JPH01142491A - Fuel assembly for nuclear reactor - Google Patents
Fuel assembly for nuclear reactorInfo
- Publication number
- JPH01142491A JPH01142491A JP62299910A JP29991087A JPH01142491A JP H01142491 A JPH01142491 A JP H01142491A JP 62299910 A JP62299910 A JP 62299910A JP 29991087 A JP29991087 A JP 29991087A JP H01142491 A JPH01142491 A JP H01142491A
- Authority
- JP
- Japan
- Prior art keywords
- end plug
- fuel
- tie plate
- fuel assembly
- fuel rod
- 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 abstract description 70
- 239000003758 nuclear fuel Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- OOYGSFOGFJDDHP-KMCOLRRFSA-N kanamycin A sulfate Chemical group OS(O)(=O)=O.O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N OOYGSFOGFJDDHP-KMCOLRRFSA-N 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
- Fuel-Injection Apparatus (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、沸騰水型原子炉などに適用される燃ｙ＋＋集
合体に関し、ざらに詳しくは、その解体の際の安全性を
向上せしめ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 a fuel y++ assembly applied to boiling water nuclear reactors, etc. This invention relates to a fuel assembly with improved performance.
（従来の技術）
沸騰水型原子炉に適用される燃料集合体の構成を第５図
に示す。この図に示されるように、燃料集合体は角筒状
のチャンネルボックス１内に多数の燃料棒２と数本のウ
ォーターロンドとが収容されて構成されている。各燃料
棒２およびつｌ−ターロッドは複数のスペーサ３により
それらの間隔が保持されて格子状に配置され、上部タイ
プレート４および下部タイプレート５によってチャンネ
ルボックス１内に支持されている。(Prior Art) FIG. 5 shows the configuration of a fuel assembly applied to a boiling water reactor. As shown in this figure, the fuel assembly is constructed by housing a large number of fuel rods 2 and several water ronds in a rectangular cylindrical channel box 1. The fuel rods 2 and the tar rods are arranged in a lattice pattern with their spacing maintained by a plurality of spacers 3, and are supported within the channel box 1 by an upper tie plate 4 and a lower tie plate 5.
上記燃料棒２は燃料被覆管６内に多数個の円柱状ＵＯ２
燃利ペリット７を装填し、下部を下部端栓８で、上部を
上部端栓９で密閉した構造となっている。The fuel rod 2 has a large number of cylindrical UO2 inside the fuel cladding tube 6.
It has a structure in which fuel pellets 7 are loaded and the lower part is sealed with a lower end plug 8 and the upper part is sealed with an upper end plug 9.
上部タイプレート４および下部タイプレート５は、上部
端栓９、・下部端栓８をそれぞれ支持するため、これら
と嵌合する支持孔１０．１１を下部端栓９、下部端栓８
の対応位置に備えている。そして下部タイプレート５の
支持孔１１のいくつかは、第７図（第５図のＢ部分の拡
大図）に示すように、雄ネジ付き下部端栓８ａを有する
燃料棒２ａ（以下、結合燃料棒と云う）と結合するため
の雌ネジ孔１１ａとなっている。The upper tie plate 4 and the lower tie plate 5 support the upper end plug 9 and the lower end plug 8, respectively.
It is equipped in the corresponding position. As shown in FIG. 7 (an enlarged view of part B in FIG. 5), some of the support holes 11 of the lower tie plate 5 are connected to fuel rods 2a (hereinafter referred to as combined fuel rods) having male threaded lower end plugs 8a. It has a female screw hole 11a for coupling with a rod (referred to as a rod).
これらの結合燃料棒２ａの上部端栓９ａは、第６図（第
５図のＡ部分の拡大図）に示すように、上部タイプレー
ト４の支持孔１０を貫通して上方へ突出し、その突出部
分には保持ナツト１２をネジ止めさせるための雄ネジが
形成されている。なお、この結合燃料棒２ａは、チャン
ネルボックス１の各側壁に沿って一辺が２個になるよう
にして計８個配置されている。As shown in FIG. 6 (an enlarged view of part A in FIG. 5), the upper end plugs 9a of these combined fuel rods 2a penetrate the support hole 10 of the upper tie plate 4 and protrude upward. A male thread for screwing the retaining nut 12 is formed in the portion. A total of eight combined fuel rods 2a are arranged along each side wall of the channel box 1, with two on each side.
