JP2923603B2 - Synthetic resin clearance gauge for inspection of nuclear fuel assemblies - Google Patents
Synthetic resin clearance gauge for inspection of nuclear fuel assembliesInfo
- Publication number
- JP2923603B2 JP2923603B2 JP6200187A JP20018794A JP2923603B2 JP 2923603 B2 JP2923603 B2 JP 2923603B2 JP 6200187 A JP6200187 A JP 6200187A JP 20018794 A JP20018794 A JP 20018794A JP 2923603 B2 JP2923603 B2 JP 2923603B2
- Authority
- JP
- Japan
- Prior art keywords
- gap
- gauge
- short
- base end
- curved
- 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 - Fee Related
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
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、太径水管を有する原子
燃料集合体の燃料棒間や燃料棒と太径水管間など、比較
的硬度が小さく、傷の付き易い検査対象物間における隙
間であって、しかも見通しのきかない箇所に存する隙間
につき、その間隙が正規の間隙基準値に形成されている
か否かを検知するのに好適な合成樹脂製隙間ゲージに関
する。BACKGROUND OF THE INVENTION The present invention relates to a gap between relatively low hardness and easily scratched inspection objects such as between fuel rods of a nuclear fuel assembly having a large diameter water pipe or between a fuel rod and a large diameter water pipe.
Be between, yet forecast Shinokika per gap <br/> existing in no position, of a preferred synthetic resin feeler gauge to detect whether the gap is formed in the gap reference value of the normal .
【０００２】[0002]
【従来の技術】既知の如く原子燃料集合体は、多数本の
燃料棒や単数あるいは複数本の水管を、所定寸法の間隙
だけ離して引揃えの状態に配列した構成を有しており、
これらの間隙長は原子燃料集合体の性能上、極めて重要
な要素となってくることから、これが予め定められた間
隙基準値に合致しているか否かの確認検査が、必ず行わ
れることになっている。BACKGROUND ART Known as nuclear fuel assemblies, a large number of fuel rods and one or a plurality of water tubes of, has a structure arranged in the state of e引揃apart by a gap of predetermined dimension,
Since these gap lengths are a very important factor in the performance of the nuclear fuel assembly, it is necessary to check whether or not these gaps meet the predetermined gap reference values. Has become.
【０００３】これまでの原子燃料集合体にあっては、多
数の燃料棒やこれと同径に形成された複数の水管相互の
隙間が、外側から見通すことのできる間隙長となるよう
配列されており、従って、見通し方向への方位にあっ
て、夫々原子燃料集合体により定められた間隙基準値に
形成の隙間ゲージを、外側から直進状態で挿入するよう
にすればよく、このために、鋼製の隙間ゲージも使用さ
れていた。In a conventional nuclear fuel assembly, a large number of fuel rods and a plurality of water pipes having the same diameter are formed .
The gaps are arranged so as to have a gap length that can be seen from the outside.Therefore, in the azimuth in the line-of-sight direction, the gap gauges formed at the gap reference values determined by the respective nuclear fuel assemblies are arranged on the outside. It is sufficient to insert the device in a straight line from above, and for this purpose, a steel clearance gauge has also been used.
【０００４】しかし、燃料棒や水管は、ジルコニウム合
金などの比較的硬度が小さく傷が付き易い素材で形成さ
れているため、鋼製の隙間ゲージを用いるよりも、アク
リル樹脂などの非金属性材料のものが既に多用されてい
る。ところが、近年燃料性能の向上を目的とした新設計
の原子燃料集合体にあっては、図４によって例示されて
いる通り、太径水管ａが燃料棒ｂよりも大径に形成され
るようになっているため、燃料棒ｂ相互間に形成される
隙間ｇ１ は、外側から見通し方向に列装されている
が、太径水管ａと、これに隣装された燃料棒ｂとの隙間
ｇ２ は、外側からの見通し方向にない構成となってい
る。However, since fuel rods and water pipes are made of a material such as zirconium alloy which has relatively low hardness and is easily scratched, a non-metallic material such as acrylic resin is used rather than a steel gap gauge. Is already heavily used. However, in the improvement of recent fuel performance nuclear fuel assembly of a new design for the purpose, as illustrated by FIG. 4, as a large diameter water pipe a is formed with a larger diameter than the fuel rods b Is formed between the fuel rods b.
Gap g 1 has been RetsuSo from the outside perspective direction, and the large-diameter water pipes a, a gap g 2 between the fuel rods b this to the TonariSo is a configuration without the prospect direction from the outer I have.
【０００５】従って、見通し方向にある隙間ｇ１ の検
査は、これまでの隙間ゲージで検査できるものの、見通
し方向にない隙間ｇ２ の検査は不能となる。すなわ
ち、上記隙間ｇ１ 、ｇ２ は自らその間隙長も相違す
るが、何れも数ｍｍ程度の寸法となることから、鋼製の
隙間ゲージでは、隙間ｇ１ に通すことができても、こ
れを弯曲させて隙間ｇ２ まで進入させて行くことがで
きず、前記の如くアクリル樹脂などの隙間ゲージを用い
た場合にあっても、柔軟性が充分でないため、隙間ｇ２
の検査は困難であり、無理に使用すれば、切損が生じ
て原子燃料集合体の内部に、破損断片が残留する虞れも
生ずる。Accordingly, the inspection gap g 1 on the sight direction, but can be inspected in the previous feeler gauge, inspection is not in sight direction gap g 2 becomes impossible. That is, although the gaps g 1 and g 2 have different gap lengths by themselves, each has a dimension of about several mm. Therefore, even if the gap g 1 made of steel can pass through the gap g 1 , since the by curved can not go is advanced to the gap g 2, even in the case of using the feeler gauge such as acrylic resins as, is not a sufficient flexibility, the gap g 2
Inspection is difficult, and if used forcibly, there is a risk that cuts will occur and damaged fragments will remain inside the nuclear fuel assembly.
