JP6793069B2

JP6793069B2 - Basket for cask

Info

Publication number: JP6793069B2
Application number: JP2017050677A
Authority: JP
Inventors: 章夫大岩; 晃樋口; 岡田　潤; 潤岡田; 東輝馬
Original assignee: Hitachi Zosen Corp
Current assignee: Hitachi Zosen Corp
Priority date: 2017-03-16
Filing date: 2017-03-16
Publication date: 2020-12-02
Anticipated expiration: 2037-03-16
Also published as: JP2018155521A

Description

本発明は、使用済燃料を収容するキャスク用バスケットに関する。 The present invention relates to a cask basket for accommodating spent fuel.

使用済燃料の輸送用・貯蔵用・輸送貯蔵兼用容器である金属キャスク内に、使用済燃料を収容するためのバスケットには、比強度（密度と強度の比）に優れたアルミニウム合金を使用することが認められていた。しかし、２０１５年１０月１日に日本機械学会の使用済燃料貯蔵施設規格、金属キャスク構造規格に於いて、金属キャスクバスケット用アルミニウム合金事例規格が廃止されたことに伴い、金属キャスクバスケットの構造強度部材には、ステンレス鋼やたとえば中・常温圧力容器用炭素鋼鋼板などの炭素鋼を使用することが求められている。 An aluminum alloy with excellent specific strength (ratio of density to strength) is used for the basket for storing spent fuel in the metal cask, which is a container for transporting, storing, and transporting and storing spent fuel. Was recognized. However, on October 1, 2015, the structural strength of metal cask baskets was abolished due to the abolition of the aluminum alloy case standard for metal cask baskets in the spent fuel storage facility standards and metal cask structural standards of the Japan Society of Mechanical Engineers. It is required to use stainless steel or carbon steel such as carbon steel steel plate for medium / normal temperature pressure vessels as a member.

バスケットにたとえば中・常温圧力容器用炭素鋼鋼板を使用して、使用済燃料を収容するための角パイプを製造する場合、アルミニウム合金を使用した角パイプの製造方法である押出成形や引抜成形が適さないことが知られている。 When manufacturing a square pipe for accommodating spent fuel using, for example, carbon steel steel plate for medium / normal temperature pressure vessels in a basket, extrusion molding or drawing molding, which is a method for manufacturing a square pipe using an aluminum alloy, is performed. It is known to be unsuitable.

ところで、国際原子力機関（ＩＡＥＡ）のルールにより、９ｍ自由落下試験に対して、金属キャスクが密封されており、バスケットの基本的機能である除熱および未臨界が健全であることが求められている。ここで、水平姿勢の落下が最も衝撃力が大きく厳しい試験である。バスケットに炭素鋼製の角パイプを採用すると、バスケットの重量が増大し、衝突時の慣性力が増加するため、より高い機械的強度が必要となる。 By the way, according to the rules of the International Atomic Energy Agency (IAEA), the metal cask is sealed for the 9m free fall test, and the basic functions of the basket, heat removal and subcriticality, are required to be sound. .. Here, the fall in the horizontal posture has the largest impact force and is a strict test. Adopting a square pipe made of carbon steel for the basket increases the weight of the basket and increases the inertial force at the time of collision, so that higher mechanical strength is required.

特許文献３に記載されるように、たとえば４枚の鋼板を組み合わせた場合、組み合わせた四隅コーナ部の強度が十分でなく、水平姿勢の落下による衝撃力により変形するおそれがある。 As described in Patent Document 3, for example, when four steel plates are combined, the strength of the combined four corner corners is not sufficient, and there is a risk of deformation due to an impact force due to a fall in a horizontal posture.

ところで、炭素鋼板を曲げ加工したＬ形材を組み合わせて角パイプを形成し、これら角パイプの集合体によりバスケットを製造する場合、炭素鋼板はシャープエッジで折り曲げることができないため、そのコーナ部は曲率半径を有する湾曲凸状の湾曲形断面となる。水平落下時には、その衝撃力が隣接する各パイプにも伝達されるため、湾曲状のコーナ部には、圧縮力以外に曲げモーメントも作用する。このため、シャープエッジのコーナ部を有する角パイプの集合体に比較して、湾曲状のコーナ部を有する角パイプの集合体の強度が大幅に低下することが考えられる。 By the way, when a square pipe is formed by combining L-shaped members obtained by bending a carbon steel plate and a basket is manufactured from an aggregate of these square pipes, the carbon steel plate cannot be bent at a sharp edge, so that the corner portion is curved. It has a curved convex curved cross section with a radius. At the time of horizontal fall, the impact force is transmitted to each adjacent pipe, so that a bending moment acts on the curved corner portion in addition to the compressive force. Therefore, it is considered that the strength of the aggregate of the square pipes having the curved corners is significantly reduced as compared with the aggregate of the square pipes having the corners of the sharp edges.

この対策として、湾曲状のコーナ部を有する角パイプの集合体において、強度を確保するために、たとえば特許文献２には、コーナ部にアングル形スペーサを配置した技術が提案されている。また特許文献１には、互いに隣接する４本の角パイプのコーナ部において、一方の対角線上のコーナ部に湾曲状のアングル形スペーサを設けたものや、十字形断面のスペーサを配置したものが提案されている。 As a countermeasure for this, in order to secure the strength of an aggregate of square pipes having a curved corner portion, for example, Patent Document 2 proposes a technique in which an angle-shaped spacer is arranged at the corner portion. Further, in Patent Document 1, in the corner portions of four square pipes adjacent to each other, one in which a curved angle-shaped spacer is provided at one diagonal corner portion and one in which a spacer having a cross-shaped cross section is arranged. Proposed.

特開昭６２−２９７７８８号公報Japanese Unexamined Patent Publication No. 62-297788 特開２０１４−１０９４７０号公報Japanese Unexamined Patent Publication No. 2014-109470 特開２０１６−１９１５６９号公報JP-A-2016-191569

しかしながら、特許文献１〜３に示されたアングル形などのスペーサは、強度の向上機能を果たしているが、組立作業で、ビスなどの別途固定具を用いて、角パイプのコーナ部に位置決め固定する必要があり、組立作業に手間が係るという問題があった。なお、特許文献１の十字形断面のスペーサは、製造が難しく、高コストになるという問題があった。 However, although the spacers such as the angle type shown in Patent Documents 1 to 3 have a function of improving the strength, they are positioned and fixed to the corner portion of the square pipe by using a separate fixture such as a screw in the assembly work. There was a problem that it was necessary and the assembly work was troublesome. The spacer having a cross section of Patent Document 1 has a problem that it is difficult to manufacture and the cost is high.

本発明は上記問題点を解決して、組立作業が容易で、機械的強度も向上できるキャスク用バスケットを提供することを目的とする。 An object of the present invention is to solve the above problems and to provide a basket for cask, which is easy to assemble and can improve mechanical strength.

