JPH083553B2 - Assembly method and apparatus for fuel assembly - Google Patents

Assembly method and apparatus for fuel assembly

Info

Publication number
JPH083553B2
JPH083553B2 JP63301964A JP30196488A JPH083553B2 JP H083553 B2 JPH083553 B2 JP H083553B2 JP 63301964 A JP63301964 A JP 63301964A JP 30196488 A JP30196488 A JP 30196488A JP H083553 B2 JPH083553 B2 JP H083553B2
Authority
JP
Japan
Prior art keywords
fuel rod
fuel
cover
plug
rod
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.)
Expired - Lifetime
Application number
JP63301964A
Other languages
Japanese (ja)
Other versions
JPH02147897A (en
Inventor
修二 山崎
潤一 大山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Nuclear Fuel Co Ltd
Original Assignee
Mitsubishi Nuclear Fuel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Nuclear Fuel Co Ltd filed Critical Mitsubishi Nuclear Fuel Co Ltd
Priority to JP63301964A priority Critical patent/JPH083553B2/en
Publication of JPH02147897A publication Critical patent/JPH02147897A/en
Publication of JPH083553B2 publication Critical patent/JPH083553B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

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  • Automatic Assembly (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、燃料集合体を組み立てる際に生じる燃料棒
外周部のスクラッチを防止するためになされた燃料集合
体の組立方法、およびその方法を実施するための組立装
置に関する。The present invention relates to a method for assembling a fuel assembly, which is made to prevent scratches on the outer peripheral portion of a fuel rod when assembling the fuel assembly, and a method therefor. It relates to an assembling apparatus for carrying out the invention.

「従来の技術」 加圧水型軽水炉等の原子炉において使用される燃料集合
体の一例として、第９図、第10図に示すものが知られて
いる。"Prior Art" As an example of a fuel assembly used in a nuclear reactor such as a pressurized water reactor, those shown in Figs. 9 and 10 are known.

これらの図中符号１および２は上下方向に離間して対
向配置された上部ノズルおよび下部ノズルを示し、これ
ら上部ノズル１と下部ノズル２との間には、複数の制御
棒案内管３が渡されて固定されている。これら制御棒案
内管３の中途部には、複数の支持格子４が上下方向に互
いに離間して取り付けられている。そして、各支持格子
４の格子空間５を形成する壁部には第10図に示すよう
に、燃料棒６を支持するためのデインプル７とスプリン
グ８とが互いに対向して形成されており、これにより、
燃料棒６を四方から押圧支持する各セル９が作られてい
る。In these drawings, reference numerals 1 and 2 denote an upper nozzle and a lower nozzle which are spaced apart from each other in the vertical direction and face each other. A plurality of control rod guide tubes 3 are provided between the upper nozzle 1 and the lower nozzle 2. Has been fixed. A plurality of support grids 4 are attached to the control rod guide tubes 3 in the middle of the control rod guide tubes 3 so as to be vertically spaced apart from each other. As shown in FIG. 10, the dimples 7 and springs 8 for supporting the fuel rods 6 are formed on the wall portion of the support lattice 4 forming the lattice space 5 so as to face each other. Due to
Each cell 9 for pressing and supporting the fuel rod 6 from four sides is formed.

次に、上記構成の燃料集合体の組立方法について説明
する。Next, a method of assembling the fuel assembly having the above configuration will be described.

まず、支持格子４を所定の間隔だけ離間させて配置
し、これら支持格子４の互いに対向する格子空間５の一
部に制御棒案内管３を挿通し、その一端部に燃料棒ガイ
ドプレート（図示せず）を固定する。その後、制御棒案
内管３に支持された支持格子４の各セル９に、燃料棒６
をグリッパにより保持して挿入し、スプリング８により
デインプル７を介して押圧固定する。そして、全ての燃
料棒６を挿入通し終えた後、燃料棒ガイトプレートを取
り外し、上部ノズル１および下部ノズル２を制御棒案内
管３の両端部にそれぞれ固定する。First, the support grids 4 are arranged with a predetermined gap therebetween, the control rod guide tubes 3 are inserted into a part of the grid spaces 5 of the support grids 4 facing each other, and the fuel rod guide plate (Fig. Fix (not shown). After that, the fuel rods 6 are attached to the cells 9 of the support grid 4 supported by the control rod guide tubes 3.
Is held and inserted by the gripper, and is pressed and fixed by the spring 8 via the dimple 7. After all the fuel rods 6 have been inserted and passed, the fuel rod guide plate is removed, and the upper nozzle 1 and the lower nozzle 2 are fixed to both ends of the control rod guide pipe 3, respectively.

「発明が解決しようとする問題点」 ところで、上記燃料集合体の組立方法にあっては、支
持格子４の各セル９に燃料棒６を挿入する際に、燃料棒
６の外周部が、スプリング８とデインプル７の間に挟ま
れるため、燃料棒６の外周部には、これらスプリング８
およびデインブル７により軸線方向に沿うスクラッチが
発生してしまう問題があった。[Problems to be Solved by the Invention] In the method for assembling the fuel assembly, when the fuel rod 6 is inserted into each cell 9 of the support grid 4, the outer peripheral portion of the fuel rod 6 is a spring. 8 and the dimple 7 are sandwiched between the fuel rod 6 and the spring 8
Also, there is a problem that the dimple 7 causes scratches along the axial direction.

