JP2022011603A - Radioactive material storage container protection device, and radioactive material storage container - Google Patents

Radioactive material storage container protection device, and radioactive material storage container Download PDF

Info

Publication number
JP2022011603A
JP2022011603A JP2020112846A JP2020112846A JP2022011603A JP 2022011603 A JP2022011603 A JP 2022011603A JP 2020112846 A JP2020112846 A JP 2020112846A JP 2020112846 A JP2020112846 A JP 2020112846A JP 2022011603 A JP2022011603 A JP 2022011603A
Authority
JP
Japan
Prior art keywords
cushioning
cushioning material
protective device
deterioration monitoring
monitoring member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2020112846A
Other languages
Japanese (ja)
Other versions
JP7336420B2 (en
Inventor
秀晃 三井
Hideaki Mitsui
雄一 齋藤
Yuichi Saito
大一 石生
Daiichi Ishibu
慶行 斎藤
Noriyuki Saito
耕作 西
Kosaku Nishi
貴大 野末
Takahiro Nozue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP2020112846A priority Critical patent/JP7336420B2/en
Publication of JP2022011603A publication Critical patent/JP2022011603A/en
Application granted granted Critical
Publication of JP7336420B2 publication Critical patent/JP7336420B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Landscapes

  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

To allow for checking soundness of a buffer material while being stored.SOLUTION: A protection device for protecting a cask 11 comprising a body portion 12 and a lid portion 13 for sealing the body portion 12 is provided, the protection device comprising a buffer body 1 disposed at least on the outer side of the lid portion 13 in a radial direction and provided with a buffer material 3 configured to absorb shock by deforming, and deterioration monitoring members 4 made of a material having an aging property similar to that of the buffer material 3 and disposed around the cask 11.SELECTED DRAWING: Figure 3

Description

本発明は、放射性物質収納容器の保護装置および放射性物質収納容器に関する。 The present invention relates to a protective device for a radioactive material storage container and a radioactive material storage container.

例えば、特許文献1に記載のキャスク(放射性物質収納容器)用緩衝構造体は、キャスクの両端部に装着するもので、端部に装着される底板と、底板を周方向に複数に分割するリブと、リブを覆って底板の反対側に内部空間を形成するカバーと、内部空間に充填される緩衝材と、を有する。 For example, the cushioning structure for a cask (radioactive material storage container) described in Patent Document 1 is attached to both ends of the cask, and has a bottom plate attached to the ends and a rib that divides the bottom plate into a plurality of parts in the circumferential direction. It has a cover that covers the ribs and forms an internal space on the opposite side of the bottom plate, and a cushioning material that fills the internal space.

特開2009-186427号公報Japanese Unexamined Patent Publication No. 2009-186427

放射性物質収納容器は、輸送後、数十年の間、貯蔵場所にて保管される。このような場合、緩衝体は、保管中に経年劣化する可能性のある緩衝材の健全性を確保し、必要に応じて取り換えできるようにすることが望まれている。 The radioactive material storage container is stored in the storage place for several decades after transportation. In such a case, it is desired that the cushioning material ensures the soundness of the cushioning material which may deteriorate over time during storage and can be replaced as needed.

本発明は、上述した課題を解決するものであり、保管時における緩衝材の健全性を確認することのできる放射性物質収納容器の保護装置および放射性物質収納容器を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a protective device for a radioactive material storage container and a radioactive material storage container capable of confirming the soundness of the cushioning material at the time of storage.

上述の目的を達成するために、本開示の一態様に係る放射性物質収納容器の保護装置は、胴部と前記胴部を密閉する蓋部とを有する放射性物質収納容器を保護する保護装置であって、少なくとも前記蓋部の径方向外側に設けられ変形することで衝撃を吸収する緩衝材を有する緩衝体と、前記緩衝材と経年劣化の性質が同等の材料からなり前記放射性物質収納容器の周囲に配置される劣化監視部材と、を備える。 In order to achieve the above-mentioned object, the protective device for the radioactive material storage container according to one aspect of the present disclosure is a protective device for protecting the radioactive material storage container having a body portion and a lid portion for sealing the body portion. The periphery of the radioactive material storage container is made of at least a cushioning material provided on the radial outer side of the lid portion and having a cushioning material that absorbs impact by being deformed, and a material having the same aging properties as the cushioning material. It is provided with a deterioration monitoring member arranged in.

上述の目的を達成するために、本開示の一態様に係る放射性物質収納容器は、胴部と、前記胴部を密閉する蓋部と、上述した保護装置と、を含む。 In order to achieve the above-mentioned object, the radioactive material storage container according to one aspect of the present disclosure includes a body portion, a lid portion for sealing the body portion, and the above-mentioned protection device.

本発明によれば、保管時における緩衝材の健全性を確認することができる。 According to the present invention, the soundness of the cushioning material at the time of storage can be confirmed.

図1は、放射性物質収納容器の一部裁断概略図である。FIG. 1 is a partially cut schematic view of a radioactive material storage container. 図2は、実施形態の保護装置を示す平面図である。FIG. 2 is a plan view showing the protective device of the embodiment. 図3は、実施形態の保護装置を示す側断面図である。FIG. 3 is a side sectional view showing the protective device of the embodiment. 図4は、実施形態の緩衝体の詳細構造を示す側断面図である。FIG. 4 is a side sectional view showing a detailed structure of the shock absorber of the embodiment. 図5は、実施形態の緩衝体の詳細構造の動作を示す側断面図である。FIG. 5 is a side sectional view showing the operation of the detailed structure of the shock absorber of the embodiment. 図6は、実施形態の放射性物質収納容器の他の保管状態を示す側断面図である。FIG. 6 is a side sectional view showing another storage state of the radioactive material storage container of the embodiment.

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。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components 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、放射性物質収納容器の一部裁断概略図である。 FIG. 1 is a partially cut schematic view of a radioactive material storage container.

図1および図2に示すように、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とから構成されている。胴部12は、容器本体21を有している。容器本体21は、筒状(本実施形態では円筒形状)の上端に開口部22が形成され、下端が閉塞して形成されている。容器本体21は、内部にキャビティ23を有し、このキャビティ23にバスケット24が設けられている。バスケット24は、放射性物質(例えば、使用済燃料集合体)を個々に収納可能な複数のセル25が設けられている。容器本体21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が、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、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。 As shown in FIGS. 1 and 2, the cask 11 as a radioactive material storage container is composed of a body portion 12 and a lid portion 13. The body portion 12 has a container body 21. The container body 21 is formed by forming an opening 22 at the upper end of a tubular shape (cylindrical shape in the present embodiment) and closing the lower end thereof. The container body 21 has a cavity 23 inside, and a basket 24 is provided in the cavity 23. The basket 24 is provided with a plurality of cells 25 that can individually store radioactive substances (for example, spent fuel assemblies). The container body 21 is a forged product made of carbon steel having a γ-ray shielding function, but stainless steel can also be used instead of carbon steel. Further, cast products such as spheroidal graphite cast iron and carbon steel cast steel can also be used.

