JPH04109198A - Assembling method for fuel assembly - Google Patents
Assembling method for fuel assemblyInfo
- Publication number
- JPH04109198A JPH04109198A JP2228704A JP22870490A JPH04109198A JP H04109198 A JPH04109198 A JP H04109198A JP 2228704 A JP2228704 A JP 2228704A JP 22870490 A JP22870490 A JP 22870490A JP H04109198 A JPH04109198 A JP H04109198A
- Authority
- JP
- Japan
- Prior art keywords
- thimble
- control rod
- rod guide
- screw
- mounting hole
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 19
- 238000003780 insertion Methods 0.000 abstract description 6
- 230000037431 insertion Effects 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001007 puffing effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
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
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は主として加圧木型原子炉で使用されるPWR燃
料集合体の組立方法に関し、詳しくは制御棒案内シンプ
ルを下部ノズルの取付穴を介しシンプルスクリューにて
該下部ノズルに固定するにあたり、使用部材の低減、溶
接箇所の低減、及び組立作業の簡略化を目的とした燃料
集合体の組立方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of assembling a PWR fuel assembly mainly used in a pressurized wooden nuclear reactor. The present invention relates to a method for assembling a fuel assembly for the purpose of reducing the number of parts used, reducing the number of welding parts, and simplifying the assembly work when fixing the fuel assembly to the lower nozzle using a simple screw.
(従来の技術)
第7図に示す如きPWR燃料集合体は従来、その組立に
際しては一例として組立ドラムと呼ばれる支持格子位置
決め装置(図示せず)に支持格子(3)をセット固定し
、炉内計装用案内シンプル(7)及び燃料棒(8)を挿
入した後、制御棒案内シンプル(1)を挿入し、さらに
この制御棒案内シンプル(1)の両端付近をスウェージ
法による拡管作業にて、最上。(Prior Art) Conventionally, when assembling a PWR fuel assembly as shown in FIG. 7, a support grid (3) is set and fixed to a support grid positioning device (not shown) called an assembly drum, and then After inserting the instrumentation guide simple (7) and fuel rods (8), insert the control rod guide simple (1), and expand the vicinity of both ends of the control rod guide simple (1) using the swaging method. Mogami.
最下部支持格子(3)、 (31に固定し、最後に上、
下部ノズル(9)、 (4)を取付ける方法が用いられ
ている。Lowermost support grid (3), (fixed to 31, and finally upper,
A method of attaching the lower nozzles (9), (4) is used.
この内、制御棒案内シンプル(1)と下部ノズル(4)
の従来の固定は第5図、第6図に示す通りであり、制御
棒案内シンプル(1)下端部に内ねじが切られた下部端
栓αωをTig溶接により固着し、下部ノズル(4)の
取付穴(6)に螺着されたブッシングαυを介してシン
プルスクリュー(5)を上記下部端栓αωの内ねしに螺
合締着した後、このシンプルスクリュー(5)と下部ノ
ズル(4)とを2箇所スポツト溶接することによりなさ
れている(図中(2)はスリーブである)。Among these, the control rod guide simple (1) and the lower nozzle (4)
The conventional method of fixing is as shown in Figs. 5 and 6, in which a simple control rod guide (1) is fixed with a lower end plug αω with an internal thread cut on the lower end by TIG welding, and a lower nozzle (4) After screwing and tightening the simple screw (5) to the inner thread of the lower end plug αω through the bushing αυ screwed into the mounting hole (6), connect the simple screw (5) and the lower nozzle (4 ) by spot welding them at two locations ((2) in the figure is the sleeve).
(発明が解決しようとする課題)
ところが、上記の如き制御棒案内シンプルと下部ノズル
の固定においては下記のような問題がある。(Problems to be Solved by the Invention) However, the simple control rod guide and fixation of the lower nozzle as described above have the following problems.