【０００６】そこで、隙間ゲージの素材にポリエチレン
の如く軟質な合成樹脂を用いることも考えられるが、こ
のようにすれば検査すべき隙間ｇ２ までの進入は可能
となっても、隙間ゲージが検査時に歪んで変形すること
となるから、所定の間隙基準値であるか否かの判定に対
する信頼性が低下することになる。[0006] Therefore, it is considered to use a soft synthetic resin as polyethylene feeler gauge of the material, even when this approach to the gap g 2 to be examined if the is possible, a clearance gauge inspection Since it is sometimes distorted and deformed, the reliability of the determination as to whether or not it is a predetermined gap reference value is reduced.
【０００７】[0007]
【発明が解決しようとする課題】本発明は上記従来の技
術に鑑み、請求項１にあっては、その製品素材に合成樹
脂材を用いるのであるが、ポリアセタール樹脂のよう
に、その硬度と繰り返しの弯曲に対する強度について適
切に選定すると共に、単に均一厚の隙間ゲージとするの
でなく、見通し方向にない燃料棒と太径水管との隙間に
係る間隙基準値の厚さに形成した短尺ゲージ部を先端に
形成し、これに連設した長尺連結部は、当該短尺ゲージ
部よりも肉薄に形成することで、燃料棒や太径水管に対
する損傷の虞れを完全に解消すると共に、上記の見通し
方向にない隙間に至るまでの曲成経路に沿って、長尺連
結部の弯曲に基づく進入を可能とし、信頼性の高い検査
を容易かつ迅速に行い得るようにするのが、その目的で
ある。SUMMARY OF THE INVENTION In view of the above-mentioned prior art, the present invention uses a synthetic resin material for the product material according to the first aspect of the present invention. of suitable <br/> while earnestly selected for strength against curved, rather than simply a uniform thickness of the feeler gauge into the gap and not the fuel rods and thickness径水tube sight direction
Short gauge portion formed in the thickness of the gap reference value to form the tip of, the elongate connecting portion which is provided continuously thereto, by forming thinner than the short gauge portion, for the fuel rods and a large diameter water pipe while completely eliminating the possibility of damage, along the tracks formed route to a gap not to the outlook direction, to allow the entry based on the curvature of the elongated connecting portion, and facilitating highly reliable test Its purpose is to be able to do it quickly.
【０００８】請求項２にあっては、請求項１の如く構成
された少なくとも一対の間隙ゲージ片を離間して、操作
用基端部より一平面内にあって併設することで、請求項
１の目的に加えて操作用基端部により使い勝手をよくす
ると共に、一回の挿入による検査によって、その検査部
位が拡大されるようにし、これにより、検査の作業効率
を向上させようとしている。According to a second aspect of the present invention, at least a pair of gap gauge pieces configured as in the first aspect are separated from each other, and are provided in one plane from the base end portion for operation. In addition to the object of (1), the usability is improved by the operation base end portion, and the inspection part is enlarged by the inspection by one insertion, thereby improving the work efficiency of the inspection.
【０００９】請求項３では、操作用基端部の中央から、
請求項２と同じ間隙ゲージ片を所要数延設すると共に、
その両側からは一対の非弯曲間隙ゲージ片を一平面内に
て併装延設することで、検査に際しての一挿入操作によ
って、見通し方向における間隙と見通し方向にない間隙
との双方を検査できるようにすると共に、当該挿入操作
によって非弯曲間隙ゲージ片が見通し方向における間隙
に挟持されることで、間隙ゲージ片の長尺連結部が、不
本意に捩れたり屈曲されてしまうことを防止して、その
耐久性を向上しようとしている。According to the third aspect, from the center of the operation base end portion,
While the required number of the same gap gauge pieces as in claim 2 are extended,
From both sides, a pair of non-curved gap gauge pieces are installed and extended in one plane so that both the gap in the line of sight and the gap not in the line of sight can be inspected by one insertion operation at the time of inspection. In addition, the insertion operation causes the non-curved gap gauge piece to be sandwiched in the gap in the line-of-sight direction, thereby preventing the long connecting portion of the gap gauge piece from being unintentionally twisted or bent, They are trying to improve their durability.
【００１０】[0010]
【課題を解決するための手段】本発明は上記の目的を達
成するため、請求項１にあっては、原子燃料集合体の燃
料棒や太径水管に傷を付けない程度の硬質性と、繰り返
しの弯曲使用に耐えるポリアセタール等の合成樹脂製で
あって、先端には前記燃料棒と太径水管との見通し方向
にない隙間に係る間隙基準値の厚さをもった短尺ゲージ
部が形成され、この短尺ゲージ部の基端からは、当該短
尺ゲージ部よりも肉薄に形成して可撓性をもたせた弯曲
自在な長尺連結部が、長手方向に延設されていることを
特徴とする原子燃料集合体の検査用合成樹脂製隙間ゲー
ジを提供しようとしている。In order to achieve the above object, according to the present invention, there is provided a fuel assembly for a nuclear fuel assembly.
It is made of a synthetic resin such as polyacetal that is hard enough not to damage the fuel rod and large-diameter water pipe, and withstands repeated bending, and has a gap at the tip that is not in the line of sight between the fuel rod and the large-diameter water pipe. is short gauge portion having a thickness of the gap reference values formed according to, from the proximal end of the short gauge portion, curved freely elongated remembering flexible and formed thinner than the short gauge portion It is an object of the present invention to provide a synthetic resin gap gauge for inspection of a nuclear fuel assembly , wherein the connecting portion is extended in a longitudinal direction.
