JP2000121782A - Rack for storing spent fuel and method for manufacturing such rack - Google Patents
Rack for storing spent fuel and method for manufacturing such rackInfo
- Publication number
- JP2000121782A JP2000121782A JP11332375A JP33237599A JP2000121782A JP 2000121782 A JP2000121782 A JP 2000121782A JP 11332375 A JP11332375 A JP 11332375A JP 33237599 A JP33237599 A JP 33237599A JP 2000121782 A JP2000121782 A JP 2000121782A
- Authority
- JP
- Japan
- Prior art keywords
- partition plate
- partition plates
- spent fuel
- short
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、原子力発電所の使
用済燃料貯蔵設備に係り、しゃへい効果，耐震性に優れ
スペース効率を上げて使用済燃料集合体を高密度に貯蔵
し、高精度・高品質でかつ安価である使用済燃料貯蔵ラ
ック及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent fuel storage facility of a nuclear power plant, which is capable of storing spent fuel assemblies at a high density with excellent shielding effect, excellent seismic resistance and improved space efficiency, and having high precision and high accuracy. The present invention relates to a high quality and inexpensive spent fuel storage rack and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】従来の使用済燃料貯蔵ラックとしては、
特開昭55−1532号公報のような構造となっている。つま
り、図７ないし図９に示す様に複数個の角パイプ２３を
等間隔に並べてそれぞれの角パイプ２３間をスペーサ２
４にて連結しており、耐震性を向上させるために最外周
に存在する各角パイプ２３間の側面に補強部材２７また
は耐震用補強部材２５が溶接にて取付けられている。2. Description of the Related Art Conventional spent fuel storage racks include:
The structure is as shown in JP-A-55-1532. That is, as shown in FIGS. 7 to 9, a plurality of square pipes 23 are arranged at equal intervals, and
In order to improve the earthquake resistance, a reinforcing member 27 or an earthquake-resistant reinforcing member 25 is attached to a side surface between the square pipes 23 existing at the outermost periphery by welding.
【０００３】この構造においては、角パイプ２３の間に
はスペーサ２４を設けて連結していることにより各燃料
集合体相互間の距離が大きいことからスペース効率をさ
げている。In this structure, since the spacers 24 are provided between the square pipes 23 and connected to each other, the distance between the fuel assemblies is large, so that the space efficiency is reduced.
【０００４】また、各燃料集合体相互間には２つの角パ
イプ２３の側壁が存在していることおよび耐震上から補
強部材２７を取付けることから使用済燃料貯蔵ラック自
体の重量が重くなり、建屋に対する荷重が大きいという
問題点があった。Further, since the two side walls of the square pipe 23 exist between the fuel assemblies and the reinforcing member 27 is attached from the viewpoint of earthquake resistance, the weight of the spent fuel storage rack itself increases, and the building However, there is a problem that the load is large.
【０００５】この問題点の解決方法として特開平1−280
296 号公報記載の技術がある。つまり図６に示すように
複数個の角筒体２１を市松模様に配置することにより前
記のスペーサ２４が不要となりスペース効率が上がり、
さらに各燃料集合体相互間は角筒体２１の側壁のみとな
り軽量化され、かつ、角筒体２１の長手方向に接合部材
２２を複数個溶接することにより耐震性も優れたものと
なる。As a method for solving this problem, Japanese Patent Laid-Open Publication No.
There is a technique described in Japanese Patent Publication No. 296. In other words, by arranging a plurality of rectangular cylinders 21 in a checkered pattern as shown in FIG.
Furthermore, the space between the fuel assemblies is reduced only by the side wall of the rectangular cylinder 21, and the earthquake resistance is improved by welding a plurality of joining members 22 in the longitudinal direction of the rectangular cylinder 21.
【０００６】また、特開平1−269091 号公報において
は、図８に示すように、平板状の横板３１と複数枚の帯
状縦板３２とを複数段にわたり交互に積層し格子状に形
成している。In Japanese Unexamined Patent Publication No. 1-26991, as shown in FIG. 8, a flat horizontal plate 31 and a plurality of band-shaped vertical plates 32 are alternately laminated in a plurality of stages to form a lattice. ing.
【０００７】これは、帯状縦板に形成された突起３３と
平板状横板に形成された溝３４とを組合わせており、さ
らに組合わせ部の両隅を脚長の短かい軽度の隅肉溶接３
５によって接着している。In this method, a projection 33 formed on a strip-shaped vertical plate and a groove 34 formed on a flat horizontal plate are combined, and both corners of the combined portion are lightly fillet-welded with short leg lengths. 3
5 adhered.
【０００８】[0008]
【発明が解決しようとする課題】上記特開平1−280296
号公報では、市松模様に配列した角筒体２１の外壁面間
の距離２１ａが角筒体２１の内壁面間距離２１ｂと実質
的に等しくなるように配列する必要があり、隣接する角
筒体２１の双方のコーナ部分の曲率半径と接合部材２２
を使って両面間距離２１ａおよび２１ｂをおさえている
が、曲率半径部であることから両面間距離の精度を出す
ことが困難である。また、角筒体２１自体も精度よく製
作することが困難であることから寸法的に余裕をもった
少し大き目の角筒体２１にする必要がある。角筒体２１
の接合部材２２は長手方向に対して複数箇所設けている
が、コーナ部分の狭隘部での溶接となり信頼性に欠け
る。さらに、本溶接にて耐震性を持たせることから隅肉
溶接の溶着金属量が多くなり、ラック自体の変形が増加
する。また、隣接する角筒体２１の双方のコーナ部分の
接合部材２２のない部分は、角筒体２１間に隙間が生じ
燃料集合体相互のしゃへい効果が低下する。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the publication, the distance 21a between the outer wall surfaces of the rectangular cylinders 21 arranged in a checkerboard pattern needs to be arranged so as to be substantially equal to the distance 21b between the inner wall surfaces of the rectangular cylinders 21. 21 and the radius of curvature of the two corner portions and the joining member 22
Is used to control the distances 21a and 21b between the two surfaces, but it is difficult to obtain the accuracy of the distance between the two surfaces because of the radius of curvature. In addition, since it is difficult to manufacture the rectangular cylinder 21 itself with high accuracy, it is necessary to use a slightly larger rectangular cylinder 21 having a sufficient dimension. Square cylinder 21
Are provided at a plurality of positions in the longitudinal direction, but they are welded in a narrow portion of a corner portion and lack reliability. Further, since the main welding is provided with earthquake resistance, the amount of metal deposited in the fillet welding increases, and the deformation of the rack itself increases. In addition, at the corners of the adjacent square cylinders 21 where there is no joining member 22, a gap is formed between the square cylinders 21, and the shielding effect between the fuel assemblies is reduced.
【０００９】また、特開平1−269091 号公報では、突起
３３と溝３４との組合わせ寸法が非常に小さいため、耐
震性が弱く、かつ突起３３と溝３４の加工に時間がかか
る。さらに、隅肉溶接部３５が横板３１の上・下面の両
側を施工していることから自動溶接化が不可能である。In Japanese Patent Application Laid-Open No. 1-26991, the combination of the projection 33 and the groove 34 is very small, so that the earthquake resistance is weak and the processing of the projection 33 and the groove 34 takes time. Furthermore, since the fillet weld 35 is formed on both the upper and lower surfaces of the horizontal plate 31, automatic welding is impossible.
【００１０】上記問題点を解決するために本発明は、前
述の従来技術における欠点を補い、仕切板を複数枚格子
状に組合わせることにより耐震性、しゃへい効果に優
れ、スペース効率を上げ高精度，高品質でかつ安価であ
る使用済燃料貯蔵ラックを容易に提供することを目的と
する。In order to solve the above-mentioned problems, the present invention compensates for the above-mentioned drawbacks in the prior art, and has excellent seismic resistance and shielding effect by combining a plurality of partition plates in a lattice form, improving space efficiency and increasing precision. Another object of the present invention is to provide a high quality and low cost spent fuel storage rack easily.
【００１１】つまり、使用済燃料貯蔵ラックに求められ
る条件としては下記がある。That is, the conditions required for the spent fuel storage rack are as follows.
【００１２】使用済燃料貯蔵ラックは、冷却水が充満さ
れている燃料プール（図示せず）内に据付けられ、ラッ
ク内に設けられた仕切られた空間に使用済燃料集合体を
挿入し貯蔵している。The spent fuel storage rack is installed in a fuel pool (not shown) filled with cooling water, and a spent fuel assembly is inserted and stored in a partitioned space provided in the rack. ing.
