JP3195084B2 - Channel box - Google Patents
Channel boxInfo
- Publication number
- JP3195084B2 JP3195084B2 JP34206892A JP34206892A JP3195084B2 JP 3195084 B2 JP3195084 B2 JP 3195084B2 JP 34206892 A JP34206892 A JP 34206892A JP 34206892 A JP34206892 A JP 34206892A JP 3195084 B2 JP3195084 B2 JP 3195084B2
- Authority
- JP
- Japan
- Prior art keywords
- channel box
- fuel
- welding
- channel
- bending
- 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
- Butt Welding And Welding Of Specific Article (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、沸騰水型原子炉用燃料
集合体のチャンネルボックスに係り、特に、中性子照射
による曲がりの少ないチャンネルボックスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel box for a fuel assembly for a boiling water reactor, and more particularly to a neutron irradiation.
Channel box with less bend due to
【０００２】[0002]
【従来の技術】沸騰水型原子炉に使用されている燃料集
合体は、一般に図２の一部切断斜視図に示すように、燃
料集合体１は、内部に燃料である多数のペレットを内封
する複数の燃料棒２を複数の燃料スペーサ３で格子状に
配列し、その上下端を上部タイプレート４と下部タイプ
レート５で保持した燃料束６と、この燃料束６を断面四
角状のチャンネルボックス７に挿入して形成されてい
る。BACKGROUND OF THE INVENTION Fuel assemblies used in a boiling water reactor, the inner generally as shown in a partially cut-away perspective view of FIG. 2, the fuel assembly 1, a number of pellets as a fuel in internal A plurality of fuel rods 2 to be sealed are arranged in a grid pattern by a plurality of fuel spacers 3, and a fuel bundle 6 having upper and lower ends held by an upper tie plate 4 and a lower tie plate 5. It is formed by being inserted into the channel box 7.
【０００３】このチャンネルボックス７の素材は、通常
ジルコニウム合金であるジルカロイを用い、図２に示す
ように２枚のジルカロイ板の両端を同方向に折曲げてコ
字状とし、向かい合う２つの面の中央に溶接線８が位置
するように溶接して角筒にしている。As a material of the channel box 7, zircaloy, which is usually a zirconium alloy, is used. As shown in FIG. It is formed into a rectangular tube by welding so that the welding line 8 is located at the center.
【０００４】このチャンネルボックス７により、原子炉
における冷却水の流路が確保されていて、上部外側には
チャンネルボックス同士の間隔を保持するためのチャン
ネルスペーサ９が、また上端部には前記燃料束６との固
定のためのクリップ10が取り付けられている。[0004] The channel box 7 secures a flow path of cooling water in the nuclear reactor, and a channel spacer 9 for maintaining a space between the channel boxes is provided on the upper outer side, and the fuel bundle is provided on an upper end thereof. A clip 10 for fixing to the camera 6 is attached.
【０００５】[0005]
【発明が解決しようとする課題】通常、燃料集合体１を
所定の期間、すなわち３〜４年使用すると、チャンネル
ボックス７は原子炉内の冷却水及び中性子にさらされる
ため、チャンネルボックス７の素材であるジルカロイの
表面が酸化されて腐食する。特にステンレス鋼製品との
隣接部、および接触部分では腐食が生じ易いが、上部タ
イプレート４との接触部分では上部タイプレート４の素
材がステンレス鋼であることに起因する腐食のほか、微
細すきまによる冷却材の流通不良から、すきま腐食も発
生する。Normally, when the fuel assembly 1 is used for a predetermined period, that is, three to four years, the channel box 7 is exposed to cooling water and neutrons in the nuclear reactor. Zircaloy is oxidized and corroded. In particular, corrosion is likely to occur in the vicinity of and contact with stainless steel products, but in the contact with the upper tie plate 4, corrosion due to the material of the upper tie plate 4 being stainless steel, and fine clearances Crevice corrosion also occurs due to poor circulation of the coolant.