【００１１】請求項２では操作用基端部の一側端から
は、互いに巾方向へ離間して、複数の間隙ゲージ片が、
前方へ向けて略併行等長となるよう一平面内に突設さ
れ、この間隙ゲージ片は、何れも原子燃料集合体の燃料
棒や太径水管に傷を付けない程度の硬質性と、繰り返し
の弯曲使用に耐えるポリアセタール等の合成樹脂製であ
って、先端には前記燃料棒と太径水管との見通し方向に
ない隙間に係る間隙基準値の厚さをもった短尺ゲージ部
が形成され、この短尺ゲージ部の基端からは、当該短尺
ゲージ部よりも肉薄に形成して可撓性をもたせた弯曲自
在な長尺連結部が、前記操作用基端部まで長手方向に延
設されていることを内容としている。According to the second aspect, a plurality of gap gauge pieces are spaced apart from one side end of the operation base end in the width direction.
Is projected in one plane so as to be substantially parallel equal length toward the front, the fuel of the gap gauge strips are all nuclear fuel assemblies
It is made of synthetic resin such as polyacetal which is hard enough not to damage rods and large diameter water pipes , and which can withstand repeated bending, and has a gap at the tip that is not in the line of sight between the fuel rod and large diameter water pipe. is short gauge portion having a thickness of the gap reference value according formation, from the base end of the short gauge portion, curved freely elongate connecting remembering flexibility and formed thinner than the short gauge portion The portion extends in the longitudinal direction to the operation base end portion.
【００１２】請求項３の場合には、操作用基端部の一側
端からは、互いに巾方向へ離間して、一対の非弯曲間隙
ゲージ片が、前方へ向けて略併行等長となるよう一平面
内に突設されると共に、当該各非弯曲間隙ゲージ片の間
には、上記操作用基端部から所要数の間隙ゲージ片が、
スリットを隔てて、略同一平面内で併行に突設され、こ
れらの非弯曲間隙ゲージ片と間隙ゲージ片は、何れも原
子燃料集合体の燃料棒や太径水管に傷を付けない程度の
硬質性と繰り返しの弯曲使用に耐えるポリアセタール等
の合成樹脂製であって、各非弯曲間隙ゲージ片は何れ
も、前記燃料棒と太径水管との見通し方向の隙間に係る
間隙基準値の厚さをもって形成され、間隙ゲージ片は、
先端に前記燃料棒と太径水管との見通し方向にない隙間
に係る間隙基準値の厚さをもった短尺ゲージ部が上記非
弯曲間隙ゲージ片の先端部から延出する長さにて形成さ
れ、かつ、当該短尺ゲージ部よりも肉薄に形成して可撓
性をもたせた弯曲自在な長尺連結部が、前記操作用基端
部まで長手方向に延設され、前記非弯曲間隙ゲージ片の
厚さが、上記間隙ゲージ片における短尺ゲージ部の厚さ
よりも大であることを特徴としている。In the case of the third aspect, the pair of non-curved gap gauge pieces are separated from each other in the width direction from one side end of the operation base end portion, and have substantially the same length in the forward direction. A predetermined number of gap gauge pieces are protruded in one plane and between the non-curved gap gauge pieces, from the base end for operation,
At a slit, protruding from the parallel in substantially the same plane, these non-curved gap gauge strip and gap gauge pieces are all original
Polyacetal, etc. that is hard enough not to damage the fuel rods and large-diameter water pipes of the child fuel assembly and that can withstand repeated use
Which is made of synthetic resin, any each non curved gap gauge strip is formed with a thickness of <br/> gap reference value according to the expected direction of the gap between the fuel rod and thickness径水tube, the gap gage pieces Is
A gap that is not in the line of sight between the fuel rod and the large diameter water pipe at the tip
It is formed by a length extending short gauge portion having a thickness of the gap reference values from the distal end of the non-curved gap gauge strips according to, and flexible to form thinner than the short gauge portion A flexible long connecting portion with a property is extended in the longitudinal direction to the operation base end portion, and the thickness of the non-curved gap gauge piece is larger than the thickness of the short gauge portion in the gap gauge piece. It is characterized by being large.
【００１３】[0013]
【作用】本発明の請求項１に係る非金属性隙間ゲージに
よるときは、検査のための検査対象物である原子燃料集
合体に対する挿入操作によって、もちろん短尺ゲージ部
は見通し方向にある隙間を通過して行き、当該隙間から
見通し方向にない隙間までの経路が曲成されていても、
肉薄に形成された長尺連結部は、可成りの角度（±６０
°程度）で弯曲可能であるため、短尺ゲージ部は上記の
見通し方向にない隙間まで進入して行き、当該隙間が間
隙基準値を満足しているか否かの検査を行うことができ
る。また、その素材に合成樹脂を用いるが、ポリアセタ
ールなどの燃料棒や太径水管検査対象物に傷を付けない
硬質性と、繰り返しの弯曲使用に耐えるものを選定する
ことで、検査の信頼性と耐久性を向上できることにな
る。When the non-metallic clearance gauge according to claim 1 of the present invention is used , the nuclear fuel collection which is an inspection object for inspection is performed.
The insert operation against coalescence, of course short gauge portion went through a gap in the expected direction, also the path from the gap to a gap not in sight direction have been bent,
The long connecting portion formed thinly has a considerable angle (± 60
Since in ° C.) can be curved, short gauge portion went enters to the gap without the above forecast direction can be performed whether the test the gap satisfies the gap reference value. In addition, although synthetic resin is used for the material, the rigidity that does not damage fuel rods such as polyacetal and large-diameter water pipe inspection objects, and those that can withstand repeated use of bending are selected to improve the reliability of inspection. The durability can be improved.