上記課題を解決するために本発明は、使用済燃料を収容する複数本の角パイプの４つの側面が対面配置されて格子状断面に組み立てられたキャスク用バスケットであって、前記角パイプは、対角位置の分割コーナ部で二分割された一対のＬ形材と、これらＬ形材の一対の分割コーナ部にそれぞれ形成され上下方向に嵌合されてＬ形材を連結する複数の掛止部と、前記角パイプの分割コーナ部で上下位置の掛止部間に組み込まれて前記Ｌ形材の上下方向の変位を規制し前記掛止部を抜け止めする規制部材と、を具備し、前記規制部材は、分割コーナ部に係合されるＬ形断面の本体部を有し、４本の前記角パイプのコーナ部が互いに隣接して配置された交差部空間で、前記本体部は、一方の対角位置の前記角パイプの分割コーナ部に沿って配置されるとともに、対面して隣接する角パイプの側面に接して配置されて、前記角パイプに負荷される衝撃力を、隣接する前記角パイプに伝達可能であることを特徴とする。 In order to solve the above problems, the present invention is a cask basket in which four side surfaces of a plurality of square pipes for accommodating spent fuel are arranged facing each other and assembled in a grid-like cross section. A pair of L-shaped members divided into two at diagonally divided corners, and a plurality of hooks formed on each of the pair of divided corners of these L-shaped members and fitted in the vertical direction to connect the L-shaped members. A portion and a regulating member incorporated between the hooking portions at the vertical positions at the split corner portion of the square pipe to regulate the vertical displacement of the L-shaped member and prevent the hooking portion from coming off. The regulating member has a main body portion having an L-shaped cross section that is engaged with a split corner portion, and is an intersection space in which corner portions of the four square pipes are arranged adjacent to each other. It is arranged along the split corner portion of the square pipe at one diagonal position, and is arranged in contact with the side surface of the adjacent square pipe facing each other, so that the impact force applied to the square pipe is adjacent to the square pipe. It is characterized in that it can be transmitted to the square pipe.

上記構成によれば、規制部材に、Ｌ形材を連結するための複数の掛止部間に配置されて掛止部を抜け止めする機能を設けたので、角パイプを組み立てる際に、規制部材の位置決めや固定する作業が不要となり、角パイプの組立作業に容易化して低コストに製造できる。また複数本の角パイプを格子状断面に組み立てられた状態で、湾曲状断面の４つのコーナ部が対面する交差部空間で、角パイプに負荷される衝撃力を、規制部材を介して隣接する角パイプに良好に伝達させて、角パイプの機械的強度を向上させる機能を奏する。 According to the above configuration, since the regulating member is provided with a function of being arranged between a plurality of hooking portions for connecting the L-shaped members to prevent the hooking portions from coming off, the regulating member is provided when assembling the square pipe. The work of positioning and fixing the pipe is not required, and the work of assembling the square pipe is facilitated and the pipe can be manufactured at low cost. Further, in a state where a plurality of square pipes are assembled in a grid-like cross section, the impact force applied to the square pipes is adjacent to each other via a regulating member in the intersection space where the four corners of the curved cross section face each other. It has the function of improving the mechanical strength of the square pipe by transmitting it well to the square pipe.

また上記構成において、角パイプは、四隅コーナ部が湾曲凸状の湾曲形断面に形成され、規制部材の本体部内面に、前記角パイプの分割コーナ部に係合する湾曲凹状のコーナ部内面が形成されることが好ましい。この構成によれば、角パイプの連結コーナ部と規制部材のコーナ部内面との密着性を高めることにより、規制部材による衝撃力の伝達性能を高め、キャスク用バスケットの強度を高めることができる。 Further, in the above configuration, in the square pipe, the four corner corner portions are formed in a curved convex cross section, and the inner surface of the main body portion of the regulating member has a curved concave corner portion inner surface that engages with the split corner portion of the square pipe. It is preferably formed. According to this configuration, by improving the adhesion between the connecting corner portion of the square pipe and the inner surface of the corner portion of the regulating member, the impact force transmission performance of the regulating member can be enhanced and the strength of the cask basket can be increased.

さらに上記構成において、規制部材は、コーナ部内面の反対側に傾斜平面が形成され、交差部空間に配置される一対の規制部材は、交差部空間中心を中心とする点対称の同一断面に形成されるとともに、前記交差部空間内で前記傾斜平面がスライド自在に当接された構成であることが好ましい。この構成によれば、交差部空間で交差部空間中心を中心とする曲げモーメントを、良好に隣接する他の角パイプに伝達して、支持させることができ、曲げモーメントに対する機械的強度を向上させることができる。 Further, in the above configuration, the restricting member has an inclined plane formed on the opposite side of the inner surface of the corner portion, and the pair of restricting members arranged in the intersection space are formed in the same point-symmetrical cross section centered on the intersection space center. At the same time, it is preferable that the inclined planes are slidably abutted in the intersection space. According to this configuration, the bending moment centered on the center of the intersection space can be transmitted to and supported by other square pipes that are well adjacent to each other in the intersection space, and the mechanical strength against the bending moment is improved. be able to.

さらにまた、上記構成において、交差部空間に配置される一対の規制部材のコーナ部外面にそれぞれ接する楕円形断面のパイプ形支持材を、角パイプの全長にわたって配置することが好ましい。上記構成によれば、パイプ形支持材により衝撃力を良好に伝達して吸収、支持することができ、また中実体と比べて軽量で、衝撃による損傷を防止することができる。 Furthermore, in the above configuration, it is preferable to arrange the pipe-shaped support members having an elliptical cross section in contact with the outer surfaces of the corners of the pair of regulating members arranged in the intersection space over the entire length of the square pipe. According to the above configuration, the pipe-shaped support material can satisfactorily transmit, absorb, and support the impact force, is lighter than the medium substance, and can prevent damage due to the impact.

また、上記構成において、一方のＬ形材の掛止部は、長さ方向の一端側に開口部が形成された第１鍵形突片であり、他方のＬ形材の掛止部は、長さ方向の他端側に開口部が形成されて前記第１鍵形突片に嵌合する第２鍵形突片であり、規制部材は、前記第２鍵形突片の開口部反対側と前記第１鍵形突片の開口部反対側の間に配置される本体部と、長さ方向の一端側で前記掛止部の一側部に沿って配置される第１突出片と、長さ方向の他端側で掛止部の他側部に沿って配置される第２突出片とを有することが好ましい。この構成によれば、第１、第２鍵形突片を互いに嵌合することで、一対のＬ形材により強固に連結して角パイプを形成することができ、規制部材を装着するだけで本体部により第１、第２鍵形突片を確実に抜け止めすることができる。 Further, in the above configuration, the hooking portion of one L-shaped member is a first key-shaped projecting piece having an opening formed on one end side in the length direction, and the hooking portion of the other L-shaped member is A second key-shaped projecting piece having an opening formed on the other end side in the length direction and fitted to the first key-shaped projecting piece, and the regulating member is the opposite side of the opening of the second key-shaped projecting piece. A main body portion arranged between the first key-shaped projecting piece and the opposite side of the opening, and a first protruding piece arranged along one side portion of the hooking portion on one end side in the length direction. It is preferable to have a second protruding piece arranged along the other side of the hooking portion on the other end side in the length direction. According to this configuration, by fitting the first and second key-shaped projecting pieces to each other, a pair of L-shaped members can be firmly connected to form a square pipe, and only by attaching a regulating member. The main body can reliably prevent the first and second key-shaped projecting pieces from coming off.

また上記構成において、互いに対面する角パイプの面板間で規制部材の厚み分の間隙に、中性子吸収板が介装されたものであることが好ましい。 Further, in the above configuration, it is preferable that a neutron absorbing plate is interposed between the face plates of the square pipes facing each other by the thickness of the regulating member.

