JP4724702B2 - Container for transport and storage of radioactive materials - Google Patents
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- JP4724702B2 JP4724702B2 JP2007285112A JP2007285112A JP4724702B2 JP 4724702 B2 JP4724702 B2 JP 4724702B2 JP 2007285112 A JP2007285112 A JP 2007285112A JP 2007285112 A JP2007285112 A JP 2007285112A JP 4724702 B2 JP4724702 B2 JP 4724702B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Description
本発明は、使用済核燃料などの放射性物質の輸送兼貯蔵用容器に関する。 The present invention relates to a container for transporting and storing radioactive materials such as spent nuclear fuel.
この種の技術として特許文献１は、γ線を遮蔽する胴本体と、この胴本体の周囲に配置した中性子遮蔽体と、この中性子遮蔽体を収容する外筒と、を有する放射性物質格納容器（キャスク）を開示する。このキャスクの胴本体は、主に密封機能を有する有底筒状の内容器と、主にγ線遮蔽機能を有する有底筒状の外容器と、から構成される。外容器は、筒体及び底板から構成される。この底板は、軸方向において筒体を完全に覆い、例えば溶接やボルト締結によって該筒体の端面に固定される。 As this kind of technology, Patent Document 1 discloses a radioactive substance storage container (having a trunk body that shields γ-rays, a neutron shield disposed around the trunk body, and an outer cylinder that accommodates the neutron shield ( Cask) is disclosed. The trunk main body of the cask is composed of a bottomed cylindrical inner container mainly having a sealing function and a bottomed cylindrical outer container mainly having a gamma ray shielding function. The outer container is composed of a cylinder and a bottom plate. The bottom plate completely covers the cylindrical body in the axial direction, and is fixed to the end surface of the cylindrical body, for example, by welding or bolt fastening.
しかし、上記特許文献１の構成では、所謂９ｍ落下試験（垂直）の際に下記の問題が生じる。即ち、落下時の筒体の慣性力が、該筒体と底板との固定部に直接的に作用するので、筒体に対する底板の固定の状態に支障を来たし、外容器の大きな変形が許容され、その結果、外容器が内容器を十分には保護できなくなる。一方、この固定状態に支障を来さないように大掛かりな溶接処理を施しておくのも一つの解決策ではある。しかし、これだと、溶接残留応力を除去するための煩わしい焼き鈍し処理が必要となってくる。 However, in the configuration of Patent Document 1, the following problem occurs during a so-called 9-m drop test (vertical). That is, since the inertial force of the cylindrical body at the time of dropping directly acts on the fixing portion between the cylindrical body and the bottom plate, the state of fixing the bottom plate to the cylindrical body is hindered, and a large deformation of the outer container is allowed. As a result, the outer container cannot sufficiently protect the inner container. On the other hand, it is also one solution to perform a large-scale welding process so as not to hinder the fixed state. However, this requires a troublesome annealing process to remove the welding residual stress.
本発明は斯かる諸点に鑑みてなされたものであり、その主な目的は、落下時の慣性力が外容器の構造に与える影響の小さい放射性物質の輸送兼貯蔵用容器を提供することにある。 The present invention has been made in view of these points, and a main object of the present invention is to provide a container for transporting and storing a radioactive substance that has a small influence on the structure of the outer container by the inertial force at the time of dropping. .
本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段とその効果を説明する。 The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.
