JPH0350996B2 - - Google Patents
Info
- Publication number
- JPH0350996B2 JPH0350996B2 JP58131549A JP13154983A JPH0350996B2 JP H0350996 B2 JPH0350996 B2 JP H0350996B2 JP 58131549 A JP58131549 A JP 58131549A JP 13154983 A JP13154983 A JP 13154983A JP H0350996 B2 JPH0350996 B2 JP H0350996B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel assembly
- rod
- insertion hole
- shaped body
- outer diameter
- 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 39
- 230000037431 insertion Effects 0.000 claims description 25
- 238000003780 insertion Methods 0.000 claims description 25
- 239000002826 coolant Substances 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims 1
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 238000004904 shortening Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002915 spent fuel radioactive waste 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)
- Chutes (AREA)
Description
〔発明の技術分野〕
本発明は、原子炉内において各種燃料集合体や
制御棒、中性子遮蔽体等の棒状体を所定の位置に
正確に装荷することができるようにした、燃料集
合体の如き棒状体の誤装荷防止装置に関する。
〔発明の技術的背景およびその問題点〕
一般に、原子炉容器内には、各種の燃料集合体
や制御棒、中性子遮蔽体などの棒状体が装荷され
るが、その装荷位置は予め決められており、燃料
交換時等において上記棒状体が常に所定の位置に
正しく装荷されることが必要である。
ところが、燃料交換作業は高放射能レベルの環
境のもとで行なわれるため、燃料集合体の棒状体
が正しく装荷されたか否かを直接的に確忍するこ
とは困難であり、何らかの誤装荷防止手段が必要
である。
第１図は、典型的な原子炉の燃料集合体等の支
持部を示す概念図であつて、原子炉容器１内に配
設された炉心支持構造２に各燃料集合体等に対応
して支持部材３が設けられており、その支持部材
３の挿入孔内に各燃料集合体４のエントランスノ
ズル５部を挿入することによつて、各燃料集合体
が炉心支持構造２上に直立して保持されている。
一方、冷却材は原子炉容器１の下部に直接され
た冷却材入口配管６から原子炉容器１内に流入
し、さらに炉心支持構造２内に流入し、支持部材
３の側壁部に設けられた冷却材流入口７およびエ
ントランスノズル５に設けられた開口８を経て燃
料集合体４内に流入し、その燃料集合体４内で温
度上昇した後上記燃料集合体４から流出して、図
示しない冷却材出口配管から原子炉容器１外に導
出される。
第２図は上記支持構造２に装着支持された燃料
集合体４のエントランスノズル５部を拡大して示
す図であつて、支持機構２に固設された支持部材
３には、上記支持機構２の上部支持板９に穿設さ
れた開口９ａに連通するとともにエントランスノ
ズル５を挿入する挿入孔１０が形成されている。
上記挿入孔１０の上部には燃料集合体の装荷場所
に応じて所定の内径を有する上部嵌合部１０ａが
形成され、また下端部には上記上部嵌合部１０ａ
の内径より小さな内径を有する下部嵌合部１０ｂ
が形成され、上記両嵌合部１０ａ，１０ｂ間の大
内径部外周に冷却材流入口７が穿設されている。
一方、燃料集合体４のエントランスノズル５に
は、そのエントランスノズル５が挿入孔１０に挿
入されたとき上記上部嵌合部１０ａと対応する位
置に、その上部嵌合部１０ａの内径よりやゝ小さ
な外径D1を有する第１の係合部５ａが形成され、
さらに下端部には前記下部嵌合部１０ｂの内径よ
りやゝ小さな外径D2を有する第２の係合部５ｂ
が形成されており、両係合部５ａ，５ｂ間に両者
の中間の外径を有する胴部５ｃが形成され、その
胴部５ｃに開口８が形成されている。
しかして、所定の燃料集合体４を原子炉容器内
の所定位置に装荷した場合、上部嵌合部１０ａお
よび下部嵌合部１０ｂにエントランスノズル５の
第１の係合部５ａおよび第２の係合部５ｂがそれ
ぞれ嵌合係合し、その燃料集合体の保持が行なわ
れる。
ところで、上記各支持部材３における挿入孔１
０の上部嵌合部１０ａ、下部嵌合部１０ｂの内径
寸法は、炉容器内の位置に応じてその組合わせが
複数種類に変えられ、これに応じてその場所に装
荷される燃料集合体の第１の係合部５ａ、および
第２の係合部５ｂの外径寸法D1，D2もそれぞれ
変更せしめられており、これによつて或る位置の
