion 51 of the trunnion 30, the left and right widths in FIG. 12 may be set larger by the width of the key 71 than the width of the first embodiment. Each key 71 is fixed to the seating portion 51 of the trunnion 30 and the mounting recess 61 of the trunk body 12 by the same method as in the first embodiment.

  When the trunnion 30 is fixed to the trunk body 12, the seat portion 51 is placed in the mounting recess 61, and the one set of inclined surfaces 53d and the inclined surface 62d come into contact with each other, while the three sets of inclined surfaces 53a, 53b, The key 71 is fitted between the inclined surface 62c, the inclined surfaces 62a, 62b, and 62c. Accordingly, the trunnion 30 is secured to the trunk body 12 by the seating portion 51 being directly locked to the mounting recess 61 and the seating portion 51 being locked to the mounting recess 61 by each key 71. It will be fixed.

  Thus, in the cask of the second embodiment, the trunnion 30 forms the inclined surfaces 53a, 53b, 53c, 53d on the outer peripheral portion of the seating portion 51, and the inclined surface 62a on the inner peripheral portion of the mounting recess 61. , 62b, 62c, 62d, and the seating portion 51 is positioned in the mounting recess 61 so that the inclined surfaces 53a, 53b, 53c, 53d face the inclined surfaces 62a, 62b, 62c, 62d, and the inclined surface 53d. And the inclined surface 62d are brought into contact with each other, and a key 71 is fitted between the inclined surfaces 53a, 53b, 53c and the inclined surfaces 62a, 62b, 62c.

  Therefore, the seating portion 51 of the trunnion 30 is such that the inclined surfaces 53a, 53b, 53c, 53d are locked to the inclined surfaces 62a, 62b, 62c, 62d of the mounting recess 61 directly or via the key 71. Since it is firmly fixed to the body 12 and a large number of bolts are not required and the flange portion for fastening the bolts can be reduced, the trunnion 30 can be reduced in size, and the component cost and manufacturing can be reduced. Cost and the like can be reduced. Further, by reducing the number of keys 71, it is possible to reduce the component cost without reducing the mounting strength of the trunnion 30.

  FIG. 14 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 14, the number of keys 71 used for fixing the seating portion 51 of the trunnion 30 to the mounting recess 61 of the trunk body 12 is two.

  That is, when the trunnion 30 is fixed to the trunk body 12, the trunnion 30 is transferred and placed so that the seating portion 51 is positioned in the mounting recess 61 of the trunk body 12. At this time, the inclined surfaces 53a, 53b, 53c, 53d of the seating portion 51 and the inclined surfaces 62a, 62b, 62c, 62d of the mounting recess 61 are opposed to each other, and two sets of inclined surfaces 53a, 53d and the inclined surface 62a are provided. , 62d are brought into contact with each other, and a predetermined gap is secured between the other inclined surfaces 53b, 53c and the inclined surfaces 62b, 62c. Then, the two keys 71 are transferred and fitted into the gaps between the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Thereby, the seating portion 51 of the trunnion 30 is fixed to the mounting recess 61 of the trunk body 12.

  In this case, the left and right and top and bottom widths in FIG. 14 are set smaller than the width of the first embodiment by the width of the key 71 in the mounting recess 61. Note that, in the seating portion 51 of the trunnion 30, the left and right and top and bottom widths in FIG. 14 may be set larger than the width of the first embodiment by the width of the key 71. Each key 71 is fixed to the seating portion 51 of the trunnion 30 and the mounting recess 61 of the trunk body 12 by the same method as in the first embodiment.

  When the trunnion 30 is fixed to the trunk body 12, the seat portion 51 is placed in the mounting recess 61, and the two sets of inclined surfaces 53a and 53d and the inclined surfaces 62a and 62d abut, while the two sets of inclined surfaces. A key 71 is fitted between the inclined surfaces 62b and 62c. Accordingly, the trunnion 30 is secured to the trunk body 12 by the seating portion 51 being directly locked to the mounting recess 61 and the seating portion 51 being locked to the mounting recess 61 by each key 71. It will be fixed.

  Thus, in the cask of the third embodiment, the trunnion 30 forms the inclined surfaces 53a, 53b, 53c, 53d on the outer peripheral portion of the seating portion 51, and the inclined surface 62a on the inner peripheral portion of the mounting recess 61. , 62b, 62c, 62d, and the seating portion 51 is positioned in the mounting recess 61 so that the inclined surfaces 53a, 53b, 53c, 53d face the inclined surfaces 62a, 62b, 62c, 62d, and the inclined surface 53a. 53d and the inclined surfaces 62a and 62d are brought into contact with each other, and a key 71 is fitted between the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c.

  Therefore, the seating portion 51 of the trunnion 30 is such that the inclined surfaces 53a, 53b, 53c, 53d are locked to the inclined surfaces 62a, 62b, 62c, 62d of the mounting recess 61 directly or via the key 71. Since it is firmly fixed to the body 12 and a large number of bolts are not required and the flange portion for fastening the bolts can be reduced, the trunnion 30 can be reduced in size, and the component cost and manufacturing can be reduced. Cost and the like can be reduced. Further, by further reducing the number of keys 71, it is possible to reduce the component cost without reducing the mounting strength of the trunnion 30.

  FIG. 15 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 4 of the present invention, and FIG. 16 is a cross-sectional view illustrating a trunnion mounting portion in a cask according to Embodiment 4. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the fourth embodiment, as shown in FIGS. 15 and 16, the inclined surface of the seating portion 81 of the trunnion 80 and the inclined surfaces of the mounting recess 91 of the trunk body 12 are three, and the rest are the upright surface and the upright surface. The number of keys 71 used for fixing the seating portion 81 of the trunnion 80 to the mounting recess 91 of the trunk body 12 is three.

