JPH028678B2 - - Google Patents
Info
- Publication number
- JPH028678B2 JPH028678B2 JP59037982A JP3798284A JPH028678B2 JP H028678 B2 JPH028678 B2 JP H028678B2 JP 59037982 A JP59037982 A JP 59037982A JP 3798284 A JP3798284 A JP 3798284A JP H028678 B2 JPH028678 B2 JP H028678B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- fuel rod
- jig
- assembling
- cell
- 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
Links
- 239000000446 fuel Substances 0.000 claims description 89
- 125000006850 spacer group Chemical group 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 18
- 239000003758 nuclear fuel Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 229920006267 polyester film Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 9
- 230000037431 insertion Effects 0.000 description 9
- 239000010408 film Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003466 welding Methods 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は核燃料集合体の組立および解体方法に
係り、特にその組立或は解体時において燃料棒表
面に傷が発生することを確実に防止するようにし
た核燃料集合体の組立および解体方法に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for assembling and disassembling a nuclear fuel assembly, and in particular to a method for reliably preventing damage to the surface of fuel rods during assembly or disassembly. This invention relates to methods for assembling and disassembling nuclear fuel assemblies.
一般に、原子炉用の燃料集合体においては、そ
の長手方向複数個所に燃料棒スペーサを設け、複
数本の燃料棒の間隔保持を行なうようにしてあ
る。
Generally, in a fuel assembly for a nuclear reactor, fuel rod spacers are provided at a plurality of locations in the longitudinal direction of the fuel assembly to maintain the spacing between the plurality of fuel rods.
すなわち、第１図は上記原子炉用の燃料集合体
の縦断面図であつて、燃料チヤンネル１内には、
上下両端部をそれぞれ上部タイプレート２および
下部タイプレート３に支持された複数本の燃料棒
４およびウオータロツド５が配列装着されてお
り、さらに上記燃料棒４を整列支持し燃料棒４の
横方向の振動を拘束するとともに冷却材の流路を
確保するためのスペーサ６が、上記燃料棒４の軸
方向に複数個設けられている。 That is, FIG. 1 is a longitudinal cross-sectional view of the fuel assembly for the above-mentioned nuclear reactor, and in the fuel channel 1, there are
A plurality of fuel rods 4 and water rods 5 are installed in an array, with their upper and lower ends supported by an upper tie plate 2 and a lower tie plate 3, respectively. A plurality of spacers 6 are provided in the axial direction of the fuel rods 4 for restraining vibration and ensuring a coolant flow path.
上記スペーサ６は、第２図および第３図に示す
ように正方形の外枠７を有し、その外枠７内に互
いに格子状に配設されたバー８，９およびデイバ
イダー１０，１１によつて複数個のセル１２が形
成されている。また、上記バー８，９の各交差部
には、各側部に外側方に突出する板ばね部１３ａ
を有するランタンスプリング１３が装着されてお
り、上記各セル１２内に挿入された燃料棒４を、
セル１２の隅角部からデイバイダ１０，１１に形
成されたＳベンド１０ａ，１１ａに対して弾性的
に圧接するようにしてある。 The spacer 6 has a square outer frame 7, as shown in FIGS. 2 and 3, and is comprised of bars 8, 9 and dividers 10, 11 arranged in a grid pattern within the outer frame 7. A plurality of cells 12 are formed. Further, at each intersection of the bars 8 and 9, a leaf spring portion 13a protruding outward on each side is provided.
A lantern spring 13 having
The corners of the cells 12 are elastically pressed against S-bends 10a and 11a formed in the dividers 10 and 11.
そこで、上記核燃料集合体の組立てに際して
は、下部タイプレート３およびスペーサ６を所定
位置に固定し、燃料棒４およびウオータロツド５
をそれぞれスペーサ６のセル１２内に押し込み、
その下端を下部タイプレート３に装着し、上端に
上部タイプレート２を取りつけて固定する。 Therefore, when assembling the above-mentioned nuclear fuel assembly, the lower tie plate 3 and spacer 6 are fixed in a predetermined position, and the fuel rods 4 and water rods 5 are
are pushed into the cells 12 of the spacer 6,
The lower end is attached to the lower tie plate 3, and the upper tie plate 2 is attached and fixed to the upper end.