本発明の第一の観点によれば、以下のように構成される、放射性物質の輸送兼貯蔵用容器が提供される。即ち、放射性物質の輸送兼貯蔵用容器は、放射性物質が収容される内容器と、該内容器の外側に配され、筒体と、この筒体の端部に配される底板と、から成り、γ線遮蔽機能を発揮する有底筒状の外容器と、前記筒体に対して固定される底板支持部材とを備える。前記底板は、前記筒体により形成される円柱空間の内側に配され、該筒体の内周に対して固定される。前記底板支持部材は、環状に形成され、前記外容器の前記筒体よりも大径の外嵌部を有するとともに、前記底板支持部材は、前記外嵌部を前記筒体の端部に対して外嵌することで、前記端部に固定される。前記底板は、前記筒体と前記底板支持部材とによって挟持されることで前記筒体の内周に対して固定される。以上の構成によれば、落下の際、前記筒体が例えば作業床などの衝突対象に対して前記底板を介することなく衝突するので、落下時の前記筒体の慣性力が前記筒体と底板との固定部に対して直接的には作用せず、この意味で、落下時の慣性力が外容器の構造に与える影響が小さい。また、前記筒体に対する前記底板の固定が、挟持という簡素な手段によって実現される。 According to the first aspect of the present invention, there is provided a container for transporting and storing radioactive materials, which is configured as follows. That is, a radioactive substance transport / storage container is composed of an inner container that contains a radioactive substance, a cylinder that is disposed outside the inner container, and a bottom plate that is disposed at an end of the cylinder. comprises a bottomed cylindrical outer container which exhibits a γ ray shielding function, and a bottom plate supporting member which is fixed relative to the cylinder. Before Kisokoban is disposed inside the cylindrical space formed by the cylinder is fixed to the inner circumference of the cylindrical body. The bottom plate support member is formed in an annular shape and has an outer fitting portion having a diameter larger than that of the cylindrical body of the outer container, and the bottom plate support member has the outer fitting portion with respect to an end portion of the cylindrical body. It is fixed to the end by external fitting. The bottom plate is fixed to the inner periphery of the cylindrical body by being sandwiched between the cylindrical body and the bottom plate supporting member. According to the above configuration, at the time of dropping, the cylindrical body collides against a collision target such as a work floor without passing through the bottom plate, so that the inertial force of the cylindrical body at the time of dropping is the cylindrical body and the bottom plate. In this sense, the influence of the inertial force at the time of dropping on the structure of the outer container is small. Moreover, the fixing of the bottom plate to the cylindrical body is realized by simple means of clamping.
上記の放射性物質の輸送兼貯蔵用容器は、更に、以下のように構成される。前記底板は、前記筒体の前記端部の端面から離して配される。以上の構成によれば、落下の際、前記筒体が例えば作業床などの衝突対象に対して前記底板よりも先に衝突して変形し始めるので、その分、前記底板の変形が抑制される。 The container for transporting and storing the radioactive substance is further configured as follows. The bottom plate is disposed away from an end surface of the end portion of the cylindrical body. According to the above configuration, when falling, the cylinder collides with a collision target such as a work floor before the bottom plate and starts to deform, so that the deformation of the bottom plate is suppressed accordingly. .
上記の放射性物質の輸送兼貯蔵用容器は、更に、以下のように構成される。前記底板支持部材は、前記筒体に対して焼きばめにより固定される。以上の構成によれば、生産性に寄与する。 The container for transporting and storing the radioactive substance is further configured as follows. The bottom plate support member is fixed to the cylinder by shrink fitting. According to the above structure, it contributes to productivity.
上記の放射性物質の輸送兼貯蔵用容器は、更に、以下のように構成される。前記外容器の筒体は前記内容器に対して焼ばめされる。以上の構成によれば、生産性に寄与する。 The container for transporting and storing the radioactive substance is further configured as follows. The cylinder of the outer container is shrink-fitted with respect to the inner container. According to the above structure, it contributes to productivity.
以下、図１を参照しつつ、本発明の第一実施形態を説明する。図１は、本発明の第一実施形態に係る放射性物質の輸送兼貯蔵用容器の縦断面図である。 Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view of a radioactive material transport / storage container according to a first embodiment of the present invention.