【００１３】使用済燃料集合体相互間には側壁（中性子
しゃへい壁）および減速材である冷却水が充満している
間隙が存在することにより使用済燃料集合体の再臨界を
防止する必要がある（しゃへい効果）。[0013] It is necessary to prevent re-criticality of the spent fuel assembly due to the existence of a gap between the spent fuel assemblies, which is filled with side walls (neutron shielding walls) and cooling water as a moderator. (Shielding effect).
【００１４】また、使用済燃料集合体相互間の距離を可
能な限り小さくしかつラック全体の外形寸法を小さくし
スペース効率を上げることにより燃料プール内での燃料
貯蔵効率を上げる必要がある。Further, it is necessary to increase the fuel storage efficiency in the fuel pool by minimizing the distance between the spent fuel assemblies and reducing the outer dimensions of the entire rack to increase the space efficiency.
【００１５】使用済燃料集合体相互間の距離を小さくす
るためには、燃料貯蔵ラックの寸法精度をあげる必要が
ある。In order to reduce the distance between the spent fuel assemblies, it is necessary to improve the dimensional accuracy of the fuel storage rack.
【００１６】構造的には、耐震性の優れた構造が要求さ
れさらに軽量化し建屋に対する荷重を低減する必要があ
る。Structurally, a structure excellent in earthquake resistance is required, and it is necessary to further reduce the weight and the load on the building.
【００１７】[0017]
【課題を解決するための手段】前記目的を達成するため
に、仕切板を格子状に組合わせてなる使用済燃料貯蔵ラ
ックにおいて、仕切板の面間距離の位置決めを溶接によ
らずに機械加工交差により組合わせる方法として精度を
あげた。仕切板は、従来の接合部材を使用せずに仕切板
自体同志の組合わせ構造により一体化されるため耐震性
に優れており最終形状における最外部の耐震用バンドの
取付けが不要となる。従って、ラック自体の外形寸法を
小さくすることが可能となり、全体の燃料貯蔵効率をあ
げることができる上に、軽量化され建屋に対する荷重が
低減される。In order to achieve the above object, in a spent fuel storage rack in which partition plates are combined in a grid pattern, the distance between surfaces of the partition plates is determined by machining without welding. The accuracy was raised as a method of combining by intersection. Since the partition plate is integrated by a combination structure of the partition plates themselves without using a conventional joining member, the partition plate is excellent in seismic resistance and does not require an outermost anti-seismic band in the final shape. Therefore, the outer dimensions of the rack itself can be reduced, so that the overall fuel storage efficiency can be increased, and the weight is reduced and the load on the building is reduced.
【００１８】仕切板を格子上に組合わせることから、使
用済燃料集合体が挿入される仕切られた空間は隙間がな
く製造され使用済燃料集合体相互間には側壁で完全に仕
切られることから燃料貯蔵ラックの最重要項目であるし
ゃへい効果も充分である。Since the partition plates are combined on the grid, the separated space into which the spent fuel assemblies are inserted is manufactured without any gaps, and the spent fuel assemblies are completely partitioned by the side walls. The shielding effect, which is the most important item of the fuel storage rack, is also sufficient.
【００１９】さらに、しゃへい効果をあげるためには仕
切板を２枚平行に組立てその隙間に冷却材を保有するこ
とも可能である。Further, in order to improve the shielding effect, it is possible to assemble two partition plates in parallel and hold a coolant in the gap between them.
【００２０】その製造手順としては一方向から順序よく
組立が可能となり、溶接を下向き溶接とすることによっ
て自動溶接が採用でき高精度，高品質でかつ安価な使用
済燃料貯蔵ラックを得ることができる。As a manufacturing procedure, assembly can be performed in order from one direction, and automatic welding can be adopted by making the welding downward, so that a high-precision, high-quality and inexpensive spent fuel storage rack can be obtained.
【００２１】長尺仕切板に設けられた切込みは機械によ
り加工され、一方短尺仕切板の幅および凸部も機械によ
って加工されており、それぞれ組合わされることにより
仕切板の面間距離が精度よく製造される。長尺仕切板と
短尺仕切板との取付けは、長尺仕切板に設けられた切込
み部に差し込まれた短尺仕切板の凸部を栓溶接により行
なうが、差し込み部分が拘束されていることより溶接に
よる変形が押さえられる。さらに栓溶接のため溶接の裏
側からの空気の供給がしゃ断され、バックシールをしな
くても、高品質の溶接を得ることができる。The cuts provided in the long partition plate are machined, while the widths and projections of the short partition plate are also machined, so that the distance between the surfaces of the partition plate can be accurately determined by combining them. Manufactured. Attachment of the long partition plate and the short partition plate is performed by plug welding of the convex part of the short partition plate inserted into the cut part provided in the long partition plate, but welding is performed because the insertion part is restricted. The deformation due to is suppressed. Further, the supply of air from the back side of the welding is cut off by plug welding, so that high-quality welding can be obtained without back sealing.
【００２２】各部材がそれぞれ差し込み構造となってい
る事から耐震性に優れており、従来の耐震サポートが不
要となり、これによって構成部材の数が減少し、かつ外
形寸法が小さくできるため、全体の貯蔵密度をあげるこ
とができる。Since each member has a plug-in structure, it is excellent in seismic resistance, eliminating the need for a conventional seismic support, thereby reducing the number of components and reducing external dimensions. Storage density can be increased.
【００２３】製造手順としては一方向より順に組立てが
可能であり、図５に示すように自動溶接が可能となる。As a manufacturing procedure, assembling can be performed sequentially from one direction, and automatic welding can be performed as shown in FIG.
【００２４】また、従来は角筒体の接合は長手方向に複
数個の接合用部材を溶接して行なっていたが、接合部以
外は角筒体同志に隙間が生じていた。本発明において
は、すべて仕切板にて囲まれており隙間がないため燃料
間のしゃへい効果に優れている。Conventionally, a plurality of joining members are welded in the longitudinal direction by joining a plurality of joining members in a longitudinal direction. In the present invention, since all are surrounded by the partition plate and there is no gap, the shielding effect between fuels is excellent.
【００２５】さらに、仕切板を２枚平行に組立てその隙
間に冷却材を保有することによりしゃへい効果をあげる
ことが可能である。Further, the shielding effect can be enhanced by assembling two partition plates in parallel and holding a coolant in the gap therebetween.
【００２６】[0026]
【発明の実施の形態】本発明による一実施例を、図１な
いし図５により説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS.
【００２７】図１は本発明による使用済燃料貯蔵ラック
の全体斜視図で、長尺仕切板１と短尺仕切板２とを格子
状に組合わせて各仕切板間の距離すなわち長尺仕切板面
間距離１３ａ，短尺仕切板面間距離１３ｂを実質的に等
しくなるように切込み部および短尺仕切板２の幅を有し
ている。FIG. 1 is an overall perspective view of a spent fuel storage rack according to the present invention, in which a long partition plate 1 and a short partition plate 2 are combined in a lattice pattern, and the distance between the partition plates, that is, the long partition plate surface. The width of the cut portion and the width of the short partition plate 2 are set so that the distance 13a and the distance 13b between the short partition plates are substantially equal.
【００２８】図２は本発明による長尺仕切板１の一例を
示す鳥瞰図で、長手方向に複数の下部切込み部６および
上部切込み７を有している。FIG. 2 is a bird's-eye view showing an example of the long partition plate 1 according to the present invention, which has a plurality of lower cuts 6 and upper cuts 7 in the longitudinal direction.
【００２９】図３は本発明による短尺仕切板２の一例を
示す鳥瞰図で、長手方向に複数の下部凸部８および上部
凸部９を有している。FIG. 3 is a bird's-eye view showing an example of the short partition plate 2 according to the present invention, which has a plurality of lower projections 8 and upper projections 9 in the longitudinal direction.
【００３０】図４はラック製作段階における仕切板の組
立途中状態を示している。FIG. 4 shows a state in which the partition plate is being assembled in the rack manufacturing stage.
【００３１】長尺仕切板１に設けられた下部切込み部６
に短尺仕切板２に設けられた下部凸部８を挿入組込み、
長尺仕切板１と短尺仕切板２のそれぞれの交点を溶接に
よって施された下部溶着金属１０，１１にて一体化され
ている。The lower notch 6 provided on the long partition plate 1
The lower convex portion 8 provided on the short partition plate 2 is inserted and assembled.
The intersections of the long partition plate 1 and the short partition plate 2 are integrated by lower welding metals 10 and 11 which are provided by welding.