支持部材３に対して所定以外の燃料集合体のエン
トランスノズルが完全に挿入されることがないよ
うにして、誤装荷防止を行なうことができるよう
にしてある。
ところが、このようなものにおいては、エント
ランスノズルの両係合部５ａ，５ｂの間に胴部が
あり、その胴部に冷却材流入用の開口８が設けら
れているので、該装荷を検出するための上部嵌合
部１０ａと下部嵌合部１０ｂに対応する長さに加
えて、上記胴部５ｃも十分な冷却材流路を確保す
るために或る程度以上の長さが必要であり、エン
トランスノズル５部全体の長さが大きなものとな
る等の不都合がある。
さらに大型の原子炉では、区別すべき挿入位置
の種類が増えるため、それに対処するために、第
３図に示すように第２の係合部５ｂの下端にさら
に円筒状部５ｄを突出させ、この円筒状部５ｄの
外周を支持部材３の挿入孔１０の底部にさらに形
成された凹部１０ｃと係合させるとともに、その
凹部１０ｃの底部から突設された突起１０ｄが上
記円筒状部５ｄ内に挿入されるようにし、上記円
筒状の円筒状部５ｄの外径寸法D3と内径法D4と
の組合せを加えるようにすることも提案されてい
る。
しかしながら、このような場合にはエントラン
スノズル部の長さがさらに大きくなり、燃料集合
体の全長が長くなつて、原子炉容器の高さをでき
るだけ小さくする上での大きな障害となる等の問
題がある。
〔発明の目的〕
本発明はこのような点に鑑み、燃料集合体の如
き棒状体のエントランスノズル部の長さを短かく
して棒状体の全長を短縮することによつて原子炉
容器の高さを小さくして建設費、耐震性を向上さ
せることができるとともに、区別すべき挿入位置
の種類の増加にも十分対処し得るようにした、燃
料集合体等の棒状体の誤装荷防止装置を得ること
を目的とする。
〔発明の概要〕
本発明は、燃料集合体の如き棒状体の下端部に
設けられたエントランスノズル部に、炉心支持構
造に設けられた支持部材の挿入孔の上部嵌合部に
挿入係合される、所定外径を有する第１の係合部
と、上記挿入孔の下部嵌合部に挿入係合される、
第１の係合部より小さな外径を有する第２の係合
部とを設けるとともに、上記第２の係合部の下端
面に、前記挿入孔の底部に設けられた筒状の突起
部と係合する環状溝を形成し、上記第の係合部お
よび第２の係合部の外径寸法並びに環状溝の内外
径寸法と、これらに対応する挿入孔及び筒状突起
部の各部寸法を前記棒状体の装荷位置により異な
るようにしたことを特徴とするものであつて、上
記棒状体を所定の装荷位置以外の所に装荷しよう
としてもエントランスノズル部が支持部材の挿入
孔内に完全に挿入されることがなく、誤装荷を直
ちに検知し得るようにしたものである。
〔発明の実施例〕
以下、第４図および第５図を参照して本発明の
実施例について説明する。
第４図において、原子炉容器内に配列される燃
料集合体４に対処して炉心支持構造２に設けられ
た支持部材３には、上方から燃料集合体４のエン
トランスノズル５部が挿入される挿入孔１０が形
成されている。上記挿入孔１０の上半部は、その
支持部材３の原子炉容器内の位置に応じて設定さ
れた所定の内径とされた上部嵌合部１０ａとさ
れ、またその下部に上記上部嵌合部１０ａより内
径が小さい下部嵌合部１０ｂが形成され、さらに
その下部嵌合部１０ｂの底壁には筒状の突起部１
１が突設されている。
一方、燃料集合体４のエントランスノズル５に
は支持部材３の上部嵌合部１０ａの内径よりわず
かに小さな外径寸法D1を有し、エントランスノ
ズル５が挿入孔１０内に挿入されたとき上部嵌合
部１０ａと係合する第１の係合部５ａが形成され
ており、その第１の係合部５ａの直下方に、下部
嵌合部１０ｂの内径よりわずかに小さな外径寸法
D2を有し下部嵌合部１０ｂと係合する第２の係
合部５ｂが形成されている。さらに上記第２の係
合部５ｂの下端面には、上記筒状の突起部１１が
挿入係合し得る大径寸法D3、小径寸法D4を有す
る環状溝１２が形成されている。
そして、支持部材３の前記上部嵌合部１０ａの
外側壁部に冷却材流入口７が設けられ、エントラ
ンスノズル５には第１の係合部５ａに冷却材が流
入する開口８が穿設されている。
しかして、所定の燃料集合体４を原子炉容器内
の所定位置に装荷した場合、上部嵌合部１０ａお
よび下部嵌合部１０ｂにエントランスノズル５の
第１の係合部５ａおよび第２の係合部５ｂがそれ
ぞれ嵌合係合するとともに、突起部１１と環状溝
１２が係合し、その燃料集合体の保持が行なわれ
る。
そこで、エントランスノズルの第１および第２
の係合部５ａ，５ｂの外径寸法D1，D2、環状溝
１２の大径寸法D3、小径寸法D4の組合せを第１
表のように設定し、これらの燃料集合体が装荷さ
れる位置の支持部材の上部嵌合部１０ａ、下部嵌
合部１０ｂ並びに突起部１１の寸法を上記寸法に
対応するようにしておけば、Ａ−ｉ（ｉ＝１〜３）
位置のものがＢ−ｉ，Ｃ−ｉ，Ｄ−ｉの位置に入
ろうとすると、第１の係合部（D1寸法部）によ
つてその挿入が阻止される。逆にＢ−ｉ，Ｃ−
ｉ，Ｄ−ｉ位置のものがＡ−ｉ位置へ入ろうとす
ると第２の係合部（D2寸法部）によつてその挿
入が阻止される。
また、Ａ−１，Ａ−２，Ａ−３の間では、Ａ−
１位置のものがＡ−２，Ａ−３の位置に挿入され
ようとすると、環状溝１２の小径寸法D4が突起
部１１によつて阻止され、Ａ−２，Ａ−３のもの
がＡ−１の位置に挿入されようとすると、環状溝
１２の大径寸法D3が突起部１１によつて阻止さ