（発明が解決しようとする問題点）
ところで、このような構成の燃料集合体を燃焼終了後解
体するには、多数の燃料棒のうちまず結合燃料棒から解
体する。その手順は以下のようである。(Problems to be Solved by the Invention) By the way, in order to disassemble a fuel assembly having such a configuration after combustion is completed, the combined fuel rods are first disassembled from among the many fuel rods. The procedure is as follows.
■結合燃料棒２ａの上部端栓９ａの保持ナツト１２を外
す。(2) Remove the retaining nut 12 of the upper end plug 9a of the combined fuel rod 2a.
■上部タイプレート４を外す。■Remove upper tie plate 4.
■上部端栓９ａを治具にて把み、結合燃料棒２ａを回転
して下部端栓８ａを下部タイプレート５から外す。(2) Grasp the upper end plug 9a with a jig and rotate the combined fuel rod 2a to remove the lower end plug 8a from the lower tie plate 5.
ところが、近年、燃ａ：Ｅｌの高燃焼度化にとも４【い
、燃料の炉内滞在期間が長くなり、それにつれて前記ｈ
［ネジ付き下部端栓８ａとそれと結合するだめの下部タ
イプレート５の雄ネジ付き支持孔１１ａとがネジ山部分
で酸化膜生成などにより固着するという現象が生じる。However, in recent years, as the burnup of fuel a:El has increased, the stay period of the fuel in the reactor has become longer, and as a result, the
[A phenomenon occurs in which the threaded lower end plug 8a and the male threaded support hole 11a of the lower tie plate 5 that is connected thereto are stuck together due to the formation of an oxide film at the threaded portion.
そのため、上部端栓９ａを治具で把み結合態ｉｌｌ棒２
ａを回転しても、従来のトルクでは回転し得なくなる。Therefore, grasp the upper end plug 9a with a jig and connect it to the ill rod 2.
Even if a is rotated, it cannot be rotated with the conventional torque.
したがって、結合燃料棒２ａを回転、解体するためには
、外から見えている下部端栓８ａのバレル部１３を掴ま
えて回転せざるを得ない。しかし、下部端栓８ａのバレ
ル１３は円柱状の形状をしてあり、そのため把み治具で
トルクをかけるには滑り易く、回転力を伝えにくい構造
となっている。Therefore, in order to rotate and dismantle the combined fuel rods 2a, it is necessary to grasp and rotate the barrel portion 13 of the lower end plug 8a, which is visible from the outside. However, the barrel 13 of the lower end stopper 8a has a cylindrical shape, so it is easy to slip when applying torque with a gripping jig, and has a structure that makes it difficult to transmit rotational force.
また、この構造であると、無理に回転させた場合、雄ネ
ジ付き下部端栓８ａをねじ切ってしまうおそれがあり、
燃料棒の破損に繋がる。燃料棒が破損すると核***性生
成物が放出され、作業員が人垣の放射線被曝を受けるこ
とになる。In addition, with this structure, if the male threaded lower end plug 8a is rotated forcibly, there is a risk that the male threaded lower end plug 8a may be screwed off.
This will lead to damage to the fuel rods. When a fuel rod ruptures, fissile products are released, exposing workers to extensive radiation exposure.
本発明は、上記状況に鑑みてなされたもので、燃焼度が
１胃して下部端栓と下部タイプレートとの結合に固着が
生じても、解体が容易にかつ安全に行なえるような燃料
集合体を捉供することを目的とするものである。The present invention has been made in view of the above-mentioned situation, and provides a fuel that can be easily and safely dismantled even if the burnup level is 1 and the lower end plug and the lower tie plate become stuck together. The purpose is to capture and serve the collective.