■
制御棒案内シンプル下端部には下部端栓が溶接されてい
るため、前述の最下部支持格子固定のためのスウェージ
作業においてスウエージ棒を制御棒案内シンプル下部側
から挿入することができない、そこで、上記シンプル上
部側から作業を行うことになるが、スウエージ捧が全長
約4.5mと長尺になり、正確なスウェージの防げとな
ってスウェージ部の膨らみにばらつきが生じやすく、ま
たスウェージ棒の挿脱時にシンプル内部の全長にわたっ
て傷を付ける恐れがある。■ Since the lower end plug is welded to the lower end of the control rod guide simple, it is not possible to insert the swage rod from the lower side of the control rod guide simple during the swaging work to fix the lowest support grid mentioned above. Work will be done from the top side of the simple above, but the swage rod is long with a total length of about 4.5 m, which prevents accurate swaging, which tends to cause unevenness in the bulge of the swage part, and when inserting the swage rod. When removed, there is a risk of scratching the entire length of the inside of the simplex.
■ 制御棒案内シンプルは製造時あるいはスウェージ作
業による縮み代のばらつきにより、その全長が個々にお
いて異なるため、組立時には長さ調整用の前記ブッシン
グを必要とする。更にこのブッシングは回り止めのため
に、シンプル長さ調整後、下部ノズルと該下部ノズル上
面側において2箇所スポツト溶接を行うが、この溶接に
よって下部ノズルに歪を生じさせる恐れがある。また、
上記溶接によってはブッシングの調整ミスを起こす可能
性もあり、この場合には複数本ある制御棒案内シンプル
の長さ相互に違いが生じて下部ノズルが傾いて取付けら
れることとなる。■The overall length of simple control rod guides varies depending on the individual rod due to variations in shrinkage during manufacturing or swaging operations, so the bushing for length adjustment is required during assembly. Furthermore, in order to prevent rotation of this bushing, after simple length adjustment, spot welding is performed at two locations on the lower nozzle and the upper surface of the lower nozzle, but this welding may cause distortion in the lower nozzle. Also,
Depending on the welding described above, there is a possibility that a bushing adjustment error may occur, and in this case, the lengths of the plurality of control rod guide simples will differ, resulting in the lower nozzle being installed at an angle.
本発明は畝上の如き実情に対処すべく、特に制御棒案内
シンプルと下部ノズルの固定において新規な組立方法を
見出すことにより、使用部材や溶接箇所を減らし、かつ
組立作業の簡略化を図ることを目的とするものである。The present invention aims to reduce the number of used parts and welding points and simplify the assembly work by finding a new assembly method especially for simple control rod guide and fixing of the lower nozzle in order to deal with the actual situation such as on a ridge. The purpose is to
(課題を解決するための手段)
しかして、上記目的に適合する本発明燃料集合体の組立
方法の特徴は、下部ノズルに設けたシンプル取付穴を介
してシンプルスクリューにて下部ノズルに固定するに際
し、上記シンプル取付穴を上部を制御棒案内シンプルが
挿通しうる程度の小径部、その下部を上記小径部より大
径の大径部となし、さらにこの大径部と小径部の中間部
を円錐状の斜面に設けてテーパ凹部となし、このシンプ
ル取付穴に制御棒案内シンプル下部を挿入すると共に該
シンプル下端部を上記テーパ凹部にて該テーパ凹部と同
程度のテーパに拡管し、のち、上記テーパ凹部と嵌合す
る同程度のテーパの座面を有しかつ頭部に雄ねじを有す
るシンプルスクリューを上記シンプル取付穴大径部に設
けた雌ねじに螺合し締着することにある。(Means for Solving the Problems) The feature of the method for assembling the fuel assembly of the present invention that meets the above purpose is that when it is fixed to the lower nozzle with a simple screw through the simple mounting hole provided in the lower nozzle, , the upper part of the above simple mounting hole is a small diameter part that allows the control rod guide simple to be inserted through, the lower part is a large diameter part that is larger than the small diameter part, and the intermediate part between this large diameter part and the small diameter part is a conical part. A simple lower end of the control rod guide is inserted into this simple mounting hole, and the lower end of the simple is expanded to the same degree of taper as the tapered recess in the above-mentioned taper recess. A simple screw having a seat surface of the same degree of taper that fits into the tapered recess and having a male thread on the head is screwed into the female thread provided in the large diameter part of the simple mounting hole and fastened.
なお、上記制御棒案内シンプルの拡管は、油圧装置を用
いたスウェージ法により行うことが好適で、請求項2は
これを記載したものである。Note that it is preferable that the tube expansion of the control rod guide simple is carried out by a swage method using a hydraulic device, and claim 2 describes this.
