JPH09113662A - Fuel rod for nuclear fuel assembly - Google Patents

Fuel rod for nuclear fuel assembly

Info

Publication number
JPH09113662A
JPH09113662A JP7273924A JP27392495A JPH09113662A JP H09113662 A JPH09113662 A JP H09113662A JP 7273924 A JP7273924 A JP 7273924A JP 27392495 A JP27392495 A JP 27392495A JP H09113662 A JPH09113662 A JP H09113662A
Authority
JP
Japan
Prior art keywords
fuel
cladding tube
metal
pellet
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.)
Pending
Application number
JP7273924A
Other languages
Japanese (ja)
Inventor
Satoshi Sugano
智 菅野
Yoshinari Kawada
能成 川田
Katahito Yamada
賢仁 山田
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.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi 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 Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP7273924A priority Critical patent/JPH09113662A/en
Publication of JPH09113662A publication Critical patent/JPH09113662A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a structure which will not lead to the damage to fuel rods for a nuclear reactor even if high pressure acts on them. SOLUTION: A metal cylindrical member 6 is placed between a plenum spring 5 and a fuel pellet 4. The size of the metal cylindrical member 6 is almost the same as that of the fuel pellet 4. Even if the plenum spring 5 is crushed, a cladding tube 3 will get in contact with the cylindrical member 6 at the corner of it. Since metal is softer than ceramics, the chamfering of the corner as well as the deformation of the cylindrical member 6 disables the corner from damaging the cladding tube 3. Moreover, the action of high pressure deforms the cladding tube 3 in such a way as it compresses the metal cylindrical member 6. Consequently, the fuel pellet 4 can be sealed up in the fuel cladding tube 3.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、原子燃料集合体の
一構成要素である燃料棒および燃料ペレットに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel rod and a fuel pellet, which are constituent elements of a nuclear fuel assembly.

【0002】[0002]

【従来の技術】原子燃料集合体は、複数の燃料ロッドと
水ロッドとロッドの間隔を確保する縦方向に複数設置さ
れたスペーサと上,下部タイプレートと、さらに、沸騰
水型原子燃料集合体にはチャンネルボックスとから構成
されている。燃料集合体の一構成要素である燃料棒は、
上下端栓と燃料被覆管と燃料ペレットとプレナムスプリ
ングとから構成されている。
2. Description of the Related Art A nuclear fuel assembly includes a plurality of fuel rods, a plurality of spacers vertically installed to secure the distance between water rods, upper and lower tie plates, and a boiling water nuclear fuel assembly. Consists of a channel box and. The fuel rod, which is a component of the fuel assembly,
It is composed of upper and lower end plugs, a fuel cladding tube, fuel pellets, and a plenum spring.

【0003】原子燃料集合体の海上輸送では、仮に海中
に没しても、深層防護の観点から、燃料集合体の健全性
を確保する必要がある。しかし、数千m以上の海底では
数百気圧以上の圧力が燃料棒に作用して、燃料棒のプレ
ナムスプリングが挿入されている部分(プレナム部)がつ
ぶれる可能性がある。燃料ペレットはセラミックスであ
り、非常に硬い。従って、プレナム部がつぶれると、プ
レナムスプリングに隣接する燃料ペレットの角に大きな
応力が発生して、被覆管が壊れる可能性が考えられる。
しかし、従来の技術では、燃料棒に高圧力が作用するこ
とは想定されていなかった。
In the marine transportation of a nuclear fuel assembly, it is necessary to secure the integrity of the fuel assembly from the viewpoint of defense in depth, even if it is submerged in the sea. However, on the seabed of several thousand meters or more, a pressure of several hundred atmospheres or more may act on the fuel rod, and the portion (plenum portion) of the fuel rod where the plenum spring is inserted may be crushed. Fuel pellets are ceramics and are very hard. Therefore, if the plenum portion is crushed, a large stress may occur in the corner of the fuel pellet adjacent to the plenum spring, and the cladding tube may be broken.
However, in the prior art, it was not assumed that high pressure acts on the fuel rods.