［発明の構成］
（問題点を解決するための手段）
すなわち、本発明は筒状の燃料チャンネル内に上部タイ
プレートおよび下部タイプレートによって支持された多
数の燃料棒が設置された原子炉用燃料集合体において、
一部の燃料棒が多角柱状でかつ雌ネジを有する下部端栓
を有し、下部タイプレートが前記下部端栓と結合する部
位に雄ネジ突起部を有することを特徴とする原子炉用燃
料集合体に関する。[Structure of the Invention] (Means for Solving the Problems) That is, the present invention provides a fuel for a nuclear reactor in which a large number of fuel rods supported by an upper tie plate and a lower tie plate are installed in a cylindrical fuel channel. In the collective,
A fuel assembly for a nuclear reactor, characterized in that some of the fuel rods have a lower end plug having a polygonal columnar shape and a female thread, and a lower tie plate has a male threaded protrusion at a portion where it joins with the lower end plug. Regarding the body.
（作 用）
本発明の燃料集合体では、結合燃料棒の下部端栓が多角
柱状であるので、把み治具で掴んだ場合に角部で確実に
把］Δでき、回転力を伝え易くまた空滑りすることかな
い。また、従来のものとは逆に端栓側を雌ネジとしたの
で、下部端栓をねじ切って燃料棒を破ＪＦｔさせるおそ
れがない。なお、上記構）責の下部端栓にさらに複数の
タテ溝を入れると、下部端栓ネジ部と下部タイブレート
ネジ部の密着面積を減少させるので固着ツノを低下させ
ることができ、ざらに効果的である。(Function) In the fuel assembly of the present invention, since the lower end plug of the combined fuel rod is in the shape of a polygonal column, when it is gripped with a gripping jig, it can be gripped securely at the corners, making it easier to transmit rotational force. I don't think I'll ever skid again. In addition, since the end plug side is female threaded unlike the conventional one, there is no risk of the lower end plug being screwed off and causing the fuel rod to break. Furthermore, if a plurality of vertical grooves are added to the lower end plug of the above structure, the area of contact between the lower end plug screw part and the lower tie plate screw part can be reduced, and the sticking horn can be reduced, making it more effective. It is true.
（実施例） 本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明の燃料集合体の一実施例を説明する縦
断面図である。FIG. 1 is a longitudinal sectional view illustrating one embodiment of a fuel assembly of the present invention.
第１図に示されるように、本発明の燃料集合体は、従来
の燃料集合体と同様にチャンネルボックス２１内に多数
の燃料棒２がスペーサ２３オよび上。As shown in FIG. 1, in the fuel assembly of the present invention, a large number of fuel rods 2 are arranged in a channel box 21 with spacers 23 and above, similar to conventional fuel assemblies.
下部タイプレート２４．２５に支持されて配置されてい
る。燃料棒のうち上、下部タイプレートに結合する結合
燃料棒２２ａは六角柱状の下部端栓２８ａを有しており
、この下部端栓は第３図に示すように制ネジ３３を内蔵
している。It is supported and disposed on the lower tie plate 24,25. Among the fuel rods, the combined fuel rod 22a connected to the upper and lower tie plates has a hexagonal columnar lower end plug 28a, and this lower end plug has a built-in screw 33 as shown in FIG. .
第２図（Ａ）は上記燃料集合体の下部タイプレ−トの平
面図であり、（８）はそのＸ−Ｘ線に沿う縦断面図であ
る。第２図に示すように、下部タイプレート２５は燃料
棒２２と嵌口する支持孔３１．結合燃料棒２２ａと嵌口
する雄ネジ突起部３２を有している。FIG. 2(A) is a plan view of the lower tie plate of the fuel assembly, and FIG. 2(8) is a longitudinal sectional view taken along the line X--X. As shown in FIG. 2, the lower tie plate 25 has support holes 31 into which the fuel rods 22 are fitted. It has a male threaded protrusion 32 that fits into the combined fuel rod 22a.
第３図（＾）は結合燃料棒２２ａの下部端栓２８ａと下
部タイプレート２５とが結合したときの正面図、（Ｂ）
はそのｘ’−ｘ’線に沿う断面図である。この図に示す
ように、下部端栓２８ａは六角柱状で雌ネジ３３を内蔵
しており、この雌ネジ３３と下部タイプレート２５の雄
ネジ突起部３２とが結合している。Figure 3 (^) is a front view when the lower end plug 28a of the combined fuel rod 22a and the lower tie plate 25 are combined, (B)
is a sectional view taken along the line x'-x'. As shown in this figure, the lower end plug 28a has a hexagonal column shape and includes a female thread 33, and this female thread 33 is connected to the male thread protrusion 32 of the lower tie plate 25.