また、一方、支持格子４の各セル９に、燃料棒６より
大きい所定径のプラグを挿通させてスプリング８を一旦
押し広げ、スプリング８の押圧力およびセル９の径の調
整を行なった後、セル９内に燃料棒６を挿入させる方法
がある。しかしながら、この方法の場合、燃料棒６を挿
入する前に、各セル９にそれぞれ調整用のプラグを挿通
しなければならず、それらの作業が面倒である欠点があ
った。On the other hand, after inserting a plug having a predetermined diameter larger than the fuel rod 6 into each cell 9 of the support grid 4 to temporarily expand the spring 8 and adjust the pressing force of the spring 8 and the diameter of the cell 9, There is a method of inserting the fuel rod 6 into the cell 9. However, in the case of this method, the plugs for adjustment must be inserted into the cells 9 before the fuel rods 6 are inserted, and there is a drawback that the work is troublesome.

本発明は、上記事情に鑑みてなされたもので、燃料集
合体組立の際に、燃料棒外周部へのスクラッチの発生を
防止すると同時に、スプリングの押圧力を調整すること
ができる燃料集合体の組立方法およびそれを好適に実施
し得る組立装置を提供することを目的とする。The present invention has been made in view of the above circumstances, and at the time of assembling a fuel assembly, it is possible to prevent the occurrence of scratches on the outer peripheral portion of the fuel rod, and at the same time, to adjust the pressing force of the spring. An object of the present invention is to provide an assembling method and an assembling apparatus capable of suitably implementing the assembling method.

「問題点を解決するための手段」 本願発明の方法は、軸線方向に所定間隔をもって配置
された支持格子の、少なくとも１つの燃料棒押圧用弾性
部材を有するセル内に、それぞれ燃料棒を挿入配置して
なる燃料集合体を組み立てるに際し、燃料棒の外周部ほ
ぼ全域を円筒状のカバーで覆うとともに、該カバーの先
端に、前記セルに押し広げるべくその径を前記カバーの
径以上に設定され且つセル径より小さい先端小径部を有
するプラグを取り付け、前記カバーで覆った状態のまま
燃料棒を、前記プラグを移動方向前側として前記セル内
に挿入し、次いで、燃料棒の後端に把持し前記プラグ及
びカバーをさらに前方へ移動させて燃料棒から取り出す
ことを特徴とする。"Means for Solving the Problems" In the method of the present invention, fuel rods are inserted and arranged in cells having at least one elastic member for pushing fuel rods of a support grid arranged at predetermined intervals in the axial direction. When assembling the fuel assembly, the substantially entire outer peripheral portion of the fuel rod is covered with a cylindrical cover, and the diameter of the cover is set to be equal to or larger than the diameter of the cover so as to be spread to the cells. A plug having a tip small diameter portion smaller than the cell diameter is attached, the fuel rod is inserted into the cell while the plug is covered with the cover, and the plug is held at the rear end of the fuel rod. It is characterized in that the plug and the cover are moved further forward and taken out from the fuel rod.

また、本発明の燃料集合体の組立装置は、軸線方向に
所定間隔きに配置した状態で支持格子を支持する組立台
と、該組立台の後方に配置されて、先端にセル押し広げ
用のプラグを有する円筒状のカバーで覆われた多数の燃
料棒を、所定間隔置きに並列に保持するとともに、燃料
棒移動方向に対して垂直な方向に移動自在とされている
燃料棒マガジンと、前記組立台の前方に配され、内蔵さ
れた燃料棒引き込み工具を後方へ移動させて、前記燃料
棒マガジンに収納している前記燃料棒の先端に位置する
前記プラグと係合し、該プラグを前方へ引き込むことに
より、前記燃料棒を組立台で支持した前記支持格子に挿
通させるとともに、燃料棒移動方向に対して垂直な方向
に移動自在とされている燃料棒引き込み機と、前記燃料
棒マガジンに並設され、該燃料棒マガジンが燃料棒移動
方向に対して垂直な方向にずれたとき燃料棒移動方向に
対して垂直な方向に移動して前記組立台の後方に位置
し、燃料棒の後端を把持する燃料棒把持機と、前記燃料
棒引き込み機に並設され、該燃料棒引き込み機が燃料棒
移動方向に対して垂直な方向にずれたとき燃料棒移動方
向に対し垂直な方向に移動して前記組立台の前方に位置
し、前記プラグと係合して該プラグを前記カバーごと前
方へ移動させて燃料棒から取り出すカバー除去機とを備
えてなることを特徴とする。Further, the fuel assembly assembling apparatus according to the present invention includes an assembly table for supporting the support grid in a state of being arranged at a predetermined interval in the axial direction, and an assembly table arranged at the rear of the assembly table for expanding cells at the tip. A plurality of fuel rods covered by a cylindrical cover having a plug are held in parallel at predetermined intervals and are movable in a direction perpendicular to the fuel rod moving direction; The built-in fuel rod retraction tool, which is arranged in front of the assembly table, is moved rearward to engage with the plug located at the tip of the fuel rod housed in the fuel rod magazine, and the plug is moved forward. By pulling the fuel rods into the support grid supported by the assembly table, and the fuel rod retractor movable in the direction perpendicular to the fuel rod moving direction, and the fuel rod magazine. Juxtaposed When the fuel rod magazine is displaced in a direction perpendicular to the fuel rod moving direction, the fuel rod magazine moves in a direction perpendicular to the fuel rod moving direction and is positioned behind the assembly table, and grips the rear end of the fuel rod. And a fuel rod retractor that are parallel to each other. When the fuel rod retractor is displaced in a direction perpendicular to the fuel rod moving direction, it moves in a direction perpendicular to the fuel rod moving direction. And a cover remover that is located in front of the assembly table and that engages with the plug and moves the plug together with the cover forward to take it out from the fuel rod.

