JP2015017881A - Radioactive substance storage container - Google Patents

Radioactive substance storage container Download PDF

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JP2015017881A
JP2015017881A JP2013144945A JP2013144945A JP2015017881A JP 2015017881 A JP2015017881 A JP 2015017881A JP 2013144945 A JP2013144945 A JP 2013144945A JP 2013144945 A JP2013144945 A JP 2013144945A JP 2015017881 A JP2015017881 A JP 2015017881A
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storage container
radioactive substance
base material
substance storage
heat transfer
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JP6307228B2 (en
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健一郎 小谷
Kenichiro Kotani
健一郎 小谷
貴良 平山
Takayoshi Hirayama
貴良 平山
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Mitsubishi Heavy Industries Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

PROBLEM TO BE SOLVED: To maintain neutron shield performance and suppress increase in weight, and to facilitate an attachment of a heat-transfer fin.SOLUTION: A radioactive substance storage container 11 comprises: a barrel body 21 that is formed into a cylinder by having an opening part formed at one of the barrel body and having a closure part formed at the other thereof, and has a radioactive substance storage part inside the barrel body; a lid that is attachable/detachable with respect to the barrel body 21 so as to close the opening part; an outer cylinder 25 that is provided at an outer peripheral part of the barrel body 21, and stores a neutron shielding body; and a heat transfer fin 35 that is connected to the barrel body 21 and the outer cylinder 25 inside the outer cylinder 25. The heat transfer fin 35 is adapted to have a plate-like base material 35A made up of a metal material having high transfer properties, and bonding materials 35B composed of a metal material having affinity with respect to a metal material consisting of the barrel body 21 and the outer cylinder 25 and arranged only on both ends of the base material 35A, and each of the bonding materials 35B is welded to the barrel body 21 and the outer cylinder 25.

Description

本発明は、放射性廃棄物を収納し、輸送、貯蔵する放射性物質収納容器に関する。   The present invention relates to a radioactive substance storage container for storing, transporting and storing radioactive waste.

原子力発電プラントの原子炉などで発生した放射性廃棄物は、放射性物質収納容器に収納され、貯蔵施設や再処理施設などに搬送され、貯蔵または再処理される。このような放射性物質収納容器は、上部が開口した底付きの円筒形状をなす胴部と、複数の放射性廃棄物を個々に収納可能な複数のセルを有するバスケットと、胴部の上部に固定される蓋部とから構成されている。また、放射性物質収納容器は、胴部の外周に、胴部の外周面との間に密閉空間を形成するようにケーシングが配設されており、当該空間内に中性子遮蔽体が設けられている。また、ケーシングは、その内周面と胴部の外周面との間に伝熱フィンが設けられている。   Radioactive waste generated in a nuclear power plant nuclear reactor or the like is stored in a radioactive material storage container, transported to a storage facility or a reprocessing facility, and stored or reprocessed. Such a radioactive substance storage container is fixed to the upper part of the trunk part having a cylindrical shape with a bottom with an open top, a basket having a plurality of cells capable of individually accommodating a plurality of radioactive wastes. And a lid portion. Moreover, the radioactive substance storage container is provided with a casing on the outer periphery of the trunk so as to form a sealed space between the outer circumference of the trunk and the neutron shield in the space. . Further, the casing is provided with heat transfer fins between its inner peripheral surface and the outer peripheral surface of the body portion.

このような放射性物質収納容器について、胴部およびケーシングは、強度を確保するために炭素鋼により形成され、伝熱フィンは、熱伝導性を高めるため銅により形成される。そして、伝熱フィンは、胴部およびケーシングに対して溶接により接合される。この場合、伝熱フィンと、胴部およびケーシングとは異種金属であり、伝熱フィンの銅が炭素鋼である胴部およびケーシングに溶け込むと、この溶け込んだ部分が硬化してしまい、クラックが発生するおそれがある。このため、溶け込みをしないような特殊な溶接技術が必要である。   In such a radioactive substance storage container, the trunk and the casing are made of carbon steel in order to ensure strength, and the heat transfer fins are made of copper in order to increase the thermal conductivity. And a heat-transfer fin is joined with welding with respect to a trunk | drum and a casing. In this case, the heat transfer fin, the body, and the casing are dissimilar metals, and if the copper of the heat transfer fin melts into the body and the casing, which is carbon steel, the melted portion is cured and cracks are generated. There is a risk. For this reason, a special welding technique that does not melt is necessary.

そこで、従来の放射性物質収納容器として、例えば、特許文献１に記載された放射性物質用金属キャスクは、伝熱フィンが、２種類の金属板を互いに合わせて接合したクラッド材から構成され、一方の金属板は胴部およびケーシングと同種の金属材料で、他方の金属板は良伝熱金属材料で構成されており、胴部と同種の金属材料とが直接溶接されている。   Therefore, as a conventional radioactive substance storage container, for example, a metal cask for radioactive substance described in Patent Document 1 is composed of a clad material in which heat transfer fins are joined together by joining two kinds of metal plates. The metal plate is made of the same metal material as the body and the casing, and the other metal plate is made of a good heat transfer metal material. The body and the same kind of metal material are directly welded.

