JPS606894A - Nuclear fuel aggregate - Google Patents
Nuclear fuel aggregateInfo
- Publication number
- JPS606894A JPS606894A JP58112854A JP11285483A JPS606894A JP S606894 A JPS606894 A JP S606894A JP 58112854 A JP58112854 A JP 58112854A JP 11285483 A JP11285483 A JP 11285483A JP S606894 A JPS606894 A JP S606894A
- Authority
- JP
- Japan
- Prior art keywords
- nuclear fuel
- fuel assembly
- plate
- channel box
- thickness
- 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
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
- Catalysts (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の属する技術分野］
本発明は、核燃料集合体に係り、特に耐衝撃性を改善し
た核燃料集合体に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a nuclear fuel assembly, and particularly to a nuclear fuel assembly with improved impact resistance.
［従来技術とその問題点］
沸騰水型原子炉の炉心は、複数の核燃料集合体が規則正
しく配列されて構成されている。このような炉心を構成
する核燃料集合体は第１図に示すように正方形の流路箱
１内に燃料棒２が７×７ないし８×８本づつスペーサを
介して配列され、燃料棒２は上下部のタイブレー） ’
３ 、４ Ｋ 端栓５゜６を介して固定されている。燃
料棒２のうち、上下部タイブレートと結合されている結
合燃料棒は８本である。下部タイプレート４は燃料棒２
を支持するための孔７があけられている板状タイブレー
ト部４ａと本体部４ｂおよびノーズピース部４ｃとで形
成されている。また、上部タイブレー）３には核燃料集
合体を製造時、原子炉への装荷時あるいは燃料交換時に
吊と上げ運搬するだめのハンドル８が形成されている。[Prior art and its problems] The core of a boiling water reactor is composed of a plurality of nuclear fuel assemblies arranged regularly. In a nuclear fuel assembly constituting such a reactor core, as shown in FIG. upper and lower tiebrae)'
3, 4 K are fixed via end plugs 5°6. Of the fuel rods 2, eight combined fuel rods are connected to the upper and lower tie plates. Lower tie plate 4 is fuel rod 2
It is formed of a plate-like tie plate part 4a having a hole 7 for supporting the main body part 4b, and a nosepiece part 4c. Furthermore, a handle 8 is formed on the upper tiebrae 3 for lifting and transporting the nuclear fuel assembly when manufacturing the nuclear fuel assembly, loading it into a nuclear reactor, or exchanging fuel.
また、流路箱１の上端の一隅角には、その隅角で隣接す
る各側壁に平行な面をそなえ、弾力性のある爪片９ａを
有するチャンネルファスナ９が設けられている。なお、
核燃料集合体をハンドル８によシ吊シ上げる時、流路箱
１け、上部タイブレート３の柱部３ａを介して流路箱１
の上端の隅角の三角形板１ａにより吊シ上けられる。Further, a channel fastener 9 is provided at one corner of the upper end of the channel box 1, and has a surface parallel to each side wall adjacent to the corner, and has a resilient claw piece 9a. In addition,
When lifting the nuclear fuel assembly by the handle 8, the flow path box 1 is lifted through the column 3a of the upper tie plate 3.
It is hoisted up by the triangular plate 1a at the top corner.
このように構成された従来の核燃料集合体においては、
前記ハンドル８により吊り上げ運搬する際、何らかの理
由によシ核燃料集合体が落下して床等に衝突し、各部が
衝撃圧縮荷重を受け、各部はその相対強度に応じて変形
する。一般には、相対強度の低いノーズピース部４ｃと
板状プレート部４ａが変形するが、時には板状プレート
部４ａに支持固定された燃料棒２にも変形が及ぶことが
ある。In a conventional nuclear fuel assembly configured in this way,
When lifted and transported by the handle 8, the nuclear fuel assembly falls for some reason and collides with the floor, etc., and each part receives an impact compressive load, and each part deforms depending on its relative strength. Generally, the nosepiece portion 4c and the plate-shaped plate portion 4a, which have relatively low strength, are deformed, but sometimes the fuel rods 2 supported and fixed to the plate-shaped plate portion 4a are also deformed.
この場合燃料棒２に取シ付けられている端栓６が破断す
ることも考えられ、再び核燃料集合体を吊シ上げた時、
上部タイプレート３と結合燃料棒８本は吊シ上けられる
が、他の燃料棒２は吊り上げられない恐れがある。また
流路箱１も上部タイプレート３の柱部３ａによ）流路箱
１の上端二隅角にある三角形板１ａが破断することも考
えられ、吊り上げられなくなる恐れがある。In this case, the end plug 6 attached to the fuel rod 2 may break, and when the nuclear fuel assembly is lifted again,
Although the upper tie plate 3 and the eight combined fuel rods can be lifted up, the other fuel rods 2 may not be lifted up. In addition, the triangular plates 1a at the two upper corners of the channel box 1 may be broken by the pillars 3a of the upper tie plate 3, and there is a possibility that the channel box 1 will not be able to be lifted.