胴部12は、容器本体21の外周面に所定の隙間を開けて外筒26が配設されている。容器本体21の外周面と外筒26の内周面との間に、熱伝導を行う銅製の伝熱フィン27が周方向に複数設けられている。容器本体21と外筒26と伝熱フィン27とで囲まれる空間部に、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)28が設けられている。 In the body portion 12, the outer cylinder 26 is arranged with a predetermined gap on the outer peripheral surface of the container main body 21. A plurality of copper heat transfer fins 27 for conducting heat are provided in the circumferential direction between the outer peripheral surface of the container body 21 and the inner peripheral surface of the outer cylinder 26. A resin (neutron shield) 28 containing a boron or a boron compound having a neutron shielding function, which is a polymer material containing a large amount of hydrogen, in a space surrounded by a container body 21, an outer cylinder 26, and a heat transfer fin 27. Is provided.

胴部12は、容器本体21の閉塞された下端の下側に突出する底部29が設けられている。底部29は、容器本体21の外径よりも小さく形成され、容器本体21の閉塞された下端とで囲まれる空間部を有し、この空間部にレジン(中性子遮蔽体)が設けられている。 The body portion 12 is provided with a bottom portion 29 projecting below the closed lower end of the container body 21. The bottom portion 29 is formed to be smaller than the outer diameter of the container body 21, and has a space portion surrounded by the closed lower end of the container body 21, and a resin (neutron shield) is provided in this space portion.

胴部12は、容器本体21にキャスク11を吊上げるためのトラニオン30が設けられている。トラニオン30は、容器本体21から外筒26を貫通して設けられ、キャスク11において最も外周に突出する。 The body portion 12 is provided with a trunnion 30 for lifting the cask 11 on the container body 21. The trunnion 30 is provided so as to penetrate the outer cylinder 26 from the container main body 21, and protrudes most outward in the cask 11.

蓋部13は、容器本体21の開口部22に設けられ、開口部22を閉塞して容器本体21(胴部12))を密閉する。蓋部13は、一次蓋31と二次蓋32とを含んで構成される。一次蓋31は、γ線を遮蔽する炭素鋼やステンレス鋼を材料として円盤形状に形成される。二次蓋32は、一次蓋31を覆ってキャスク11の外側に表れるもので、一次蓋31と同様に、γ線を遮蔽する炭素鋼やステンレス鋼を材料として円盤形状に形成される。一次蓋31と二次蓋32との間は、レジン(中性子遮蔽体)28が設けられていてもよい。 The lid portion 13 is provided in the opening portion 22 of the container main body 21 and closes the opening portion 22 to seal the container main body 21 (body portion 12). The lid portion 13 includes a primary lid 31 and a secondary lid 32. The primary lid 31 is formed in a disk shape using carbon steel or stainless steel that shields γ-rays as a material. The secondary lid 32 covers the primary lid 31 and appears on the outside of the cask 11, and is formed in a disk shape using carbon steel or stainless steel that shields γ-rays as a material, like the primary lid 31. A resin (neutron shield) 28 may be provided between the primary lid 31 and the secondary lid 32.

一次蓋31は、容器本体21の開口部22に形成された第一段部22aに対し、炭素鋼やステンレス鋼を材料とするボルト(図示せず)により固定されて容器本体21に取り付けられる。二次蓋32は、容器本体21の開口部22に形成された第二段部22bに対し、炭素鋼やステンレス鋼を材料とするボルト(図示せず)により固定されて容器本体21に取り付けられる。図には明示しないが、一次蓋31と第一段部22aとの間、および二次蓋32と第二段部22bとの間には、金属ガスケットが設けられる。これら、金属ガスケットにより、一次蓋31と第一段部22aとの間、および二次蓋32と第二段部22bとの間の密封性が確保される。 The primary lid 31 is fixed to the first stage portion 22a formed in the opening 22 of the container main body 21 by bolts (not shown) made of carbon steel or stainless steel and attached to the container main body 21. The secondary lid 32 is fixed to the second stage portion 22b formed in the opening 22 of the container main body 21 by bolts (not shown) made of carbon steel or stainless steel and attached to the container main body 21. .. Although not specified in the figure, a metal gasket is provided between the primary lid 31 and the first stage portion 22a, and between the secondary lid 32 and the second stage portion 22b. These metal gaskets ensure the sealing performance between the primary lid 31 and the first stage portion 22a and between the secondary lid 32 and the second stage portion 22b.

また、胴部12において、容器本体21の開口部22には、二次蓋32の周りを囲み、キャスク11の外側に表れる筒状の上端縁22cが形成されている。上端縁22cは、その上面が二次蓋32の表面よりも高い位置にあって、二次蓋32の周りを囲む。上端縁22cの上面には、キャスク11を輸送する際に用いられる緩衝体や、本実施形態の緩衝体1が取り付けられるボルト穴33が周方向に複数設けられている。 Further, in the body portion 12, the opening portion 22 of the container main body 21 is formed with a cylindrical upper end edge 22c that surrounds the secondary lid 32 and appears on the outside of the cask 11. The upper end edge 22c has an upper surface higher than the surface of the secondary lid 32 and surrounds the secondary lid 32. On the upper surface of the upper end edge 22c, a plurality of cushioning bodies used for transporting the cask 11 and a plurality of bolt holes 33 to which the buffering body 1 of the present embodiment is attached are provided in the circumferential direction.

図2は、実施形態の保護装置を示す平面図である。図3は、実施形態の保護装置を示す側断面図である。 FIG. 2 is a plan view showing the protective device of the embodiment. FIG. 3 is a side sectional view showing the protective device of the embodiment.

図2および図3に示すように、保護装置は、貯蔵場所に保管される放射性物質収納容器であるキャスク11を保護するものである。キャスク11の保護とは、保管中のキャスク11を落下物から保護したり、転倒したキャスク11を衝撃から保護したりすることである。この保護装置は、緩衝体1と、劣化監視部材4と、を有する。 As shown in FIGS. 2 and 3, the protective device protects the cask 11 which is a radioactive material storage container stored in the storage place. The protection of the cask 11 is to protect the stored cask 11 from falling objects and to protect the fallen cask 11 from an impact. This protective device has a shock absorber 1 and a deterioration monitoring member 4.

緩衝体1は、支持部材2と、緩衝材3と、を有する。 The cushioning body 1 has a support member 2 and a cushioning material 3.

