JP2011133316A - Fuel assembly - Google Patents

Fuel assembly Download PDF

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JP2011133316A
JP2011133316A JP2009292438A JP2009292438A JP2011133316A JP 2011133316 A JP2011133316 A JP 2011133316A JP 2009292438 A JP2009292438 A JP 2009292438A JP 2009292438 A JP2009292438 A JP 2009292438A JP 2011133316 A JP2011133316 A JP 2011133316A
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end plug
rod
water
fuel
water rod
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JP5490518B2 (en
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Mitsuko Kida
美津子 木田
Noburo Tsutsumi
信郎 堤
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Global Nuclear Fuel Japan Co Ltd
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Global Nuclear Fuel Japan Co Ltd
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To prevent rotation of a water rod with a tab by a simple constitution, without having to carry out angular hole machining which is difficult of high-precision machining. <P>SOLUTION: In a fuel assembly having a plurality of fuel rods arrayed in a grid shape, at least one or more water rods, a spacer for supporting the fuel rods and the water rods at equal intervals, and upper- and lower-tie plates for supporting and fixing the fuel rods and the water rods, wherein one of the water rods has the tab, a sectional shape of an upper-end plug or a lower-end plug of the water rod with the tab is a polygon or a shape with a key groove, and a washer wherein an insertion hole to be fitted to the upper-end plug or to the lower-end plug of the water rod with the tab is formed on one end; and a circular penetration hole, to be fitted to the upper-end plug or the lower-end plug of a water rod without the tab or a fuel rod is formed on the other end, is fitted to the upper-end plug or to the lower-end plug of the water rod with the tab, and to the upper-end plug or to the lower-end plug of the water rod without the tab or the fuel rod. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は沸騰水型原子炉に装荷される燃料集合体に関し、特に、回転防止機能を備えたウォータロッドを有する燃料集合体に関する。   The present invention relates to a fuel assembly loaded in a boiling water reactor, and more particularly to a fuel assembly having a water rod having an anti-rotation function.

沸騰水型原子炉で用いられる燃料集合体を図５により説明する。燃料集合体１は、正方角筒状のチャンネルボックス２内に核燃料を収容した多数本の燃料棒３と核燃料を収容してないウォータロッド４を正方格子状に配列すると共に、それらの上下両端部を上部タイプレート５と下部タイプレート６とによりそれぞれ固定し、その中間部に、複数個のスペーサ７を具備し、燃料棒３及びウォータロッド４の軸方向の相互間隔を保っている。また、燃料棒の伸び差を吸収するためウォータロッド４の上部端栓４１１、４１２と燃料棒３の上部端栓３１には膨張スプリング８が装着されている。   A fuel assembly used in a boiling water reactor will be described with reference to FIG. The fuel assembly 1 has a square rectangular tube box 2 in which a large number of fuel rods 3 containing nuclear fuel and a water rod 4 not containing nuclear fuel are arranged in a square lattice shape and their upper and lower ends. Are fixed by an upper tie plate 5 and a lower tie plate 6, respectively, and a plurality of spacers 7 are provided in an intermediate portion thereof to keep the mutual spacing in the axial direction of the fuel rod 3 and the water rod 4. Further, expansion springs 8 are attached to the upper end plugs 411 and 412 of the water rod 4 and the upper end plug 31 of the fuel rod 3 in order to absorb the difference in elongation of the fuel rods.

ウォータロッド４は、タブ４１２が上下方向に複数設けられたタブ付きウォータロッド４１とタブ無しウォータロッド４２からなり、タブ付きウォータロッド４１のタブ４１２は、タブとタブとの間にスペーサ７を挟持し、スペーサ７が軸方向に移動するのを防止する（特許文献１）。   The water rod 4 is composed of a water rod 41 with tabs provided with a plurality of tabs 412 in the vertical direction and a water rod 42 without tabs. The tab 412 of the water rod 41 with tabs holds the spacer 7 between the tabs. Thus, the spacer 7 is prevented from moving in the axial direction (Patent Document 1).