れ、燃料集合体の所定位置以外の場所への装荷す
なわち誤装荷が防止される。しかして、この場合
第３図に示す従来の装置における円筒状部５ｄを
設ける必要がない。
[Technical Field of the Invention] The present invention relates to a fuel assembly such as a fuel assembly that enables rod-shaped bodies such as various fuel assemblies, control rods, and neutron shielding bodies to be loaded accurately at predetermined positions in a nuclear reactor. The present invention relates to a device for preventing erroneous loading of rod-shaped bodies. [Technical background of the invention and its problems] Generally, various rod-shaped bodies such as fuel assemblies, control rods, and neutron shields are loaded inside a nuclear reactor vessel, but their loading positions are predetermined. Therefore, it is necessary that the rod-shaped body is always correctly loaded in a predetermined position when changing fuel or the like. However, since refueling work is carried out in an environment with high radioactivity levels, it is difficult to directly confirm whether or not the rods of the fuel assembly have been loaded correctly. A means is necessary. FIG. 1 is a conceptual diagram showing the supporting parts of fuel assemblies, etc. of a typical nuclear reactor. A support member 3 is provided, and by inserting the entrance nozzle 5 of each fuel assembly 4 into the insertion hole of the support member 3, each fuel assembly is erected on the core support structure 2. Retained. On the other hand, the coolant flows into the reactor vessel 1 from the coolant inlet pipe 6 that is directly connected to the lower part of the reactor vessel 1, and further flows into the core support structure 2, which is provided on the side wall of the support member 3. The coolant flows into the fuel assembly 4 through the coolant inlet 7 and the opening 8 provided in the entrance nozzle 5, rises in temperature within the fuel assembly 4, and then flows out of the fuel assembly 4 for cooling (not shown). The material is led out of the reactor vessel 1 from the material outlet piping. FIG. 2 is an enlarged view showing the entrance nozzle 5 portion of the fuel assembly 4 mounted and supported on the support structure 2, and the support member 3 fixed to the support structure 2 includes the support structure 2. An insertion hole 10 is formed which communicates with an opening 9a formed in the upper support plate 9 and into which the entrance nozzle 5 is inserted.