支持部材2は、保護部2Aと、支持部2Bと、を含む。保護部2Aは、剛体からなる。剛体とは、所定の荷重を受け止めて変形を抑制されているもので、例えば、鋼材からなり、鋼板やボックスやパイプで構成される。所定の荷重とは、想定する落下物の落下の荷重や、床Fに立てたキャスク11が転倒した場合の床Fに当たってキャスク11に掛かる荷重である。保護部2Aは、剛体を構成するうえで中実の鋼材からなることが好ましい。保護部2Aは、キャスク11の蓋部13であって外側に表れる二次蓋32の表面に沿って配置される。本実施形態において、保護部2Aは、二次蓋32の表面および容器本体21の上端縁22cの表面を覆うように構成される。保護部2Aは、上端縁22cに設けられたボルト穴33に取り付けられるボルト(図示せず)により、容器本体21に固定される。保護部2Aは、本実施形態では胴部12の外形に合わせて形成され円形状に形成されている。 The support member 2 includes a protection portion 2A and a support portion 2B. The protection portion 2A is made of a rigid body. A rigid body is a body that receives a predetermined load and is restrained from being deformed. For example, it is made of a steel material and is composed of a steel plate, a box, or a pipe. The predetermined load is a load on which a falling object is assumed to fall, or a load applied to the cask 11 when the cask 11 standing on the floor F hits the floor F and falls. The protective portion 2A is preferably made of a solid steel material in order to form a rigid body. The protective portion 2A is arranged along the surface of the secondary lid 32 which is the lid portion 13 of the cask 11 and appears on the outside. In the present embodiment, the protective portion 2A is configured to cover the surface of the secondary lid 32 and the surface of the upper end edge 22c of the container body 21. The protective portion 2A is fixed to the container body 21 by a bolt (not shown) attached to the bolt hole 33 provided in the upper end edge 22c. In the present embodiment, the protection portion 2A is formed in accordance with the outer shape of the body portion 12 and is formed in a circular shape.

支持部2Bは、保護部2Aの外周に一体に設けられる。支持部2Bは、保護部2Aの外周から径方向外側に延びて設けられている。支持部2Bは、蓋部13よりも径方向外側に配置され胴部12よりも径方向外側に突出して設けられる。本実施形態では、支持部2Bは、胴部12の上端縁22cの外側を囲むように配置されていることで、蓋部13よりも径方向外側に配置され胴部12よりも径方向外側に突出して設けられる。支持部2Bは、所定の荷重により変形する。支持部2Bは、保護部2Aよりも薄い薄板金属、薄板金属で形成されたボックスやパイプで構成される。支持部2Bは、本実施形態では胴部12の外形に合わせて形成され円形状に形成されている。支持部2Bは、保護部2Aに対して溶接やボルト締結により取り付けられる。 The support portion 2B is integrally provided on the outer periphery of the protection portion 2A. The support portion 2B is provided so as to extend radially outward from the outer periphery of the protection portion 2A. The support portion 2B is arranged radially outward from the lid portion 13 and is provided so as to project radially outward from the body portion 12. In the present embodiment, the support portion 2B is arranged so as to surround the outside of the upper end edge 22c of the body portion 12, so that the support portion 2B is arranged radially outside the lid portion 13 and radially outside the body portion 12. It is provided so as to protrude. The support portion 2B is deformed by a predetermined load. The support portion 2B is composed of a thin plate metal thinner than the protection portion 2A, and a box or pipe made of the thin plate metal. In the present embodiment, the support portion 2B is formed in accordance with the outer shape of the body portion 12 and is formed in a circular shape. The support portion 2B is attached to the protection portion 2A by welding or bolting.

ここで、径方向とは、胴部12の中心を通り開口部22と底部29を貫く中心軸CLを設け、この中心軸CLに交差する方向を言い、ある位置より中心軸CLから遠ざかる方向を径方向外側と言い、ある位置より中心軸CLに近づく方向を径方向内側と言う。なお、中心軸CLに沿う方向を軸方向と言い、中心軸CLの周りを囲む方向(中心軸CLを中心とする周り方向)を周方向と言う。 Here, the radial direction is a direction in which a central axis CL is provided that passes through the center of the body portion 12 and penetrates the opening 22 and the bottom portion 29, intersects the central axis CL, and is a direction away from the central axis CL from a certain position. It is called the radial outer side, and the direction closer to the central axis CL than a certain position is called the radial inner side. The direction along the central axis CL is referred to as an axial direction, and the direction surrounding the central axis CL (circumferential direction around the central axis CL) is referred to as a circumferential direction.

緩衝材3は、支持部材2の支持部2Bに支持される。緩衝材3は、少なくとも支持部2Bが設けられた範囲に設けられている。緩衝材3は、所定の荷重により変形する。緩衝材3は、木材、発泡材や高分子化合物で構成される。また、緩衝材3は、支持部2Bと同様に、保護部2Aよりも薄い薄板金属、薄板金属で形成されたボックスやパイプで構成されてもよい。 The cushioning material 3 is supported by the support portion 2B of the support member 2. The cushioning material 3 is provided at least in the range where the support portion 2B is provided. The cushioning material 3 is deformed by a predetermined load. The cushioning material 3 is composed of wood, a foaming material, and a polymer compound. Further, the cushioning material 3 may be composed of a thin plate metal thinner than the protective portion 2A, a box or a pipe made of the thin plate metal, similarly to the support portion 2B.

図4は、実施形態の緩衝体の詳細構造を示す側断面図である。図5は、実施形態の緩衝体の詳細構造の動作を示す側断面図である。 FIG. 4 is a side sectional view showing a detailed structure of the shock absorber of the embodiment. FIG. 5 is a side sectional view showing the operation of the detailed structure of the shock absorber of the embodiment.

上述したように、緩衝体1は、緩衝材3が支持部材2の支持部2Bに支持されている。図4および図5に示すように、緩衝材3は、被覆部3Aで覆われている。被覆部3Aは、ステンレスなどの鋼材からなり、緩衝材3を密閉して覆うことが好ましい。緩衝材3が、上述したように木材や発泡材や高分子化合物で構成されている場合、外気に触れて経年劣化を生ずる。本実施形態の緩衝体1では、緩衝材3が被覆部3Aで覆われているため、経年劣化を抑制できる。ここで、緩衝材3が木材である場合、緩衝材3を被覆部3Aで覆わないと、緩衝材3が外気に触れるため温度以外の様々な要因により経年劣化を生ずる。一方、緩衝材3が木材である場合、緩衝材3を被覆部3Aで密閉して覆うと、緩衝材3が外気に触れないため主に温度を要因として経年劣化を生ずる。このように、木材である緩衝材3を被覆部3Aで密閉して覆うことで、経年劣化の主要因を温度に限定できる。そして、後述する劣化監視部材4により緩衝材3の健全性を正確に確認できる。 As described above, in the cushioning body 1, the cushioning material 3 is supported by the support portion 2B of the support member 2. As shown in FIGS. 4 and 5, the cushioning material 3 is covered with the covering portion 3A. The covering portion 3A is made of a steel material such as stainless steel, and it is preferable that the cushioning material 3 is hermetically covered. When the cushioning material 3 is made of wood, a foaming material, or a polymer compound as described above, it is exposed to the outside air and deteriorates over time. In the cushioning body 1 of the present embodiment, since the cushioning material 3 is covered with the covering portion 3A, deterioration over time can be suppressed. Here, when the cushioning material 3 is made of wood, if the cushioning material 3 is not covered with the covering portion 3A, the cushioning material 3 comes into contact with the outside air, so that deterioration over time occurs due to various factors other than temperature. On the other hand, when the cushioning material 3 is made of wood, if the cushioning material 3 is hermetically covered with the covering portion 3A, the cushioning material 3 does not come into contact with the outside air, so that deterioration over time occurs mainly due to the temperature. In this way, by sealing and covering the cushioning material 3 which is wood with the covering portion 3A, the main factor of aging deterioration can be limited to the temperature. Then, the soundness of the cushioning material 3 can be accurately confirmed by the deterioration monitoring member 4 described later.

