JP5848651B2 - Nuclear fuel storage container and method of storing fuel assembly in nuclear fuel storage container - Google Patents

Nuclear fuel storage container and method of storing fuel assembly in nuclear fuel storage container Download PDF

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JP5848651B2
JP5848651B2 JP2012068560A JP2012068560A JP5848651B2 JP 5848651 B2 JP5848651 B2 JP 5848651B2 JP 2012068560 A JP2012068560 A JP 2012068560A JP 2012068560 A JP2012068560 A JP 2012068560A JP 5848651 B2 JP5848651 B2 JP 5848651B2
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shock absorbing
nuclear fuel
storage container
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side wall
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嗣彬 西川
嗣彬 西川
中根　一起
一起 中根
堂守　生剛
生剛 堂守
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Hitachi GE Nuclear Energy 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
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Description

本発明は、核燃料収納容器および燃料集合体の核燃料収納容器への収納方法に係り、特に、原子炉から取り出された使用済燃料集合体を輸送、貯蔵するのに好適な核燃料収納容器および燃料集合体の核燃料収納容器への収納方法に関する。   The present invention relates to a nuclear fuel storage container and a method for storing a fuel assembly in a nuclear fuel storage container, and in particular, a nuclear fuel storage container and a fuel assembly suitable for transporting and storing spent fuel assemblies taken out from a nuclear reactor. The present invention relates to a method for storing a body in a nuclear fuel storage container.

原子力プラントにおいて原子炉圧力容器内の炉心に装荷され、所定期間使用されて使用済になった燃料集合体は、原子力発電所内の冷却プール内に保管されて冷却される。所定期間保管されて崩壊熱の発生量が低下した使用済燃料集合体は、核燃料収納容器に収納されて中間貯蔵施設に輸送され、中間貯蔵施設内に貯蔵される。輸送および貯蔵時において内部の使用済燃料集合体からの放射線の漏洩を防ぐために、核燃料収納容器には放射線遮へいが施されている。   A fuel assembly loaded in a reactor core in a nuclear reactor pressure vessel and used after a predetermined period of time is stored in a cooling pool in a nuclear power plant and cooled. Spent fuel assemblies that have been stored for a predetermined period and have a reduced decay heat generation amount are stored in nuclear fuel storage containers, transported to an intermediate storage facility, and stored in the intermediate storage facility. In order to prevent radiation leakage from the spent fuel assembly inside during transportation and storage, the nuclear fuel storage container is provided with radiation shielding.

核燃料収納容器は、通常、上端部が開口した円筒状の容器本体、容器本体内に設置された横断面が格子状のバスケット、および容器本体の開口を封鎖する複数の蓋部材を有する。複数の燃料棒を束ねた複数体の使用済燃料集合体が、容器本体内でバスケットによって仕切られた各領域にそれぞれ収納される。   A nuclear fuel storage container usually has a cylindrical container body having an open upper end, a basket having a lattice-like cross section installed in the container body, and a plurality of lid members that seal the opening of the container body. A plurality of spent fuel assemblies in which a plurality of fuel rods are bundled are stored in respective regions partitioned by a basket in the container body.

輸送時などで万が一高所などから落下した場合においても、内部に収納された使用済燃料集合体に含まれる核燃料物質を外部に漏洩させないことがそのような核燃料収納容器に求められる。このような要求に対しては、通常、容器本体の上端部および下端部にそれぞれ木材の緩衝体を取り付けている。また、核燃料収納容器の落下時に衝撃を受けた際における内部の使用済燃料集合体の安全性をさらに高めるために、容器本体内にも衝撃吸収装置を設置することも考えられている。また、落下時における蓋部材に加わる荷重を低減することを考慮した場合、収容された使用済燃料集合体と蓋部材の間に衝撃吸収装置を配置することが有効である。   Even in the case of dropping from a high place or the like during transportation, such nuclear fuel storage container is required not to leak the nuclear fuel material contained in the spent fuel assembly stored inside. In response to such a requirement, usually, a wooden cushion is attached to each of the upper end and the lower end of the container body. In order to further improve the safety of the spent fuel assembly inside when the nuclear fuel storage container is subjected to an impact, it is also considered to install an impact absorbing device in the container body. In consideration of reducing the load applied to the lid member at the time of dropping, it is effective to dispose an impact absorbing device between the stored spent fuel assembly and the lid member.

使用済燃料集合体と蓋部材の間に衝撃吸収装置を配置することが、特開２０１１−１３０５号公報および特開２００２−３４１０８５号公報に記載されている。   JP-A-2011-1305 and JP-A-2002-341085 describe that an impact absorbing device is disposed between a spent fuel assembly and a lid member.

特開２０１１−１３０５号公報には、カバー部材に複数の筒状の緩衝体を設けた衝撃吸収装置が記載されている。可燃性毒物組み立て体が上方より挿入された複数の使用済燃料集合体が燃料集合体収納容器（核燃料収納容器）内に収納され、衝撃吸収装置が燃料集合体収納容器の蓋部材と燃料集合体収納容器内の使用済燃料集合体の間に配置される。   Japanese Patent Application Laid-Open No. 2011-1305 describes an impact absorbing device in which a cover member is provided with a plurality of cylindrical buffer bodies. A plurality of spent fuel assemblies into which a combustible poison assembly is inserted from above are stored in a fuel assembly storage container (nuclear fuel storage container), and an impact absorbing device includes a cover member of the fuel assembly storage container and the fuel assembly It arrange | positions between the spent fuel assemblies in a storage container.

特開２００２−３４１０８５号公報には、使用済燃料集合体を収納するキャニスタが内部に設置されたコンクリートキャスク（核燃料収納容器）が記載されている。使用済燃料集合体の収納領域を画定する格子状のバスケットがキャニスタの容器本体内に設けられ、遮へい板がバスケットの上方に置かれている。衝撃吸収装置である複数のスペーサが遮へい板の下面に取り付けられ、各スペーサがキャニスタの容器本体内に収納されたそれぞれの使用済燃料集合体の上方に配置されている（特開２００２−３４１０８５号公報の図１７参照）。各スペーサは、筒状（円筒状、角筒状）または棒状（円柱状、角柱状）をしている。さらに、特開２００２−３４１０８５号公報の図１８には、それらのスペーサを取り付けた保持板を、キャニスタの容器本体内に配置してバスケットにより支持することが記載されている。保持板に設けられた各スペーサは、容器本体内に収納された使用済燃料集合体と遮へい板の間に配置される。   Japanese Patent Laid-Open No. 2002-341085 describes a concrete cask (nuclear fuel storage container) in which a canister for storing a spent fuel assembly is installed. A grid-like basket defining a storage area for spent fuel assemblies is provided in the container body of the canister, and a shielding plate is placed above the basket. A plurality of spacers, which are shock absorbers, are attached to the lower surface of the shielding plate, and each spacer is disposed above each spent fuel assembly housed in the container body of the canister (Japanese Patent Laid-Open No. 2002-341085). See FIG. 17 of the publication). Each spacer has a cylindrical shape (cylindrical shape, rectangular tube shape) or a rod shape (columnar shape, prismatic shape). Furthermore, FIG. 18 of Japanese Patent Laid-Open No. 2002-341085 describes that a holding plate to which those spacers are attached is arranged in a container body of a canister and supported by a basket. Each spacer provided on the holding plate is disposed between the spent fuel assembly housed in the container body and the shielding plate.

特開２０１１−１３０３５号公報JP 2011-13035 A 特開２００２−３４１０８５号公報Japanese Patent Laid-Open No. 2002-341085

核燃料収納容器が高所から落下した場合、各燃料収納容器内に配置された上記のような衝撃吸収装置は、核燃料収納容器に収納された使用済燃料集合体と蓋部材の間に作用した衝撃荷重を受け、座屈や塑性などにより、変形することでエネルギーを吸収し、使用済燃焼集合体および核燃料収納容器の蓋部材に働く荷重を低減させる。しかしながら、衝撃を吸収した衝撃吸収装置は大きく形状が変化するため、特開２０１１−１３０３５号公報および特開２００２−３４１０８５号公報に記載された各核燃料収納容器では、変形後の衝撃吸収装置が使用済燃料集合体および核燃料収納容器のバスケットと干渉する可能性がある。このため、大きく変形した衝撃吸収装置が核燃料収納容器内のバスケットまたは使用済燃料集合体に引っかかり、核燃料収納容器から使用済燃料集合体を取り出すことが困難になる恐れがある。   When a nuclear fuel storage container falls from a high place, the impact absorbing device as described above arranged in each fuel storage container has an impact applied between the spent fuel assembly stored in the nuclear fuel storage container and the lid member. Energy is absorbed by receiving a load and deforming due to buckling or plasticity, and the load acting on the spent combustion assembly and the cover member of the nuclear fuel storage container is reduced. However, since the shape of the shock absorbing device that has absorbed the impact changes greatly, each of the nuclear fuel storage containers described in Japanese Patent Laid-Open Nos. 2011-13035 and 2002-341085 uses a deformed shock absorbing device. May interfere with spent fuel assemblies and nuclear fuel storage baskets. For this reason, there is a possibility that the greatly deformed shock absorbing device is caught by the basket or the spent fuel assembly in the nuclear fuel storage container and it becomes difficult to take out the spent fuel assembly from the nuclear fuel storage container.