An upper fitting part 10a having a predetermined inner diameter depending on the loading location of the fuel assembly is formed at the upper part of the insertion hole 10, and the upper fitting part 10a is formed at the lower end of the insertion hole 10.
The lower fitting part 10b has an inner diameter smaller than the inner diameter of
A coolant inlet 7 is formed on the outer periphery of the large inner diameter portion between the two fitting portions 10a and 10b. On the other hand, in the entrance nozzle 5 of the fuel assembly 4, when the entrance nozzle 5 is inserted into the insertion hole 10, at a position corresponding to the upper fitting part 10a, there is a hole slightly smaller than the inner diameter of the upper fitting part 10a. A first engaging portion 5a having an outer diameter D1 is formed,
Furthermore, a second engaging part 5b having an outer diameter D2 slightly smaller than the inner diameter of the lower fitting part 10b is provided at the lower end.
A body portion 5c having an outer diameter intermediate between the engaging portions 5a and 5b is formed, and an opening 8 is formed in the body portion 5c. Therefore, when a predetermined fuel assembly 4 is loaded at a predetermined position in the reactor vessel, the first engaging portion 5a and the second engaging portion of the entrance nozzle 5 are connected to the upper fitting portion 10a and the lower fitting portion 10b. The joint portions 5b fit into each other to hold the fuel assembly. By the way, the insertion holes 1 in each of the above-mentioned support members 3
The inner diameter dimensions of the upper fitting part 10a and the lower fitting part 10b of No. 0 can be changed into a plurality of combinations depending on the position in the reactor vessel. The outer diameter dimensions D 1 and D 2 of the first engaging portion 5a and the second engaging portion 5b are also changed, so that the supporting member 3 at a certain position has a different diameter than the specified one. The entrance nozzle of the fuel assembly is prevented from being completely inserted to prevent incorrect loading. However, in such a device, there is a body between the engaging portions 5a and 5b of the entrance nozzle, and the body is provided with an opening 8 for inflowing the coolant, so that the loading can be detected. In addition to the length corresponding to the upper fitting part 10a and lower fitting part 10b, the body part 5c also needs to have a certain length or more in order to ensure a sufficient coolant flow path. There are disadvantages such as the length of the entire entrance nozzle 5 section becoming long. Furthermore, in larger nuclear reactors, the number of types of insertion positions to be distinguished increases, so in order to cope with this, a cylindrical part 5d is further protruded from the lower end of the second engaging part 5b as shown in FIG. The outer periphery of this cylindrical portion 5d is engaged with a recess 10c further formed at the bottom of the insertion hole 10 of the support member 3, and a protrusion 10d protruding from the bottom of the recess 10c is inserted into the cylindrical portion 5d. It has also been proposed to add a combination of the outer diameter dimension D 3 and the inner diameter dimension D 4 of the cylindrical portion 5d. However, in such a case, the length of the entrance nozzle becomes even larger, which increases the overall length of the fuel assembly, which poses a major obstacle in reducing the height of the reactor vessel as much as possible. be. [Object of the Invention] In view of these points, the present invention reduces the height of a reactor vessel by shortening the length of the entrance nozzle part of a rod-shaped body such as a fuel assembly and shortening the overall length of the rod-shaped body. To obtain a device for preventing erroneous loading of rod-shaped bodies such as fuel assemblies, which can be made smaller to improve construction costs and earthquake resistance, and can sufficiently deal with an increase in the number of types of insertion positions to be distinguished. With the goal. [Summary of the Invention] The present invention provides an entrance nozzle portion provided at the lower end of a rod-shaped body such as a fuel assembly, which is inserted into and engaged with an upper fitting portion of an insertion hole of a support member provided in a core support structure. a first engaging portion having a predetermined outer diameter; and a first engaging portion having a predetermined outer diameter and being inserted and engaged with a lower fitting portion of the insertion hole.