本発明によれば、規制部材に、掛止部を抜け止めする機能と、角パイプの機械的強度を向上させる機能を持たせることにより、組立作業が容易で、角パイプの強度を向上させることができる。 According to the present invention, by providing the regulating member with a function of preventing the hooking portion from coming off and a function of improving the mechanical strength of the square pipe, the assembly work is easy and the strength of the square pipe is improved. Can be done.

本発明に係るキャスク用バスケットを備えたキャスクの実施の形態を示す一部切欠き斜視図である。It is a partially cutaway perspective view which shows the embodiment of the cask provided with the basket for cask which concerns on this invention. キャスク用バスケットの横断面図である。It is a cross-sectional view of the basket for cask. キャスク用バスケットの実施例１を示し、角パイプ集合体を示す部分拡大横断面図である。FIG. 1 is a partially enlarged cross-sectional view showing Example 1 of a cask basket and showing an aggregate of square pipes. (ａ)〜（ｃ）は角パイプの組立手順を説明する斜視図で、(ａ)はＬ形材による角パイプの組立状態、（ｂ）は角パイプへの規制部材の配置状態、（ｃ）は角パイプへの規制部材の装着状態を示す。(a) to (c) are perspective views for explaining the procedure for assembling the square pipe, (a) is the assembled state of the square pipe with the L-shaped material, (b) is the arranged state of the regulating member on the square pipe, (c). ) Indicates the mounting state of the regulating member on the square pipe. (ａ)〜（ｃ）は掛止部に対する規制部材の装着手順を説明する部分切欠き斜視図で、(ａ)はＬ形材の組立手順、（ｂ）は掛止部への規制部材の装着手順、（ｃ）は規制部材が装着された掛止部を示す。(a) to (c) are partially cutaway perspective views for explaining the procedure for attaching the regulating member to the hooking portion, (a) is the procedure for assembling the L-shaped member, and (b) is the regulating member for the hooking portion. The mounting procedure, (c), shows the hooking portion on which the regulating member is mounted. (ａ)〜（ｅ）は図６（ｃ）に示す断面図で、(ａ)はＡ−Ａ断面図、(ｂ)はＢ−Ｂ断面図、(ｃ)はＣ−Ｃ断面図、(ｄ)はＤ−Ｄ断面図、(ｅ)はＥ−Ｅ断面図である。(A) to (e) are cross-sectional views shown in FIG. 6 (c), (a) is a cross-sectional view taken along the line AA, (b) is a cross-sectional view taken along the line BB, and (c) is a cross-sectional view taken along the line CC. d) is a cross-sectional view taken along the line DD, and (e) is a cross-sectional view taken along the line EE. 交差部空間における規制部材の本体部を示す部分断面図である。It is a partial cross-sectional view which shows the main body part of the regulation member in the intersection space. (ａ)および（ｂ）は規制部材の実施例２を示し、(ａ)は交差部空間における本体部を示す横断面図、（ｂ）は(ａ)における分解斜視図である。(a) and (b) show Example 2 of the regulation member, (a) is a cross-sectional view which shows the main body part in an intersection space, and (b) is an exploded perspective view in (a). (ａ)および（ｂ）は規制部材の実施例３を示し、(ａ)は交差部空間における本体部を示す横断面図、（ｂ）は(ａ)の分解斜視図である。(a) and (b) show Example 3 of the regulation member, (a) is a cross-sectional view which shows the main body part in an intersection space, and (b) is an exploded perspective view of (a). (ａ)および（ｂ）は規制部材の実施例４を示し、(ａ)は交差部空間における本体部を示す横断面図、（ｂ）は(ａ)の分解斜視図である。(a) and (b) show Example 4 of the regulation member, (a) is a cross-sectional view which shows the main body part in an intersection space, and (b) is an exploded perspective view of (a). (ａ)および（ｂ）は規制部材の実施例５を示し、(ａ)は交差部空間における本体部を示す横断面図、（ｂ）は(ａ)の分解斜視図である。(a) and (b) show Example 5 of the regulation member, (a) is a cross-sectional view which shows the main body part in an intersection space, and (b) is an exploded perspective view of (a).

［実施の形態］
以下、本発明に係るキャスク用バスケットを備えたキャスクの実施の形態を、図１および図２に基づいて説明する。 [Embodiment]
Hereinafter, embodiments of a cask provided with a cask basket according to the present invention will be described with reference to FIGS. 1 and 2.

このキャスクは、図１および図２に示すように、強度を保つためにステンレス鋼や炭素鋼、炭素鋼合金で製造された円筒状の胴部本体１１を具備し、胴部本体１１内に、本発明に係るキャスク用バスケット１０が配置されている。キャスク用バスケット１０は、炭素鋼製の複数本の角パイプ１２を組み合わせたパイプ集合体１３と、このパイプ集合体１３の外周部で胴部本体１１との間に、周方向に複数に分割されて配置され熱伝導率が高いアルミニウム合金製の外周部材１４とを具備している。 As shown in FIGS. 1 and 2, this cask includes a cylindrical body 11 made of stainless steel, carbon steel, or a carbon steel alloy in order to maintain strength, and the inside of the body 11 is provided with a cylindrical body body 11. The cask basket 10 according to the present invention is arranged. The cask basket 10 is divided into a plurality of pieces in the circumferential direction between the pipe assembly 13 in which a plurality of square pipes 12 made of carbon steel are combined and the body 11 at the outer peripheral portion of the pipe assembly 13. It is provided with an outer peripheral member 14 made of an aluminum alloy having a high thermal conductivity.

胴部本体１１の一方の端部である底面に、底板（図示せず）が溶接等により一体に取り付けられて閉鎖されている。胴部本体１１の他方の端部である天面に、使用済燃料を出し入れする開口部１５が形成され、この開口部１５に、ステンレス鋼製の一次蓋１６と、炭素鋼製の二次蓋１７が着脱可能に取り付けられている。 A bottom plate (not shown) is integrally attached to the bottom surface, which is one end of the body portion main body 11, by welding or the like to be closed. An opening 15 for taking in and out spent fuel is formed on the top surface, which is the other end of the body portion 11, and a stainless steel primary lid 16 and a carbon steel secondary lid 16 are formed in the opening 15. 17 is detachably attached.

また胴部本体１１の外周部は、γ線遮蔽物質であるレジンを収容する複数の遮蔽材室（図示せず）が形成された外殻体１９で覆われている。２０は胴部本体１１の両端部に外殻体１９からそれぞれ突出された吊下用のトラニオン軸である。 Further, the outer peripheral portion of the body portion main body 11 is covered with an outer shell body 19 in which a plurality of shielding material chambers (not shown) for accommodating a resin which is a γ-ray shielding substance are formed. Reference numeral 20 denotes a trunnion shaft for suspension, which is projected from the outer shell body 19 at both ends of the body body 11.

また胴部本体１１の両端側外周部には、たとえば木材製の緩衝構造体２１がそれぞれ取り付けられ、これら緩衝構造体２１により水平落下姿勢や垂直落下姿勢、コーナ部から落下する傾斜落下姿勢における衝撃を緩衝するように構成されている。 Further, for example, cushioning structures 21 made of wood are attached to the outer peripheral portions on both ends of the body portion 11, and the impacts in the horizontal falling posture, the vertical falling posture, and the inclined falling posture of falling from the corner portion due to these cushioning structures 21. Is configured to buffer.

（実施例１）
本発明に係るキャスク用バスケットの実施例１を図３〜図７を参照して説明する。 (Example 1)
Example 1 of the cask basket according to the present invention will be described with reference to FIGS. 3 to 7.