燃料集合体１を組立てる際、タブ付きウォータロッド４１は、タブ４１２が組立位置に設置された複数個のスペーサ７と接触しないようにスペーサ７に挿入される。挿入後、スペーサ７の軸方向の移動を制限するため、タブ４１２がスペーサ７を挟持する位置になるように、タブ付きウォータロッド４１を回転させ調整する。   When the fuel assembly 1 is assembled, the water rod 41 with the tab is inserted into the spacer 7 so that the tab 412 does not contact the plurality of spacers 7 installed at the assembly position. After insertion, in order to limit the movement of the spacer 7 in the axial direction, the tabbed water rod 41 is rotated and adjusted so that the tab 412 is positioned to sandwich the spacer 7.

タブ付きウォータロッド４１を調整した後、燃料集合体１は炉心に装填されるが、プラント稼働中にタブ付ウォータロッド４１が振動等により回転すると、タブ４１２がスペーサ７と干渉しない位置に移動し、スペーサ７との係合が外れる可能性がある。そのため、従来、タブ付きウォータロッド４１の端栓を多角形の形状とし、上部又は下部タイプレート５、６に設けられた同形状の穴に嵌合させ、タブ付ウォータロッド４１が回転するのを防止する回転防止手段が設けられていた（特許文献１）。   After adjusting the tabbed water rod 41, the fuel assembly 1 is loaded into the reactor core. If the tabbed water rod 41 rotates due to vibration or the like during plant operation, the tab 412 moves to a position where it does not interfere with the spacer 7. There is a possibility that the engagement with the spacer 7 is released. Therefore, conventionally, the end plug of the water rod 41 with tabs has a polygonal shape and is fitted into holes of the same shape provided in the upper or lower tie plates 5 and 6, and the water rod 41 with tabs rotates. An anti-rotation means for preventing was provided (Patent Document 1).

特開昭６２−３８３９１号公報JP-A-62-38391

上述した従来の回転防止手段は、ウォータロッドの端栓とタイプレートの両方を、例えば多角形状の断面嵌合形状に加工する必要があるが、いずれも高い加工精度が要求される。特に、タイプレートの厚みが大きい場合、タイプレートに多角形状の角穴を高精度で形成することは、加工、仕上げに長時間要し、非常に困難であった。   The conventional anti-rotation means described above needs to process both the end plug and tie plate of the water rod into, for example, a polygonal cross-sectional fitting shape, and both require high processing accuracy. In particular, when the thickness of the tie plate is large, it is very difficult to form a polygonal square hole in the tie plate with high accuracy because it takes a long time for processing and finishing.

本発明は、上記課題を解決するためになされたものであり、高精度加工が困難な角穴加工をおこなうことなく、簡便な構成でタブ付きウォータロッドの回転を防止することができる燃料集合体を提供することを目的とする。   The present invention has been made to solve the above-described problem, and can prevent rotation of a water rod with a tab with a simple configuration without performing square hole processing that is difficult to perform with high precision. The purpose is to provide.

上記課題を解決するために、本発明に係る燃料集合体は、格子状に配列された複数の燃料棒と、内部に冷却水が導入される少なくとも１本以上のウォータロッドと、前記複数の燃料棒及びウォータロッドを等間隔に支持するスペーサと、前記燃料棒とウォータロッドの上部端栓及び下部端栓を支持固定する上部タイプレート及び下部タイプレートとを有し、前記ウォータロッドの１つは外周面に前記スペーサを挟持するタブが設けられているタブ付きウォータロッドである燃料集合体において、前記タブ付きウォータロッドの上部端栓又は下部端栓の断面形状は多角形又はキー溝付形状であり、一端部に前記タブ付きウォータロッドの上部端栓又は下部端栓と嵌合する挿入孔が形成され、他端部にタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓と嵌合する円形状の貫通孔が設けられたワッシャを、前記タブ付きウォータロッドの上部端栓又は下部端栓、およびタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓に嵌合することを特徴とする。   In order to solve the above problems, a fuel assembly according to the present invention includes a plurality of fuel rods arranged in a grid, at least one water rod into which cooling water is introduced, and the plurality of fuels. A spacer for supporting rods and water rods at equal intervals; and an upper tie plate and a lower tie plate for supporting and fixing upper end plugs and lower end plugs of the fuel rods and water rods, one of the water rods being In the fuel assembly which is a water rod with tabs provided with tabs for holding the spacer on the outer peripheral surface, the cross-sectional shape of the upper end plug or the lower end plug of the water rod with tabs is a polygon or a shape with a key groove. There is an insertion hole that fits into the upper end plug or lower end plug of the water rod with tabs at one end, and the upper part of the water rod or fuel rod without tabs at the other end A washer provided with a circular through hole to be fitted to the stopper or the lower end plug; an upper end plug or a lower end plug of the water rod with tabs; and an upper end plug or a lower portion of the water rod or fuel rod without tabs It is characterized by fitting to an end plug.