本発明の目的は、落下時における内部の燃料集合体の損傷を防止することができ、燃料集合体を容易に取り出すことができる核燃料収納容器および燃料集合体の核燃料収納容器への収納方法を提供することにある。   An object of the present invention is to provide a nuclear fuel storage container that can prevent damage to an internal fuel assembly at the time of dropping and that can be easily taken out, and a method for storing the fuel assembly in the nuclear fuel storage container. There is to do.

上記した目的を達成する本発明の特徴は、下端部が封鎖されて上端部が開放された容器本体と、容器本体内に設置されて燃料集合体の複数の収納領域を画定するバスケットと、容器本体の上端部に取り外し可能に取り付けられる蓋部材と、それぞれの収納領域内に燃料集合体が収納された状態で、燃料集合体と蓋部材の間に配置される衝撃吸収装置とを備え、衝撃吸収装置が、連結部、およびこの連結部に連結される複数の衝撃吸収部を有し、それぞれの衝撃吸収部が、その連結部に連結される板状の側壁部およびこの側壁部に連なって燃料集合体と対向する曲り部を含んでいることにある。   A feature of the present invention that achieves the above-described object is that a container body having a lower end sealed and an upper end opened, a basket that is installed in the container body and defines a plurality of storage areas for the fuel assembly, and a container A lid member that is detachably attached to the upper end of the main body, and an impact absorbing device that is disposed between the fuel assembly and the lid member in a state in which the fuel assembly is stored in each storage region, The absorber includes a connecting portion and a plurality of shock absorbing portions connected to the connecting portion, and each shock absorbing portion is connected to the plate-like side wall portion connected to the connecting portion and the side wall portion. It exists in including the bending part which opposes a fuel assembly.

核燃料収納容器が落下したときに内部の燃料集合体により蓋部材に加わる衝撃力を、衝撃吸収装置の衝撃吸収部の変形により吸収することができ、核燃料収納容器の落下時における燃料集合体の損傷を防止することができる。また、核燃料収納容器の落下時において、衝撃吸収部が衝撃吸収部の側壁部の幅方向よりもこの側壁部の肉厚方向に変形するので、変形した衝撃吸収部と、バスケットおよび核燃料収納容器内の燃料集合体の構造部材との干渉を回避することができる。このため、落下した核燃料収納容器から燃料集合体を容易に取り出すことができる。   When the nuclear fuel storage container falls, the impact force applied to the lid member by the internal fuel assembly can be absorbed by the deformation of the shock absorbing portion of the shock absorber, and the fuel assembly is damaged when the nuclear fuel storage container falls. Can be prevented. Further, when the nuclear fuel storage container is dropped, the shock absorbing portion is deformed in the thickness direction of the side wall portion rather than the width direction of the side wall portion of the shock absorbing portion, so that the deformed shock absorbing portion, the basket and the nuclear fuel storage container Interference with the structural member of the fuel assembly can be avoided. Therefore, the fuel assembly can be easily taken out from the dropped nuclear fuel storage container.

本発明によれば、核燃料収納容器の落下時におけるその内部に存在する燃料集合体の損傷を防止することができ、さらに、核燃料収納容器の落下後にこの核燃料収納容器から内部の燃料集合体を容易に取り出すことができる。   According to the present invention, it is possible to prevent damage to the fuel assembly existing inside the nuclear fuel storage container when the nuclear fuel storage container is dropped, and to easily remove the internal fuel assembly from the nuclear fuel storage container after the nuclear fuel storage container is dropped. Can be taken out.

本発明の好適な一実施例である実施例１の核燃料収納容器の斜視図である。It is a perspective view of the nuclear fuel storage container of Example 1 which is one suitable Example of this invention. 図１に示す核燃料収納容器の内部構造を示す斜視図である。It is a perspective view which shows the internal structure of the nuclear fuel storage container shown in FIG. 図１に示す核燃料収納容器内に収納される使用済燃料集合体の斜視図である。It is a perspective view of the spent fuel assembly accommodated in the nuclear fuel storage container shown in FIG. 図１に示す核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container shown in FIG. 図４に示す衝撃吸収装置を設けた、図１に示す核燃料収納容器の内部の構成図である。It is a block diagram inside the nuclear fuel storage container shown in FIG. 1 which provided the impact-absorbing device shown in FIG. 図５において衝撃吸収装置の配置を上方より見た平面図である。It is the top view which looked at arrangement | positioning of the impact-absorbing device in FIG. 5 from upper direction. 図４に示す衝撃吸収装置が衝撃を受けたときに変形した状態を示す説明図である。It is explanatory drawing which shows the state which deform | transformed when the impact-absorbing device shown in FIG. 4 received the impact. 本発明の他の実施例である実施例２の核燃料収納容器の内部の構成図である。It is a block diagram inside the nuclear fuel storage container of Example 2 which is another Example of this invention. 図８において衝撃吸収装置の配置を上方より見た平面図である。It is the top view which looked at the arrangement | positioning of an impact-absorbing device in FIG. 8 from upper direction. 図８に示す衝撃吸収装置の斜視図である。It is a perspective view of the shock absorber shown in FIG. 本発明の他の実施例である実施例３の核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container of Example 3 which is another Example of this invention. 本発明の他の実施例である実施例４の核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container of Example 4 which is another Example of this invention. 図１２に示す衝撃吸収装置が衝撃を受けたときに変形した状態を示す説明図である。It is explanatory drawing which shows the state which deform | transformed when the impact-absorbing device shown in FIG. 12 received the impact. 本発明の他の実施例である実施例５の核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container of Example 5 which is another Example of this invention. 本発明の他の実施例である実施例６の核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container of Example 6 which is another Example of this invention. 本発明の他の実施例である実施例７の核燃料収納容器内に設けられる衝撃吸収装置の斜視図である。It is a perspective view of the impact-absorbing device provided in the nuclear fuel storage container of Example 7 which is another Example of this invention.

本発明の実施例を以下に説明する。   Examples of the present invention will be described below.

本発明の好適な一実施例である実施例１の核燃料収納容器を、図１〜図６を用いて説明する。本実施例の核燃料収納容器１は、沸騰水型原子炉の炉心から取り出された使用済燃料集合体を収納する。本実施例の核燃料収納容器１は、加圧水型原子炉等の他の原子炉で発生する使用済燃料集合体を収納する核燃料収納容器にも適用することができる。   A nuclear fuel storage container according to embodiment 1 which is a preferred embodiment of the present invention will be described with reference to FIGS. The nuclear fuel storage container 1 of this embodiment stores a spent fuel assembly taken out from the core of a boiling water reactor. The nuclear fuel storage container 1 of the present embodiment can also be applied to a nuclear fuel storage container that stores spent fuel assemblies generated in other nuclear reactors such as a pressurized water reactor.

核燃料収納容器１は、容器本体２、バスケット３、蓋部材４Ａ，４Ｂ，４Ｃおよび衝撃吸収装置５を有する。格子状のバスケット３が、容器本体２内に設置され、容器本体２内において収納される複数の使用済燃料集合体９のそれぞれの収納領域を画定している。蓋部材４Ａ，４Ｂ，４Ｃは、バスケット３の上端から上方に向かって蓋部材４Ａ，４Ｂ，４Ｃの順に配置され、容器本体２にそれぞれ取り外し可能に取り付けられる。蓋部材４Ａ，４Ｂ，４Ｃの容器本体２への取り付けは、容器本体２内に所定体数の使用済燃料集合体９が収納された後に行われる。   The nuclear fuel storage container 1 includes a container body 2, a basket 3, lid members 4A, 4B, and 4C, and an impact absorbing device 5. A lattice-like basket 3 is installed in the container main body 2 and demarcates a storage area of each of the plurality of spent fuel assemblies 9 stored in the container main body 2. The lid members 4A, 4B, 4C are arranged in the order of the lid members 4A, 4B, 4C from the upper end of the basket 3 to the upper side, and are detachably attached to the container body 2. The lid members 4A, 4B, and 4C are attached to the container body 2 after a predetermined number of spent fuel assemblies 9 are stored in the container body 2.

沸騰水型原子炉の炉心から取り出された使用済燃料集合体９は、複数の燃料棒１０、下部タイプレート（下部燃料支持部材）１１、上部タイプレート（上部燃料支持部材）１２およびチャンネルボックス１５を有する。各燃料棒１０の下端部は下部タイプレート１１によって支持され、各燃料棒１０の上端部が上部タイプレート１２によって保持される。ハンドル１３が上部タイプレート１２に設けられる。これらの燃料棒１０は、相互間に所定の間隔を形成するように、燃料スペーサ１４によって束ねられる。燃料スペーサ１４によって束ねられた燃料棒１０の束は、上部タイプレート１２に取り付けられたチャンネルボックス１５によって取り囲まれている。チャンネルボックス１５は上部タイプレート１２から下部タイプレート１１に向かって伸びている。   A spent fuel assembly 9 taken out from the core of the boiling water reactor includes a plurality of fuel rods 10, a lower tie plate (lower fuel support member) 11, an upper tie plate (upper fuel support member) 12, and a channel box 15. Have The lower end portion of each fuel rod 10 is supported by a lower tie plate 11, and the upper end portion of each fuel rod 10 is held by an upper tie plate 12. A handle 13 is provided on the upper tie plate 12. These fuel rods 10 are bundled by a fuel spacer 14 so as to form a predetermined interval between them. The bundle of fuel rods 10 bundled by the fuel spacer 14 is surrounded by a channel box 15 attached to the upper tie plate 12. The channel box 15 extends from the upper tie plate 12 toward the lower tie plate 11.