本実施形態において輸送兼貯蔵用容器１は、放射性物質が収容される有底筒状の内容器２と、この内容器２の外側に配され、γ線遮蔽機能を発揮する有底筒状の外容器３と、を備える。内容器２は、内筒体２Ａと、この内筒体２Ａの上端に溶接される内フランジ２Ｂと、内筒体２Ａの下端に溶接される内底板２Ｃと、から成る。外容器３は、外筒体３Ａ（筒体）と、この外筒体３Ａの端部３Ｂに配される外底板３Ｃと、から成る。内底板２Ｃと外底板３Ｃは略同一形状であって相互に面接触する関係にある。外容器３は、内容器２と比較して肉厚である。外容器３の外筒体３Ａは、内容器２の内筒体２Ａに対して焼きばめされる。 In the present embodiment, the container 1 for transportation and storage is a bottomed cylindrical inner container 2 that contains a radioactive substance, and a bottomed cylindrical inner container 2 that is disposed outside the inner container 2 and exhibits a γ-ray shielding function. An outer container 3. The inner container 2 includes an inner cylinder 2A, an inner flange 2B welded to the upper end of the inner cylinder 2A, and an inner bottom plate 2C welded to the lower end of the inner cylinder 2A. The outer container 3 includes an outer cylindrical body 3A (cylindrical body) and an outer bottom plate 3C disposed on the end 3B of the outer cylindrical body 3A. The inner bottom plate 2C and the outer bottom plate 3C have substantially the same shape and are in surface contact with each other. The outer container 3 is thicker than the inner container 2. The outer cylinder 3A of the outer container 3 is shrink-fitted with respect to the inner cylinder 2A of the inner container 2.
輸送兼貯蔵用容器１は、外容器３の外筒体３Ａの外周側に配される中性子遮蔽体４と、この中性子遮蔽体４の更に外周側に配される外筒５と、を更に備える。中性子遮蔽体４は、外容器３の外筒体３Ａと、外筒５と、の間に介装される。 The transport and storage container 1 further includes a neutron shield 4 disposed on the outer peripheral side of the outer cylinder 3 </ b> A of the outer container 3, and an outer cylinder 5 disposed on the further outer peripheral side of the neutron shield 4. . The neutron shield 4 is interposed between the outer cylinder 3 </ b> A of the outer container 3 and the outer cylinder 5.
輸送兼貯蔵用容器１は、輸送兼貯蔵用容器１のハンドリングに供される複数のトラニオン６と、上蓋７と、下蓋８と、を更に備える。上蓋７は、内容器２の開口を閉塞するものであって、略示のボルトによって内容器２の内フランジ２Ｂに強固に固定される。内容器２の開口が上蓋７によって閉塞されることで、放射性物質の収容空間９が形成される。下蓋８は、外容器３の外底板３Ｃを外側から覆うものであって、図略のボルトなどによって端部３Ｂに対して固定される。 The transport / storage container 1 further includes a plurality of trunnions 6 used for handling the transport / storage container 1, an upper lid 7, and a lower lid 8. The upper lid 7 closes the opening of the inner container 2, and is firmly fixed to the inner flange 2 </ b> B of the inner container 2 by a schematically illustrated bolt. The opening of the inner container 2 is closed by the upper lid 7 so that a radioactive substance storage space 9 is formed. The lower lid 8 covers the outer bottom plate 3C of the outer container 3 from the outside, and is fixed to the end portion 3B by a bolt or the like not shown.
内容器２は、密封性能の担保のため、低温靭性に優れた材料であるステンレス鋼やニッケル鋼が採用され、一方、外容器３は、γ線遮蔽機能を有する材料であればその種別を問わず、例えば、低温靭性を有さない一般的な炭素鋼で足りる。このような事情から、一般に、内容器２は、外容器３と比較して材料費が嵩む。 The inner container 2 is made of stainless steel or nickel steel, which is excellent in low temperature toughness, to ensure sealing performance. On the other hand, the outer container 3 can be of any type as long as it has a γ-ray shielding function. For example, a general carbon steel having no low temperature toughness is sufficient. Under such circumstances, the inner container 2 generally has higher material costs than the outer container 3.