  That is, the trunnion 80 has a seating portion 81 and a latching portion 82. The seating portion 81 has a quadrangular shape, and inclined surfaces 53a, 53b, 53c are formed on three sides of the outer peripheral portion. An upright surface 83d is formed on one side. On the other hand, a mounting recess 91 in which the seat 81 of the trunnion 80 is mounted is formed at a predetermined position in the trunk body 12. The mounting recess 91 has a quadrangular shape, and inclined surfaces 62a, 62b, and 62c are formed on three sides of the inner peripheral portion, and an upright surface 92d is formed on one side.

  When the trunnion 80 is fixed to the trunk body 12, the trunnion 80 is transferred and placed so that the seating portion 81 is positioned in the mounting recess 91 of the trunk body 12. At this time, the inclined surfaces 53a, 53b, and 53c of the seating portion 81 and the inclined surfaces 62a, 62b, and 62c of the mounting recess 91 are made to face each other, and the upright surface 83d of the seating portion 81 and the upright surface of the mounting recess 91 It faces 92d. The set of upright surfaces 83d and the upright surface 92d are brought into contact with each other, and a predetermined gap is secured between the inclined surfaces 53a, 53b, and 53c and the inclined surfaces 62a, 62b, and 62c. Then, the three keys 71 are transferred and fitted into the gaps between the inclined surfaces 53a, 53b, 53c and the inclined surfaces 62a, 62b, 62c. Thereby, the seating portion 81 of the trunnion 80 is fixed to the mounting recess 91 of the trunk body 12.

  When the trunnion 80 is fixed to the trunk body 12, the seating portion 81 is placed in the mounting recess 91, and the one set of upright surfaces 83d and the upright surface 92d abut against each other, while the three sets of inclined surfaces 53a, 53b, The key 71 is fitted between the inclined surface 62c, the inclined surfaces 62a, 62b, and 62c. Therefore, the trunnion 80 is secured to the trunk body 12 by the seating portion 81 being directly locked to the mounting recess 91 and the seating portion 81 being locked to the mounting recess 91 by each key 71. It will be fixed.

  As described above, in the cask of the fourth embodiment, the trunnion 80 forms the inclined surfaces 53a, 53b, 53c and the upright surface 83d on the outer peripheral portion of the seating portion 81, and is inclined on the inner peripheral portion of the mounting recess 91. The surfaces 62a, 62b, 62c and the upright surface 92d are formed, the inclined surfaces 53a, 53b, 53c are opposed to the inclined surfaces 62a, 62b, 62c, and the upright surface 83d is opposed to the upright surface 92d. The seating portion 81 is positioned in the mounting recess 91, the upright surface 83d and the upright surface 92d are brought into contact with each other, and the key 71 is fitted between the inclined surfaces 53a, 53b, 53c and the inclined surfaces 62a, 62b, 62c. Disguise. Further, by providing the trunnion 80 and the mounting recess 91 with the upright surface 83d and the upright surface 92d, the processing can be facilitated and the workability can be improved.

  Accordingly, in the seating portion 81 of the trunnion 80, the upright surface 83d and the upright surface 92d abut, and the inclined surfaces 53a, 53b, and 53c are in contact with the inclined surfaces 62a, 62b, and 62c of the mounting recess 91 via the key 71. By being locked, it is firmly fixed to the trunk body 12, and a large number of bolts are not required, and the flange portion for fastening the bolts can be reduced. Therefore, the trunnion 80 can be reduced in size. At the same time, component costs and manufacturing costs can be reduced. Further, by making the seating portion 81 of the trunnion 80 and part of the mounting recess 91 of the trunk body 12 into the upright surface 83d and the upright surface 92d, the processing can be facilitated and the processing cost can be reduced.

  FIG. 17 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the fifth embodiment, as shown in FIG. 17, there are three inclined surfaces of the seating portion 81 of the trunnion 80 and three inclined surfaces of the mounting recess 91 of the trunk body 12, and the rest are an upright surface and an upright surface. The number of keys 71 used to fix the seating portion 81 to the mounting recess 91 of the trunk body 12 is two.

  That is, when the trunnion 80 is fixed to the trunk body 12, the trunnion 80 is transferred and placed so that the seating portion 81 is positioned in the mounting recess 91 of the trunk body 12. At this time, the inclined surfaces 53a, 53b, 53c of the seating portion 81 and the inclined surfaces 62a, 62b, 62c of the mounting recess 91 are opposed to each other, and the upright surface 83d of the seating portion 81 and the upright surface of the mounting recess 91 are set. It faces 92d. The set of upright surfaces 83d and the upright surface 92d are brought into contact with each other and the set of inclined surfaces 53a and the inclined surface 62a are brought into contact with each other, while the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c are brought into contact. A predetermined gap is secured between the two. Then, the two keys 71 are transferred and fitted into the gaps between the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Thereby, the seating portion 81 of the trunnion 80 is fixed to the mounting recess 91 of the trunk body 12.

  When the trunnion 80 is fixed to the trunk body 12, the seating portion 81 is placed in the mounting recess 91, the set of upright surfaces 83 d and the upright surface 92 d abut, and the set of inclined surfaces 53 a and the inclined surface While the surface 62a abuts, the key 71 is fitted between the two inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Therefore, the trunnion 80 is secured to the trunk body 12 by the seating portion 81 being directly locked to the mounting recess 91 and the seating portion 81 being locked to the mounting recess 91 by each key 71. It will be fixed.