(角パイプ)
このパイプ集合体１３は、複数本の角パイプ１２の４つの面板１２ａ，１２ｂが対面配置されて格子状断面に組み立てられている。角パイプ１２は、図３，図４に示すように、一方の対角位置の分割コーナ部１２ｃで二分割された同一厚みで一対のＬ形材１２Ａ，１２Ｂと、これらＬ形材１２Ａ，１２Ｂの分割コーナ部１２ｃにそれぞれ形成されてＬ形材１２Ａ，１２Ｂを互いに連結する複数の掛止部３２と、前記角パイプ１２の分割コーナ部１２ｃで上下に隣接する掛止部３２間に組み込まれた規制部材３３Ａ，３３Ｂと、を具備し、規制部材３３Ａ，３３ＢはＬ形材１２Ａ，１２Ｂの上下方向の変位を規制して前記掛止部３２を抜け止めする。 (Square pipe)
The pipe assembly 13 is assembled in a grid-like cross section by arranging four face plates 12a and 12b of a plurality of square pipes 12 facing each other. As shown in FIGS. 3 and 4, the square pipe 12 has a pair of L-shaped members 12A and 12B having the same thickness and are divided into two by a split corner portion 12c at one diagonal position, and these L-shaped members 12A and 12B. It is incorporated between a plurality of hooking portions 32 formed in the divided corner portions 12c of the above and connecting the L-shaped members 12A and 12B to each other and the hooking portions 32 vertically adjacent to each other by the divided corner portions 12c of the square pipe 12. The regulating members 33A and 33B are provided, and the regulating members 33A and 33B regulate the vertical displacement of the L-shaped members 12A and 12B to prevent the hooking portion 32 from coming off.

図３に示すように、一方のＬ形材１２Ａは、湾曲状に直角に折れ曲る連結コーナ部１２ｄと、連結コーナ部１２ｄから左右両側に延びる一対の面板１２ａ，１２ａとを具備している。他方のＬ形材１２Ｂは、円弧部を介して直角に折れ曲る連結コーナ部１２ｄと、連結コーナ部１２ｄから左右両側に延びる一対の面板１２ｂ，１２ｂとを具備している。そして、一方のＬ形材１２Ａの面板１２ａの幅Ｗ１は、他方のＬ形材１２Ｂの面板１２ｂの幅Ｗ２に比較して、面板１２ａ，１２ｂの厚み分ｔだけ短く形成されている。さらに分割コーナ部１２ｃでは、他方のＬ形材１２Ｂの面板１２ｂの内面に、一方のＬ形材１２Ａの面板１２ａの端面が当て付けられた状態で組み立てられる。また他方のＬ形材１２Ｂの面板１２ｂの端面が１／４円弧凸状の湾曲面１２ｅに形成され、これら分割コーナ部１２ｃの湾曲面１２ｅと連結コーナ部１２ｄにより、角パイプ１２の四隅のコーナ部１２ｃ，１２ｄが湾曲凸状に形成される。 As shown in FIG. 3, one L-shaped member 12A includes a connecting corner portion 12d that bends at a right angle in a curved shape, and a pair of face plates 12a and 12a extending from the connecting corner portion 12d on both left and right sides. .. The other L-shaped member 12B includes a connecting corner portion 12d that bends at a right angle via an arc portion, and a pair of face plates 12b and 12b extending from the connecting corner portion 12d on both left and right sides. The width W1 of the face plate 12a of one L-shaped member 12A is formed shorter than the width W2 of the face plate 12b of the other L-shaped member 12B by the thickness t of the face plates 12a and 12b. Further, the split corner portion 12c is assembled in a state where the end face of the face plate 12a of the one L-shaped member 12A is attached to the inner surface of the face plate 12b of the other L-shaped member 12B. Further, the end surface of the face plate 12b of the other L-shaped member 12B is formed on a curved surface 12e having a 1/4 arc convex shape, and the curved surface 12e of the divided corner portion 12c and the connecting corner portion 12d form corners at the four corners of the square pipe 12. The portions 12c and 12d are formed in a curved convex shape.

(掛止部)
図４，図５に示すように、掛止部３２は、一方のＬ形材１２Ａの左右の分割コーナ部１２ｃに厚み分だけ突設された第１鍵形突片３４と、他方のＬ形材１２Ｂの左右の分割コーナ部１２ｃに厚み分だけ突設された第２鍵形突片３５とを具備している。そして第１鍵形突片３４には、Ｌ形材１２Ａの長さ方向の一端側(図上方)に向かって開口された開口部３４ａが形成され、第２鍵形突片３５には、Ｌ形材１２Ａの長さ方向の他端側(図下方)に向かって開口された開口部３５ａが形成され、これら第１鍵形突片３４の開口部３４ａと第２鍵形突片３５の開口部３５ａは互いに嵌合可能に形成されている。さらに他方のＬ形材１２Ｂには、第２鍵形突片３５の開口部３５ａの奥面から下方に連続して、第１鍵形突片３４を挿入可能な凹入部３５ｃが形成されている。したがって、第１鍵形突片３４を凹入部３５ｃにそれぞれ嵌め入れた後、一方のＬ形材１２Ａを上方にスライドさせることにより、第１鍵形突片３４の開口部３４ａを第２鍵形突片３５の開口部３５ａにそれぞれ嵌合させて掛止部３２を連結し、一方のＬ形材１２Ａと他方のＬ形材１２Ｂと組み立てて角パイプ１２を形成することができる。 (Hooking part)
As shown in FIGS. 4 and 5, the hooking portion 32 includes a first key-shaped projecting piece 34 projecting from the left and right split corner portions 12c of one L-shaped member 12A by the thickness of the other L-shaped member 12A. The left and right split corner portions 12c of the material 12B are provided with a second key-shaped projecting piece 35 projecting by the thickness. The first key-shaped projecting piece 34 is formed with an opening 34a opened toward one end side (upper part of the drawing) of the L-shaped member 12A in the length direction, and the second key-shaped projecting piece 35 is formed with an L. An opening 35a opened toward the other end side (lower part of the figure) of the profile 12A in the length direction is formed, and the opening 34a of the first key-shaped projecting piece 34 and the opening of the second key-shaped projecting piece 35 are formed. The portions 35a are formed so as to be fitted to each other. Further, the other L-shaped member 12B is formed with a recessed portion 35c into which the first key-shaped projecting piece 34 can be inserted, which is continuous downward from the back surface of the opening 35a of the second key-shaped projecting piece 35. .. Therefore, after each of the first key-shaped projecting pieces 34 is fitted into the recessed portions 35c, one L-shaped member 12A is slid upward to open the opening 34a of the first key-shaped projecting piece 34 into the second key shape. The square pipe 12 can be formed by fitting the hooking portion 32 into the opening 35a of the projecting piece 35 and assembling the L-shaped member 12A on one side and the L-shaped member 12B on the other side.