図４を参照されたい。図４は、図１の４−４線矢視断面図である。本図に示されるように、中性子遮蔽体４は、ブロック状の中性子遮蔽ブロック４ａを周方向に複数並べて構成され、各中性子遮蔽ブロック４ａは、水素を含む有機材料として、例えばエチレンプロピレン系ゴムから成る。隣り合う中性子遮蔽ブロック４ａの間には、外容器３の外筒体３Ａと外筒５とを熱的に接続する熱良伝導体１５が多数、介挿される。この熱良伝導体１５は、例えばアルミニウムやアルミニウム合金、銅、銅合金など、熱伝導性が良好なものより成る。 Please refer to FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. As shown in the figure, the neutron shield 4 is configured by arranging a plurality of block-shaped neutron shield blocks 4a in the circumferential direction. Each neutron shield block 4a is made of, for example, ethylene propylene rubber as an organic material containing hydrogen. Become. A large number of good thermal conductors 15 that thermally connect the outer cylinder 3 </ b> A of the outer container 3 and the outer cylinder 5 are interposed between adjacent neutron shielding blocks 4 a. The good thermal conductor 15 is made of a material having good thermal conductivity, such as aluminum, an aluminum alloy, copper, or a copper alloy.
再度、図１を参照されたい。内フランジ２Ｂは、外容器３の外筒体３Ａの上端を覆うように形成される。このため、垂直落下の際の内容器２の慣性力は、この内フランジ２Ｂを介して外容器３の外筒体３Ａの上端によっても受け止められることとなる。 Please refer to FIG. 1 again. The inner flange 2B is formed so as to cover the upper end of the outer cylinder 3A of the outer container 3. For this reason, the inertial force of the inner container 2 at the time of the vertical drop is also received by the upper end of the outer cylinder 3A of the outer container 3 through the inner flange 2B.
次に、図２を参照されたい。図２は、図１の部分拡大図である。本図に示されるように、外容器３の外底板３Ｃは、外筒体３Ａにより形成される円柱空間３Ｄ（二点鎖線で大まかに示す。この二点鎖線は、図面の見易さの観点から他の実線等から若干離して描いている。）の内側に配されると共に、該外筒体３Ａの内周に対して溶接により固定される。外容器３の外底板３Ｃは、端部３Ｂの端面３Ｆから内方へ向かって若干離して配される。本図において符号３Ｗで示される溶接箇所は、外容器３の外筒体３Ａと外底板３Ｃの境界である円弧に沿って連続的に又は間欠的に設けられる。このような構成により、外容器３の端部３Ｂの端面３Ｆは、そのまま、輸送兼貯蔵用容器１の底面としての位置づけとなる。 Reference is now made to FIG. FIG. 2 is a partially enlarged view of FIG. As shown in this figure, the outer bottom plate 3C of the outer container 3 is a cylindrical space 3D formed by the outer cylindrical body 3A (shown roughly by a two-dot chain line. This two-dot chain line is a viewpoint for easy viewing of the drawing. To the inner circumference of the outer cylindrical body 3A, and is fixed by welding. The outer bottom plate 3C of the outer container 3 is disposed slightly apart from the end surface 3F of the end portion 3B inward. In this figure, the welding location indicated by reference numeral 3W is provided continuously or intermittently along an arc that is the boundary between the outer cylinder 3A and the outer bottom plate 3C of the outer container 3. With such a configuration, the end surface 3F of the end 3B of the outer container 3 is positioned as the bottom surface of the transport / storage container 1 as it is.