(作用)
以上、順をおって本発明組立方法を説明すると、まず、
制御棒案内シンプルと最下部支持格子をスリーブを用い
てスウェージ作業により固定する。(Function) To explain the assembly method of the present invention in order, first,
Secure the control rod guide simple and the lowest support grid using a sleeve by swaging.
この状態において制御棒案内シンプルの下端部は上記シ
ンプル取付穴のテーパ凹部にある。In this state, the lower end of the control rod guide simple is in the tapered recess of the simple mounting hole.
次に下部ノズル下部側より油圧式等の拡管装置を用いて
テーパ凹部の制御棒案内シンプル下端部をフレア状に拡
管する。Next, from the lower side of the lower nozzle, the lower end of the control rod guide simple in the tapered concave portion is expanded into a flare shape using a hydraulic or other type tube expansion device.
最後に前記構成を有するシンプルスクリューを下部ノズ
ルシンプル取付穴に螺合させ締め付ける。Finally, the simple screw having the above configuration is screwed into the lower nozzle simple mounting hole and tightened.
拡管された制御棒案内シンプル下端部は、下部ノズルシ
ンプル取付穴のテーパ凹部とシンプルスクリューのテー
パ付座面とに挟持された格構となり、充分な強度をもっ
て下部ノズルに固定される。The expanded lower end of the control rod guide simple is sandwiched between the tapered recess of the lower nozzle simple mounting hole and the tapered seating surface of the simple screw, and is fixed to the lower nozzle with sufficient strength.
なお、制御棒案内シンプルの長さ調整は、上記下部ノズ
ルシンプル取付穴のテーパ凹部における上記案内シンプ
ル下端部の出代を調節することにより簡単に行うことが
可能である。The length of the control rod guide simple can be easily adjusted by adjusting the protrusion of the lower end of the guide simple in the tapered recess of the lower nozzle simple mounting hole.
(実施例)
以下、更に添付図面を参照して、本発明燃料集合体の組
立方法を説明する。(Example) Hereinafter, a method for assembling a fuel assembly of the present invention will be explained with further reference to the attached drawings.
第1図は本発明組立方法による制御棒案内シンプルと下
部ノズルの固定状態を示す断面図であり、第2図は第1
図の支持格子を省略した分解斜視図であり、図において
(1)は制御棒案内シンプル、(2)はスリーブ、(3
)は最下部支持格子、(4)は下部ノズル、(5)はシ
ンプルスクリューを夫々示している。FIG. 1 is a sectional view showing the fixed state of the control rod guide simple and the lower nozzle according to the assembly method of the present invention, and FIG.
It is an exploded perspective view with the support grid in the figure omitted, and in the figure (1) is a simple control rod guide, (2) is a sleeve, and (3) is a simple control rod guide.
) shows the lowermost support grid, (4) shows the lower nozzle, and (5) shows the simple screw, respectively.
本発明組立方法に使用される下部ノズル(4)のシンプ
ル取付穴(6)は、第1.第2図に示すように、上部が
制御棒案内シンプル(1)の外径より少し大きい径の小
径部(6a)に設けられると共にその下部が上記下径部
より大径の大径部(6b)に設けられ、またこの大径部
(6b)内側にはめねじが刻設されている。さらに、大
径部(6b)と小径部(6a)の中間部は円錐状の斜面
に設けられたテーパ凹部(6c)となさている。The simple mounting hole (6) of the lower nozzle (4) used in the assembly method of the present invention is the first. As shown in Fig. 2, the upper part is provided in the small diameter part (6a) with a diameter slightly larger than the outer diameter of the control rod guide simple (1), and the lower part is provided in the large diameter part (6b) with a larger diameter than the lower diameter part. ), and a female thread is carved inside this large diameter portion (6b). Further, the intermediate portion between the large diameter portion (6b) and the small diameter portion (6a) is a tapered recess (6c) provided on a conical slope.
そして、シンプルスクリュー(5)は、上記シンプル取
付穴(6)のテーパ凹部(6c)と嵌合する同テーパの
座面(5a)と、周面におねじが刻設された頭部(5b
)とを有し、さらにこの実施例では座面(5a)中心か
ら上方に向かい延設された、制御棒案内シンフル(11
下部に挿入される挿入部(5C)を有している。The simple screw (5) has a tapered bearing surface (5a) that fits into the tapered recess (6c) of the simple mounting hole (6), and a head (5b) with a thread carved on the circumference.
