JPS5961798A - Nozzle with skirt of fuel assembly - Google Patents
Nozzle with skirt of fuel assemblyInfo
- Publication number
- JPS5961798A JPS5961798A JP57172238A JP17223882A JPS5961798A JP S5961798 A JPS5961798 A JP S5961798A JP 57172238 A JP57172238 A JP 57172238A JP 17223882 A JP17223882 A JP 17223882A JP S5961798 A JPS5961798 A JP S5961798A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- fuel assembly
- support
- skirt
- fuel
- 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
- Closures For Containers (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
この発明は原子炉用燃料集合体のスカート付きノズルに
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a skirted nozzle for a fuel assembly for a nuclear reactor.
原子炉内の所定位置に装荷され一定期間燃焼した燃料集
合体は、炉心から取り出して新しい燃料集合体と交換す
るか、あるいは炉心内で位置換えされる。炉心内の隣接
する燃料集合体間の間隔は僅か約１間であり狭いので、
前記交換または位ＩＮ換え作業中に燃料集合体の支持格
子同士または支持格子と上部ノズルまたは下部ノズルが
互いに接触干渉し合って支持格子が損傷することがある
。A fuel assembly loaded in a predetermined position in a nuclear reactor and burned for a certain period of time is removed from the core and replaced with a new fuel assembly, or is relocated within the reactor core. Since the spacing between adjacent fuel assemblies in the core is narrow, only about 1 inch,
During the replacement or repositioning work, the support grids of the fuel assembly or the support grids and the upper nozzle or lower nozzle may come into contact with each other and cause damage to the support grids.
前記燃料集合体は、第１図に示すように、上下に離間し
て配設された上部ノズル１及び下部ノズル２と、これら
の間に所定の間隔をおいて配置され、ストラップにより
形成された格子空間を有する複数の支持格子３と、これ
ら支持格子３の格子空間内に所定の間隔をおいて挿通さ
れ、かつ、支持格子３の固定部に固定され、さらにそれ
ぞれの上下端部を上部ノズル１、下部ノズル２に連結さ
れた制御棒案内管４と、被覆管内に密封された多数の燃
料ベレット及びこれらの押えばねを有し、支持格子３の
格子空間の所定箇所に挿通され、支持格子３の剛性支持
部及び弾性支持部により支持された多数の燃料棒５とか
ら構成されたものである０
このように構成された燃料集合体を原子炉に装荷する際
若しくは原子炉から取り出す際には、上昇または下降し
つつある第２図に示す燃料集合体Ａと、この燃料集合体
Ａに対し隣接位置にあって停止しているか、あるいは燃
料集合体Ａに対し第３図に示すように対角位置にあって
停止している燃料集合体Ｂとのそれぞれの支持格子３．
３が干渉し、このため、支持格子３．３の局部に大きな
荷重がかかり、これら支持格子３．３が損傷する場合が
ある。なお、第２図中６は燃料集合***置決めピン、７
は下部炉心板である。As shown in FIG. 1, the fuel assembly includes an upper nozzle 1 and a lower nozzle 2 which are vertically spaced apart, and which are arranged with a predetermined interval between them and formed by a strap. A plurality of support grids 3 having grid spaces are inserted into the grid spaces of these support grids 3 at predetermined intervals, and are fixed to the fixed parts of the support grids 3, and the upper and lower ends of each are connected to the upper nozzle. 1. It has a control rod guide tube 4 connected to the lower nozzle 2, a large number of fuel pellets sealed in a cladding tube, and their pressing springs, and is inserted into a predetermined place in the lattice space of the support lattice 3, and is inserted into the lattice space of the support lattice 3. It is composed of a large number of fuel rods 5 supported by the rigid support part 3 and the elastic support part 0. When loading the fuel assembly thus constructed into the reactor or taking it out from the reactor, The fuel assembly A shown in FIG. 2 is rising or falling, and the fuel assembly A is located at a position adjacent to this fuel assembly A and is stopped, or the fuel assembly A shown in FIG. Respective support grids 3. with fuel assemblies B stationary in diagonal positions;
3 interfere with each other, and as a result, large loads are applied to local areas of the support grids 3.3, which may be damaged. In addition, in Fig. 2, 6 is a fuel assembly positioning pin, and 7 is a fuel assembly positioning pin.
is the lower core plate.