また、本発明に係る燃料集合体は、格子状に配列された複数の燃料棒と、内部に冷却水が導入される少なくとも１本以上のウォータロッドと、前記複数の燃料棒及びウォータロッドを等間隔に支持するスペーサと、前記燃料棒とウォータロッドの上部端栓及び下部端栓を支持固定する上部タイプレート及び下部タイプレートとを有し、前記ウォータロッドの１つは外周面に前記スペーサを挟持するタブが設けられているタブ付きウォータロッドである燃料集合体において、前記タブ付きウォータロッドの上部端栓又は下部端栓の断面形状は多角形又はキー溝付形状であり、一端部に前記タブ付きウォータロッドの上部端栓又は下部端栓と嵌合する嵌合爪が形成され、他端部にタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓と嵌合する円形状の貫通孔が設けられたワッシャを、前記タブ付きウォータロッドの上部端栓又は下部端栓、およびタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓に嵌合することを特徴とする。   The fuel assembly according to the present invention includes a plurality of fuel rods arranged in a grid, at least one water rod into which cooling water is introduced, and the plurality of fuel rods and water rods. A spacer that supports the spacer, and an upper tie plate and a lower tie plate that support and fix the upper end plug and the lower end plug of the fuel rod and the water rod, and one of the water rods has the spacer on the outer peripheral surface. In the fuel assembly which is a water rod with a tab provided with a tab to be sandwiched, the cross-sectional shape of the upper end plug or the lower end plug of the water rod with the tab is a polygon or a shape with a key groove, A fitting claw that fits with the upper end plug or lower end plug of a water rod with a tab is formed, and the upper end plug or lower end plug of a water rod or fuel rod without a tab at the other end is fitted. And fitting a washer provided with a circular through hole to the upper end plug or lower end plug of the water rod with tabs and the upper end plug or lower end plug of the water rod or fuel rod without tabs. Features.

本発明によれば、高精度加工が困難な角穴加工をおこなうことなく、安価で簡便な構成のワッシャを用いることにより、タブ付ウォータロッドの回転を防止することができる燃料集合体を提供することができる。   According to the present invention, there is provided a fuel assembly capable of preventing the rotation of a water rod with a tab by using a washer having a simple and inexpensive configuration without performing a square hole machining that is difficult to perform with high precision. be able to.

本発明の第１の実施形態に係るワッシャの構成図。The block diagram of the washer which concerns on the 1st Embodiment of this invention. 第１の実施形態に係るワッシャの第１の変形例。The 1st modification of the washer concerning a 1st embodiment. 第１の実施形態に係るワッシャの第２の変形例。The 2nd modification of the washer concerning a 1st embodiment. 本発明の第２の実施形態に係るワッシャの構成図。The block diagram of the washer which concerns on the 2nd Embodiment of this invention. 燃料集合体の全体構成図。The whole fuel assembly block diagram.