特開２００７−２０５９３１号公報JP 2007-205931 A

特許文献１に記載の放射性物質収納容器では、上述した溶け込みを防ぐことが可能である。しかし、２種類の金属板を互いに合わせて接合した伝熱フィンは、その板厚が厚くなるため、中性遮蔽体を設けるケーシング内の空間が縮小されるため、中性子遮蔽性能が低下することになり、かつ放射性物質収納容器の重量が増すことになる。   In the radioactive substance storage container described in Patent Document 1, it is possible to prevent the above-described melting. However, the heat transfer fin formed by joining two kinds of metal plates together is thickened, and the space in the casing in which the neutral shield is provided is reduced, so that the neutron shielding performance is reduced. And the weight of the radioactive substance storage container is increased.

本発明は上述した課題を解決するものであり、中性子遮蔽性能を維持するとともに重量の増加を抑制しつつ、伝熱フィンの取り付けを容易に行うことのできる放射性物質収納容器を提供することを目的とする。   An object of the present invention is to solve the above-described problems, and to provide a radioactive substance storage container capable of easily attaching a heat transfer fin while maintaining neutron shielding performance and suppressing an increase in weight. And

上記の目的を達成するための本発明の放射性物質収納容器は、一方に開口部が形成されて他方に閉塞部が形成されて筒形状をなし、その内部に放射性物質収納部を有する胴本体と、前記開口部を閉塞するように前記胴本体に対して着脱可能な蓋部と、前記胴本体の外周部に設けられて中性子遮蔽体を収容するケーシングと、前記ケーシング内で前記胴本体と前記ケーシングとに接合された伝熱フィンと、を備える放射性物質収納容器において、前記伝熱フィンは、伝熱性の高い金属材料からなる板状の母材と、前記胴本体および前記ケーシングをなす金属材料に対して親和性を有する金属材料からなり前記母材の両端部にのみ配置された接合材とを有して構成され、各前記接合材が前記胴本体および前記ケーシングに溶接されることを特徴とする。   In order to achieve the above object, the radioactive substance storage container of the present invention has a cylinder body having an opening formed on one side and a closed part formed on the other, and having a radioactive substance storage part therein. A lid part that can be attached to and detached from the trunk body so as to close the opening; a casing that is provided on an outer peripheral part of the trunk body and that contains a neutron shield; and the trunk body and the casing in the casing A radioactive substance storage container comprising a heat transfer fin joined to a casing, wherein the heat transfer fin includes a plate-like base material made of a metal material having high heat transfer, and a metal material forming the body and the casing. And a bonding material disposed only at both ends of the base material, and each of the bonding materials is welded to the trunk body and the casing. When That.

この放射性物質収納容器によれば、母材の端部にのみ、胴本体およびケーシングに対して親和性を有する金属材料からなる接合材が設けられ、この接合材が胴本体およびケーシングに溶接されているため、伝熱フィンの取り付けを容易に行うことができる。しかも、接合材は、母材の端部にのみ設けられているため、中性子遮蔽体を設けるケーシング内の空間が縮小される事態を抑えることができ、中性子遮蔽性能を維持することができる。しかも、接合材は、母材の端部にのみ設けられているため、伝熱フィンの重量の増加を抑制、延いては放射性物質収納容器の重量の増加を抑制することができる。   According to this radioactive substance storage container, a joining material made of a metal material having affinity for the trunk body and the casing is provided only at the end of the base material, and the joining material is welded to the trunk body and the casing. Therefore, the heat transfer fin can be easily attached. And since the joining material is provided only in the edge part of a base material, the situation where the space in the casing which provides a neutron shield can be reduced can be suppressed, and neutron shielding performance can be maintained. And since the joining material is provided only in the edge part of a base material, the increase in the weight of a heat-transfer fin can be suppressed and by extension, the increase in the weight of a radioactive substance storage container can be suppressed.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材の板厚の範囲に前記接合材が設けられていることを特徴とする。   In the radioactive substance storage container of the present invention, the heat transfer fin is provided with the bonding material in a range of the thickness of the base material.

この放射性物質収納容器によれば、母材の板厚の範囲に接合材を設けることで、伝熱フィン全体の板厚が母材の板厚の範囲となることから、中性子遮蔽体を設けるケーシング内の空間が縮小される事態を抑え、中性子遮蔽性能を維持する効果を顕著に得ることができる。   According to this radioactive substance storage container, by providing the joining material in the range of the thickness of the base material, the thickness of the entire heat transfer fin becomes the range of the thickness of the base material. The effect of maintaining the neutron shielding performance can be obtained remarkably by suppressing the situation where the inner space is reduced.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材と前記接合材とが、前記母材の板厚に対して傾斜する傾斜面を互いに突き合わせて設けられていることを特徴とする。   Further, in the radioactive substance storage container of the present invention, the heat transfer fin is provided such that the base material and the bonding material face each other with inclined surfaces inclined with respect to the thickness of the base material. Features.

この放射性物質収納容器によれば、母材と接合材とを、母材の板厚に対して傾斜する傾斜面を互いに突き合わせて設けることで、母材と接合材との相互の接触面積が比較的大きくなるため、熱抵抗を小さくし、放熱性能を維持することができる。   According to this radioactive substance storage container, the contact surfaces of the base material and the bonding material are compared by providing the base material and the bonding material with the inclined surfaces that are inclined with respect to the thickness of the base material. Therefore, the thermal resistance can be reduced and the heat dissipation performance can be maintained.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材と前記接合材とが、凹凸を互いに嵌め合わせて設けられていることを特徴とする。   Moreover, in the radioactive substance storage container of the present invention, the heat transfer fin is characterized in that the base material and the bonding material are provided with recesses and projections fitted to each other.