ところが、上述のような燃料集合体の組立てに
おいては、各燃料棒４をセル１２内に挿通させる
場合に、その燃料棒がスペーサ６のランタンスプ
リング１３の板ばね部１３ａおよびＳベンド１０
ａ，１１ａに摺接するため、燃料棒の表面に傷が
つくことがある。 However, in assembling the fuel assembly as described above, when each fuel rod 4 is inserted into the cell 12, the fuel rod is inserted into the leaf spring portion 13a of the lantern spring 13 of the spacer 6 and the S bend 10.
Since it comes into sliding contact with a and 11a, the surface of the fuel rod may be scratched.
したがつて、従来上記燃料棒の表面に傷がつく
ことを防止するために、スペーサ６のランタンス
プリング１３の板ばね部１３ａやＳベンド１０
ａ，１１ａをひもで縛りつけてばねの突出部を押
え、燃料棒を挿入する空間を大きくしたり、或は
燃料棒を氷点下に保存して表面に氷または霜の被
膜を形成させておいたり、または氷とアルコール
その他の混合物を冷却して潤滑剤として使用する
等の手段がとられている。 Therefore, conventionally, in order to prevent the surface of the fuel rod from being damaged, the plate spring portion 13a of the lantern spring 13 of the spacer 6 and the S-bend 10
a and 11a with a string to hold down the protruding part of the spring to enlarge the space into which the fuel rod is inserted, or to store the fuel rod at sub-zero temperatures to form a film of ice or frost on its surface. Alternatively, methods such as cooling a mixture of ice, alcohol, or other substances and using the mixture as a lubricant have been taken.
ところが、ばね部をひもで縛る方法は非常に煩
雑で時間を要し、また燃料棒の表面に氷等の被膜
を形成する場合には、燃料棒をあらかじめ氷点下
に保つておく必要があり、さらに潤滑剤を使用す
る場合には、燃料棒に不純物が付着して燃料棒の
性能が低下する恐れがあり、洗淨工程を設ける必
要がある等、いずれも作業工程が増え、組立てが
めんどうになる等の問題がある。 However, the method of tying the spring part with string is very complicated and time-consuming, and if a film of ice or other material is to be formed on the surface of the fuel rod, it is necessary to keep the fuel rod at sub-zero temperature beforehand. When lubricants are used, there is a risk that impurities may adhere to the fuel rods, reducing their performance, and a cleaning process is required, which increases the number of work steps and makes assembly more troublesome. There are other problems.
また、燃料棒にステンレスパイプを嵌装してス
ペーサのセル内に挿入する方法も考えられるが、
上記ステンレスパイプの肉厚を大きくすると、ラ
ンタンスプリング等を弾性限界以上に押し広げ、
燃料棒の弾性的保持を不可能とする恐れが大きく
なり、逆にステンレスパイプの肉厚を小さくする
と、パイプを抜き取る際に、ランタンスプリング
等による押圧力が働らいた状態で燃料棒表面とス
テンレスパイプ表面とが摺動するため、燃料棒表
面に傷が発生する可能性がある。また、ステンレ
スパイプの肉厚を薄くした場合には、パイプ先端
にキヤツプを溶接するなど補強を行ない、パイプ
先端が変形することを防ぐ必要がある。ところ
が、この場合にはパイプは燃料棒挿入方向にのみ
しか引き抜くことができず、例えば第１図に示し
たような、下部タイプレートの穴に燃料棒先端を
挿入していくような組立方法をとる必要のある燃
料集合体には適用できない等の問題がある。 Another option is to fit a stainless steel pipe onto the fuel rod and insert it into the spacer cell.
When the wall thickness of the stainless steel pipe mentioned above is increased, the lantern spring, etc. is pushed beyond its elastic limit, and
There is a greater risk that the fuel rods will not be able to be held elastically, and on the other hand, if the wall thickness of the stainless steel pipe is made small, when the pipe is removed, the surface of the fuel rod and the stainless steel Since the surface of the pipe slides, there is a possibility of scratches on the surface of the fuel rod. Furthermore, when the wall thickness of a stainless steel pipe is made thinner, it is necessary to perform reinforcement such as welding a cap to the tip of the pipe to prevent the tip from deforming. However, in this case, the pipe can only be pulled out in the direction in which the fuel rods are inserted.For example, as shown in Figure 1, it is difficult to assemble the pipes by inserting the tips of the fuel rods into the holes in the lower tie plate. There are problems such as it cannot be applied to fuel assemblies that need to be removed.
