JPH056556Y2 - - Google Patents
Info
- Publication number
- JPH056556Y2 JPH056556Y2 JP1986054478U JP5447886U JPH056556Y2 JP H056556 Y2 JPH056556 Y2 JP H056556Y2 JP 1986054478 U JP1986054478 U JP 1986054478U JP 5447886 U JP5447886 U JP 5447886U JP H056556 Y2 JPH056556 Y2 JP H056556Y2
- Authority
- JP
- Japan
- Prior art keywords
- lower nozzle
- nozzle
- fuel assembly
- core plate
- notch
- 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 - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims description 17
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008188 pellet Substances 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
- Supports For Pipes And Cables (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
本考案は、下部ノズルを脚部を下部炉心板に突
設された位置決めピンに係合する構造の燃料集合
体に関する。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a fuel assembly having a structure in which a leg of a lower nozzle is engaged with a positioning pin protruding from a lower core plate.
「従来の技術」
一般に、この種の燃料集合体は、第５図に示す
ように、上下に離間されて配設された上部ノズル
１及び下部ノズル２と、これらの間に所定の間隔
をおいて配設され、ストラツプにより形成された
格子空間を有する複数の支持格子３と、この支持
格子３の格子空間内に所定の間隔をおいて挿通さ
れ、かつ支持格子３の固定部により固定され、さ
らにそれぞれの上下端部を上部ノズル１、下部ノ
ズル２に連結された制御棒案内管４と、被覆管５
内に密封された多数の燃料ペレツト６と押さえば
ね７とを有し、支持格子３の所定の格子空間内に
挿通され、支持格子３の支持部により弾力的に支
持された多数の燃料棒８とから構成されたもので
ある。``Prior Art'' In general, this type of fuel assembly, as shown in FIG. A plurality of support grids 3 are disposed in the grid and have grid spaces formed by straps, and the straps are inserted into the grid spaces of the support grids 3 at predetermined intervals and are fixed by the fixing portions of the support grids 3. Furthermore, a control rod guide tube 4 and a cladding tube 5 are connected at their upper and lower ends to the upper nozzle 1 and the lower nozzle 2, respectively.
A large number of fuel rods 8 have a large number of fuel pellets 6 sealed therein and a presser spring 7, are inserted into a predetermined lattice space of the support lattice 3, and are elastically supported by the support portions of the support lattice 3. It is composed of.
ところで、従来、上記燃料集合体は、第６図と
第７図に示すように、その下部ノズル２の隅部に
設けられた脚部２ａの係止穴２ｂに、下部炉心板
９の上面に突出して設けられた位置決めピン１０
を挿入することにより、位置決めされるようにな
つている。 By the way, conventionally, as shown in FIGS. 6 and 7, in the fuel assembly, the upper surface of the lower core plate 9 is fitted into the locking hole 2b of the leg 2a provided at the corner of the lower nozzle 2. Protruding positioning pin 10
It is designed to be positioned by inserting the .
「考案が解決しようとする問題点」
しかしながら、上記のように燃料集合体の下部
ノズル２の脚部２ａに形成された係止穴２ｂに下
部炉心板９の位置決めピン１０を係合して燃料集
合体の位置決めを行なう場合には、上記係止穴２
ｂの面取り部２ｃの寸法により、センタリング範
囲が限定されるため、十分な余裕がなく、位置決
め作業が難しいという問題がある。"Problems to be Solved by the Invention" However, as described above, the positioning pins 10 of the lower core plate 9 are engaged with the locking holes 2b formed in the legs 2a of the lower nozzle 2 of the fuel assembly. When positioning the assembly, use the locking hole 2
Since the centering range is limited by the dimensions of the chamfered portion 2c of b, there is a problem that there is not enough margin and positioning work is difficult.
本考案は、上記事情に鑑みてなされたもので、
その目的とするところは、センタリング範囲を大
きく広げることができ、位置決め作業を行ない易
い燃料集合体を提供することにある。 This invention was made in view of the above circumstances,
The purpose is to provide a fuel assembly that can greatly expand the centering range and facilitates positioning work.
「問題点を解決するための手段」
上記目的を達成するために、本考案は、下部ノ
ズルの少なくとも一対の対角位置にある脚部の外
側縁部に、上方にいくほど先細る形状の切欠部を
形成し、かつこの切欠部に下部炉心板に突設され
た位置決めピンを係合したものである。"Means for Solving the Problem" In order to achieve the above object, the present invention provides a notch in the outer edge of at least one pair of diagonally located legs of the lower nozzle that tapers upward. A positioning pin protruding from the lower core plate is engaged with this notch.