沸騰水型原子炉の炉心から取り出された使用済燃料集合体９は、原子力発電所内の燃料貯蔵プール内に保管されて冷却水により冷却される。この燃料貯蔵プール内で所定期間の間保管されて崩壊熱の発生量が低下した複数の使用済燃料集合体９が、核燃料収納容器１の容器本体２内でバスケット３によって画定された各収納領域内に収納される。所定体数の使用済燃料集合体９が収納された後、衝撃吸収装置５がそれらの使用済燃料集合体９の上に置かれ、蓋部材４Ａ，４Ｂ，４Ｃが、この順番で、容器本体２に取り付けられて容器本体２が密封される。   The spent fuel assembly 9 taken out from the core of the boiling water reactor is stored in a fuel storage pool in a nuclear power plant and cooled by cooling water. A plurality of spent fuel assemblies 9 that have been stored in the fuel storage pool for a predetermined period and the amount of decay heat generated has decreased, are stored in the storage areas defined by the basket 3 in the container body 2 of the nuclear fuel storage container 1. Stored inside. After the predetermined number of spent fuel assemblies 9 are stored, the impact absorbing device 5 is placed on the spent fuel assemblies 9, and the lid members 4A, 4B, 4C are arranged in this order in the container body. 2 and the container body 2 is sealed.

本実施例で用いられる衝撃吸収装置５は、図４に示されるように、一対の連結部６Ａ，６ＢおよびＵ字状の複数の衝撃吸収部７を有する。衝撃吸収部７は、例えば、幅が３０ｍｍで肉厚が５ｍｍの板状をしている。各衝撃吸収部７の一端部が連結部６Ａに連結しており、各衝撃吸収部７の他端部が連結部６Ｂに連結している。各衝撃吸収部７には曲面を有する曲り部１６が形成される。衝撃吸収部７において、連結部６Ａと曲り部１６の間の部分および連結部６Ｂと曲り部１６の間の部分はそれぞれ側壁部である。衝撃吸収部７の側壁部の幅方向が、連結部６Ａ（または連結部６Ｂ）の長手方向になっている。   As shown in FIG. 4, the shock absorbing device 5 used in this embodiment includes a pair of connecting portions 6 </ b> A and 6 </ b> B and a plurality of U-shaped shock absorbing portions 7. The impact absorbing portion 7 has, for example, a plate shape with a width of 30 mm and a thickness of 5 mm. One end of each impact absorbing portion 7 is connected to the connecting portion 6A, and the other end of each impact absorbing portion 7 is connected to the connecting portion 6B. Each shock absorbing portion 7 is formed with a curved portion 16 having a curved surface. In the shock absorbing part 7, the part between the connecting part 6A and the bent part 16 and the part between the connecting part 6B and the bent part 16 are side wall parts. The width direction of the side wall portion of the shock absorbing portion 7 is the longitudinal direction of the connecting portion 6A (or connecting portion 6B).

衝撃吸収装置５の製造は以下のように行われる。一枚の板をプレス加工することによって、板状の衝撃吸収部７、衝撃吸収部７の一端部に連結する板状の連結部６Ａおよび衝撃吸収部７の他端部に連結する板状の連結部６Ｂを有する中間製品が得られ、この中間製品の各衝撃吸収部７を、連結部６Ａ，６Ｂが互いに対向するように、プレスによりＵ字状に折り曲げることによって衝撃吸収装置５を製造することができる。   The shock absorber 5 is manufactured as follows. By pressing one plate, the plate-like impact absorbing portion 7, the plate-like connecting portion 6 </ b> A connected to one end of the impact absorbing portion 7, and the plate-like connecting portion connected to the other end of the impact absorbing portion 7 are used. An intermediate product having a connecting portion 6B is obtained, and the shock absorbing device 5 is manufactured by bending each impact absorbing portion 7 of this intermediate product into a U-shape by pressing so that the connecting portions 6A and 6B face each other. be able to.

複数の使用済燃料集合体９を容器本体２内のバスケット３で画定された各収納領域に別々に収納した後で蓋部材４Ａ，４Ｂ，４Ｃを取り付ける前に、衝撃吸収装置５が、容器本内２内に収納された使用済燃料集合体９の列ごとに配置される。衝撃吸収装置９の連結部６Ａ，６Ｂが、各列に含まれるそれぞれの使用済燃料集合体９のハンドル１３の上面に置かれる（図６参照）。このとき、衝撃吸収装置９の各衝撃吸収部７が、列に含まれるそれぞれの使用済燃料集合体９のチャンネルボックス１５の上端部の内側に別々に挿入され、衝撃吸収部７の曲り部１６が使用済燃料集合体９の上部タイプレート１２の上面に対向している。曲り部１６の下面が上部タイプレート１２の上面に接触する（図５参照）。曲り部１６の下面は、上部タイプレート１２の上面に接触していなく、上部タイプレート１２の上面よりも若干上方に位置してもよい。   After the plurality of spent fuel assemblies 9 are separately stored in the storage areas defined by the basket 3 in the container main body 2 and before the cover members 4A, 4B, 4C are attached, the shock absorbing device 5 It is arranged for each row of spent fuel assemblies 9 housed in the inside 2. The connecting portions 6A and 6B of the shock absorbing device 9 are placed on the upper surface of the handle 13 of each spent fuel assembly 9 included in each row (see FIG. 6). At this time, each shock absorbing portion 7 of the shock absorbing device 9 is separately inserted inside the upper end portion of the channel box 15 of each spent fuel assembly 9 included in the row, and the bent portion 16 of the shock absorbing portion 7 is inserted. Faces the upper surface of the upper tie plate 12 of the spent fuel assembly 9. The lower surface of the bent portion 16 contacts the upper surface of the upper tie plate 12 (see FIG. 5). The lower surface of the bent portion 16 may not be in contact with the upper surface of the upper tie plate 12 and may be positioned slightly above the upper surface of the upper tie plate 12.

曲り部１６の下面を上部タイプレート１２の上面に接触させて連結部６Ａ，６Ｂのそれぞれの下面とハンドル１３の上面の間に隙間を形成するように、各衝撃吸収装置９を、核燃料収納容器１内において使用済燃料集合体９と蓋部材４Ａの間に配置しても良い。   Each impact absorbing device 9 is connected to the nuclear fuel storage container so that the lower surface of the bent portion 16 is brought into contact with the upper surface of the upper tie plate 12 to form a gap between the lower surface of each of the coupling portions 6A and 6B and the upper surface of the handle 13. 1 may be disposed between the spent fuel assembly 9 and the lid member 4A.

衝撃吸収部７は、連結部６Ａ，６Ｂの長手方向においてチャンネルボックス１５の内面とハンドル１３の間に配置される。このとき、衝撃吸収部７の曲り部１６は、衝撃吸収部７の幅方向における衝撃吸収部７の側面が対向している（連結部６Ａ，６Ｂの長手方向に直交する方向に沿って位置している）チャンネルボックス１５の一辺で、衝撃吸収部７の側に位置するチャンネルボックス１５のその一辺の中央部に位置している。一体の使用済燃料集合体９において、２つの衝撃吸収部７がチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入される。一体の使用済燃料集合体９のチャンネルボックス１５の上端部内に挿入された２つの衝撃吸収部７の間には、この使用済燃料集合体９のハンドル１３が存在する。   The impact absorbing portion 7 is disposed between the inner surface of the channel box 15 and the handle 13 in the longitudinal direction of the connecting portions 6A and 6B. At this time, the bent portion 16 of the shock absorbing portion 7 faces the side surface of the shock absorbing portion 7 in the width direction of the shock absorbing portion 7 (positioned along the direction orthogonal to the longitudinal direction of the connecting portions 6A and 6B). It is located on one side of the channel box 15 at the center of that side of the channel box 15 located on the side of the shock absorber 7. In the integral spent fuel assembly 9, two impact absorbing portions 7 are inserted inside the channel box 15 at the upper end portion of the channel box 15. A handle 13 for the spent fuel assembly 9 exists between the two shock absorbers 7 inserted into the upper end portion of the channel box 15 of the integral spent fuel assembly 9.

各衝撃吸収装置５がそれぞれの列の使用済燃料集合体９のハンドル１３の上に置かれた後、蓋部材４Ａ，４Ｂ，４Ｃの順番にそれぞれの蓋部材が容器本体２に取り付けられる。蓋部材４Ａが容器本体２に取り付けられたとき、衝撃吸収装置９の連結部６Ａ，６Ｂは、ハンドル１３と蓋部材４Ａの間に配置される。この状態で、連結部６Ａ，６Ｂのそれぞれの上面と蓋部材４Ａの間には若干の隙間が形成される。連結部６Ａ，６Ｂのそれぞれの上面が蓋部材４Ａに接触してもよい。   After each impact absorbing device 5 is placed on the handle 13 of the spent fuel assembly 9 in each row, the respective lid members are attached to the container body 2 in the order of the lid members 4A, 4B, 4C. When the lid member 4A is attached to the container body 2, the connecting portions 6A and 6B of the shock absorber 9 are disposed between the handle 13 and the lid member 4A. In this state, a slight gap is formed between the upper surface of each of the connecting portions 6A and 6B and the lid member 4A. The upper surfaces of the connecting portions 6A and 6B may contact the lid member 4A.