  As described above, in the cask of the fifth embodiment, the trunnion 80 forms the inclined surfaces 53a, 53b, 53c and the upright surface 83d on the outer peripheral portion of the seating portion 81, and is inclined on the inner peripheral portion of the mounting recess 91. The surfaces 62a, 62b, 62c and the upright surface 92d are formed, the inclined surfaces 53a, 53b, 53c are opposed to the inclined surfaces 62a, 62b, 62c, and the upright surface 83d is opposed to the upright surface 92d. The seating portion 81 is positioned in the mounting recess 91, the upright surface 83d and the upright surface 92d, the inclined surface 53a and the inclined surface 62a are brought into contact with each other, and the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c are brought into contact with each other. A key 71 is inserted between them.

  Accordingly, in the seating portion 81 of the trunnion 80, the upright surface 83d and the upright surface 92d, the inclined surface 53a and the inclined surface 62a abut, and the inclined surfaces 53b and 53c are in contact with the inclined surfaces 62b and 62c of the mounting recess 91. By being locked through the key 71, it is firmly fixed to the trunk body 12, and a large number of bolts are not required, so that the trunnion 80 can be miniaturized and the cost of parts and manufacturing can be reduced. can do.

  FIG. 18 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 6 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the sixth embodiment, as shown in FIG. 18, the inclined surface of the seating portion 101 of the trunnion 100 and the inclined surfaces of the mounting recess 111 of the trunk body 12 are two, and the rest are the upright surface and the upright surface. The number of keys 71 used for fixing the seating portion 101 to the mounting recess 111 of the trunk body 12 is two.

  That is, when the trunnion 100 is fixed to the trunk body 12, the trunnion 100 is transferred and placed so that the seating portion 101 is positioned in the mounting recess 111 of the trunk body 12. At this time, the inclined surfaces 53b and 53c of the seating portion 101 are opposed to the inclined surfaces 62b and 62c of the mounting recess 111, and the upright surfaces 103a and 103d of the seating portion 101 and the upright surfaces 112a and 112d is made to oppose. The two sets of upright surfaces 103a and 103d and the upright surfaces 112a and 112d are brought into contact with each other, while a predetermined gap is secured between the two sets of inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Then, the two keys 71 are transferred and fitted into the gaps between the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Thereby, the seating portion 101 of the trunnion 100 is fixed to the mounting recess 111 of the trunk body 12.

  When the trunnion 100 is fixed to the trunk body 12, the seat portion 101 is placed in the mounting recess 111, and the two sets of upright surfaces 103a and 103d and the upright surfaces 112a and 112d abut, while the two sets of inclined surfaces. A key 71 is fitted between the inclined surfaces 62b and 62c. Therefore, the trunnion 100 is secured to the trunk body 12 by the seating portion 101 being directly locked to the mounting recess 111 and the seating portion 101 being locked to the mounting recess 111 by each key 71. It will be fixed.

  As described above, in the cask of the sixth embodiment, the trunnion 100 forms the inclined surfaces 53b and 53c and the upright surfaces 103a and 103d on the outer peripheral portion of the seating portion 101, and is inclined on the inner peripheral portion of the mounting recess 111. The surfaces 62b and 62c and the upright surfaces 112a and 112d are formed, the inclined surfaces 53b and 53c are opposed to the inclined surfaces 62b and 62c, and the upright surfaces 103a and 103d are opposed to the upright surfaces 112a and 112d. The seat portion 101 is positioned in the mounting recess 111, the upright surfaces 103a and 103d and the upright surfaces 112a and 112d are brought into contact with each other, and the key 71 is fitted between the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c. Disguise.

  Accordingly, in the seating portion 101 of the trunnion 100, the upright surfaces 103a and 103d and the upright surfaces 112a and 112d abut, and the inclined surfaces 53b and 53c are in contact with the inclined surfaces 62b and 62c of the mounting recess 111 via the key 71. By being locked, it is firmly fixed to the trunk body 12, and a large number of bolts are not required, and the flange portion for fastening the bolts can be reduced. Therefore, the trunnion 100 can be reduced in size. At the same time, component costs and manufacturing costs can be reduced. Moreover, by making the seating portion 101 of the trunnion 100 and part of the mounting recess 111 of the trunk body 12 into the upright surfaces 103a and 103d and the upright surfaces 112a and 112d, the processing can be facilitated and the processing cost can be reduced. In this case, by providing the inclined surfaces 53b and 53c and the inclined surfaces 62b and 62c in the axial direction and the circumferential direction of the cask, it is possible to suppress a reduction in the mounting strength of the trunnion 100.

  FIG. 19 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 7 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the seventh embodiment, as shown in FIG. 19, the inclined surface of the seating portion 121 of the trunnion 120 and the inclined surfaces of the mounting recess 131 of the trunk body 12 are two, and the rest are the upright surface and the upright surface. The number of keys 71 used for fixing the seating portion 121 of the first to the mounting recess 131 of the trunk body 12 is two. In this case, the inclined surface and the inclined surface are arranged on one side and the other side in the axial direction (longitudinal direction) of the cask, and the upright surface and the upright surface are arranged on one side and the other side in the circumferential direction of the cask. .

  That is, when the trunnion 120 is fixed to the trunk body 12, the trunnion 120 is transferred and placed so that the seating portion 121 is positioned in the mounting recess 131 of the trunk body 12. At this time, the inclined surfaces 53a and 53c of the seating portion 121 are opposed to the inclined surfaces 62a and 62c of the mounting recess 131, and the upright surfaces 123b and 123d of the seating portion 121 and the upright surfaces 132b of the mounting recess 131 are formed. It faces 132d. The two sets of upright surfaces 123b and 123d are brought into contact with the upright surfaces 132b and 132d, while a predetermined gap is secured between the two sets of inclined surfaces 53a and 53c and the inclined surfaces 62a and 62c. Then, the two keys 71 are transferred and fitted in the gaps between the inclined surfaces 53a and 53c and the inclined surfaces 62a and 62c. Thereby, the seating part 121 of the trunnion 120 is fixed to the mounting recess 131 of the trunk body 12.