「作用」
本考案の燃料集合体にあつては、下部ノズルの
脚部に形成された切欠部の傾斜面に沿つて下部炉
心板の位置決めピンの先端を導き入れることによ
つて、切欠部と位置決めピンとを係合して、円滑
に位置決めを行なう。"Operation" In the fuel assembly of the present invention, the tip of the positioning pin of the lower core plate is guided along the slope of the notch formed in the leg of the lower nozzle, thereby forming the notch. Smooth positioning is achieved by engaging the positioning pin.
「実施例」
以下、第１図ないし第３図に基づいて本考案の
一実施例を説明する。なお、本実施例にあつて
は、第５図に示す上記従来例の下部ノズル２の代
わりに、新規の構成の下部ノズル２０を設けたも
ので、その他の構成は同様なので説明を省略す
る。"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 3. In this embodiment, a lower nozzle 20 of a new configuration is provided in place of the lower nozzle 2 of the conventional example shown in FIG. 5, and the other configurations are the same, so a description thereof will be omitted.
上記下部ノズル２０は、第１図ないし第３図に
示すように、ノズル本体２１の下面４隅に脚部２
２がそれぞれ形成されており、これらの脚部２２
のうち対角位置にある一対の脚部２２には、その
外縁側に下方から上方にかけて先細る状態で曲面
状の切欠部２３が形成されている。また、図中符
号２４は下部炉心板であり、この下部炉心板２４
には、適宜位置に燃料集合体位置決め用の位置決
めピン２５が突設されている。この位置決めピン
２５は、円柱形状の先端部が円錐状に形成されて
おり、この円錐状部２６が上記切欠部２３に嵌め
合う形態で係合するようになつている。 As shown in FIGS. 1 to 3, the lower nozzle 20 has legs 2 at four corners of the lower surface of the nozzle body 21.
2 are formed respectively, and these leg portions 22
A curved notch 23 is formed in a pair of diagonally located leg portions 22 on the outer edge thereof, tapering from the bottom to the top. Further, the reference numeral 24 in the figure is a lower core plate, and this lower core plate 24
Positioning pins 25 for positioning the fuel assembly are protrudingly provided at appropriate positions. The positioning pin 25 has a cylindrical tip end formed into a conical shape, and this conical portion 26 is adapted to fit into the notch 23 .
上記のように構成された燃料集合体を原子炉に
装荷する際には、下降しつつある燃料集合体の下
部ノズル２０の４つの脚部２２のうち対角位置に
ある２つの脚部２２に形成された切欠部２３を下
部炉心板２４上に突設している位置決めピン２５
に合わせて位置決め載置する。この場合、上記脚
部２２に形成された切欠部２３が、該脚部２２の
外側縁部に設けられ、しかも下方に向かつて広が
る形態で形成されているから、そのセンタリング
範囲Ａが従来例の係止穴２ｂの面取り部２ｃに比
べて格段に広く、従つて、燃料集合体の位置決め
作業が容易に行なえる。そして、１本の位置決め
ピン２５の回りには、４つの脚部２２の切欠部２
３で円錐状の凹所２７が構成され、該凹所２７と
位置決めピン２５とが嵌め合つて位置決めされ
る。 When loading the fuel assembly configured as described above into a nuclear reactor, two diagonally located legs 22 of the four legs 22 of the lower nozzle 20 of the descending fuel assembly are loaded. A positioning pin 25 having a cutout 23 projecting from the lower core plate 24
Position and place it accordingly. In this case, the notch 23 formed in the leg 22 is provided at the outer edge of the leg 22 and widens downward, so that the centering range A is different from that of the conventional example. It is much wider than the chamfered portion 2c of the locking hole 2b, and therefore the positioning work of the fuel assembly can be easily performed. Then, around one positioning pin 25, there are four notches 2 of the legs 22.
3 constitutes a conical recess 27, and the positioning pin 25 is fitted into the recess 27 for positioning.
なお、上記実施例において、脚部２２に形成さ
れる切欠部２３は、第３図に示すように、下部ノ
ズル２０の一対の対角位置にある脚部２２に設け
られた形態で説明したが、これらに限られること
なく、第４図に示すように、４隅にある全ての脚
部に切欠部を形成してもよい。 In the above embodiment, the notches 23 formed in the leg portions 22 were described as being provided in the leg portions 22 at a pair of diagonal positions of the lower nozzle 20, as shown in FIG. However, the present invention is not limited to these, and as shown in FIG. 4, cutouts may be formed in all the legs at the four corners.