【００１４】請求項２にあっては、検査のための挿入操
作に際して、操作用基端部を把持できるので操作性がよ
く、当該操作用基端部から、複数の請求項１に係る間隙
ゲージ片が併設されていることから、一回の挿入操作に
よって、複数箇所の見通し方向にない隙間につき検査を
行うことができ、原子燃料集合体の検査作業時間と労力
を、夫々大巾に短縮、軽減することが可能となる。According to the second aspect of the present invention, the insertion operation for the inspection can be performed by gripping the operation base end portion, so that the operability is good. Since the pieces are installed side by side, a single insertion operation allows inspection of gaps that are not in the line-of-sight direction at multiple locations, greatly shortening the inspection work time and labor for nuclear fuel assemblies, It becomes possible to reduce.
【００１５】請求項３の場合には、請求項２と同じく操
作用基端部を有し、これには少なくとも一つの間隙ゲー
ジ片が延設されていると共に、その巾方向両側に、見通
し方向における隙間を検査することのできる非弯曲間隙
ゲージ片をも併装延設してあるから、検査のための挿入
操作により、非弯曲間隙ゲージ片により、原子燃料集合
体の二箇所につき隙間の検査ができることとなる。ま
た、間隙ゲージ片の長尺連結部は肉薄であるが、非弯曲
間隙ゲージ片によって、見通し方向における隙間への進
入が案内されることとなり、従って、当該間隙ゲージ片
が当該検査対象物に対して不本意に衝当し、このため肉
薄の長尺連結部が座屈するといったことが防止され、か
つ、当該長尺連結部が適度に曲成することで、見通し方
向にない隙間まで、短尺ゲージ部を円滑に進入させ、そ
の検査を高い信頼性をもって実施することができる。In the case of the third aspect, as in the case of the second aspect, there is provided an operation base end portion, at least one gap gauge piece is extended, and both sides in the width direction are provided in the line-of-sight direction. because are then併装extends also non curved gap gauge strip that can inspect the gap, the insertion operation for the test, the non-curved gap gauge strip in atomic fuel assembly
Inspection of the gap can be performed at two places on the body . Although the elongated connecting portion of the gap gauge strip is thin, the non-curved gap gauge strip, it is possible to enter into the gap is guided in the sight direction, therefore, the gap gage pieces to the inspection object Inadvertently colliding with each other to prevent the thin long connecting portion from buckling, and the long connecting portion is appropriately bent, so that a short gauge can be extended to a gap not in the line of sight. The inspection can be performed with high reliability by smoothly entering the part.
【００１６】[0016]
【実施例】本発明につき図１乃至図３による実施例によ
り、これを詳記すると、請求項１にあっては、図１の
（Ａ）に明示するように、その素材として合成樹脂を用
いるが、これには、燃料棒、太径水管に傷を付けること
のない程度の硬質性を有し、かつ、繰り返しの使用によ
り弯曲させても、これに耐えることのできるものを採択
するのであり、これにはポリアセタール樹脂が最適であ
った。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 3. In the first embodiment, as shown in FIG. 1A, a synthetic resin is used as the material. but the this, the fuel rods have the free degree of the hard scratch the large diameter water pipe, and also be curved by the use of repetition, it is to adopt those which can withstand this , Po Li acetal resin was optimal for this.
【００１７】先端の短尺ゲージ部１と、その長手方向へ
連設した長尺連結部２とからなっており、当該短尺ゲー
ジ部１は原子燃料集合体Ｔなどの検査対象物Ｔにあっ
て、燃料棒と太径水管との隙間、すなわち外側から見通
し方向にない隙間ｇに係る間隙基準値の厚さに形成さ
れ、この短尺ゲージ部１の長手方向における基端１ａの
下部から、当該短尺ゲージ部１よりも肉薄に形成するこ
とで可撓性をもたせ、これにより、弯曲自在な前記の長
尺連結部２が長手方向へ延設されている。A short gauge portion 1 at the tip and a long connecting portion 2 connected in the longitudinal direction thereof are provided. The short gauge portion 1 is located on an inspection object T such as a nuclear fuel assembly T , the gap between the fuel rod and the large-diameter water pipe, that is, a thickness of the gap reference value according to the no-sight direction gap g from the outside, from the bottom of the base end 1a in the longitudinal direction of the short gauge portion 1, the short gauge By forming it thinner than the part 1, it has flexibility, whereby the long connecting part 2, which can be bent, extends in the longitudinal direction.
【００１８】そして、図示例にあっては、間隙基準値に
形成された短尺ゲージ部１の下面部１ｂと、長尺連結部
２の下面部２ａとは面一の状態に形成され、当該長尺連
結部２の上面部２ｂと、短尺ゲージ部１の上面部１ｃと
が、凹弧面部１ｄを介して段落状に連設され、さらに上
記の上面部１ｃと下面部１ｂの先端側が、凸弧面部１ｅ
によって連設されている。In the illustrated example, the lower surface portion 1b of the short gauge portion 1 formed at the gap reference value and the lower surface portion 2a of the long connecting portion 2 are formed flush with each other. The upper surface portion 2b of the length connecting portion 2 and the upper surface portion 1c of the short gauge portion 1 are connected in a paragraph-like manner via a concave arc surface portion 1d, and the top surfaces of the upper surface portion 1c and the lower surface portion 1b are convex. Arc surface 1e
It is continuously established by.
【００１９】従って、上記の合成樹脂製である隙間ゲー
ジを用いて、見通し方向にない隙間ｇにつき検査しよう
とするときは、図１の（Ｂ）に示されているように、短
尺ゲージ部１を先行させて、外側から原子燃料集合体の
燃料棒相互の隙間である見通し方向における隙間Ｇより
挿入して行くのであり、これにより、短尺ゲージ部１
が、燃料棒とか太径水管等に当接するに至っても、さら
に当該挿入操作を続ければ、長尺連結部２は肉薄に形成
されているため、これが弯曲自在であり、当該変形によ
って短尺ゲージ部１が、見通し方向にない隙間ｇへと進
入して行き、このときの進入状態によって、太径水管と
燃料棒との見通し方向にない隙間ｇが、所定の間隙基準
値を満足しているか否かにつき検査することができる。Therefore, when the gap g which is not in the line-of-sight direction is to be inspected using the gap gauge made of the above synthetic resin , as shown in FIG. Is inserted from the outside through the gap G in the line of sight, which is the gap between the fuel rods of the nuclear fuel assembly, from the outside.