「作用」 本発明の燃料集合体の組立方法よれば、燃料棒挿入の
際に、燃料棒の外周を覆うカバーを介して燃料棒の先端
に取り付けられたプラグがセルの燃料棒押圧用弾性部材
に当接してセルを所定量押し広げた後、燃料棒がセル内
に挿入される。この時、燃料棒の外周部はカバーによっ
て覆われているため、燃料棒をセル内に挿入する際に燃
料棒押圧用弾性部材が燃料棒に接触して、燃料棒の表面
に傷がつくことが無い。[Operation] According to the method of assembling the fuel assembly of the present invention, when the fuel rod is inserted, the plug attached to the tip of the fuel rod through the cover covering the outer periphery of the fuel rod is the elastic member for pushing the fuel rod of the cell. The fuel rod is inserted into the cell after abutting against the to spread the cell by a predetermined amount. At this time, since the outer periphery of the fuel rod is covered by the cover, the elastic member for pressing the fuel rod may come into contact with the fuel rod when the fuel rod is inserted into the cell, and the surface of the fuel rod may be damaged. There is no.

さらに、本発明の燃料集合体の組立装置によれば、燃
料棒引き込み機とカバー除去機とが別個に設けられてい
るので、燃料棒引き込み機が燃料棒を支持格子内に引き
込む作業を行っている際に、燃料棒引き込み機の側方で
休止しているカバー除去機からカバーとプラグとを取り
除くことができ、燃料集合体の組立を効率よく行うこと
ができる。Further, according to the fuel assembly assembling apparatus of the present invention, since the fuel rod retractor and the cover remover are separately provided, the fuel rod retractor performs the work of retracting the fuel rod into the support grid. The cover and the plug can be removed from the cover removing machine that is idle at the side of the fuel rod retractor while the fuel rod retractor is in operation, so that the fuel assembly can be efficiently assembled.

また、カバーを燃料棒から取り外す際には、燃料棒把
持機が燃料棒移動方向に対して側方側に移動して燃料棒
マガジンと入れ替わるとともに、カバー除去機が燃料棒
移動方向に対して側方側に移動して燃料棒引き込み機と
入れ替わるので、カバーおよびプラグを燃料棒から取り
外す作業を迅速に行うことができる。When removing the cover from the fuel rod, the fuel rod gripper moves laterally with respect to the fuel rod moving direction to replace the fuel rod magazine, and the cover remover moves sideways with respect to the fuel rod moving direction. Since it moves to the side and replaces the fuel rod retractor, the work of removing the cover and the plug from the fuel rod can be performed quickly.

「実施例」 以下、本発明の一実施例を図面を参照して説明する。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

まず、本発明装置について説明する。第２図は本発明
装置の概略構成を示す側面図、第３図は同平面図であ
る。First, the device of the present invention will be described. FIG. 2 is a side view showing a schematic configuration of the device of the present invention, and FIG. 3 is a plan view of the same.

これらの図において符号10は燃料棒６を縦横に収納す
る燃料棒マガジン、11は各支持格子４を軸線方向に所定
間隔をもって離間させた状態で保持する組立台、12は燃
料棒引き込み機であり、これらは、燃料集合体を組み立
てる際の燃料棒の移動方向（第２図中AB方向）に沿って
同軸上に配されている。In these drawings, reference numeral 10 is a fuel rod magazine for storing the fuel rods 6 vertically and horizontally, 11 is an assembly stand for holding the support grids 4 at a predetermined distance in the axial direction, and 12 is a fuel rod retractor. , And these are arranged coaxially along the moving direction of the fuel rod when assembling the fuel assembly (AB direction in FIG. 2).

前記燃料棒引き込み機12には駆動機構13によって図中
AB方向へ移動する移動台14が配設されている。この移動
台14には複数の燃料棒引き込み工具15が着脱自在に取り
付けられている。燃料棒引き込み工具15は、プルロッド
とインナーロッドとからなり、プルロッドはガイドチュ
ーブの先端にフインガ16がねじ嵌合により連結された構
造となっている（第６図参照）。フインガ16は先端が閉
塞された管状のもので、その先端側は先細りテーパ状と
なっている。また、フインガ16の中央から先端側は円周
方向に複数分割（例えば４分割、６分割）されて板ばね
状となり、その先端には外爪17が形成されている。外爪
17は、プルロッド内の前記インナーロッドが先方へ移動
する際にフインガ内周部のテーパー面が押されて拡径さ
れて、後述するプラグ41の先端内周溝41dに係合し得
る。The fuel rod retractor 12 is driven by a drive mechanism 13 in the figure.
A moving table 14 that moves in the AB direction is provided. A plurality of fuel rod retraction tools 15 are removably attached to the moving base 14. The fuel rod retraction tool 15 is composed of a pull rod and an inner rod, and the pull rod has a structure in which a finger 16 is connected to the tip of a guide tube by screw fitting (see FIG. 6). The finger 16 has a tubular shape with its tip closed, and its tip side is tapered. Further, the finger 16 is divided into a plurality of portions (for example, 4 divisions or 6 divisions) in the circumferential direction from the center to the tip end side to form a leaf spring, and an outer claw 17 is formed at the tip thereof. Outer nail
When the inner rod in the pull rod is moved forward, the tapered surface of the inner peripheral portion of the finger 17 is pressed to increase the diameter of the rod 17, and the rod 17 can engage with a tip inner peripheral groove 41d of the plug 41 described later.