a second engaging part having a smaller outer diameter than the first engaging part, and a cylindrical protrusion provided at the bottom of the insertion hole on the lower end surface of the second engaging part. An annular groove to be engaged is formed, and the outer diameter dimensions of the first engaging part and the second engaging part, the inner and outer diameter dimensions of the annular groove, and the corresponding dimensions of each part of the insertion hole and the cylindrical protrusion are determined. The loading position of the rod-shaped body varies depending on the loading position, and even if the rod-shaped body is loaded at a location other than the predetermined loading position, the entrance nozzle part is not completely inserted into the insertion hole of the support member. It is designed so that incorrect loading can be detected immediately without being inserted. [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 and 5. In FIG. 4, an entrance nozzle 5 portion of the fuel assembly 4 is inserted from above into a support member 3 provided in the core support structure 2 in correspondence with the fuel assembly 4 arranged in the reactor vessel. An insertion hole 10 is formed. The upper half of the insertion hole 10 is an upper fitting part 10a having a predetermined inner diameter set according to the position of the support member 3 in the reactor vessel, and the upper fitting part 10a is formed at the lower part of the upper fitting part 10a. A lower fitting part 10b having an inner diameter smaller than that of 10a is formed, and a cylindrical protrusion 1 is formed on the bottom wall of the lower fitting part 10b.
1 is provided protrudingly. On the other hand, the entrance nozzle 5 of the fuel assembly 4 has an outer diameter dimension D1 slightly smaller than the inner diameter of the upper fitting part 10a of the support member 3, so that when the entrance nozzle 5 is inserted into the insertion hole 10, A first engaging portion 5a that engages with the fitting portion 10a is formed, and an outer diameter slightly smaller than the inner diameter of the lower fitting portion 10b is formed directly below the first engaging portion 5a.