But also come to abut against the fuel rods Toka large diameter water pipes or the like, if further Continuing the insertion operation, since the elongated connecting portion 2 is formed in a thin, which is freely curved, short gauge portion by the deformation 1, continue to enter into a no-sight direction gap g, by entering the state at this time, and thickness径水tube
It can be checked whether the gap g not in the line of sight with the fuel rod satisfies a predetermined gap reference value.
【００２０】次に請求項２につき、図２の実施例によっ
てこれを詳記すると、操作用基端部３の一側端３′か
ら、互いに、その巾方向へ所定距離だけ離して、複数の
間隙ゲージ片４が前方へ向けて略併行等長となるよう一
平面内に突設されており、図示例の間隙ゲージ片４は一
対だけ設けられており、これらの間隙ゲージ片４が、前
記の請求項１に係る合成樹脂製隙間ゲージによって形成
されたものである。Referring to FIG. 2, this will be described in more detail with reference to FIG. 2. From one side end 3 'of the operation base end portion 3, a plurality of members are separated from each other by a predetermined distance in the width direction thereof. The gap gauge pieces 4 are projected in one plane so as to be substantially parallel to each other in the forward direction, and only one pair of the gap gauge pieces 4 in the illustrated example is provided. It is formed by the synthetic resin gap gauge according to claim 1.
【００２１】すなわち、上記の間隙ゲージ片４は、何れ
もポリアセタール等の太径水管や燃料棒に傷を付けない
程度の硬質性と、繰り返しの弯曲使用に耐える合成樹脂
製であって、先端には原子燃料集合体Ｔの燃料棒と太径
水管との見通し方向にない隙間に係る間隙基準値の厚さ
をもった短尺ゲージ部１が形成され、この短尺ゲージ部
１の基端１ａからは、当該短尺ゲージ部１よりも肉薄に
形成して可撓性をもたせた弯曲自在な長尺連結部２が、
前記操作用基端部３まで長手方向に延設されているので
ある。That is, each of the gap gauge pieces 4 is made of a synthetic resin which is hard enough not to damage a large diameter water pipe such as polyacetal or a fuel rod , and which withstands repeated bending use. Is the fuel rod and the large diameter of the nuclear fuel assembly T
A short gauge portion 1 having a thickness of a gap reference value related to a gap not in the line of sight with the water pipe is formed. From the base end 1a of the short gauge portion 1, the thin gauge portion 1 is formed to be thinner than the short gauge portion 1. The flexible long connecting part 2 with flexibility
It extends in the longitudinal direction to the operation base end 3.
【００２２】上記操作用基端部３と、間隙ゲージ片４と
の連設構成は、任意のものであってよいが、図示例では
図２（Ｂ）に明示の如く操作用基端部３が、挟持上部３
ａと挟持下部３ｂおよび締着ボルト３ｃとナット３ｄと
からなり、間隙ゲージ片４を、挟持上部３ａと挟持下部
３ｂとによって挟持した状態で、これらに貫装した締着
ボルト３ｃに、ナット３ｄを螺着するようにしている。The connecting structure between the operation base end portion 3 and the gap gauge piece 4 may be arbitrary, but in the illustrated example,
As shown in FIG. 2 (B), the operation base end 3 is
a, a clamping lower part 3b, a fastening bolt 3c, and a nut 3d. The gap gauge piece 4 is clamped by the clamping upper part 3a and the clamping lower part 3b. Is screwed on.
【００２３】従って、上記の場合には、操作用基端部３
を摘むようにして、所要複数の間隙ゲージ片４を、前記
の請求項１につき説示したように原子燃料集合体Ｔに挿
入すれば、当該一度の挿入操作によって、燃料棒と太径
水管との間における見通し方向にない隙間ｇにつき、そ
の長手方向における所望複数箇所の検査を行うことがで
きる。Therefore, in the above case, the operation base end 3
When the required plurality of gap gauge pieces 4 are inserted into the nuclear fuel assembly T as described in claim 1, the fuel rod and the large-diameter water pipe can be inserted by the single insertion operation. The inspection at a plurality of desired locations in the longitudinal direction can be performed for the gap g that is not in the line-of-sight direction.
【００２４】次に、図３によって請求項３に係る合成樹
脂製隙間ゲージにつき詳記すると、これまた請求項２の
ものと同様にして操作用基端部３を有し、その一側端
３′からは、互いに、その巾方向へ大きく離間して、一
対の非弯曲間隙ゲージ片５が、前方へ向けて略併行等長
となるよう同一平面内に突設されており、この際、請求
項２の場合も同じであるが、これらは基板部５ａを介し
て一体に形成するようにしてもよく、また、図示例では
非弯曲間隙ゲージ片５を、一個宛で一対としているが、
二個宛の一対とか、一個と二個で一対にするなど任意
に、その各数は選定可能である。Next, referring to FIG. 3, a synthetic tree according to claim 3 will be described.
More specifically, the grease gap gauge has an operation base end 3 in the same manner as that of the second aspect, and is largely separated from one side end 3 ′ in the width direction thereof. A pair of non-curved gap gauge pieces 5 are protruded in the same plane so as to be substantially parallel to each other in a forward direction. May be formed integrally through the base member, and in the illustrated example, the non-curved gap gauge pieces 5 are paired one by one.
Each number can be selected arbitrarily, such as a pair of two or a pair of one and two.