本発明の燃料集合体に係る実施形態を、図面を参照して説明する。
（第１の実施形態）
本発明の第１の実施形態を図１乃至図３により説明する。
本第１の実施形態において、タブ付きウォータロッド４１の上部端栓４１１の断面形状は角形状であり、タブ無しウォータロッド４２の上部端栓４２１及び燃料棒３の上部端栓３１の断面形状は円形である。ワッシャ９は、図２に示すように、一端部に前記タブ付きウォータロッド４１の上部端栓４１１と嵌合する角形状の挿入孔９１が形成され、他端部にタブのないウォータロッド４２の上部端栓４２１又は燃料棒３の上部端栓３１と嵌合する円形状の貫通孔９２が形成された細長の板状部材から構成され、上部タイプレート５と膨張スプリング８の間に設置固定される。 An embodiment according to a fuel assembly of the present invention will be described with reference to the drawings.
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, the cross-sectional shape of the upper end plug 411 of the tabbed water rod 41 is a square shape, and the cross-sectional shapes of the upper end plug 421 of the tabless water rod 42 and the upper end plug 31 of the fuel rod 3 are It is circular. As shown in FIG. 2, the washer 9 is formed with a rectangular insertion hole 91 that fits into the upper end plug 411 of the tabbed water rod 41 at one end, and the water rod 42 without a tab at the other end. It is composed of an elongated plate-like member formed with a circular through hole 92 that fits with the upper end plug 421 or the upper end plug 31 of the fuel rod 3, and is installed and fixed between the upper tie plate 5 and the expansion spring 8. The

このワッシャ９の一方の端部に設けられた角形状の挿入孔９１にタブ付きウォータロッド４１の上部端栓４１１を嵌合する。その際、挿入孔９１の嵌合形状によりタブ付きウォータロッド４１の周方向の位置が決まるためタブ４１２の位置決めの役割を果たす。   The upper end plug 411 of the water rod 41 with tabs is fitted into a rectangular insertion hole 91 provided at one end of the washer 9. At this time, since the circumferential position of the water rod 41 with the tab is determined by the fitting shape of the insertion hole 91, the tab 412 is positioned.

また、ワッシャ９の他端部に設けられた円形の挿入孔９２にタブ無しウォータロッド４２の上部端栓４２１又は燃料棒３の上部端栓３１を嵌合させることにより、ワッシャ９自身が周方向に回転するのを防止するとともに、タブ付きウォータロッド４１の回転を防止する。
なお、本実施形態において、ウォータロッドを組み立てる際は、ワッシャをはめ込んだ時のタブ位置が規定の位置になるようにする必要がある。 Further, by fitting the upper end plug 421 of the tabless water rod 42 or the upper end plug 31 of the fuel rod 3 into the circular insertion hole 92 provided at the other end portion of the washer 9, the washer 9 itself is circumferentially moved. And the rotation of the tabbed water rod 41 is prevented.
In this embodiment, when assembling the water rod, it is necessary to set the tab position when the washer is fitted to a specified position.

また、本発明に係るワッシャ９の挿入孔９１および前記タブ付きウォータロッドの上部端栓又は下部端栓の嵌合形状は角形状に限らず、図２に示すようなキー溝形状、及び図３に示すような多角形状としてもよく、その他、円形以外の種々の形状が考えられる。例えば、円柱体の一部を平面とした円弧を有する形状としてもよい。なお、前記タブ付きウォータロッドの上部端栓又は下部端栓の嵌合形状はワッシャ９の挿入孔９１の形状に嵌った際、回転しない組み合わせになっていれば、特に同じ形状である必要はない。   Further, the fitting shape of the insertion hole 91 of the washer 9 according to the present invention and the upper end plug or the lower end plug of the tabbed water rod is not limited to a square shape, but a key groove shape as shown in FIG. In addition, various shapes other than a circular shape are conceivable. For example, it is good also as a shape which has the circular arc which made a part of cylindrical body a plane. The fitting shape of the upper end plug or the lower end plug of the water rod with tabs does not need to be the same shape as long as it is a combination that does not rotate when fitted into the shape of the insertion hole 91 of the washer 9. .