A second engaging portion 5b having a diameter D 2 and engaging with the lower fitting portion 10b is formed. Furthermore, an annular groove 12 having a large diameter dimension D 3 and a small diameter dimension D 4 into which the cylindrical protrusion 11 can be inserted and engaged is formed on the lower end surface of the second engaging portion 5b. A coolant inlet 7 is provided on the outer wall of the upper fitting portion 10a of the support member 3, and an opening 8 is provided in the entrance nozzle 5 through which the coolant flows into the first engaging portion 5a. ing. Therefore, when a predetermined fuel assembly 4 is loaded at a predetermined position in the reactor vessel, the first engaging portion 5a and the second engaging portion of the entrance nozzle 5 are connected to the upper fitting portion 10a and the lower fitting portion 10b. The mating portions 5b are fitted into each other, and the protruding portion 11 and the annular groove 12 are engaged, thereby holding the fuel assembly. Therefore, the first and second entrance nozzles
The combination of the outer diameter dimensions D 1 and D 2 of the engaging portions 5a and 5b, the large diameter dimension D 3 and the small diameter dimension D 4 of the annular groove 12 is the first
If the settings are made as shown in the table and the dimensions of the upper fitting part 10a, lower fitting part 10b and projection part 11 of the support member at the position where these fuel assemblies are loaded correspond to the above dimensions, A-i (i=1-3)
When the object at the position B-i, C-i, or D-i attempts to enter the position B-i, C-i, or D-i, the first engaging portion ( D1 dimension portion) prevents the insertion. On the contrary, B-i, C-
When the object at the i, D-i position attempts to enter the A-i position, the second engaging portion ( D2 dimension portion) prevents the insertion. Also, between A-1, A-2, and A-3, A-
When the one at position 1 is about to be inserted into positions A-2 and A-3, the small diameter dimension D 4 of the annular groove 12 is blocked by the protrusion 11, and the one at A-2 and A-3 is inserted into the position A-2 and A-3. When an attempt is made to insert the fuel assembly into the -1 position, the large diameter dimension D3 of the annular groove 12 is blocked by the protrusion 11, thereby preventing loading of the fuel assembly to a location other than the predetermined location, that is, incorrect loading. In this case, there is no need to provide the cylindrical portion 5d in the conventional device shown in FIG.
【表】【table】
本発明は上述のように構成したので、燃料集合
体等の装荷されるべき位置の種類の増加に対応し
て、十分エントランスノズル部の形状寸法に変化
をもたせることができ、しかも、従来のようにエ
ントランスノズルの下部に形成された第２の係合
部の下端にさらに円筒状部を突設する必要がな
く、エントランスノズル部を短縮化でき、それに
よつて棒状体の全長を短縮することができて、原
子炉容器の高さや使用済燃料の取扱い施設を小さ
くすることができ、建設費の低減、耐震性の向上
を画ることができる。
Since the present invention is configured as described above, it is possible to sufficiently change the shape and dimensions of the entrance nozzle portion in response to an increase in the types of locations where fuel assemblies and the like are to be loaded, and moreover, There is no need to further protrude a cylindrical part from the lower end of the second engaging part formed at the lower part of the entrance nozzle, and the entrance nozzle part can be shortened, thereby shortening the overall length of the rod-shaped body. As a result, the height of the reactor vessel and spent fuel handling facilities can be reduced, reducing construction costs and improving earthquake resistance.
第１図は典型的な原子炉の燃料集合体等の支持
部を示す概念図、第２図および第３図はそれぞれ
従来の燃料集合体のエントランスノズル部と支持
部材との嵌合状態を示す図、第４図および第５図
はそれぞれ本発明の誤装荷装置を示す縦断面図で
ある。
２……炉心支持構造、３……支持部材、４……
燃料集合体、５……エントランスノズル、５ａ…
…第１の係合部、５ｂ……第２の係合部、１０…
…挿入孔、１０ａ……上部嵌合部、１０ｂ……下
部嵌合部、１１……突起部、１２……環状溝、１
３……下部端栓。
Fig. 1 is a conceptual diagram showing the support part of a typical nuclear reactor fuel assembly, etc. Figs. 2 and 3 show the fitting state of the entrance nozzle part and the support member of a conventional fuel assembly, respectively. 4 and 5 are longitudinal cross-sectional views showing the misloading device of the present invention, respectively. 2... Core support structure, 3... Support member, 4...
Fuel assembly, 5...Entrance nozzle, 5a...
...First engaging part, 5b... Second engaging part, 10...
...Insertion hole, 10a... Upper fitting part, 10b... Lower fitting part, 11... Protrusion, 12... Annular groove, 1
3...Lower end plug.