【００３２】下部溶着金属１０，１１は溶接変形を少な
くするために短尺仕切板２の左右にそれぞれ断続的に千
鳥形に配列される。The lower welding metals 10 and 11 are intermittently arranged on the left and right sides of the short partition plate 2 in order to reduce welding deformation.
【００３３】また、長尺仕切板１に設けられた上部切込
部７に短尺仕切板２に設けられた上部凸部９を挿入組込
み、この部分を栓溶接によって施された上部溶着金属１
２にて一体化されている。上記の組立手順を下部側より
順次施工することにより使用済燃料貯蔵ラックを構成す
る。The upper convex portion 9 provided on the short partition plate 2 is inserted into the upper cut portion 7 provided on the long partition plate 1, and this portion is inserted into the upper weld metal 1 provided by plug welding.
2 are integrated. The spent fuel storage rack is constructed by sequentially performing the above assembly procedure from the lower side.
【００３４】最終的に側部仕切板３および底板４を仕切
板と同様に差し込み溶接され、ラックの支持脚５を溶接
により取付けて使用済燃料貯蔵ラックが完成される。Finally, the side partition plate 3 and the bottom plate 4 are inserted and welded in the same manner as the partition plate, and the support legs 5 of the rack are attached by welding to complete the spent fuel storage rack.
【００３５】かかる構造の場合、仕切板間距離すなわち
長尺仕切板面間距離１３ａおよび短尺仕切板面間距離１
３ｂは、長尺仕切板１に設けられた上・下部切込み６，
７と隣りの列の上・下部切込み６，７との間の距離およ
び短尺仕切板２の幅寸法により決定されるが、そのいず
れも機械により加工が可能であり高精度にできる。さら
に長尺仕切板１に設けられた上・下部切込み６，７と短
尺仕切板２に設けられた上・下部凸部９，８がそれぞれ
組合わされること、かつ下から順序よく組立が可能であ
りすべての溶接が最も作業性の良好な下向溶接ができる
ことから溶接による歪を最少限にすることができる。In the case of such a structure, the distance between the partition plates, ie, the distance 13a between the long partition plates and the distance 1 between the short partition plates 1
3b are upper and lower cuts 6, provided in the long partition plate 1.
It is determined by the distance between the upper and lower cuts 6 and 7 in the adjacent row and the width of the short partition plate 2, all of which can be machined and have high precision. Further, the upper and lower cuts 6, 7 provided on the long partition plate 1 and the upper and lower projections 9, 8 provided on the short partition plate 2 are respectively combined, and assembly can be performed in order from below. Since all welding can perform downward welding with the best workability, distortion due to welding can be minimized.
【００３６】また、構成部材がすべて板材であり製作時
の部品類の保管・組立スペースが少なくて作業ができ
る。In addition, since all the constituent members are plate members, there is little space for storing and assembling parts at the time of manufacture, and work can be performed.
【００３７】図５に、本発明による使用済燃料貯蔵ラッ
クの組立作業状態の一実施例を示すが自動化による製作
が可能となる。FIG. 5 shows an embodiment of an assembly operation state of a spent fuel storage rack according to the present invention, which can be manufactured by automation.
【００３８】構造が、長尺仕切板１に設けられた切込み
部６，７に差し込まれた短尺仕切板２の凸部８，９を溶
着金属１０，１１，１２にて一体化しており差し込み部
が拘束されていることから耐震性に優れている。The structure is such that the projections 8 and 9 of the short partition plate 2 inserted into the cut portions 6 and 7 provided on the long partition plate 1 are integrated by welding metals 10, 11 and 12, and the insertion portion is formed. Has excellent seismic resistance.
【００３９】従って、特別に耐震用のバンドおよびサポ
ート等の設置が不要となる。この事より使用済燃料貯蔵
ラック自体の外形寸法が小さくできることより、貯蔵プ
ール全体スペースにおいては貯蔵密度をあげることがで
きる。Therefore, there is no need to install a special earthquake-resistant band and support. As a result, the outer dimensions of the spent fuel storage rack itself can be reduced, and the storage density can be increased in the entire storage pool space.
【００４０】さらに、仕切板を格子状に組立てられてお
り仕切板間には隙間がないことから貯蔵燃料間が完全に
仕切られている状態となっている。これによりそれぞれ
の燃料間の放射能しゃへい効果が優れている。Further, the partition plates are assembled in a grid pattern, and there is no gap between the partition plates, so that the storage fuel is completely partitioned. Thereby, the radiation shielding effect between the respective fuels is excellent.
【００４１】長尺仕切板１および短尺仕切板２の素材と
して中性子吸収材のボロンを含有されたステンレス鋼を
使用することによりさらにしゃへい効果をあげることが
できる。The shielding effect can be further enhanced by using stainless steel containing boron as a neutron absorbing material as a material of the long partition plate 1 and the short partition plate 2.
【００４２】他の実施例として、長尺仕切板１および短
尺仕切板２，２′をそれぞれ２枚隙間を設けた構造と
し、長尺仕切板間の冷却水保有空間２９および短尺仕切
板間の冷却水保有空間３０に冷却水を保有することによ
り貯蔵燃料間の放射能しゃヘい効果をさらに優れたもの
にすることができる。この２枚構造の仕切板の組立ても
前記と同様に下部切り込み６，上部切り込み７および下
部凸部８，上部凸部９を組合わせた上で製造する。As another embodiment, the long partition plate 1 and the short partition plates 2 and 2 'have a structure in which two gaps are provided, and the cooling water holding space 29 between the long partition plates and the short partition plate 2 and 2' are provided. By holding the cooling water in the cooling water holding space 30, the radiation shielding effect between the stored fuels can be further improved. Even in the case of assembling the partition plate having the two-sheet structure, the lower cut 6, the upper cut 7, the lower convex portion 8, and the upper convex portion 9 are assembled in the same manner as described above.
【００４３】[0043]
【発明の効果】以上の如く、本発明によれば、全体の貯
蔵密度をあげたうえ安価に高精度でかつ信頼性の高い使
用済燃料貯蔵ラックの製作ができる。更に、次のような
効果を達成できる。As described above, according to the present invention, a high-precision and highly reliable spent fuel storage rack can be manufactured inexpensively while increasing the overall storage density. Further, the following effects can be achieved.
【００４４】(１) 仕切板に切込みを設けて組立てるた
め仕切板間の寸法精度が良く、さらに溶接による歪の発
生をおさえることができる。(1) Since the partition plates are provided with cuts and assembled, the dimensional accuracy between the partition plates is good, and the occurrence of distortion due to welding can be suppressed.
【００４５】(２) 組立溶接は下向き溶接が可能であり
自動溶接化の適用ができ高品質の製品が少ない工数で得
られる。(2) In assembly welding, downward welding is possible, automatic welding can be applied, and high-quality products can be obtained with a small number of man-hours.
【００４６】(３) 枠板を使用するため、製作時の部品
類の保管・組立スペースが少なくてよい。(3) Since the frame plate is used, a space for storing and assembling parts at the time of manufacturing may be small.
【００４７】(４) 溶接一体構造であるため耐震性に優
れている事から耐震用バンドが不要となり、外形寸法を
小さくすることができ全体の貯蔵密度をあげることがで
きる。(4) Since it is a single-piece welded structure, it has excellent seismic resistance, so that no seismic band is required, the external dimensions can be reduced, and the overall storage density can be increased.
【００４８】(５) 燃料自体は個々に仕切板にて仕切ら
れており、隣接の燃料との間には隙間がなく放射能しゃ
へい効果が優れている。(5) The fuel itself is separated by a partition plate, and there is no gap between adjacent fuels, so that the radiation shielding effect is excellent.
【００４９】(６) 特殊な製法となる角筒体の製作が不
要となり単純な板材の組立構造であり製作工数が少なく
て製造できる。(6) It is not necessary to manufacture a rectangular cylinder which is a special manufacturing method, so that it is a simple plate material assembly structure and can be manufactured with a small number of manufacturing steps.
【００５０】(７) 仕切板を等間隔に２枚平行に取りつ
け２重構造とし、その隙間に冷却水を保有することによ
り優れた放射能しゃへい効果を得ることができる。(7) An excellent radiation shielding effect can be obtained by installing two partition plates in parallel at equal intervals to form a double structure and holding cooling water in the gaps.
【図１】本発明の使用済燃料貯蔵ラックの全体斜視図の
実施例を示す説明図。FIG. 1 is an explanatory view showing an embodiment of an overall perspective view of a spent fuel storage rack of the present invention.
【図２】使用済燃料貯蔵ラックの長尺仕切板の形状を示
す説明図。FIG. 2 is an explanatory view showing the shape of a long partition plate of a spent fuel storage rack.
