JPH0432795A - Fuel assembly - Google Patents
Fuel assemblyInfo
- Publication number
- JPH0432795A JPH0432795A JP2138366A JP13836690A JPH0432795A JP H0432795 A JPH0432795 A JP H0432795A JP 2138366 A JP2138366 A JP 2138366A JP 13836690 A JP13836690 A JP 13836690A JP H0432795 A JPH0432795 A JP H0432795A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- fuel rod
- cells
- rods
- fuel assembly
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 77
- 125000006850 spacer group Chemical group 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 abstract description 10
- 239000002826 coolant Substances 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 2
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003756 stirring 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
- Fuel Cell (AREA)
Abstract
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、多数の燃料棒を燃料果合体の外枠内に整列支
持する燃料棒スペーサを有する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 a fuel assembly having fuel rod spacers that align and support a large number of fuel rods within an outer frame of the fuel assembly.
（従来の技術）
一般に、原子炉の炉心部には、多数の燃料集合体が収納
されている。この燃料集合体は１例えば第４図に示すよ
うに、二酸化ウラン（ＵＯ２）ペレットを封入したジル
カロイ合金製の被覆管から成る多数の燃料棒１と、冷却
材を確保するだめの中空のウォータロッド２と、燃料棒
１及びウォータロッド２の上下端部を支持固定する−１
一部タイブレート３及び下部タイブレート４と、燃料棒
１に整列支持し冷却材流路を確保する燃料棒スペーサ５
ａとから構成され、さらに、この燃料集合体は断面略正
方形の外枠（チャンネルボックス）６内に収納されてい
る。(Prior Art) Generally, a large number of fuel assemblies are housed in the core of a nuclear reactor. For example, as shown in Fig. 4, this fuel assembly consists of a large number of fuel rods 1 made of cladding tubes made of Zircaloy alloy containing uranium dioxide (UO2) pellets, and hollow water rods for securing coolant. 2, and -1 which supports and fixes the upper and lower ends of the fuel rod 1 and water rod 2.
A partial tie plate 3, a lower tie plate 4, and a fuel rod spacer 5 that aligns and supports the fuel rod 1 to ensure a coolant flow path.
Further, this fuel assembly is housed in an outer frame (channel box) 6 having a substantially square cross section.
ところで、燃料棒スペーサ５ａの設計においては燃料棒
間隔の確保、燃料捧熱膨歴余裕と燃料棒との接地面積の
最小化、冷却材流動の変化の最小化、熱的な余裕の最大
化、派生する中性子吸収の最小化、原子炉運転時の耐機
械的強度および燃料集合体組立の容易さ等からなる各事
項を総合的に考慮しなければならない。By the way, in the design of the fuel rod spacer 5a, it is necessary to ensure the spacing between the fuel rods, minimize the fuel heat expansion margin and the contact area between the fuel rods, minimize the change in coolant flow, maximize the thermal margin, Various matters must be comprehensively considered, including minimization of derived neutron absorption, mechanical strength during reactor operation, and ease of assembling the fuel assembly.
このような設計事項に応えるために従来から種々の燃料
棒スペーサが提案されてきた。Various fuel rod spacers have been proposed in the past in order to meet such design requirements.
その代表例として特開昭５９−６５２８７号に示された
燃料棒スペーサを第５図および第６図に示す。As a representative example, a fuel rod spacer disclosed in Japanese Patent Application Laid-Open No. 59-65287 is shown in FIGS. 5 and 6.
第５図に示すように、燃料棒スペーサ５ａは断面略正方
形状に形成された外枠７内に燃料棒通路８を形成し互い
に結合された突起部を有する断面略円形のセル９が配列
されている。このように隣接したセル９の２つの側面部
には第５図の平面図及び第６図の一部切断側面図に示す
ように、スプリング１０が配設されている。この外枠７
及びセル９は中性子吸収断面積の小さい材料から構成さ
れている。そして、このセル９の構造は第７図に示すよ
うに、基本セル１２が略円形をなしており、スプリング
（図示せず）を保持するための開口部１３と燃料棒を接
触保持するための打出し１１を有している。また、他の
従来のセルとしては第８図に示すように略式角形の横断
面瑣を有するセル９ｂがある。As shown in FIG. 5, the fuel rod spacer 5a has a fuel rod passage 8 formed in an outer frame 7 having a substantially square cross section, and cells 9 having a substantially circular cross section having protrusions connected to each other are arranged. ing. As shown in the plan view of FIG. 5 and the partially cutaway side view of FIG. 6, springs 10 are disposed on two side surfaces of the adjacent cells 9. This outer frame 7
The cell 9 is made of a material with a small neutron absorption cross section. As shown in FIG. 7, the structure of this cell 9 is such that a basic cell 12 has a substantially circular shape, and an opening 13 for holding a spring (not shown) and an opening 13 for holding a fuel rod in contact with each other. It has a launch 11. Another conventional cell is a cell 9b having a roughly rectangular cross section as shown in FIG.
そして図示しないチャンネルボックス内に燃料棒通路８
ｂを形成し、隣接したセル９ｂの２つの側面部にはスプ
リング１０ｂが配設されている。A fuel rod passage 8 is provided in a channel box (not shown).
springs 10b are arranged on two side surfaces of adjacent cells 9b.
特に、上記したように独立したセル９ａから成る燃料棒
スペーサ５ａはスペーサ構成部材による冷却材流路の閉
鎖を避け、また、セル９ａの垂直方向の断面形状の変化
を制限することにより燃料棒スペーサ５ａを通過する際
の冷却材の流れの大きな変化を抑えるように構成されて
おり、これにより燃料棒スペーサ５ａ部での圧力損失の
増加を抑え、また燃料集合体の限界出力を増加させてい
る。In particular, the fuel rod spacer 5a consisting of the independent cells 9a as described above avoids the closure of the coolant flow path by the spacer components, and also limits the change in the vertical cross-sectional shape of the cells 9a. The structure is configured to suppress large changes in the flow of coolant when passing through the fuel rod spacer 5a, thereby suppressing an increase in pressure loss at the fuel rod spacer 5a, and increasing the limit output of the fuel assembly. .
（発明が解決しようとする課題）
しかしながら、燃料集合体の出力が限界出力に達したと
き、即ち、燃料棒表面を流れる冷却材液膜流れが消失し
たとき（通常この状態をドライアウトと呼ぶ）において
も、蒸気流には液滴がまだ多量に含まれており、この液
滴が燃料棒の冷却に有効に利用されていない。その結果
、原子炉出力はこの燃料集合体の限界出力に余裕を持っ
て運転するという制約を受けている。(Problem to be solved by the invention) However, when the output of the fuel assembly reaches the limit output, that is, when the flow of the coolant liquid film flowing on the fuel rod surface disappears (this state is usually called dryout). Even in this case, the vapor stream still contains a large amount of droplets, and these droplets are not effectively used to cool the fuel rods. As a result, the reactor output is constrained to operate within the limit output of this fuel assembly.
本発明は、上記事情に鑑みてなされたもので、その目的
は、限界出力を向上した燃料棒スペーサを有する燃料集
合体を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to provide a fuel assembly having fuel rod spacers with improved limit output.
（課題を解決するための手段）
本発明は、上記目的を達成するために、燃料集合体を構
成する多数の燃料棒を整列支持する燃料棒スペーサを、
前記外枠内に前記燃料棒通路を形成する互いに結合され
た複数個の突起部を有する略円形のセルから構成し、さ
らに隣接した前記セルの壁に２つの側面を持っ板ばねを
設けるとともに前記セルの上端を燃料棒側に折り曲げた
構成となっている。(Means for Solving the Problems) In order to achieve the above object, the present invention provides fuel rod spacers that align and support a large number of fuel rods constituting a fuel assembly.
The fuel rod passage is formed in the outer frame by a substantially circular cell having a plurality of protrusions coupled to each other, and the wall of the adjacent cell is further provided with a leaf spring having two side surfaces. The upper end of the cell is bent toward the fuel rod side.
（作 用）
このように構成された燃料集合体においては、燃料棒ス
ペーサ内を流通する液滴がセルに形成された押し曲げ部
によって燃料棒表面に吹き付けられる。よって、燃料棒
表面に液膜を形成することができ、燃料棒の焼損等を防
止することができるので限界出力を高くすることができ
る。(Function) In the fuel assembly configured in this manner, droplets flowing within the fuel rod spacers are sprayed onto the fuel rod surfaces by the pressing and bending portions formed in the cells. Therefore, a liquid film can be formed on the surface of the fuel rod, and burnout of the fuel rod can be prevented, so that the limit output can be increased.
（実施例） 本発明の一実施例を図面を参照して説明する。(Example) An embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の横断面図、第２図は本発明
の作用の原理説明図である。なお、第１図、第２図にお
いて、第４図から第８図と同一部分には同一符号を付し
、その部分の構成の説明は省斃する。これらの図面に示
すように燃料棒スペーサを構成するセル１９はその上端
部に燃料棒１の方向へ押し曲げられた凹部２０が形成さ
れている。FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a diagram illustrating the principle of operation of the present invention. In FIGS. 1 and 2, the same parts as in FIGS. 4 to 8 are designated by the same reference numerals, and a description of the structure of the parts will be omitted. As shown in these drawings, the cells 19 constituting the fuel rod spacers have recesses 20 bent toward the fuel rods 1 at their upper ends.
そしてこの凹部２０によって、冷却材の流れ内の液滴１
５を燃料棒１の方向に押し付は燃料棒表面の液膜１６に
図中の矢印の方向で示すように吹き付ける。This recess 20 then allows the droplet 1 in the flow of coolant to
5 in the direction of the fuel rod 1, the liquid film 16 on the surface of the fuel rod is sprayed in the direction of the arrow in the figure.