Claims (1)
たエントランスノズル部に、炉心支持構造に設け
られた支持部材の挿入孔の上部嵌合部に挿入係合
される、所定外径を有する第１の係合部と、上記
挿入孔の下部嵌合部に挿入係合される、第１の係
合部より小さな外径を有する第２の係合部とを設
けるとともに、上記第２の係合部の下端面に、前
記挿入孔の底部に設けられた筒状の突起部と係合
する環状溝を形成し、上記第１の係合部および第
２の係合部の外径寸法並びに環状溝の内外径寸法
と、これらに対応する挿入孔及び筒状突起部の各
部寸法を前記棒状体の装架位置により異なるよう
にしたことを特徴とする、燃料集合体の如き棒状
体の誤装荷防止装置。 ２ 第１の係合部に冷却材流入口が形成されてい
ることを特徴とする、特許請求の範囲第１項記載
の燃料集合体の如き棒状体の誤装荷防止装置。 ３ エントランスノズルの下部端栓に第１および
第２の係合部が設けられていることを特徴とす
る、特許請求の範囲第１項記載の燃料集合体の如
き棒状体の誤装荷防止装置。 ４ 挿入孔の底部に設けられた突起部は円筒状を
呈していることを特徴とする、特許請求の範囲第
１項乃至第３項のいずれかに記載の燃料集合体の
如き棒状体の誤装荷防止装置。 ５ 突起部は多角筒状を呈し、環状溝は多角形状
の溝であることを特徴とする、特許請求の範囲第
１項乃至第３項のいずれかに記載の燃料集合体の
如き棒状体の誤装荷防止装置。[Scope of Claims] 1. An entrance nozzle portion provided at the lower end of a rod-shaped body such as a fuel assembly is inserted into and engaged with an upper fitting portion of an insertion hole of a support member provided in a core support structure. A first engaging portion having a predetermined outer diameter, and a second engaging portion having a smaller outer diameter than the first engaging portion, which is inserted into and engaged with the lower fitting portion of the insertion hole, and , an annular groove that engages with a cylindrical protrusion provided at the bottom of the insertion hole is formed in the lower end surface of the second engagement part, and the first engagement part and the second engagement part A fuel assembly characterized in that the outer diameter of the rod, the inner and outer diameter of the annular groove, and the corresponding dimensions of the insertion hole and the cylindrical protrusion vary depending on the mounting position of the rod-shaped body. A device to prevent incorrect loading of rod-shaped objects such as. 2. A device for preventing erroneous loading of a rod-shaped body such as a fuel assembly according to claim 1, characterized in that a coolant inlet is formed in the first engaging portion. 3. A device for preventing erroneous loading of a rod-shaped body such as a fuel assembly according to claim 1, characterized in that the lower end plug of the entrance nozzle is provided with first and second engaging portions. 4. An error in a rod-shaped body such as a fuel assembly according to any one of claims 1 to 3, characterized in that the protrusion provided at the bottom of the insertion hole has a cylindrical shape. Anti-loading device. 5. A rod-shaped body such as a fuel assembly according to any one of claims 1 to 3, wherein the protrusion has a polygonal cylindrical shape and the annular groove is a polygonal groove. Misloading prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58131549A JPS6022688A (en) | 1983-07-19 | 1983-07-19 | Preventive device for defective charge of cylindrical body such as fuel aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58131549A JPS6022688A (en) | 1983-07-19 | 1983-07-19 | Preventive device for defective charge of cylindrical body such as fuel aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6022688A JPS6022688A (en) | 1985-02-05 |
| JPH0350996B2 true JPH0350996B2 (en) | 1991-08-05 |
Family
ID=15060671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58131549A Granted JPS6022688A (en) | 1983-07-19 | 1983-07-19 | Preventive device for defective charge of cylindrical body such as fuel aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4371524A1 (en) | 2022-11-15 | 2024-05-22 | J. Morita Manufacturing Corporation | Data processing apparatus, data processing method, data processing program, and data processing system |
-
1983
- 1983-07-19 JP JP58131549A patent/JPS6022688A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4371524A1 (en) | 2022-11-15 | 2024-05-22 | J. Morita Manufacturing Corporation | Data processing apparatus, data processing method, data processing program, and data processing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6022688A (en) | 1985-02-05 |
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