【図３】使用済燃料貯蔵ラックの短尺仕切板の形状を示
す説明図。FIG. 3 is an explanatory view showing a shape of a short partition plate of the spent fuel storage rack.
【図４】仕切板の組立手順状態を示す説明図である。FIG. 4 is an explanatory view showing a procedure of assembling a partition plate.
【図５】本発明による使用済燃料貯蔵ラックの組立作業
状態の一実施例である。FIG. 5 is an embodiment of an assembly operation state of a spent fuel storage rack according to the present invention.
【図６】従来の使用済燃料貯蔵ラックの部分平断面図で
ある。FIG. 6 is a partial plan sectional view of a conventional spent fuel storage rack.
【図７】従来の使用済燃料貯蔵ラックの部分平断面図で
ある。FIG. 7 is a partial plan sectional view of a conventional spent fuel storage rack.
【図８】従来の使用済燃料貯蔵ラックの部分平断面図で
ある。FIG. 8 is a partial plan sectional view of a conventional spent fuel storage rack.
【図９】従来の使用済燃料貯蔵ラックの実施例の全体斜
視図である。FIG. 9 is an overall perspective view of a conventional spent fuel storage rack according to an embodiment.
【図１０】従来の使用済燃料貯蔵ラックの実施例の全体
斜視図である。FIG. 10 is an overall perspective view of an embodiment of a conventional spent fuel storage rack.
【図１１】仕切板を２重構造とした実施例を示す説明図
である。FIG. 11 is an explanatory view showing an embodiment in which a partition plate has a double structure.
１…長尺仕切板、２…短尺仕切板、２′…２重構造とし
た短尺仕切板、３…側部仕切板、４…底板、５…ラック
の支持脚、６…下部切込み、７…上部切込み、８…下部
凸部、９…上部凸部、１０，１１…下部溶着金属、１２
…上部溶着金属、１３ａ…長尺仕切板面間距離、１３ｂ
…短尺仕切板面間距離、１４…自動溶接ロボット、１５
…昇降装置、２１…角筒体、２１ａ…角筒体の内壁面間
距離、２１ｂ…角筒体の外壁面間距離、２２…接合部
材、２３…角パイプ、２４…スペーサ、２５…耐震用補
強部材、２６…ラックの支持脚、２７…補強部材、２８
…ラックの支持脚、２９…長尺仕切板間の冷却水保有空
間、３０…短尺仕切板間の冷却水保有空間、３１…平板
状横板、３２…帯状縦板、３３…帯状縦板に形成された
突起、３４…平板状横板に形成された溝、３５…隅肉溶
接部。DESCRIPTION OF SYMBOLS 1 ... Long partition plate, 2 ... Short partition plate, 2 '... Double-structured short partition plate, 3 ... Side partition plate, 4 ... Bottom plate, 5 ... Rack support leg, 6 ... Lower cut, 7 ... Upper notch, 8: lower convex portion, 9: upper convex portion, 10, 11: lower weld metal, 12
... upper weld metal, 13a ... distance between long partition plates, 13b
… Distance between short partition plates, 14… Automatic welding robot, 15
... Elevating device, 21 ... Square cylindrical body, 21a ... Distance between inner wall surfaces of the square cylindrical body, 21b ... Distance between outer wall surfaces of the square cylindrical body, 22 ... Joining member, 23 ... Square pipe, 24 ... Spacer, 25 ... Seismic resistance Reinforcement member, 26: rack support leg, 27: reinforcement member, 28
... Rack support legs, 29 ... Cooling water holding space between long partition plates, 30 ... Cooling water holding space between short partition plates, 31 ... Horizontal plate, 32 ... Vertical plate, 33 ... Vertical plate Protrusions formed, 34 ... grooves formed in a flat horizontal plate, 35 ... fillet welds.
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１１年１２月２１日（１９９９．１２．
２１）[Submission date] December 21, 1999 (1999.12.
21)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 使用済燃料貯蔵ラック及びその製造方
法Patent application title: Spent fuel storage rack and method of manufacturing the same
【特許請求の範囲】[Claims]
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、使用済燃料貯蔵ラ
ック及びその製造方法に係り、特に、燃料プール内に据
え付けるのに好適な使用済燃料貯蔵ラック及びその製造
方法に関する。The present invention relates to a spent fuel storage rack and a method of manufacturing the same, and more particularly, to a spent fuel storage rack suitable for being installed in a fuel pool and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来の使用済燃料貯蔵ラックとしては、
特開昭55−1532号公報のような構造となっている。つま
り、図７ないし図９に示す様に複数個の角パイプ２３を
等間隔に並べてそれぞれの角パイプ２３間をスペーサ２
４にて連結しており、耐震性を向上させるために最外周
に存在する各角パイプ２３間の側面に補強部材２７また
は耐震用補強部材２５が溶接にて取付けられている。こ
の構造においては、角パイプ２３の間にはスペーサ２４
を設けて連結していることにより各燃料集合体相互間の
距離が大きいことからスペース効率をさげている。2. Description of the Related Art Conventional spent fuel storage racks include:
The structure is as shown in JP-A-55-1532. That is, as shown in FIGS. 7 to 9, a plurality of square pipes 23 are arranged at equal intervals, and
In order to improve the earthquake resistance, a reinforcing member 27 or an earthquake-resistant reinforcing member 25 is attached to a side surface between the square pipes 23 existing at the outermost periphery by welding. In this structure, a spacer 24 is provided between the square pipes 23.
The space efficiency is reduced because the distance between the fuel assemblies is large by providing and connecting the fuel assemblies.
【０００３】また、各燃料集合体相互間には２つの角パ
イプ２３の側壁が存在していることおよび耐震上から補
強部材２７を取付けることから使用済燃料貯蔵ラック自
体の重量が重くなり、建屋に対する荷重が大きいという
問題点があった。Further, since the two side walls of the square pipe 23 exist between the fuel assemblies and the reinforcing member 27 is attached from the viewpoint of earthquake resistance, the weight of the spent fuel storage rack itself becomes heavy, and the building However, there is a problem that the load is large.
【０００４】この問題点の解決方法として特開平1−280
296 号公報記載の技術がある。つまり図６に示すように
複数個の角筒体２１を市松模様に配置することにより前
記のスペーサ２４が不要となりスペース効率が上がり、
さらに各燃料集合体相互間は角筒体２１の側壁のみとな
り軽量化され、かつ、角筒体２１の長手方向に接合部材
２２を複数個溶接することにより耐震性も優れたものと
なる。As a method for solving this problem, Japanese Patent Laid-Open Publication No.
There is a technique described in Japanese Patent Publication No. 296. In other words, by arranging a plurality of rectangular cylinders 21 in a checkered pattern as shown in FIG.
Furthermore, the space between the fuel assemblies is reduced only by the side wall of the rectangular cylinder 21, and the earthquake resistance is improved by welding a plurality of joining members 22 in the longitudinal direction of the rectangular cylinder 21.
【０００５】また、特開平1−269091 号公報において
は、図８に示すように、平板状の横板３１と複数枚の帯
状縦板３２とを複数段にわたり交互に積層し格子状に形
成している。In Japanese Unexamined Patent Publication No. 1-26991, as shown in FIG. 8, a flat horizontal plate 31 and a plurality of band-shaped vertical plates 32 are alternately laminated in a plurality of stages to form a lattice. ing.
【０００６】これは、帯状縦板に形成された突起３３と
平板状横板に形成された溝３４とを組合わせており、さ
らに組合わせ部の両隅を脚長の短かい軽度の隅肉溶接３
５によって接着している。In this method, a projection 33 formed on a strip-shaped vertical plate and a groove 34 formed on a flat horizontal plate are combined, and both corners of the combined portion are lightly welded with short fillet length. 3
5 adhered.