以上の構成は、従来からある燃料集合体の組立装置と
ほぼ同じである。The above configuration is almost the same as that of a conventional fuel assembly assembly apparatus.

本装置において、新設したところは以下に説明すると
ころである。The newly installed part of this device will be described below.

すなわち、第２図〜第５図で示す如く燃料棒マガジン
10の組立台11側の支柱20は、レール21に沿って、燃料棒
６の移動方向と直交する方向に移動自在とされている。
また、レール21上には、組立台11上に移動された各燃料
棒６の後端を把持する燃料把持機22が、同レール21に沿
って移動自在に配設されている。That is, as shown in FIGS. 2 to 5, the fuel rod magazine
The column 20 on the side of the assembly table 11 of 10 is movable along the rail 21 in the direction orthogonal to the moving direction of the fuel rod 6.
Further, on the rail 21, a fuel gripping machine 22 that grips the rear end of each fuel rod 6 moved onto the assembly table 11 is movably arranged along the rail 21.

燃料棒把持機22について説明すると、第７図中符号25
はAB方向に移動自在とされた移動台を示し、この移動台
25には、ロッド27および連結部材28を介して外筒26が取
り付けられている。外筒26は図では１つしか示してない
が、実際には燃料集合体の組み込まれる燃料棒６に対応
して複数設けられている。外筒26は燃料棒６の後端部外
周に嵌合される。外筒26の先端から若干奥方へ入った内
周部には弾性材料（例えば、ポリウレタン）からなる内
筒体29が嵌め込まれている。外筒26内にはインナーロッ
ド30が軸線方向に沿って移動自在に配設されている。イ
ンナーロッド30の先端には燃料棒６の後端外周に嵌合す
る内筒部30aが設けられている。The fuel rod gripping machine 22 will be described with reference numeral 25 in FIG.
Indicates a movable table that can be moved in the AB direction.
An outer cylinder 26 is attached to 25 via a rod 27 and a connecting member 28. Although only one outer cylinder 26 is shown in the drawing, a plurality of outer cylinders 26 are actually provided corresponding to the fuel rods 6 in which the fuel assemblies are incorporated. The outer cylinder 26 is fitted around the rear end of the fuel rod 6. An inner cylinder body 29 made of an elastic material (for example, polyurethane) is fitted into an inner peripheral portion of the outer cylinder 26, which is slightly inward from the front end. An inner rod 30 is provided in the outer cylinder 26 so as to be movable along the axial direction. At the tip of the inner rod 30, an inner cylinder portion 30a fitted to the outer periphery of the rear end of the fuel rod 6 is provided.

インナーロッド30は前記ロッド27の外周にAB移動自在
とされたスライダ31に連結されている。スライダ31は、
ピン32を中心に回動するアーム33によってＡ方向へ移動
されるとき、インナーロッド30をＡ方向へ移動させて、
インナーロッド先端の円筒部30aと、外筒26の内周部先
端の突出部26aとの間で、円筒体29を挟む。円筒体29は
外方への移動が規制されている関係上、内方へ膨らみ、
燃料棒６後端を押圧把持する。なお、スライダ31あるい
はインナーロッド30には復帰用のバネ（図示せず）が取
り付けられ、アーム33が第７図で示す元の位置に戻った
ときに、バネの復元力によってインナーロッド30をＢ方
向に移動させて、円筒体29の押圧を解除する。円筒体29
は自身の弾性作用によって元の状態に戻り、燃料棒６の
把持を解く。The inner rod 30 is connected to a slider 31 which is AB-movable on the outer periphery of the rod 27. Slider 31
When it is moved in the A direction by the arm 33 that rotates about the pin 32, the inner rod 30 is moved in the A direction,
The cylindrical body 29 is sandwiched between the cylindrical portion 30a at the tip of the inner rod and the protruding portion 26a at the tip of the inner peripheral portion of the outer cylinder 26. The cylindrical body 29 swells inward because the outward movement is restricted,
The rear end of the fuel rod 6 is pressed and gripped. A spring (not shown) for returning is attached to the slider 31 or the inner rod 30, and when the arm 33 returns to the original position shown in FIG. In a direction to release the pressing force of the cylindrical body 29. Cylindrical body 29
Returns to its original state by its own elastic action and releases the grip of the fuel rod 6.

また、前記燃料棒引き込み機12にはカバー除去機35が
併設され、燃料棒引き込み機12およびカバー除去機35は
レール36に沿って、燃料棒６の移動方向と直交する方向
に移動自在とされている。The fuel rod retractor 12 is also provided with a cover remover 35, and the fuel rod retractor 12 and the cover remover 35 are movable along a rail 36 in a direction orthogonal to the moving direction of the fuel rod 6. ing.

