JPH07140280A - Foreign matter countermeasuring type pwr fuel assembly - Google Patents
Foreign matter countermeasuring type pwr fuel assemblyInfo
- Publication number
- JPH07140280A JPH07140280A JP5314545A JP31454593A JPH07140280A JP H07140280 A JPH07140280 A JP H07140280A JP 5314545 A JP5314545 A JP 5314545A JP 31454593 A JP31454593 A JP 31454593A JP H07140280 A JPH07140280 A JP H07140280A
- Authority
- JP
- Japan
- Prior art keywords
- foreign matter
- water flow
- fuel assembly
- holes
- plate
- 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.)
- Granted
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
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Nozzles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加圧水型原子炉（ＰＷ
Ｒ）にて使用される燃料集合体に係り、詳しくは、下部
ノズルの流水孔を通って流出する冷却水中の異物を捕捉
する異物対策型ＰＷＲ燃料集合体に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a pressurized water reactor (PW).
R), and more specifically, to a foreign matter countermeasure type PWR fuel assembly that captures foreign matter in the cooling water flowing out through the water flow holes of the lower nozzle.
【０００２】[0002]
【従来の技術】加圧水型原子炉にて使用される燃料集合
体は、多数の燃料棒を並列し、かつシンブル管等を混入
して複数の支持格子で支持せしめた燃料棒束部と、それ
を固定する上部ノズルと下部ノズルとで構成されてい
る。そして、上記下部ノズル６′は、図６に示す如く、
燃料集合体の骨格となる上記シンブル管を固定する複数
のシンブルスクリュー穴Ｓと多数の流水孔７′とを有す
る四角形のアダプタプレート８′と、該アダプタプレー
ト８′のコーナー部から垂下し、下部炉心板Ｂとの間に
所定の間隔を設けて上記アダプタプレート８′を支持せ
しめる４本の脚部とによって構成されている。2. Description of the Related Art A fuel assembly used in a pressurized water reactor includes a fuel rod bundle portion in which a large number of fuel rods are arranged in parallel, and thimble tubes and the like are mixed and supported by a plurality of support grids. It is composed of an upper nozzle and a lower nozzle for fixing. The lower nozzle 6'is, as shown in FIG.
A rectangular adapter plate 8'having a plurality of thimble screw holes S for fixing the thimble tube serving as the skeleton of the fuel assembly and a large number of water flow holes 7 ', and hanging from a corner portion of the adapter plate 8', It is constituted by four legs which support the adapter plate 8'at a predetermined distance from the core plate B.
【０００３】一方、上記加圧水型原子炉においては、冷
却水は図５に示す如き下部炉心板Ｂに設けられた炉心板
流水孔Ｈより燃料集合体の下部ノズル６′に至り、この
下部ノズル６′に至った冷却水は、図６に示すような下
部ノズル６′にあけられた前記多数の流水孔７′より燃
料集合体内へ流入し、支持格子・燃料棒の間を通って上
部ノズルに至る。そして、上部ノズルの流水孔を通過し
た冷却水は蒸気発生器等を経て下部炉心板Ｂへ至り循環
する。On the other hand, in the above pressurized water reactor, the cooling water reaches the lower nozzle 6'of the fuel assembly from the core plate water flow hole H provided in the lower core plate B as shown in FIG. The cooling water that has reached the ′ ′ flows into the fuel assembly through the large number of water flow holes 7 ′ formed in the lower nozzle 6 ′ as shown in FIG. Reach Then, the cooling water that has passed through the water flow holes of the upper nozzle reaches the lower core plate B through the steam generator or the like and is circulated.
【０００４】ところで、この冷却水の系統にまぎれ込ん
だ金属片等の異物は、下部ノズルの流水孔を通過したの
ちは、燃料集合体の燃料棒の間に引掛かることが多く、
この引掛かった異物は、冷却水流によって激しく振動
し、燃料棒を傷つけることがある。そこで、従来におい
ては、この異物の燃料体内への流入を防ぐために、例え
ば図４に示すように、上記下部ノズルのアダプタプレー
ト８′上に最下部の支持格子３′を近接させ、この支持
格子３′の格子板９′によって前記流水孔７′の出口を
十文字状に細分化している。By the way, foreign matter such as metal pieces mixed in the cooling water system is often caught between the fuel rods of the fuel assembly after passing through the water flow hole of the lower nozzle.
The foreign matter thus caught may violently vibrate by the flow of the cooling water and damage the fuel rod. Therefore, in the prior art, in order to prevent the foreign matter from flowing into the fuel body, for example, as shown in FIG. 4, the lowermost support grid 3'is brought close to the adapter plate 8'of the lower nozzle, and the support grid 3'is provided. The outlet of the water flow hole 7'is subdivided into a cross shape by a 3'lattice plate 9 '.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
如き異物対策を図った燃料集合体においても、上記細分
化された流路より小さい異物は上記下部ノズルを通り抜
けることが可能である。即ち、この小さな流路を抜ける
立方体または球状に近いような短尺の異物は、上方の他
の支持格子も通過するために前記損傷の原因とはなりに
くいが、特にワイヤ片等の長尺棒状の異物Ｔは、図４に
示すように、縦の状態では上記細分化経路を通り抜ける
ことができ、一方、横の状態となった場合は上方の他の
支持格子に引掛かり、前記燃料棒の損傷の原因となる可
能性がある。However, even in the fuel assembly in which the measure against foreign matter is taken as described above, foreign matter smaller than the subdivided flow passage can pass through the lower nozzle. That is, a cubic foreign substance passing through this small flow path or a short foreign substance close to a spherical shape is unlikely to cause the damage because it also passes through the other supporting grids above, but in particular, a long rod-shaped rod such as a wire piece. As shown in FIG. 4, the foreign matter T can pass through the above-mentioned subdivided path in the vertical state, while when in the horizontal state, the foreign matter T is caught by another supporting grid above and damages the fuel rod. May cause
【０００６】本発明は上記の如き実状に鑑み、下部ノズ
ルの流水孔に新規な構成を見出すことによって、上記ワ
イヤ片等の長尺棒状の異物をも上記下部ノズルで捕捉せ
しめることを目的とするものである。In view of the above situation, it is an object of the present invention to find a new structure in the water flow hole of the lower nozzle so that the long rod-shaped foreign matter such as the wire piece can be captured by the lower nozzle. It is a thing.
【０００７】[0007]
【課題を解決するための手段】即ち、上記目的に適合す
る本発明のＰＷＲ燃料集合体は、前述の如き多数の流水
孔を有する下部ノズルのアダプタプレート上に、最下部
の支持格子を近接させ、該支持格子の格子板にて上記流
水孔出口を細分化してなる燃料集合体において、上記流
水孔の穿向角度を、上記支持格子の流路方向に対して傾
斜せしめたことを特徴とする。That is, in the PWR fuel assembly of the present invention which meets the above-mentioned object, the lowermost support grid is brought close to the adapter plate of the lower nozzle having a large number of water holes as described above. A fuel assembly in which the outlets of the water flow holes are subdivided by a lattice plate of the support grid, wherein the angle of divergence of the water flow holes is inclined with respect to the flow direction of the support grid. .
【０００８】上記流水孔の穿向角度としては、捕捉する
異物が長い程小さい傾斜で済むが、実際上は上記略垂直
に形成される流路に対し、概ね２０〜４０度の範囲で傾
斜することが好適である。As for the grazing angle of the water flow hole, the longer the foreign matter to be captured, the smaller the inclination, but in reality, the inclination angle is in the range of 20 to 40 degrees with respect to the flow path formed substantially vertically. Is preferred.
【０００９】[0009]
【作用】上記本発明の燃料集合体では、流水孔と支持格
子とが形成する経路がくの字状に屈曲することから、こ
の屈曲した経路により前述の如き長尺棒状の異物を詰ま
らせて、これを捕捉することが可能となる。In the above fuel assembly of the present invention, since the path formed by the water flow holes and the support grid is bent in a dogleg shape, the bent path clogs the long rod-shaped foreign matter as described above, It is possible to capture this.