この放射性物質収納容器によれば、母材と接合材とを、凹凸を互いに嵌め合わせて設けることで、母材と接合材との相互の接触面積が比較的大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。   According to this radioactive substance storage container, the contact area between the base material and the joining material is relatively large by providing the base material and the joining material by fitting the concaves and convexes with each other. The heat dissipation performance can be maintained.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材の端部を覆うように前記接合材が設けられていることを特徴とする。   In the radioactive substance storage container of the present invention, the heat transfer fin is provided with the bonding material so as to cover an end portion of the base material.

この放射性物質収納容器によれば、母材の端部を覆うように接合材が設けられることで、母材と接合材との相互の接触面積が比較的大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。   According to this radioactive substance storage container, since the mutual contact area between the base material and the joining material is relatively large by providing the joining material so as to cover the end of the base material, the temperature difference of the heat conduction is reduced. It can be made smaller and heat dissipation performance can be maintained.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材の端部の側面に沿って前記接合材が設けられていることを特徴とする。   In the radioactive substance storage container of the present invention, the heat transfer fin is provided with the bonding material along a side surface of an end portion of the base material.

この放射性物質収納容器によれば、母材の端部の側面に沿って接合材が設けられることで、母材と接合材との相互の接触面積が比較的大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。   According to this radioactive substance storage container, since the mutual contact area between the base material and the joining material becomes relatively large by providing the joining material along the side surface of the end portion of the base material, the temperature difference in heat conduction The heat dissipation performance can be maintained.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材の端部が屈曲形成され、前記接合材が前記屈曲に沿って設けられていることを特徴とする。   In the radioactive substance storage container of the present invention, the heat transfer fin is formed such that an end portion of the base material is bent and the bonding material is provided along the bend.

この放射性物質収納容器によれば、母材の端部の屈曲に沿って接合材が設けられることで、母材と接合材との相互の接触面積が比較的大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。しかも、母材の端部を屈曲形成することで、伝熱フィンの剛性を高め、延いては放射性物質収納容器の剛性を高めることができる。   According to this radioactive substance storage container, since the mutual contact area between the base material and the joining material becomes relatively large by providing the joining material along the bending of the end portion of the base material, the temperature difference of the heat conduction The heat dissipation performance can be maintained. In addition, by bending the end portion of the base material, the rigidity of the heat transfer fin can be increased, and as a result, the rigidity of the radioactive substance storage container can be increased.

また、本発明の放射性物質収納容器では、前記伝熱フィンは、前記母材と前記接合材とが、双方に親和性を有する金属材料を介して接合されていることを特徴とする。   In the radioactive substance storage container of the present invention, the heat transfer fin is characterized in that the base material and the bonding material are bonded to each other via a metal material having affinity for both.

この放射性物質収納容器によれば、母材と接合材との接合をし易くなり、かつ接合強度を向上することができる。   According to this radioactive substance storage container, it becomes easy to join the base material and the joining material, and the joining strength can be improved.

本発明によれば、中性子遮蔽性能を維持するとともに重量の増加を抑制しつつ、伝熱フィンの取り付けを容易に行うことができる。   According to the present invention, it is possible to easily attach a heat transfer fin while maintaining neutron shielding performance and suppressing an increase in weight.

図１は、本発明の実施形態に係る放射性物質収納容器としてのキャスクの側断面図である。FIG. 1 is a side sectional view of a cask as a radioactive substance storage container according to an embodiment of the present invention. 図２は、本発明の実施形態に係る放射性物質収納容器としてのキャスクの平断面図である。FIG. 2 is a plan sectional view of a cask as a radioactive substance storage container according to an embodiment of the present invention. 図３は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図４は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 4 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図５は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図６は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 6 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図７は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 7 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図８は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 8 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図９は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 9 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図１０は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 10 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図１１は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 11 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention. 図１２は、本発明の実施形態に係る放射性物質収納容器における要部の拡大断面図である。FIG. 12 is an enlarged cross-sectional view of a main part of the radioactive substance storage container according to the embodiment of the present invention.

以下に、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、この実施形態によりこの発明が限定されるものではない。また、下記実施形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

図１は、本実施形態に係る放射性物質収納容器としてのキャスクの側断面図であり、図２は、本実施形態に係る放射性物質収納容器としてのキャスクの平断面図である。   FIG. 1 is a side sectional view of a cask as a radioactive substance storage container according to this embodiment, and FIG. 2 is a plan sectional view of a cask as a radioactive substance storage container according to this embodiment.