上記カバー除去機35は、前記燃料棒引き込み機12とほ
ぼ同一の構成となっている。すなわち、前記燃料引き込
み機12には駆動機構によって図中AB方向にへ移動する移
動台（ともに図示せず）が配設され、移動台には複数の
カバー引き込み工具37が着脱自在に取り付けられてい
る。カバー引き込み工具37は、前記燃料棒引き込み工具
15とほぼ同一の構成のもので、プルロッドとインナーロ
ッドとを有し、プルロッドの先端にはフインガ38が取り
付けられている（第１図参照）。フインガ38は、前述し
たフインガ16と同一のもので、インナーロッドが先方へ
移動するとき、フインガ内周部のテーパー面を押されて
先端の外爪39が拡径し、該外爪39がプラグ41の先端内周
溝41dに係合し得るようになっている。The cover remover 35 has substantially the same structure as the fuel rod retractor 12. That is, the fuel retractor 12 is provided with a movable table (both not shown) that moves in the AB direction in the figure by a drive mechanism, and a plurality of cover retracting tools 37 are detachably attached to the movable table. There is. The cover retraction tool 37 is the fuel rod retraction tool.
It has substantially the same structure as 15, and has a pull rod and an inner rod, and a finger 38 is attached to the tip of the pull rod (see FIG. 1). The finger 38 is the same as the finger 16 described above, and when the inner rod moves forward, the tapered surface of the inner peripheral portion of the finger is pressed to expand the outer claw 39 at the tip, and the outer claw 39 is plugged. It can be engaged with the inner circumferential groove 41d at the tip of 41.

なお、このようにほぼ同一構成である、燃料棒引き込
み機12とカバー除去機35とを別個に設けたのは、カバー
除去機35によって取り外したカバー40およびプラグ41
を、再利用のため該カバー除去機35から取り外す作業
と、燃料棒引き込み機12によるマガジン10からの燃料棒
６の引き込み作業とを並行して行うためであり、また、
双方の引き込み距離が異なるためである。次に、上記装
置を用いた燃料集合体の組み立て方法について説明す
る。Note that the fuel rod retractor 12 and the cover remover 35, which have almost the same structure as described above, are separately provided because the cover 40 and the plug 41 removed by the cover remover 35 are provided.
Is performed in parallel with the work of removing from the cover removing machine 35 for reuse and the work of drawing the fuel rods 6 from the magazine 10 by the fuel rod drawing machine 12.
This is because the pulling distances of both are different. Next, a method for assembling a fuel assembly using the above device will be described.

まず、第１図および第６図に示すように、燃料棒６の
外周部の後端を残すほぼ全域を円筒状のカバー40で覆
う。該カバー40は金属製のものでもプラスチック製のも
のでもよく、燃料棒６を覆い得るよう、内径を燃料棒６
の径l0よりも大きく設定されていればよい。First, as shown in FIG. 1 and FIG. 6, a cylindrical cover 40 covers almost the entire area of the outer periphery of the fuel rod 6 except the rear end. The cover 40 may be made of metal or plastic and has an inner diameter of the fuel rod 6 so as to cover the fuel rod 6.
The diameter may be set larger than the diameter l 0 .

カバー40の先端（燃料棒の移動方向前方）には、プラ
グ41が溶接等適宜固定手段で取り付けてある。プラグ41
は、第10図で示すスプリング８あるいはデインプル７に
当接してスプリング８を変形させ、セル９を押し広げて
ものであり、同プラグ41は、セル径よりも小さく設定さ
れた先端小径部41aと、セル９を押し広げ得るよう、そ
の径l2を前記カバー40の外形l1よりもさらに大径に設定
された後端の大径部41cと、両部分41a、41cをつなぐ中
間のテーパ部41bとを備える。A plug 41 is attached to the tip of the cover 40 (on the front side in the moving direction of the fuel rod) by an appropriate fixing means such as welding. Plug 41
Is for abutting against the spring 8 or dimple 7 shown in FIG. 10 to deform the spring 8 and push the cell 9 apart, and the plug 41 has a tip small diameter portion 41a smaller than the cell diameter. , A large diameter portion 41c at the rear end whose diameter l 2 is set to be larger than the outer diameter l 1 of the cover 40 so that the cell 9 can be expanded, and an intermediate taper portion connecting both portions 41a, 41c. 41b and.

なお、この例においては、カバー40の外径をプラグ41
の大径部外径より小に設定しているが、同じ大きさに設
定してもよい。In addition, in this example, the outer diameter of the cover 40 is set to the plug 41.
Although it is set to be smaller than the outer diameter of the large-diameter portion, it may be set to the same size.

小径部41aの先端には、前記燃料棒引き込み工具15お
よびカバー引き込み工具37の外爪17、39にそれぞれ係合
する内周溝41dが形成されている。また、大径部41cの後
側には、外周に前記カバー40が嵌合状態で連結される連
結部41eが設けられている。An inner peripheral groove 41d that engages with the outer claws 17 and 39 of the fuel rod retraction tool 15 and the cover retraction tool 37 is formed at the tip of the small diameter portion 41a. Further, on the rear side of the large diameter portion 41c, a connecting portion 41e to which the cover 40 is connected in a fitted state is provided on the outer periphery.

上記カバー40で覆われかつ先端にプラグ41が取り付け
られた燃料棒６を、プラグ41を移動方向前方へ向けて燃
料棒マガジン10に組み込む。The fuel rod 6 covered with the cover 40 and having the plug 41 attached to the tip thereof is incorporated into the fuel rod magazine 10 with the plug 41 facing forward in the moving direction.