  When the trunnion 120 is fixed to the trunk body 12, the seat 121 is placed in the mounting recess 131, and the two sets of upright surfaces 123b, 123d and the upright surfaces 132b, 132d are in contact with each other, while the two sets of inclined surfaces. The key 71 is fitted between the inclined surfaces 62a and 62c. Therefore, the trunnion 120 is secured to the trunk body 12 by the seating portion 121 being directly locked to the mounting recess 131 and the seating portion 121 being locked to the mounting recess 131 by each key 71. It will be fixed.

  As described above, in the cask of the seventh embodiment, the trunnion 120 forms the inclined surfaces 53a and 53c and the upright surfaces 123b and 123d on the outer peripheral portion of the seating portion 121, and is inclined on the inner peripheral portion of the mounting recess 131. The surfaces 62a and 62c and the upright surfaces 132b and 132d are formed, the inclined surfaces 53a and 53c are opposed to the inclined surfaces 62a and 62c, and the upright surfaces 123b and 123d are opposed to the upright surfaces 132b and 132d. The seat portion 121 is positioned in the mounting recess 131, the upright surfaces 123b and 123d and the upright surfaces 132b and 132d are brought into contact with each other, and the key 71 is fitted between the inclined surfaces 53a and 53c and the inclined surfaces 62a and 62c. Disguise.

  Therefore, in the seating portion 121 of the trunnion 120, the upright surfaces 123b and 123d and the upright surfaces 132b and 132d abut, and the inclined surfaces 53a and 53c are in contact with the inclined surfaces 62a and 62c of the mounting recess 131 via the key 71. By being locked, it is firmly fixed to the trunk body 12, and a large number of bolts are unnecessary, and the flange portion for fastening the bolts can be reduced. Therefore, the trunnion 120 can be reduced in size. At the same time, component costs and manufacturing costs can be reduced.

  FIG. 20 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 8 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the eighth embodiment, as shown in FIG. 20, the inclined surface of the seating portion 121 of the trunnion 120 and the inclined surfaces of the mounting recess 131 of the trunk body 12 are two, and the rest are the upright surface and the upright surface. The number of keys 71 used to fix the seating portion 121 to the mounting recess 131 of the trunk body 12 is one.

  That is, when the trunnion 120 is fixed to the trunk body 12, the trunnion 120 is transferred and placed so that the seating portion 121 is positioned in the mounting recess 131 of the trunk body 12. At this time, the inclined surfaces 53a and 53c of the seating portion 121 are opposed to the inclined surfaces 62a and 62c of the mounting recess 131, and the upright surfaces 123b and 123d of the seating portion 121 and the upright surfaces 132b of the mounting recess 131 are formed. It faces 132d. Then, the two sets of upright surfaces 123b and 123d and the upright surfaces 132b and 132d are brought into contact with each other, and the pair of inclined surfaces 53a and the inclined surface 62a are brought into contact with each other. A predetermined gap is ensured between the inclined surface 62c. Then, one key 71 is transferred and fitted in the gap between the inclined surface 53c and the inclined surface 62c. Thereby, the seating part 121 of the trunnion 120 is fixed to the mounting recess 131 of the trunk body 12.

  When the trunnion 120 is fixed to the trunk main body 12, the seat portion 121 is placed in the mounting recess 131, and the two sets of upright surfaces 123b and 123d and the upright surfaces 132b and 132d come into contact with each other, and a set of inclined surfaces. 53a and the inclined surface 62a are directly locked, while the key 71 is fitted between the pair of inclined surfaces 53c and the inclined surface 62c. Therefore, the trunnion 120 is secured to the trunk body 12 by the seat portion 121 being directly locked to the mounting recess 131 and the seat portion 121 being locked to the mounting recess 131 by one key 71. It will be fixed to.

  As described above, in the cask of the eighth embodiment, the trunnion 120 forms the inclined surfaces 53a and 53c and the upright surfaces 123b and 123d on the outer peripheral portion of the seating portion 121, and is inclined on the inner peripheral portion of the mounting recess 131. The surfaces 62a and 62c and the upright surfaces 132b and 132d are formed, the inclined surfaces 53a and 53c are opposed to the inclined surfaces 62a and 62c, and the upright surfaces 123b and 123d are opposed to the upright surfaces 132b and 132d. The seating portion 121 is positioned in the mounting recess 131, the upright surfaces 123b and 123d and the upright surfaces 132b and 132d, the inclined surface 53a and the inclined surface 62a are brought into contact with each other, and the inclined surface 53c and the inclined surface 62c are brought into contact with each other. A key 71 is inserted between them.

  Therefore, in the seating portion 121 of the trunnion 120, the upright surfaces 123b and 123d and the upright surfaces 132b and 132d abut, the inclined surface 53a and the inclined surface 62a are directly locked, and the inclined surface 53c is inclined of the mounting recess 131. By being locked to the surface 62c via the key 71, it is firmly fixed to the trunk body 12, and a large number of bolts are unnecessary, and the flange portion for fastening the bolts can be reduced. Can be reduced in size, and component costs and manufacturing costs can be reduced.

  FIG. 21 is a front view showing a trunnion mounting portion in a cask as 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 same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the ninth embodiment, as shown in FIG. 21, the inclined surface of the seating portion 141 of the trunnion 140 and the inclined surface of the mounting recess 151 of the trunk body 12 are one, and the rest are the upright surface and the upright surface. The number of keys 71 used for fixing the seating portion 141 to the mounting recess 151 of the trunk body 12 is one.