本発明はこのような点に鑑み、比較的簡単な方
法によつて、燃料棒の表面に傷が発生することを
確実に防止し得る核燃料集合体の組立および解体
方法を得ることを目的とする。
In view of the above, an object of the present invention is to provide a method for assembling and disassembling a nuclear fuel assembly that can reliably prevent the occurrence of scratches on the surface of fuel rods using a relatively simple method. .
本発明は、互いに格子状に配設されたバーおよ
びデイバイダー等によつて形成されたスペーサ
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が挿入され、各燃料
棒の間隔保持が行なわれるようにした核燃料集合
体の組立および解体方法において、軸線方向に所
定間隔をもつて配設された複数のスペーサの各セ
ルの内面および燃料棒の外面との間に、自己潤滑
性を有する材料によつて形成されほぼ燃料棒全長
にわたる長さを有する細長い円筒状フイルムを同
心状に介装した状態で、上記セル内への燃料棒の
挿入式は引き抜きを行なうようにしたことを特徴
とするものである。
In the present invention, fuel rods are inserted into cells each having at least one fuel rod pressing elastic member of a spacer formed of bars and dividers arranged in a lattice pattern, and each fuel rod is In a method for assembling and disassembling a nuclear fuel assembly in which spacing is maintained, self-lubricating is performed between the inner surface of each cell of a plurality of spacers arranged at predetermined intervals in the axial direction and the outer surface of a fuel rod. The fuel rod is inserted into and withdrawn from the cell with a long and thin cylindrical film made of a material having a magnetic property and having a length that spans almost the entire length of the fuel rod interposed concentrically. It is characterized by:
以下、第４図乃至第１４図を参照して本発明の
実施例について説明する。
Embodiments of the present invention will be described below with reference to FIGS. 4 to 14.
第４図において、符号２０は燃料棒のほぼ全長
にわたる長さの細長いポリエステル製の円筒状フ
イルムからなる治具であり、その治具２０の円筒
部２１には軸線方向に延びる切り割り２２が設け
られており、さらに一側端部には柄２３が設けら
れている。上記治具の円筒部２１は、自由な状態
においては、切り割り２２部において端縁部が互
いに重なり合い、断面渦巻状になつている。 In FIG. 4, reference numeral 20 is a jig made of an elongated cylindrical polyester film that spans almost the entire length of the fuel rod, and a slit 22 extending in the axial direction is provided in the cylindrical portion 21 of the jig 20. Furthermore, a handle 23 is provided at one end. In the free state, the cylindrical portion 21 of the jig has a spiral cross section with end edges overlapping each other at the cut 22 portion.
しかして、燃料集合体の組立に際しては、第５
図に示すように、直立動作可能なテーブル２４を
有する組立台２５を用い、テーブル２４を水平に
した状態で組立作業を行なう。 Therefore, when assembling the fuel assembly, the fifth
As shown in the figure, an assembly table 25 having a table 24 that can be operated upright is used, and the assembly work is performed with the table 24 held horizontally.
すなわち、上記テーブル２４の所定位置に装着
された取付具２６に下部タイプレート３および各
スペーサ６をそれぞれ取り付け、各スペーサ６の
同一軸線上にあるセル１２内に燃料棒挿入路に沿
つて前記治具２０の円筒部２１を挿入する。この
場合、上記治具２０の円筒部が渦巻状となつてい
るので、第６図に示すようにセル１２内に自由に
挿通することができる。そこで、上記円筒部２１
内にその一端から燃料棒４を挿入する。この状態
では第７図に示すように、燃料棒表面はフイルム
状の円筒部を介してＳベンド部１０ａ，１１ａ、
ランタンスプリング１３の板ばね部１３ａと接し
ている。 That is, the lower tie plate 3 and each spacer 6 are respectively attached to the fixture 26 mounted at a predetermined position on the table 24, and the fixing member is inserted into the cell 12 along the fuel rod insertion path on the same axis of each spacer 6. Insert the cylindrical portion 21 of the tool 20. In this case, since the cylindrical portion of the jig 20 has a spiral shape, it can be freely inserted into the cell 12 as shown in FIG. Therefore, the cylindrical portion 21
The fuel rod 4 is inserted into the interior from one end thereof. In this state, as shown in FIG.
It is in contact with the leaf spring portion 13a of the lantern spring 13.