これにより燃料棒の発熱による蒸発で徐々に減少してゆ
く液膜１６を補充することが出来、従来無駄になってい
た蒸気流中の液滴１５を有効利用出来、その結果、限界
出力の高い燃料集合体とすることが出来る。第３図（ａ
）、 （ｂ）は本発明の他の実施例に係るセル２１の斜
視図及び平面図である。This makes it possible to replenish the liquid film 16, which gradually decreases due to evaporation due to the heat generated by the fuel rods, and makes effective use of the liquid droplets 15 in the vapor flow, which were previously wasted.As a result, the limit output is high. It can be used as a fuel assembly. Figure 3 (a
) and (b) are a perspective view and a plan view of a cell 21 according to another embodiment of the present invention.
本実施例では、セル２１の上端部２２を支持する燃料棒
１の方向に折り曲げる際に切り欠き１４を例えば第３図
の例では４個設け、その片側だけを内側（燃料棒１側）
に曲げたものである。このような構成にすることにより
セルの加工が容易となると共に、冷却材の流れを撹拌す
る効果が生まれ、より限界出力の高い燃料集合体とする
ことが出来る。In this embodiment, when bending the upper end portion 22 of the cell 21 in the direction of the supporting fuel rod 1, four notches 14 are provided, for example in the example shown in FIG.
It is bent to Such a configuration not only facilitates cell processing, but also produces an effect of stirring the coolant flow, making it possible to obtain a fuel assembly with a higher limit output.
以上説明したように１本発明の燃料棒スペーサを用いた
燃料集合体によれば、限界出力が高く、熱的余裕が大き
くなり、原子炉の出力を高くするあるいはより安全な原
子炉とすることが出来る。As explained above, 1. According to the fuel assembly using the fuel rod spacer of the present invention, the limit power is high and the thermal margin is large, so that the power of the reactor can be increased or the reactor can be made safer. I can do it.
第１図は本発明の燃料集合体を構成する燃料棒スペーサ
の要部を示すセルの縦断面図、第２図は本発明の効果の
原理を示す説明図、第３図（ａ）および（ｂ）は本発明
の他の実施例の要部を示すセルの斜視図及び平面図、第
４図は従来の燃料集合体の斜視図、第５図および第６図
はそれぞれ第４図に示した燃料棒スペーサの平面図およ
び側面図。
第７図は第６図に示したセルの斜視図、第８図は他の従
来例を示すセルの平面図である。
５・・・燃料棒スペーサ
７・・・外枠
８・・・燃料棒通路
９ 、１９．２１・・・セル
１０・・・スプリング
２０・・・凹部FIG. 1 is a longitudinal sectional view of a cell showing the main parts of a fuel rod spacer constituting a fuel assembly of the present invention, FIG. 2 is an explanatory diagram showing the principle of the effect of the present invention, and FIGS. 3(a) and ( b) is a perspective view and a plan view of a cell showing essential parts of another embodiment of the present invention, FIG. 4 is a perspective view of a conventional fuel assembly, and FIGS. 5 and 6 are respectively shown in FIG. FIG. 3 is a top view and a side view of a fuel rod spacer. FIG. 7 is a perspective view of the cell shown in FIG. 6, and FIG. 8 is a plan view of another conventional cell. 5...Fuel rod spacer 7...Outer frame 8...Fuel rod passage 9, 19.21...Cell 10...Spring 20...Concavity
Claims (1)
料棒スペーサを有する燃料集合体において、前記燃料棒
スペーサは、前記チャンネルボックス内に前記燃料棒通
路を形成する互いに結合された複数個の突起部を有する
略円形のセルから構成され、隣接した前記セルの壁に２
つの側面を持つ板ばねを設けるとともに、前記セルの上
端を燃料棒側に折り曲げて成ることを特徴とする燃料集
合体。In a fuel assembly having a fuel rod spacer that aligns and supports a large number of fuel rods in a channel box, the fuel rod spacer has a plurality of protrusions connected to each other that form the fuel rod passages in the channel box. It is composed of approximately circular cells with two walls on the walls of adjacent cells.
1. A fuel assembly characterized in that a leaf spring having two side surfaces is provided, and the upper ends of the cells are bent toward the fuel rod side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138366A JP2989220B2 (en) | 1990-05-30 | 1990-05-30 | Fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138366A JP2989220B2 (en) | 1990-05-30 | 1990-05-30 | Fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0432795A true JPH0432795A (en) | 1992-02-04 |
| JP2989220B2 JP2989220B2 (en) | 1999-12-13 |
Family
ID=15220253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2138366A Expired - Fee Related JP2989220B2 (en) | 1990-05-30 | 1990-05-30 | Fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989220B2 (en) |
-
1990
- 1990-05-30 JP JP2138366A patent/JP2989220B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2989220B2 (en) | 1999-12-13 |
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