放射性物質収納容器としてのキャスク１１は、胴部１２と蓋部１３とバスケット１４とから構成されている。胴部１２は、胴本体２１の一方、つまり、上部に開口部２２が形成され、他方、つまり、下部に底部（閉塞部）２３が形成された円筒形状をなしており、内部に放射性物質（例えば、使用済燃料集合体）を収納可能となっている。すなわち、胴本体２１は、内部にキャビティ２４が設けられ、このキャビティ２４は、その内面がバスケット１４の外周形状に合わせた形状となっている。バスケット１４は、複数の放射性物質（図示略）を個々に収納するセル１４Ａを複数有して放射性物質収納部を構成している。そして、胴本体２１は、下部に底部２３が溶接により結合または一体成形されており、この胴本体２１および底部２３は、γ線遮蔽機能を有する炭素鋼製の鍛造品となっている。胴本体２１および底部２３は、炭素鋼の代わりにステンレス鋼を用いることもできる。また、胴本体２１および底部２３は、球状黒鉛鋳鉄や炭素鋼鋳鋼などの鋳造品を用いることもできる。   A cask 11 as a radioactive substance storage container includes a body portion 12, a lid portion 13, and a basket 14. The trunk portion 12 has a cylindrical shape in which an opening 22 is formed on one side of the trunk body 21, that is, an upper portion, and the bottom portion (blocking portion) 23 is formed on the other side, that is, a lower portion. For example, a spent fuel assembly) can be stored. That is, the trunk body 21 is provided with a cavity 24 inside, and the cavity 24 has a shape matching the outer peripheral shape of the basket 14. The basket 14 includes a plurality of cells 14 </ b> A that individually store a plurality of radioactive substances (not shown) to form a radioactive substance storage unit. And the bottom part 23 of the trunk | drum main body 21 is couple | bonded or integrally molded by welding, and this trunk | drum main body 21 and the bottom part 23 are forged products made from carbon steel which has a gamma ray shielding function. Stainless steel can also be used for the trunk | drum main body 21 and the bottom part 23 instead of carbon steel. The trunk body 21 and the bottom portion 23 can also be made of cast products such as spheroidal graphite cast iron and carbon steel cast steel.

胴部１２は、胴本体２１の外周側に所定の隙間を空けてケーシングとしての炭素鋼製の外筒２５が配設されている。そして、胴本体２１の外周面と外筒２５の内周面との間に、熱伝導を行う銅製の伝熱フィン３５が周方向に等間隔で複数溶接されている。そして、胴部１２は、胴本体２１と外筒２５との空間部に、水素を多く含有する高分子材料であって中性子遮蔽機能を有するボロンまたはボロン化合物を含有したレジン（中性子遮蔽体）２６が流動状態で図示しないパイプなどを介して注入され、固化されている。   The body portion 12 is provided with a carbon steel outer cylinder 25 as a casing with a predetermined gap provided on the outer peripheral side of the body body 21. A plurality of copper heat transfer fins 35 that conduct heat are welded at equal intervals in the circumferential direction between the outer peripheral surface of the trunk body 21 and the inner peripheral surface of the outer cylinder 25. The body 12 is a resin (neutron shielding body) 26 containing boron or a boron compound which is a polymer material containing a large amount of hydrogen and has a neutron shielding function in the space between the body body 21 and the outer cylinder 25. Is injected and solidified through a pipe (not shown) in a fluidized state.

ここで、伝熱フィン３５は、円筒形状の胴本体２１における放射方向（半径方向）に対し、傾斜して設けられている。中性子は、胴本体２１の放射方向に放出され、これと同方向に沿って伝熱フィン３５を胴本体２１の放射方向に配置した場合、当該伝熱フィン３５を配置した放射方向にレジン２６が存在していないため、レジン２６による中性子遮蔽性能が十分に機能しないおそれがある。このため、伝熱フィン３５を胴本体２１の放射方向に対して傾斜して設けることで、レジン２６で胴本体２１の周囲を漏れなく囲み、中性子遮蔽性能を十分に機能させることができる。   Here, the heat transfer fins 35 are provided so as to be inclined with respect to the radial direction (radial direction) in the cylindrical body 21. Neutrons are emitted in the radial direction of the trunk body 21, and when the heat transfer fins 35 are arranged in the radial direction of the trunk body 21 along the same direction, the resin 26 is disposed in the radial direction in which the heat transfer fins 35 are arranged. Since it does not exist, the neutron shielding performance by the resin 26 may not function sufficiently. For this reason, by providing the heat transfer fins 35 so as to be inclined with respect to the radial direction of the trunk main body 21, the resin 26 can surround the trunk main body 21 without leakage, and the neutron shielding performance can sufficiently function.

また、胴部１２は、底部２３の下側に複数の連結板２７により所定の隙間を空けて底板２８が連結されていてもよく、この連結板２７と底板２８との空間部にレジン（中性子遮蔽体）２９が設けられている。更に、胴部１２は、外周部における所定の位置にトラニオン３０が固定されている。なお、連結板２７を設けないこともある。   The body 12 may have a bottom plate 28 connected to the lower side of the bottom 23 with a plurality of connecting plates 27 with a predetermined gap, and a resin (neutron) in a space between the connecting plate 27 and the bottom plate 28. A shield) 29 is provided. Furthermore, the trunnion 30 is fixed to the trunk | drum 12 in the predetermined position in an outer peripheral part. The connecting plate 27 may not be provided.

胴部１２における胴本体２１の開口部２２を閉塞する蓋部１３は、一次蓋部３１と二次蓋部３２によって構成されている。一次蓋部３１は、γ線を遮蔽するステンレス鋼または炭素鋼からなる円盤形状である。また、二次蓋部３２も、ステンレス鋼製または炭素鋼製の円盤形状であるが、その内部にレジン（中性子遮蔽体）３３が封入されている。この一次蓋部３１および二次蓋部３２は、ステンレス鋼製または炭素鋼製のボルト（図示略）により胴本体２１の上端部に着脱自在に取付けられている。この場合、一次蓋部３１および二次蓋部３２と胴本体２１との間に、それぞれ図示しない金属ガスケットが介装され、内部の密封性を確保している。なお、レジン３３は、一次蓋部３１に設けられていてもよく、一次蓋部３１にのみ設けられていてもよい。また、蓋部１３の周囲には、レジンを封入した補助遮蔽体３４が設けられる場合もある。   The lid 13 that closes the opening 22 of the trunk body 21 in the trunk 12 includes a primary lid 31 and a secondary lid 32. The primary lid portion 31 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid portion 32 is also formed of a stainless steel or carbon steel disk, and a resin (neutron shield) 33 is enclosed therein. The primary lid portion 31 and the secondary lid portion 32 are detachably attached to the upper end portion of the trunk body 21 with stainless steel or carbon steel bolts (not shown). In this case, metal gaskets (not shown) are interposed between the primary lid portion 31 and the secondary lid portion 32 and the trunk body 21 to ensure the internal sealing performance. The resin 33 may be provided on the primary lid 31 or may be provided only on the primary lid 31. In addition, an auxiliary shield 34 enclosing a resin may be provided around the lid portion 13.

