JPS63120292A - Fuel aggregate - Google Patents
Fuel aggregateInfo
- Publication number
- JPS63120292A JPS63120292A JP61265448A JP26544886A JPS63120292A JP S63120292 A JPS63120292 A JP S63120292A JP 61265448 A JP61265448 A JP 61265448A JP 26544886 A JP26544886 A JP 26544886A JP S63120292 A JPS63120292 A JP S63120292A
- Authority
- JP
- Japan
- Prior art keywords
- fuel rods
- fuel
- short
- spacer
- rods
- 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
Links
- 239000000446 fuel Substances 0.000 title claims description 65
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002826 coolant Substances 0.000 description 8
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- Inert Electrodes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、短尺燃料棒を配設した燃料集合体の改良に係
り、特に燃料集合体の内部を通流する冷却材の圧力換失
を減少できるようにした燃料集合体に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of a fuel assembly in which short fuel rods are arranged, and in particular to improvement of a fuel assembly in which a coolant flows through the inside of the fuel assembly. This invention relates to a fuel assembly that can reduce pressure loss.
（従来の技術）
一般に沸騰水型原子炉の炉心は、複数の燃料集合体が等
間隔に配列されており、各燃料集合体は上下に配置され
たタイブレートの間に多数の燃料棒を挿着し、これらを
筒状の流路箱で覆っている。(Prior art) Generally, the core of a boiling water reactor has a plurality of fuel assemblies arranged at equal intervals, and each fuel assembly has a large number of fuel rods inserted between tie plates arranged above and below. These are covered with a cylindrical channel box.
ここに挿着された燃料棒は、通常、外径が１０数ミリ、
全長が数メートルと細長く形成されており、上下タイプ
レート間に挿着されるに際しては、燃料棒相互間及び燃
料棒と流路箱との間の間隔が数ミリメートルに設定され
る。運転時には、冷却材の流動ヤ熱膨張等によって燃料
棒相互間及び燃料棒と流路箱との間の間隔が設定値より
ずれ、安全運転をおびやかすおそれがあるので、通常は
、たとえば格子状に形成されたスペーサを上下方向に複
数段介在させて上記の間隔を保つようにしている。The fuel rod inserted here usually has an outer diameter of about 10 mm,
The fuel rods are elongated with a total length of several meters, and when inserted between the upper and lower tie plates, the spacing between the fuel rods and between the fuel rods and the channel box is set to several millimeters. During operation, the spacing between the fuel rods and between the fuel rods and the channel box may deviate from the set value due to coolant flow and thermal expansion, which may threaten safe operation. A plurality of formed spacers are interposed in the vertical direction to maintain the above-mentioned distance.
スペーサは、同一形状のリング型のセルを、各燃料棒の
配列されるべき位置にたとえば格子状に平面配置し、そ
れら相互間を連結して形成したものが用いられている。The spacer used is formed by arranging ring-shaped cells of the same shape in a plane, for example, in a lattice pattern at the positions where each fuel rod is to be arranged, and connecting these cells with each other.
（発明が解決しようとする問題点）
近年、燃料集合体の性能向上（低圧損、高燃焼度）をめ
ざして燃料集合体に数本の短い燃料棒（以下短尺燃料棒
）を挿入する短尺型燃料集合体の開発がすすめられてい
る。(Problem to be solved by the invention) In recent years, short fuel rods (hereinafter referred to as short fuel rods) are being introduced into a fuel assembly in order to improve the performance of the fuel assembly (low pressure loss, high burnup). Development of fuel assemblies is progressing.
しかしながら、短尺型燃料集合体のスペーサは、従来型
燃料集合体と同様に長手方向に沿って同じ形状のものを
使用している。However, the spacer of the short fuel assembly uses the same shape along the longitudinal direction as in the conventional fuel assembly.
長手方向に沿って同じ形状のものを使用すると、短尺燃
料棒の最上部以上では、燃料棒が存在しないにもかかわ
らず、その部分にセルが存在し流通する冷却材に対する
圧力損失を増大している。If the same shape is used along the longitudinal direction, even though there is no fuel rod above the top of the short fuel rod, cells exist in that part, increasing the pressure loss to the circulating coolant. There is.
本発明の目的は、流通冷却材の圧力損失を低減し、流動
安定性を改善することができる燃料集合体を提供するこ
とにある。An object of the present invention is to provide a fuel assembly that can reduce pressure loss of flowing coolant and improve flow stability.