次に、第２図、第３図に示す如く、組立台11の前方に
配置させた燃料棒引き込み機12から、移動台14の移動に
より燃料棒引き込み工具15を後方に延ばし、先端に取り
付けたフインガ16の外爪17を、前述した如きインナーロ
ッドの移動操作によってプラグ41後端の内周溝41dに係
合させ、この状態で引き込み工具15を前方へ引き込み、
燃料棒６を組立台11で支持している各支持格子４に挿入
する。Next, as shown in FIGS. 2 and 3, from the fuel rod retractor 12 arranged in front of the assembly table 11, the fuel rod retractor 15 is extended rearward by the movement of the movable base 14 and attached to the tip. The outer claw 17 of the finger 16 is engaged with the inner peripheral groove 41d at the rear end of the plug 41 by the movement operation of the inner rod as described above, and in this state, the pulling tool 15 is pulled forward,
The fuel rods 6 are inserted into the support grids 4 supported by the assembly table 11.

このとき、燃料棒挿入の前にプラグ41がスプリング８
およびデインプル７に当接して、セル９を拡径する。し
たがって、スプリング８の押圧力調整が行なえ、かつ、
それらを燃料棒６の挿入と同時に行なうことができる。
したがって、たとえ、燃料棒６の外周部を覆うカバー40
が柔らかい材料で作った場合でも、燃料棒６外周部にス
クラッチは殆ど生じない。At this time, the plug 41 moves the spring 8 before the fuel rod is inserted.
Then, the cell 9 is expanded by abutting on the dimple 7. Therefore, the pressing force of the spring 8 can be adjusted, and
They can be done simultaneously with the insertion of the fuel rods 6.
Therefore, even if the cover 40 covering the outer peripheral portion of the fuel rod 6 is used,
Even if it is made of a soft material, scratches hardly occur on the outer peripheral portion of the fuel rod 6.

また、上記燃料棒６の挿入において、先端にプラグ41
のついたカバー40の燃料棒６とは、特別な固定手段を用
いていない。これは、燃料棒６が長く（例えば４〜5m）
燃料棒６とカバー40との接触面積を広く採れるため、両
者に発生する摩擦力によって、燃料棒６をカバー40と一
体的に移動できるためである。Further, when the fuel rod 6 is inserted, the plug 41 is attached to the tip.
The fuel rod 6 of the covered cover 40 does not use any special fixing means. This is because the fuel rod 6 is long (for example, 4-5m)
This is because the contact area between the fuel rod 6 and the cover 40 can be widened, and thus the fuel rod 6 can be moved integrally with the cover 40 by the frictional force generated therebetween.

上記燃料棒６の支持格子４への挿入操作の後、燃料棒
引き込み工具15のインナーロッドを後退させて外爪17と
プラグ41との係合を解く。そして、燃料棒引き込み工具
15をさらに若干前方へ移動させた後、燃料棒引き込み機
12およびカバー除去機35を第５図に示す如くＣ方向にず
らし、カバー除去機35を組立台11の前方に位置させる。After the insertion operation of the fuel rod 6 into the support grid 4, the inner rod of the fuel rod retraction tool 15 is retracted to release the engagement between the outer claw 17 and the plug 41. And the fuel rod retraction tool
After moving 15 a little further forward, the fuel rod retractor
12 and the cover remover 35 are displaced in the C direction as shown in FIG. 5, and the cover remover 35 is positioned in front of the assembly table 11.

上記操作に並行して、燃料棒マガジン10の前側の支柱
20および燃料棒把持機22をＤ方向へずらし、燃料棒把持
機22を組立台11の後方に位置させる。In parallel with the above operation, the front column of the fuel rod magazine 10
20 and the fuel rod gripper 22 are displaced in the D direction, and the fuel rod gripper 22 is positioned behind the assembly table 11.

次に、燃料棒把持機22の移動台25を第７図中Ａ方向へ
移動させ、外筒26の先端を燃料棒６の後端に嵌合させ
る。そして、前述した如くアーム33を回動しインナーロ
ッド30をＢ方向に移動させて、同把持機22の外筒26内に
組み込んだ円筒体29により燃料棒６の後端を把持する
（第１図参照）。Next, the moving table 25 of the fuel rod gripping machine 22 is moved in the direction A in FIG. 7, and the tip of the outer cylinder 26 is fitted to the rear end of the fuel rod 6. Then, as described above, the arm 33 is rotated to move the inner rod 30 in the B direction, and the rear end of the fuel rod 6 is gripped by the cylindrical body 29 incorporated in the outer cylinder 26 of the gripping machine 22 (first See figure).

次いで、カバー除去機35のカバー引き込み工具37を後
方（第５図中Ｂ方向）へ若干移動させて、前述した操作
によりフインガ38の外爪39を拡径させてプラグ41の内周
溝41dに係合する。この状態で、フインガ38を前方へ移
動させて、同プラグおよびカバー40を燃料棒６から引き
抜き除去する。Then, the cover pull-in tool 37 of the cover remover 35 is slightly moved rearward (direction B in FIG. 5), and the outer claw 39 of the finger 38 is expanded in diameter by the above-described operation to the inner peripheral groove 41d of the plug 41. Engage. In this state, the finger 38 is moved forward to pull out and remove the plug and the cover 40 from the fuel rod 6.

以上の操作によって、燃料棒６を外周部にスクラッチ
を形成させることなく、支持格子４内に挿入セットする
ことができる。By the above operation, the fuel rod 6 can be inserted and set in the support grid 4 without forming a scratch on the outer peripheral portion.