(規制部材)
図４，図５に示すように、規制部材３３Ａ，３３Ｂは、Ｌ形材１２Ａ，１２Ｂと同一厚みの炭素鋼板を折り曲げて成形されており、角パイプ１２の対角位置の一方の分割コーナ部１２ｃで、長さ方向の両端の掛止部３２と次の掛止部３２の間に装着される短尺状の副規制部材３３Ｂと、その他の掛止部３２間に装着される長尺状の主規制部材３３Ａとからなる。これら規制部材３３Ａ，３３Ｂは、左右一対で同一厚みの面板部３３ｇ，３３ｈを有するアングル形断面の本体部３３ａと、左右一方の面板部３３ｈから同一厚みで上方に延びる平板状の第１突出片３３ｂと、左右他方の面板部３３ｇから同一厚みで下方に延びる平板状の第２突出片３３ｃと、を具備している。さらに第１突出片３３ｂの基端部で本体部３３ａの端面に形成された段部状の第１規制部３３ｄと、第２突出片３３ｃの基端部で本体部３３ａの端面に形成された段部状の第２規制部３３ｅとが形成されている。したがって、上下に隣接する掛止部３２間で、第１規制部３３ｄが、上位の第１鍵形突片３４の開口部３４ａの反対側で面板１２ａから立ち上がる段部３４ｂに当接して第１鍵形突片３４の下方への移動を規制するとともに、第２規制部３３ｅが、下位の第２鍵形突片３５の開口部３５ａの反対側で面板１２ｂから立ち上がる段部３５ｂに当接して第２鍵形突片３５の上方への移動を規制する。このように本体部３３ａの上下位置の第１規制部３３ｄと第２規制部３３ｅにより、第１鍵形突片３４と第２鍵形突片３５の変位を規制して抜け止めすることができる。ところで、図５において、１点鎖線で繋がれたＬ形材１２Ａは同一物体であることを示している。Ｌ形材１２Ｂ、本体部３３ａも同様である。 (Regulatory member)
As shown in FIGS. 4 and 5, the regulating members 33A and 33B are formed by bending a carbon steel plate having the same thickness as the L-shaped members 12A and 12B, and are formed by bending one of the split corner portions at the diagonal positions of the square pipe 12. In 12c, a short sub-regulatory member 33B mounted between the hooks 32 at both ends in the length direction and the next hook 32, and a long one mounted between the other hooks 32. It is composed of a main regulation member 33A. These regulating members 33A and 33B are a pair of left and right face plate portions 33g and 33h having the same thickness and an angled cross-section main body portion 33a, and a flat plate-shaped first protruding piece extending upward from one of the left and right face plate portions 33h with the same thickness. It includes 33b and a flat plate-shaped second protruding piece 33c extending downward from the left and right other face plate portions 33g with the same thickness. Further, a stepped first regulating portion 33d formed on the end face of the main body 33a at the base end of the first protruding piece 33b and a stepped first regulating portion 33d formed on the end face of the main body 33a at the base end of the second protruding piece 33c. A stepped second regulating portion 33e is formed. Therefore, between the vertically adjacent hooking portions 32, the first regulating portion 33d comes into contact with the step portion 34b rising from the face plate 12a on the opposite side of the opening 34a of the upper first key-shaped projecting piece 34, and the first While restricting the downward movement of the key-shaped projecting piece 34, the second regulating unit 33e abuts on the step portion 35b rising from the face plate 12b on the opposite side of the opening 35a of the lower second key-shaped projecting piece 35. The upward movement of the second key-shaped projecting piece 35 is restricted. In this way, the first regulating portion 33d and the second regulating portion 33e at the vertical positions of the main body portion 33a can regulate the displacement of the first key-shaped projecting piece 34 and the second key-shaped projecting piece 35 to prevent them from coming off. .. By the way, in FIG. 5, it is shown that the L-shaped members 12A connected by the alternate long and short dash line are the same object. The same applies to the L-shaped member 12B and the main body portion 33a.

さらに、図７に示すように、交差部空間３１に組み込まれた状態で、第１突出片３３ｂは一方のＬ形材１２Ａの面板１２ａに沿って配置され、隣接する角パイプ１２の面板１２ｂに衝撃力を伝達する。また交差部空間３１に組み込まれた状態で、第２突出片３３ｃは他方のＬ形材１２Ｂの面板１２ｂに沿って配置され、隣接する角パイプ１２の面板１２ａに衝撃力を伝達する。そして各掛止部３２では、第１突出片３３ｂの内端面が第１鍵形突片３５の側面に接して配置されると同時に、第２突出片３３ｃの内端面が第２鍵形突片３４の側面に接して配置される。これにより、掛止部３２を両側(または片側)から補強することができる。 Further, as shown in FIG. 7, the first protruding piece 33b is arranged along the face plate 12a of one L-shaped member 12A in a state of being incorporated in the intersection space 31, and is placed on the face plate 12b of the adjacent square pipe 12. Transmits impact force. Further, in a state of being incorporated in the intersection space 31, the second protruding piece 33c is arranged along the face plate 12b of the other L-shaped member 12B, and transmits an impact force to the face plate 12a of the adjacent square pipe 12. In each hook 32, the inner end surface of the first protruding piece 33b is arranged in contact with the side surface of the first key-shaped projecting piece 35, and at the same time, the inner end surface of the second protruding piece 33c is arranged in contact with the side surface of the first key-shaped projecting piece 35. It is arranged in contact with the side surface of 34. As a result, the hooking portion 32 can be reinforced from both sides (or one side).

さらにまた、図６（ａ），図７に示すように、規制部材３３Ａ，３３Ｂの本体部３３ａは、面板部３３ｇ，３３ｈが湾曲凸状のコーナ部３３ｆを介して連結されている。コーナ部３３ｆは、分割コーナ部１２ｃの湾曲面１２ｅに密着状態で嵌め合わされる湾曲凹状のコーナ部内面３３ｉと湾曲凸状のコーナ部外面３３ｊにそれぞれ形成されている。コーナ部内面３３ｉにより、角パイプ１２と規制部材３３Ａ，３３Ｂの間で衝撃力をスムーズに伝達することができる。 Furthermore, as shown in FIGS. 6A and 7, the main body portions 33a of the regulating members 33A and 33B are connected to the face plate portions 33g and 33h via curved convex corner portions 33f. The corner portion 33f is formed on the curved concave corner portion inner surface 33i and the curved convex corner portion outer surface 33j, which are fitted to the curved surface 12e of the divided corner portion 12c in close contact with each other. The inner surface 33i of the corner portion allows the impact force to be smoothly transmitted between the square pipe 12 and the regulating members 33A and 33B.

図４（ｃ）に示すように、角パイプ１２は、使用済燃料を収容可能な所定の長さに形成され、対角方向の一方の分割コーナ部１２ｃで一定の間隔Ｌで掛止部３２が形成され、対角方向の他方の分割コーナ部１２ｃで、長さ方向の両端側がＬ／２で、残りが間隔Ｌの間隔で掛止部３２が形成され、連結強度が均等になるように形成されている。ここで、間隔Ｌで配置された掛止部３２間に主規制部材３３Ａが配置され、間隔Ｌ／２で配置された掛止部３２間に副規制部材３３Ｂが配置される。そして、パイプ集合体１３では、交差部空間３１に配置される規制部材３３Ａ，３３Ｂの本体部３３ａが配置される長さにより、パイプ集合体１３の耐衝撃強度が増減される。なお、この掛止部３２の形成数や大きさは、規格や客先などにより要求される角パイプ１２の剛性や強度に基づいて、任意に設定することができる。 As shown in FIG. 4C, the square pipe 12 is formed to have a predetermined length that can accommodate spent fuel, and the hooking portions 32 are formed at regular intervals L at one of the diagonally divided corner portions 12c. Is formed, and at the other split corner portion 12c in the diagonal direction, the hooking portions 32 are formed at intervals of L / 2 on both ends in the length direction and the interval L at the rest so that the connection strength becomes uniform. It is formed. Here, the main regulating member 33A is arranged between the hooking portions 32 arranged at the interval L, and the sub-regulating member 33B is arranged between the hooking portions 32 arranged at the interval L / 2. Then, in the pipe assembly 13, the impact resistance strength of the pipe assembly 13 is increased or decreased depending on the length at which the main body 33a of the regulating members 33A and 33B arranged in the intersection space 31 is arranged. The number and size of the hooking portions 32 formed can be arbitrarily set based on the rigidity and strength of the square pipe 12 required by the standard and the customer.