なお、本実施形態では、ワッシャ９を上部タイプレート５に装着した例を説明したが、ワッシャ９をタブ付きウォータロッド４１の下部端栓４１３及びタブ無しウォータロッド４２の下部端栓４２３又は燃料棒の下部端栓に嵌合することも可能である。その際、ワッシャ９は下部タイプレート６と下部端栓の間に装着され、上部端栓に設置された膨張スプリング８の押付力により固定される。   In this embodiment, the example in which the washer 9 is mounted on the upper tie plate 5 has been described. However, the washer 9 is attached to the lower end plug 413 of the water rod 41 with tabs and the lower end plug 423 of the water rod 42 without tabs or the fuel rod. It is also possible to fit into the lower end plug of this. At that time, the washer 9 is mounted between the lower tie plate 6 and the lower end plug, and is fixed by the pressing force of the expansion spring 8 installed in the upper end plug.

しかしながら、燃料貯蔵プールで燃料集合体の解体、再組み立てを行う場合を考慮する場合、下部側に設置した場合にはウォータロッドの下部端栓から抜け落ちてプール内に落下する恐れがあるため、ワッシャは下部側に設置するより上部側に設置することが好ましく、さらには、膨張スプリングと上部タイプレートの間に設置するのがより好ましい。   However, when considering the disassembly and reassembly of the fuel assembly in the fuel storage pool, if installed on the lower side, it may fall out of the lower end plug of the water rod and fall into the pool. Is preferably installed on the upper side rather than installed on the lower side, and more preferably installed between the expansion spring and the upper tie plate.

また、上記実施形態では、ウォータロッドはタブ付きウォータロッドとタブ無しウォータロッドの２本からなる例について説明したが、ウォータロッドがタブ付きウォータロッドの１本からなる燃料集合体にも適用できることはもちろんである。   In the above-described embodiment, the example in which the water rod includes two water rods with tabs and the water rod without tabs has been described. However, the water rod can be applied to a fuel assembly including one water rod with tabs. Of course.

本第１の実施形態によれば、高精度加工が困難な角穴加工をおこなうことなく、安価で簡便な構成のワッシャを用いることにより、タブ付きウォータロッドの回転を防止することができる。   According to the first embodiment, it is possible to prevent the water rod with tabs from rotating by using a washer having an inexpensive and simple configuration without performing a square hole machining that is difficult to perform with high precision.

（第２の実施形態）
本発明の第２の実施形態を図４により説明する。
本第２の実施形態では、タブ付きウォータロッド４１の上部端栓４１１が嵌合されるワッシャ９の端部の形状を、一辺が開放端を形成する角形の嵌合爪９３としている。 (Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the shape of the end portion of the washer 9 to which the upper end plug 411 of the water rod 41 with tabs is fitted is a square fitting claw 93 whose one side forms an open end.

このような構成のワッシャ９を、例えば、下部端栓が下部タイプレート６にねじ込み結合されている燃料集合体に用いる場合には、タブ付きウォータロッド４１の下部端栓４１３をネジ止めした後、ネジを回転させて下部端栓４１３の方向を調整し、ワッシャ９の嵌合爪９３を嵌めた後、タブ無しウォータロッド４２の下部端栓４２３又は燃料棒３の下部端栓をもう一方の挿入孔９２に挿入する。図４の実施形態の下部端栓４１３の形状はネジ部より上部であるが、ネジ部を、円柱体の一部を平面とした円弧を有する形状とし、嵌合部としてもよい。この場合のワッシャ９はウォータロッド４２又は燃料棒３の上部端栓に設置された膨張スプリング８の押付力により固定することができる。   For example, when the washer 9 having such a structure is used for a fuel assembly in which the lower end plug is screwed to the lower tie plate 6, the lower end plug 413 of the tabbed water rod 41 is screwed. After rotating the screw to adjust the direction of the lower end plug 413 and fitting the fitting claw 93 of the washer 9, the lower end plug 423 of the tabless water rod 42 or the lower end plug of the fuel rod 3 is inserted into the other. Insert into hole 92. Although the shape of the lower end plug 413 in the embodiment of FIG. 4 is higher than the screw portion, the screw portion may have a circular arc shape with a part of the cylindrical body as a plane, and may be a fitting portion. The washer 9 in this case can be fixed by the pressing force of the expansion spring 8 installed on the water rod 42 or the upper end plug of the fuel rod 3.

本第２の実施形態によれば、端栓をネジ止めした後にワッシャを装着することができるため、ワッシャ及びタブ付きウォータロッドの交換、装着及び燃料集合体の組立・解体作業をより簡単におこなうことができる。   According to the second embodiment, since the washer can be mounted after the end plug is screwed, replacement and mounting of the washer and the water rod with the tab and assembly / disassembly of the fuel assembly can be performed more easily. be able to.

また、第１の発明と同様に、本発明に係るワッシャ９の嵌合爪９３および前記タブ付きウォータロッドの上部端栓又は下部端栓の嵌合形状は角形状に限らず、図２に示すようなキー溝形状、及び図３に示すような多角形状としてもよく、その他、円形以外の種々の形状が考えられる。例えば、円柱体の一部を平面とした円弧を有する形状としてもよい。なお、前記タブ付きウォータロッドの上部端栓又は下部端栓の嵌合形状はワッシャ９の嵌合爪９３の形状に嵌った際、回転しない組み合わせになっていれば、特に同じ形状である必要はない。   Similarly to the first invention, the fitting shape of the fitting claw 93 of the washer 9 according to the present invention and the upper end plug or the lower end plug of the tabbed water rod is not limited to a square shape, but is shown in FIG. Such a key groove shape and a polygonal shape as shown in FIG. 3 may be used, and various shapes other than a circular shape are conceivable. For example, it is good also as a shape which has the circular arc which made a part of cylindrical body flat. In addition, the fitting shape of the upper end plug or the lower end plug of the water rod with a tab needs to be the same shape as long as it is a combination that does not rotate when fitted into the shape of the fitting claw 93 of the washer 9. Absent.

１…燃料集合体、２…チャンネルボックス、３…燃料棒、３１…燃料棒の上部端栓、４…ウォータロッド、４１…タブ付きウォータロッド、４１１…タブ付きウォータロッドの上部端栓、４１２…タブ、４１３…タブ付きウォータロッドの下部端栓、４２…タブ無しウォータロッド、４２１…タブ無しウォータロッドの上部端栓、４２３…タブ無しウォータロッドの下部端栓、５…上部タイプレート、６…下部タイプレート、７…スペーサ、８…膨張スプリング、９…ワッシャ、９１…タブ付きウォータロッド用の挿入孔、９２…タブ無しウォータロッド又は燃料棒用の挿入孔、９３…タブ付きウォータロッド用の嵌合爪。 DESCRIPTION OF SYMBOLS 1 ... Fuel assembly, 2 ... Channel box, 3 ... Fuel rod, 31 ... Upper end plug of fuel rod, 4 ... Water rod, 41 ... Water rod with tab, 411 ... Upper end plug of water rod with tab, 412 ... Tabs, 413 ... lower end plugs of tabbed water rods, 42 ... water rods without tabs, 421 ... upper end plugs of water rods without tabs, 423 ... lower end plugs of water rods without tabs, 5 ... upper tie plates, 6 ... Lower tie plate, 7 ... spacer, 8 ... expansion spring, 9 ... washer, 91 ... insertion hole for water rod with tab, 92 ... insertion hole for water rod or fuel rod without tab, 93 ... for water rod with tab Mating claw.

Claims (4)

格子状に配列された複数の燃料棒と、内部に冷却水が導入される少なくとも１本以上のウォータロッドと、前記複数の燃料棒及びウォータロッドを等間隔に支持するスペーサと、前記燃料棒とウォータロッドの上部端栓及び下部端栓を支持固定する上部タイプレート及び下部タイプレートとを有し、前記ウォータロッドの１つは外周面に前記スペーサを挟持するタブが設けられているタブ付きウォータロッドである燃料集合体において、
前記タブ付きウォータロッドの上部端栓又は下部端栓の断面形状は多角形又はキー溝付形状であり、一端部に前記タブ付きウォータロッドの上部端栓又は下部端栓と嵌合する挿入孔が形成され、他端部にタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓と嵌合する円形状の貫通孔が形成されたワッシャを、前記タブ付きウォータロッドの上部端栓又は下部端栓、およびタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓に嵌合することを特徴とする燃料集合体。 A plurality of fuel rods arranged in a grid, at least one water rod into which cooling water is introduced, a spacer that supports the plurality of fuel rods and the water rod at equal intervals, and the fuel rod; A water with tab having an upper tie plate and a lower tie plate for supporting and fixing an upper end plug and a lower end plug of the water rod, and one of the water rods is provided with a tab for sandwiching the spacer on an outer peripheral surface. In the fuel assembly that is a rod,
The cross-sectional shape of the upper end plug or the lower end plug of the tabbed water rod is a polygonal shape or a key groove shape, and an insertion hole for fitting with the upper end plug or the lower end plug of the tabbed water rod is formed at one end. A washer formed with a circular through-hole to be fitted to the upper end plug or lower end plug of the water rod or fuel rod without tabs formed at the other end is connected to the upper end plug or lower portion of the water rod with tabs. A fuel assembly characterized by being fitted to an end plug and an upper end plug or a lower end plug of a water rod or fuel rod without a tab. 格子状に配列された複数の燃料棒と、内部に冷却水が導入される少なくとも１本以上のウォータロッドと、前記複数の燃料棒及びウォータロッドを等間隔に支持するスペーサと、前記燃料棒とウォータロッドの上部端栓及び下部端栓を支持固定する上部タイプレート及び下部タイプレートとを有し、前記ウォータロッドの１つは外周面に前記スペーサを挟持するタブが設けられているタブ付きウォータロッドである燃料集合体において、
前記タブ付きウォータロッドの上部端栓又は下部端栓の断面形状は多角形又はキー溝付形状であり、一端部に前記タブ付きウォータロッドの上部端栓又は下部端栓と嵌合する嵌合爪が形成され、他端部にタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓と嵌合する円形状の貫通孔が形成されたワッシャを、前記タブ付きウォータロッドの上部端栓又は下部端栓、およびタブのないウォータロッド又は燃料棒の上部端栓又は下部端栓に嵌合することを特徴とする燃料集合体。 A plurality of fuel rods arranged in a grid, at least one water rod into which cooling water is introduced, a spacer for supporting the plurality of fuel rods and the water rod at equal intervals, and the fuel rod; A water with a tab having an upper tie plate and a lower tie plate for supporting and fixing an upper end plug and a lower end plug of the water rod, and one of the water rods is provided with a tab for sandwiching the spacer on an outer peripheral surface. In the fuel assembly that is a rod,
The cross-sectional shape of the upper end plug or the lower end plug of the water rod with tabs is a polygon or a shape with a key groove, and a fitting claw that fits the upper end plug or lower end plug of the water rod with tabs at one end. And a washer having a circular through-hole that is fitted to the upper end plug or lower end plug of the water rod or fuel rod without tabs at the other end, the upper end plug of the water rod with tabs or A fuel assembly, wherein the fuel assembly is fitted to a lower end plug and an upper end plug or a lower end plug of a water rod or a fuel rod without a tab. 前記ワッシャを前記上部タイプレートと前記膨張スプリングの間に設置することを特徴とする請求項１又は２記載の燃料集合体。   3. The fuel assembly according to claim 1, wherein the washer is installed between the upper tie plate and the expansion spring. 前記ワッシャを前記下部タイプレートと前記下部端栓の間に設置することを特徴とする請求項１又は２記載の燃料集合体。   The fuel assembly according to claim 1, wherein the washer is installed between the lower tie plate and the lower end plug.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08240681A (en) * 1994-11-03 1996-09-17 General Electric Co <Ge> Fuel bundle aggregate for nuclear reactor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08240681A (en) * 1994-11-03 1996-09-17 General Electric Co <Ge> Fuel bundle aggregate for nuclear reactor

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