このような場合著しく作業能率が悪くなす、特に万一使
用済核燃料集合体を炉内や燃料プール等に落下させた場
合非常に取り出しが困難と々る。In such a case, work efficiency will be significantly reduced, and in particular, if the spent nuclear fuel assembly should fall into the reactor or fuel pool, it will be extremely difficult to remove it.
［発明の目的］
本発明は上述した従来の核燃料集合体の欠点を改良した
もので、万一の落下事故が生じても容易に集合体を吊シ
上けられる核燃料集合体を提供することを目的とする。[Object of the Invention] The present invention improves the above-mentioned drawbacks of the conventional nuclear fuel assembly, and aims to provide a nuclear fuel assembly that can be easily lifted up even in the event of a falling accident. purpose.
［発明の概要］
本発明は上述した点に鑑みてなされたもので、流路箱の
上部の三角形板を四隅自圧形成した核燃料集合体、まだ
、三角形板の板厚を流路箱の板厚の２〜３倍にした核燃
料集合体を提供することにある。[Summary of the Invention] The present invention has been made in view of the above-mentioned points, and provides a nuclear fuel assembly in which a triangular plate at the upper part of a channel box is formed under self-pressure at the four corners. The object of the present invention is to provide a nuclear fuel assembly that is two to three times thicker.
［発明の効果］
本発明によシ、大幅なコスト上昇や性能低下を来たすこ
となく、実使用状況での万一の落下事故においても流路
筒上部の三角形板は破断することなく再び吊り上げるこ
とができる。この時、流路箱の下部は、下部タイプレー
トの本体部に食い込んでいるので、万一、結合燃料棒の
端栓が破断しても、流路箱を介して集合体全体が一体と
なって吊シ上けられるという効果を有する。[Effects of the Invention] According to the present invention, the triangular plate at the top of the channel tube can be lifted up again without breaking even in the unlikely event of a fall accident in actual use, without causing a significant increase in cost or deterioration of performance. Can be done. At this time, the lower part of the channel box is wedged into the main body of the lower tie plate, so even if the end plug of the combined fuel rod breaks, the entire assembly will be integrated through the channel box. It has the effect of being able to be lifted up.
［発明の実施例］
以下この発明に係る一実施例を第２図にもとすいて説明
する。なお、第１図と同一部位については同符号をつけ
て説明を略する。図において、流路箱１の上部の四隅角
に三角形板１ａ、ｌｂが形成されている。三角形板１ａ
は従来より存在する三角形板であシ、三角形板１ｂは本
発明に係る三角形板である。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG. 2. Note that the same parts as in FIG. 1 are given the same reference numerals and the explanation will be omitted. In the figure, triangular plates 1a and lb are formed at the four corners of the upper part of the channel box 1. Triangular plate 1a
is a conventional triangular plate, and triangular plate 1b is a triangular plate according to the present invention.
このように構成された核燃料集合体で、ハンドル８によ
シ吊シ下げ運搬する際如落下事故が発生しても、上部タ
イプレート３の柱部３ａによるせん断力で破断する三角
形板１ａ、ｌｂのせん断力を受ける面積は従来の集合体
の２倍となシ、三角形板ｌａ、ｌｂは容易釦破断しない
。この時、核燃料集合体の各部は衝撃圧縮荷重を受け、
各部はその相対強度に応じて変形するが、燃料棒２に変
形が及ぶと、核燃料集合体の長さが短かくなり、流路箱
１の下部は下部タイブレー）Ｋ食い込むことになる。In the nuclear fuel assembly constructed in this manner, even if a fall accident occurs when the nuclear fuel assembly is suspended from the handle 8 and transported, the triangular plates 1a and lb will break due to the shearing force of the pillar portion 3a of the upper tie plate 3. The area subjected to shearing force is twice that of the conventional assembly, and the triangular plates la and lb do not easily break. At this time, each part of the nuclear fuel assembly receives an impact compression load,
Each part deforms depending on its relative strength, but when the fuel rod 2 is deformed, the length of the nuclear fuel assembly becomes shorter, and the lower part of the channel box 1 digs into the lower tiebrae (K).
また、下部タイプレートは外側へ変形するのでなお一層
強固に固着することになる。このため、結合燃料棒の端
栓が切断しても、流路箱１を介して核燃料集合体を吊シ
上げることができる。Furthermore, since the lower tie plate deforms outward, it is fixed even more firmly. Therefore, even if the end plug of the combined fuel rod is cut off, the nuclear fuel assembly can be lifted up via the channel box 1.