【０００７】[0007]
【発明が解決しようとする課題】上記特開平1−280296
号公報では、市松模様に配列した角筒体２１の外壁面間
の距離２１ａが角筒体２１の内壁面間距離２１ｂと実質
的に等しくなるように配列する必要があり、隣接する角
筒体２１の双方のコーナ部分の曲率半径と接合部材２２
を使って両面間距離２１ａおよび２１ｂをおさえている
が、曲率半径部であることから両面間距離の精度を出す
ことが困難である。また、角筒体２１自体も精度よく製
作することが困難であることから寸法的に余裕をもった
少し大きめの角筒体２１にする必要がある。角筒体２１
の接合部材２２は長手方向に対して複数箇所設けている
が、コーナ部分の溶接にて耐震性を持たせることから隅
肉溶接の溶着金属量が多くなり、ラック自体の変形が増
加する。また、隣接する角筒体２１の双方のコーナ部分
の接合部材２２のない部分は、角筒体２１間に隙間が生
じ燃料集合体相互のしゃへい効果が低下する。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the publication, the distance 21a between the outer wall surfaces of the rectangular cylinders 21 arranged in a checkerboard pattern needs to be arranged so as to be substantially equal to the distance 21b between the inner wall surfaces of the rectangular cylinders 21. 21 and the radius of curvature of the two corner portions and the joining member 22
Is used to control the distances 21a and 21b between the two surfaces, but it is difficult to obtain the accuracy of the distance between the two surfaces because of the radius of curvature. In addition, since it is difficult to manufacture the rectangular cylinder 21 itself with high accuracy, it is necessary to make the rectangular cylinder 21 slightly larger with a margin in dimension. Square cylinder 21
Are provided at a plurality of positions in the longitudinal direction. However, since the corner portions are provided with earthquake resistance, the amount of welded metal in the fillet welding increases, and the deformation of the rack itself increases. In addition, at the corners of the adjacent square cylinders 21 where there is no joining member 22, a gap is formed between the square cylinders 21, and the shielding effect between the fuel assemblies is reduced.
【０００８】また、特開平1−269091 号公報では、突起
３３と溝３４との組合わせ寸法が非常に小さいため、耐
震性が弱く、かつ突起３３と溝３４の加工に時間がかか
る。In Japanese Patent Application Laid-Open No. 1-26991, since the combination of the projection 33 and the groove 34 is very small, the earthquake resistance is weak, and the processing of the projection 33 and the groove 34 takes time.
【０００９】本発明の目的は、溶接による変形を少なく
でき、かつ燃料プール内での使用済燃料集合体の貯蔵密
度を増加できる使用済燃料貯蔵ラック及びその製造方法
を提供することにある。An object of the present invention is to provide a spent fuel storage rack and a method of manufacturing the same, which can reduce deformation due to welding and can increase the storage density of spent fuel assemblies in a fuel pool.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成する第１
発明の特徴は、仕切板を格子状に配置して構成され、前
記仕切板で囲まれかつそれぞれに１体の使用済燃料集合
体を収納する複数の空間が形成された使用済燃料貯蔵ラ
ックであって、前記空間を複数配置できる幅を有し、貫
通してなる複数のスリットを有する複数の第１仕切板
と、１つの前記空間の幅を有して２つの前記第１仕切板
間に配置され、第1端面において長手方向に配置された
複数の第１突起部を有し、かつ前記第１端面とは別の第
２端面において長手方向に配置された複数の第２突起部
を有する複数の第２仕切板と、前記第１突起部が前記第
２仕切板の前記第１端面に対向する一方の前記第１仕切
板の前記スリットに挿入された状態で、前記第２仕切板
と前記一方の第１仕切板とを断続的に接合した第１溶接
部と、前記第２突起部が前記第２仕切板の前記第２端面
に対向する他方の前記第１仕切板の前記スリットに挿入
された状態で、前記第２仕切板と前記他方の第１仕切板
とを断続的に接合した第２溶接部とを備えたことにあ
る。A first aspect of the present invention for achieving the above object is as follows.
A feature of the present invention is a spent fuel storage rack which is configured by arranging partition plates in a lattice shape, and which is surrounded by the partition plates and has a plurality of spaces formed therein for accommodating one spent fuel assembly. There is a plurality of first partition plates having a width capable of arranging the plurality of spaces and having a plurality of slits penetrating therethrough, and having a width of one space between the two first partition plates. A plurality of first protrusions arranged in a longitudinal direction on a first end face, and a plurality of second protrusions arranged in a longitudinal direction on a second end face different from the first end face. A plurality of second partition plates, wherein the first protrusion is inserted into the slit of one of the first partition plates facing the first end surface of the second partition plate, and A first welded portion intermittently joined to the one first partition plate, and the second protrusion Is intermittently joined to the second partition plate while the second partition plate is inserted into the slit of the other first partition plate facing the second end face of the second partition plate. And a second welded portion.
【００１１】上記目的を達成する第２発明の特徴は、仕
切板を格子状に配置して構成され、前記仕切板で囲まれ
かつそれぞれに１体の使用済燃料集合体を収納する複数
の空間が形成された使用済燃料貯蔵ラックの製造方法で
あって、前記空間を複数配置できる幅を有し、貫通して
なる複数のスリットを有する複数の第１仕切板を形成す
る工程と、１つの前記空間の幅を有し、一方の前記第１
仕切板に対向する第1端面において長手方向に配置され
た複数の第１突起部を有し、かつ他方の前記第１仕切板
に対向する第２端面において長手方向に配置された複数
の第２突起部を有する複数の第２仕切板を形成する工程
と、各々の前記第２仕切板の前記第２突起部を、前記他
方の第１仕切板の前記スリット内に挿入する工程と、前
記第２突起部が前記他方の第１仕切板の前記スリット内
に挿入された状態で、前記各々の第２仕切板とその他方
の第１仕切板とを断続的に溶接する工程と、各々の前記
第２仕切板の前記第１突起部を、前記一方の第１仕切板
の前記スリット内に挿入する工程と、前記第１突起部が
前記一方の第１仕切板の前記スリット内に挿入された状
態で、前記各々の第２仕切板とその一方の第１仕切板と
を断続的に溶接する工程とを有することにある。A second feature of the present invention to achieve the above-mentioned object is that a plurality of spaces are formed by arranging partition plates in a grid pattern, and are surrounded by the partition plates and each store a single spent fuel assembly. Forming a plurality of first partition plates having a width capable of arranging a plurality of the spaces and having a plurality of slits formed therethrough; and Having the width of the space, one of the first
A plurality of second protrusions having a plurality of first protrusions arranged in a longitudinal direction on a first end face opposed to the partition plate, and being arranged in a longitudinal direction on a second end face opposed to the other first partition plate. Forming a plurality of second partition plates having protrusions; inserting the second protrusions of each of the second partition plates into the slits of the other first partition plate; (2) intermittently welding each of the second partition plates and the other first partition plate in a state where the protrusions are inserted into the slits of the other first partition plate; A step of inserting the first projection of the second partition into the slit of the one first partition; and a step of inserting the first projection into the slit of the one first partition. In this state, each of the second partition plates and one of the first partition plates are intermittently welded. And a process.
【００１２】第１発明は、第２仕切板の第１端面に設け
られた第１突起部を一方の第１仕切板のスリット内に挿
入し、第２仕切板の第２端面に設けられた第２突起部を
他方の第１仕切板のスリット内に挿入するので、各第１
仕切板に対する第２仕切板の位置決めが簡単にできる。
更に、各々の第２仕切板と他方の第１仕切板とを断続的
に溶接し、また、各々の第２仕切板と一方の第１仕切板
とを断続的に溶接するので、溶接による変形が少なくな
る。第２発明も、同様な効果を生じる。In the first invention, the first projection provided on the first end surface of the second partition plate is inserted into the slit of one of the first partition plates and provided on the second end surface of the second partition plate. Since the second protrusion is inserted into the slit of the other first partition plate,
The positioning of the second partition plate with respect to the partition plate can be easily performed.
Furthermore, since each second partition plate and the other first partition plate are intermittently welded, and each second partition plate and one of the first partition plates are intermittently welded, deformation due to welding is performed. Is reduced. The second invention produces the same effect.
【００１３】特に、第１及び第２突起部が第２仕切板の
長手方向に複数存在するので、長手方向における第２仕
切板の位置決めも簡単にできる。In particular, since a plurality of the first and second projections exist in the longitudinal direction of the second partition plate, the positioning of the second partition plate in the longitudinal direction can be easily performed.
【００１４】更に、第１発明は、第１突起部を一方の第
１仕切板のスリット内に挿入し、第２突起部を他方の第
１仕切板のスリット内に挿入するので、一方の第１仕切
板と他方の第１仕切板との間の寸法精度、及びこれらの
第１仕切板の位置決め精度が向上し、溶接による第２仕
切板の歪の発生を著しく抑制できる。また、各第１仕切
板と各第２仕切板が溶接一体構造であるため、従来必要
とされていた耐震用バンドが不要になる。これらのこと
から、燃料プール内での使用済燃料集合体の貯蔵密度が
著しく増加する。Further, in the first invention, the first projection is inserted into the slit of one first partition plate, and the second projection is inserted into the slit of the other first partition plate. The dimensional accuracy between one partition plate and the other first partition plate and the positioning accuracy of these first partition plates are improved, and the occurrence of distortion of the second partition plate due to welding can be significantly suppressed. In addition, since each of the first partition plates and each of the second partition plates have a welded integral structure, a conventionally required earthquake-resistant band is not required. For these reasons, the storage density of the spent fuel assemblies in the fuel pool is significantly increased.