所定体数の使用済燃料集合体９が収納されて上記したように容器本体２の内部に使用済燃料集合体９の上に複数の衝撃吸収装置９が置かれ、密封された核燃料収納容器１は、原子力発電所から核燃料再処理施設または中間貯蔵施設に輸送される。輸送される核燃料収納容器１の上部および下部には、核燃料収納容器１の落下時における核燃料収納容器１への衝撃を緩和するために木材の衝撃緩衝体が取り付けられている。   A predetermined number of spent fuel assemblies 9 are accommodated, and as described above, a plurality of impact absorbing devices 9 are placed on the spent fuel assemblies 9 inside the container body 2 and sealed in the nuclear fuel storage container 1. Are transported from nuclear power plants to nuclear fuel reprocessing or interim storage facilities. In order to reduce the impact on the nuclear fuel storage container 1 when the nuclear fuel storage container 1 is dropped, a wood impact buffer is attached to the upper and lower parts of the nuclear fuel storage container 1 to be transported.

この輸送時において、万が一、核燃料収納容器１が蓋部材４Ｃを下にして高所から地面に落下したことを想定する。核燃料収納容器１が地面に落下したときに核燃料収納容器１が受ける衝撃力は、上記した木材の衝撃緩衝体により緩和される。この落下時において核燃料収納容器１内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力が、各衝撃吸収装置５に設けられたそれぞれの衝撃吸収部７の変形によって吸収される。衝撃吸収部７は曲り部１６を形成するように平板をＵ字状に折り曲げた形状を有しているので、衝撃吸収部７は、衝撃吸収部７の幅方向、すなわち、連結部６Ａ，６Ｂの長手方向では変形しなく、この長手方向と直交する方向（図７に示す矢印８の方向）に変形する（図７参照）。 In this transportation, it is assumed that the nuclear fuel storage container 1 has fallen from the high place to the ground with the lid member 4C facing down. The impact force received by the nuclear fuel storage container 1 when the nuclear fuel storage container 1 falls on the ground is alleviated by the above-described impact shock absorber of wood. At the time of dropping, the impact force on the lid member 4A by the spent fuel assemblies 9 in the nuclear fuel storage container 1 is absorbed by the deformation of the respective impact absorbing portions 7 provided in the respective impact absorbing devices 5. Since the shock absorbing part 7 has a shape in which a flat plate is bent in a U shape so as to form a bent part 16, the shock absorbing part 7 is in the width direction of the shock absorbing part 7, that is, the connecting parts 6A and 6B. not deformed in the longitudinal direction, is deformed in a direction perpendicular to the longitudinal direction (direction of the arrow 8 shown in FIG. 7) (see FIG. 7).

このように、上記のような衝撃力を受けた衝撃吸収部７は一つの方向、すなわち、連結部６Ａ，６Ｂの長手方向と直交する方向において変形するので、変形した衝撃吸収部７が、核燃料収納容器１の構造部材（バスケット３）、または使用済燃料集合体９の構造部材（ハンドル１３および／またはチャンネルボックス１５）と干渉しにくい。特に、本実施例では、衝撃吸収部７の曲り部１６が、前述したように、衝撃吸収部７の幅方向における衝撃吸収部７の側面が対向している（連結部６Ａ，６Ｂの長手方向と直交する方向に沿って位置している）チャンネルボックス１５の一辺で、衝撃吸収部７の側に位置するチャンネルボックス１５のその一辺の中央部に位置しているので、変形した衝撃吸収部７とそれらの構造部材が干渉しにくくなっている。変形した衝撃吸収部７とそれらの構造部材との干渉を回避するためには、衝撃吸収部７の変形が進行する、連結部６Ａ，６Ｂの長手方向と直交する方向（矢印８の方向）において、衝撃吸収部７と、バスケット３、ハンドル１３およびチャンネルボックス１５のそれぞれとの間に、所定幅の間隙ｄ（図６参照）を形成することが望ましい。この間隙ｄの幅は、事前に変形解析などで衝撃吸収部７の変形を予測し、衝撃吸収部７の変形量が間隙ｄより小さくなるように設定する。   As described above, the shock absorbing portion 7 that has received the impact force described above is deformed in one direction, that is, in a direction orthogonal to the longitudinal direction of the connecting portions 6A and 6B. It is difficult to interfere with the structural member (basket 3) of the storage container 1 or the structural member (handle 13 and / or channel box 15) of the spent fuel assembly 9. In particular, in this embodiment, the bent portion 16 of the shock absorbing portion 7 faces the side surface of the shock absorbing portion 7 in the width direction of the shock absorbing portion 7 as described above (the longitudinal direction of the connecting portions 6A and 6B). Is located in the center of the one side of the channel box 15 located on the side of the shock absorbing portion 7, and is thus deformed. These structural members are less likely to interfere with each other. In order to avoid the interference between the deformed shock absorbing portion 7 and those structural members, the deformation of the shock absorbing portion 7 proceeds in the direction orthogonal to the longitudinal direction of the connecting portions 6A and 6B (the direction of the arrow 8). It is desirable to form a gap d (see FIG. 6) having a predetermined width between the shock absorbing portion 7 and each of the basket 3, the handle 13, and the channel box 15. The width of the gap d is set in advance so that the deformation of the shock absorbing portion 7 is predicted in advance by deformation analysis or the like, and the amount of deformation of the shock absorbing portion 7 is smaller than the gap d.

本実施例では、連結部材６Ａ，６Ｂに両端部が連結されているＵ字状の複数の衝撃吸収部７を有する衝撃吸収装置９を、所定体数の使用済燃料集合体９が収納された核燃料収納容器１内で使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置しているので、核燃料収納容器１が高所から落下してそれらの使用済燃料集合体９によって蓋部材４Ａに加えられる衝撃力を衝撃吸収装置９の各衝撃吸収部７の変形により吸収することができ、核燃料収納容器１の落下時における使用済燃料集合体９および蓋部材４Ａの損傷を防止することができる。   In this embodiment, a predetermined number of spent fuel assemblies 9 are stored in an impact absorbing device 9 having a plurality of U-shaped impact absorbing portions 7 connected at both ends to the connecting members 6A and 6B. Since the fuel is disposed between the spent fuel assembly 9 and the lid member 4A attached to the container body 2 in the nuclear fuel storage container 1, the nuclear fuel storage container 1 falls from a high place and those spent fuel assemblies are disposed. 9 can absorb the impact force applied to the lid member 4A by deformation of each impact absorbing portion 7 of the impact absorbing device 9, and damage the spent fuel assembly 9 and the lid member 4A when the nuclear fuel storage container 1 is dropped. Can be prevented.

また、その落下時に生じる各衝撃吸収部７の変形は、特開２０１１−１３０５号公報および特開２００２−３４１０８５号公報に比べて、前述したように、変形が進行する方向に指向性を有する、すなわち、連結部材６Ａ，６Ｂの長手方向と直交する方向（衝撃吸収部７の側壁部の肉厚方向）で進行するので、変形した衝撃吸収部７と、バスケット３、およびハンドル１３およびチャンネルボックス１５等の使用済燃料集合体９との干渉を回避することができる。このため、落下した核燃料収納容器１から蓋部材４Ｃ，４Ｂ，４Ａを順次取り外すことにより、核燃料収納容器１内の使用済燃料集合体９を容易に外部に取り出すことができる。   Further, the deformation of each shock absorbing portion 7 that occurs at the time of dropping has directivity in the direction in which the deformation progresses, as described above, as compared to Japanese Patent Application Laid-Open Nos. 2011-1305 and 2002-341085. That is, since it proceeds in a direction orthogonal to the longitudinal direction of the connecting members 6A and 6B (thickness direction of the side wall portion of the shock absorbing portion 7), the deformed shock absorbing portion 7, the basket 3, the handle 13, and the channel box 15 Thus, interference with the spent fuel assembly 9 can be avoided. For this reason, the spent fuel assembly 9 in the nuclear fuel storage container 1 can be easily taken out by detaching the lid members 4C, 4B, 4A sequentially from the dropped nuclear fuel storage container 1.

また、各衝撃吸収装置５が連結部６Ａ，６Ｂに複数の衝撃吸収部７を設けているので、各衝撃吸収部７を一列に配置された複数の使用済燃料集合体９に対向させて配置することができ、複数の衝撃吸収部７の配置作業を効率的に行うことができる。   Further, since each shock absorbing device 5 is provided with a plurality of shock absorbing portions 7 in the connecting portions 6A and 6B, each shock absorbing portion 7 is arranged to face a plurality of spent fuel assemblies 9 arranged in a row. It is possible to perform the arrangement work of the plurality of shock absorbing portions 7 efficiently.

使用済燃料集合体９をバスケット３にて画定された収納領域内に配置するとき、使用済燃料集合体９のハンドル１３が、図６に示す１３Ａの向きになる場合がある。本実施例に用いられる衝撃吸収装置５は、ハンドル１３の向きに関係なく、各衝撃吸収部７を、使用済燃料集合体９、具体的には、上部タイプレート１２の上面に対向させて配置することができる。   When the spent fuel assembly 9 is disposed within the storage area defined by the basket 3, the handle 13 of the spent fuel assembly 9 may be in the direction 13A shown in FIG. The shock absorbing device 5 used in the present embodiment is arranged such that each shock absorbing portion 7 faces the spent fuel assembly 9, specifically, the upper surface of the upper tie plate 12, regardless of the direction of the handle 13. can do.