外底板３Ｃを覆う下蓋８は、上記の中性子遮蔽体４と同素材から成る中性子遮蔽材１０と、外筒５と同素材から成る蓋１１と、から構成される。そして、内底板２Ｃと外底板３Ｃ、中性子遮蔽材１０、蓋１１は、この順で積層される関係となる。この蓋１１は、外容器３の端部３Ｂに対して例えば溶接やボルト締結によって固定される。本実施形態において蓋１１は端面３Ｆと面一となっている。 The lower lid 8 covering the outer bottom plate 3C is composed of a neutron shielding material 10 made of the same material as the neutron shielding body 4 and a lid 11 made of the same material as the outer cylinder 5. Then, the inner bottom plate 2C, the outer bottom plate 3C, the neutron shielding material 10, and the lid 11 are stacked in this order. The lid 11 is fixed to the end 3B of the outer container 3 by, for example, welding or bolt fastening. In the present embodiment, the lid 11 is flush with the end surface 3F.
以上説明したように本実施形態において輸送兼貯蔵用容器１は、以下のように構成される。即ち、輸送兼貯蔵用容器１は、放射性物質が収容される内容器２と、該内容器２の外側に配され、γ線遮蔽機能を発揮する有底筒状の外容器３と、を備える。この外容器３は、外筒体３Ａと、この外筒体３Ａの端部３Ｂに配される外底板３Ｃと、から成る。前記外底板３Ｃは、前記外筒体３Ａにより形成される円柱空間３Ｄの内側に配され、該外筒体３Ａの内周に対して固定される。以上の構成によれば、落下の際、前記外筒体３Ａが例えば作業床などの衝突対象に対して前記外底板３Ｃを介することなく衝突するので、落下時の前記外筒体３Ａの慣性力が前記の外筒体３Ａと外底板３Ｃとの固定部３Ｇに対して直接的には作用せず、この意味で、落下時の慣性力が外容器３の構造に与える影響が小さい。 Transport and storage container 1 in the present embodiment, as described on more than are configured as follows. That is, the transport and storage container 1 includes an inner container 2 that stores a radioactive substance, and a bottomed cylindrical outer container 3 that is disposed outside the inner container 2 and exhibits a γ-ray shielding function. . The outer container 3 includes an outer cylindrical body 3A and an outer bottom plate 3C disposed on the end 3B of the outer cylindrical body 3A. The outer bottom plate 3C is disposed inside a cylindrical space 3D formed by the outer cylindrical body 3A, and is fixed to the inner periphery of the outer cylindrical body 3A. According to the above configuration, when falling, the outer cylindrical body 3A collides with a collision target such as a work floor without passing through the outer bottom plate 3C, so the inertial force of the outer cylindrical body 3A at the time of dropping Does not directly act on the fixing portion 3G between the outer cylindrical body 3A and the outer bottom plate 3C, and in this sense, the influence of the inertial force at the time of dropping on the structure of the outer container 3 is small.
更に言えば、「落下時の慣性力が外容器３の構造に与える影響が小さい」とは、外容器３の構造が強度上、優れていることを意味するから、内容器２の密封機能を確保するために必要となる内容器２の肉厚も多かれ少なかれ減じることができる。 Furthermore, “the inertial force at the time of dropping has little influence on the structure of the outer container 3” means that the structure of the outer container 3 is superior in strength. The wall thickness of the inner container 2 required for securing can be reduced more or less.
上記の輸送兼貯蔵用容器１は、更に、以下のように構成される。即ち、前記外底板３Ｃは、前記外筒体３Ａの前記端部３Ｂの端面３Ｆから離して配される。以上の構成によれば、落下の際、前記外筒体３Ａが例えば作業床などの衝突対象に対して前記外底板３Ｃよりも先に衝突して変形し始めるので、その分、前記外底板３Ｃの変形が抑制される。 Transport and storage container 1 above SL is further configured as follows. That is, the outer bottom plate 3C is disposed away from the end surface 3F of the end 3B of the outer cylinder 3A. According to the above configuration, when falling, the outer cylindrical body 3A collides with an object to be collided such as a work floor before the outer bottom plate 3C and starts to be deformed. Is prevented from being deformed.