このような構成であるので、結合燃料棒の下部端栓２８
ａは、市販のスパナと類似の把み治具で容易にかつ確実
に把握することができ、また、確実に回転力を伝えるこ
とができる。With this configuration, the lower end plug 28 of the combined fuel rod
a can be easily and reliably grasped using a grasping jig similar to a commercially available spanner, and rotational force can be reliably transmitted.
また、下部タイプレート２５に雄ネジ突起部３２を、下
部端栓２８ａに雌ネジ３３を付しているため、固着か著
しい場合でも下部端栓２８ａ側でネジ切れるということ
がなく、燃料棒破損を防止することができる。In addition, since the lower tie plate 25 has a male screw protrusion 32 and the lower end plug 28a has a female screw 33, even if the lower end plug 28a is stuck, the screws will not break off on the lower end plug 28a side, and the fuel rod will not be damaged. can be prevented.
第４図は本発明の他の実施例を説明するためのもので、
（＾）はその下部端栓と下部タイプレートとが結合した
ときの正面図、（Ｂ）は（＾）図のＸ ＩＩＸ ＬＺ線
に沿う断面図である。FIG. 4 is for explaining another embodiment of the present invention,
(^) is a front view when the lower end plug and the lower tie plate are combined, and (B) is a sectional view taken along line X IIX LZ in figure (^).
この実施例では、結合燃料棒の下部端栓２８ｂは、前記
実施例と同様に雌ネジ３４を有する六角柱状のものであ
るが、この下部端栓には復数のタテ溝３５か下部タイプ
レートの雄ネジ突起部３２挿入位置に形成されている。In this embodiment, the lower end plug 28b of the combined fuel rod is in the shape of a hexagonal column having a female thread 34 as in the previous embodiment, but the lower end plug has a plurality of vertical grooves 35 or a lower tie plate. It is formed at the male screw protrusion 32 insertion position.
このため、下部端栓２８ｂの雌ネジ３４と下部タイプレ
ートの雄ネジ突起部３２との密着面積を減少することが
できる。密着面積が減少したため固着面積が減り、固着
力も減少する。したがって、解体時に必要な回転力が従
来よりも小さくてよい。したがって、この実施例では第
１の実施例よりざらに解体が容易かつ支今に行える。Therefore, the area of close contact between the female screw 34 of the lower end plug 28b and the male screw protrusion 32 of the lower tie plate can be reduced. Since the adhesion area is reduced, the adhesion area is reduced and the adhesion force is also reduced. Therefore, the rotational force required during disassembly may be smaller than that of the conventional method. Therefore, in this embodiment, disassembly can be performed more easily and easily than in the first embodiment.
［発明の効果］
以上説明したように、本発明の燃料集合体は、結合燃料
棒下部端栓を角柱状にしたので、燃料集合体の解体時に
下部端栓を確実に把握・回転でき、また従来とは反対に
下部端栓を雌ネジにし、下部タイプレートを雄ネジにし
て結合しているので、解体時にもし固着が著しい場合で
も、下部端栓をネジ切ることがない。したがって本発明
の燃料集合体では解体を容易かつ安全に行うことができ
る。[Effects of the Invention] As explained above, in the fuel assembly of the present invention, the lower end plug of the combined fuel rods is made into a prismatic shape, so the lower end plug can be reliably grasped and rotated when the fuel assembly is disassembled, and Contrary to the conventional method, the lower end plug has a female thread and the lower tie plate has a male thread to connect them, so even if there is significant adhesion during disassembly, the lower end plug will not have to be threaded. Therefore, the fuel assembly of the present invention can be easily and safely dismantled.