本発明の他の実施例である実施例２の核燃料収納容器を、図８〜図１０を用いて説明する。本実施例の核燃料収納容器１Ａは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ａに替えた構成を有する。核燃料収納容器１Ａの他の構成は核燃料収納容器１と同じである。   The nuclear fuel storage container of Example 2 which is another Example of this invention is demonstrated using FIGS. 8-10. The nuclear fuel storage container 1A of the present embodiment has a configuration in which the impact absorbing device 5 is replaced with the impact absorbing device 5A in the nuclear fuel storage container 1 of the first embodiment. The other configuration of the nuclear fuel storage container 1A is the same as that of the nuclear fuel storage container 1.

衝撃吸収装置５Ａは、連結部６およびＵ字状の複数の衝撃吸収部７Ａを有する（図１０参照）。各衝撃吸収部７Ａは両端部が連結部６に連結されている。隣り合う衝撃収納部７Ａは、連結部６によって連結される。各衝撃吸収部７Ａは、下端部に、曲面を有する曲り部１６Ａを形成している。衝撃吸収部７Ａにおいて、連結部６Ａと曲り部１６Ａの間の部分および連結部６Ｂと曲り部１６Ａの間の部分はそれぞれ側壁部である。衝撃吸収装置５Ａにおいて、衝撃吸収部７の側壁部の幅方向が、連結部６Ａ（または連結部６Ｂ）の長手方向と直交している。このような構成を有する衝撃吸収装置５Ａは、一枚の平板を曲げて製造され、連結部６の幅と衝撃吸収部７Ａの幅は同じである。   The shock absorbing device 5A includes a connecting portion 6 and a plurality of U-shaped shock absorbing portions 7A (see FIG. 10). Each shock absorbing portion 7A is connected to the connecting portion 6 at both ends. Adjacent impact storage portions 7 </ b> A are connected by a connecting portion 6. Each impact absorbing portion 7A has a curved portion 16A having a curved surface at the lower end. In the impact absorbing portion 7A, the portion between the connecting portion 6A and the bent portion 16A and the portion between the connecting portion 6B and the bent portion 16A are side wall portions. In the shock absorbing device 5A, the width direction of the side wall portion of the shock absorbing portion 7 is orthogonal to the longitudinal direction of the connecting portion 6A (or connecting portion 6B). The shock absorbing device 5A having such a configuration is manufactured by bending a single flat plate, and the width of the connecting portion 6 and the width of the shock absorbing portion 7A are the same.

所定体数の使用済燃料集合体９が核燃料収納容器１Ａの容器本体２内のバスケット３に形成された各収納領域に順番に収納される。これらの収納が終了した後、衝撃吸収装置５Ａが該当する複数の使用済燃料集合体９の上に置かれる。衝撃吸収装置５Ａは、連結部６が使用済燃料集合体９のハンドル１３と並行になるように、容器本体２内に配置される。衝撃吸収装置５Ａは、容器本体２内で、使用済燃料集合体９の対角線方向に配置される（図９参照）。衝撃吸収装置５Ａの各衝撃吸収部７Ａの曲り部１６Ａの下面が使用済燃料集合体９の上部タイプレート１２の上面に接触している（図８参照）。複数の衝撃吸収装置５Ａが使用済燃料集合体９の対角線方向で各使用済燃料集合体９の上に置かれた後、蓋部材４Ａ，４Ｂ，４Ｃが、順番に、容器本体２にそれぞれ取り外し可能に取り付けられる。このようにして、使用済燃料集合体９が収納された容器本体２が蓋部材４Ａ，４Ｂ，４Ｃによって密封される。   A predetermined number of spent fuel assemblies 9 are stored in order in each storage region formed in the basket 3 in the container body 2 of the nuclear fuel storage container 1A. After these storages are completed, the shock absorbing device 5A is placed on the corresponding spent fuel assemblies 9. The shock absorbing device 5 </ b> A is disposed in the container body 2 so that the connecting portion 6 is parallel to the handle 13 of the spent fuel assembly 9. The shock absorbing device 5A is arranged in the diagonal direction of the spent fuel assembly 9 in the container body 2 (see FIG. 9). The lower surface of the bent portion 16A of each shock absorbing portion 7A of the shock absorbing device 5A is in contact with the upper surface of the upper tie plate 12 of the spent fuel assembly 9 (see FIG. 8). After the plurality of shock absorbing devices 5A are placed on each spent fuel assembly 9 in the diagonal direction of the spent fuel assembly 9, the lid members 4A, 4B, 4C are sequentially removed from the container body 2 respectively. Installed as possible. In this way, the container body 2 in which the spent fuel assembly 9 is stored is sealed by the lid members 4A, 4B, 4C.

使用済燃料集合体９が収納されて蓋部材４Ａ，４Ｂ，４Ｃによって密封されている核燃料収納容器１Ａ内において、各衝撃吸収装置５Ａは使用済燃料集合体９と蓋部材４Ａの間に配置されている。使用済燃料集合体９を収納した核燃料収納容器１Ａが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ａ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力が、各衝撃吸収装置５Ａに設けられたそれぞれの衝撃吸収部７Ａの変形によって吸収される。板状の衝撃吸収部７ＡがＵ字状になっているので、衝撃力により変形する際には、衝撃吸収部７Ａは、衝撃吸収部７Ａの幅方向（連結部６の長手方向と直交する方向）ではなく、連結部６の長手方向（矢印８の方向）である使用済燃料集合体９の対角線方向に変形が進行する。   In the nuclear fuel storage container 1A in which the spent fuel assembly 9 is housed and sealed by the lid members 4A, 4B, 4C, each impact absorbing device 5A is disposed between the spent fuel assembly 9 and the lid member 4A. ing. When the nuclear fuel storage container 1A storing the spent fuel assemblies 9 falls from a high position with the lid member facing down, the impact force of the spent fuel assemblies 9 in the nuclear fuel storage container 1A on the lid member 4A is It is absorbed by the deformation of each shock absorbing portion 7A provided in each shock absorbing device 5A. Since the plate-like impact absorbing portion 7A is U-shaped, when it is deformed by an impact force, the impact absorbing portion 7A is arranged in the width direction of the impact absorbing portion 7A (the direction orthogonal to the longitudinal direction of the connecting portion 6). ) Rather than in the diagonal direction of the spent fuel assembly 9, which is the longitudinal direction of the connecting portion 6 (the direction of the arrow 8).

本実施例は実施例１で生じる各効果を得ることができる。前述したように、衝撃吸収部７Ａの変形が進行する方向が使用済燃料集合体９の対角線方向になるため、衝撃吸収部７Ａと、バスケット３、ハンドル１３およびチャンネルボックス１５のそれぞれとの間に形成する間隙ｄの幅は、実施例１における間隙ｄの幅よりも長くなる。このため、核燃料収納容器１Ａでは、変形した衝撃吸収部７Ａがそれらの構造部材と干渉する確率がさらに低減される。   In the present embodiment, each effect produced in the first embodiment can be obtained. As described above, the direction in which the deformation of the shock absorbing portion 7A proceeds is the diagonal direction of the spent fuel assembly 9, and therefore, between the shock absorbing portion 7A and each of the basket 3, the handle 13, and the channel box 15. The width of the gap d to be formed is longer than the width of the gap d in the first embodiment. For this reason, in the nuclear fuel storage container 1A, the probability that the deformed shock absorbing portion 7A interferes with those structural members is further reduced.

衝撃吸収部７Ａは一枚の細長い板材を曲げて製造することができるので、実施例１で用いられる衝撃吸収部７よりも必要とする材料の量を低減することができる。   Since the shock absorbing portion 7A can be manufactured by bending a single thin plate, the amount of material required can be reduced as compared with the shock absorbing portion 7 used in the first embodiment.

本発明の他の実施例である実施例３の核燃料収納容器を、図１１を用いて説明する。本実施例の核燃料収納容器１Ｂは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ｂに替えた構成を有する。核燃料収納容器１Ｂの他の構成は核燃料収納容器１と同じである。   A nuclear fuel storage container according to embodiment 3, which is another embodiment of the present invention, will be described with reference to FIG. The nuclear fuel storage container 1B of the present embodiment has a configuration in which the impact absorbing device 5 is replaced with the impact absorbing device 5B in the nuclear fuel storage container 1 of the first embodiment. The other configuration of the nuclear fuel storage container 1B is the same as that of the nuclear fuel storage container 1.

衝撃吸収装置５Ｂは、連結部６Ａ，６ＢおよびＵ字状の複数の衝撃吸収部７Ｂを有する。各衝撃吸収部７Ｂの両端部は、衝撃吸収装置５と同様に、連結部６Ａ，６Ｂに連結されている。衝撃吸収部７Ｂは下端部に平面状の曲り部１６Ｂを形成しており、衝撃吸収部７Ｂの対向する両側壁部（連結部６Ａ，６Ｂのそれぞれと曲り部１６Ｂの間の部分）は内側および外側に交互に折り曲げられた蛇腹状になっている。   The shock absorbing device 5B has connecting portions 6A and 6B and a plurality of U-shaped shock absorbing portions 7B. Both end portions of each shock absorbing portion 7B are connected to the connecting portions 6A and 6B in the same manner as the shock absorbing device 5. The shock absorbing portion 7B has a flat bent portion 16B at the lower end, and the opposite side wall portions of the shock absorbing portion 7B (the portion between each of the connecting portions 6A and 6B and the bent portion 16B) are inside and It has a bellows shape that is folded alternately on the outside.