なお、このように外底板３Ｃの変形が抑制されるなら、同時に内容器２の内底板２Ｃの変形も抑制される。それ故、上記同様、内容器２の密封機能を確保するために必要となる内容器２の肉厚を更に減じることができる。 If the deformation of the outer bottom plate 3C is suppressed in this way, the deformation of the inner bottom plate 2C of the inner container 2 is also suppressed at the same time. Therefore, as described above, it is possible to further reduce the wall thickness of the inner container 2 necessary for ensuring the sealing function of the inner container 2.
上記の輸送兼貯蔵用容器１は、更に、以下のように構成される。即ち、前記外容器３の外筒体３Ａは前記内容器２に対して焼ばめされる。以上の構成によれば、生産性に寄与する。即ち、外容器３の外筒体３Ａを内容器２に対して溶接により固定すると、溶接残留応力を除去するための焼き鈍し処理が必要となる。これに対して、外容器３の外筒体３Ａを内容器２に対して焼きばめにより固定すると、焼き鈍し処理といったような煩わしいステップが不要となる。この意味で、前記外容器３の外筒体３Ａが前記内容器２に対して焼ばめされる構成は、生産性に寄与するといえる。 Transport and storage container 1 above SL is further configured as follows. That is, the outer cylinder 3 </ b> A of the outer container 3 is shrink-fitted with respect to the inner container 2. According to the above structure, it contributes to productivity. That is, when the outer cylinder 3A of the outer container 3 is fixed to the inner container 2 by welding, an annealing process for removing the welding residual stress is required. On the other hand, if the outer cylindrical body 3A of the outer container 3 is fixed to the inner container 2 by shrink fitting, a troublesome step such as an annealing process becomes unnecessary. In this sense, it can be said that the configuration in which the outer cylindrical body 3A of the outer container 3 is shrink-fitted with respect to the inner container 2 contributes to productivity.
次に、図３を参照しつつ、本発明の第二実施形態を説明する。図３は、図２に類似する図であって、本発明の第二実施形態に係る図である。 Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a view similar to FIG. 2 and according to the second embodiment of the present invention.
本実施形態において端部３Ｂの端面３Ｆは、外底板３Ｃと面一とされ、外底板３Ｃから径方向外側へ突設される鍔部３Ｈは、外筒体３Ａに対して軸方向において若干、重複する。そして、環状に形成され、外容器３の外筒体３Ａよりも大径の外嵌部１２ａを有する底板支持部材１２が、外嵌部１２ａを外筒体３Ａの端部３Ｂに対して焼きばめによって外嵌することで、端部３Ｂに固定される。このとき、外容器３の端面３Ｆと軸方向において対向する底板支持部材１２の面としての挟持面１２ｂは、この端面３Ｆのみならず、鍔部３Ｈに対しても圧接する。同様に、鍔部３Ｈと軸方向において対向する端部３Ｂの面としての挟持面３ｂは、鍔部３Ｈに対して圧接する。こうして、外底板３Ｃは、底板支持部材１２の挟持面１２ｂと、端部３Ｂの挟持面３ｂと、によって軸方向で挟持されることによって、外容器３の外筒体３Ａの内周に対して強力に固定される。 In the present embodiment, the end surface 3F of the end portion 3B is flush with the outer bottom plate 3C, and the flange portion 3H protruding radially outward from the outer bottom plate 3C is slightly in the axial direction with respect to the outer cylindrical body 3A. Duplicate. And if the baseplate support member 12 which is formed in an annular shape and has an outer fitting portion 12a having a larger diameter than the outer cylindrical body 3A of the outer container 3, the outer fitting portion 12a is baked on the end portion 3B of the outer cylindrical body 3A. It is fixed to the end portion 3B by being externally fitted. At this time, the clamping surface 12b as the surface of the bottom plate support member 12 facing the end surface 3F of the outer container 3 in the axial direction is in pressure contact with not only the end surface 3F but also the flange portion 3H. Similarly, the clamping surface 3b as the surface of the end 3B facing the flange 3H in the axial direction is in pressure contact with the flange 3H. In this way, the outer bottom plate 3C is axially clamped by the clamping surface 12b of the bottom plate support member 12 and the clamping surface 3b of the end 3B, so that the outer bottom plate 3C is against the inner circumference of the outer cylindrical body 3A of the outer container 3. Strongly fixed.