【００１５】[0015]
【発明の実施の形態】本発明による一実施例である使用
済燃料貯蔵ラックを、図１乃至図５により説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A spent fuel storage rack according to an embodiment of the present invention will be described with reference to FIGS.
【００１６】本実施例の使用済燃料貯蔵ラックは、複数
の長尺仕切板１及び複数の短尺仕切板２を有する。長尺
仕切板１と短尺仕切板２とは格子状に組合わされ、各仕
切板間の距離、すなわち長尺仕切板面間距離１３ａ，短
尺仕切板面間距離１３ｂが実質的に等しい。これは、長
尺仕切板１に設けられた切込み部（貫通孔）の間隔が短
尺仕切板２の幅と等しいからである。The spent fuel storage rack of this embodiment has a plurality of long partition plates 1 and a plurality of short partition plates 2. The long partition plate 1 and the short partition plate 2 are combined in a lattice pattern, and the distance between the partition plates, that is, the distance 13a between the long partition plates and the distance 13b between the short partition plates are substantially equal. This is because the interval between the cut portions (through holes) provided in the long partition plate 1 is equal to the width of the short partition plate 2.
【００１７】長尺仕切板１は、図２に示すように、長手
方向に複数の下部切込み部６及び複数の上部切込み部７
を有する。下部切込み部６及び上部切込み部７は、一列
に交互に形成される。短尺仕切板２は、図３に示すよう
に、一端面の長手方向に複数の下部凸部８を、他の端面
の長手方向に複数の上部凸部９を有している。As shown in FIG. 2, the long partition plate 1 has a plurality of lower cuts 6 and a plurality of upper cuts 7 in the longitudinal direction.
Having. The lower cuts 6 and the upper cuts 7 are alternately formed in a line. As shown in FIG. 3, the short partition plate 2 has a plurality of lower protrusions 8 in the longitudinal direction of one end surface and a plurality of upper protrusions 9 in the longitudinal direction of the other end surface.
【００１８】本実施例の使用済燃料貯蔵ラックの組立て
の途中段階を、図４に示している。水平方向に置かれた
長尺仕切板１の下部切込み部６に、短尺仕切板２の一端
面に設けられた下部凸部８を組込む。この状態で、長尺
仕切板１と短尺仕切板２は、それぞれの交点を上方から
の溶接によって施された下部溶着金属１０，１１にて一
体化されている。短尺仕切板２は、長尺仕切板１に対し
て垂直方向に立てられている。下部溶着金属１０，１１
は、長尺仕切板１及び短尺仕切板２の溶接変形を少なく
するために、短尺仕切板２の左右にそれぞれ断続的に、
特に千鳥形に配列される。１つの短尺仕切板２の長尺仕
切板１への溶接が終了した後、その短尺仕切板２と平行
に配置される別の短尺仕切板２の下部凸部８が長尺仕切
板１の他の下部切込み部６に組み込まれ、前述のように
長尺仕切板１と短尺仕切板２との交点での溶接が行われ
る。FIG. 4 shows an intermediate stage of assembling the spent fuel storage rack of this embodiment. The lower projection 8 provided on one end surface of the short partition plate 2 is incorporated into the lower cut portion 6 of the long partition plate 1 placed in the horizontal direction. In this state, the long partition plate 1 and the short partition plate 2 are integrated by the lower welding metals 10 and 11 in which the respective intersections are welded from above. The short partition plate 2 stands upright with respect to the long partition plate 1. Lower weld metal 10, 11
In order to reduce welding deformation of the long partition plate 1 and the short partition plate 2, the left and right of the short partition plate 2 are intermittently respectively.
In particular, they are arranged in a staggered pattern. After the welding of one short partition plate 2 to the long partition plate 1 is completed, the lower convex portion 8 of another short partition plate 2 arranged in parallel with the short partition plate 2 is connected to the other of the long partition plate 1. At the intersection of the long partition plate 1 and the short partition plate 2 as described above.
【００１９】一列に配置される短尺仕切板２の長尺仕切
板１への溶接が終了した後、これらの短尺仕切板２の複
数の上部凸部９が、これらの短尺仕切板２の上方に位置
される他の長尺仕切板１の複数の上部切込部７に組み込
まれる。短尺仕切板２の複数の上部凸部９は、他の長尺
仕切板１の上面よりの栓溶接によって施された上部溶着
金属１２にて他の長尺仕切板１と一体化されている。上
記の組立手順を下部側より順次上方に向かって施工する
ことにより、使用済燃料貯蔵ラックが組み立てられる。After the welding of the short partitions 2 arranged in a line to the long partitions 1 is completed, the plurality of upper projections 9 of these short partitions 2 are placed above these short partitions 2. It is incorporated into a plurality of upper cut portions 7 of another long partition plate 1 to be positioned. The plurality of upper convex portions 9 of the short partition plate 2 are integrated with the other long partition plate 1 by an upper weld metal 12 which is formed by plug welding from the upper surface of the other long partition plate 1. The spent fuel storage rack is assembled by sequentially performing the above assembling procedure upward from the lower side.
【００２０】最終的に、短尺仕切板２の凸部が、上記と
同様に、側部仕切板３及び底板４の切込部内に組み込ま
れ、短尺仕切板２が側部仕切板３及び底板４に溶接され
る。その後、ラックの支持脚５が底板４に溶接により取
付けられて使用済燃料貯蔵ラックが完成される。Finally, the projections of the short partition plate 2 are assembled into the cut portions of the side partition plate 3 and the bottom plate 4 in the same manner as described above, and the short partition plate 2 is connected to the side partition plate 3 and the bottom plate 4. To be welded. After that, the support legs 5 of the rack are attached to the bottom plate 4 by welding to complete the spent fuel storage rack.
【００２１】長尺仕切板１および短尺仕切板２の素材と
して中性子吸収材のボロンを含有されたステンレス鋼を
使用することによりさらにしゃへい効果をあげることが
できる。The use of stainless steel containing boron as a neutron absorbing material as a material of the long partition plate 1 and the short partition plate 2 can further enhance the shielding effect.
【００２２】本実施例の構造によれば、仕切板間距離す
なわち長尺仕切板面間距離１３ａおよび短尺仕切板面間
距離１３ｂは、長尺仕切板１に設けられた上・下部切込
み６，７と隣りの列の上・下部切込み６，７との間の距
離および短尺仕切板２の幅寸法により決定されるが、そ
のいずれも機械により加工が可能であり高精度にでき
る。さらに長尺仕切板１に設けられた上・下部切込み
６，７と短尺仕切板２に設けられた上・下部凸部９，８
がそれぞれ組合わされること、かつ下から順序よく組立
が可能でありすべての溶接が最も作業性の良好な下向溶
接ができることから溶接による歪を最少限にすることが
できる。According to the structure of this embodiment, the distance between the partition plates, that is, the distance 13a between the long partition plate surfaces and the distance 13b between the short partition plate surfaces are determined by the upper and lower cuts 6 provided on the long partition plate 1. It is determined by the distance between the upper and lower cuts 6 and 7 in the adjacent row and the width of the short partition plate 2, all of which can be machined and have high precision. Further, upper and lower cuts 6 and 7 provided on the long partition plate 1 and upper and lower convex portions 9 and 8 provided on the short partition plate 2.
Are combined with each other, and the assembling can be performed in order from the bottom, and since all welding can be performed with downward welding having the best workability, distortion due to welding can be minimized.
【００２３】長尺仕切板と短尺仕切板との取付けは、長
尺仕切板に設けられた切込み部に差し込まれた短尺仕切
板の凸部を栓溶接により行うが、差し込み部分が拘束さ
れていることより溶接による変形が押さえられる。さら
に栓溶接のため溶接の裏側からの空気の供給がしゃ断さ
れ、バックシールをしなくても、高品質の溶接を得るこ
とができる。Attachment of the long partition plate and the short partition plate is performed by plug welding of a convex portion of the short partition plate inserted into a cut portion provided on the long partition plate, but the inserted portion is restricted. As a result, deformation due to welding is suppressed. Further, the supply of air from the back side of the welding is cut off by plug welding, so that high-quality welding can be obtained without back sealing.
【００２４】また、構成部材がすべて板材であり製作時
の部品類の保管・組立スペースが少なくて作業ができ
る。Further, since all the constituent members are plate members, the space for storing and assembling parts at the time of manufacture is small, and work can be performed.