【0004】[0004]

【発明が解決しようとする課題】請求項1の課題は、燃
料棒に高圧力が作用しても、燃料棒が破損に至らない構
造、並びに、燃料棒に高圧力が作用した場合に燃料ペレ
ットを燃料被覆管内に封止する構造を提供することであ
る。
An object of the present invention is to provide a structure in which even if a high pressure acts on a fuel rod, the fuel rod is not damaged, and a fuel pellet when the high pressure acts on the fuel rod. To provide a structure for sealing the inside of the fuel cladding tube.

【0005】請求項2の課題は、請求項1の円柱部材が
燃料棒の高温での使用で悪影響を及ぼさないことであ
る。
The object of claim 2 is that the cylindrical member of claim 1 does not adversely affect the use of the fuel rod at high temperatures.

【0006】請求項3の課題は、請求項1よりも、燃料
棒が破損し難い構造を提供することである。
An object of claim 3 is to provide a structure in which the fuel rod is less likely to be damaged than in claim 1.

【0007】請求項4の課題は、プレナム部の体積を確
保することである。
The object of claim 4 is to secure the volume of the plenum.

【0008】請求項5の課題は、請求項1の燃料棒に高
圧力が作用した場合に燃料ペレットを燃料被覆管内に封
止する構造で、より封止性を向上させることである。
A fifth object of the present invention is to further improve the sealing property by the structure for sealing the fuel pellets in the fuel cladding tube when a high pressure acts on the fuel rod of the first invention.

【0009】請求項6と請求項7の課題は、請求項1の
円柱部材に好敵な寸法を与えることである。
It is an object of claims 6 and 7 to provide the columnar member of claim 1 with favorable dimensions.

【0010】請求項8と請求項9の課題は、請求項4と
同じく、プレナム部の体積を確保することである。
The object of claims 8 and 9 is to secure the volume of the plenum, as in claim 4.

【0011】[0011]

【課題を解決するための手段】請求項1の課題を解決す
る手段は、プレナムスプリングと燃料ペレットの間に金
属製の円柱部材を設けることである。被覆管に封入され
る燃料ペレットはセラミックスであり、非常に硬いため
に、燃料棒に高圧力が作用すると、プレナムスプリング
に隣接する燃料ペレットの角で被覆管が壊れる可能性が
あった。燃料ペレットとほぼ同一寸法の金属円柱部材を
設ければ、プレナム部がつぶれても、被覆管は金属円柱
部材の角で接することになる。金属はセラッミクスより
軟らかいので、円柱部材が変形することによって、角で
被覆管が壊れる可能性はない。また、高圧力が作用する
と、被覆管は金属円柱部材を絞め込むように変形するの
で、結果的には、燃料ペレットを燃料被覆管内に封止す
ることが可能となる。
The means for solving the problem of claim 1 is to provide a metallic column member between the plenum spring and the fuel pellet. Since the fuel pellets enclosed in the cladding tube are made of ceramics and are very hard, there is a possibility that the cladding tube may be broken at the corner of the fuel pellet adjacent to the plenum spring when high pressure is applied to the fuel rod. If a metal columnar member having substantially the same size as the fuel pellet is provided, the cladding tube will contact at the corner of the metal columnar member even if the plenum portion is crushed. Since metal is softer than ceramics, there is no possibility of the cladding being broken at the corners due to the deformation of the cylindrical member. Further, when a high pressure acts, the cladding tube is deformed so as to squeeze the metal columnar member, and as a result, the fuel pellets can be sealed inside the fuel cladding tube.

【0012】請求項2の課題を解決する手段は、金属製
の円柱部材を燃料被覆管と同一材料、若しくは、被覆管
よりも線膨張係数が小さい材料で製造することである。
被覆管よりも大きな線膨張係数を有する材料で円柱部材
を製作すると、燃料棒の高温での使用の際に、円柱部材
が被覆管を押し広げる可能性がある。
The means for solving the problem of claim 2 is to manufacture the cylindrical member made of metal from the same material as the fuel cladding tube or a material having a smaller linear expansion coefficient than the cladding tube.
If the cylindrical member is made of a material having a larger linear expansion coefficient than that of the cladding tube, the cylindrical member may spread the cladding tube when the fuel rod is used at a high temperature.