このようにして燃料棒４の挿入操作が完了した
ら、その燃料棒４が軸方向に動かないように、第
８図に示すように、燃料棒４の端部をプツシヤ２
７で挿入方向に押えた状態にして、治具２０を柄
２３により挿入方向と逆方向に引き抜き、スペー
サ６から治具２０を除去する。なお、この場合治
具２０の円筒部２１には軸線方向の切り割り２２
が設けられているので、プツシヤ２７が燃料棒４
を押えた状態でも容易に治具２０の引き抜きを行
なうことができる。 When the insertion operation of the fuel rod 4 is completed in this way, the end of the fuel rod 4 is inserted into the pusher 2 as shown in FIG. 8 to prevent the fuel rod 4 from moving in the axial direction.
The jig 20 is held down in the insertion direction by the handle 23 and pulled out in the opposite direction to the insertion direction to remove the jig 20 from the spacer 6. In this case, the cylindrical portion 21 of the jig 20 has a cut 22 in the axial direction.
is provided, so that the pusher 27 is connected to the fuel rod 4.
The jig 20 can be easily pulled out even when the jig 20 is pressed down.
以下、同様にしてスペーサ６の各セル１２内に
順次燃料棒４を挿入して核燃料集合体の組立てを
行なう。 Thereafter, the fuel rods 4 are sequentially inserted into each cell 12 of the spacer 6 in the same manner to assemble a nuclear fuel assembly.
このように、燃料棒のスペーサへの挿入に際し
て自己潤滑性を有する材料からなる治具２０を使
用するので、スペーサのセル１２におけるＳベン
ド部１０ａ，１１ａ、ランタンスプリング１３の
板ばね部１３ａ等が治具２０の長円筒状のフイル
ムによつて覆われ、燃料棒４の外表面が直接板ば
ね部１３ａなどに摺接することがなく、燃料棒の
外表面に傷がつくことがない。 In this way, since the jig 20 made of a self-lubricating material is used when inserting the fuel rod into the spacer, the S-bend portions 10a and 11a in the spacer cell 12, the leaf spring portion 13a of the lantern spring 13, etc. Covered by the long cylindrical film of the jig 20, the outer surface of the fuel rod 4 does not come into direct sliding contact with the plate spring portion 13a, etc., and the outer surface of the fuel rod is not damaged.
また、核燃料集合体の解体に際しては、上記燃
料棒の挿入時とは逆に、引き抜こうとする燃料棒
とスペーサ６のセル内面との間に手作業によつて
治具の円筒部２１を挿入し、上記燃料棒をほぼそ
の全長にわたつて被覆した状態とし、その後上記
燃料棒のみ或は治具の円筒部２１とともに軸線方
向に移動させることによりスペーサから燃料棒を
引き抜く。この場合、ライタンスプリングの燃料
棒押圧力は数Kg以下であり、燃料棒表面とスプリ
ング、Ｓベント等は鋭角で接しているため、治具
の0.1mm厚程度のフイルムからなる円筒部は数百
ｇ程度の力で容易にスペーサと燃料棒間にさし込
むことができ、特別の器具等は必要としない。 In addition, when disassembling a nuclear fuel assembly, the cylindrical part 21 of the jig is manually inserted between the fuel rod to be extracted and the inner surface of the cell of the spacer 6, contrary to the insertion of the fuel rod described above. The fuel rod is coated over almost its entire length, and then the fuel rod is pulled out from the spacer by moving the fuel rod alone or together with the cylindrical portion 21 of the jig in the axial direction. In this case, the pressure force of the lightan spring on the fuel rod is less than a few kg, and the surface of the fuel rod and the spring, S-bent, etc. are in contact with each other at an acute angle, so the cylindrical part of the jig, which is made of a film about 0.1 mm thick, is several hundreds of kilograms. It can be easily inserted between the spacer and the fuel rods with a force of approximately 100 g, and no special equipment is required.