また、図4および図5に示すように、支持部2Bは、緩衝材3を収容する収容部2Cを有する。収容部2Cは、収容本体2Caと、蓋2Cbとで構成される。収容本体2Caは、緩衝材3を収容する箱状に形成されている。蓋2Cbは、収容本体2Caを開閉でき、蓋2Cbを開けることで収容本体2Caに緩衝材3を収容したり、収容本体2Caから緩衝材3を取り出したりできる。すなわち、図5に示すように、古い緩衝材3aを新しい緩衝材3bに交換できる。 Further, as shown in FIGS. 4 and 5, the support portion 2B has a storage portion 2C for accommodating the cushioning material 3. The accommodating portion 2C is composed of an accommodating main body 2Ca and a lid 2Cb. The accommodating body 2Ca is formed in a box shape for accommodating the cushioning material 3. The lid 2Cb can open and close the accommodating main body 2Ca, and by opening the lid 2Cb, the cushioning material 3 can be accommodated in the accommodating main body 2Ca, and the cushioning material 3 can be taken out from the accommodating main body 2Ca. That is, as shown in FIG. 5, the old cushioning material 3a can be replaced with the new cushioning material 3b.

本実施形態において、緩衝材3は、図2に示すように複数に分割して構成されている。緩衝材3は、全体で円環状に構成されており、周方向で複数に分割されている。分割数は、図2では12分割であるが、6分割や24分割などでもよく、緩衝材3の単体の重量が、例えば20Kg以下のように作業者が1人で持ち運べる重量であるように分割する。一方、支持部2Bは、分割された緩衝材3を個々に収容できるように収容部2Cが緩衝材3の数分分割して構成されている。このように、緩衝材3は、複数の収容部2Cに着脱できる小さな部材としたカートリッジ式に構成されている。 In the present embodiment, the cushioning material 3 is configured by being divided into a plurality of parts as shown in FIG. The cushioning material 3 is formed in an annular shape as a whole, and is divided into a plurality of parts in the circumferential direction. Although the number of divisions is 12 in FIG. 2, it may be divided into 6 or 24, and the weight of the cushioning material 3 alone is divided so that the weight can be carried by one operator, for example, 20 kg or less. do. On the other hand, the support portion 2B is configured such that the accommodating portion 2C is divided by the number of the cushioning material 3 so that the divided cushioning material 3 can be individually accommodated. As described above, the cushioning material 3 is configured as a cartridge type as a small member that can be attached to and detached from the plurality of accommodating portions 2C.

上記緩衝体1は、貯蔵場所である貯蔵設備に輸送されたキャスク11に取り付けられる。キャスク11は、原子力発電設備において、例えば、使用済燃料集合体が容器本体21のバスケット24のセル25収納され、蓋部13によって密閉される。このキャスク11は、例えば、原子力発電設備から貯蔵設備に輸送される。輸送にかかり、キャスク11は、輸送用緩衝体(図示せず)が取り付けられる。輸送用緩衝体は、国際原子力機関(IAEA:International Atomic Energy Agency)の安全基準、放射性物質安全輸送規則2005年版において、事故時の輸送条件に耐える能力(密閉性、遮蔽性、未臨界性の維持)を実証するための落下試験として、高さ9mからの落下事象(落下試験I)や、直立した直径15cmの丸棒上への高さ1mからの落下事象(落下試験II)が課せられている。落下事象は、例えば(1)中心軸CLを垂直方向に向けた垂直落下、(2)中心軸CLを水平方向に向けた水平落下、(3)中心軸CLを斜めに向けた角部落下、がある。この輸送用緩衝体は、胴部12の上端縁22cおよび底部29にそれぞれ被さるように配置される。上端縁22cに被さる輸送用緩衝体は、上端縁22cに設けられたボルト穴33に取り付けられるボルト(図示せず)により、胴部12に固定される。輸送中、輸送用緩衝体が取り付けられたキャスク11は、中心軸CLを水平方向に向けた横置き状態で輸送される。そして、貯蔵場所である貯蔵設備に輸送されたキャスク11は、輸送用緩衝体が外され、蓋部13を上に向けて床Fに立てた保管状態とされ、本実施形態の緩衝体1が取り付けられる。また、保管時、キャスク11は、底部29が架台37に嵌められて転倒をし難くされる。 The shock absorber 1 is attached to a cask 11 transported to a storage facility which is a storage place. In the nuclear power generation facility, for example, the spent fuel assembly is housed in the cell 25 of the basket 24 of the container body 21, and the cask 11 is sealed by the lid portion 13. The cask 11 is transported from, for example, a nuclear power generation facility to a storage facility. Upon transportation, a transport cushion (not shown) is attached to the cask 11. The transport buffer is capable of withstanding transport conditions in the event of an accident (maintenance of airtightness, shielding, and subcriticality) in the 2005 edition of the International Atomic Energy Agency (IAEA) Safety Standards, Radioactive Material Safe Transport Regulations. ), A drop event from a height of 9 m (drop test I) and a drop event from a height of 1 m on an upright round bar with a diameter of 15 cm (drop test II) are imposed. There is. The fall events are, for example, (1) a vertical drop with the central axis CL in the vertical direction, (2) a horizontal drop with the central axis CL in the horizontal direction, and (3) a corner drop with the central axis CL at an angle. There is. The transport cushion is arranged so as to cover the upper end edge 22c and the bottom portion 29 of the body portion 12, respectively. The transport buffer covering the upper end edge 22c is fixed to the body portion 12 by bolts (not shown) attached to the bolt holes 33 provided in the upper end edge 22c. During transportation, the cask 11 to which the transport buffer is attached is transported in a horizontal position with the central axis CL oriented in the horizontal direction. Then, the cask 11 transported to the storage facility, which is a storage place, is in a storage state in which the transport buffer is removed and the lid 13 is erected on the floor F with the lid portion 13 facing upward. It is attached. Further, during storage, the bottom 29 of the cask 11 is fitted to the gantry 37 to prevent the cask 11 from tipping over.