【0013】請求項3の課題を解決する手段は、金属製
の円柱部材の角部を面取りすること、または、角部にR
を設けることである。円柱部材の角部に面やRを設けれ
ば、角部に接する燃料被覆管に発生する応力を小さくで
きる。
Means for solving the problem of claim 3 is to chamfer the corners of a metal cylindrical member, or to round the corners.
Is to be provided. If the surface or R is provided at the corner of the columnar member, the stress generated in the fuel cladding tube contacting the corner can be reduced.

【0014】請求項4の課題を解決する手段は、金属製
の円柱部材に軸方向に貫通しない単数または複数の孔を
設けることである。燃料棒で、プレナム部は燃焼に伴っ
て発生するガスを貯めるものである。金属製の円柱部材
はプレナム部の体積を減少させることになる。そこで、
円柱部材に孔を設ければ、プレナム部の体積減少を小さ
く抑えることができる。一方、燃料ペレットを燃料被覆
管内に封止するためには、孔は軸方向に貫通しないこと
が必要である。
A means for solving the problem of claim 4 is to provide a cylindrical member made of metal with a single hole or a plurality of holes which do not penetrate axially. The plenum is a fuel rod that stores the gas generated by combustion. The metal columnar member reduces the volume of the plenum. Therefore,
If the columnar member is provided with a hole, the volume decrease of the plenum can be suppressed to a small level. On the other hand, in order to seal the fuel pellet in the fuel cladding tube, it is necessary that the hole does not penetrate axially.

【0015】請求項5の課題を解決する手段は、金属製
の円柱部材の外面円周方向に単数または複数の溝を設け
ることである。高圧力が作用すると、燃料被覆管がつぶ
れて、溝にはまり込み、円柱部材が移動することがなく
なるので、燃料ペレットの燃料被覆管への封止性は向上
する。
The means for solving the problem of claim 5 is to provide a single or a plurality of grooves in the outer circumferential direction of the cylindrical member made of metal. When the high pressure acts, the fuel cladding tube is crushed, fits into the groove, and the columnar member does not move, so that the sealing property of the fuel pellet in the fuel cladding tube is improved.

【0016】請求項6と請求項7の課題を解決する手段
としては、まず、金属製の円柱部材の直径を燃料ペレッ
トとほぼ等しくすることが望ましい。すなわち、直径が
異なると段差が生じて、段差で被覆管が壊れる可能性が
でてくる。しかし、段差が直径の数%以下と小さけれ
ば、被覆管が壊れない。また、金属製の円柱部材の長さ
は、燃料棒の組立て時における、円柱部材の回転を防止
する観点から、直径の1/2以上が望ましい。一方、前
述したように、プレナム部の体積を極力減少させないと
いう観点から、金属製の円柱部材の長さは燃料ペレット
の長さ以下とすることが望ましい。
As means for solving the problems of claims 6 and 7, first, it is desirable that the diameter of the metal columnar member is made substantially equal to that of the fuel pellet. That is, if the diameters are different, a step is generated, and the cladding tube may be broken at the step. However, if the step is as small as a few percent or less of the diameter, the cladding tube will not break. Further, the length of the metal columnar member is preferably 1/2 or more of the diameter from the viewpoint of preventing the rotation of the columnar member when the fuel rod is assembled. On the other hand, as described above, it is desirable that the length of the metal columnar member be equal to or less than the length of the fuel pellet from the viewpoint of not reducing the volume of the plenum as much as possible.