衝撃吸収装置５Ｂは、実施例１の核燃料収納容器１と同様に、容器本体２内に収納された使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置される。衝撃吸収装置５Ｂの各衝撃吸収部７Ｂは、該当する使用済燃料集合体９のチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入され、衝撃吸収部の曲り部１６Ｂが使用済燃料集合体９の上部タイプレート１２の上面に対向している。   Similar to the nuclear fuel storage container 1 of the first embodiment, the shock absorbing device 5B is disposed between the spent fuel assembly 9 stored in the container main body 2 and the lid member 4A attached to the container main body 2. Each shock absorbing portion 7B of the shock absorbing device 5B is inserted inside the channel box 15 at the upper end of the channel box 15 of the corresponding spent fuel assembly 9, and the bent portion 16B of the shock absorbing portion is used in the spent fuel assembly. 9 is opposed to the upper surface of the upper tie plate 12.

本実施例は実施例１で生じる各効果を得ることができる。   In the present embodiment, each effect produced in the first embodiment can be obtained.

使用済燃料集合体９を収納した核燃料収納容器１Ｂが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ｂ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力が、各衝撃吸収装置５Ｂに設けられたそれぞれの衝撃吸収部７Ｂの変形によって吸収される。このとき、衝撃吸収部７Ｂの変形は、曲り部１６Ｂから連結部６Ａ，６Ｂに向かう方向（図１１に示す矢印８Ａの方向）における変形が主となる。これは、衝撃吸収部７Ｂの側壁部が蛇腹状になっており、衝撃吸収部７Ｂでは矢印８Ａの方向で変形が生じやすいためである。連結部６Ａ，６Ｂの長手方向と直交する方向での変形量が、実施例１で用いられる衝撃吸収装置５の衝撃吸収部７の矢印８の方向での変形量および実施例２で用いられる衝撃吸収装置５Ａの衝撃吸収部７Ａの矢印８の方向での変形量よりも著しく低減される。このため、本実施例における変形した衝撃吸収部７Ｂと、バスケット３、ハンドル１３およびチャンネルボックス１５のそれぞれと干渉する確率がさらに低減される。   When the nuclear fuel storage container 1B storing the spent fuel assemblies 9 falls from a high position with the lid member facing down, the impact force of the spent fuel assemblies 9 in the nuclear fuel storage container 1B on the lid member 4A is It is absorbed by the deformation of each shock absorbing portion 7B provided in each shock absorbing device 5B. At this time, the deformation of the shock absorbing portion 7B is mainly in the direction from the bent portion 16B toward the connecting portions 6A and 6B (the direction of the arrow 8A shown in FIG. 11). This is because the side wall portion of the shock absorbing portion 7B has a bellows shape, and the shock absorbing portion 7B is likely to be deformed in the direction of the arrow 8A. The amount of deformation in the direction orthogonal to the longitudinal direction of the connecting portions 6A and 6B is the amount of deformation in the direction of the arrow 8 of the shock absorbing portion 7 of the shock absorbing device 5 used in the first embodiment and the shock used in the second embodiment. The amount of deformation in the direction of the arrow 8 of the shock absorbing portion 7A of the absorbing device 5A is significantly reduced. For this reason, the probability of interfering with the deformed shock absorbing portion 7B in the present embodiment and each of the basket 3, the handle 13, and the channel box 15 is further reduced.

本発明の他の実施例である実施例４の核燃料収納容器を、図１２を用いて説明する。本実施例の核燃料収納容器１Ｃは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ｃに替えた構成を有する。核燃料収納容器１Ｃの他の構成は核燃料収納容器１と同じである。   The nuclear fuel storage container of Example 4 which is another Example of this invention is demonstrated using FIG. The nuclear fuel storage container 1C of the present embodiment has a configuration in which the impact absorbing device 5 in the nuclear fuel storage container 1 of the first embodiment is replaced with an impact absorbing device 5C. Other configurations of the nuclear fuel storage container 1 </ b> C are the same as those of the nuclear fuel storage container 1.

衝撃吸収装置５Ｃは、実施例１に用いられる衝撃吸収装置５と同様に、連結部６Ａ，６Ｂ、および一端部が連結部６Ａに連結されて他端部が連結部６Ｂに連結されるＵ字状の衝撃吸収部７Ｃを有する。衝撃吸収部７Ｃの下端部には、曲面を有する曲り部１６Ｃが形成されている。衝撃吸収装置５Ｃは、衝撃吸収装置５とは異なり、衝撃吸収部７Ｃの対向する側壁部１７Ａおよび側壁部１７Ｂは幅が異なっている。側壁部１７Ａの幅は側壁部１７Ｂの幅よりも狭くなっている。衝撃吸収部７Ｃにおいて、側壁部１７Ａは連結部６Ａと曲り部１６Ｂの間の部分であり、側壁部１７Ｂは連結部６Ｂと曲り部１６Ｂの間の部分である。   Similarly to the shock absorbing device 5 used in the first embodiment, the shock absorbing device 5C is a U-shape in which the connecting portions 6A and 6B and one end are connected to the connecting portion 6A and the other end is connected to the connecting portion 6B. -Like shock absorbing portion 7C. A bent portion 16C having a curved surface is formed at the lower end of the shock absorbing portion 7C. The shock absorbing device 5C differs from the shock absorbing device 5 in that the side wall portions 17A and the side wall portions 17B facing each other of the shock absorbing portion 7C have different widths. The width of the side wall portion 17A is narrower than the width of the side wall portion 17B. In the shock absorbing portion 7C, the side wall portion 17A is a portion between the connecting portion 6A and the bent portion 16B, and the side wall portion 17B is a portion between the connecting portion 6B and the bent portion 16B.

衝撃吸収装置５Ｃは、実施例１の核燃料収納容器１と同様に、容器本体２内に収納された使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置される。衝撃吸収装置５Ｃの各衝撃吸収部７Ｃは、該当する使用済燃料集合体９のチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入され、衝撃吸収部の曲り部１６Ｃが使用済燃料集合体９の上部タイプレート１２の上面に対向している。   Similar to the nuclear fuel storage container 1 of the first embodiment, the shock absorbing device 5C is disposed between the spent fuel assembly 9 stored in the container main body 2 and the lid member 4A attached to the container main body 2. Each shock absorbing portion 7C of the shock absorbing device 5C is inserted inside the channel box 15 at the upper end of the channel box 15 of the corresponding spent fuel assembly 9, and the bent portion 16C of the shock absorbing portion is used in the spent fuel assembly. 9 is opposed to the upper surface of the upper tie plate 12.

本実施例は実施例１で生じる各効果を得ることができる。   In the present embodiment, each effect produced in the first embodiment can be obtained.

使用済燃料集合体９を収納した核燃料収納容器１Ｃが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ｃ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力が、各衝撃吸収装置５Ｃに設けられたそれぞれの衝撃吸収部７Ｃの変形によって吸収される。このとき、側壁部１７Ａの幅が側壁部１７Ｂの幅よりも狭くなっているので、衝撃荷重を受けたときにおける衝撃吸収部７Ｃの変形は、側壁部１７Ｂよりも側壁部１７Ａで先に生じる（図１３参照）。このため、衝撃吸収部７Ｃは、連結部６Ａ，６Ｂと直交する方向にさらに変形しやすくなる。   When the nuclear fuel storage container 1C storing the spent fuel assemblies 9 falls from a high place with the lid member facing down, the impact force of the spent fuel assemblies 9 in the nuclear fuel storage container 1C on the lid member 4A is It is absorbed by the deformation of each impact absorbing portion 7C provided in each impact absorbing device 5C. At this time, since the width of the side wall portion 17A is narrower than the width of the side wall portion 17B, the deformation of the shock absorbing portion 7C when receiving an impact load occurs earlier in the side wall portion 17A than the side wall portion 17B ( (See FIG. 13). For this reason, the shock absorbing portion 7C is further easily deformed in the direction orthogonal to the connecting portions 6A and 6B.

本発明の他の実施例である実施例５の核燃料収納容器を、図１４を用いて説明する。本実施例の核燃料収納容器１Ｄは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ｄに替えた構成を有する。核燃料収納容器１Ｄの他の構成は核燃料収納容器１と同じである。   The nuclear fuel storage container of Example 5 which is another Example of this invention is demonstrated using FIG. The nuclear fuel storage container 1D of the present embodiment has a configuration in which the impact absorbing device 5 is replaced with the impact absorbing device 5D in the nuclear fuel storage container 1 of the first embodiment. Other configurations of the nuclear fuel storage container 1D are the same as those of the nuclear fuel storage container 1.

衝撃吸収装置５Ｄは、連結部６Ａ，６ＢおよびＵ字状の複数の衝撃吸収部７Ｄを有する。各衝撃吸収部７Ｄの両端部は、衝撃吸収装置５と同様に、連結部６Ａ，６Ｂに連結されている。衝撃吸収部７Ｄは、衝撃吸収部７Ｃと同様に、下端部に平面状の曲り部１６Ｄを形成している。衝撃吸収部７Ｄの対向する両側壁部（連結部６Ａ，６Ｂのそれぞれと曲り部１６Ｄの間の部分）は、衝撃吸収部７Ｃと異なり、平板状になっている。   The shock absorbing device 5D includes connecting portions 6A and 6B and a plurality of U-shaped shock absorbing portions 7D. Both end portions of each shock absorbing portion 7D are connected to the connecting portions 6A and 6B in the same manner as the shock absorbing device 5. The shock absorbing portion 7D has a planar bent portion 16D formed at the lower end, similarly to the shock absorbing portion 7C. Unlike the shock absorbing portion 7C, the opposite side wall portions (portions between the connecting portions 6A and 6B and the bent portion 16D) of the shock absorbing portion 7D have a flat plate shape.