図３〜図１２は、本実施形態に係る放射性物質収納容器における要部の拡大断面図である。図３〜図１２は、本実施形態に係る放射性物質収納容器における要部として、上述した伝熱フィン３５を拡大して示している。なお、図３〜図１２に示す胴本体２１、外筒２５と伝熱フィン３５との溶接を鋭角側で行う例を図示しているが、鈍角側にて溶接しても良い。   3-12 is an expanded sectional view of the principal part in the radioactive substance storage container which concerns on this embodiment. 3-12 has expanded and shown the heat-transfer fin 35 mentioned above as a principal part in the radioactive substance storage container which concerns on this embodiment. In addition, although the example which welds the trunk | drum main body 21, the outer cylinder 25, and the heat-transfer fin 35 which are shown in FIGS. 3-12 on an acute angle side is shown in figure, you may weld on an obtuse angle side.

本実施形態において、伝熱フィン３５は、伝熱性の高い金属材料（銅）からなる母材３５Ａと、胴本体２１および外筒２５の金属材料（炭素鋼）に対し、溶接の溶け込みによる硬化が生じ難い親和性を有する金属材料（鉄やニッケルなど）からなる接合材３５Ｂとを有している。そして、母材３５Ａにおいて、胴本体２１および外筒２５に向く両端部にのみ、接合材３５Ｂが配置され、この接合材３５Ｂが胴本体２１および外筒（ケーシング）２５に溶接されている。   In the present embodiment, the heat transfer fin 35 is hardened by melting of the base material 35A made of a highly heat conductive metal material (copper) and the metal material (carbon steel) of the trunk body 21 and the outer cylinder 25. And a bonding material 35B made of a metal material (such as iron or nickel) having an affinity that is unlikely to occur. In the base material 35 </ b> A, the bonding material 35 </ b> B is disposed only at both ends facing the trunk body 21 and the outer cylinder 25, and the bonding material 35 </ b> B is welded to the trunk body 21 and the outer cylinder (casing) 25.

このように構成された伝熱フィン３５を備える本実施形態の放射性物質収納容器（キャスク１１）によれば、母材３５Ａの端部にのみ、胴本体２１および外筒２５に対して親和性を有する金属材料からなる接合材３５Ｂが設けられ、この接合材３５Ｂが胴本体２１および外筒２５に溶接されているため、伝熱フィン３５の取り付けを容易に行うことができる。しかも、接合材３５Ｂは、母材３５Ａの端部にのみ設けられているため、中性子遮蔽体であるレジン２６を設ける外筒２５内の空間が縮小される事態を抑えることができ、中性子遮蔽性能を維持することができる。しかも、接合材３５Ｂは、母材３５Ａの端部にのみ設けられているため、伝熱フィン３５の重量の増加を抑制、延いてはキャスク１１の重量の増加を抑制することができる。   According to the radioactive substance storage container (cask 11) of the present embodiment including the heat transfer fins 35 configured in this way, only the end portion of the base material 35A has affinity for the trunk body 21 and the outer cylinder 25. Since the joining material 35 </ b> B made of the metal material is provided and this joining material 35 </ b> B is welded to the trunk body 21 and the outer cylinder 25, the heat transfer fins 35 can be easily attached. In addition, since the bonding material 35B is provided only at the end of the base material 35A, the situation in which the space in the outer cylinder 25 provided with the resin 26, which is a neutron shielding body, is reduced can be suppressed, and the neutron shielding performance. Can be maintained. In addition, since the bonding material 35B is provided only at the end portion of the base material 35A, it is possible to suppress an increase in the weight of the heat transfer fins 35 and, in turn, an increase in the weight of the cask 11.