【００２５】本実施例の使用済燃料貯蔵ラックは、図５
に示すように自動溶接による製作が可能となる。FIG. 5 shows a spent fuel storage rack of this embodiment.
As shown in (1), production by automatic welding becomes possible.
【００２６】本実施例の使用済燃料貯蔵ラックは、構造
が、長尺仕切板１に設けられた切込み部６，７に差し込
まれた短尺仕切板２の凸部８，９を溶着金属１０，１
１，１２にて一体化しており差し込み部が拘束されてい
ることから耐震性に優れている。従って、従来の使用済
燃料貯蔵ラックが備えているような特別に耐震用のバン
ド及びサポート等の設置が不要となる。このことにより
使用済燃料貯蔵ラック自体の外形寸法が小さくでき、燃
料貯蔵プール全体スペースにおいて使用済燃料の貯蔵密
度を高めることができる。The spent fuel storage rack of this embodiment has a structure in which the projections 8 and 9 of the short partition plate 2 inserted into the cut portions 6 and 7 provided in the long partition plate 1 are welded to the metal 10, respectively. 1
It is excellent in earthquake resistance because it is integrated at 1 and 12 and the insertion part is restricted. Therefore, there is no need to install special seismic bands and supports, which are provided in the conventional spent fuel storage rack. As a result, the outer dimensions of the spent fuel storage rack itself can be reduced, and the storage density of the spent fuel can be increased in the entire space of the fuel storage pool.
【００２７】さらに、仕切板を格子状に組立てられてお
り仕切板間には隙間がないことから貯蔵燃料間が完全に
仕切られている状態となっている。これによりそれぞれ
の燃料間の放射能しゃへい効果が優れている。Further, the partition plates are assembled in a lattice shape, and there is no gap between the partition plates, so that the storage fuel is completely partitioned. Thereby, the radiation shielding effect between the respective fuels is excellent.
【００２８】使用済燃料貯蔵ラックは、原子炉建屋内に
設けられた冷却水が充満されている燃料貯蔵プール（図
示せず）内に据付けられ、隣合う長尺仕切り板１及び隣
合う短尺仕切り板２によって仕切られた空間内に使用済
燃料集合体を挿入し貯蔵している。隣接する使用済燃料
集合体相互間には、長尺仕切り板１及び短尺仕切り板２
（中性子しゃへい壁）、及び減速材である冷却水が存在
しているので、使用済燃料集合体の再臨界を防止でき
る。また、使用済燃料集合体相互間の距離を可能な限り
小さくしかつラック全体の外形寸法を小さくしスペース
効率を上げることにより燃料貯蔵プール内での燃料貯蔵
効率を上げることができる。更に、耐震用のバンドおよ
びサポート等の設置が不要となるので、使用済燃料貯蔵
ラックの重量を低減でき、原子炉建屋に対する荷重が低
減される。The spent fuel storage rack is installed in a fuel storage pool (not shown) provided in the reactor building and filled with cooling water, and an adjacent long partition plate 1 and an adjacent short partition are provided. Spent fuel assemblies are inserted and stored in the space partitioned by the plate 2. A long partition plate 1 and a short partition plate 2 are provided between adjacent spent fuel assemblies.
Since the (neutron shielding wall) and the cooling water as a moderator are present, re-criticality of the spent fuel assembly can be prevented. Further, the fuel storage efficiency in the fuel storage pool can be increased by minimizing the distance between the spent fuel assemblies and reducing the outer dimensions of the entire rack to increase the space efficiency. Further, since it is not necessary to install a seismic band and a support, the weight of the spent fuel storage rack can be reduced, and the load on the reactor building can be reduced.
【００２９】以上の如く、本実施例によれば、全体の貯
蔵密度をあげたうえ安価に高精度でかつ信頼性の高い使
用済燃料貯蔵ラックの製作ができる。更に、次のような
効果を達成できる。 （１）長尺仕切板１に設けられた上・下部切込み６，７
と短尺仕切板２に設けられた上・下部凸部９，８がそれ
ぞれ組合わされて組立てられるため仕切板間の寸法精度
が良く、さらに溶接による短尺仕切板２の歪の発生をお
さえることができる。 （２）組立溶接は下向き溶接が可能であり自動溶接化の
適用ができ高品質の製品が少ない工数で得られる。 （３）枠板を使用するため、製作時の部品類の保管・組
立スペースが少なくてよい。 （４）溶接一体構造であるため耐震性に優れている事か
ら耐震用バンドが不要となり、外形寸法を小さくするこ
とができ全体の貯蔵密度をあげることができる。 （５）燃料自体は個々に仕切板にて仕切られており、隣
接の燃料との間には隙間がなく放射能しゃへい効果が優
れている。 （６）特殊な製法となる角筒体の製作が不要となり単純
な板材の組立構造であり製作工数が少なくて製造でき
る。 （７）仕切板を等間隔に２枚平行に取りつけ２重構造と
し、その隙間に冷却水を保有することにより優れた放射
能しゃへい効果を得ることができる。As described above, according to this embodiment, a high-precision and highly reliable spent fuel storage rack can be manufactured inexpensively while increasing the overall storage density. Further, the following effects can be achieved. (1) Upper and lower cuts 6 and 7 provided in long partition plate 1
Since the upper and lower projections 9 and 8 provided on the short partition plate 2 are combined with each other and assembled, the dimensional accuracy between the partition plates is good, and the occurrence of distortion of the short partition plate 2 due to welding can be suppressed. . (2) Assembling welding can be performed by downward welding, automatic welding can be applied, and high-quality products can be obtained with a small number of steps. (3) Since a frame plate is used, a space for storing and assembling parts at the time of manufacturing may be small. (4) Since it is a single-piece welded structure, it has excellent seismic resistance, so that no seismic band is required, the external dimensions can be reduced, and the overall storage density can be increased. (5) The fuel itself is separated by a partition plate, and there is no gap between the fuel and the adjacent fuel, so that the radiation shielding effect is excellent. (6) It is not necessary to manufacture a rectangular cylindrical body, which is a special manufacturing method, and it is a simple plate material assembly structure, and can be manufactured with a small number of manufacturing steps. (7) An excellent radiation shielding effect can be obtained by installing two partition plates in parallel at equal intervals to form a double structure and holding cooling water in the gaps.
【００３０】本発明の他の実施例を図１１により説明す
る。本実施例は、長尺仕切板１及び短尺仕切板２，２′
をそれぞれ２枚隙間を設けて配置した構造としている。
長尺仕切板１間の冷却水保有空間２９および短尺仕切板
間の冷却水保有空間３０に冷却水を保有することにより
貯蔵された使用済燃料間の放射能しゃヘい効果をさらに
優れたものにすることができる。この２枚構造の仕切板
の組立ても前記と同様に下部切り込み６，上部切り込み
７および下部凸部８，上部凸部９を組合わせた上で製造
する。Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the long partition plate 1 and the short partition plates 2, 2 '
Are arranged with two gaps between them.
The cooling water holding space 29 between the long partition plates 1 and the cooling water holding space 30 between the short partition plates 1 further retain the cooling water, thereby further improving the radiation shielding effect between the stored spent fuels. Can be Even in the case of assembling the partition plate having the two-sheet structure, the lower cut 6, the upper cut 7, the lower convex portion 8, and the upper convex portion 9 are assembled in the same manner as described above.
【００３１】[0031]
【発明の効果】第１発明及び第２発明によれば、溶接に
よる変形を少なくでき、かつ燃料プール内での使用済燃
料集合体の貯蔵密度を増加できる。According to the first and second aspects of the invention, deformation due to welding can be reduced, and the storage density of spent fuel assemblies in the fuel pool can be increased.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の好適な一実施例である使用済燃料貯蔵
ラックの全体構成の斜視図である。FIG. 1 is a perspective view of the entire configuration of a spent fuel storage rack according to a preferred embodiment of the present invention.
【図２】図１に示す長尺仕切板の構成図である。FIG. 2 is a configuration diagram of a long partition plate shown in FIG.
【図３】図１に示す短尺仕切板の斜視図である。FIG. 3 is a perspective view of the short partition shown in FIG.
【図４】図１に示す仕切板の組立手順状態を示す説明図
である。FIG. 4 is an explanatory view showing an assembly procedure state of the partition plate shown in FIG. 1;
【図５】図１に示す使用済燃料貯蔵ラックの組立作業状
態の例を示す説明図である。FIG. 5 is an explanatory view showing an example of an assembly operation state of the spent fuel storage rack shown in FIG. 1;
【図６】従来の使用済燃料貯蔵ラックの部分平断面図で
ある。FIG. 6 is a partial plan sectional view of a conventional spent fuel storage rack.