［発明の構成］
（問題点を解決するための手段）
本発明においては、束状に配列された複数の燃料棒と、
これら燃料棒の一部を構成するとともにその上部の一部
が欠落してなる短尺燃料棒と、各燃料棒の配列間隔を規
制づる千日を有して燃料棒の軸方向に分散して配設され
たスペーサとを有す（作 用）
燃料集合体内で、短尺燃料棒の上方にある空間において
は、スペーサの形状が異なるため、燃料集合体内を流通
する冷却材の流動安定性が改善される。[Structure of the Invention] (Means for Solving the Problems) In the present invention, a plurality of fuel rods arranged in a bundle,
These short fuel rods constitute a part of the fuel rods and have their upper parts missing, and the short fuel rods are distributed in the axial direction of the fuel rods with 1,000 days regulating the arrangement interval of each fuel rod. (Function) In the space above the short fuel rods in the fuel assembly, the shape of the spacer is different, so the flow stability of the coolant flowing in the fuel assembly is improved. Ru.
（実施例）
以下本発明の一実施例を第１図乃至第３図を用いて説明
する。(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3.
第３図において断面が４角枠状に形成された筒状の流路
箱１内に複数本の燃料棒２が挿着されており、燃料棒２
の下部は下部タイブレート３により、上部は上部タイプ
レート４によって固定されている。燃料棒２は通常数十
本が格子状に配列されているが、その内数本は特定の位
置に配置された短尺燃料棒２Ａであって、これらの短尺
燃料棒は上部タイプレート４まで到達しない長さとなっ
ている。In FIG. 3, a plurality of fuel rods 2 are inserted into a cylindrical channel box 1 having a rectangular frame shape in cross section.
Its lower part is fixed by a lower tie plate 3, and its upper part is fixed by an upper tie plate 4. Usually, dozens of fuel rods 2 are arranged in a lattice pattern, and some of them are short fuel rods 2A placed at specific positions, and these short fuel rods reach up to the upper tie plate 4. It has a long length.
下部タイブレート３と上部タイプレート４の間には、各
燃料棒相互間、および燃料棒と流路箱１ア
間の間隔寸法を規制するスペーサが例えば十箇程度設け
られる。これらのスペーサは短尺燃料棒２Ａが存在する
部分、例えば下部タイブレート３に近い方の４Ｂのスペ
ーサ５Ａに対し、短尺燃料棒の上端以上の部分に位置す
る例えば３箇のスベと
一す５Ｂは形状台異ならせである。なお同図中符号６は
燃料集合体の吊下等に用いられるハンドルでおる。For example, about ten spacers are provided between the lower tie plate 3 and the upper tie plate 4 to regulate the distance between the fuel rods and between the fuel rods and the channel box 1a. These spacers are located in the part where the short fuel rod 2A is present, for example, the spacer 5A in 4B near the lower tie plate 3, whereas the shape of the spacer 5B in the part above the upper end of the short fuel rod, for example, is different. The machine is different. The reference numeral 6 in the figure is a handle used for hanging the fuel assembly.
スペーサ５Ａは、第２図のその開端の一部を表す平面図
によって示されるように、枠体７の内にリング８・・・
を主体とするセルを格子状に配列したものであって、各
リング８は内方に凸出させた２箇のタブ９と、隣接する
リング８間に挟着されたスプリング１０によって燃料棒
２、あるいは短尺燃料棒２Ａの側面に当接させ、これら
の位置を規制している。The spacer 5A has a ring 8...
Each ring 8 has two inwardly projecting tabs 9 and a spring 10 sandwiched between adjacent rings 8 to support the fuel rods 2. , or the short fuel rods 2A are brought into contact with the side surfaces of the short fuel rods 2A to regulate their positions.
スペーサ５Ｂは、第１図のその開端の一部を表す平面図
によって示されるようになっており、スペーサ５Ａと異
なる点は、短尺燃料棒２Ａの直上に当る部分のリング８
を欠落させて構成されていることである。この場合欠落
部分に隣接するリング８のスプリングＩＯＡは、そのリ
ング８に溶接して固定されている。The spacer 5B is shown in a plan view showing a part of its open end in FIG.
It is constructed by omitting the . In this case, the spring IOA of the ring 8 adjacent to the missing portion is fixed to the ring 8 by welding.
原子炉運転時、冷却材は燃料集合体内を上方に流れ、燃
料棒２および短尺燃料棒２Ａの核反応による発熱により
加熱されるが、短尺燃料棒２Ａの上方空間にはセルが存
在しないので無用の圧力損失増加は回避される。During reactor operation, the coolant flows upward within the fuel assembly and is heated by the heat generated by the nuclear reaction between the fuel rods 2 and the short fuel rods 2A, but it is useless because there are no cells in the space above the short fuel rods 2A. Increase in pressure loss is avoided.