「発明の効果」 以上説明したように、本発明の燃料集合体の組立方法
によれば、燃料棒の外周部ほぼ全域を円筒状のカバーで
覆うとともに、該カバーの先端に、前記セルに押し広げ
るべくその径を前記カバーの径以上に設定され且つセル
径より小さい先端小径部を有するプラグを取り付け、前
記カバーで覆った状態のまま燃料棒を、前記プラグを移
動方向前側として前記セル内に挿入し、次いで、燃料棒
の後端を把持し前記プラグ及びカバーをさらに前方へ移
動させて燃料棒から取り外すから、燃料棒をセルへ挿入
する際、同燃料棒の外周部がセルと接触するのを防止で
き、スクラッチの発生を防止できる。また、支持格子の
セル内へのプラグ挿通を、燃料棒の挿入と同時に行な
え、従来の方法のような、燃料棒の挿入とは別にプラグ
を挿通させる等の面倒な作業を行なう必要はない。[Advantages of the Invention] As described above, according to the method for assembling a fuel assembly of the present invention, the outer peripheral portion of the fuel rod is covered almost entirely with a cylindrical cover, and the tip of the cover pushes the cell. To expand the diameter of the cover, attach a plug with a small tip that is smaller than the diameter of the cover and smaller than the cell diameter, and keep the fuel rod in the cell with the cover covered with the plug in front of the moving direction. After inserting the fuel rod, the rear end of the fuel rod is grasped and the plug and the cover are moved further forward to be removed from the fuel rod. It is possible to prevent the occurrence of scratches. Further, the plug of the support grid can be inserted into the cell at the same time as the fuel rod is inserted, and it is not necessary to perform the troublesome work such as the insertion of the plug separately from the insertion of the fuel rod as in the conventional method.

また、本発明の燃料集合体の組立装置によれば、燃料
棒引き込み機とカバー除去機とが別個に設けられている
ので、燃料棒引き込み機が燃料棒を支持格子内に引き込
む作業を行っている際に、燃料棒引き込み機の側方で休
止しているカバー除去機からカバーとプラグとを取り除
くことができる。また、カバーを燃料棒から取り外す際
には、燃料棒把持機が燃料棒移動方向に対して側方側に
移動して燃料棒マガジンと入れ替わるとともに、カバー
除去機が燃料棒移動方向に対して側方側に移動して燃料
棒引き込み機と入れ替わるので、カバーおよびプラグを
燃料棒から取り外す作業を迅速に行うことができる。Further, according to the fuel assembly assembling apparatus of the present invention, since the fuel rod retractor and the cover remover are separately provided, the fuel rod retractor performs the work of retracting the fuel rod into the support grid. The cover and plug can be removed from the cover remover, which is dormant to the side of the fuel rod retractor when the cover is removed. When removing the cover from the fuel rod, the fuel rod gripper moves laterally with respect to the fuel rod moving direction to replace the fuel rod magazine, and the cover remover moves sideways with respect to the fuel rod moving direction. Since it moves to the side and replaces the fuel rod retractor, the work of removing the cover and the plug from the fuel rod can be performed quickly.

これにより、本発明の燃料集合体の組立装置によれ
ば、燃料集合体の組立作業を効率よく迅速に行うことが
できる。As a result, according to the fuel assembly assembling apparatus of the present invention, the assembly operation of the fuel assembly can be performed efficiently and promptly.

【図面の簡単な説明】[Brief description of drawings]