なお、前述の下蓋８は、底板支持部材１２の内周側に配される。 The lower lid 8 is disposed on the inner peripheral side of the bottom plate support member 12.
以上説明したように本実施形態において輸送兼貯蔵用容器１は、以下のように構成される。即ち、輸送兼貯蔵用容器１は、前記外筒体３Ａに対して固定される底板支持部材１２を備える。前記底板支持部材１２は、環状に形成され、前記外容器３の前記外筒体３Ａよりも大径の外嵌部１２ａを有するとともに、前記底板支持部材１２は、前記外嵌部１２ａを前記外筒体３Ａの端部３Ｂに対して外嵌することで、前記端部３Ｂに固定される。前記外底板３Ｃは、前記外筒体３Ａと底板支持部材１２によって挟持されることによって前記外筒体３Ａの内周に対して固定される。以上の構成によれば、前記外筒体３Ａに対する前記外底板３Ｃの固定が、挟持という簡素な手段によって実現される。即ち、前述と同様、溶接による手段と比較するならば、焼き鈍し処理といったような煩わしいステップが不要となる。なお、本実施形態において垂直落下の際の外底板３Ｃの慣性力は、底板支持部材１２によって受け止められることとなる。 Transport and storage container 1 in the present embodiment, as described on more than are configured as follows. That is, the transport / storage container 1 includes a bottom plate support member 12 that is fixed to the outer cylindrical body 3A. The bottom plate support member 12 is formed in an annular shape and has an outer fitting portion 12a having a diameter larger than that of the outer cylindrical body 3A of the outer container 3, and the bottom plate support member 12 has the outer fitting portion 12a outside the outer fitting portion 12a. It is fixed to the end portion 3B by being externally fitted to the end portion 3B of the cylindrical body 3A. The outer bottom plate 3C is fixed to the inner periphery of the outer cylindrical body 3A by being sandwiched between the outer cylindrical body 3A and the bottom plate support member 12. According to the above configuration, fixing of the outer bottom plate 3C to the outer cylindrical body 3A is realized by simple means of clamping. That is, as described above, a troublesome step such as annealing is not necessary when compared with welding means. In the present embodiment, the inertial force of the outer bottom plate 3 </ b> C during the vertical drop is received by the bottom plate support member 12.
更に、上記の輸送兼貯蔵用容器１は、以下のように構成される。前記底板支持部材１２は、前記外筒体３Ａに対して焼きばめにより固定される。以上の構成によれば、生産性に寄与する。これは即ち、底板支持部材１２を追加することによって部品点数が増えたからといって、必ずしも焼き鈍し処理が必要となるとは限らないということを意味する。 In further transport and storage vessel 1 above is constructed as follows. The bottom plate support member 12 is fixed to the outer cylinder 3A by shrink fitting. According to the above structure, it contributes to productivity. This means that just because the number of parts is increased by adding the bottom plate support member 12, annealing treatment is not necessarily required.