本発明によれば、流通冷却材の燃料集合体内における圧
力損失を低下させ、流動安定性の余裕度を増大させるこ
とができるばかりでなく、冷却材循環ポンプを小容伍と
することができる。According to the present invention, it is possible not only to reduce the pressure loss of the circulating coolant in the fuel assembly and increase the margin of flow stability, but also to reduce the size of the coolant circulation pump.
第１図および第２図は本発明の一実施例の要部を示す平
面図、第３図は第１図および第２図のスペーサを適用し
た燃料集合体の一部を切欠いて示す斜視図でおる。
２・・・燃料棒 ２Ａ・・・短尺燃料棒５
Ａ、５Ｂ・・・スペーサ ７・・・枠体８・・・リン
グ ９・・・タブ１０、１０Ｂ・・・スプ
リング
代理人 弁理士 則 近 憲 佑
同 三俣弘文
第 ｌ 図
第 ２ 図
第 ３ 図1 and 2 are plan views showing essential parts of an embodiment of the present invention, and FIG. 3 is a partially cutaway perspective view of a fuel assembly to which the spacers shown in FIGS. 1 and 2 are applied. I'll go. 2...Fuel rod 2A...Short fuel rod 5
A, 5B...Spacer 7...Frame 8...Ring 9...Tabs 10, 10B...Spring agent Patent attorney Norihiko Ken Yudo Hirofumi Mitsumata No. 1 Figure 2 Figure 3
Claims (1)
一部を構成するとともにその上部の一部が欠落してなる
短尺燃料棒と、前記各燃料棒の配列間隔を規制する手段
を有して前記燃料棒の軸方向に分散して配設されたスペ
ーサとを有する燃料集合体において前記短尺燃料棒の上
端より下方に配設される前記スペーサと、同じく上端よ
り上方に配設される前記スペーサとの形状を異ならせて
なることを特徴とする燃料集合体。 ２、前記上方に配設される前記スペーサは、前記下方に
配設される前記スペーサの前記短尺燃料棒の配列位置に
該当する位置のセルを除去したものとした特許請求の範
囲第１項記載の燃料集合体。[Scope of Claims] 1. A plurality of fuel rods arranged in a bundle, short fuel rods forming part of these fuel rods and having their upper portions missing, and each of the fuel rods comprising: The spacers disposed below the upper ends of the short fuel rods in a fuel assembly having spacers disposed dispersedly in the axial direction of the fuel rods and having means for regulating arrangement intervals; A fuel assembly characterized in that the shape of the spacer is different from that of the spacer disposed above the upper end. 2. The spacer disposed above has cells removed from the spacer disposed below at a position corresponding to the arrangement position of the short fuel rods. fuel assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61265448A JPS63120292A (en) | 1986-11-10 | 1986-11-10 | Fuel aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61265448A JPS63120292A (en) | 1986-11-10 | 1986-11-10 | Fuel aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63120292A true JPS63120292A (en) | 1988-05-24 |
Family
ID=17417296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61265448A Pending JPS63120292A (en) | 1986-11-10 | 1986-11-10 | Fuel aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63120292A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0395486A (en) * | 1989-07-03 | 1991-04-19 | General Electric Co <Ge> | Fuel assembly for two-phase pressure fall reduction type boiling water reactor |
| EP0692794A1 (en) * | 1994-07-12 | 1996-01-17 | General Electric Company | Nuclear fuel bundle with spacers of different configurations |
| JP2002533689A (en) * | 1998-12-18 | 2002-10-08 | シーメンス アクチエンゲゼルシヤフト | Fuel assemblies for boiling water reactors. |
| EP2306466A1 (en) * | 2009-10-02 | 2011-04-06 | Global Nuclear Fuel-Americas, LLC | Fuel bundle designs using mixed spacer types |
-
1986
- 1986-11-10 JP JP61265448A patent/JPS63120292A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0395486A (en) * | 1989-07-03 | 1991-04-19 | General Electric Co <Ge> | Fuel assembly for two-phase pressure fall reduction type boiling water reactor |
| EP0692794A1 (en) * | 1994-07-12 | 1996-01-17 | General Electric Company | Nuclear fuel bundle with spacers of different configurations |
| JP2002533689A (en) * | 1998-12-18 | 2002-10-08 | シーメンス アクチエンゲゼルシヤフト | Fuel assemblies for boiling water reactors. |
| EP2306466A1 (en) * | 2009-10-02 | 2011-04-06 | Global Nuclear Fuel-Americas, LLC | Fuel bundle designs using mixed spacer types |
| US8509377B2 (en) | 2009-10-02 | 2013-08-13 | Global Nuclear Fuel—Americas, LLC | Fuel bundle designs using mixed spacer types |
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