なお、燃料集合体の設計が、燃料棒を挿入した
後下部タイプレートを取付けられるようになつて
いる場合には、治具２０の円筒部２１の断面は第
６図等に示したもの以外に、第９図および第１０
図のように切り割りが設けられていないものも使
用することができる。すなわち、この場合には治
具２０の円筒部２１が薄いフイルムによつて形成
されていることを利用して、その円筒部２１を若
干変形させることにより、その円筒部２１をセル
内に容易に挿入することができ、上記セル内に挿
入された円筒部２１内に燃料棒を挿入する。そし
て、下部タイプレートの代りに燃料棒下部をチヤ
ツクして固定する治具を使用し、燃料棒挿入後燃
料棒の下端部をチヤツクした後、治具２０を挿入
方向と逆方向に引き抜くことができる。 If the design of the fuel assembly is such that the lower tie plate can be attached after inserting the fuel rods, the cross section of the cylindrical portion 21 of the jig 20 may be different from that shown in FIG. , Figures 9 and 10
It is also possible to use one without cutouts as shown in the figure. That is, in this case, by utilizing the fact that the cylindrical portion 21 of the jig 20 is formed of a thin film, the cylindrical portion 21 can be easily inserted into the cell by slightly deforming the cylindrical portion 21. A fuel rod is inserted into the cylindrical part 21 which can be inserted and inserted into the cell. Then, instead of the lower tie plate, a jig that chucks and fixes the lower part of the fuel rod is used, and after the fuel rod is inserted and the lower end of the fuel rod is chucked, the jig 20 can be pulled out in the opposite direction to the insertion direction. can.
さらに、第１１図、第１２図のように治具２０
の円筒部２１に軸線方向に延びる補強用の肉厚部
２１ａを設けてもよい。この場合上記肉厚部２１
ａはスペーサのセル内におけるＳベント１０ａ，
１１ａおよび板ばね部１３ａと接しないような位
置に設ける。 Furthermore, as shown in FIGS. 11 and 12, the jig 20
The cylindrical portion 21 may be provided with a reinforcing thick portion 21a extending in the axial direction. In this case, the thick portion 21
a is the S vent 10a in the spacer cell;
11a and the leaf spring portion 13a.
上記実施例においては、治具をスペーサの燃料
棒挿通路に沿つて挿入した後燃料棒を挿入するよ
うにしたものを示したが、上記治具の円筒部２１
をまず燃料棒４に嵌挿しその表面を被覆した後、
スペーサの所定のセル内に挿入するようにしても
よい。この場合治具２０の円筒部２１の先端部を
第１３図に示すようにすぼませたものとすること
が好ましい。 In the above embodiment, the fuel rods are inserted after the jig is inserted along the fuel rod insertion path of the spacer, but the cylindrical portion 21 of the jig is
After first inserting it into the fuel rod 4 and coating its surface,
It may also be inserted into a predetermined cell of the spacer. In this case, it is preferable that the tip of the cylindrical portion 21 of the jig 20 be constricted as shown in FIG.
また、第１２図に示すような形状の治具２０に
おいて、補強用肉厚部２１ａを円筒部２１の長さ
より延長させフツク部２１ｂを設け、第１４図に
示すように、燃料棒４の先端に装着したキヤツプ
２８に掛合させ、燃料棒４の挿入によつてキヤツ
プ２８およびフツク部２１ｂを介して治具２０を
引張る状態で同時に挿入し、上記キヤツプ２８を
挿入完了直前に燃料棒４から取り去り、その後第
１実施例と同様にして燃料棒の組立を行なうよう
にしてもよい。 Furthermore, in the jig 20 having the shape shown in FIG. 12, the reinforcing thick part 21a is extended beyond the length of the cylindrical part 21 to provide a hook part 21b, and as shown in FIG. When the fuel rod 4 is inserted, the jig 20 is simultaneously inserted while being pulled through the cap 28 and the hook portion 21b, and the cap 28 is removed from the fuel rod 4 just before the insertion is completed. Then, the fuel rods may be assembled in the same manner as in the first embodiment.
なお、上記各実施例においては、治具２０の円
筒部２１をポリエステルフイルムによつて形成し
たものを示したが、その他引張り強さが大きくか
つ破断伸びが小さく自己潤滑性を有する材料によ
つて構成してもよい。また、スペーサがランタン
スプリングを用いたものでなくても、格子状、蜂
の巣状等であり、燃料棒を押圧支持するための弾
性要素を有するスペーサを有する燃料集合体の組
立にも適用できる。 In each of the above embodiments, the cylindrical portion 21 of the jig 20 is made of polyester film, but it may also be made of other materials with high tensile strength, low elongation at break, and self-lubricating properties. may be configured. Further, even if the spacer does not use a lantern spring, it may be in the shape of a lattice, a honeycomb, etc., and can also be applied to the assembly of a fuel assembly having a spacer having an elastic element for press-supporting the fuel rods.