衝撃吸収装置５Ｄは、実施例１の核燃料収納容器１と同様に、容器本体２内に収納された使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置される。衝撃吸収装置５Ｄの各衝撃吸収部７Ｄは、該当する使用済燃料集合体９のチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入され、衝撃吸収部の曲り部１６Ｄが使用済燃料集合体９の上部タイプレート１２の上面に対向している。   Similar to the nuclear fuel storage container 1 of the first embodiment, the shock absorbing device 5D is disposed between the spent fuel assembly 9 stored in the container main body 2 and the lid member 4A attached to the container main body 2. Each shock absorbing portion 7D of the shock absorbing device 5D is inserted inside the channel box 15 at the upper end portion of the channel box 15 of the corresponding spent fuel assembly 9, and the bent portion 16D of the shock absorbing portion is used in the spent fuel assembly. 9 is opposed to the upper surface of the upper tie plate 12.

使用済燃料集合体９を収納した核燃料収納容器１Ｄが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ｄ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力は、各衝撃吸収装置５Ｄに設けられたそれぞれの衝撃吸収部７Ｄが連結部６Ａ，６Ｂの長手方向と直交する方向（矢印８の方向）に変形することによって吸収される。   When the nuclear fuel storage container 1D storing the spent fuel assemblies 9 falls from a high place with the lid member facing down, the impact force of each spent fuel assembly 9 in the nuclear fuel storage container 1D on the lid member 4A is Each shock absorbing portion 7D provided in each shock absorbing device 5D is absorbed by being deformed in a direction (direction of arrow 8) perpendicular to the longitudinal direction of the connecting portions 6A and 6B.

本実施例は実施例１で生じる各効果を得ることができる。   In the present embodiment, each effect produced in the first embodiment can be obtained.

本発明の他の実施例である実施例６の核燃料収納容器を、図１５を用いて説明する。本実施例の核燃料収納容器１Ｅは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ｅに替えた構成を有する。核燃料収納容器１Ｅの他の構成は核燃料収納容器１と同じである。   The nuclear fuel storage container of Example 6 which is another Example of this invention is demonstrated using FIG. The nuclear fuel storage container 1E of the present embodiment has a configuration in which the impact absorbing device 5 is replaced with the impact absorbing device 5E in the nuclear fuel storage container 1 of the first embodiment. Other configurations of the nuclear fuel storage container 1E are the same as those of the nuclear fuel storage container 1.

衝撃吸収装置５Ｅは、連結部６および複数の衝撃吸収部７Ｅを有する。各衝撃吸収部７Ｅの端部は連結部６に連結されている。衝撃吸収部７Ｅは、下端部に曲面を有する曲り部１６Ｅを形成しており、実施例１に用いられる衝撃吸収装置５の衝撃吸収部７と異なり、１つの側壁部（連結部６と曲り部１６Ｅの間の部分）を有している。   The shock absorbing device 5E has a connecting part 6 and a plurality of shock absorbing parts 7E. The end of each shock absorbing part 7E is connected to the connecting part 6. The shock absorbing portion 7E has a curved portion 16E having a curved surface at the lower end, and unlike the shock absorbing portion 7 of the shock absorbing device 5 used in the first embodiment, one side wall portion (the connecting portion 6 and the bent portion). 16E).

衝撃吸収装置５Ｅは、実施例１の核燃料収納容器１と同様に、容器本体２内に収納された使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置される。衝撃吸収装置５Ｅの各衝撃吸収部７Ｅは、該当する使用済燃料集合体９のチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入され、衝撃吸収部の曲り部１６Ｅが使用済燃料集合体９の上部タイプレート１２の上面に対向している。   Similar to the nuclear fuel storage container 1 of the first embodiment, the shock absorbing device 5E is disposed between the spent fuel assembly 9 stored in the container main body 2 and the lid member 4A attached to the container main body 2. Each shock absorbing portion 7E of the shock absorbing device 5E is inserted inside the channel box 15 at the upper end portion of the channel box 15 of the corresponding spent fuel assembly 9, and the bent portion 16E of the shock absorbing portion is used in the spent fuel assembly. 9 is opposed to the upper surface of the upper tie plate 12.

使用済燃料集合体９を収納した核燃料収納容器１Ｅが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ｅ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力は、各衝撃吸収装置５Ｅに設けられたそれぞれの衝撃吸収部７Ｅが連結部６Ａ，６Ｂの長手方向と直交する方向（矢印８の方向）に変形することによって吸収される。   When the nuclear fuel storage container 1E storing the spent fuel assemblies 9 falls from a high position with the lid member facing down, the impact force of each spent fuel assembly 9 in the nuclear fuel storage container 1E on the lid member 4A is Each shock absorbing portion 7E provided in each shock absorbing device 5E is absorbed by being deformed in a direction (direction of arrow 8) perpendicular to the longitudinal direction of the connecting portions 6A, 6B.

本実施例は実施例１で生じる各効果を得ることができる。衝撃吸収部７Ｅが側壁部を１つしか有しないので、衝撃吸収装置５Ｅは衝撃吸収装置５に比べて製造に必要な材料の量を低減することができる。   In the present embodiment, each effect produced in the first embodiment can be obtained. Since the shock absorbing portion 7E has only one side wall portion, the shock absorbing device 5E can reduce the amount of material required for manufacturing compared to the shock absorbing device 5.

本発明の他の実施例である実施例７の核燃料収納容器を、図１６を用いて説明する。本実施例の核燃料収納容器１Ｆは、実施例１の核燃料収納容器１において衝撃吸収装置５を衝撃吸収装置５Ｆに替えた構成を有する。核燃料収納容器１Ｆの他の構成は核燃料収納容器１と同じである。   The nuclear fuel storage container of Example 7 which is another Example of this invention is demonstrated using FIG. The nuclear fuel storage container 1F of the present embodiment has a configuration in which the impact absorbing device 5 is replaced with the impact absorbing device 5F in the nuclear fuel storage container 1 of the first embodiment. The other configuration of the nuclear fuel storage container 1F is the same as that of the nuclear fuel storage container 1.

衝撃吸収装置５Ｆは、連結部６Ａ，６ＢおよびＵ字状の複数の衝撃吸収部７Ｆを有する。各衝撃吸収部７Ｆの両端部は、衝撃吸収装置５と同様に、連結部６Ａ，６Ｂに連結されている。衝撃吸収部７Ｆは、衝撃吸収部７と同様に、下端部に曲面を有する曲り部１６Ｆを形成している。衝撃吸収部７Ｆの対向する両側壁部（連結部６Ａ，６Ｂのそれぞれと曲り部１６Ｄの間の部分）には、それぞれ、連結部６Ａ，６Ｂの長手方向に伸びる切欠き部１８が形成されている。衝撃吸収部７Ｆにおいて、１つの切欠き部１８は連結部６Ａと曲り部１６Ｄの間の側壁部の側面のうち連結部６Ｂと曲り部１６Ｄの間の側壁部に面していない側面に形成され、他の切欠き部１８は連結部６Ｂと曲り部１６Ｄの間の側壁部の側面で連結部６Ａと曲り部１６Ｄの間の側壁部に面している側面に形成される。このため、両方の切欠き部１８は、同じ方向に向かって開放されている。衝撃吸収部７Ｆの切欠き部１８の肉厚は、衝撃吸収部７Ｆの他の部分の肉厚よりも薄くなっている。   The shock absorbing device 5F includes connecting portions 6A and 6B and a plurality of U-shaped shock absorbing portions 7F. Both ends of each shock absorbing portion 7F are connected to the connecting portions 6A and 6B in the same manner as the shock absorbing device 5. The shock absorbing portion 7F forms a bent portion 16F having a curved surface at the lower end, similarly to the shock absorbing portion 7. Notched portions 18 extending in the longitudinal direction of the connecting portions 6A and 6B are formed in opposite side wall portions of the shock absorbing portion 7F (portions between the connecting portions 6A and 6B and the bent portion 16D), respectively. Yes. In the shock absorbing portion 7F, one notch portion 18 is formed on the side surface of the side wall portion between the connecting portion 6A and the bent portion 16D that does not face the side wall portion between the connecting portion 6B and the bent portion 16D. The other notch portion 18 is formed on the side surface of the side wall portion between the connecting portion 6B and the bent portion 16D and on the side surface facing the side wall portion between the connecting portion 6A and the bent portion 16D. For this reason, both the notch parts 18 are open | released toward the same direction. The thickness of the cutout portion 18 of the shock absorbing portion 7F is thinner than the thickness of other portions of the shock absorbing portion 7F.

衝撃吸収装置５Ｆは、実施例１の核燃料収納容器１と同様に、容器本体２内に収納された使用済燃料集合体９と容器本体２に取り付けられた蓋部材４Ａの間に配置される。衝撃吸収装置５Ｆの各衝撃吸収部７Ｆは、該当する使用済燃料集合体９のチャンネルボックス１５の上端部でチャンネルボックス１５の内側に挿入され、衝撃吸収部の曲り部１６Ｆが使用済燃料集合体９の上部タイプレート１２の上面に対向している。   Similarly to the nuclear fuel storage container 1 of the first embodiment, the shock absorbing device 5F is disposed between the spent fuel assembly 9 stored in the container body 2 and the lid member 4A attached to the container body 2. Each shock absorbing portion 7F of the shock absorbing device 5F is inserted inside the channel box 15 at the upper end of the channel box 15 of the corresponding spent fuel assembly 9, and the bent portion 16F of the shock absorbing portion is used in the spent fuel assembly. 9 is opposed to the upper surface of the upper tie plate 12.