【0017】請求項8と請求項9の課題を解決する手段
は、プレナムスプリングに隣接する燃料ペレットに金属
製の円板部材を接合すること、または、燃料ペレットに
隣接するプレナムスプリングに金属製の円板部材を接合
することである。従来の燃料棒では、プレナムスプリン
グにウェハとよばれる円板が設けられており、円板で燃
料ペレットを押さえる構造となっている。しかし、円板
はプレナムスプリングに点溶接されているのみであり、
また、厚さが約1mm以下と薄いため、燃料被覆管が変形
するような高い圧力が作用したときに点溶接が外れる懸
念がある。そこで、燃料ペレットに円板部材を接合すれ
ば、接合面積を大きくでき、かつ、接合力を大きくする
ことができるので、接合面が剥離することはない。一
方、従来の構造と同様に、プレナムスプリングに円板を
設ける場合には、前述したように、回転防止の観点か
ら、厚さを直径の1/2以上とすることが望ましい。
The means for solving the problems of claims 8 and 9 are to join a metal disk member to the fuel pellet adjacent to the plenum spring, or to connect the metal disk member to the plenum spring adjacent to the fuel pellet. Joining the disc members. In the conventional fuel rod, a disc called a wafer is provided on the plenum spring, and the disc holds the fuel pellets. However, the disc is only spot welded to the plenum spring,
Further, since the thickness is as thin as about 1 mm or less, there is a concern that the spot welding may come off when a high pressure that deforms the fuel cladding tube is applied. Therefore, by joining the disc member to the fuel pellet, the joining area can be increased and the joining force can be increased, so that the joining surface is not separated. On the other hand, like the conventional structure, when the disc is provided on the plenum spring, it is desirable to set the thickness to 1/2 or more of the diameter from the viewpoint of preventing rotation as described above.

【0018】[0018]

【発明の実施の形態】本発明の実施の形態を以下に説明
する。
Embodiments of the present invention will be described below.

【0019】図1は原子燃料集合体の一構成要素であ
る、上部端栓1と下部端栓2と燃料被覆管3と燃料ペレ
ット4とプレナムスプリング5とからなる燃料棒で、燃
料ペレット4とプレナムスプリング5の間に金属製の円
柱部材6を設けた燃料棒である。なお、金属製の円柱部
材6は燃料被覆管3と同一材料、若しくは、被覆管3よ
りも線膨張係数が小さい材料で製造することが必要とな
る。これは、被覆管3よりも大きな線膨張係数を有する
材料で円柱部材6を製作すると、燃料棒3の高温での使
用の際に、円柱部材6が燃料被覆管3を押し広げる可能
性があるためである。
FIG. 1 is a fuel rod composed of an upper end plug 1, a lower end plug 2, a fuel cladding tube 3, a fuel pellet 4 and a plenum spring 5, which is one component of a nuclear fuel assembly. It is a fuel rod in which a metal columnar member 6 is provided between plenum springs 5. The metal cylindrical member 6 must be made of the same material as the fuel cladding tube 3 or a material having a smaller linear expansion coefficient than the cladding tube 3. This is because when the columnar member 6 is made of a material having a larger linear expansion coefficient than that of the cladding tube 3, the columnar member 6 may spread the fuel cladding tube 3 when the fuel rod 3 is used at a high temperature. This is because.

【0020】燃料棒に、高い圧力が作用すると、燃料被
覆管3は、図2に示したように、プレナムスプリング5
が設置されたプレナム部で変形する。本発明である金属
製の円柱部材6を、燃料ペレット4とプレナムスプリン
グ5の間に設ければ、変形は金属製の円柱部材6の角で
生じる。金属製の円柱部材6は、セラミックスである燃
料ペレット4よりも軟らかいので、角で燃料被覆管3が
破れることはない。さらに、図2に示した金属製の円柱
部材6には、角部に面取り6−1が施されている。これ
は角部に接する燃料被覆管3に発生する応力を小さくす
るためである。本構造により、燃料棒に高い圧力が作用
しても、燃料ペレット4を燃料被覆管3の内部に封止す
ることができる。また、金属製の円柱部材6には軸方向
に貫通しない孔6−2が設けてある。これは、燃焼に伴
って発生するガスを貯めるためのプレナム部の体積を極
力減少させないためである。一方、燃料ペレット4を燃
料被覆管3の内部に封止するには、孔6−2は軸方向に
貫通しないことが必要である。
When high pressure is applied to the fuel rods, the fuel cladding tube 3 causes the plenum spring 5 to move, as shown in FIG.
Deforms at the plenum part where is installed. When the metallic columnar member 6 of the present invention is provided between the fuel pellet 4 and the plenum spring 5, the deformation occurs at the corners of the metallic columnar member 6. Since the metal cylindrical member 6 is softer than the fuel pellet 4 made of ceramics, the fuel cladding tube 3 will not be broken at the corners. Further, the metal columnar member 6 shown in FIG. 2 has chamfers 6-1 at its corners. This is to reduce the stress generated in the fuel cladding tube 3 in contact with the corners. With this structure, the fuel pellets 4 can be sealed inside the fuel cladding tube 3 even if a high pressure acts on the fuel rods. Further, the metal columnar member 6 is provided with a hole 6-2 which does not penetrate in the axial direction. This is because the volume of the plenum portion for storing the gas generated by the combustion is not reduced as much as possible. On the other hand, in order to seal the fuel pellets 4 inside the fuel cladding tube 3, it is necessary that the holes 6-2 do not penetrate axially.