以上説明したように、本発明は軸線方向に所定
間隔をもつて配設された複数のスペーサの各セル
の内面および燃料棒の外面との間に、自己潤滑性
を有する材料によつて形成されほぼ燃料棒全長に
わたる長さを有する細長い円筒状フイルムを同心
状に介装した状態で上記セル内への燃料棒の挿説
を行なうようにしたので、ランタンスプリング等
による燃料棒外面への傷の発生を確実に防止する
ことができ、しかも１個の円筒状フイルムの使用
によつて、全てのスペーサの同一軸線上のセル内
面と燃料棒との直接摺接を防止でき、燃料集合体
の組立或は解体の工程もきわめて簡単で、複雑な
設備や工程を付加する必要もない等の効果を奏す
る。
As explained above, the present invention provides spacers formed of a self-lubricating material between the inner surface of each cell of a plurality of spacers arranged at predetermined intervals in the axial direction and the outer surface of the fuel rod. Since the fuel rod is inserted into the cell with a long and thin cylindrical film having a length that spans almost the entire length of the fuel rod interposed concentrically, there is no possibility of damage to the outer surface of the fuel rod due to lantern springs, etc. This can be reliably prevented from occurring, and by using one cylindrical film, it is possible to prevent direct sliding contact between the fuel rods and the inner surfaces of the cells on the same axis of all the spacers, making it possible to assemble the fuel assembly. In addition, the disassembly process is extremely simple, and there is no need to add complicated equipment or processes.
第１図は核燃料集合体の縦断面図、第２図はス
ペーサの拡大平面図、第３図は第２図の−線
に沿う断面側面図、第４図は治具の斜視図、第５
図は燃料集合体の組立状態説明図、第６図はスペ
ーサのセル内に治具を挿入した状態を示す平断面
図、第７図は上記セル内の治具に燃料棒を挿入し
た状態を示す平断面図、第８図は燃料棒挿入後治
具の引き抜き状態を示す部分斜視図、第９図乃至
第１２図はそれぞれ治具の他の実施例を示す横断
面図、第１３図および第１４図はそれぞれ治具の
他の実施例を示す斜視図および縦断部分図であ
る。
４……燃料棒、６……スペーサ、１２……セ
ル、１３……ランタンスプリング、２０……治
具、２１……円筒部、２２……切り割り、２３…
…柄、２７……プツシヤ。
Fig. 1 is a vertical sectional view of the nuclear fuel assembly, Fig. 2 is an enlarged plan view of the spacer, Fig. 3 is a sectional side view taken along the - line in Fig. 2, Fig. 4 is a perspective view of the jig, Fig. 5
The figure is an explanatory diagram of the assembled state of the fuel assembly, Figure 6 is a plan sectional view showing the state in which the jig is inserted into the cell of the spacer, and Figure 7 is the state in which the fuel rod is inserted into the jig in the cell. FIG. 8 is a partial perspective view showing a state in which the jig is pulled out after fuel rod insertion, and FIGS. 9 to 12 are cross-sectional views showing other embodiments of the jig, and FIG. 13 and FIG. FIG. 14 is a perspective view and a longitudinal partial view showing another embodiment of the jig, respectively. 4...Fuel rod, 6...Spacer, 12...Cell, 13...Lantern spring, 20...Jig, 21...Cylindrical portion, 22...Cut, 23...
...Handle, 27...Putsiya.