【００１０】[0010]
【実施例】以下、さらに添付図面を参照して、本発明の
実施例を説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１１】図１は本発明実施例燃料集合体の下部ノズ
ル・アダプタプレートを示す部分拡大断面図、図２は同
実施例燃料集合体の概要図、図３は、同、燃料集合体の
下部ノズルと最下部支持格子を示す説明図である。FIG. 1 is a partially enlarged sectional view showing a lower nozzle / adapter plate of a fuel assembly of an embodiment of the present invention, FIG. 2 is a schematic view of the fuel assembly of the embodiment, and FIG. 3 is a lower portion of the fuel assembly. It is explanatory drawing which shows a nozzle and the lowermost support grid.
【００１２】上記本発明実施例の燃料集合体は、図２に
示すように、多数の燃料棒１を並列すると共に、これに
シンブル管２等を混入して、複数の支持格子３で支持せ
しめた燃料棒束部４と、この燃料棒束部４を固定する上
部ノズル５及び下部ノズル６とを具備する構成を有して
いる。そして、図３にも示すように、上記燃料集合体で
は、多数の流水孔７を有する下部ノズル６のアダプタプ
レート８上に、最下部の支持格子３′を近接させて、こ
の支持格子３′の格子板９にて上記流水孔７の出口を十
文字状に細分化している。As shown in FIG. 2, the fuel assembly of the above-described embodiment of the present invention has a large number of fuel rods 1 arranged in parallel, and thimble tubes 2 and the like mixed therein, and supported by a plurality of support grids 3. The fuel rod bundle section 4 is provided with an upper nozzle 5 and a lower nozzle 6 for fixing the fuel rod bundle section 4. Then, as shown in FIG. 3, in the fuel assembly, the lowermost support grid 3'is brought close to the adapter plate 8 of the lower nozzle 6 having a large number of water flow holes 7, and the support grid 3'is provided. The outlet of the water flow hole 7 is subdivided into a cross shape by the grid plate 9 of FIG.
【００１３】一方、本発明実施例では、上記の如き燃料
集合体において、図１に示すように上記流水孔７の穿向
角度７ａを、全て上記格子板９が形成する流路１０の方
向１０ａに対し約３０度の角度で傾斜するよう上記流水
孔７を形成せしめている。この流路の方向１０ａに対す
る流水孔７の穿向角度は、捕捉しようとする異物の長さ
や上記アダプタプレート８の厚さによっても異なってく
るが、上記略垂直に形成される流路１０の流路方向１０
ａに対し、概ね２０〜４０度の範囲で傾斜することが、
後述する長尺棒状の異物を捕捉する上で好適である。On the other hand, in the embodiment of the present invention, in the fuel assembly as described above, as shown in FIG. The water flow hole 7 is formed so as to be inclined at an angle of about 30 degrees. The angle at which the water flow hole 7 is formed with respect to the direction 10a of the flow path varies depending on the length of the foreign matter to be captured and the thickness of the adapter plate 8, but the flow direction of the flow path 10 formed in a substantially vertical direction. Road direction 10
Inclining in the range of about 20 to 40 degrees with respect to a,
It is suitable for capturing a long rod-shaped foreign substance described later.
【００１４】また、アダプタプレート８の一部には、上
記流水孔７以外に小径のものが形成されることもある
が、この小径流水孔（図示せず）の上方には前記格子板
９が必ずしも位置しないため、小径流水孔は、上記流水
孔７のように傾斜して形成しない場合もある。Further, a part of the adapter plate 8 having a small diameter may be formed in addition to the water flow hole 7, and the grid plate 9 is provided above the small diameter water flow hole (not shown). Since it is not always located, the small-diameter water flow hole may not be formed to be inclined like the water flow hole 7 described above.
【００１５】しかして、上記構成を有する本発明実施例
の燃料集合体においては、図１に示す如く長尺棒状の異
物Ｔが下部ノズル６の流水孔７を通過しようとした場合
でも、上記流水孔７と支持格子３とが形成する経路がく
の字状に屈曲することから、図示の如く異物Ｔをこの屈
曲した経路にて詰まらせて、これを捕捉することが可能
である。Therefore, in the fuel assembly of the embodiment of the present invention having the above structure, even when the long rod-shaped foreign matter T tries to pass through the water flow hole 7 of the lower nozzle 6 as shown in FIG. Since the path formed by the hole 7 and the support grid 3 is bent in a dogleg shape, it is possible to catch the foreign material T by clogging the bent path as shown in the figure.