なお、接合材３５Ｂは、銅製の母材３５Ａに対して伝熱性が低い金属材料であり、熱伝導の温度差が生じることが懸念される。例えば、図３に示すように、母材３５Ａと接合材３５Ｂとが、母材３５Ａの板厚分の断面で接合されている構成において、母材３５Ａの板厚に対して、接合材３５Ｂの幅寸法（胴本体２１の径方向に沿う方向の寸法）を２倍程度にした場合、接合材３５Ｂを設けない構成と比較した温度差は、計算上数℃程度であり、伝熱フィン３５の放熱性能に有意な影響は生じない。なお、上記熱伝導の温度差の例として、伝熱フィン３５を母材３５Ａのみとした銅１００％と比較すると、図３に示す形態において、鋼で形成した接合部材３５Ｂの割合を母材３５Ａの１６％とした場合は約７℃の温度差であり、伝熱フィン３５の放熱性能に有意な影響は生じない。また、比較例として、鋼で形成した接合部材３５Ｂの割合を母材３５Ａの５０％とした場合は約１９℃の温度差であり、伝熱フィン３５を接合部材３５Ｂのみとした鋼１００％の場合は３４℃の温度差である。   Note that the bonding material 35B is a metal material having low heat conductivity with respect to the copper base material 35A, and there is a concern that a temperature difference in heat conduction occurs. For example, as shown in FIG. 3, in the configuration in which the base material 35A and the joining material 35B are joined with a cross section corresponding to the thickness of the base material 35A, the joining material 35B has a thickness of the base material 35A. When the width dimension (dimension in the direction along the radial direction of the trunk body 21) is about doubled, the temperature difference compared with the configuration in which the bonding material 35B is not provided is about several degrees Celsius in calculation, and the heat transfer fin 35 There is no significant effect on heat dissipation performance. In addition, as an example of the temperature difference of the heat conduction, when compared with copper 100% in which the heat transfer fins 35 are only the base material 35A, in the form shown in FIG. 16%, the temperature difference is about 7 ° C., and there is no significant effect on the heat dissipation performance of the heat transfer fins 35. Further, as a comparative example, when the ratio of the joining member 35B formed of steel is 50% of the base material 35A, the temperature difference is about 19 ° C., and the heat transfer fin 35 is only the joining member 35B. In this case, the temperature difference is 34 ° C.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図３〜図６に示すように、伝熱フィン３５は、母材３５Ａの板厚の範囲に接合材３５Ｂが設けられていることが好ましい。このような、図３〜図６に示す伝熱フィン３５は、母材３５Ａと接合材３５Ｂとの接合を、溶接、拡散接合（圧延）により実施することができる。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIGS. 3-6, as for the heat-transfer fin 35, the joining material 35B is provided in the range of the plate | board thickness of the base material 35A. Is preferred. Such heat transfer fins 35 shown in FIGS. 3 to 6 can perform the joining of the base material 35A and the joining material 35B by welding or diffusion joining (rolling).

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａの板厚の範囲に接合材３５Ｂを設けることで、伝熱フィン３５全体の板厚が母材３５Ａの板厚の範囲となることから、中性子遮蔽体であるレジン２６を設ける外筒２５内の空間が縮小される事態を抑え、中性子遮蔽性能を維持する効果を顕著に得ることができる。   According to this radioactive substance storage container (cask 11), by providing the bonding material 35B in the range of the thickness of the base material 35A, the thickness of the entire heat transfer fin 35 becomes the range of the thickness of the base material 35A. Therefore, the situation in which the space in the outer cylinder 25 provided with the resin 26 that is a neutron shield is reduced can be suppressed, and the effect of maintaining the neutron shielding performance can be significantly obtained.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図４に示すように、伝熱フィン３５は、母材３５Ａと接合材３５Ｂとが、母材３５Ａの板厚に対して傾斜する傾斜面３５ａを互いに突き合わせて設けられていることが好ましい。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG. 4, as for the heat-transfer fin 35, 35 A of base materials and the bonding material 35B incline with respect to the plate | board thickness of 35 A of base materials. It is preferable that the inclined surfaces 35a are provided to face each other.

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａと接合材３５Ｂとを、母材３５Ａの板厚に対して傾斜する傾斜面３５ａを互いに突き合わせて設けることで、図３に示す伝熱フィン３５と比較して、母材３５Ａと接合材３５Ｂとの相互の接触面積が大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。   According to the radioactive substance storage container (cask 11), the base material 35A and the bonding material 35B are provided so that the inclined surfaces 35a that are inclined with respect to the plate thickness of the base material 35A face each other, so that the transmission shown in FIG. Compared to the heat fins 35, the mutual contact area between the base material 35A and the bonding material 35B is increased, so that the temperature difference in heat conduction can be reduced and heat dissipation performance can be maintained.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図５および図６に示すように、伝熱フィン３５は、母材３５Ａと接合材３５Ｂとが、凹凸３５ｂを互いに嵌め合わせて設けられていることが好ましい。なお、図６において凹凸３５ｂの形状は、母材３５Ａが凸形状で接合材３５Ｂが凹形状であるが、母材３５Ａと接合材３５Ｂとで凸形状と凹形状が逆に形成されていてもよい。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG.5 and FIG.6, as for the heat-transfer fin 35, the base material 35A and the bonding | jointing material 35B are provided so that the unevenness | corrugation 35b may mutually fit. It is preferable that In FIG. 6, the shape of the unevenness 35b is such that the base material 35A has a convex shape and the bonding material 35B has a concave shape, but the base material 35A and the bonding material 35B may be formed with the convex shape and the concave shape reversed. Good.