「考案の効果」
以上説明したように、本考案によれば、下部ノ
ズルの少なくとも一対の対角位置にある脚部の外
側縁部に、上方にいくほど先細る形状の切欠部を
形成し、かつこの切欠部に下部炉心板に突設され
た位置決めピンを係合したものであるから、下部
ノズルの脚部に形成された切欠部の傾斜面に沿つ
て下部炉心板の位置決めピンの先端を導き入れる
ことによつて、センタリング範囲を大きく広げる
ことができて、切欠部と位置決めピンとを容易に
係合でき、速やかにかつ円滑に位置決めができて
位置決め作業が行ない易いという効果を有する。"Effects of the Invention" As explained above, according to the present invention, notches tapered upward are formed on the outer edges of at least one pair of diagonally located legs of the lower nozzle, In addition, since the positioning pin protruding from the lower core plate is engaged with this notch, the tip of the positioning pin of the lower core plate is inserted along the slope of the notch formed in the leg of the lower nozzle. By introducing it, the centering range can be greatly expanded, the notch and the positioning pin can be easily engaged, and the positioning can be performed quickly and smoothly, making the positioning work easier.
第１図ないし第３図は本考案の一実施例を示す
もので、第１図は斜視図、第２図は側面図、第３
図は第２図の−線に沿う断面図、第４図は本
考案の他の実施例を示す断面図、第５図ないし第
７図は従来の燃料集合体を示すもので、第５図は
全体を示す概略構成図、第６図は脚部の斜視図、
第７図は脚部の断面図である。
１……上部ノズル、２……下部ノズル、３……
支持格子、４……制御棒案内管、８……燃料棒、
９……下部炉心板、１０……位置決めピン、２ａ
……脚部、２０……下部ノズル、２２……脚部、
２３……切欠部、２４……下部炉心板、２５……
位置決めピン。
Figures 1 to 3 show one embodiment of the present invention, where Figure 1 is a perspective view, Figure 2 is a side view, and Figure 3 is a side view.
The figure is a sectional view taken along the - line of FIG. 2, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIGS. 5 to 7 show conventional fuel assemblies. is a schematic configuration diagram showing the whole, FIG. 6 is a perspective view of the legs,
FIG. 7 is a sectional view of the leg. 1... Upper nozzle, 2... Lower nozzle, 3...
Support grid, 4... Control rod guide tube, 8... Fuel rod,
9... Lower core plate, 10... Positioning pin, 2a
... Leg part, 20 ... Lower nozzle, 22 ... Leg part,
23... Notch, 24... Lower core plate, 25...
Positioning pin.
Claims (1)
に制御棒案内管及び燃料棒を挿通し、上記制御棒
案内管の両端にそれぞれ下部ノズル及び上部ノズ
ルを取付け、かつ上記下部ノズルの脚部を下部炉
心板に突設された位置決めピンに係合してなる燃
料集合体において、上記下部ノズルの少なくとも
一対の対角位置にある脚部の外側縁部に、上方に
いくほど先細る形状の切欠部を形成したことを特
徴とする燃料集合体。 A control rod guide tube and a fuel rod are inserted through a plurality of support grids arranged at predetermined intervals, a lower nozzle and an upper nozzle are respectively attached to both ends of the control rod guide tube, and a leg of the lower nozzle is installed. In a fuel assembly formed by engaging positioning pins protruding from the lower core plate, the outer edges of at least one pair of diagonally opposite legs of the lower nozzle are provided with a shape that tapers upwardly. A fuel assembly characterized by forming a notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986054478U JPH056556Y2 (en) | 1986-04-11 | 1986-04-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986054478U JPH056556Y2 (en) | 1986-04-11 | 1986-04-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62165599U JPS62165599U (en) | 1987-10-21 |
| JPH056556Y2 true JPH056556Y2 (en) | 1993-02-19 |
Family
ID=30881510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986054478U Expired - Lifetime JPH056556Y2 (en) | 1986-04-11 | 1986-04-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH056556Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569090A (en) * | 1978-11-13 | 1980-05-24 | Combustion Eng | Nuclear fuel assembly |
| JPS59137887A (en) * | 1983-01-13 | 1984-08-08 | ウエスチングハウス エレクトリツク コ−ポレ−シヨン | Nuclear fuel assembly |
-
1986
- 1986-04-11 JP JP1986054478U patent/JPH056556Y2/ja not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569090A (en) * | 1978-11-13 | 1980-05-24 | Combustion Eng | Nuclear fuel assembly |
| JPS59137887A (en) * | 1983-01-13 | 1984-08-08 | ウエスチングハウス エレクトリツク コ−ポレ−シヨン | Nuclear fuel assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62165599U (en) | 1987-10-21 |
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