【0021】図3は金属製の円柱部材6の外面円周方向
に溝6−3を設けた実施の形態である。高圧力が作用す
ると、図示しない燃料被覆管3がつぶれて、溝6−3に
はまり込み、円柱部材6が移動することがなくなるの
で、燃料ペレット4の燃料被覆管3への封止性は向上す
る。さらに、図4に示したように、溝6−3の角を面取
り6−1すれば、前述したように、角に接する燃料被覆
管3に発生する応力を小さくすることができる。またさ
らに、図5に示したように、複数の溝6−3を設けれ
ば、燃料ペレット4の燃料被覆管3への封止性はさらに
向上する。
FIG. 3 shows an embodiment in which a groove 6-3 is provided in the outer circumferential direction of a cylindrical member 6 made of metal. When a high pressure is applied, the fuel cladding tube 3 (not shown) is crushed, fits into the groove 6-3, and the columnar member 6 is prevented from moving. Therefore, the sealing property of the fuel pellet 4 to the fuel cladding tube 3 is improved. To do. Further, by chamfering the corner of the groove 6-3 as shown in FIG. 4, the stress generated in the fuel cladding tube 3 in contact with the corner can be reduced as described above. Furthermore, as shown in FIG. 5, if a plurality of grooves 6-3 are provided, the sealing property of the fuel pellet 4 to the fuel cladding tube 3 is further improved.

【0022】図6は本発明である金属製の円柱部材6の
寸法を規定したものである。金属製の円柱部材6の直径
Dは、0.95Dp≦D≦Dp とする。ここで、Dpは
燃料ペレットの直径である。また、長さLは、0.5D
≦L≦Lp とする。ここで、Lpは燃料ペレットの長
さである。理由は、前述した通りであり、ここでは省略
する。
FIG. 6 defines the dimensions of the metal cylindrical member 6 according to the present invention. The diameter D of the metal cylindrical member 6 is 0.95 Dp ≦ D ≦ Dp. Here, Dp is the diameter of the fuel pellet. Also, the length L is 0.5D
Let ≦ L ≦ Lp. Here, Lp is the length of the fuel pellet. The reason is as described above, and is omitted here.

【0023】図7と図8は、それぞれ、プレナムスプリ
ング5に隣接する燃料ペレット4に金属製の円板部材7
を接合した実施の形態と、プレナムスプリング5に円板
部材7を点溶接した実施の形態である。なお、図8で、
前述した理由から、円板部材7の厚さtは直径Dの1/
2以上が望ましい。
FIGS. 7 and 8 respectively show a metal disk member 7 on the fuel pellet 4 adjacent to the plenum spring 5.
And the disc member 7 is spot-welded to the plenum spring 5. In addition, in FIG.
For the reason described above, the thickness t of the disk member 7 is 1 / the diameter D.
2 or more is desirable.

【0024】[0024]

【発明の効果】本発明によれば、仮に、燃料棒に高圧力
が作用しても、燃料被覆管が破れることはなく、かつ、
燃料ペレットを燃料被覆管の内部に封止することができ
る。
According to the present invention, even if a high pressure acts on the fuel rod, the fuel cladding tube will not be broken, and
The fuel pellets can be sealed inside the fuel cladding.

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

【図1】本発明の一実施の説明図。FIG. 1 is an explanatory diagram of one embodiment of the present invention.

【図2】面取りと孔加工を施した本発明の円柱部材の断
面図。
FIG. 2 is a cross-sectional view of a cylindrical member of the present invention that has been chamfered and holed.