また図３に示すように、互いに対面する角パイプ１２の面板１２ａ，１２ｂ間に規制部材３３Ａ，３３Ｂの厚み分の間隙が形成され、この間隙に中性子吸収板３６が介装される。 Further, as shown in FIG. 3, a gap corresponding to the thickness of the regulating members 33A and 33B is formed between the face plates 12a and 12b of the square pipes 12 facing each other, and the neutron absorbing plate 36 is interposed in this gap.

(組立方法)
次にこのキャスク用バスケット１０の組立方法を説明する。 (Assembly method)
Next, a method of assembling the cask basket 10 will be described.

（１）図４（ａ）および図５（ａ）に示すように、一方のＬ形材１２Ａと他方のＬ形材１２Ｂを、正方形を形成するように対面して配置する。 (1) As shown in FIGS. 4 (a) and 5 (a), one L-shaped member 12A and the other L-shaped member 12B are arranged facing each other so as to form a square.

（２）Ｌ形材１２Ａ,１２Ｂを互いに接近させて、一方のＬ形材１２Ａの第1鍵形突片３４をそれぞれ他方のＬ形材１２Ｂの凹入部３５ｃに挿入する。その後、図４（ｂ）および図５（ｂ）に示すように、一方のＬ形材１２Ａまたは他方のＬ形材１２Ｂを上下相対方向に移動して、第１、第２鍵形突片３４，３５の開口部３４ａ，３５ａを互いに嵌合させ、掛止部３２をすべて連結し、Ｌ形材１２Ａ,１２Ｂにより正方形断面の角パイプ１２を形成する。 (2) The L-shaped members 12A and 12B are brought close to each other, and the first key-shaped projecting piece 34 of the one L-shaped member 12A is inserted into the recessed portion 35c of the other L-shaped member 12B, respectively. After that, as shown in FIGS. 4 (b) and 5 (b), one L-shaped member 12A or the other L-shaped member 12B is moved in the vertical relative direction to move the first and second key-shaped projecting pieces 34. , 35 openings 34a, 35a are fitted to each other, all the hooking portions 32 are connected, and the square pipe 12 having a square cross section is formed by the L-shaped members 12A and 12B.

（３）分割コーナ部１２ｃの各掛止部３２間に対応して規制部材３３Ａ，３３Ｂをそれぞれ配置する。そして、第１鍵形突片３４の段部３４ｂと第２鍵形突片３５の段部３５ｂの間に、規制部材３３Ａ，３３Ｂの第１規制部３３ｄと第２規制部３３ｅを嵌め込む。これによりＬ形材１２Ａ,１２Ｂの上下方向の変位が規制され、第1鍵形突片３４と第２鍵形突片３５が抜け止めされることにより、掛止部３２が固定されて角パイプ１２が強固に組み立てられる。 (3) Regulatory members 33A and 33B are arranged between the hooking portions 32 of the split corner portions 12c, respectively. Then, the first regulating portion 33d and the second regulating portion 33e of the regulating members 33A and 33B are fitted between the step portion 34b of the first key-shaped projecting piece 34 and the step portion 35b of the second key-shaped projecting piece 35. As a result, the vertical displacement of the L-shaped members 12A and 12B is restricted, and the first key-shaped projecting piece 34 and the second key-shaped projecting piece 35 are prevented from coming off, whereby the hooking portion 32 is fixed and the square pipe is fixed. 12 is firmly assembled.

(４)キャスクに組み込まれる本数の角パイプ１２が組み立てられると、外周部材１４の一部を横置き状に床面に設置し、これら外周部材１４上に角パイプ１２と中性子吸収板３６を順次、面板１２ａ，１２ｂが互いに対面して格子状断面になるように重ねて配置する。さらに角パイプ１２を積み重ね、外周部材１４で覆って、固定具や緊縛具により円形状断面に固定する。このようにしてキャスク用バスケット１０が組み立てられる。 (4) When the number of square pipes 12 to be incorporated in the cask is assembled, a part of the outer peripheral member 14 is installed horizontally on the floor surface, and the square pipe 12 and the neutron absorbing plate 36 are sequentially placed on the outer peripheral member 14. , The face plates 12a and 12b are arranged so as to face each other and have a grid-like cross section. Further, the square pipes 12 are stacked, covered with the outer peripheral member 14, and fixed to a circular cross section with a fixing tool or a binding tool. In this way, the cask basket 10 is assembled.

図７に示すように、このようにして組み立てられたキャスク用バスケット１０では、四隅のコーナ部１２ｃ，１２ｄが対面する交差部空間３１において、たとえば上方(または一側方)の角パイプ１２に衝撃力Ｆ１（またはＦ２）が負荷されても、規制部材３３Ａ，３３Ｂの本体部３３ａの面板部３３ｇ，３３ｈを介して、下方(または側方)の角パイプ１２に伝達されて負荷が支持されることから、規制部材３３Ａ，３３Ｂにより角パイプ１２を補強して、パイプ集合体１３およびキャスク用バスケット１０の機械的強度を向上することができる。 As shown in FIG. 7, in the cask basket 10 assembled in this way, in the intersection space 31 where the corner portions 12c and 12d at the four corners face each other, for example, an impact is applied to the upper (or one side) square pipe 12. Even if the force F1 (or F2) is applied, the force is transmitted to the downward (or lateral) square pipe 12 via the face plate portions 33g and 33h of the main body portions 33a of the regulating members 33A and 33B to support the load. Therefore, the square pipe 12 can be reinforced by the regulating members 33A and 33B, and the mechanical strength of the pipe assembly 13 and the cask basket 10 can be improved.

（実施例の効果）
上記実施例によれば、Ｌ形材１２Ａ，１２Ｂを連結する複数の掛止部３２間に規制部材３３Ａ，３３Ｂを取付け、規制部材３３Ａ，３３Ｂにより掛止部３２を抜け止めする機能を設けたので、角パイプ１２を組み立てる際に、規制部材３３Ａ，３３Ｂの位置決めや固定する作業が不要となり、角パイプ１２の組立作業に容易化して低コストに製造できる。また複数本の角パイプ１２を格子状断面に組み立てて４つのコーナ部１２ｃ，１２ｄが対面する交差部空間３１において、たとえば水平落下により角パイプ１２に衝撃力が負荷された時に、角パイプ１２から規制部材３３Ａ，３３Ｂの本体部３３ａを介して隣接する角パイプ１２に良好に伝達して支持させることができ、角パイプ１２の機械的強度を向上させることができる。 (Effect of Examples)
According to the above embodiment, the restricting members 33A and 33B are attached between the plurality of hooking portions 32 connecting the L-shaped members 12A and 12B, and the regulating members 33A and 33B are provided with a function to prevent the hooking portions 32 from coming off. Therefore, when assembling the square pipe 12, it is not necessary to position and fix the regulating members 33A and 33B, which facilitates the assembling work of the square pipe 12 and can be manufactured at low cost. Further, in the intersection space 31 in which a plurality of square pipes 12 are assembled into a grid-like cross section and the four corner portions 12c and 12d face each other, for example, when an impact force is applied to the square pipe 12 due to a horizontal drop, the square pipe 12 is used. It can be satisfactorily transmitted to and supported by the adjacent square pipe 12 via the main body 33a of the regulating members 33A and 33B, and the mechanical strength of the square pipe 12 can be improved.