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａと接合材３５Ｂとを、凹凸３５ｂを互いに嵌め合わせて設けることで、図３に示す伝熱フィン３５と比較して、母材３５Ａと接合材３５Ｂとの相互の接触面積が大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。   According to the radioactive substance storage container (cask 11), the base material 35A and the bonding material 35B are provided by fitting the unevenness 35b to each other, so that the base material 35A is compared with the heat transfer fin 35 shown in FIG. And the bonding material 35B increase in mutual contact area, so that the temperature difference in heat conduction can be reduced and heat dissipation performance can be maintained.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図７および図８に示すように、伝熱フィン３５は、母材３５Ａの端部を覆うように接合材３５Ｂが設けられていることが好ましい。図７では、母材３５Ａの端部が角形状に形成され、角形状を覆う凹部３５ｃが矩形断面の接合材３５Ｂに形成されている。図８では、母材３５Ａの端部が角形状に形成され、角形状を覆う凹部３５ｃが三角形断面の接合材３５Ｂに形成されている。このような、図７および図８に示す伝熱フィン３５は、母材３５Ａと接合材３５Ｂとの接合を、溶接、拡散接合（圧延）により実施することができる。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG.7 and FIG.8, as for the heat-transfer fin 35, the joining material 35B is provided so that the edge part of 35 A of base materials may be covered. It is preferable. In FIG. 7, the end portion of the base material 35A is formed in a square shape, and a concave portion 35c covering the square shape is formed in the bonding material 35B having a rectangular cross section. In FIG. 8, the end portion of the base material 35A is formed in a square shape, and the concave portion 35c covering the square shape is formed in the bonding material 35B having a triangular cross section. Such heat transfer fins 35 shown in FIG. 7 and FIG. 8 can perform the joining of the base material 35A and the joining material 35B by welding or diffusion joining (rolling).

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａの端部を覆うように接合材３５Ｂが設けられることで、図３に示す伝熱フィン３５と比較して、母材３５Ａと接合材３５Ｂとの相互の接触面積が大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。しかも、図３に示す伝熱フィン３５と比較して、接合材３５Ｂの質量を小さくできるため、重量の増加を抑制する効果を顕著に得ることができる。   According to the radioactive substance storage container (cask 11), the bonding material 35B is provided so as to cover the end of the parent material 35A, so that the bonding of the parent material 35A to the heat transfer fin 35 shown in FIG. Since the mutual contact area with the material 35B is increased, the temperature difference in heat conduction can be reduced and the heat dissipation performance can be maintained. And since the mass of the joining material 35B can be made small compared with the heat transfer fin 35 shown in FIG. 3, the effect which suppresses the increase in a weight can be acquired notably.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図９に示すように、伝熱フィン３５は、母材３５Ａの端部の側面に沿って接合材３５Ｂが設けられていることが好ましい。このような、図９に示す伝熱フィン３５は、母材３５Ａと接合材３５Ｂとの接合を、溶接、拡散接合（圧延）、爆着により実施することができる。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG. 9, as for the heat-transfer fin 35, it is that the joining material 35B is provided along the side surface of the edge part of 35 A of base materials. preferable. Such a heat transfer fin 35 shown in FIG. 9 can perform the joining of the base material 35A and the joining material 35B by welding, diffusion joining (rolling), or explosive bonding.

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａの端部の側面に沿って接合材３５Ｂが設けられることで、図３に示す伝熱フィン３５と比較して、母材３５Ａと接合材３５Ｂとの相互の接触面積が大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。しかも、図３に示す伝熱フィン３５と比較して、接合材３５Ｂの質量を小さくできるため、重量の増加を抑制する効果を顕著に得ることができる。   According to the radioactive substance storage container (cask 11), the bonding material 35B is provided along the side surface of the end portion of the base material 35A, so that the base material 35A and the heat transfer fin 35 shown in FIG. Since the mutual contact area with the bonding material 35B is increased, the temperature difference in heat conduction can be reduced and heat dissipation performance can be maintained. And since the mass of the joining material 35B can be made small compared with the heat transfer fin 35 shown in FIG. 3, the effect which suppresses the increase in a weight can be acquired notably.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図１０に示すように、伝熱フィン３５は、母材３５Ａの端部が屈曲形成され、接合材３５Ｂが屈曲に沿って設けられていることが好ましい。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG. 10, as for the heat-transfer fin 35, the edge part of base material 35A is bent and the bonding material 35B is provided along bending. It is preferable.

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａの端部の屈曲に沿って接合材３５Ｂが設けられることで、図３に示す伝熱フィン３５と比較して、母材３５Ａと接合材３５Ｂとの相互の接触面積が大きくなるため、熱伝導の温度差を小さくし、放熱性能を維持することができる。しかも、母材３５Ａの端部を屈曲形成することで、伝熱フィン３５の剛性を高め、延いてはキャスク１１の剛性を高めることができる。   According to the radioactive substance storage container (cask 11), the bonding material 35B is provided along the bending of the end of the parent material 35A, so that the parent material 35A and the heat transfer fin 35 shown in FIG. Since the mutual contact area with the bonding material 35B is increased, the temperature difference in heat conduction can be reduced and heat dissipation performance can be maintained. In addition, by bending the end portion of the base material 35A, the rigidity of the heat transfer fins 35 can be increased, and thus the rigidity of the cask 11 can be increased.

また、本実施形態の放射性物質収納容器（キャスク１１）では、図１１および図１２に示すように、伝熱フィン３５は、母材３５Ａと接合材３５Ｂとが、双方に溶接の溶け込みによる硬化が生じ難い親和性を有する金属材料（ニッケルなど）３５Ｃを介して接合されていることが好ましい。図１１は、母材３５Ａと接合材３５Ｂとを、金属材料３５Ｃを介して拡散接合（圧延）により接合した例を示している。また、図１２は、母材３５Ａと接合材３５Ｂとを、金属材料３５Ｃを介して溶接した例を示している。この図１１および図１２に示す接合は、図３〜図１０に示す構成に適用することができる。   Moreover, in the radioactive substance storage container (cask 11) of this embodiment, as shown in FIG.11 and FIG.12, as for the heat-transfer fin 35, the base material 35A and the bonding | jointing material 35B are hardened by both welding melt | dissolution. It is preferable to join via metal material (nickel etc.) 35C which has the affinity which is hard to produce. FIG. 11 shows an example in which the base material 35A and the bonding material 35B are bonded by diffusion bonding (rolling) through the metal material 35C. FIG. 12 shows an example in which the base material 35A and the bonding material 35B are welded via the metal material 35C. The joining shown in FIGS. 11 and 12 can be applied to the configurations shown in FIGS.