【００２５】さらに、上記の各非弯曲間隙ゲージ片５の
間には、上記操作用基端部３から所要数の間隙ゲージ片
４が、スリット６を隔てて、非弯曲間隙ゲージ片５と略
同一平面内で併行に突設されており、この際図示例で
は、当該間隙ゲージ片４が、上記一対の非弯曲間隙ゲー
ジ片５と一体に、前記の基板部５ａから、連設部４ａを
介して、少しだけ下端へ段落状となるよう延設されてい
る。Further, a required number of gap gauge pieces 4 are provided between the non-curved gap gauge pieces 5 from the base end portion 3 for operation, and are substantially separated from the non-curved gap gauge pieces 5 with a slit 6 interposed therebetween. In the illustrated example, the gap gauge piece 4 is integrally formed with the pair of non-curved gap gauge pieces 5 from the substrate portion 5a to form a continuous portion 4a. It is slightly extended to the lower end to form a paragraph.
【００２６】もちろん、上記の非弯曲間隙ゲージ片５と
間隙ゲージ片４は、何れも燃料棒や太径水管に傷を付け
ない程度の硬質性と繰り返しの弯曲使用に耐えるポリア
セタール等の合成樹脂製であって、各非弯曲間隙ゲージ
片５は何れも、原子燃料集合体Ｔの見通し方向における
隙間Ｇに係る間隙基準値の厚さをもって形成され、間隙
ゲージ片４は、前同様にして、先端に原子燃料集合体Ｔ
の見通し方向にない隙間ｇに係る間隙基準値の厚さをも
った短尺ゲージ部１が、ここでは上記非弯曲間隙ゲージ
片５の先端部から延出する長さにて形成されている。[0026] Of course, non-curved gap gauge strip 5 and the gap gauge strip 4 described above, Polya to withstand both the fuel rods and thickness径水tube degree of hard and repeatability of curved used not to damage the
Each of the non-curved gap gauge pieces 5 is made of a synthetic resin such as cetal or the like in the line of sight of the nuclear fuel assembly T.
The gap gauge piece 4 is formed with the thickness of the gap reference value relating to the gap G, and the tip of the nuclear fuel assembly T
Short gauge portion 1 having a thickness of the gap reference value according to the no-sight direction gap g of, here are formed by a length extending from the distal end of the non-curved gap gauge strip 5.
【００２７】さらに、上記の短尺ゲージ部１よりも肉薄
に形成して可撓性をもたせた弯曲自在な長尺連結部２
が、前記操作用基端部３まで長手方向に延設されてお
り、しかも、この際、前記の非弯曲間隙ゲージ片５の厚
さが、上記間隙ゲージ片４における短尺ゲージ部１の厚
さより大きく形成されており、図示例では図２の場合と
略同様に、挟持上部３ａと挟持下部３ｂとの間に、基板
部５ａを挟持し、この状態を、貫通した締着ボルト３ｃ
と、図３では示されていない図２と同様のナット３ｄと
によって固定するようにしている。Further, the flexible long connecting portion 2 which is formed thinner than the short gauge portion 1 and has flexibility.
Is extended in the longitudinal direction to the operation base end 3, and at this time, the thickness of the non-curved gap gauge piece 5 is larger than the thickness of the short gauge section 1 in the gap gauge piece 4. In the illustrated example, the board portion 5a is sandwiched between the holding upper portion 3a and the holding lower portion 3b in a manner similar to the case of FIG.
And a nut 3d similar to FIG. 2 which is not shown in FIG.
【００２８】そこで、これを用いて検査するには、請求
項２と同じく操作用基端部３を把持して、原子燃料集合
体Ｔの見通し方向における隙間Ｇに挿入して行くことと
なり、この際、間隙ゲージ片４における短尺ゲージ部１
の厚さは、同上隙間Ｇよりも小さく形成されているの
で、当該短尺ゲージ部１は支障なく進入可能であると共
に、非弯曲間隙ゲージ片５は、見通し方向における隙間
Ｇに進入することで、これが当該間隙基準値に形成され
ているか否かを検査し得ることとなる。この際非弯曲間
隙ゲージ片５は一対設けられているので、当該見通し方
向における隙間Ｇにつき、その長手方向所望複数箇所に
おける検査が、この一回の挿入操作で実現されることと
なる。Therefore, in order to carry out the inspection using this, the operation base end portion 3 is gripped in the same manner as in claim 2 and the nuclear fuel assembly is held.
It is inserted into the gap G in the line-of-sight direction of the body T. At this time, the short gauge portion 1 of the gap gauge piece 4
Is formed smaller than the gap G, as described above, so that the short gauge section 1 can enter without any trouble, and the non-curved gap gauge piece 5 enters the gap G in the line-of-sight direction. It can be checked whether or not this is formed at the gap reference value. At this time, since the pair of the non-curved gap gauge pieces 5 is provided, the inspection at a plurality of desired locations in the longitudinal direction of the gap G in the line-of-sight direction is realized by this single insertion operation.
【００２９】さらに、上記の挿入操作を進行させれば、
遂に、非弯曲間隙ゲージ片５から延出している間隙ゲー
ジ片４の短尺ゲージ部１が、図示例では燃料棒や太径水
管に当接することによって、肉薄の長尺連結部２が弯曲
され、これによって、短尺ゲージ部１が前記の如く見通
し方向にない隙間ｇ内へ進入して行き、これが所定の間
隙基準値であるか否かを検査し得ることとなるから、当
該一回の挿入操作で同上両隙間Ｇ、ｇを検査することが
できる。Further, if the above insertion operation is advanced,
Finally, short gauge portion 1 of the clearance gauge strip 4 extending from the non-curved gap gauge piece 5, by abutting the fuel rod and the large-diameter water <br/> tube in the illustrated embodiment, the elongated connecting portion of the thin 2 is curved, whereby the short gauge portion 1 enters the gap g which is not in the line-of-sight direction as described above, and it can be checked whether or not this is a predetermined gap reference value. Both gaps G and g can be inspected by a single insertion operation.