ところで、従来の支持格子３の損傷例を調査した結果、
最上段の支持格子３の上端および最下段の支持格子３の
下端が損傷している燃料集合体は、調査燃料集合体全数
の約半数を占め、他の部分が損傷している燃料集合体に
比して圧倒的に多いことが判明した。これは、第２図か
らみて明らかなように原子炉への燃料集合体装荷時、既
に装荷済みの燃料集合体Ｂの最上段支持格子３の上端と
、その隣接若しくは対角位置に装荷中の燃料集合体Ａの
最下段の支持格子３の下端とが干渉し、前記燃料集合体
Ｂの最上段の支持格子３の上端及び前記燃料集合体Ａの
最下段の支持格子３の下端が損傷し易いことに基因する
ものである。By the way, as a result of investigating damage cases of the conventional support grid 3,
Fuel assemblies in which the upper end of the uppermost supporting grid 3 and the lower end of the lowermost supporting grid 3 were damaged accounted for approximately half of the total number of investigated fuel assemblies; It turned out that the number was overwhelmingly higher. As is clear from Fig. 2, when fuel assemblies are loaded into the reactor, the upper end of the uppermost support grid 3 of the already loaded fuel assembly B and the adjacent or diagonal position of the loaded fuel assembly are The lower end of the lowermost support grid 3 of the fuel assembly A interferes with the lower end of the support grid 3 of the lowermost stage, and the upper end of the uppermost support grid 3 of the fuel assembly B and the lower end of the lowermost support grid 3 of the fuel assembly A are damaged. This is due to the fact that it is easy to use.
このように、支持格子３に損傷が認められた燃料集合体
は、本来の寿命を全うしていないのにもかかわらず、再
使用することが認められず甚だ不経済であった。In this way, the fuel assembly in which the support grid 3 was found to be damaged could not be reused even though it had not completed its original lifespan, which was extremely wasteful.
この発明は、前記事情に鑑みてなされたもので、上部ノ
ズルの下面及び下部ノズルの上面にスカートを装着して
、これら上部ノズル、下部ノズルと支持格子との間の間
隙を概ね囲繞することにより、隣接若しくは対角位置に
ある燃料集合体の各支持格子同士のまたは支持格子と上
部ノズルまたは下部ノズルとの干渉を防止することがで
き、これにより支持格子の損傷を防止することができる
燃ｒト集合体のスカート付きノズルを提供することを目
的とする。This invention has been made in view of the above circumstances, and is achieved by attaching a skirt to the lower surface of the upper nozzle and the upper surface of the lower nozzle, and generally surrounding the gap between the upper nozzle, the lower nozzle, and the support grid. It is possible to prevent interference between support grids of adjacent or diagonally located fuel assemblies or between the support grid and the upper nozzle or the lower nozzle, thereby preventing damage to the support grid. It is an object of the present invention to provide a skirted nozzle for an aggregate.
以下、この発明の一実施例を第４図及び第６図に基づい
て説明する。なお、この実１ｍ例において律来例と同一
部分には同一符号を付してその説明を省略する。第４図
中１１はスデンレス洒敬からなるスカートであり、この
スカート１１は第５図に示すように中空四角錐台部１２
の下部が折曲状態とされてこの中空四角錐台部１２に連
続して四角筒状部１３が形成され、かつ中空四角錐台部
１２の上部に僕数の三角ノ１ツの縁部１４が横に並設さ
れて上縁とされてなる枠１５内に格子状のリプ１６が設
けられたものである。An embodiment of the present invention will be described below with reference to FIGS. 4 and 6. In this actual 1m example, the same parts as those in the conventional example are given the same reference numerals, and their explanation will be omitted. Reference numeral 11 in FIG. 4 is a skirt made of Sudenres Jakkei, and as shown in FIG.
The lower part of the hollow square truncated pyramid part 12 is bent to form a square cylindrical part 13 continuously, and the upper part of the hollow square truncated pyramid part 12 has a triangular edge 14. A lattice-like lip 16 is provided within a frame 15 formed by horizontally disposed side-by-side lines serving as an upper edge.