劣化監視部材4は、緩衝体1の緩衝材3と同等の材料で形成され、カートリッジ式とした緩衝材3よりもさらに小さく軽いものとされている。同等の材料とは、緩衝材3をなす材料と同等の経年劣化の性質を有するものであって、緩衝材3をなす木材や発泡材や高分子化合物と同材料であること、または緩衝材3をなす木材とは異なる木材や、緩衝材3をなす発泡材とは異なる発泡材や、緩衝材3をなす高分子化合物とは異なる高分子化合物であることを含む。劣化監視部材4は、キャスク11の周囲に配置される。劣化監視部材4が配置される箇所は、支持部材2の保護部2Aや、キャスク11の胴部12(外筒26)や、架台37がある。劣化監視部材4は、支持部材2の保護部2Aや、キャスク11の胴部12(外筒26)や、架台37に対して複数個所にそれぞれ配置される。このため、劣化監視部材4は、キャスク11の外部に設けられ、外気に触れるように設けられている。 The deterioration monitoring member 4 is made of the same material as the cushioning material 3 of the cushioning body 1, and is smaller and lighter than the cartridge type cushioning material 3. The equivalent material has the same aging properties as the material forming the cushioning material 3, and is the same material as the wood, foam material, or polymer compound forming the cushioning material 3, or the cushioning material 3. It includes a wood different from the wood forming the cushioning material, a foaming material different from the foaming material forming the cushioning material 3, and a polymer compound different from the polymer compound forming the cushioning material 3. The deterioration monitoring member 4 is arranged around the cask 11. Places where the deterioration monitoring member 4 is arranged include the protection portion 2A of the support member 2, the body portion 12 (outer cylinder 26) of the cask 11, and the gantry 37. The deterioration monitoring member 4 is arranged at a plurality of locations with respect to the protective portion 2A of the support member 2, the body portion 12 (outer cylinder 26) of the cask 11, and the gantry 37, respectively. Therefore, the deterioration monitoring member 4 is provided outside the cask 11 so as to come into contact with the outside air.

このように、本実施形態の保護装置は、胴部12と胴部12を密閉する蓋部13とを有する放射性物質収納容器であるキャスク11を保護する保護装置であって、少なくとも蓋部13の径方向外側に設けられ変形することで衝撃を吸収する緩衝材3を有する緩衝体1と、緩衝材3と経年劣化の性質が同等の材料からなりキャスク11の周囲に配置される劣化監視部材4と、を備える。 As described above, the protective device of the present embodiment is a protective device for protecting the cask 11 which is a radioactive material storage container having a body portion 12 and a lid portion 13 for sealing the body portion 12, and at least the lid portion 13. A deterioration monitoring member 4 is made of a cushioning material 1 having a cushioning material 3 provided on the outer side in the radial direction and absorbing an impact by being deformed, and a material having the same aging deterioration properties as the cushioning material 3, and is arranged around the cask 11. And.

本実施形態の保護装置によれば、キャスク11の保管時に、定期的(例えば、数年ごと)に劣化監視部材4を取り出し、劣化監視部材4が有する緩衝材の圧縮強度が規定値以下となった場合、緩衝材3の緩衝機能が低下したと判断でき、緩衝体1または緩衝材3を取り換える。この結果、本実施形態の保護装置によれば、保管時における緩衝材3の健全性を確認することができ、緩衝材3の健全性を維持できる。キャスク11は、固体ごとに収納している放射性物質の発熱量が異なり、緩衝体1の緩衝材3に係る温度も異なるため、キャスク11の固体ごとに装着した緩衝体1における緩衝材3の経年劣化の度合いが異なる。よって、キャスク11の固体ごとに劣化監視部材4を設置することで、各キャスク11に装着した緩衝体1における緩衝材3の健全性を確認し、必要に応じて取り換えることができる。 According to the protective device of the present embodiment, when the cask 11 is stored, the deterioration monitoring member 4 is taken out periodically (for example, every few years), and the compressive strength of the cushioning material of the deterioration monitoring member 4 becomes a specified value or less. If this is the case, it can be determined that the cushioning function of the cushioning material 3 has deteriorated, and the cushioning body 1 or the cushioning material 3 is replaced. As a result, according to the protective device of the present embodiment, the soundness of the cushioning material 3 at the time of storage can be confirmed, and the soundness of the cushioning material 3 can be maintained. Since the calorific value of the radioactive substance stored in the cask 11 is different for each solid and the temperature of the cushioning material 3 of the buffer 1 is also different, the aging of the cushioning material 3 in the cushioning body 1 attached to each solid of the cask 11 is different. The degree of deterioration is different. Therefore, by installing the deterioration monitoring member 4 for each solid of the cask 11, the soundness of the cushioning material 3 in the cushioning body 1 attached to each cask 11 can be confirmed and replaced as necessary.

また、本実施形態の保護装置では、劣化監視部材4は、キャスク11の周囲の複数個所に配置される。 Further, in the protective device of the present embodiment, the deterioration monitoring member 4 is arranged at a plurality of places around the cask 11.

従って、この保護装置によれば、キャスク11の周囲の複数個所において、保管時における緩衝材3の健全性を確認することができる。キャスク11は、収納している放射性物質の発熱量に伴って場所ごとに温度が異なり、緩衝体1の緩衝材3に与える温度も異なるため、キャスク11の周囲の複数個所に劣化監視部材4を配置することで、キャスク11に装着した緩衝体1における緩衝材3の健全性を確認し、必要に応じて取り換えることができる。 Therefore, according to this protective device, the soundness of the cushioning material 3 at the time of storage can be confirmed at a plurality of places around the cask 11. Since the temperature of the cask 11 differs from place to place according to the calorific value of the stored radioactive material and the temperature given to the cushioning material 3 of the cushioning body 1 also differs, deterioration monitoring members 4 are provided at a plurality of places around the cask 11. By arranging the cushioning material 3, the soundness of the cushioning material 3 in the cushioning body 1 attached to the cask 11 can be confirmed, and the cushioning material 3 can be replaced if necessary.

また、本実施形態の保護装置では、劣化監視部材4は、キャスク11に収納された放射性物質から緩衝材3が受ける平均温度よりも高い温度となる場所に配置される。 Further, in the protective device of the present embodiment, the deterioration monitoring member 4 is arranged at a temperature higher than the average temperature received by the cushioning material 3 from the radioactive material stored in the cask 11.

緩衝材3が受ける平均温度よりも高い温度となる位置に劣化監視部材4が配置されることで、緩衝材3と比較して劣化監視部材4の経年劣化の度合いが高くなり、緩衝材3が緩衝機能を失う前に交換を行うことができる。 By arranging the deterioration monitoring member 4 at a position where the temperature becomes higher than the average temperature received by the cushioning material 3, the degree of aging deterioration of the deterioration monitoring member 4 is higher than that of the cushioning material 3, and the cushioning material 3 becomes It can be replaced before it loses its cushioning function.

また、本実施形態の保護装置では、緩衝体1は、蓋部13(二次蓋32)の表面に沿って配置され緩衝材3を支持する鋼材からなる支持部材2を有し、劣化監視部材4は、支持部材2に配置される。 Further, in the protective device of the present embodiment, the cushioning body 1 has a support member 2 made of a steel material arranged along the surface of the lid portion 13 (secondary lid 32) and supporting the cushioning material 3, and is a deterioration monitoring member. 4 is arranged on the support member 2.

支持部材2は、保護する対象箇所であるキャスク11の蓋部13表面に沿って配置され、この支持部材2に緩衝材3が支持されている。従って、緩衝材3を支持する支持部材2に劣化監視部材4を設けることで、鋼材である支持部材2から緩衝材3に伝わる温度による経年劣化を確認できる。 The support member 2 is arranged along the surface of the lid portion 13 of the cask 11 which is a target portion to be protected, and the cushioning material 3 is supported by the support member 2. Therefore, by providing the deterioration monitoring member 4 on the support member 2 that supports the cushioning material 3, it is possible to confirm the aged deterioration due to the temperature transmitted from the support member 2 which is a steel material to the cushioning material 3.