【図3】外面周方向に単数または複数溝加工を施した本
発明の円柱部材の説明図。
FIG. 3 is an explanatory view of a cylindrical member of the present invention in which a single groove or a plurality of grooves are processed in the outer circumferential direction.

【図4】外面周方向に単数または複数溝加工を施した本
発明の円柱部材の説明図。
FIG. 4 is an explanatory view of a cylindrical member of the present invention in which a single groove or a plurality of grooves are processed in the outer circumferential direction.

【図5】外面周方向に単数または複数溝加工を施した本
発明の円柱部材の説明図。
FIG. 5 is an explanatory view of a cylindrical member of the present invention in which a single groove or a plurality of grooves are processed in the outer circumferential direction.

【図6】本発明の円柱部材の寸法規定の説明図。FIG. 6 is an explanatory view of the dimension regulation of the columnar member of the present invention.

【図7】本発明の他の実施の説明図。FIG. 7 is an explanatory view of another embodiment of the present invention.

【図8】本発明の他の実施の説明図。FIG. 8 is an explanatory diagram of another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1…上部端栓、2…下部端栓、3…燃料被覆管、4…燃
料ペレット、5…プレナムスプリング、6…円柱部材。
DESCRIPTION OF SYMBOLS 1 ... Upper end plug, 2 ... Lower end plug, 3 ... Fuel cladding tube, 4 ... Fuel pellet, 5 ... Plenum spring, 6 ... Cylindrical member.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 賢仁 茨城県日立市幸町三丁目2番1号 日立エ ンジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Yamada 3-2-1, Sachimachi, Hitachi, Ibaraki Prefecture Hitachi Engineering Co., Ltd.

Claims (9)

【特許請求の範囲】[Claims] 【請求項1】上,下部端栓と燃料被覆管と燃料ペレット
とプレナムスプリングとからなる燃料棒において、プレ
ナムスプリングと前記燃料ペレットの間に金属製の円柱
部材を設けたことを特徴とする原子力燃料集合体の燃料
棒。
1. A fuel rod comprising upper and lower end plugs, a fuel cladding tube, a fuel pellet and a plenum spring, wherein a cylindrical metal member is provided between the plenum spring and the fuel pellet. Fuel rod of a fuel assembly.
【請求項2】請求項1において、前記金属製の円柱部材
を前記燃料被覆管と同一材料、若しくは、前記燃料被覆
管よりも線膨張係数が小さい材料で製造する原子力燃料
集合体の燃料棒。
2. The fuel rod of a nuclear fuel assembly according to claim 1, wherein the metal columnar member is made of the same material as the fuel cladding tube or a material having a linear expansion coefficient smaller than that of the fuel cladding tube.
【請求項3】請求項1または2において、前記金属製の
円柱部材の端部を面取りすること、または、端部にRを
設けた原子力燃料集合体の燃料棒。
3. A fuel rod of a nuclear fuel assembly according to claim 1, wherein the end portion of the metal cylindrical member is chamfered or R is provided at the end portion.
【請求項4】請求項1,2または3において、前記金属
製の円柱部材に軸方向に貫通しない単数または複数の孔
を設けた原子力燃料集合体の燃料棒。
4. A fuel rod of a nuclear fuel assembly according to claim 1, 2 or 3, wherein said metal columnar member is provided with a single hole or a plurality of holes which do not penetrate axially.
【請求項5】請求項1,2,3または4において、前記
金属製の円柱部材の外面円周方向に単数または複数の溝
を設けた原子力燃料集合体の燃料棒。
5. A fuel rod for a nuclear fuel assembly according to claim 1, 2, 3 or 4, wherein one or more grooves are provided in a circumferential direction of an outer surface of said metal cylindrical member.
【請求項6】請求項1,2,3,4または5において、
前記金属製の円柱部材の長さを燃料ペレットとほぼ等し
くして、直径を燃料ペレットとほぼ等しいか、または、
数%小さくする原子力燃料集合体の燃料棒。
6. The method of claim 1, 2, 3, 4, or 5,
The length of the metal columnar member is substantially equal to the fuel pellet and the diameter thereof is substantially equal to the fuel pellet, or
Fuel rods of nuclear fuel assemblies that are reduced by a few percent.
【請求項7】請求項1,2,3,4または5において、
金属製の円柱部材の直径を燃料ペレットの直径とほぼ等
しくして、長さを直径の1/2以上とする原子力燃料集
合体の燃料棒。
7. The method according to claim 1, wherein
A fuel rod of a nuclear fuel assembly in which the diameter of a metal cylindrical member is substantially equal to the diameter of a fuel pellet, and the length is ½ or more of the diameter.
【請求項8】原子燃料集合体の一構成要素である、上,
下部端栓と燃料被覆管と燃料ペレットとプレナムスプリ
ングとからなる燃料棒において、プレナムスプリングに
隣接する燃料ペレットに、金属製の円板部材を接合する
原子力燃料集合体の燃料棒。
8. A component of a nuclear fuel assembly, above,
A fuel rod comprising a lower end plug, a fuel cladding tube, a fuel pellet, and a plenum spring. A fuel rod of a nuclear fuel assembly in which a metal disk member is joined to the fuel pellet adjacent to the plenum spring.
【請求項9】原子燃料集合体の一構成要素である、上,
下部端栓と燃料被覆管と燃料ペレットとプレナムスプリ
ングとからなる燃料棒において、前記燃料ペレットに隣
接する前記プレナムスプリングに、長さが直径の1/2
以上の金属製の円板部材を接合する原子力燃料集合体の
燃料棒。
9. A component of a nuclear fuel assembly, above,
In a fuel rod including a lower end plug, a fuel cladding tube, a fuel pellet, and a plenum spring, the length of the fuel rod adjacent to the fuel pellet is ½ of the diameter.
A fuel rod of a nuclear fuel assembly in which the above-mentioned metal disk members are joined.
JP7273924A 1995-10-23 1995-10-23 Fuel rod for nuclear fuel assembly Pending JPH09113662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7273924A JPH09113662A (en) 1995-10-23 1995-10-23 Fuel rod for nuclear fuel assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7273924A JPH09113662A (en) 1995-10-23 1995-10-23 Fuel rod for nuclear fuel assembly