【０００６】前記の各種腐食の結果に生じる酸化被膜は
極めて脆いため、酸化被膜が厚くなると実質的にチャン
ネルボックス７の肉厚が減少し、強度の余裕が減少する
恐れがあった。さらに、酸化被膜が何らかの原因で剥が
れ落ちた場合には、冷却材に混入して原子炉内や配管等
に滞留すると放射線源となり、作業員に対する被曝増加
の原因となる恐れがあった。Since the oxide film resulting from the various types of corrosion described above is extremely brittle, if the oxide film is thickened, the wall thickness of the channel box 7 is substantially reduced, and there is a possibility that the strength margin may be reduced. Furthermore, if the oxide film is peeled off for some reason, it mixes with the coolant and stays in the reactor or pipes, etc., and becomes a radiation source, which may cause an increase in exposure to workers.
【０００７】次に中性子照射成長による影響としては、
向かい合う２つの面の長手方向の伸びが異なると曲がり
が発生し、燃料の燃焼分布に影響する可能性があるほ
か、チャンネルボックス７同士の間隙が図示しない制御
棒の挿入通路であるために、制御棒挿入の円滑操作性に
影響を及ぼす可能性があった。Next, the effects of neutron irradiation growth include:
If the two faces facing each other have different elongations in the longitudinal direction, bending may occur, which may affect the fuel combustion distribution. In addition, since the gap between the channel boxes 7 is an insertion passage for a control rod (not shown), It could affect the smooth operability of rod insertion.
【０００８】またチャンネルボックス７の内外の水圧
差、および中性子照射クリープ現象によりチャンネルボ
ックス７における４面が外側に膨らみを生じる。特に下
端部で発生した場合には、チャンネルボックス７とこの
チャンネルボックス７を下部タイプレート５に係止する
下部タイプレート５の図示しないフィンガスプリングと
の間隙が拡がり、炉心性能に影響するバイパスリークフ
ローが発生する可能性がある。Further, due to the difference in water pressure between the inside and outside of the channel box 7 and the neutron irradiation creep phenomenon, the four faces of the channel box 7 bulge outward. In particular, when it occurs at the lower end, the gap between the channel box 7 and a finger spring (not shown) of the lower tie plate 5 that locks the channel box 7 to the lower tie plate 5 expands, and a bypass leak flow that affects core performance is performed. May occur.
【０００９】本発明の目的とするところは、中性子照射
成長による曲がりの抑制と、膨らみによるバイパスリー
クフローの可能性の少ないチャンネルボックスを提供す
ることにある。[0009] It is an the onset bright object is to provide the suppression of bending by neutron irradiation growth, less channel box potentially bypass leakage flow by the bulge.
【００１０】[0010]
【課題を解決するための手段】複数本の燃料棒を燃料ス
ペーサを介在して整列配置し、これら燃料棒の両端部を
上部および下部タイプレートに固定して成る燃料棒束を
包囲するための燃料集合体のチャンネルボックスにおい
て、この発明は、チャンネルボックスの外周を形成する
面の全てに少なくとも一つの溶接線を長手方向全域に施
工し、前記溶接線のうちの少なくとも一つはダミー溶接
により形成することを特徴とする。SUMMARY OF THE INVENTION A plurality of fuel rods are arranged with fuel spacers interposed therebetween, and surround a fuel rod bundle having both ends fixed to upper and lower tie plates. In the channel box of the fuel assembly, the present invention provides that at least one welding line is applied to the entire surface forming the outer periphery of the channel box in the entire longitudinal direction, and at least one of the welding lines is a dummy welding line.
It is characterized by being formed by.
【００１１】[0011]
【作用】この発明は、外周面の全てに対する溶接線の施
工により中性子照射成長による伸びの差が低下する。こ
の結果チャンネルボックスの曲がり発生が改善される。[Action] This invention, the difference in elongation by neutron irradiation growth is reduced by application of weld lines for all of the outer peripheral surface. As a result, the occurrence of bending of the channel box is improved.
【００１２】[0012]
【実施例】本発明の一実施例を図面を参照して説明す
る。なお、上記した従来技術と同じ構成部分については
同一符号を付して詳細な説明を省略する。また図１にお
いて（ａ）と（ｂ）は、チャンネルボックスの夫々反対
方向から見た外観を示す。An embodiment of the present invention will be described with reference to the drawings. Incidentally, a detailed description thereof will be omitted In its One the same components as the prior art described above are denoted by the same reference numerals. Also we had you <br/> 1 and (a) (b) shows an appearance viewed from the respective opposite direction of Chi catcher down channel box.