また、本実施形態の保護装置では、劣化監視部材4は、胴部12に配置される。 Further, in the protective device of the present embodiment, the deterioration monitoring member 4 is arranged on the body portion 12.

劣化監視部材4の配置場所は、キャスク11の胴部12であってもよい。 The place where the deterioration monitoring member 4 is arranged may be the body portion 12 of the cask 11.

また、本実施形態の保護装置では、床Fに載置されて胴部12を支える架台37,38を有し、劣化監視部材4は、架台37,38に載置される。 Further, the protective device of the present embodiment has pedestals 37 and 38 mounted on the floor F to support the body portion 12, and the deterioration monitoring member 4 is mounted on the pedestals 37 and 38.

劣化監視部材4の配置場所は、キャスク11の胴部12を支える架台37,38であってもよい。 The place where the deterioration monitoring member 4 is arranged may be a frame 37, 38 that supports the body portion 12 of the cask 11.

また、本実施形態の保護装置では、劣化監視部材4は、周囲が断熱材で覆われている。 Further, in the protective device of the present embodiment, the periphery of the deterioration monitoring member 4 is covered with a heat insulating material.

劣化監視部材4の周囲が断熱材で覆われていると、劣化監視部材4の温度を高く保つことができ、緩衝材3と比較して劣化監視部材4の経年劣化の度合いが高くなり、緩衝材3が緩衝機能を失う前に交換を行うことができる。断熱材は、劣化監視部材4の周囲の全てに設けられることが、温度を高く保つうえで好ましい。 When the periphery of the deterioration monitoring member 4 is covered with a heat insulating material, the temperature of the deterioration monitoring member 4 can be kept high, and the degree of aging deterioration of the deterioration monitoring member 4 is higher than that of the cushioning material 3, and the cushioning is performed. The material 3 can be replaced before it loses its cushioning function. It is preferable that the heat insulating material is provided all around the deterioration monitoring member 4 in order to keep the temperature high.

また、本実施形態の保護装置では、緩衝体1は、緩衝材3を被覆する被覆部3Aを有し、劣化監視部材4は、緩衝材3と同材料からなり、かつ被覆部3Aを有する。 Further, in the protective device of the present embodiment, the cushioning body 1 has a covering portion 3A that covers the cushioning material 3, and the deterioration monitoring member 4 is made of the same material as the cushioning material 3 and has a covering portion 3A.

緩衝材3を被覆部3Aで被覆することで、緩衝材3が外気と触れることを防ぎ、緩衝材3の経年劣化の主要因を温度に限定できる。しかも、緩衝材3と同材料からなる劣化監視部材4を、緩衝材3と同じく被覆部で被覆して同構成とすることで、緩衝材3と同じく劣化監視部材4の経年劣化の主要因を温度に限定でき、緩衝体1における緩衝材3の健全性を正確に確認できる。なお、劣化監視部材4の周囲を断熱材で覆う場合、断熱材と被覆部は、どちらが劣化監視部材4側に配置されていてもよい。 By covering the cushioning material 3 with the covering portion 3A, the cushioning material 3 can be prevented from coming into contact with the outside air, and the main factor of the aged deterioration of the cushioning material 3 can be limited to the temperature. Moreover, by covering the deterioration monitoring member 4 made of the same material as the cushioning material 3 with the covering portion in the same manner as the cushioning material 3 to have the same configuration, the main factor of the aged deterioration of the deterioration monitoring member 4 as in the cushioning material 3 can be determined. It can be limited to the temperature, and the soundness of the cushioning material 3 in the cushioning body 1 can be confirmed accurately. When the periphery of the deterioration monitoring member 4 is covered with a heat insulating material, either the heat insulating material or the covering portion may be arranged on the deterioration monitoring member 4 side.

また、本実施形態の保護装置では、緩衝体1は、緩衝材3を収容する収容部2Cを有する。 Further, in the protective device of the present embodiment, the cushioning body 1 has an accommodating portion 2C for accommodating the cushioning material 3.

緩衝材3を収容部2Cに収容することで、緩衝材3が外気と触れることを防ぎ、緩衝材3の経年劣化を抑制できる。被覆部3Aで被覆された緩衝材3を収容部2Cに収容すれば、緩衝材3を二重構造で外気と触れることを防ぎ、緩衝材3の経年劣化をより抑制できる。 By accommodating the cushioning material 3 in the accommodating portion 2C, it is possible to prevent the cushioning material 3 from coming into contact with the outside air and suppress deterioration of the cushioning material 3 over time. If the cushioning material 3 coated with the covering portion 3A is housed in the accommodating portion 2C, the cushioning material 3 can be prevented from coming into contact with the outside air due to the double structure, and the aged deterioration of the cushioning material 3 can be further suppressed.

また、本実施形態の保護装置では、緩衝体1は、緩衝材3が複数に分割されてそれぞれ着脱可能に設けられている。緩衝体1は、上述したように、支持部材2の外側で円環状に構成され、周方向で複数に分割されており、支持部材2に対して着脱可能に設けられている。 Further, in the protective device of the present embodiment, the cushioning body 1 is provided so that the cushioning material 3 is divided into a plurality of parts and can be attached to and detached from each other. As described above, the shock absorber 1 is formed in an annular shape on the outside of the support member 2, is divided into a plurality of parts in the circumferential direction, and is detachably provided on the support member 2.

緩衝材3を複数に分割してそれぞれ着脱可能に構成することで、個々の緩衝材3が小さく軽く構成され、取り扱いが容易となる。従って、各緩衝材3を交換でき、この交換を容易に行うことができる。なお、緩衝材3を複数に分割した場合、収容部2Cは、複数に分割された緩衝材3を個々に独立して収容することが、各緩衝材3の取り扱いを容易にするうえで好ましい。 By dividing the cushioning material 3 into a plurality of parts and making them removable, the individual cushioning materials 3 are made small and light and easy to handle. Therefore, each cushioning material 3 can be replaced, and this replacement can be easily performed. When the cushioning material 3 is divided into a plurality of parts, it is preferable that the accommodating portion 2C individually and independently accommodates the cushioning material 3 divided into a plurality of parts in order to facilitate the handling of each cushioning material 3.

また、本実施形態の保護装置では、劣化監視部材4は、複数設けられ、複数に分割された各緩衝材3の配置に合わせて配置されている。 Further, in the protective device of the present embodiment, a plurality of deterioration monitoring members 4 are provided, and are arranged according to the arrangement of the cushioning materials 3 divided into the plurality.