  That is, when the trunnion 140 is fixed to the trunk body 12, the trunnion 140 is transferred and placed so that the seating portion 141 is positioned in the mounting recess 151 of the trunk body 12. At this time, the inclined surface 53c of the seating portion 141 is opposed to the inclined surface 62c of the mounting recess 151, and the upright surfaces 143a, 143b, 143d of the seating portion 141 and the upright surfaces 152a, 152b of the mounting recess 151 are It faces 152d. The three sets of upright surfaces 143a, 143b, and 143d are brought into contact with the upright surfaces 152a, 152b, and 152d, while a predetermined gap is secured between the pair of inclined surfaces 53c and the inclined surface 62c. Then, one key 71 is transferred and fitted in the gap between the inclined surface 53c and the inclined surface 62c. As a result, the seating portion 141 of the trunnion 140 is fixed to the mounting recess 151 of the trunk body 12.

  When the trunnion 140 is fixed to the trunk body 12, the seat portion 141 is placed in the mounting recess 151, and the three sets of upright surfaces 143a, 143b, 143d and the upright surfaces 152a, 152b, 152d abut on each other. A key 71 is fitted between the pair of inclined surfaces 53c and the inclined surface 62c. Accordingly, the trunnion 140 is secured to the trunk body 12 by the seating portion 141 being directly locked to the mounting recess 151 and the seating portion 141 being locked to the mounting recess 151 by one key 71. It will be fixed to.

  As described above, in the cask of the ninth embodiment, the trunnion 140 forms the inclined surface 53c and the upright surfaces 143a, 143b, and 143d on the outer peripheral portion of the seating portion 141, and is inclined on the inner peripheral portion of the mounting recess 151. The surface 62c and the upright surfaces 152a, 152b, 152d are formed, the inclined surface 53c faces the inclined surface 62c, and the upright surfaces 143a, 143b, 143d face the upright surfaces 152a, 152b, 152d. The seating portion 141 is positioned in the mounting recess 151, the upright surfaces 143a, 143b, 143d and the upright surfaces 152a, 152b, 152d are brought into contact with each other, and the key 71 is fitted between the inclined surface 53c and the inclined surface 62c. Disguise.

  Accordingly, in the seating portion 141 of the trunnion 140, the upright surfaces 143a, 143b, 143d and the upright surfaces 152a, 152b, 152d abut, and the inclined surface 53c is locked to the inclined surface 62c of the mounting recess 151 via the key 71. By doing so, it will be firmly fixed to the trunk body 12 and a large number of bolts are unnecessary, and the flange part for bolt fastening can be reduced, so that the trunnion 140 can be miniaturized, Parts costs and manufacturing costs can be reduced.

  FIG. 22 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 10 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the tenth embodiment, as shown in FIG. 22, the seating portion 161 of the trunnion 160 has a hexagonal shape, and the inclined surface of the seating portion 161 of the trunnion 160 and the six inclined surfaces of the mounting recess 171 of the trunk body 12 are provided. The number of keys 71 used to fix the seating portion 161 of the trunnion 160 to the mounting recess 171 of the trunk body 12 is one.

  That is, the trunnion 160 is configured by integrally forming a seating portion 161 and a latching portion 162, and the seating portion 161 has a flat plate shape that is a polygon (in this embodiment, hexagonal) in plan view, and has the same length. The three long sides and three short stories of the same length are alternately positioned. The seating portion 161 has three long sides formed with first inclined surfaces 163a, 163b, 163c extending in the axial direction toward the mounting side of the body main body 12 to the mounting recess 171 and three short sides. On the side, second inclined surfaces 163d, 163e, and 163f are formed so as to expand toward the mounting side of the body main body 12 in the axial direction in the mounting recess 171.

  On the other hand, the mounting recess 171 has a polygonal shape (in this embodiment, a hexagonal shape) as in the case of the seating portion 161 of the trunnion 160, and has three long sides having the same length and the same length. The three short stories are located alternately. The mounting recess 171 is formed with first inclined surfaces 172a, 172b, and 172c that narrow toward the opening side at three long sides, and narrow toward the opening side at three short sides. Second inclined surfaces 172d, 172e, and 172f are formed. In this case, the seating portion 161 of the trunnion 160 is set to be slightly smaller than the mounting recess 171 of the trunk body 12.

  Therefore, when the trunnion 160 is fixed to the trunk body 12, the trunnion 160 is transferred and placed so that the seating portion 161 is positioned in the mounting recess 171 of the trunk body 12. At this time, the inclined surfaces 163a, 163b, 163c, 163d, 163e, and 163f of the seating portion 161 are opposed to the inclined surfaces 172a, 172b, 172c, 172d, 172e, and 172f of the mounting recess 171. The three inclined surfaces 163a, 163c, and 163f are brought into contact with the inclined surfaces 172a, 172c, and 172f, while the three sets of inclined surfaces 163b, 163d, and 163e are interposed between the inclined surfaces 172b, 172d, and 172e. A predetermined gap is secured. Then, one key 71 is transferred and fitted into the gap between the first inclined surface 163b and the first inclined surface 172b. As a result, the seating portion 161 of the trunnion 160 is fixed to the mounting recess 171 of the trunk body 12.

  When the trunnion 160 is fixed to the trunk body 12, the seat portion 161 is placed in the mounting recess 171, and the two first inclined surfaces 163a and 163c and the first inclined surfaces 172a and 172c are directly locked. One set of the second inclined surface 163f and the second inclined surface 172f are directly locked, while the key 71 is fitted between the one set of the first inclined surface 163b and the first inclined surface 172b. It becomes a structure. Accordingly, the trunnion 160 is secured to the trunk body 12 by the seating portion 161 being directly locked to the mounting recess 171 and the seating portion 161 being locked to the mounting recess 171 by one key 71. It will be fixed to.