第１図〜第８図は本発明装置の一実施例を示し、第１図
は後述する第４図におけるＩ矢視部分の拡大詳細図、第
２図は装置の側面図、第３図は同平面図、第４図は同装
置の燃料集合対組立途中の状態を示す側面図、第５図は
同平面図、第６図は第２図におけるVI矢視部分の拡大詳
細図、第７図は第４図におけるVII矢視部分後拡大詳細
図、第８図は第７図のVIII−VIII線に沿う断面図。第９
図は燃料集合体の正面図、第10図は第８図に示す支持格
子の一部平面図である。 ４……支持格子、６……燃料棒、 ７……テインプル、８……スプリング、 ９……セル、10……燃料棒マガジン、 11……組立台、12……燃料棒引き込み機、 15……燃料棒引き込み工具、16……フインガ、 17……外爪、21……レール、 22……燃料棒把持機、26……外筒、 29……円筒体、35……カバー除去機、 36……レール、37……カバー引き込み工具、 38……フインガ、39……外爪、 40……カバー、41……プラグ、 41d……内周溝。1 to 8 show one embodiment of the device of the present invention, FIG. 1 is an enlarged detailed view of a portion viewed from an arrow I in FIG. 4 which will be described later, FIG. 2 is a side view of the device, and FIG. The same plan view, FIG. 4 is a side view showing a state in which the fuel assembly of the device is being assembled, FIG. 5 is the same plan view, and FIG. 6 is an enlarged detailed view of a VI arrow portion in FIG. FIG. 8 is an enlarged detail view after the portion taken along the arrow VII in FIG. 4, and FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. Ninth
FIG. 10 is a front view of the fuel assembly, and FIG. 10 is a partial plan view of the support grid shown in FIG. 4 ... Support grid, 6 ... Fuel rod, 7 ... Tape, 8 ... Spring, 9 ... Cell, 10 ... Fuel rod magazine, 11 ... Assembly stand, 12 ... Fuel rod retractor, 15 ... … Fuel rod retraction tool, 16 …… Finger, 17 …… Outer claw, 21 …… Rail, 22 …… Fuel rod gripper, 26 …… Outer cylinder, 29 …… Cylindrical body, 35 …… Cover remover, 36 ...... Rail, 37 …… Cover retracting tool, 38 …… Finger, 39 …… Outer claw, 40 …… Cover, 41 …… Plug, 41 d …… Inner groove.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】軸線方向に所定間隔をもって配置された支
持格子の、少なくとも１つの燃料棒押圧用弾性部材を有
するセル内に、それぞれ燃料棒を挿入配置してなる燃料
集合体を組み立てるに際し、燃料棒の外周部ほぼ全域を
円筒状のカバーで覆うとともに、該カバーの先端に、前
記セルに押し広げるべくその径を前記カバーの径以上に
設定され且つセル径より小さい先端小径部を有するプラ
グを取り付け、前記カバーで覆った状態のまま燃料棒
を、前記プラグを移動方向前側として前記セル内に挿入
し、次いで、燃料棒の後端を把持し前記プラグ及びカバ
ーをさらに前方へ移動させて燃料棒から取り出すことを
特徴とする燃料集合体の組立方法。1. When assembling a fuel assembly in which fuel rods are inserted and arranged in cells having at least one elastic member for pushing a fuel rod in a support grid arranged at a predetermined interval in the axial direction, A cylindrical cover covers almost the entire outer peripheral portion of the rod, and at the tip of the cover, a plug having a small tip portion whose diameter is set to be equal to or larger than the diameter of the cover so as to be spread to the cell and smaller than the cell diameter. With the fuel rod attached and covered with the cover, the fuel rod is inserted into the cell with the plug as the front side in the moving direction, and then the rear end of the fuel rod is gripped to move the plug and the cover further forward to move the fuel. A method for assembling a fuel assembly, characterized by taking out from a rod. 【請求項２】軸線方向に所定間隔きに配置した状態で支
持格子を支持する組立台と、 該組立台の後方に配置されて、先端にセル押し広げ用の
プラグを有する円筒状のカバーで覆われた多数の燃料棒
を、所定間隔置きに並列に保持するとともに、燃料棒移
動方向に対して側方に移動自在とされている燃料棒マガ
ジンと、 前記組立台の前方に配され、内蔵された燃料棒引き込み
工具を後方へ移動させて、前記燃料棒マガジンに収納し
ている前記燃料棒の先端に位置する前記プラグと係合
し、該プラグを前方へ引き込むことにより、前記燃料棒
を組立台で支持して前記支持格子に挿通させるととも
に、燃料棒移動方向に対して側方に移動自在とされてい
る燃料棒引き込み機と、 前記燃料棒マガジンに並設され、該燃料棒マガジンが燃
料棒移動方向に対して側方にずれたとき燃料棒移動方向
に対して側方に移動して前記組立台の後方に位置し、燃
料棒の後端を把持する燃料棒把持機と、 前記燃料棒引き込み機に並設され、該燃料棒引き込み機
が燃料棒移動方向に対して側方にずれたとき燃料棒移動
方向に対し側方に移動して前記組立台の前方に位置し、
前記プラグと係合して該プラグを前記カバーごと前方へ
移動させて燃料棒から取り出すカバー除去機とを備えて
なることを特徴とする燃料集合体の組立装置。2. An assembly base for supporting a support grid in a state of being arranged at predetermined intervals in the axial direction, and a cylindrical cover arranged at the rear of the assembly base and having a plug for expanding cells at the tip. A fuel rod magazine that holds a large number of covered fuel rods in parallel at predetermined intervals and is movable laterally with respect to the fuel rod moving direction; The fuel rod retracting tool is moved rearward to engage with the plug located at the tip of the fuel rod housed in the fuel rod magazine, and the plug is pulled forward to pull the fuel rod forward. A fuel rod retractor that is supported by an assembly table and inserted into the support grid and is movable laterally with respect to the fuel rod moving direction; and a fuel rod magazine that is installed in parallel with the fuel rod magazine. Fuel rod movement direction On the other hand, when it is displaced laterally, it moves laterally with respect to the direction of movement of the fuel rod, is located behind the assembly table, and holds the rear end of the fuel rod. Are arranged in parallel, and when the fuel rod retractor is laterally displaced with respect to the fuel rod moving direction, the fuel rod retracting device is moved laterally with respect to the fuel rod moving direction and is positioned in front of the assembly table,
A device for assembling a fuel assembly, comprising: a cover removing device that engages with the plug and moves the plug together with the cover forward to take out the fuel rod.
JP63301964A 1988-11-29 1988-11-29 Assembly method and apparatus for fuel assembly Expired - Lifetime JPH083553B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63301964A JPH083553B2 (en) 1988-11-29 1988-11-29 Assembly method and apparatus for fuel assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63301964A JPH083553B2 (en) 1988-11-29 1988-11-29 Assembly method and apparatus for fuel assembly

Publications (2)

Publication Number Publication Date
JPH02147897A JPH02147897A (en) 1990-06-06
JPH083553B2 true JPH083553B2 (en) 1996-01-17

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Application Number Title Priority Date Filing Date
JP63301964A Expired - Lifetime JPH083553B2 (en) 1988-11-29 1988-11-29 Assembly method and apparatus for fuel assembly

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JP (1) JPH083553B2 (en)

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KR102040128B1 (en) * 2018-01-29 2019-11-05 한전원자력연료 주식회사 A nuclear fuel road end gap adjusting device

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JPS5311294A (en) * 1976-07-17 1978-02-01 Genshi Nenryo Kogyo Method of assembling reactor fuel assembly
JPS60181680A (en) * 1984-02-29 1985-09-17 日本ニユクリア・フユエル株式会社 Method of assembling and overhauling nuclear fuel aggregate
JPS60225998A (en) * 1984-04-24 1985-11-11 三菱電機株式会社 Home security sensor transmission system

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