例えば、図2に示すように、中心軸CLの周りに12分割とした緩衝材3に対し、劣化監視部材4を中心軸CLの周りに6個配置する。そして、周方向で隣接する2つの緩衝材3-1の近傍に合わせて1つの劣化監視部材4-1を配置する。同様に、周方向で隣接する2つの緩衝材3-2の近傍に合わせて1つの劣化監視部材4-2を配置し、周方向で隣接する2つの緩衝材3-3の近傍に合わせて1つの劣化監視部材4-3を配置し、周方向で隣接する2つの緩衝材3-4の近傍に合わせて1つの劣化監視部材4-4を配置し、周方向で隣接する2つの緩衝材3-5の近傍に合わせて1つの劣化監視部材4-5を配置し、周方向で隣接する2つの緩衝材3-6の近傍に合わせて1つの劣化監視部材4-6を配置する。本実施形態の保護装置は、劣化監視部材4-1が有する緩衝材の圧縮強度が規定値以下となった場合、2つの緩衝材3-1の緩衝機能が低下したと判断でき、緩衝材3-1を取り換える。同様に、劣化監視部材4-2の試験結果に応じて2つの緩衝材3-2を取り換え、劣化監視部材4-3の試験結果に応じて2つの緩衝材3-3を取り換え、劣化監視部材4-4の試験結果に応じて2つの緩衝材3-4を取り換え、劣化監視部材4-5の試験結果に応じて2つの緩衝材3-5を取り換え、劣化監視部材4-6の試験結果に応じて2つの緩衝材3-6を取り換える。このように、複数に分割された各緩衝材3の配置に合わせてそれぞれ劣化監視部材4を配置することで、各緩衝材3が受ける温度に近似する温度を劣化監視部材4が受けることができ、当該劣化監視部材4を試験することで合わせた配置の緩衝材3の経年劣化の度合いを正確に把握でき、必要に応じて取り換えが行える。 For example, as shown in FIG. 2, six deterioration monitoring members 4 are arranged around the central axis CL with respect to the cushioning material 3 divided into 12 around the central axis CL. Then, one deterioration monitoring member 4-1 is arranged in the vicinity of the two cushioning materials 3-1 adjacent to each other in the circumferential direction. Similarly, one deterioration monitoring member 4-2 is arranged in the vicinity of two cushioning materials 3-2 adjacent in the circumferential direction, and 1 is arranged in the vicinity of two cushioning materials 3-3 adjacent in the circumferential direction. One deterioration monitoring member 4-3 is arranged, one deterioration monitoring member 4-4 is arranged in the vicinity of two cushioning materials 3-4 adjacent in the circumferential direction, and two cushioning materials 3 adjacent in the circumferential direction are arranged. One deterioration monitoring member 4-5 is arranged in the vicinity of -5, and one deterioration monitoring member 4-6 is arranged in the vicinity of two cushioning materials 3-6 adjacent in the circumferential direction. In the protective device of the present embodiment, when the compressive strength of the cushioning material of the deterioration monitoring member 4-1 is equal to or less than the specified value, it can be determined that the cushioning functions of the two cushioning materials 3-1 have deteriorated, and the cushioning material 3 Replace -1. Similarly, the two cushioning materials 3-2 are replaced according to the test result of the deterioration monitoring member 4-2, and the two cushioning materials 3-3 are replaced according to the test result of the deterioration monitoring member 4-3. Two cushioning materials 3-4 are replaced according to the test result of 4-4, two cushioning materials 3-5 are replaced according to the test result of the deterioration monitoring member 4-5, and the test result of the deterioration monitoring member 4-6. Replace the two cushioning materials 3-6 according to the situation. In this way, by arranging the deterioration monitoring member 4 according to the arrangement of each of the cushioning materials 3 divided into a plurality of parts, the deterioration monitoring member 4 can receive a temperature close to the temperature received by each cushioning material 3. By testing the deterioration monitoring member 4, the degree of aging deterioration of the cushioning material 3 in the combined arrangement can be accurately grasped, and the cushioning material 3 can be replaced as necessary.

また、本実施形態の放射性物質収納容器であるキャスク11は、胴部12と、胴部12を密閉する蓋部13と、上述した保護装置と、を備える。 Further, the cask 11 which is the radioactive material storage container of the present embodiment includes a body portion 12, a lid portion 13 for sealing the body portion 12, and the above-mentioned protection device.

従って、本実施形態のキャスク11によれば、保管時における緩衝材3の健全性を確認できる。 Therefore, according to the cask 11 of the present embodiment, the soundness of the cushioning material 3 at the time of storage can be confirmed.

図6は、実施形態の放射性物質収納容器の他の保管状態を示す側断面図である。 FIG. 6 is a side sectional view showing another storage state of the radioactive material storage container of the embodiment.

本実施形態の保護装置において、キャスク11は、図6に示すように、中心軸CLを水平方向に向けた横置き状態で架台38にトラニオン30を支持された保管状態もある。この場合も、劣化監視部材4は、支持部材2の保護部2Aや、キャスク11の胴部12(外筒26)や、架台38のように、キャスク11の周囲に配置される。劣化監視部材4は、支持部材2の保護部2Aや、キャスク11の胴部12(外筒26)や、架台38に対して複数個所にそれぞれ配置される。 In the protective device of the present embodiment, as shown in FIG. 6, the cask 11 is also in a storage state in which the trunnion 30 is supported by the gantry 38 in a horizontal state in which the central axis CL is oriented in the horizontal direction. Also in this case, the deterioration monitoring member 4 is arranged around the cask 11 like the protective portion 2A of the support member 2, the body portion 12 (outer cylinder 26) of the cask 11, and the gantry 38. The deterioration monitoring member 4 is arranged at a plurality of locations with respect to the protective portion 2A of the support member 2, the body portion 12 (outer cylinder 26) of the cask 11, and the gantry 38, respectively.

このように、キャスク11を横置きにしても、保管時における緩衝材3の健全性を確認できる。 In this way, even if the cask 11 is placed horizontally, the soundness of the cushioning material 3 at the time of storage can be confirmed.

1 緩衝体
2 支持部材
2C 収容部
3 緩衝材
3A 被覆部
4 劣化監視部材
11 キャスク(放射性物質収納容器)
12 胴部
13 蓋部
37,38 架台
F 床
1 Cushioning body 2 Supporting member 2C Cushioning part 3 Cushioning material 3A Covering part 4 Deterioration monitoring member 11 Cask (Radioactive material storage container)
12 Body 13 Lid 37,38 Stand F Floor

Claims (12)