), and furthermore, in this embodiment, a control rod guide shingle (11) extending upward from the center of the seat surface (5a).
It has an insertion part (5C) inserted into the lower part.
この挿入部(5c)の外径は従来例で説明した下部端栓
の外径と同じに設けられている。The outer diameter of this insertion portion (5c) is set to be the same as the outer diameter of the lower end plug described in the conventional example.
また、制御棒案内シンプル(1)は組立前に下端部を端
面切断状態とし、その全長は下部ノズル(4)取付時に
該下部ノズルのシンプル取付穴(6)テーパ凹部(6C
)にその下端部が来る長さに予め仕上げておく。In addition, the lower end of the control rod guide simple (1) is cut off before assembly, and its total length is determined by the lower nozzle's simple mounting hole (6) and tapered recess (6C) when the lower nozzle (4) is installed.
). Finish the length in advance so that the bottom end is at the end.
次に上記の部材を用いた本発明実施例組立方法を説明す
る。Next, a method of assembling an embodiment of the present invention using the above-mentioned members will be explained.
まず、制御棒案内シンプル(1)と最下部支持格子(3
)とをスリーブ(2)を用いてスウエージ作業にて固定
する。この際、スウェージ作業は、組立装置(図示せず
)の下部側から油圧スウエージ装置のスウェージ棒(図
示せず)を挿入して行う。First, the control rod guide simple (1) and the lowest support grid (3)
) and are fixed by swaging using the sleeve (2). At this time, the swaging work is performed by inserting a swage rod (not shown) of a hydraulic swaging device from the lower side of the assembly device (not shown).
この状態において制御棒案内シンプル(1)下端部(l
a)は第3図に示すように上記シンプル取付穴(6)の
テーパ凹部(6C)にあるが、この下端部(la)の出
代により制御棒案内シンプル(1)の長さ調整を行う。In this state, the control rod guide simple (1) lower end (l
As shown in Figure 3, a) is located in the taper recess (6C) of the simple mounting hole (6), and the length of the simple control rod guide (1) is adjusted by the protrusion of this lower end (la). .
次に下部ノズル(4)下部側から油圧式等の拡管装置を
用いて、制御棒案内シンプル(1)下端部(1a)をテ
ーパ凹部(6c)のテーパに沿うよう、第4図に示すよ
うに拡管する。Next, from the lower side of the lower nozzle (4), use a hydraulic pipe expansion device to align the lower end (1a) of the control rod guide simple (1) with the taper of the tapered recess (6c) as shown in Figure 4. Expand the tube to
最後にシンプルスクリュー(5)を第1図に示すように
、下部ノズル(4)のシンプル取付穴(6)に螺合締着
し、シンプルスクリュー(5)と下部ノズル(4)を1
80度方向で2箇所スポツト溶接して回り止めとする。Finally, as shown in Figure 1, screw and tighten the simple screw (5) into the simple mounting hole (6) of the lower nozzle (4), and connect the simple screw (5) and the lower nozzle (4) together.
Spot weld in two places at 80 degrees to prevent rotation.
これにより、制御棒案内シンプル(1)はその下端部(
1a)が、シンプル取付穴(6)のテーパ凹部(6c)
とシンプルスクリュー(5)のテーパ付座面(5a)と
に挟持されると共に、シンプルスクリュー(5)の挿入
部(5c)が挿入されて、充分な強度をもって下部ノズ
ル(4に固定される。As a result, the control rod guide simple (1) has its lower end (
1a) is the tapered recess (6c) of the simple mounting hole (6)
and the tapered seat surface (5a) of the simple screw (5), and the insertion part (5c) of the simple screw (5) is inserted and fixed to the lower nozzle (4) with sufficient strength.
以上により、制御棒案内シンプルと下部ノズルとの固定
は完了するが、制御棒案内シンプル下端部の拡管作業は
、複数あるシンプルの全部を同時に行ってもよいし、ま
た1本ずつ行ってもよい。With the above steps, the fixation of the control rod guide simple and the lower nozzle is completed. However, the tube expansion work for the lower end of the control rod guide simple can be performed on all of the control rod guide simples at the same time, or one by one. .