【００３０】[0030]
【発明の効果】本発明は以上のように構成されるもので
あるから、請求項１によるときは、見通しのきかない位
置に存する隙間についても、短尺ゲージ部に連設の肉薄
とした長尺連結部の配設により、検査に際しての送入操
作により、当該挿入方向に対して例えば±６０°といっ
た広範囲の弯曲が可能となり、これまで困難視された
り、隙間ゲージの折損などが懸念されていた従来手段の
欠陥を解消して、迅速かつ高信頼性をもった検査を行う
ことができる。Since the present invention is constructed as described above, according to the first aspect, even a gap existing at a position where the line of sight cannot be seen, the thin long section connected to the short gauge section. The arrangement of the connecting portion allows a wide range of curvature, for example, ± 60 °, in the insertion direction by the feeding operation at the time of the inspection, and there has been a concern that it has been considered difficult or that the gap gauge is broken. The defect of the conventional means can be eliminated, and the inspection can be performed quickly and with high reliability.
【００３１】また、金属材料でなく合成樹脂を用いる
が、その硬度と繰り返し使用に耐える性質のものを採択
することで、燃料棒や太径水管に検査傷を与えることな
く、しかも、検査による変形がないため、その信頼性を
も向上させることができる。Although a synthetic resin is used instead of a metal material, by adopting a material having a hardness and a property that can withstand repeated use, the fuel rod and the large-diameter water pipe can be inspected without being damaged, and the deformation caused by the inspection can be prevented. Therefore, the reliability can be improved.
【００３２】請求項２によるときは、操作用基端部によ
って、その操作性を向上でき、しかも、間隙ゲージ片の
複数を離間併設することによって、一回の検査操作によ
って見通し方向にない隙間につき、その長手方向におけ
る複数箇所の検査ができることとなり、検査を効率的に
行うことができる。According to the second aspect of the present invention, the operability can be improved by the operation base end portion. In addition, by providing a plurality of gap gauge pieces separately from each other, a gap that is not in the line-of-sight direction by one inspection operation can be obtained. In addition, inspection at a plurality of locations in the longitudinal direction can be performed, and the inspection can be performed efficiently.
【００３３】請求項３にあっては、操作用基端部による
操作性向上だけでなく、非弯曲間隙ゲージ片と間隙ゲー
ジ片とを適切に併設したことで、見通し方向における隙
間と、見通し方向にない隙間とを、一回の検査によって
順次検査できると共に、その各併設数を適宜増設するこ
とで、上記両隙間について、夫々複数箇所の検査を一度
に行うこともできる。According to the third aspect, not only the operability is improved by the operation base end portion, but also the non-curved gap gauge piece and the gap gauge piece are appropriately provided so that the gap in the line-of-sight direction is provided.
The gaps and gaps that are not in the line of sight can be sequentially inspected by one inspection, and the inspection can be performed at a plurality of locations at a time for each of the gaps by appropriately increasing the number of juxtapositions.
【図１】本発明の請求項１のに係る間隙検査用合成樹脂
製隙間ゲージを示し、（Ａ）は、その要部を示す側面図
で、（Ｂ）は原子燃料集合体における使用状態を示す平
面説明図である。[1] gap inspection synthetic resin according to claim 1 of the present invention
Indicates Ltd. feeler gauge, (A) is a side view showing a main portion thereof, is an explanatory plan view showing a use state in (B) is a nuclear fuel assembly.
【図２】請求項２に係る前同合成樹脂製隙間ゲージを示
し、（Ａ）はその平面図で、（Ｂ）は一部切欠の側面図
である。FIGS. 2A and 2B show the same synthetic resin gap gauge according to claim 2, wherein FIG. 2A is a plan view and FIG. 2B is a partially cutaway side view.
【図３】請求項３のに係る合成樹脂製隙間ゲージを示
し、（Ａ）はその平面図で、（Ｂ）は側面図である。FIGS. 3A and 3B show a synthetic resin gap gauge according to claim 3, wherein FIG. 3A is a plan view and FIG. 3B is a side view.
【図４】原子燃料集合体における検査すべき隙間を示し
た平面説明図である。FIG. 4 is an explanatory plan view showing a gap to be inspected in the nuclear fuel assembly.
１ 短尺ゲージ部 １ａ 基端 ２ 長尺連結部 ３ 操作用基端部 ３′ 側端 ４ 間隙ゲージ片 ５ 非弯曲間隙ゲージ片 ６ スリット ｇ 見通し方向にない隙間 Ｇ 見通し方向における隙間 Ｔ 原子燃料集合体 1 short gauge portion 1a proximal end 2 elongated connecting portion 3 operating base end portion 3 'end 4 gap gauge strip 5 non curved gap gauge strips 6 clearance T nuclear fuel assemblies in the gap G sight direction without the slit g outlook direction
Claims (3)
を付けない程度の硬質性と、繰り返しの弯曲使用に耐え
るポリアセタール等の合成樹脂製であって、先端には前
記燃料棒と太径水管との見通し方向にない隙間に係る間
隙基準値の厚さをもった短尺ゲージ部が形成され、この
短尺ゲージ部の基端からは、当該短尺ゲージ部よりも肉
薄に形成して可撓性をもたせた弯曲自在な長尺連結部
が、長手方向に延設されていることを特徴とする原子燃
料集合体の検査用合成樹脂製隙間ゲージ。1. A synthetic resin, such as polyacetal , which is hard enough not to damage fuel rods and large-diameter water pipes of a nuclear fuel assembly , and which can withstand repeated use, and has a front end.