１ 輸送兼貯蔵用容器
２ 内容器
３ 外容器
３Ａ 外筒体（筒体）
３Ｂ 端部
３Ｃ 外底板（底板）
３Ｄ 円柱空間
1 Container for transportation and storage 2 Inner container 3 Outer container 3A Outer cylinder (cylinder)
3B End 3C Outer bottom plate (bottom plate)
3D cylindrical space
Claims (4)
該内容器の外側に配され、筒体と、この筒体の端部に配される底板と、から成り、γ線遮蔽機能を発揮する有底筒状の外容器と、
前記筒体に対して固定される底板支持部材とを備え、
前記底板は、前記筒体により形成される円柱空間の内側に配され、該筒体の内周に対して固定され、
前記底板支持部材は、環状に形成され、前記外容器の前記筒体よりも大径の外嵌部を有するとともに、前記底板支持部材は、前記外嵌部を前記筒体の端部に対して外嵌することで、前記端部に固定され、
前記底板は、前記筒体と前記底板支持部材とによって挟持されることで前記筒体の内周に対して固定される、
ことを特徴とする放射性物質の輸送兼貯蔵用容器 An inner container for containing radioactive material;
A bottomed cylindrical outer container that is disposed outside the inner container, and includes a cylindrical body and a bottom plate disposed at an end of the cylindrical body, and exhibits a γ-ray shielding function;
A bottom plate support member fixed to the cylinder,
The bottom plate is arranged inside a cylindrical space formed by the cylinder, and is fixed to the inner periphery of the cylinder ,
The bottom plate support member is formed in an annular shape and has an outer fitting portion having a diameter larger than that of the cylindrical body of the outer container, and the bottom plate support member has the outer fitting portion with respect to an end portion of the cylindrical body. By fitting externally, it is fixed to the end,
The bottom plate is fixed to the inner periphery of the cylinder by being sandwiched between the cylinder and the bottom plate support member.
A container for transporting and storing radioactive materials
前記底板は、前記筒体の前記端部の端面から離して配される、
ことを特徴とする放射性物質の輸送兼貯蔵用容器 In the container for transport and storage of radioactive material according to claim 1,
The bottom plate is disposed away from the end surface of the end of the cylindrical body,
A container for transporting and storing radioactive materials
前記底板支持部材は、前記筒体に対して焼きばめにより固定される、
ことを特徴とする放射性物質の輸送兼貯蔵用容器 In the container for transport and storage of radioactive material according to claim 1 or 2 ,
The bottom plate support member is fixed to the cylinder by shrink fitting.
A container for transporting and storing radioactive materials
前記外容器の筒体は前記内容器に対して焼ばめされる、
ことを特徴とする放射性物質の輸送兼貯蔵用容器 In the container for transport and storage of the radioactive substance according to any one of claims 1 to 3 ,
The cylinder of the outer container is shrink-fitted against the inner container;
A container for transporting and storing radioactive materials
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717500U (en) * | 1980-06-26 | 1982-01-29 | ||
| JPH0949898A (en) * | 1995-08-04 | 1997-02-18 | Kobe Steel Ltd | Container both for transporting and for storing radioactive materials |
| JP2002122695A (en) * | 2000-10-17 | 2002-04-26 | Ishikawajima Harima Heavy Ind Co Ltd | Vessel for disposal of high level radioactive waste |
| JP2005024514A (en) * | 2003-07-04 | 2005-01-27 | Kobe Steel Ltd | Transportation storage cask for radioactive material |
| JP2007064708A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Ltd | Canister for accommodating radioactive substances |
| JP2007240173A (en) * | 2006-03-06 | 2007-09-20 | Kobe Steel Ltd | Transportation/storage vessel of radioactive material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5717500A (en) * | 1980-06-30 | 1982-01-29 | Agency Of Ind Science & Technol | Manufacture of silicon nitride whisker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717500U (en) * | 1980-06-26 | 1982-01-29 | ||
| JPH0949898A (en) * | 1995-08-04 | 1997-02-18 | Kobe Steel Ltd | Container both for transporting and for storing radioactive materials |
| JP2002122695A (en) * | 2000-10-17 | 2002-04-26 | Ishikawajima Harima Heavy Ind Co Ltd | Vessel for disposal of high level radioactive waste |
| JP2005024514A (en) * | 2003-07-04 | 2005-01-27 | Kobe Steel Ltd | Transportation storage cask for radioactive material |
| JP2007064708A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Ltd | Canister for accommodating radioactive substances |
| JP2007240173A (en) * | 2006-03-06 | 2007-09-20 | Kobe Steel Ltd | Transportation/storage vessel of radioactive material |
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