また、シンプルスクリューの下部ノズルへの螺合締着は
トルク管理を行うことが望ましく、このトルクは100
〜120kg−1が好適である。In addition, it is desirable to manage the torque when tightening the simple screw to the lower nozzle, and this torque is 100
-120 kg-1 is suitable.
(発明の効果)
以上説明したように、本願発明の燃料集合体組立方法は
、下部ノズルに設けたシンプル取付穴にテーパ凹部を設
け、シンプル取付穴に挿入された制御棒案内シンプルを
該テーパ凹部にて略同テーパに拡管し、上記テーパ凹部
と嵌合しうるテーパの座面を有したシンプルスクリュー
で上記制御棒案内シンプル拡管部を締着し挟持するもの
であり、かかる構成により下記の如き効果を奏するもの
である。(Effects of the Invention) As explained above, in the fuel assembly assembly method of the present invention, a tapered recess is provided in the simple mounting hole provided in the lower nozzle, and the control rod guide simple inserted into the simple mounting hole is inserted into the tapered recess. The control rod guide simple tube expansion part is expanded to approximately the same taper at the same time, and the control rod guide simple expansion part is tightened and held by a simple screw having a tapered seating surface that can fit into the taper recess. It is effective.
■ 制御棒案内シンプルの全長のばらつき調整が下部ノ
ズルのテーパ凹部における上記シンプル下端部の出代で
吸収できるため、従来のプフシングによる調整が不要と
なり、ばらつき調整が簡単かつ正確に行えるようになっ
た。また、下部ノズルは常時燃料棒に密着した状態で取
付けられるようになった。 “■ 上
記の通りブッシングは不必要となってブッシング回り止
めの溶接を割愛できることから、下部ノズルの溶接によ
る歪が減少した。■ Adjustment of variations in the total length of the simple control rod guide can be absorbed by the protrusion of the lower end of the simple above in the taper recess of the lower nozzle, eliminating the need for adjustment using conventional puffing, making it easier and more accurate to adjust variations. . Additionally, the lower nozzle can now be attached in close contact with the fuel rod at all times. “■ As mentioned above, since the bushing is no longer necessary and welding of the bushing rotation stopper can be omitted, the distortion caused by welding of the lower nozzle has been reduced.
■ シンプル下部端栓が不要となり、また該下部端栓と
制御棒案内シンプルの溶接も不要となって、制御棒案内
シンプルの製造工程が簡略化された。■ The simple lower end plug is no longer required, and welding between the lower end plug and the control rod guide simple is no longer necessary, simplifying the manufacturing process of the control rod guide simple.
■ シンプル下部端栓がなくなって、最下部支持格子の
スウェージ作業が下部側から行えるようになり、これに
より作業性が向上すると共にスウェージ棒の挿入も短か
くてすむことから該スウェージ棒のばらつきがなくなっ
て均一なスウェージが可能となる。■ The simple bottom end plug has been eliminated, and the swaging work of the lowest support grid can now be done from the bottom side, which improves work efficiency and also reduces the variation in the swaging rod since the insertion of the swaging rod can be shortened. This allows for uniform swaging.
以上のように、本願発明は多数の有用な効果を有するも
のであり、今後の燃料集合体の組立においてその実効が
大いに期待される。As described above, the present invention has many useful effects, and is highly expected to be effective in assembling future fuel assemblies.
第1図は本発明組立方法による制御棒案内シンプルと下
部ノズルの固定を示す断面図、第2図は第1図の支持格
子を省略した分解斜視図、第3図及び第4図は夫々本発
明組立方法によるシンプル取付穴と制御棒案内シンプル
下端部とを示す拡大断面図、第5図は従来の方法による
制御棒案内シンプルと下部ノズルの固定を示す断面図、
第6図は同分解斜視部、第7図はPWR燃料集合体の概
要図である。
(1)・・・制御棒案内シンプル、
(2)・・・スリーブ、
(3)・・・支持格子、
(4)・・・下部ノズル、
(5)・・・シンプルスクリュー
(6)・・・シンプル取付穴、
(5a)・・・座面、 (5b)・・・頭部、 (5C
)・・・挿入部、(6a)・・・小径部、
(6b)・・・大径部、(6C)・・・テーパ凹部、第
2図
第3図
第4図
第
図Fig. 1 is a sectional view showing the fixing of the control rod guide simple and the lower nozzle by the assembly method of the present invention, Fig. 2 is an exploded perspective view with the support grid omitted from Fig. 1, and Figs. FIG. 5 is an enlarged cross-sectional view showing the simple mounting hole and the lower end of the control rod guide simple according to the invention assembling method; FIG.