Publications (1)

Publication Number Publication Date
JPH09113662A true JPH09113662A (en) 1997-05-02

Family

ID=17534475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7273924A Pending JPH09113662A (en) 1995-10-23 1995-10-23 Fuel rod for nuclear fuel assembly

Country Status (1)

Country Link
JP (1) JPH09113662A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771211A1 (en) * 1997-11-19 1999-05-21 Framatome Sa Nuclear fuel rod used in pressurized water reactor
WO2012094152A1 (en) * 2011-01-06 2012-07-12 Westinghouse Electric Company Llc Nuclear fuel rod plenum spring assembly
CN112489828A (en) * 2020-11-26 2021-03-12 中广核研究院有限公司 Shielding and cladding device for compactly arranging small-sized piles with large expansion difference

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771211A1 (en) * 1997-11-19 1999-05-21 Framatome Sa Nuclear fuel rod used in pressurized water reactor
WO1999026254A1 (en) * 1997-11-19 1999-05-27 Framatome Nuclear pencil
WO2012094152A1 (en) * 2011-01-06 2012-07-12 Westinghouse Electric Company Llc Nuclear fuel rod plenum spring assembly
CN103299371A (en) * 2011-01-06 2013-09-11 西屋电气有限责任公司 Nuclear fuel rod plenum spring assembly
US8666018B2 (en) 2011-01-06 2014-03-04 Westinghouse Electric Company Llc Nuclear fuel rod plenum spring assembly
RU2573582C2 (en) * 2011-01-06 2016-01-20 Вестингхаус Электрик Компани Ллс Fuel rod and pressure chamber spring assembly
CN112489828A (en) * 2020-11-26 2021-03-12 中广核研究院有限公司 Shielding and cladding device for compactly arranging small-sized piles with large expansion difference
CN112489828B (en) * 2020-11-26 2024-03-01 中广核研究院有限公司 Shielding and cladding device for compactly arranging small-sized stacks with large expansion difference

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