【００１３】図１のチャンネルボックスの斜視図はこの
発明の一実施例を示すもので、チャンネルボックス13の
４面全てに長手方向全域の溶接線８を形成して構成して
いる。なお、この溶接線８のうち、２本は２枚のジルカ
ロイ板の両端を同方向に折曲げてコ字状とし、向かい合
う２つの面の中央に溶接線８が位置するような製造工程
上において形成された溶接線８であるが、他の２本はダ
ミー溶接による溶接線８である。[0013] perspective view of the channel box of Fig. 1 shows an embodiment of the invention this constitutes the four sides all of the channel box 13 to form a weld line 8 in the longitudinal direction throughout. In addition, two of the welding lines 8 are formed by bending both ends of two zircaloy plates in the same direction to form a U-shape, and in a manufacturing process in which the welding line 8 is located at the center of two opposing surfaces. The welding line 8 is formed, and the other two are welding lines 8 formed by dummy welding.
【００１４】この溶接線８を四角筒のチャンネルボック
ス13の各面に施すことにより、中性子照射成長の抑制が
図れ、互いに向かい合う面の照射成長の伸びの差により
発生するチャンネルボックス13の曲がりが解消されて、
制御棒挿入の円滑操作が可能となる効果がある。By applying the welding line 8 to each surface of the rectangular cylindrical channel box 13, neutron irradiation growth can be suppressed, and the bending of the channel box 13 caused by the difference in irradiation growth between surfaces facing each other can be eliminated. Being
There is an effect that the control rod can be smoothly inserted.
【００１５】[0015]
【発明の効果】以上本発明によれば、チャンネルボック
スにおける軸方向の曲がりの抑制が行える。軸方向曲が
りの改善によりチャンネルボックスの信頼性が向上する
と共に、制御棒の挿入性も向上できて、炉心の安全性の
向上も図れる。According to the present invention as described above, it allows curbing the bending of axially that put the channel box. By improving the bending in the axial direction, the reliability of the channel box is improved, the insertability of the control rod is also improved, and the safety of the core is improved.
【図１】本発明に係る一実施例を示すチャンネルボック
スの斜視図。 Perspective view of a channel box showing an embodiment engaging Ru in the present invention; FIG.
【図２】燃料集合体の一部切断斜視図。FIG. 2 is a partially cutaway perspective view of a fuel assembly.
１…燃料集合体、２…燃料棒、３…燃料スペーサ、４…
上部タイプレート、５…下部タイプレート、６…燃料
束、７，13…チャンネルボックス、８…溶接線、９…チ
ャンネルスペーサ、10…クリップ。 DESCRIPTION OF SYMBOLS 1 ... Fuel assembly, 2 ... Fuel rod, 3 ... Fuel spacer, 4 ...
The upper tie plate, 5 ... lower tie 6 ... fuel bundles, 7, 13 ... channel box, 8 ... welding wire, 9 ... channel spacer 10 ... clip.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G21C 3/30 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) G21C 3/30
Claims (1)
て整列配置し、これら燃料棒の両端部を上部および下部
タイプレートに固定して成る燃料棒束を包囲するための
燃料集合体のチャンネルボックスにおいて、外周を形成
する面の全てに少なくとも一つの溶接線を長手方向全域
に施工し、前記溶接線のうちの少なくとも一つはダミー
溶接により形成することを特徴とするチャンネルボック
ス。1. A fuel assembly for surrounding a fuel rod bundle comprising a plurality of fuel rods arranged in a line with a fuel spacer interposed therebetween and having both ends fixed to upper and lower tie plates. In the channel box, at least one welding line is applied to the entire surface forming the outer periphery in the entire longitudinal direction, and at least one of the welding lines is a dummy.
A channel box formed by welding .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34206892A JP3195084B2 (en) | 1992-12-22 | 1992-12-22 | Channel box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34206892A JP3195084B2 (en) | 1992-12-22 | 1992-12-22 | Channel box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06194476A JPH06194476A (en) | 1994-07-15 |
| JP3195084B2 true JP3195084B2 (en) | 2001-08-06 |
Family
ID=18350912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34206892A Expired - Fee Related JP3195084B2 (en) | 1992-12-22 | 1992-12-22 | Channel box |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3195084B2 (en) |
-
1992
- 1992-12-22 JP JP34206892A patent/JP3195084B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06194476A (en) | 1994-07-15 |
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| Date | Code | Title | Description |
|---|---|---|---|
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| LAPS | Cancellation because of no payment of annual fees |