この放射性物質収納容器（キャスク１１）によれば、母材３５Ａと接合材３５Ｂとの接合をし易くなり、かつ接合強度を向上することができる。   According to this radioactive substance storage container (cask 11), it becomes easy to join the base material 35A and the joining material 35B, and the joining strength can be improved.

１１ キャスク（放射性物質収納容器）
１２ 胴部
１３ 蓋部
１４ バスケット（放射性物質収納部）
２１ 胴本体
２２ 開口部
２３ 底部（閉塞部）
２５ 外筒（ケーシング）
２６ レジン（中性子遮蔽体）
３５ 伝熱フィン
３５Ａ 母材
３５Ｂ 接合材
３５Ｃ 金属材料
３５ａ 傾斜面
３５ｂ 凹凸
３５ｃ 凹部 11 Cask (radioactive substance storage container)
12 body part 13 lid part 14 basket (radioactive substance storage part)
21 body 22 opening 23 bottom (blocking part)
25 Outer cylinder (casing)
26 Resin (neutron shield)
35 heat transfer fin 35A base material 35B bonding material 35C metal material 35a inclined surface 35b uneven surface 35c recessed portion

Claims (8)

一方に開口部が形成されて他方に閉塞部が形成されて筒形状をなし、その内部に放射性物質収納部を有する胴本体と、
前記開口部を閉塞するように前記胴本体に対して着脱可能な蓋部と、
前記胴本体の外周部に設けられて中性子遮蔽体を収容するケーシングと、
前記ケーシング内で前記胴本体と前記ケーシングとに接合された伝熱フィンと、
を備える放射性物質収納容器において、
前記伝熱フィンは、伝熱性の高い金属材料からなる板状の母材と、前記胴本体および前記ケーシングをなす金属材料に対して親和性を有する金属材料からなり前記母材の両端部にのみ配置された接合材とを有して構成され、各前記接合材が前記胴本体および前記ケーシングに溶接されることを特徴とする放射性物質収納容器。 An opening is formed on one side and a blocking part is formed on the other to form a cylinder shape, and a trunk body having a radioactive substance storage part inside thereof,
A lid that can be attached to and detached from the trunk body so as to close the opening;
A casing that is provided on the outer periphery of the trunk body and houses a neutron shield;
A heat transfer fin joined to the body and the casing in the casing;
In a radioactive substance storage container comprising:
The heat transfer fin is composed of a plate-shaped base material made of a metal material having a high heat transfer property and a metal material having an affinity for the metal material forming the body and the casing, and only at both ends of the base material. A radioactive substance storage container comprising: a bonding material disposed; and each of the bonding materials is welded to the trunk body and the casing. 前記伝熱フィンは、前記母材の板厚の範囲に前記接合材が設けられていることを特徴とする請求項１に記載の放射性物質収納容器。   The radioactive substance storage container according to claim 1, wherein the heat transfer fin is provided with the bonding material in a range of the thickness of the base material. 前記伝熱フィンは、前記母材と前記接合材とが、前記母材の板厚に対して傾斜する傾斜面を互いに突き合わせて設けられていることを特徴とする請求項２に記載の放射性物質収納容器。   The radioactive substance according to claim 2, wherein the heat transfer fin is provided such that the base material and the bonding material face each other with inclined surfaces inclined with respect to a thickness of the base material. Storage container. 前記伝熱フィンは、前記母材と前記接合材とが、凹凸を互いに嵌め合わせて設けられていることを特徴とする請求項２に記載の放射性物質収納容器。   The radioactive heat storage container according to claim 2, wherein the heat transfer fin is provided such that the base material and the bonding material are fitted with unevenness. 前記伝熱フィンは、前記母材の端部を覆うように前記接合材が設けられていることを特徴とする請求項１に記載の放射性物質収納容器。   The radioactive substance storage container according to claim 1, wherein the heat transfer fin is provided with the bonding material so as to cover an end portion of the base material. 前記伝熱フィンは、前記母材の端部の側面に沿って前記接合材が設けられていることを特徴とする請求項１に記載の放射性物質収納容器。   The radioactive substance storage container according to claim 1, wherein the heat transfer fin is provided with the bonding material along a side surface of an end portion of the base material. 前記伝熱フィンは、前記母材の端部が屈曲形成され、前記接合材が前記屈曲に沿って設けられていることを特徴とする請求項１に記載の放射性物質収納容器。   2. The radioactive substance storage container according to claim 1, wherein an end portion of the base material is bent and the bonding material is provided along the bend. 前記伝熱フィンは、前記母材と前記接合材とが、双方に親和性を有する金属材料を介して接合されていることを特徴とする請求項１〜７のいずれか一つに記載の放射性物質収納容器。   The radiation according to any one of claims 1 to 7, wherein the heat transfer fin is formed by bonding the base material and the bonding material via a metal material having affinity for both. Substance storage container.
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