第１図は本発明の燃料集合体の一実施例の断面図、第２
図（Ａ）および（Ｂ）はそれぞれ上記実施例の下部タイ
プレートの平面図および縦断面図、第３図（＾）および
（Ｂ）はそれぞれ上記実施例の結合燃料棒上部端栓近傍
の正面図およびその断面図、第１図（八）および（Ｂ）
はそれぞれ本発明の他の実施例の結合燃料棒上部端栓近
傍の正面図および断面図、第５図は従来の燃料集合体の
縦断面図、第６図は従来の燃料集合体の結合燃料棒上部
端栓近傍の断面図、第７図は従来の燃料集合体の結合燃
料棒上部端栓近傍の断面図である。
２１・・・燃料チャンネル
２２・・・燃料棒
２２ａ・・・結合燃料棒
２４・・・上部タイブレート
２５・・・下部タイブレー１〜
２８・・・下部端栓
２８ａ、 ２８ｂ・・・結合燃料棒の下部端栓３２・・
・雄ネジ突起部
３３．３／ｌ・・・雌ネジ
３５・・・タテ溝
代理人 弁理士 則 近 憲 佑
何 第子丸 叶
第１図
（Ａ）
第２図
（Ａン
第８図
（Ａ）
第４図
第５図
第６図
第７図FIG. 1 is a sectional view of one embodiment of the fuel assembly of the present invention, and FIG.
Figures (A) and (B) are a plan view and longitudinal sectional view of the lower tie plate of the above embodiment, respectively, and Figures 3 (^) and (B) are front views of the upper end plug of the combined fuel rod of the above embodiment, respectively. Figures and their sectional views, Figures 1 (8) and (B)
5 is a longitudinal sectional view of a conventional fuel assembly, and FIG. 6 is a front view and a cross-sectional view of the vicinity of the upper end plug of a combined fuel rod according to another embodiment of the present invention. FIG. 6 is a vertical cross-sectional view of a conventional fuel assembly. FIG. 7 is a sectional view of the vicinity of the upper end plug of a combined fuel rod of a conventional fuel assembly. 21...Fuel channel 22...Fuel rod 22a...Combined fuel rod 24...Upper tie plate 25...Lower tie brake 1 to 28...Lower end plugs 28a, 28b...of the coupled fuel rod Lower end plug 32...
・Male thread protrusion 33.3/l...Female thread 35...Vertical groove Agent Patent attorney Nori Chika Nori Yuka Daishimaru Kano Figure 1 (A) Figure 2 (A-Figure 8) A) Figure 4 Figure 5 Figure 6 Figure 7
Claims (2)
び下部タイプレートによつて支持された多数の燃料棒が
設置された原子炉用燃料集合体において、一部の燃料棒
が多角柱状でかつ雌ネジを有する下部端栓を有し、下部
タイプレートが前記下部端栓と結合する部位に雄ネジ突
起部を有することを特徴とする原子炉用燃料集合体。(1) In a nuclear reactor fuel assembly in which a large number of fuel rods are installed in a cylindrical fuel channel and supported by an upper tie plate and a lower tie plate, some of the fuel rods are polygonal columnar and female. 1. A fuel assembly for a nuclear reactor, comprising a lower end plug having a screw, and a male screw protrusion at a portion where a lower tie plate is coupled to the lower end plug.
縦溝を有する特許請求の範囲第１項記載の原子炉用燃料
集合体。(2) The fuel assembly for a nuclear reactor according to claim 1, wherein the lower end plug, which is polygonal columnar and has a female thread, has a plurality of vertical grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62299910A JPH01142491A (en) | 1987-11-30 | 1987-11-30 | Fuel assembly for nuclear reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62299910A JPH01142491A (en) | 1987-11-30 | 1987-11-30 | Fuel assembly for nuclear reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01142491A true JPH01142491A (en) | 1989-06-05 |
Family
ID=17878406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62299910A Pending JPH01142491A (en) | 1987-11-30 | 1987-11-30 | Fuel assembly for nuclear reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01142491A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007515651A (en) * | 2003-12-22 | 2007-06-14 | アレヴァ エヌペ | Terminal end piece for a fuel assembly having a nose for directing a flow of cooling fluid and a corresponding fuel assembly |
-
1987
- 1987-11-30 JP JP62299910A patent/JPH01142491A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007515651A (en) * | 2003-12-22 | 2007-06-14 | アレヴァ エヌペ | Terminal end piece for a fuel assembly having a nose for directing a flow of cooling fluid and a corresponding fuel assembly |
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