また、角パイプ１２の分割コーナ部１２ｃを湾曲凸状の湾曲面１２ｅに形成し、規制部材３３Ａ，３３Ｂの内面に、湾曲面１２ｅが密着状態で係合するコーナ部内面３３ｉを形成したので、角パイプ１２の分割コーナ部１２ｃと規制部材３３Ａ，３３Ｂのコーナ部内面３３iとの密着性を高めて規制部材３３Ａ，３３Ｂによる衝撃力の伝達性能を高め、キャスク用バスケットの機械的強度を高めることができる。 Further, since the split corner portion 12c of the square pipe 12 is formed on the curved convex curved surface 12e, and the inner surface of the regulating members 33A and 33B is formed with the corner portion inner surface 33i in which the curved surface 12e is in close contact with each other. To improve the adhesion between the split corner portion 12c of the square pipe 12 and the inner surface 33i of the corner portion of the regulating members 33A and 33B to improve the impact force transmission performance of the regulating members 33A and 33B, and to enhance the mechanical strength of the basket for cask. Can be done.

さらに、掛止部３２は、第１鍵形突片３４と第２鍵形突片３５の開口部３４ａ，３５ａを互いに嵌合することで、一対のＬ形材１２Ａ，１２Ｂにより強固な角パイプ１２を形成することができる。さらに規制部材３３Ａ，３３Ｂにより第１、第２鍵形突片３４，３５を確実に抜け止めすることができる。 Further, the hooking portion 32 is a square pipe made of a pair of L-shaped members 12A and 12B by fitting the openings 34a and 35a of the first key-shaped projecting piece 34 and the second key-shaped projecting piece 35 to each other. 12 can be formed. Further, the regulating members 33A and 33B can reliably prevent the first and second key-shaped projecting pieces 34 and 35 from coming off.

さらにまた、互いに対面する角パイプ１２の面板１２ａ，１２ｂ間で規制部材３３Ａ，３３Ｂの厚み分の間隙部に、中性子吸収板３６を介装することにより、使用済燃料の放射線の漏洩防止性能を向上させることができる。 Furthermore, by interposing a neutron absorbing plate 36 between the face plates 12a and 12b of the square pipes 12 facing each other for the thickness of the regulating members 33A and 33B, the radiation leakage prevention performance of the spent fuel can be improved. Can be improved.

(他の実施例)
上記実施例１では、衝撃力を伝達して角パイプ１２を補強する規制部材３３Ａ，３３Ｂの本体部３３ａを、角部が湾曲状のアングル形断面としたが、図８〜図１１に示す実施例２〜５の断面形状であってもよい。 (Other Examples)
In the first embodiment, the main body 33a of the regulating members 33A and 33B for transmitting the impact force to reinforce the square pipe 12 has an angled cross section with curved corners, which are shown in FIGS. 8 to 11. The cross-sectional shape of Examples 2 to 5 may be used.

（実施例２）
図８（ａ），（ｂ）に示すように、交差部空間３１に配置される規制部材３３Ａ（３３Ｂ）の本体部４１は、交差部空間３１とその近傍の面板１２ａ，１２ｂの対面空間を埋める十字形断面を、交差部空間３１の一方の対角線に沿って二分割し、一対の本体部４１の横断面を、空間部中心３１ｏを中心とする点対称で同一の略アングル形に形成したものである。 (Example 2)
As shown in FIGS. 8A and 8B, the main body 41 of the restricting member 33A (33B) arranged in the intersection space 31 covers the space 31 facing the intersection space 31 and the facing spaces of the face plates 12a and 12b in the vicinity thereof. The cross section to be filled was divided into two along one diagonal line of the intersection space 31, and the cross section of the pair of main body portions 41 was formed into the same substantially angle shape with point symmetry centered on the space portion center 31o. It is a thing.

すなわち、湾曲状のコーナ部を介して直角に折り曲げられた同一厚みの一対の面板部４１ｃ，４１ｄと、これら面板部４１ｃ，４１ｄのコーナ部で、角パイプ１２の分割コーナ部１２ｃに面接触する湾曲凹状のコーナ部内面４１ａと、コーナ部の外面で交差部空間３１の一方の対角線に沿って(面板部４１ｃ，４１ｄに対して４５°)傾斜角αで傾斜する傾斜平面４１ｂと、を具備している。そして、交差部空間３１では、本体部４１の傾斜平面４１ｂ全面が互いに摺動可能に面接触される。 That is, the pair of face plate portions 41c and 41d of the same thickness bent at right angles via the curved corner portions and the corner portions of these face plate portions 41c and 41d come into surface contact with the divided corner portions 12c of the square pipe 12. A curved concave corner portion inner surface 41a and an inclined plane 41b that is inclined at an inclination angle α along one diagonal line of the intersection space 31 on the outer surface of the corner portion (45 ° with respect to the face plate portions 41c and 41d). doing. Then, in the intersection space 31, the entire surface of the inclined plane 41b of the main body 41 is slidably brought into surface contact with each other.

したがって、図８（ａ）示すように、図左上の角パイプ１２に衝撃荷重Ｆ３が負荷されると、水平方向の面板部４１ｃを介して右下の角パイプ１２に衝撃荷重Ｆ３が伝達されて支持される。同時に、空間部中心３１ｏから離れた位置（たとえば距離Ｌ３）に加わる荷重Ｆ３′により、空間部中心３１ｏを中心とする曲げモーメントＭ３が発生するが、傾斜平面４１ｂの空間部中心３１ｏの両側の面で相対方向の曲げモーメントＭ３を支持することができる。したがって、衝撃荷重Ｆ３および曲げモーメントＭ３を、隣接する他の角パイプ１２に良好に伝達して支持することができ、衝撃荷重Ｆ３により角パイプ１２が変形するのを防止することができる。さらに、交差部空間３１を埋める十字形断面のサポート材とほぼ同様の機能を奏することができるとともに、製造も容易で低コストで製造することができる。 Therefore, as shown in FIG. 8A, when the impact load F3 is applied to the square pipe 12 in the upper left of the drawing, the impact load F3 is transmitted to the square pipe 12 in the lower right through the horizontal face plate portion 41c. Be supported. At the same time, the load F3'applied to the position away from the space center 31o (for example, the distance L3) generates a bending moment M3 centered on the space center 31o, but the surfaces on both sides of the space center 31o of the inclined plane 41b. Can support the bending moment M3 in the relative direction. Therefore, the impact load F3 and the bending moment M3 can be satisfactorily transmitted to and supported by another adjacent square pipe 12, and the square pipe 12 can be prevented from being deformed by the impact load F3. Further, it can perform almost the same function as the support material having a cross section that fills the intersection space 31, and can be easily manufactured at low cost.