Claims (1)
圧用弾性部材を有する複数のセル内にそれぞれ燃
料棒が挿入され、各燃料棒の間隔保持が行なわれ
るようにした核燃料集合体の組立および解体方法
において、軸線方向に所定間隔をもつて配設され
た複数のスペーサの各セルの内面および燃料棒の
外面との間に、自己潤滑性を有する材料によつて
形成されほぼ燃料棒全長にわたる長さを有する細
長い円筒状フイルムを同心状に介装した状態で、
上記セル内への燃料棒の挿入或は引き抜きを行な
うようにしたことを特徴とする、核燃料集合体の
組立および解体方法。 ２ 複数のスペーサの同一軸線上にある全セルに
わたつてそのセル内に円筒状フイルムを挿入した
後、燃料棒の挿入或は引き抜きを行なうことを特
徴とする、特許請求の範囲第１項記載の核燃料集
合体の組立および解体方法。 ３ 燃料棒に円筒状フイルムを外嵌させた状態
で、上記燃料棒のセル内への挿入或は引き抜きを
行なうことを特徴とする、特許請求の範囲第１項
記載の核燃料集合体の組立および解体方法。 ４ 円筒状フイルムはポリエステルフイルムであ
ることを特徴とする、特許請求の範囲第１項記載
の核燃料集合体の組立および解体方法。 ５ 円筒状フイルムは、軸方向全長にわたり切り
割りを有することを特徴とする、特許請求の範囲
第１項記載の核燃料集合体の組立および解体方
法。 ６ 燃料棒先端に着脱可能なキヤツプを装着し、
そのキヤツプに円筒状フイルムの先端を係合させ
て、セル内への燃料棒の挿入を行なうことを特徴
とする、特許請求の範囲第１項記載の核燃料集合
体の組立および解体方法。[Scope of Claims] 1. Assembly of a nuclear fuel assembly in which fuel rods are inserted into each of a plurality of cells having at least one fuel rod pressing elastic member in a spacer, and the spacing of each fuel rod is maintained; and In the dismantling method, a plurality of spacers arranged at predetermined intervals in the axial direction are formed between the inner surface of each cell and the outer surface of the fuel rod, and are made of a self-lubricating material and span almost the entire length of the fuel rod. With a long and thin cylindrical film interposed concentrically,
A method for assembling and disassembling a nuclear fuel assembly, characterized in that the fuel rods are inserted into or withdrawn from the cells. 2. Claim 1, characterized in that the fuel rods are inserted or withdrawn after a cylindrical film is inserted into all the cells on the same axis of the plurality of spacers. method for assembling and disassembling nuclear fuel assemblies. 3. Assembly of a nuclear fuel assembly according to claim 1, characterized in that the fuel rod is inserted into or withdrawn from the cell with a cylindrical film fitted around the fuel rod; and Disassembly method. 4. The method for assembling and disassembling a nuclear fuel assembly according to claim 1, wherein the cylindrical film is a polyester film. 5. The method for assembling and disassembling a nuclear fuel assembly according to claim 1, wherein the cylindrical film has a cut along the entire length in the axial direction. 6 Attach a removable cap to the tip of the fuel rod,
The method for assembling and disassembling a nuclear fuel assembly according to claim 1, characterized in that the fuel rod is inserted into the cell by engaging the tip of the cylindrical film with the cap.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59037982A JPS60181680A (en) | 1984-02-29 | 1984-02-29 | Method of assembling and overhauling nuclear fuel aggregate |
| US06/706,342 US4740351A (en) | 1984-02-29 | 1985-02-27 | Method of and arrangement for protecting nuclear fuel assembly |
| FR8502867A FR2560423B1 (en) | 1984-02-29 | 1985-02-27 | METHOD AND DEVICE FOR PROTECTING NUCLEAR FUEL ASSEMBLIES |
| DE19853506951 DE3506951A1 (en) | 1984-02-29 | 1985-02-27 | METHOD AND DEVICE FOR ASSEMBLING A FUEL ELEMENT BUNDLE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59037982A JPS60181680A (en) | 1984-02-29 | 1984-02-29 | Method of assembling and overhauling nuclear fuel aggregate |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2415973A Division JPH03248096A (en) | 1990-12-28 | 1990-12-28 | Assembling and disassembling method for fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60181680A JPS60181680A (en) | 1985-09-17 |
| JPH028678B2 true JPH028678B2 (en) | 1990-02-26 |
Family
ID=12512769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59037982A Granted JPS60181680A (en) | 1984-02-29 | 1984-02-29 | Method of assembling and overhauling nuclear fuel aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60181680A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4800061A (en) * | 1987-05-06 | 1989-01-24 | Westinghouse Electric Corp. | Apparatus for loading fuel rods into grids of nuclear fuel assemblies |
| JP2527786B2 (en) * | 1988-05-09 | 1996-08-28 | 三菱原子燃料株式会社 | Assembling method of nuclear fuel assembly |
| JPH083553B2 (en) * | 1988-11-29 | 1996-01-17 | 三菱原子燃料株式会社 | Assembly method and apparatus for fuel assembly |
| JPH03248096A (en) * | 1990-12-28 | 1991-11-06 | Japan Nuclear Fuel Co Ltd<Jnf> | Assembling and disassembling method for fuel assembly |
-
1984
- 1984-02-29 JP JP59037982A patent/JPS60181680A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60181680A (en) | 1985-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |