JPH055517Y2 - - Google Patents
Info
- Publication number
- JPH055517Y2 JPH055517Y2 JP1986193135U JP19313586U JPH055517Y2 JP H055517 Y2 JPH055517 Y2 JP H055517Y2 JP 1986193135 U JP1986193135 U JP 1986193135U JP 19313586 U JP19313586 U JP 19313586U JP H055517 Y2 JPH055517 Y2 JP H055517Y2
- Authority
- JP
- Japan
- Prior art keywords
- spacer
- water rod
- tab
- corner
- tube
- 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
- 125000006850 spacer group Chemical group 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000000446 fuel Substances 0.000 claims description 16
- 210000002105 tongue Anatomy 0.000 claims description 11
- 239000002826 coolant Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Supports For Pipes And Cables (AREA)
Description
【考案の詳細な説明】
(産業上の利用分野)
この考案は沸騰水型原子炉用の燃料集合体にお
いて多数の燃料棒を一定間隔に保つためのスペー
サの支持装置に関する。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a spacer support device for keeping a large number of fuel rods at regular intervals in a fuel assembly for a boiling water nuclear reactor.
(従来の技術)
沸騰水型原子炉用の燃料集合体では通常第5図
のように2本の燃料棒1と1〜2本のウオータロ
ツド2とを8行8列に立設し、それらの上下端を
上部、下部のタイプレート3a,3bに嵌合支持
させると共にそれらの途中にはスペーサ4を数段
に配設して水平方向の間隔を一定に保つようにし
ている。(Prior art) In a fuel assembly for a boiling water reactor, two fuel rods 1 and one or two water rods 2 are normally arranged in 8 rows and 8 columns, as shown in Fig. 5. The upper and lower ends are fitted and supported by upper and lower tie plates 3a and 3b, and spacers 4 are disposed in several stages in the middle to maintain a constant horizontal spacing.
そして、スペーサ4としては、これまでのよう
に所要数のデバイダーとバーを縦、横に交差させ
て格子状に形成し、デバイダーにはS字状の屈曲
部を設けると共にバーの交差部にはちようちん形
のばね組体を設け、これらによつて燃料棒やウオ
ータロツドを支持するようにしたものでは、各格
子目における屈曲部とばね組体の占有面積が大き
く、冷却材の流れを制限しかつデバイダーやバー
の交差部で冷却材の流れを乱して出力の向上が計
れないところから、最近では第6図イのように円
形(または角形)の管体素子5の上下端の壁面の
一部を内側に膨出させて弧状固定部5aとなすと
共に反対側壁面には縦向きスリツトを設け、この
管体素子5の所定数をスリツトの部分を向き合せ
て正方に配列し、向き合うスリツト中に菱形ルー
プ状のばね体5bを嵌め込んで各管体素子5を
縦、横に連ね、弧状固定部5aとばね体5bで燃
料棒1およびウオータロツド2を支持する一方、
一つのウオータロツド2に対する管体素子5には
同図ロのように切割り5cを設け、この切削り5
cにウオータロツド2に取付けたタブ2aを通し
た上で、ウオータロツド2を回動させてタブ2a
でスペーサ4を支持させるようにしたいわゆるリ
ング素子型のものが特開昭59−65287号に見られ
るように提案されている。 As for the spacer 4, the required number of dividers and bars are made to intersect vertically and horizontally to form a lattice shape as before, and the dividers are provided with S-shaped bent portions and are formed at the intersections of the bars. In the case where a paper towel-shaped spring assembly is provided to support the fuel rods and water rods, the bends in each grid and the spring assembly occupy a large area, which restricts the flow of coolant. In addition, since the flow of coolant is disturbed at the intersections of dividers and bars, making it impossible to improve the output, recently, as shown in FIG. A part of the tubular elements 5 is bulged inward to form an arc-shaped fixing part 5a, and a vertical slit is provided on the opposite wall surface, and a predetermined number of these tubular elements 5 are arranged in a square with the slits facing each other. A diamond-shaped loop-shaped spring body 5b is fitted therein to connect each tube element 5 vertically and horizontally, and the arc-shaped fixing portion 5a and spring body 5b support the fuel rod 1 and water rod 2.
The tubular element 5 for one water rod 2 is provided with a cut 5c as shown in FIG.
Pass the tab 2a attached to the water rod 2 through the tab 2a, then rotate the water rod 2 to remove the tab 2a.
A so-called ring element type device in which the spacer 4 is supported has been proposed in Japanese Patent Laid-Open No. 59-65287.
(考案が解決しようとする問題点)
ところで、近年燃料棒の高燃焼度化と軸方向出
力分布の平坦化を目的として、ウオータロツドの
内容積を大きくしかつ角形断面にすることが試み
られているが、内容積が大きくかつ角形断面のウ
オータロツドでは上記従来装置のようなスペーサ
に対し差し込み回転式の手段を採用することがで
きず(このことは前記格子型のスペーサについて
も同じである)、ロツドをスペーサに組込み後、
タブを所定の位置に溶接することが行われてお
り、これでは作業性が悪く溶接ミスを起す恐れが
ある。(Problem that the invention aims to solve) Incidentally, in recent years, attempts have been made to increase the internal volume of water rods and make them rectangular in cross section, with the aim of increasing the burnup of fuel rods and flattening the axial power distribution. However, in the case of a water rod with a large internal volume and a rectangular cross section, it is not possible to use a means of inserting and rotating the spacer as in the conventional device described above (this also applies to the lattice type spacer), and the rod After incorporating into the spacer,
The tab is welded to a predetermined position, but this method has poor workability and can lead to welding errors.
そこで、この考案は素子型スペーサの利点を活
用すると共に燃料の燃焼度の向上と軸方向分布の
均一化を図り、しかもタブの取付けの容易なスペ
ーサ支持装置を提供するものである。 Therefore, the present invention utilizes the advantages of the element type spacer, improves the burnup of fuel, makes the axial distribution uniform, and provides a spacer support device that allows easy attachment of tabs.
(問題点を解決するための手段)
上記目的のもとにこの考案は、燃料集合体にお
けるスペーサの支持装置として、縦方向に並列す
る多数の細長な燃料棒を一定間隔に保持するスペ
ーサを所要数の円形または角形の管体素子を左右
前後に隣接させて形成するものにおいて、スペー
サの中央部には上記管体素子より断面積の大きな
四角形のウオータロツドを挿通し、該ウオータロ
ツドの少なくとも一つの角隅の外側には上下で対
をなすタブを軸方向に所定の間隔をおいて設け、
上記ウオータロツドのタブを設けた角隅とこれを
囲むスペーサの管体素子とで形成する空所にはタ
ブの対向部分に縦凹所を備えかつその上下端にウ
オータロツド側に折曲する切込み舌片を設けた保
持管を配設し、その切込み舌片を上記タブに係止
させてスペーサを支持するようにしたことを特徴
としている。(Means for Solving the Problems) Based on the above objective, this invention requires a spacer that holds a large number of elongated fuel rods arranged in a vertical direction at regular intervals as a spacer support device in a fuel assembly. In the case where several circular or rectangular tube elements are formed adjacent to each other in the left and right front and back, a rectangular water rod having a larger cross-sectional area than the tube element is inserted into the center of the spacer, and at least one corner of the water rod is inserted. On the outside of the corner, a pair of upper and lower tabs is provided at a predetermined interval in the axial direction,
In the space formed by the corner of the water rod where the tab is provided and the tubular element of the spacer surrounding this corner, a vertical recess is provided in the opposite part of the tab, and a cut tongue piece is provided at the upper and lower ends thereof to be bent toward the water rod side. The present invention is characterized in that a holding tube is provided, and its notched tongue pieces are engaged with the tabs to support the spacer.
(実施例)
第1図はこの考案の一実施例を平面的に示すも
ので、14はスペーサであつて、左右前後に正方
配列された所定数のジルコニウム合金、ニツケル
合金からなる円形の管体素子15と、その周囲を
囲む同じ材質のバンド体17とで構成されてい
る。(Example) Fig. 1 is a plan view showing an embodiment of this invention, and 14 is a spacer, which is a circular tube made of a predetermined number of zirconium alloys and nickel alloys arranged squarely in the left and right front and back. It is composed of an element 15 and a band body 17 made of the same material surrounding the element 15.
ところで、この考案では上記スペーサ14の中
央部に、ジスコニウム合金またはステンレス鋼か
らなり一辺の長さが管体素子15の直径の約2倍
以上に相当する大きさの四角形のウオータロツド
12が挿通され、ウオータロツド12の一対角方
向の角隅の外側にはスペーサ14の配設位置に合
せて第3図イのように管体素子15の高さすなわ
ちスペーサ14の高さより若干大きな間隔をおい
て上下で対をなすタブ13がそれぞれ取付けられ
る一方、第1図のように平面からみて、ウオータ
ロツド12の上記タブ13が設けられた角隅とそ
の角隅を囲む三つの管体素子15で形成される空
所には、管体素子15に材質と高さを同じく3図
ロのようにタブ13に対向する部分に弧状の縦凹
所16aを有し該凹所16aの上下端に切込み舌
辺16bが設けられた小径の保持管16が配設さ
れ、その外面の一部が三つの管体素子15の外面
に溶接され、縦凹所16aの上下端の切込み舌片
16bがウオータロツド側に折り曲げられ、この
上下の切込み舌片16bを介して各段のスペーサ
14はウオータロツド12上のそれぞれ対をなす
上下のタブ13の間に保持されている。 By the way, in this invention, a rectangular water rod 12 made of disconium alloy or stainless steel and having a length corresponding to about twice or more the diameter of the tubular element 15 is inserted into the center of the spacer 14. On the outside of one diagonal corner of the water rod 12, there are vertically spaced holes slightly larger than the height of the tubular element 15, that is, the height of the spacer 14, as shown in FIG. While the pairs of tabs 13 are respectively attached, when viewed from a plane as shown in FIG. As shown in FIG. 3B, the tubular element 15 has an arc-shaped vertical recess 16a in the part facing the tab 13, and a cut tongue side 16b is formed at the upper and lower ends of the recess 16a. A small-diameter holding tube 16 is provided, a part of its outer surface is welded to the outer surface of the three tube elements 15, and cut tongue pieces 16b at the upper and lower ends of the vertical recess 16a are bent toward the water rod side. The spacers 14 at each stage are held between pairs of upper and lower tabs 13 on the water rod 12 via the upper and lower cutting tongues 16b.
しかし、組立て時にはウオータロツド12がタ
ブ13を保持管16の縦凹所16aに沿わせてス
ペーサ14の中央空所に挿通され、対をなすタブ
13が管体素子15の上下に位置させられ、その
後において保持管16の凹所上下端の切込み舌片
16bが治具によりウオータロツド12側に折り
曲げられる。第2図はその平面状態を示すもので
ある。 However, during assembly, the water rod 12 is inserted into the central cavity of the spacer 14 with the tab 13 aligned with the vertical recess 16a of the holding tube 16, and the paired tabs 13 are positioned above and below the tube element 15, and then In this step, the cut tongue pieces 16b at the upper and lower ends of the recess of the holding tube 16 are bent toward the water rod 12 using a jig. FIG. 2 shows its planar state.
なお、ウオータロツド12のタブ13は第1図
のように一対角方向の角隅に限らず、一つの角隅
でもまたはすべての角隅に設けるようにしてもよ
い。 Note that the tabs 13 of the water rod 12 are not limited to one diagonal corner as shown in FIG. 1, but may be provided at one corner or all corners.
そして、第4図はスペーサ12の管体素子15
を八角形とした変更例を示すものである。 FIG. 4 shows the tubular element 15 of the spacer 12.
This shows an example of changing the shape to an octagon.
(考案の効果)
以上のようにこの考案では、多数の燃料棒を一
定間隔に保持するスペーサを円形、角形などの管
体素子を連ねたものとなし、かつその中央部には
管体素子より断面の大きな四角形のウオータロツ
ドを挿通し、このウオータロツドの少なくとも一
つの角隅の外側には上下で対をなすタブを軸方向
に一定の間隔で設け、そして、タブを有するウオ
ータロツドの角隅とこれを囲む管体素子とで形成
される空所には、タブの対向部分には縦凹所を有
すると共にその上下端にウオータロツド側に折曲
した切込み舌片を設けた保持管を配設して、その
切込み舌片をタブに係止させてスペーサを保持す
るようにしたので、冷却材の流れを制限したり流
れを乱したりすることが防止されるばかりでな
く、ウオータロツドによる減速材の保有量を多く
することができ、燃料の燃焼度を高めると共に軸
方向の出力分布を平坦化することができ、しかも
ウオータロツドにはスペーサの組付け後にタブを
取付ける必要がなく、作業が簡単になり溶接ミス
を起したりする恐れはない。(Effects of the invention) As described above, in this invention, the spacer that holds a large number of fuel rods at regular intervals is made up of a series of circular, square, etc. tubular elements, and the central part of the spacer is A water rod with a large square cross section is inserted, and a pair of upper and lower tabs are provided at regular intervals in the axial direction on the outside of at least one corner of the water rod, and this is connected to the corner of the water rod having the tab. In the space formed by the surrounding tubular element, a holding tube is disposed, which has a vertical recess in the portion facing the tab and has notched tongues bent toward the waterrod side at its upper and lower ends. Since the spacer is held by locking the cut tongue piece to the tab, it is not only possible to prevent the flow of coolant from being restricted or disturbed, but also to reduce the amount of moderator material retained by the water rod. It is possible to increase the burn-up of the fuel and flatten the power distribution in the axial direction.Furthermore, there is no need to attach a tab to the water rod after assembling the spacer, which simplifies the work and reduces welding mistakes. There is no risk of it happening.
第1図はこの考案の一実施例の平面図。第2図
は第1図の鎖線部分の拡大平面図。第3図イは第
2図X−X線に沿つた断面図。第3図ロは保持管
の斜視図。第4図は変更例の一部を平面図。第5
図は燃料集合体の断面図。第6図イは公知の素子
型スペーサの半部の平面図。同図ロはそのスペー
サ支持部の側面図。
図中、1……燃料棒、12……ウオータロツ
ド、13……タブ、14……スペーサ、15……
管体素子、16……保持管、16a……縦凹所、
16b……切込み舌片。
FIG. 1 is a plan view of an embodiment of this invention. FIG. 2 is an enlarged plan view of the chain line portion in FIG. FIG. 3A is a sectional view taken along the line XX in FIG. 2. FIG. 3B is a perspective view of the holding tube. FIG. 4 is a plan view of a part of the modified example. Fifth
The figure is a cross-sectional view of the fuel assembly. FIG. 6A is a plan view of a half part of a known element type spacer. Figure B is a side view of the spacer support portion. In the figure, 1... Fuel rod, 12... Water rod, 13... Tab, 14... Spacer, 15...
Tube element, 16... holding tube, 16a... vertical recess,
16b...Incised tongue piece.
Claims (1)
間隔に保持するスペーサ14を所要数の円形また
は角形の管体素子15を左右前後に隣接させて形
成するものにおいて、スペーサ14の中心部には
上記管体素子15より断面積の大きな四角形のウ
オータロツド12を挿通し、該ウオータロツド1
2の少なくとも一つの角隅の外側には上下で対を
なすタブ13を軸方向に所定の間隔をおいて設
け、上記ウオータロツド12のタブ13を設けた
角隅とこれを囲むスペーサ14の管体素子15と
で形成する空所にはタブ13の対向部分に縦凹所
16aを備えかつその上下端にウオータロツド側
に折曲する切込み舌片16bを設けた保持管16
を配設し、その切込み舌片16bを上記タブ13
に係止させてスペーサ14を支持するようにして
なる燃料集合体におけるスペーサの支持装置。 In a spacer 14 that holds a large number of elongated fuel rods 1 arranged in parallel in the vertical direction at regular intervals, a required number of circular or square tube elements 15 are formed adjacent to each other in the left and right front and back. A rectangular water rod 12 having a larger cross-sectional area than the tubular element 15 is inserted through the water rod 1.
A pair of upper and lower tabs 13 are provided at a predetermined interval in the axial direction on the outside of at least one corner of the water rod 12, and the corner of the water rod 12 where the tab 13 is provided and the tube body of the spacer 14 surrounding this corner. In the space formed by the element 15, a holding tube 16 is provided with a vertical recess 16a in the opposite part of the tab 13, and provided with cut tongues 16b bent toward the water rod side at the upper and lower ends thereof.
is arranged, and the cut tongue piece 16b is attached to the tab 13.
A support device for a spacer in a fuel assembly, which supports a spacer 14 by being engaged with the spacer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986193135U JPH055517Y2 (en) | 1986-12-17 | 1986-12-17 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986193135U JPH055517Y2 (en) | 1986-12-17 | 1986-12-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6397891U JPS6397891U (en) | 1988-06-24 |
JPH055517Y2 true JPH055517Y2 (en) | 1993-02-12 |
Family
ID=31148877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1986193135U Expired - Lifetime JPH055517Y2 (en) | 1986-12-17 | 1986-12-17 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH055517Y2 (en) |
-
1986
- 1986-12-17 JP JP1986193135U patent/JPH055517Y2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS6397891U (en) | 1988-06-24 |
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