A short gauge portion having a thickness of a gap reference value related to a gap that is not in the line of sight between the fuel rod and the large diameter water pipe is formed, and the short gauge portion is formed from a base end of the short gauge portion. atoms retardant which curved freely elongate connecting portion remembering formed and flexible thinner than section, characterized in that extends in the longitudinal direction
Gauge made of synthetic resin for inspection of charge aggregates .
方向へ離間して、複数の間隙ゲージ片が、前方へ向けて
略併行等長となるよう一平面内に突設され、この間隙ゲ
ージ片は、何れも原子燃料集合体の燃料棒や太径水管に
傷を付けない程度の硬質性と、繰り返しの弯曲使用に耐
えるポリアセタール等の合成樹脂製であって、先端には
前記燃料棒と太径水管との見通し方向にない隙間に係る
間隙基準値の厚さをもった短尺ゲージ部が形成され、こ
の短尺ゲージ部の基端からは、当該短尺ゲージ部よりも
肉薄に形成して可撓性をもたせた弯曲自在な長尺連結部
が、前記操作用基端部まで長手方向に延設されているこ
とを特徴とする原子燃料集合体の検査用合成樹脂製隙間
ゲージ。2. A plurality of gap gauge pieces projecting from one side end of the operation base end portion in a plane so as to be substantially parallel to each other in a forward direction so as to be substantially parallel to each other. Each of the gap gauge pieces is made of a synthetic resin such as polyacetal , which is hard enough not to damage the fuel rods and the large-diameter water pipes of the nuclear fuel assembly , and which withstands repeated bending use.
A short gauge portion having a thickness of a gap reference value is formed according to a gap that is not in a line-of-sight direction between the fuel rod and the large diameter water pipe, and the short gauge portion is formed from a base end of the short gauge portion. A flexurally long connecting portion formed to be thinner and having flexibility and extending in the longitudinal direction to the base end portion for operation, wherein the composite for inspection of a nuclear fuel assembly is characterized in that: Resin gap gauge.
方向へ離間して、一対の非弯曲間隙ゲージ片が、前方へ
向けて略併行等長となるよう一平面内に突設されると共
に、当該各非弯曲間隙ゲージ片の間には、上記操作用基
端部から所要数の間隙ゲージ片が、スリットを隔てて、
略同一平面内で併行に突設され、これらの非弯曲間隙ゲ
ージ片と間隙ゲージ片は、何れも原子燃料集合体の燃料
棒や太径水管に傷を付けない程度の硬質性と繰り返しの
弯曲使用に耐えるポリアセタール等の合成樹脂製であっ
て、各非弯曲間隙ゲージ片は何れも、前記燃料棒と太径
水管との見通し方向の隙間に係る間隙基準値の厚さをも
って形成され、間隙ゲージ片は、先端に前記燃料棒と太
径水管との見通し方向にない隙間に係る間隙基準値の厚
さをもった短尺ゲージ部が上記非弯曲間隙ゲージ片の先
端部から延出する長さにて形成され、かつ、当該短尺ゲ
ージ部よりも肉薄に形成して可撓性をもたせた弯曲自在
な長尺連結部が、前記操作用基端部まで長手方向に延設
され、前記非弯曲間隙ゲージ片の厚さが、上記間隙ゲー
ジ片における短尺ゲージ部の厚さよりも大であることを
特徴とする原子燃料集合体の検査用合成樹脂製隙間ゲー
ジ。3. A pair of non-curved gap gauge pieces project from one side end of the operation base end portion in a plane so as to be substantially parallel to each other in a forward direction so as to be substantially parallel to each other. Along with being provided, between the non-curved gap gauge pieces, a required number of gap gauge pieces are separated from the slit from the base end for operation by a slit,
Projecting from the parallel in substantially the same plane, the fuel of these non-curved gap gauge strip and gap gauge strips are all nuclear fuel assemblies
It is made of a synthetic resin such as polyacetal which is hard enough not to damage rods and large-diameter water pipes and which can withstand repeated use in bending.
The gap gauge piece is formed with the thickness of the gap reference value relating to the gap in the line of sight with the water pipe, and the tip of the gap gauge piece is thickened with the fuel rod.
A short gauge part having a thickness of a gap reference value relating to a gap not in the line of sight with the radial water pipe is formed with a length extending from a tip end of the non-curved gap gauge piece, and the short gauge part A flexible, long connecting portion, which is formed to be thinner and has flexibility, is extended in the longitudinal direction to the operation base end portion, and the thickness of the non-curved gap gauge piece is equal to the gap gauge. A gap gauge made of synthetic resin for inspection of a nuclear fuel assembly , characterized in that the gap gauge is larger than the thickness of the short gauge section of the piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6200187A JP2923603B2 (en) | 1994-08-02 | 1994-08-02 | Synthetic resin clearance gauge for inspection of nuclear fuel assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6200187A JP2923603B2 (en) | 1994-08-02 | 1994-08-02 | Synthetic resin clearance gauge for inspection of nuclear fuel assemblies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0843003A JPH0843003A (en) | 1996-02-16 |
| JP2923603B2 true JP2923603B2 (en) | 1999-07-26 |
Family
ID=16420249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6200187A Expired - Fee Related JP2923603B2 (en) | 1994-08-02 | 1994-08-02 | Synthetic resin clearance gauge for inspection of nuclear fuel assemblies |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2923603B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004007112B3 (en) * | 2004-02-13 | 2005-08-04 | Indunorm Hydraulik Gmbh | Device for checking internal dimensions of press connection has test bodies of different dimensions connected by joints and arranged at distance apart; test body nearest front has smallest dimensions and the rearmost the largest dimensions |
| JP2008286674A (en) * | 2007-05-18 | 2008-11-27 | Central Motor Co Ltd | Clearance gauge for product |
-
1994
- 1994-08-02 JP JP6200187A patent/JP2923603B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0843003A (en) | 1996-02-16 |
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