胴部と前記胴部を密閉する蓋部とを有する放射性物質収納容器を保護する保護装置であって、
少なくとも前記蓋部の径方向外側に設けられ変形することで衝撃を吸収する緩衝材を有する緩衝体と、
前記緩衝材と経年劣化の性質が同等の材料からなり前記放射性物質収納容器の周囲に配置される劣化監視部材と、
を備える、保護装置。
A protective device for protecting a radioactive material storage container having a body portion and a lid portion for sealing the body portion.
A cushioning body provided at least on the radial outer side of the lid portion and having a cushioning material that absorbs impact by being deformed, and
A deterioration monitoring member made of a material having the same aging deterioration properties as the cushioning material and arranged around the radioactive material storage container, and
A protective device.
前記劣化監視部材は、前記放射性物質収納容器の周囲の複数個所に配置される、請求項1に記載の保護装置。 The protective device according to claim 1, wherein the deterioration monitoring member is arranged at a plurality of places around the radioactive material storage container. 前記劣化監視部材は、前記放射性物質収納容器に収納された放射性物質から前記緩衝材が受ける平均温度よりも高い温度となる場所に配置される、請求項1または2に記載の保護装置。 The protective device according to claim 1 or 2, wherein the deterioration monitoring member is arranged at a temperature higher than the average temperature received by the cushioning material from the radioactive material stored in the radioactive material storage container. 前記緩衝体は、前記蓋部の表面に沿って配置され前記緩衝材を支持する鋼材からなる支持部材を有し、
前記劣化監視部材は、前記支持部材に配置される、請求項1から3のいずれか1項に記載の保護装置。
The cushioning body has a support member made of a steel material which is arranged along the surface of the lid portion and supports the cushioning material.
The protective device according to any one of claims 1 to 3, wherein the deterioration monitoring member is arranged on the support member.
前記劣化監視部材は、前記胴部に配置される、請求項1から4のいずれか1項に記載の保護装置。 The protective device according to any one of claims 1 to 4, wherein the deterioration monitoring member is arranged on the body portion. 床に載置されて前記胴部を支える架台を有し、
前記劣化監視部材は、前記架台に載置される、請求項1から5のいずれか1項に記載の保護装置。
It has a pedestal that is placed on the floor and supports the body.
The protective device according to any one of claims 1 to 5, wherein the deterioration monitoring member is mounted on the gantry.
前記劣化監視部材は、周囲が断熱材で覆われている、請求項1から6のいずれか1項に記載の保護装置。 The protective device according to any one of claims 1 to 6, wherein the deterioration monitoring member is covered with a heat insulating material. 前記緩衝体は、前記緩衝材を被覆する被覆部を有し、
前記劣化監視部材は、前記緩衝材と同材料からなり、かつ前記被覆部を有する、請求項1から7のいずれか1項に記載の保護装置。
The cushioning body has a covering portion that covers the cushioning material, and has a covering portion.
The protective device according to any one of claims 1 to 7, wherein the deterioration monitoring member is made of the same material as the cushioning material and has the covering portion.
前記緩衝体は、前記緩衝材を収容する収容部を有する、請求項1から8のいずれか1項に記載の保護装置。 The protective device according to any one of claims 1 to 8, wherein the cushioning body has an accommodating portion for accommodating the cushioning material. 前記緩衝体は、前記緩衝材が複数に分割されてそれぞれ着脱可能に設けられている、請求項1から9のいずれか1項に記載の保護装置。 The protective device according to any one of claims 1 to 9, wherein the cushioning material is provided by dividing the cushioning material into a plurality of parts and attaching and detaching each of the cushioning materials. 前記劣化監視部材は、複数設けられ、複数に分割された各前記緩衝材の配置に合わせて配置されている、請求項10に記載の保護装置。 The protective device according to claim 10, wherein a plurality of the deterioration monitoring members are provided and arranged according to the arrangement of the cushioning materials divided into the plurality. 胴部と、
前記胴部を密閉する蓋部と、
請求項1から11のいずれか1項に記載の保護装置と、
を含む、放射性物質収納容器。
With the torso
A lid that seals the body and
The protective device according to any one of claims 1 to 11.
Including radioactive material storage container.
JP2020112846A 2020-06-30 2020-06-30 Protective device for radioactive substance storage container and radioactive substance storage container Active JP7336420B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020112846A JP7336420B2 (en) 2020-06-30 2020-06-30 Protective device for radioactive substance storage container and radioactive substance storage container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020112846A JP7336420B2 (en) 2020-06-30 2020-06-30 Protective device for radioactive substance storage container and radioactive substance storage container

Publications (2)

Publication Number Publication Date
JP2022011603A true JP2022011603A (en) 2022-01-17
JP7336420B2 JP7336420B2 (en) 2023-08-31

Family

ID=80148280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2020112846A Active JP7336420B2 (en) 2020-06-30 2020-06-30 Protective device for radioactive substance storage container and radioactive substance storage container

Country Status (1)

Country Link
JP (1) JP7336420B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158400U (en) * 1982-04-15 1983-10-22 株式会社神戸製鋼所 cask buffer
JPH08320307A (en) * 1995-05-25 1996-12-03 Hitachi Ltd Degradation-detection sensor and its measuring method
JP2005321348A (en) * 2004-05-11 2005-11-17 Hitachi Ltd Shock absorber for fuel transportation storage cask and its manufacturing method
KR20100069930A (en) * 2008-12-17 2010-06-25 한국원자력연구원 Radiation material transportation package having insulation and shock absorbing function
JP2018169173A (en) * 2017-03-29 2018-11-01 株式会社神戸製鋼所 Storage cask

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158400U (en) * 1982-04-15 1983-10-22 株式会社神戸製鋼所 cask buffer
JPH08320307A (en) * 1995-05-25 1996-12-03 Hitachi Ltd Degradation-detection sensor and its measuring method
JP2005321348A (en) * 2004-05-11 2005-11-17 Hitachi Ltd Shock absorber for fuel transportation storage cask and its manufacturing method
KR20100069930A (en) * 2008-12-17 2010-06-25 한국원자력연구원 Radiation material transportation package having insulation and shock absorbing function
JP2018169173A (en) * 2017-03-29 2018-11-01 株式会社神戸製鋼所 Storage cask

Also Published As

Publication number Publication date
JP7336420B2 (en) 2023-08-31

Similar Documents

Publication Publication Date Title
US10872707B2 (en) Nuclear waste storage canisters
US9022189B2 (en) Cask cushioning body
US9672948B2 (en) Cask apparatus, system and method for transporting and/or storing high level waste
US11373773B2 (en) Method for making containment cask for drum containing radioactive hazardous waste
US3886368A (en) Spent fuel shipping cask
KR101014006B1 (en) Radiation material transportation package having insulation and shock absorbing function
US20210257119A1 (en) Unventilated cask for storing nuclear waste
RU2611057C1 (en) Container for storage and transportation of spent fuel assemblies and case for their arrangement
JP3411902B2 (en) Closed container for transport storage
JP6769902B2 (en) Storage container
US9117555B2 (en) Transportation container of fuel assembly
US20030010938A1 (en) Double-chamber container for transporting or storing radioactive materials
JP7336420B2 (en) Protective device for radioactive substance storage container and radioactive substance storage container
JP6129501B2 (en) Radioactive substance storage container gantry and radioactive substance storage container support structure
JP7356953B2 (en) Buffer lid, protection device for radioactive material storage container, and protection method for radioactive material storage container
JP2007240173A (en) Transportation/storage vessel of radioactive material
RU2463677C1 (en) Shipping packaging set for spent fuel assemblies of nuclear reactors
JP2024067901A (en) Radioactive material storage container protection device and radioactive material storage container
JP7071852B2 (en) Radioactive material transportation storage container
KR102683491B1 (en) Transport packaging set for transport of fissile material containing uranium
JP2001174592A (en) Storage method and device for spent fuel
JP2002174693A (en) Container for transporting radioactive material
JP2023059088A (en) Basket of used fuel transportation cask or storage cask
Dreesen et al. Transport and storage casks for irradiated fuel assemblies from research reactors
JP2004117008A (en) Radioactive material storing cask

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20221214

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20230725

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230726

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20230821

R150 Certificate of patent or registration of utility model

Ref document number: 7336420

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150