FIG. 6 is an exploded perspective view of the same, and FIG. 7 is a schematic diagram of the PWR fuel assembly. (1)...Simple control rod guide, (2)...Sleeve, (3)...Support grid, (4)...Lower nozzle, (5)...Simple screw (6)...・Simple mounting hole, (5a)...Seating surface, (5b)...Head, (5C
)...insertion part, (6a)...small diameter part, (6b)...large diameter part, (6C)...tapered recessed part, Fig. 2, Fig. 3, Fig. 4, Fig.
Claims (1)
下部ノズルに設けたシンプル取付穴を介してシンプルス
クリューにて下部ノズルに固定するに際し、上記シンプ
ル取付穴を上部を制御棒案内シンプルが挿通しうる程度
の小径部、その下部を上記小径部より大径の大径部とな
し、かつさらに該大径部と小径部の中間部を円錐状の斜
面に設けてテーパ凹部となし、このシンプル取付穴に制
御棒案内シンプル下部を挿入すると共に該制御棒案内シ
ンプル下端部を上記テーパ凹部にて該テーパ凹部と同程
度のテーパに拡管し、後、上記テーパ凹部と嵌合する同
程度のテーパの座面を有しかつ頭部に雄ねじを有するシ
ンプルスクリューを上記シンプル取付穴大径部に設けた
雌ねじに螺合し締着することを特徴とする燃料集合体の
組立方法。 2、上記制御棒下端部の拡管が油圧装置を用いたスウェ
ージ法にてなされる請求項1記載の燃料集合体の組立方
法。[Claims] 1. In assembling the fuel assembly, when fixing the control rod guide simple to the lower nozzle with a simple screw through the simple mounting hole provided in the lower nozzle, the simple mounting hole controls the upper part. A small diameter portion that allows the rod guide simple to be inserted, a large diameter portion at the bottom that is larger than the small diameter portion, and an intermediate portion between the large diameter portion and the small diameter portion is provided with a conical slope to form a tapered recess. Then, insert the lower end of the control rod guide simple into this simple mounting hole, expand the lower end of the control rod guide simple in the taper recess to the same degree of taper as the taper recess, and then fit into the taper recess. A method for assembling a fuel assembly, characterized in that a simple screw having a seat surface with the same degree of taper and a male thread on the head is screwed into the female thread provided in the large diameter part of the simple mounting hole and tightened. . 2. The method of assembling a fuel assembly according to claim 1, wherein the tube expansion of the lower end of the control rod is performed by a swaging method using a hydraulic device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2228704A JPH0769458B2 (en) | 1990-08-29 | 1990-08-29 | Assembling method of fuel assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2228704A JPH0769458B2 (en) | 1990-08-29 | 1990-08-29 | Assembling method of fuel assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04109198A true JPH04109198A (en) | 1992-04-10 |
JPH0769458B2 JPH0769458B2 (en) | 1995-07-31 |
Family
ID=16880497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2228704A Expired - Fee Related JPH0769458B2 (en) | 1990-08-29 | 1990-08-29 | Assembling method of fuel assembly |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0769458B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007515651A (en) * | 2003-12-22 | 2007-06-14 | アレヴァ エヌペ | Terminal end piece for a fuel assembly having a nose for directing a flow of cooling fluid and a corresponding fuel assembly |
-
1990
- 1990-08-29 JP JP2228704A patent/JPH0769458B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007515651A (en) * | 2003-12-22 | 2007-06-14 | アレヴァ エヌペ | Terminal end piece for a fuel assembly having a nose for directing a flow of cooling fluid and a corresponding fuel assembly |
Also Published As
Publication number | Publication date |
---|---|
JPH0769458B2 (en) | 1995-07-31 |
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