スカート１１の中空四角錐台部１２の囲壁には、その上
縁に沿って延びるコルゲーション（波Ｊｌｌ ）１７と
その下方に位１行シ、かつ中空四角錐台部１２の周方向
に向けて第５図に示すように並ぶハの字形のコルゲーシ
ョン１８が形成されている。The surrounding wall of the hollow quadrangular truncated pyramid part 12 of the skirt 11 has a corrugation (wave Jll) 17 extending along its upper edge, one row of corrugations below the corrugation, and a corrugation extending in the circumferential direction of the hollow quadrangular truncated pyramid part 12. As shown in FIG. 5, V-shaped corrugations 18 are formed.
このコルゲーション１７は、前記囲壁の内面側に突出し
外面側では四まされて形成されている。これらコルゲー
ション１８の中間に位置する長孔１９は新訂抜加工によ
り形成されて必る。長孔１９の縁部は、第６ＦｉＪに示
すように中空四角錐台部１２の内面側に打抜加工され、
外面側には突出していない。コルゲーション１７．１８
は、中空四角錐台部１２の囲壁の補強のために、長孔１
９は冷却水を効率よく通水させるため又、定検時の燃料
棒の長さ等を観察するためにそれぞれ形成されたもので
ある。This corrugation 17 is formed so as to protrude toward the inner surface of the surrounding wall and to be squared on the outer surface. The long hole 19 located between these corrugations 18 must be formed by a new punching process. The edge of the elongated hole 19 is punched into the inner surface of the hollow quadrangular truncated pyramid part 12, as shown in No. 6 FiJ,
It does not protrude outward. Corrugation 17.18
In order to reinforce the surrounding wall of the hollow quadrangular truncated pyramid part 12, the elongated hole 1 is
Reference numeral 9 is formed for efficiently passing cooling water and for observing the length of fuel rods during regular inspections.
一方、下部ノズル２の上部外周、上部ノズル１の下部外
周にはそれぞれ段部２ａｓｌａが形成されている。On the other hand, a stepped portion 2asla is formed on the upper outer periphery of the lower nozzle 2 and the lower outer periphery of the upper nozzle 1, respectively.
スカート１１は、その四角筒状部１３の下端部を下部ノ
ズル２０段部２ａに嵌合され、かつ三角形の縁部１４の
頂部が各燃料棒５間の中央に位置させられた状態で、即
ち各三角形の縁部１４間に燃料棒５を位置させて、四角
筒状部１３の下端部を下部ノズル２に点溶接、Ｔ工Ｇ溶
接またはねじ止めにより取り付けられている。そして、
このスカート１１により、下部ノズル２と、この下部ノ
ズル２から最も近い支持格子３との間の間隙が概ね囲繞
されている。四角筒状部１３の外壁面と下部ノズル２の
外壁面とは面一とされている。The skirt 11 is in a state in which the lower end of the square cylindrical part 13 is fitted into the step part 2a of the lower nozzle 20, and the top of the triangular edge 14 is located in the center between the fuel rods 5, i.e. The fuel rod 5 is positioned between the edges 14 of each triangle, and the lower end of the square cylindrical part 13 is attached to the lower nozzle 2 by spot welding, T-weld, or screwing. and,
This skirt 11 generally surrounds the gap between the lower nozzle 2 and the support grid 3 closest to it. The outer wall surface of the square cylindrical portion 13 and the outer wall surface of the lower nozzle 2 are flush with each other.
スカート１１の第４図に示す中空四角錐台部１２の亮さ
Ｈは、下部ノズル２とこの下部ノズル２に最も近い支持
格子（下部支持格子）３との間の幅３ｂより小さい寸法
ときれている。The brightness H of the hollow quadrangular truncated pyramid part 12 shown in FIG. ing.
また、スカート１１はその四角筒状部１３の端部な上部
ノズル１の段部１＆に嵌合されて、下部ノズル２への取
り付けと同様に上部ノズル１に取り付けられている。Further, the skirt 11 is attached to the upper nozzle 1 in the same manner as to the lower nozzle 2 by fitting into the stepped portion 1 & of the upper nozzle 1 which is the end of the square cylindrical portion 13.