第３図は本５発明の他の実施例を示す図であシ流路箱１
の二隅角の三角形板ＩＣの板厚を流路箱の板厚の２〜３
倍にしである。板厚を２倍にすれば、上部タイプレート
３の柱部３ａによるせん断力を受ける面積は２倍となり
、第２図で示した実施例と同様の効果が得られる。ま／
こ、一般にぜん断破断は引張破断の３分の１の力で生じ
る。よって、三角形板３Ｃの板厚を流路箱１の板厚の３
倍以上にすると流路箱１が引張破断するため、三角形板
３Ｃの板厚は流路箱の板厚の２〜３倍でよい。FIG. 3 is a diagram showing another embodiment of the fifth invention.
The thickness of the triangular plate IC with the two corners of is 2 to 3 times the thickness of the channel box.
It's doubled. If the plate thickness is doubled, the area that receives the shearing force from the pillars 3a of the upper tie plate 3 will be doubled, and the same effect as the embodiment shown in FIG. 2 will be obtained. Ma/
Generally, shear fracture occurs with one-third the force of tensile fracture. Therefore, the thickness of the triangular plate 3C is 3 of the thickness of the channel box 1.
If the thickness is doubled or more, the channel box 1 will be tensilely broken, so the thickness of the triangular plate 3C may be 2 to 3 times the thickness of the channel box.
なお、第２図で示した実施例と第３図で示した実施例を
組み合わせると、一層効果が増大する。Note that if the embodiment shown in FIG. 2 and the embodiment shown in FIG. 3 are combined, the effect will be further increased.
第１図は従来の核燃料集合体の一部を切り欠いて示す側
面図、第２図はこの発明に係る一実施例の要部を拡大し
て示しだ平面図、第３図はこの発明の他の実、施例の要
部を拡大して示した断面図である。
ｌ・・・流路箱、 ２・・・燃料棒、
３・・・上部タイプレート、４・・・下部タイプレート
。
８・・・ハンドル。
代理人 弁理士 則 近 憲 佑（ほか１名）第 １
図
（θ−）
ｃｂ）
第 ２ 図
第３図FIG. 1 is a partially cutaway side view of a conventional nuclear fuel assembly, FIG. 2 is an enlarged plan view of the main part of an embodiment of the present invention, and FIG. 3 is a plan view of the present invention. FIG. 7 is an enlarged cross-sectional view of a main part of another example. l... Channel box, 2... Fuel rod, 3... Upper tie plate, 4... Lower tie plate. 8...Handle. Agent: Patent Attorney Noriyuki Chika (and 1 other person) No. 1
Figure (θ-) cb) Figure 2 Figure 3
Claims (2)
の核燃料集合体において、前記流路筒上部の四隅角に三
角形板を固着したことを特徴とする核燃料集合体。(1) A nuclear fuel assembly for a boiling water reactor in which nuclear fuel rods are housed in a channel box, characterized in that triangular plates are fixed to the four corners of the upper part of the channel tube.
たととを特徴とする特許請求の範囲第１項記載の核燃料
集合体。(2) The nuclear fuel assembly according to claim 1, wherein the thickness of the triangular plate is two to three times the thickness of the channel box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58112854A JPS606894A (en) | 1983-06-24 | 1983-06-24 | Nuclear fuel aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58112854A JPS606894A (en) | 1983-06-24 | 1983-06-24 | Nuclear fuel aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS606894A true JPS606894A (en) | 1985-01-14 |
Family
ID=14597188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58112854A Pending JPS606894A (en) | 1983-06-24 | 1983-06-24 | Nuclear fuel aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS606894A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176306A (en) * | 1987-01-13 | 1988-07-20 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓2O↓5 and method for producing the same |
| JPS63195119A (en) * | 1987-02-10 | 1988-08-12 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZnMgO↓5 and method for producing the same |
| JPS63295424A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound shown by tmgazn4o7 and having hexagonal lamellar structure and its production |
| JPS63295427A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓9O↓1↓2 and method for producing the same |
| JPS63295422A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound shown by tmgazn3o6 and having hexagonal lamellar structure and its production |
| JPS63295425A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓7O↓1↓0 and method for producing the same |
-
1983
- 1983-06-24 JP JP58112854A patent/JPS606894A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176306A (en) * | 1987-01-13 | 1988-07-20 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓2O↓5 and method for producing the same |
| JPS63195119A (en) * | 1987-02-10 | 1988-08-12 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZnMgO↓5 and method for producing the same |
| JPS63295424A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound shown by tmgazn4o7 and having hexagonal lamellar structure and its production |
| JPS63295427A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓9O↓1↓2 and method for producing the same |
| JPS63295422A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound shown by tmgazn3o6 and having hexagonal lamellar structure and its production |
| JPS63295425A (en) * | 1987-05-26 | 1988-12-01 | Natl Inst For Res In Inorg Mater | Compound having hexagonal layered structure represented by TmGaZn↓7O↓1↓0 and method for producing the same |
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