【図７】従来の他の使用済燃料貯蔵ラックの部分平断面
図である。FIG. 7 is a partial plan sectional view of another conventional spent fuel storage rack.
【図８】従来の他の使用済燃料貯蔵ラックの部分平断面
図である。FIG. 8 is a partial plan sectional view of another conventional spent fuel storage rack.
【図９】従来の使用済燃料貯蔵ラックの実施例の全体斜
視図である。FIG. 9 is an overall perspective view of a conventional spent fuel storage rack according to an embodiment.
【図１０】従来の使用済燃料貯蔵ラックの実施例の全体
斜視図である。FIG. 10 is an overall perspective view of an embodiment of a conventional spent fuel storage rack.
【図１１】本発明における仕切板を２重構造とした他の
実施例である使用済燃料貯蔵ラックの斜視図である。FIG. 11 is a perspective view of a spent fuel storage rack according to another embodiment of the present invention in which the partition plate has a double structure.
【符号の説明】 １…長尺仕切板、２…短尺仕切板、２′…２重構造とし
た短尺仕切板、３…側部仕切板、４…底板、５…ラック
の支持脚、６…下部切込み、７…上部切込み、８…下部
凸部、９…上部凸部、１０…下部溶着金属、１１…下部
溶着金属、１２…上部溶着金属、１３ａ…長尺仕切板面
間距離、１３ｂ…短尺仕切板面間距離、１４…自動溶接
ロボット、１５…昇降装置、２１…角筒体、２１ａ…角
筒体の内壁面間距離、２１ｂ…角筒体の外壁面間距離、
２２…接合部材、２３…角パイプ、２４…スペーサ、２
５…耐震用補強部材、２６…ラックの支持脚、２７…補
強部材、２８…ラックの支持脚、２９…長尺仕切板間の
冷却水保有空間、３０…短尺仕切板間の冷却水保有空
間、３１…平板状横板、３２…帯状縦板、３３…帯状縦
板に形成された突起、３４…平板状横板に形成された
溝、３５…隅肉溶接部。[Description of Signs] 1 ... Long partition plate, 2 ... Short partition plate, 2 '... Short partition plate with double structure, 3 ... Side partition plate, 4 ... Bottom plate, 5 ... Rack support leg, 6 ... Lower notch, 7 ... upper notch, 8 ... lower protrusion, 9 ... upper protrusion, 10 ... lower welded metal, 11 ... lower welded metal, 12 ... upper welded metal, 13 a ... distance between long partition plates, 13 b ... Distance between short partition plates, 14: Automatic welding robot, 15: Lifting device, 21: Square cylinder, 21a: Distance between inner wall surfaces of square cylinder, 21b: Distance between outer walls of square cylinder,
22 joining member, 23 square pipe, 24 spacer, 2
5: Reinforcement member for earthquake resistance, 26: Support leg of rack, 27: Reinforcement member, 28: Support leg of rack, 29: Cooling water holding space between long partition plates, 30: Cooling water holding space between short partition plates Reference numeral 31 denotes a flat horizontal plate, 32 denotes a vertical band plate, 33 denotes a projection formed on the vertical vertical plate, 34 denotes a groove formed on the horizontal horizontal plate, and 35 denotes a fillet weld.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 玉井 康方 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 恩田 直人 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 小林 正宏 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 高山 建夫 茨城県日立市幸町三丁目２番２号 日立ニ ュークリアエンジニアリング株式会社内 (72)発明者 矢田 良夫 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yasukata Tamai 3-1-1, Sachimachi, Hitachi-City, Ibaraki Prefecture Inside the Hitachi Works, Hitachi, Ltd. (72) Inventor Naoto Onda 3-Chome, Sachimachi, Hitachi-City, Ibaraki Prefecture No. 1-1 Inside Hitachi, Ltd.Hitachi Plant (72) Inventor Masahiro Kobayashi 3-1-1 Kochicho, Hitachi City, Ibaraki Prefecture Inside Hitachi, Ltd.Hitachi Plant (72) Inventor Tateo Takayama Hitachi City, Ibaraki Prefecture 3-2-2, Sachimachi Hitachi New Clear Engineering Co., Ltd. (72) Inventor Yoshio Yada 3-1-1, Sachimachi, Hitachi, Ibaraki Pref. Hitachi, Ltd. Hitachi, Ltd.
Claims (4)
料貯蔵ラックにおいて、長尺仕切板に複数の切込みを設
け、この切込みに挿入できる凸部を設けた短尺仕切板と
前記長尺仕切板とを格子状に組合わせ、その交点を一体
化したことを特徴とする使用済燃料貯蔵ラック。1. A spent fuel storage rack in which a plurality of cuts are provided in a long partition plate, and a plurality of cuts are provided in the long partition plate, and the long partition plate is provided with a convex portion capable of being inserted into the cut. A spent fuel storage rack, wherein a partition plate and a partition plate are combined in a grid pattern and their intersections are integrated.
料貯蔵ラックの製造方法において、長尺仕切板を水平に
置き、この長尺仕切板に切込み部を設け、この切込み部
に短尺仕切板の凸部に挿入して該短尺仕切板を複数個垂
直に取付け、その交点を下向きに溶接すると共に、前記
複数個の短尺仕切板の他方の凸部に、別の長尺仕切板の
切込み部を組合わせ、この切込み部を下向きに栓溶接
し、この栓溶接手順を繰り返すことを特徴とする使用済
燃料貯蔵ラックの製造方法。2. A method for manufacturing a spent fuel storage rack comprising a combination of partition plates in a grid pattern, wherein a long partition plate is placed horizontally, a cut portion is provided in the long partition plate, and a short portion is provided in the cut portion. A plurality of the short partition plates are vertically inserted by inserting into the projections of the partition plate, and their intersections are welded downward, and another long partition plate is attached to the other projection of the plurality of short partition plates. A method for manufacturing a spent fuel storage rack, comprising combining notches, plug-welding the notches downward, and repeating the plug welding procedure.
製造方法において、前記仕切板の切込み部と凸部を挿入
した後、溶接にて固定し、前記使用済燃料貯蔵ラックに
設けられた耐震用部材を削除し、かつ、その４方向を仕
切板にて隙間なく囲むことを特徴とする使用済燃料貯蔵
ラックの製造方法。3. The method for manufacturing a spent fuel storage rack according to claim 2, wherein the notched portion and the projected portion of the partition plate are inserted and then fixed by welding to be provided on the spent fuel storage rack. A method for manufacturing a spent fuel storage rack, characterized in that the seismic member is removed and the four directions are surrounded by partition plates without gaps.
製造方法において、前記長尺仕切板および短尺仕切板を
それぞれ等間隔の隙間を有した状態に２枚平行に並べ、
前記切込みおよび凸部を有した仕切板を組立て、その隙
間に冷却水を保有することを特徴とする使用済燃料貯蔵
ラックの製造方法。4. The method for manufacturing a spent fuel storage rack according to claim 2, wherein the long partition plate and the short partition plate are arranged in parallel with each other with a space between them at equal intervals.
A method for manufacturing a spent fuel storage rack, comprising: assembling a partition plate having the cuts and convex portions; and holding cooling water in a gap therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33237599A JP3145085B2 (en) | 1999-11-24 | 1999-11-24 | Spent fuel storage rack and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33237599A JP3145085B2 (en) | 1999-11-24 | 1999-11-24 | Spent fuel storage rack and manufacturing method thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3241693A Division JP3020675B2 (en) | 1991-09-20 | 1991-09-20 | Spent fuel storage rack and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000121782A true JP2000121782A (en) | 2000-04-28 |
| JP3145085B2 JP3145085B2 (en) | 2001-03-12 |
Family
ID=18254273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33237599A Expired - Lifetime JP3145085B2 (en) | 1999-11-24 | 1999-11-24 | Spent fuel storage rack and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3145085B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010014681A (en) * | 2008-07-07 | 2010-01-21 | Toshiba Corp | Spent fuel storage rack and manufacturing method therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200488199Y1 (en) * | 2015-11-23 | 2018-12-26 | 씨제이제일제당 주식회사 | a container for packing kimchi |
-
1999
- 1999-11-24 JP JP33237599A patent/JP3145085B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010014681A (en) * | 2008-07-07 | 2010-01-21 | Toshiba Corp | Spent fuel storage rack and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3145085B2 (en) | 2001-03-12 |
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