しかして、前記のように構成されたスカート１１がそれ
ぞれ取り付けられた下部ノズル２、上部ノズル１を有す
る燃料集合体Ａを炉心に装荷する際または炉心から取り
出す際には、上部ノズル１のスカート１１とこの上部ノ
ズル１に最も近い支持格子（上部支持格子）３との間の
間隔が、他の各支持格子３の幅３ｂより小さく、また下
部ノズル２のスカート１１とこの下部ノズル２に最も上
部ノズル１と上部支持格子８との間及び下部ノズル２と
下部支持格子３との間には＼他の支持格子３は寸法的に
入り込めない。また、スカートエ１は、その支持格子３
側が内側へすぼまっているので、このスカー）１１に他
の燃料集合体の支持格子３等が万一当接しても、これら
を滑動させてはじき出す。従って、この実施例によれば
、隣接状態若しくは対角位置状態にある燃料集合体の支
持格子３同士または支持格子３と上部ノズル１または下
部ノズルとの干渉を回避することができ、これにより支
持格子３の損傷を防止することができる。Therefore, when loading the fuel assembly A, which has the lower nozzle 2 and the upper nozzle 1 to which the skirt 11 configured as described above is attached, into the core or taking it out from the core, the skirt 11 of the upper nozzle 1 The distance between the support grid (upper support grid) 3 closest to this upper nozzle 1 is smaller than the width 3b of each other support grid 3, and the distance between the skirt 11 of the lower nozzle 2 and the support grid 3 closest to this lower nozzle 2 is Dimensionally, no other support grid 3 can fit between the nozzle 1 and the upper support grid 8 and between the lower nozzle 2 and the lower support grid 3. In addition, the skirt 1 has its support grid 3
Since the sides are tapered inward, even if the support grids 3, etc. of other fuel assemblies come into contact with this scar 11, they will slide and be thrown out. Therefore, according to this embodiment, it is possible to avoid interference between the support grids 3 of fuel assemblies that are adjacent to each other or in diagonal positions, or between the support grids 3 and the upper nozzle 1 or the lower nozzle. Damage to the grid 3 can be prevented.
以上説明したようにこの発明によれば、下部ノズルの上
部及び上部ノズルの下部に、これら下部ノズル、上部ノ
ズルとこれら下部ノズル上部ノズルから最も近い支持格
子との間の間隙を概ね囲繞するスカートを取り付けた構
成であるから、燃料集合体を炉心に装荷する際または炉
心から取り出す際には、上部ノズルと上部支持格子との
間及び下部ノズルと下部支持格子との間に他の支持格子
が寸法的に入り込めず、またスカートはその支持格子側
が内側へすぼまっているので、スカートに当接した上部
ノズル、下部ノズル、支持格子を滑動させてはじき出す
ので、隣接状態若しくは対角位置状態にある燃料集合体
の支持格子同士または支持格子と上部ノズルまたは下部
ノズルとの干渉を防止することができ、これにより支持
格子の損傷を防止することができ、経済的である。As explained above, according to the present invention, the upper part of the lower nozzle and the lower part of the upper nozzle are provided with a skirt that generally surrounds the gap between the lower nozzle, the upper nozzle, and the support grid closest to the lower nozzle and the upper nozzle. Because of the attached configuration, when loading or removing fuel assemblies from the core, other support grids must be spaced between the upper nozzle and the upper support grid and between the lower nozzle and the lower support grid. Also, since the support grid side of the skirt is constricted inward, the upper nozzle, lower nozzle, and support grid that are in contact with the skirt slide and are ejected, resulting in an adjacent state or diagonal position state. It is possible to prevent interference between the support grids of a certain fuel assembly or between the support grids and the upper nozzle or the lower nozzle, thereby preventing damage to the support grids, which is economical.