  As described above, in the cask of the tenth embodiment, the seating portion 161 of the trunnion 160 and the mounting recess 171 of the trunk body 12 are hexagonal, and the first inclined surfaces 163a, 163b, 163c and the first inclined surface are formed on the outer periphery of the seating portion 161. Two inclined surfaces 163d, 163e, and 163f are alternately formed, and first inclined surfaces 172a, 172b, and 172c and second inclined surfaces 172d, 172e, and 172f are formed on the inner peripheral portion of the mounting recess 171 and face each other. As described above, the seating portion 161 is positioned in the mounting recess 171 and the inclined surfaces 163a, 163c, 163f and the inclined surfaces 172a, 172c, 172f are directly locked, and the first inclined surface 163b, the first inclined surface 172b, and the like. A key 71 is fitted between the two.

  Therefore, in the seating portion 161 of the trunnion 160, the inclined surfaces 163a, 163c, 163f are directly locked to the inclined surfaces 172a, 172c, 172f of the mounting recess 171 and the inclined surface 163b is keyed to the inclined surface 172b of the mounting recess 171. By locking through 71, the body body 12 is firmly fixed, and a large number of bolts are not required, and the flange portion for fastening the bolts can be reduced. Therefore, the trunnion 160 can be reduced in size. In addition, it is possible to reduce component costs and manufacturing costs.

  In Example 10 described above, a gap is secured between the second inclined surfaces 163d and 163e of the seating portion 161 of the trunnion 160 and the second inclined surfaces 172d and 172e of the mounting recess 171, but a key is fitted. Although the number of keys is reduced by not wearing them, the mounting strength of the trunnion 160 may be improved by inserting a key shortly into the gap.

  FIG. 23 is a front view showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 11 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the eleventh embodiment, as shown in FIG. 23, the seating portion 181 of the trunnion 180 has a regular hexagonal shape, and the inclined surface of the seating portion 181 of the trunnion 180 and the six inclined surfaces of the mounting recess 191 of the trunk body 12 are provided. The number of keys 71 used for fixing the seating portion 181 of the trunnion 180 to the mounting recess 191 of the trunk body 12 is two.

  That is, the trunnion 180 is configured by integrally forming a seating portion 181 and a hooking portion 182. The seating portion 181 has a regular hexagonal shape in plan view and has six sides having the same length. The seating portion 181 is formed with inclined surfaces 183a, 183b, 183c, 183d, 183e, and 183f that extend toward the mounting side of the body main body 12 in the mounting direction 191 in the axial direction at each side. On the other hand, the mounting recess 191 has a regular hexagonal shape in plan view and has six sides having the same length, like the seating portion 181 of the trunnion 180. The mounting recess 191 is formed with inclined surfaces 192a, 192b, 192c, 192d, 192e, and 192f that narrow toward the opening side at each side. In this case, the seating portion 181 of the trunnion 180 is set to be slightly smaller than the mounting recess 191 of the trunk body 12.

  Therefore, when the trunnion 180 is fixed to the trunk body 12, the trunnion 180 is transferred and placed so that the seating portion 181 is positioned in the mounting recess 191 of the trunk body 12. At this time, the inclined surfaces 183a, 183b, 183c, 183d, 183e, and 183f of the seating portion 181 are opposed to the inclined surfaces 192a, 192b, 192c, 192d, 192e, and 192f of the mounting recess 191. The three sets of inclined surfaces 183a, 183e, 183f and the inclined surfaces 192a, 192e, 192f are brought into contact with each other, while the three sets of inclined surfaces 183b, 183c, 183d and the inclined surfaces 192b, 192c, 192d are interposed. A predetermined gap is secured. Then, the two keys 71 are transferred and fitted into the gaps between the inclined surfaces 183b and 183c and the inclined surfaces 192b and 192c. As a result, the seating portion 181 of the trunnion 180 is fixed to the mounting recess 191 of the trunk body 12.

  When the trunnion 180 is fixed to the trunk body 12, the seating portion 181 is placed in the mounting recess 191, and the three inclined surfaces 183a, 183e, 183f and the inclined surfaces 192a, 192e, 192f are directly locked. The key 71 is fitted between the two sets of inclined surfaces 183b and 183c and the inclined surfaces 192b and 192c. Accordingly, the trunnion 180 is directly locked to the mounting recess 191 and the seating portion 181 is locked to the mounting recess 191 by the two keys 71 so that the trunnion 180 is firmly attached to the trunk body 12. It will be fixed to.

  As described above, in the cask of the eleventh embodiment, the seating portion 181 of the trunnion 180 and the mounting recess 191 of the trunk body 12 are formed in a regular hexagonal shape, and the inclined surfaces 183a, 183b, 183c, 183d, 183e, 183f are formed, inclined surfaces 192a, 192b, 192c, 192d, 192e, 192f are formed on the inner peripheral portion of the mounting recess 191, and the seating portion 181 is positioned in the mounting recess 191 so as to face each other. The surfaces 183a, 183e, 183f and the inclined surfaces 192a, 192e, 192f are directly locked, and the key 71 is fitted between the inclined surfaces 183b, 183c and the inclined surfaces 192b, 192c.

  Accordingly, in the seating portion 181 of the trunnion 180, the inclined surfaces 183a, 183e, 183f are directly locked to the inclined surfaces 192a, 192e, 192f of the mounting recess 191 and the inclined surfaces 183b, 183c are inclined surfaces 192b of the mounting recess 191. , 192c through the key 71, it is firmly fixed to the trunk body 12, and a large number of bolts are unnecessary, and the flange portion for fastening the bolts can be reduced. While being able to achieve miniaturization, it is possible to reduce component costs and manufacturing costs.

  In the eleventh embodiment described above, a clearance is secured between the inclined surface 183d of the seating portion 181 of the trunnion 180 and the inclined surface 192d of the mounting recess 191, but this is because no key is fitted. Although the number of keys is reduced, the strength of the trunnion 180 may be improved by inserting the keys shortly into the gap.