使用済燃料集合体９を収納した核燃料収納容器１Ｆが蓋部材を下側にして高所から落下したとき、核燃料収納容器１Ｆ内の各使用済燃料集合体９による蓋部材４Ａに対する衝撃力は、各衝撃吸収装置５Ｆに設けられたそれぞれの衝撃吸収部７Ｆが連結部６Ａ，６Ｂの長手方向と直交する方向である矢印８の方向に変形することによって吸収される。   When the nuclear fuel storage container 1F storing the spent fuel assemblies 9 falls from a high position with the lid member facing down, the impact force of each spent fuel assembly 9 in the nuclear fuel storage container 1F on the lid member 4A is Each shock absorbing portion 7F provided in each shock absorbing device 5F is absorbed by being deformed in the direction of the arrow 8 which is a direction orthogonal to the longitudinal direction of the connecting portions 6A and 6B.

本実施例は実施例１で生じる各効果を得ることができる。   In the present embodiment, each effect produced in the first embodiment can be obtained.

実施例１および実施例３〜７では、使用済燃料集合体９が収納された核燃料収納容器が蓋部材を下側にして落下したとき、使用済燃料集合体９によって蓋部材４Ａが受ける衝撃力により、それぞれの衝撃吸収装置の衝撃吸収部が、衝撃吸収部の連結部の長手方向と直交する方向、すなわち、衝撃吸収部の肉厚方向に変形し、各衝撃吸収部は衝撃吸収部の幅方向には変形しない。実施例２においても、使用済燃料集合体９が収納された核燃料収納容器が蓋部材を下側にして落下したとき、使用済燃料集合体９によって蓋部材４Ａが受ける衝撃力により、それぞれの衝撃吸収装置の衝撃吸収部が、衝撃吸収部の連結部の長手方向、すなわち、衝撃吸収部の肉厚方向に変形し、各衝撃吸収部は衝撃吸収部の幅方向には変形しない。   In Example 1 and Examples 3 to 7, when the nuclear fuel storage container in which the spent fuel assembly 9 is stored falls with the lid member facing downward, the impact force that the lid member 4A receives by the spent fuel assembly 9 Thus, the shock absorbing portion of each shock absorbing device is deformed in the direction perpendicular to the longitudinal direction of the connecting portion of the shock absorbing portion, that is, in the thickness direction of the shock absorbing portion, and each shock absorbing portion is the width of the shock absorbing portion. Does not deform in the direction. Also in the second embodiment, when the nuclear fuel storage container in which the spent fuel assembly 9 is stored falls with the lid member facing downward, the impact force received by the lid member 4A by the spent fuel assembly 9 causes each impact. The shock absorbing portion of the absorbing device is deformed in the longitudinal direction of the connecting portion of the shock absorbing portion, that is, the thickness direction of the shock absorbing portion, and each shock absorbing portion is not deformed in the width direction of the shock absorbing portion.

各実施例で用いられる衝撃吸収装置は、延性が高い金属または樹脂材料により構成することが望ましい。アルミニウムなどの軽金属または耐熱性のプラスチックを用いて衝撃吸収装置を製造することにより、さらに軽量な衝撃吸収装置を得ることができる。   It is desirable that the impact absorbing device used in each embodiment is made of a highly ductile metal or resin material. By manufacturing a shock absorber using a light metal such as aluminum or a heat-resistant plastic, a lighter shock absorber can be obtained.

実施例２〜７の各核燃料収納容器は、実施例１の各燃料収納容器１と同様に、加圧水型原子炉等の他の原子炉で発生する使用済燃料集合体を収納する核燃料収納容器にも適用することができる。また、実施例１〜７の各核燃料収納容器は、使用済燃料集合体９だけでなく、製造後の新燃料集合体の輸送にも適用できる。   Each of the nuclear fuel storage containers of Examples 2 to 7 is a nuclear fuel storage container that stores spent fuel assemblies generated in other nuclear reactors such as a pressurized water reactor, similarly to each of the fuel storage containers 1 of Example 1. Can also be applied. Moreover, each nuclear fuel storage container of Examples 1-7 can be applied not only to the spent fuel assembly 9 but also to transportation of a new fuel assembly after manufacture.

１，１Ａ，１Ｂ，１Ｃ，１Ｄ，１Ｅ，１Ｆ…核燃料収納容器、２…容器本体、３…バスケット、４Ａ，４Ｂ，４Ｃ…蓋部材、５，５Ａ，５Ｂ，５Ｃ，５Ｄ，５Ｅ，５Ｆ…衝撃吸収装置、６，６Ａ，６Ｂ…連結部、７，７Ａ，７Ｂ，７Ｃ，７Ｄ，７Ｅ，７Ｆ…衝撃吸収部、９…使用済燃料集合体、１０…燃料棒、１１…下部タイプレート、１２…上部タイプレート、１３…ハンドル、１５…チャンネルボックス、１６，１６Ａ，１６Ｂ，１６Ｃ，１６Ｄ，１６Ｅ，１６Ｆ…曲り部、１７Ａ，１７Ｂ…側壁部、１８…切欠き部。   1, 1A, 1B, 1C, 1D, 1E, 1F ... Nuclear fuel storage container, 2 ... Container body, 3 ... Basket, 4A, 4B, 4C ... Lid member, 5, 5A, 5B, 5C, 5D, 5E, 5F ... Shock absorbing device, 6, 6A, 6B ... connecting part, 7, 7A, 7B, 7C, 7D, 7E, 7F ... shock absorbing part, 9 ... spent fuel assembly, 10 ... fuel rod, 11 ... lower tie plate, DESCRIPTION OF SYMBOLS 12 ... Upper tie plate, 13 ... Handle, 15 ... Channel box, 16, 16A, 16B, 16C, 16D, 16E, 16F ... Bending part, 17A, 17B ... Side wall part, 18 ... Notch part.

Claims (7)

下端部が封鎖されて上端部が開放された容器本体と、前記容器本体内に設置されて燃料集合体の複数の収納領域を画定するバスケットと、前記容器本体の上端部に取り外し可能に取り付けられる蓋部材と、それぞれの前記収納領域内に燃料集合体が収納された状態で、前記燃料集合体と前記蓋部材の間に配置される衝撃吸収装置とを備え、
前記衝撃吸収装置が、連結部、および前記連結部に連結される複数の衝撃吸収部を有し、
それぞれの衝撃吸収部が、前記連結部に連結される板状の側壁部および前記側壁部に連なって前記燃料集合体と対向する曲り部を含んでおり、
前記衝撃吸収装置が、一列に配置された複数の前記収納領域に沿って伸びる一対の前記連結部を有し、前記衝撃吸収部がＵ字状をしており、前記衝撃吸収部の対向する前記側壁部のそれぞれの端部が前記一対の連結部に別々に連結され、前記曲り部がこれらの側壁部につながっていることを特徴とする核燃料収納容器。 A container body whose lower end is sealed and whose upper end is opened, a basket which is installed in the container body and defines a plurality of storage areas of the fuel assembly, and is detachably attached to the upper end of the container body A lid member, and an impact absorbing device disposed between the fuel assembly and the lid member in a state where the fuel assembly is housed in each of the housing regions,
The shock absorbing device has a connecting portion and a plurality of shock absorbing portions connected to the connecting portion,
Each impact absorbing portion includes a plate-like side wall portion connected to the connecting portion, and a bent portion that is continuous with the side wall portion and faces the fuel assembly,
The shock absorbing device has a pair of the connecting portions extending along a plurality of the storage areas arranged in a line , the shock absorbing portion has a U shape, and the shock absorbing portions face each other. A nuclear fuel storage container, wherein each end portion of the side wall portion is separately connected to the pair of connecting portions, and the bent portion is connected to the side wall portions. 前記側壁部の幅方向が、前記一列に配置された複数の収納領域が伸びる方向である前記連結部の長手方向になっている請求項１に記載の核燃料収納容器。 The width direction of the side wall portion, the nuclear fuel container according to claim 1 which is in the longitudinal direction of the a direction in which the plurality of storage areas arranged in a row extending the connection portion. 前記曲り部が曲面を有している請求項１または２に記載の核燃料収納容器。 Nuclear fuel container according to claim 1 or 2, wherein the bent portion has a curved surface. 前記側壁部が蛇腹状になっている請求項１に記載の核燃料収納容器。 The nuclear fuel storage container according to claim 1 , wherein the side wall has a bellows shape. 対向する前記側壁部のうち１つの前記側壁部の幅が他の前記側壁部の幅よりも狭くなっている請求項１に記載の核燃料収納容器。 The nuclear fuel storage container according to claim 1 , wherein the width of one of the opposing side wall portions is narrower than the width of the other side wall portion. 前記一列に配置された複数の収納領域が伸びる方向である前記連結部の長手方向に伸びる切欠き部が前記側壁部に形成されている請求項１に記載の核燃料収納容器。 2. The nuclear fuel storage container according to claim 1 , wherein a cutout portion extending in a longitudinal direction of the connecting portion, which is a direction in which the plurality of storage regions arranged in a row extends, is formed in the side wall portion. 核燃料収納容器として、請求項１ないし６のいずれか１項に記載の核燃料収納容器を用いる燃料集合体の核燃料収納容器への収納方法。 As nuclear fuel storing container, storage method of the nuclear fuel container of a fuel assembly using the nuclear fuel container according to any one of claims 1 to 6.
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