第１図は従来の燃料集合体の正面図、第２図はその相隣
り合う燃料集合体の支持格子の干渉状態を示す正面図、
第３図はその要部の平面図、第４図はこの発明の一実施
例を示す正面図、第５図はそのスカートの斜視図、第６
図は第゛４図の■内部の拡大詳細図である。
１・・・・・上部ノズル、２・・・・・下部ノズル、３
・・・・・支持格子、４・・・・・制御棒案内管、５・
・・・・燃料棒、１１・・・・・スカート、１２′・・
・・・中空−角錐台部、１３・・・・・四角筒状部、１
４・・・・・縁部、１６・・・・・リブ、１７・・・・
・コルゲージ目ン（波形）、１８・・・・・・コルゲー
ション、１９・・・・・長孔。FIG. 1 is a front view of a conventional fuel assembly, and FIG. 2 is a front view showing the state of interference between support grids of adjacent fuel assemblies.
FIG. 3 is a plan view of the main part, FIG. 4 is a front view showing an embodiment of the invention, FIG. 5 is a perspective view of the skirt, and FIG.
The figure is an enlarged detailed view of the inside part (■) in FIG. 4. 1...Top nozzle, 2...Bottom nozzle, 3
...Support grid, 4...Control rod guide tube, 5.
...Fuel rod, 11...Skirt, 12'...
... Hollow - truncated pyramid part, 13 ... Square cylindrical part, 1
4... Edge, 16... Rib, 17...
・Corrugage eye (waveform), 18... Corrugation, 19... Long hole.
Claims (1)
御棒案内管及び燃料棒を挿通し、前記制御棒案内管の両
端に、それぞれ前記燃料棒の端部から離間して下部ノズ
ル、上部ノズルを取り付けた燃料集合体において、前記
下部ノズルの上部及び前記上部ノズルの下部に、これら
下部ノズル、上部ノズルとこれら下部ノズル、上部ノズ
ルから最も近い支持格子との間の間隙を概ね囲繞するス
カートを取り利けてなることを特徴とする燃料集合体の
スカート付きノズル。A control rod guide tube and a fuel rod are inserted into the lattice spaces of a plurality of support lattices arranged to face each other at a distance, and lower nozzles are provided at both ends of the control rod guide tube, spaced apart from the ends of the fuel rods, respectively; In a fuel assembly equipped with upper nozzles, the upper nozzle and the lower part of the upper nozzle are provided with a fuel assembly that generally surrounds the gap between the lower nozzle, the upper nozzle and the support grid closest to the lower nozzle and the upper nozzle. A skirted nozzle for a fuel assembly characterized by a removable skirt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57172238A JPS5961798A (en) | 1982-09-30 | 1982-09-30 | Nozzle with skirt of fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57172238A JPS5961798A (en) | 1982-09-30 | 1982-09-30 | Nozzle with skirt of fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5961798A true JPS5961798A (en) | 1984-04-09 |
| JPS6346386B2 JPS6346386B2 (en) | 1988-09-14 |
Family
ID=15938174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57172238A Granted JPS5961798A (en) | 1982-09-30 | 1982-09-30 | Nozzle with skirt of fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5961798A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2932600A1 (en) * | 2008-06-11 | 2009-12-18 | Areva Np | LOWER NUCLEAR FUEL ASSEMBLY TIP |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3827125B1 (en) | 2018-07-25 | 2022-04-27 | Compagnie Generale Des Etablissements Michelin | Highly compressible open cord |
| CA3104564C (en) | 2018-07-25 | 2024-04-16 | Compagnie Generale Des Etablissements Michelin | Bi-modulus metal cords |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221189A (en) * | 1982-06-17 | 1983-12-22 | 三菱原子力工業株式会社 | Nuclear fuel assembly |
-
1982
- 1982-09-30 JP JP57172238A patent/JPS5961798A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221189A (en) * | 1982-06-17 | 1983-12-22 | 三菱原子力工業株式会社 | Nuclear fuel assembly |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2932600A1 (en) * | 2008-06-11 | 2009-12-18 | Areva Np | LOWER NUCLEAR FUEL ASSEMBLY TIP |
| WO2010001033A3 (en) * | 2008-06-11 | 2010-02-25 | Areva Np | Nuclear fuel assembly bottom nozzle |
| US8712004B2 (en) | 2008-06-11 | 2014-04-29 | Areva Np | Nuclear fuel assembly bottom nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6346386B2 (en) | 1988-09-14 |
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