  FIG. 24 is a cross-sectional view of a principal part showing a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 12 of the present invention. FIGS. 25 and 26 are cross-sectional views of the main part showing a modification of the trunnion mounting portion in the cask of the twelfth embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted. In addition, the whole structure in the radioactive substance storage container of a present Example is as substantially the same as Example 1 mentioned above, and while using FIG. 1 thru | or FIG. 3, it demonstrates the function similar to what was demonstrated in this Example. The members having the same reference numerals are denoted by the same reference numerals and redundant description is omitted.

  In the twelfth embodiment, as shown in FIGS. 1 to 3, the trunnion 30 has the seating portion 51 placed in the mounting recess 61 of the trunk body 12, and the inclined surfaces 53a, 53b, 53c, 53d and the inclined surface 62a. , 62b, 62c, and 62d, the key 71 is fitted. In this embodiment, as shown in FIG. 24, each key 71 is formed with a mounting hole 73 penetrating vertically, and the fastening bolt 74 penetrates the mounting hole 73 of this key 71, and the tip part is a barrel. The main body 12 is screwed. Accordingly, when the fastening bolt 74 fastens the key 71 to the trunk body 12, the inclined surfaces 53 a, 53 b, 53 c, 53 d of the seating portion 51 in the trunnion 30 are locked to one side surface 72 c of each key 71. In the trunnion 30, the seat portion 51 is firmly fixed to the mounting recess 61 of the trunk body 12 by the keys 71.

  Further, in one modification of the twelfth embodiment, as shown in FIG. 25, an attachment hole 75 that opens upward is formed at the engaging portion between each key 71 and the attachment recess 61 of the trunk body 12, and is fastened. Bolts 76 are screwed into the mounting holes 75. Therefore, when the fastening bolt 76 is screwed into the key 71 and the trunk body 12, the inclined surfaces 53 a, 53 b, 53 c, 53 d of the seat portion 51 in the trunnion 30 are locked to one side surface 72 c of each key 71. Thus, in the trunnion 30, the seat portion 51 is firmly fixed to the mounting recess 61 of the trunk body 12 by the keys 71.

  Further, in another modification of the twelfth embodiment, as shown in FIG. 26, the engagement between each key 71 and the seating portion 51 of the trunnion 30 and the engagement between each key 71 and the mounting recess 61 of the trunk body 12 are provided. Caulking 77 and 78 are formed at the stop. Accordingly, the caulking 77 and 78 cause the inclined surfaces 53a, 53b, 53c, and 53d of the seating portion 51 of the trunnion 30 to be locked to one side surface 72c of each key 71. The keys 71 are firmly fixed to the mounting recesses 61 of the trunk body 12.

  In this embodiment, the fastening bolts 74 and 76 and the caulks 77 and 78 are preferably provided at a plurality of positions in the longitudinal direction of the key 71.

  As described above, in the cask of the twelfth embodiment, the seat 71 is fixed to the mounting recess 61 via the key 71 by using the fastening bolts 74 and 76 and the caulking 77 and 78. Therefore, the trunnion 30 can be firmly fixed to the trunk body 12 by securely fixing the key 71.

  FIG. 27 is a front view illustrating a trunnion mounting portion in a cask as a radioactive substance storage container according to Embodiment 13 of the present invention, and FIG. 28 is a cross-sectional view illustrating the trunnion mounting portion in the cask of Embodiment 13. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the thirteenth embodiment, as shown in FIGS. 27 and 28, the number of keys 71 used for fixing the seating portion 211 of the trunnion 210 to the mounting recess 221 of the trunk body 12 is four. Further, in the present embodiment, curved portions are formed in adjacent portions between sides on the outer peripheral portion of the seating portion 211 and the inner peripheral portion of the mounting recess 221.

  That is, the trunnion 210 is configured by integrally forming a seating portion 211 and a hooking portion 212, and the seating portion 211 has a regular tetragonal shape in plan view and has four sides having the same length. The seating portion 211 is formed with inclined surfaces 53a, 53b, 53c, and 53d that extend toward the mounting side of the body main body 12 in the axial direction in the mounting recess 221 at each side. On the other hand, the mounting recess 221 has four sides of the same length in a plan view as in the case of the seating portion 211 of the trunnion 210. The mounting recess 221 is formed with inclined surfaces 62a, 62b, 62c, and 62d that narrow toward the opening side at each side.

  Further, in the seating portion 211 of the trunnion 210, first arc portions 214a, 214b, 214c, and 214d as curved portions are formed between the inclined surfaces 53a, 53b, 53c, and 53d, respectively. A second arc portion 215 as a curved portion is formed between the inclined surfaces 53a, 53b, 53c, 53d and the first arc portions 214a, 214b, 214c, 214d and the bottom surface 51a. On the other hand, in the mounting recess 221, first arc portions 223a, 223b, 223c, and 223d as curved portions are formed between the inclined surfaces 62a, 62b, 62c, and 62d, respectively. Further, a second arcuate portion 224 as a curved portion is formed between the inclined surfaces 62a, 62b, 62c, 62d and the first arcuate portion curve portions 223a, 223b, 223c, 223d and the bottom surface 61a. Yes.

  Therefore, when the trunnion 210 is fixed to the trunk body 12, the trunnion 210 is transferred and placed so that the seating portion 211 is positioned in the mounting recess 221 of the trunk body 12. At this time, the inclined surfaces 53a, 53b, 53c, and 53d of the seating portion 211 and the inclined surfaces 62a, 62b, 62c, and 62d of the mounting recess 221 are opposed to each other, and the inclined surfaces 53a, 53b, 53c, and 53d and the inclined surfaces are inclined. A predetermined gap is secured between the surfaces 62a, 62b, 62c, and 62d. Then, the four keys 71 are transferred and fitted in the gaps between the inclined surfaces 53a, 53b, 53c, 53d and the inclined surfaces 62a, 62b, 62c, 62d. As a result, the seating portion 211 of the trunnion 210 is fixed to the mounting recess 221 of the trunk body 12.