（実施例３）
図９（ａ），（ｂ）に示す規制部材３３Ａ（３３Ｂ）の本体部４２は、実施例２の傾斜平面４１ｂに、軽量化のための軽量化凹部４２ｄを交差部空間３１の空間部中心３１ｏに沿って全長に形成したものである。この軽量化凹部４２ｄは、空間部中心３１ｏを中心とする半円形断面または半楕円形断面に形成されている。そして軽量化凹部４２ｄの両側に、曲げモーメントＭ３を伝達する傾斜平面４１ｂが残されている。 (Example 3)
The main body 42 of the regulation member 33A (33B) shown in FIGS. 9A and 9B has a weight reduction recess 42d for weight reduction on the inclined plane 41b of the second embodiment and is centered on the space portion of the intersection space 31. It is formed over the entire length along 31o. The lightweight recess 42d is formed in a semi-circular cross section or a semi-elliptical cross section centered on the space center 31o. An inclined plane 41b for transmitting the bending moment M3 is left on both sides of the lightweight recess 42d.

上記構成によれば、実施例２の作用効果に加えて、軽量化凹部４２ｄにより規制部材３３Ａ，３３Ｂの重量を軽減し、パイプ集合体１３の全重量を軽減して、衝撃による損傷防止に寄与することができる。 According to the above configuration, in addition to the effects of the second embodiment, the weight reduction recesses 42d reduce the weight of the regulating members 33A and 33B, reduce the total weight of the pipe assembly 13, and contribute to the prevention of damage due to impact. can do.

（実施例４）
図１０（ａ），（ｂ）に示す規制部材３３Ａ（３３Ｂ）の本体部４３は、他の実施例３の軽量化凹部４２ｄを有する傾斜平面４１ｂの傾斜角αを４５°中心として±β(たとえば３０°)の範囲で変更したものである。これにより、実施例２，３に比較して、衝撃力の負荷方向により、曲げモーメントの衝撃力伝達状態に差異が生じるものの、他の実施例２の作用効果に加えて、製造を容易化することができる。 (Example 4)
The main body 43 of the regulating member 33A (33B) shown in FIGS. 10A and 10B is ± β (centered at an inclination angle α of the inclined plane 41b having the lightweight recess 42d of the third embodiment). For example, it is changed in the range of 30 °). As a result, as compared with Examples 2 and 3, the impact force transmission state of the bending moment differs depending on the load direction of the impact force, but in addition to the effects of the other Examples 2, the production is facilitated. be able to.

（実施例５）
図１１（ａ），（ｂ）に示す規制部材３３Ａ（３３Ｂ）の本体部３３ａは、交差部空間３１において、コーナ部外面３３jに互いに接する楕円形断面のパイプ形支持材４４ｅを、本体部３３ａを含む角パイプ１２の全長に沿って配置したものである。実施例１の作用効果に加えて、パイプ形支持材４４ｅにより、対角位置の規制部材３３Ａの本体部３３ａ間で、衝撃力を良好に伝達して支持することができる。またパイプ形支持材４４ｅが中空楕円であり、中実体と比べて軽量であるので、衝撃による損傷を効果的に防止することができる。 (Example 5)
The main body 33a of the regulation members 33A (33B) shown in FIGS. 11A and 11B is a pipe-shaped support member 44e having an elliptical cross section that is in contact with the outer surface 33j of the corner portion in the intersection space 31. It is arranged along the entire length of the square pipe 12 including. In addition to the effects of the first embodiment, the pipe-shaped support member 44e can satisfactorily transmit and support the impact force between the main bodies 33a of the diagonally positioned regulating member 33A. Further, since the pipe-shaped support member 44e has a hollow ellipse and is lighter than the medium substance, damage due to impact can be effectively prevented.

１０キャスク用バスケット
１２角パイプ
１２Ａ一方のＬ形材
１２Ｂ他方のＬ形材
１２ａ面板
１２ｂ面板
１２ｃ分割コーナ部
１２ｄ連結コーナ部
１２ｅ湾曲面
１３パイプ集合体
３１交差部空間
３１ｏ空間部中心
３２掛止部
３３Ａ主規制部材
３３Ｂ副規制部材
３３ａ本体部
３４第１鍵形突片
３４ａ開口部
３４ｂ段部
３５第２鍵形突片
３５ａ開口部
３５ｂ段部
３５ｃ凹入部 10 Cask basket 12 Square pipe 12A One L-shaped member 12B The other L-shaped member 12a Face plate 12b Face plate 12c Divided corner part 12d Connecting corner part 12e Curved surface 13 Pipe assembly 31 Crossing space 31o Space center 32 Hooking part 33A Main regulating member 33B Sub-regulating member 33a Main body 34 First key-shaped projecting piece 34a Opening 34b Step 35 Second key projecting piece 35a Opening 35b Step 35c Recess

Claims

A cask basket in which the four sides of a plurality of square pipes for accommodating spent fuel are arranged face-to-face and assembled in a grid-like cross section.
The square pipe is formed in a pair of L-shaped members divided into two at diagonally divided corners and a pair of divided corners of these L-shaped members, and is fitted in the vertical direction to connect the L-shaped members. A plurality of hooking portions, and a regulating member incorporated between the hooking portions at the vertical positions at the split corner portion of the square pipe to regulate the vertical displacement of the L-shaped member and prevent the hooking portion from coming off. , Equipped with
The regulating member has a main body portion having an L-shaped cross section that is engaged with a split corner portion, and is an intersection space in which corner portions of the four square pipes are arranged adjacent to each other. It is arranged along the split corner portion of the square pipe at one diagonal position, and is arranged in contact with the side surface of the adjacent square pipe facing each other, so that the impact force applied to the square pipe is adjacent to the square pipe. A cask basket characterized in that it can be transmitted to the square pipe.

The cask basket according to claim 1.
The square pipe has four corners formed in a curved and convex rounded cross section.
A cask basket characterized in that a curved concave corner portion inner surface that engages with the split corner portion of the square pipe is formed on the inner surface of the main body portion of the regulating member.

The cask basket according to claim 1 or 2.
The regulating member has an inclined plane formed on the opposite side of the inner surface of the corner portion.
The pair of restricting members arranged in the intersection space are formed in the same point-symmetrical cross section centered on the intersection space center, and the inclined plane is slidably abutted in the intersection space. A basket for cask that features.

The cask basket according to claim 1 or 2.
A cask basket characterized in that pipe-shaped support members having an elliptical cross section that are in contact with the outer surfaces of the corners of a pair of regulatory members arranged in the intersection space are arranged over the entire length of the square pipe.

The basket for cask according to any one of claims 1 to 4.
The hooking portion of one L-shaped member is a first key-shaped projecting piece having an opening formed on one end side in the length direction.
The hooking portion of the other L-shaped member is a second key-shaped projecting piece having an opening formed on the other end side in the length direction and fitted to the first key-shaped projecting piece.
The restricting member includes a main body portion arranged between the opposite side of the opening of the second key-shaped projecting piece and the opposite side of the opening of the first key-shaped projecting piece, and the hooking portion on one end side in the length direction. A cask characterized by having a first protruding piece arranged along one side portion and a second protruding piece arranged along the other side portion of the hooking portion on the other end side in the length direction. For basket.

The basket for cask according to any one of claims 1 to 5.
A basket for cask, characterized in that a neutron absorbing plate is interposed between the face plates of square pipes facing each other by the thickness of the regulating member.