  When the trunnion 210 is fixed to the trunk body 12, the seating portion 211 is placed in the mounting recess 221, and between all the inclined surfaces 53a, 53b, 53c, 53d and the inclined surfaces 62a, 62b, 62c, 62d. The key 71 is fitted. Accordingly, the trunnion 210 is secured to the trunk body 12 by the seating portion 211 being directly locked to the mounting recess 221 and the seating portion 211 being locked to the mounting recess 221 by the respective keys 71. It will be fixed.

  Thus, in the cask of the thirteenth embodiment, the first circular arc portions 214a, 214b, 214c, and 214d are formed between the inclined surfaces 53a, 53b, 53c, and 53d in the seating portion 211 of the trunnion 210, and While the second arc portion 215 is formed, the mounting recess 221 forms the first arc portions 223a, 223b, 223c, 223d between the inclined surfaces 62a, 62b, 62c, 62d, and the second arc portion A portion 224 is formed.

  Accordingly, the first arcuate portions 214a, 214b, 214c, 214d and the second arcuate portion 215 are formed, and the first arcuate portions 223a, 223b, 223c, 223d and the second arcuate portion 224 are formed. The recesses 221 and the inclined surfaces 62a, 62b, 62c, and 62d can be easily processed, and the processability can be improved.

  In each embodiment described above, the shape of the seating portion in the trunnion is not limited to the shape of each embodiment described above, and is not limited to a polygon, Also good. Further, the shape of the mounting concave portion of the trunk body is not limited to the shape of each of the above-described embodiments, and is not limited to a polygon, and may be a shape in which a straight portion is provided in a part of a circle. In this case, it is not necessary to make the seating portion of the trunnion and the mounting recess of the trunk body the same shape. What is necessary is just to be able to latch to an attachment recessed part.

  The radioactive substance storage container and the trunnion mounting method according to the present invention can reduce the trunnion and reduce the cost by fitting a key between the trunnion inclined surface and the inclined surface of the mounting recess. It can be applied to any kind of radioactive substance storage container.

11 Cask (radioactive substance storage container)
12 body 16 outer cylinder 17 heat transfer fin 18 resin (neutron shield)
22 Lid 30, 80, 100, 120, 140, 160, 180, 210 Trunnion 51, 81, 101, 121, 141, 161, 181, 211 Seating part 52, 82, 102, 122, 142, 162, 182, 212 latching parts 53a, 53b, 53c, 53d, 183a, 183b, 183c, 183d, 183e, 183f inclined surfaces 61, 91, 111, 131, 151, 171, 191, 221 mounting recesses 62a, 62b, 62c, 62d, 192a, 192b, 192c, 192d, 192e, 192f Inclined surface 71 Key 72c, 72d Side surface 74, 76 Fastening bolt 77, 78 Caulking 83d, 103a, 103d, 123b, 123d, 143a, 143b, 143d Upright surface 92d, 112a, 112d, 132b, 13 d, 152a, 152b, 152d Upright surfaces 163a, 163b, 163c First inclined surfaces 163d, 163e, 163f Second inclined surfaces 172a, 172b, 172c First inclined surfaces 172d, 172e, 172f Second inclined surfaces 214a, 214b, 214c, 214d First arc portion (curved portion)
223a, 223b, 223c, 223d First arc portion (curved portion)
215 Second arc part (curved part)
224 Second circular arc part (curved part)

Claims (7)

A trunk body for storing radioactive material;
A plurality of trunnions for hanging, the seating part of which is mounted in the mounting recess of the trunk body;
With
The trunnion is formed with an inclined surface extending on the mounting side in the axial direction of the trunnion while the outer peripheral portion of the seating portion is linear in the circumferential direction,
The mounting recess is formed with an inclined surface that has an inner peripheral portion that is linear in the circumferential direction and narrows toward the opening side,
In the trunnion, the seating portion is inserted into the mounting recess so that the inclined surface faces the inclined surface, and a key is fitted between the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess. By being mounted, it is fixed to the trunk body.
A radioactive substance storage container.   The radioactive substance storage container according to claim 1, wherein the key is fitted between the inclined surface and the inclined surface.   The seating portion and the mounting recess have a polygonal shape in plan view, and the inclined surface and the inclined surface are formed on at least one side of the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess. The radioactive substance storage container according to claim 1 or 2.   The inclined surface and the inclined surface are formed on all sides of the outer peripheral portion of the seating portion and the inner peripheral portion of the mounting recess, and at least one piece includes the key between the inclined surface and the inclined surface. In the side where the key is not fitted between the inclined surface and the inclined surface, the inclined surface and the inclined surface are in contact with each other and fixed to the trunk body. The radioactive substance storage container according to claim 3.   The radioactive substance storage container according to any one of claims 1 to 4, wherein a curved portion is formed in an adjacent portion between the sides on an inner peripheral portion of the mounting recess.   6. The radioactive substance storage according to claim 1, wherein the key is fixed between an outer peripheral portion of the seating portion and an inner peripheral portion of the mounting recess by an interference fit. container. A trunk body for storing radioactive material;
A plurality of lifting trunnions in which the seating portion is mounted in the mounting recess of the trunk body;
In a radioactive substance storage container comprising:
Inserting the seat of the trunnion into the mounting recess of the trunk body,
By fitting a key between the outer periphery of the seating portion and the inner periphery of the mounting recess,
An inclined surface in which the outer peripheral portion of the seating portion is linear in the circumferential direction and extends toward the mounting side in the axial direction, and an inclined surface in which the inner peripheral portion of the mounting recess is linear in the circumferential direction and narrows toward the opening side To act to fix the trunnion to the trunk body,
Trunnion mounting method characterized by the above.

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