【００１６】以上、本発明の実施例を説明したが、上記
流水孔７は、円孔以外の形状とすることも可能であり、
また、その穿向角度７ａも必ずしも一律に傾斜させる必
要はない。Although the embodiment of the present invention has been described above, the water flow hole 7 may have a shape other than a circular hole,
Further, the pointing angle 7a does not necessarily have to be uniformly inclined.
【００１７】[0017]
【発明の効果】以上説明したように、本発明のＰＷＲ燃
料集合体は、下部ノズル・アダプタプレートの流水孔の
穿向角度を、最下部支持格子の流路方向に対して傾斜せ
しめたものであり、長尺棒状の異物が上記流水孔を通過
しようとした場合でも、この流水孔と支持格子とが形成
する経路がくの字状に屈曲することから、上記異物をこ
の経路で詰まらせて捕捉することができ、これにより燃
料集合体の上記長尺の異物によるトラブルを防止すると
の顕著な効果を奏するものである。As described above, in the PWR fuel assembly of the present invention, the diverging angle of the water flow hole of the lower nozzle / adapter plate is inclined with respect to the flow path direction of the lowermost support grid. Yes, even if a long rod-shaped foreign substance tries to pass through the water flow hole, the route formed by the water flow hole and the support grid is bent in a dogleg shape, so the foreign substance is blocked by this route and captured. Therefore, a remarkable effect of preventing a trouble due to the long foreign matter of the fuel assembly can be obtained.
【図１】本発明実施例燃料集合体の下部ノズル・アダプ
タプレートを示す部分拡大断面図である。FIG. 1 is a partially enlarged sectional view showing a lower nozzle / adapter plate of a fuel assembly according to an embodiment of the present invention.
【図２】同実施例図燃料集合体の概要図である。FIG. 2 is a schematic diagram of a fuel assembly of the same embodiment.
【図３】同、燃料集合体の下部ノズルと最下部支持格子
を示す説明図である。FIG. 3 is an explanatory view showing a lower nozzle and a lowermost support grid of the fuel assembly.
【図４】従来例燃料集合体の下部ノズル・アダプタプレ
ートを示す部分拡大断面図である。FIG. 4 is a partially enlarged cross-sectional view showing a lower nozzle / adapter plate of a conventional fuel assembly.
【図５】下部炉心板流水孔と下部ノズルの位置関係を示
す説明図である。FIG. 5 is an explanatory diagram showing a positional relationship between a lower core plate water flow hole and a lower nozzle.
【図６】従来例の下部ノズルを示す斜視図である。FIG. 6 is a perspective view showing a lower nozzle of a conventional example.
１ 燃料棒２ シンブル管 ３ 支持格子 ４ 燃料棒束部 ５ 上部ノズル ６ 下部ノズル ７ 流水孔 ７ａ 流水孔の穿孔角度 ８ アダプタプレート ９ 格子板 １０ 支持格子の流路 １０ａ 流路の方向 1 Fuel Rod 2 Thimble Tube 3 Support Lattice 4 Fuel Rod Bundle 5 Upper Nozzle 6 Lower Nozzle 7 Water Flow Hole 7a Flow Water Hole Drilling Angle 8 Adapter Plate 9 Lattice Plate 10 Support Lattice Flow Path 10a Flow Direction
Claims (1)
プタプレート上に、最下部の支持格子を近接させ、該支
持格子の格子板にて上記流水孔出口を細分化してなるＰ
ＷＲ燃料集合体において、上記流水孔の穿向角度を、上
記支持格子の流路方向に対して傾斜せしめたことを特徴
とする異物対策型ＰＷＲ燃料集合体。1. A P formed by bringing a lowermost support grid close to an adapter plate of a lower nozzle having a large number of water flow holes, and subdividing the water flow hole outlet by a grid plate of the support grid.
In the WR fuel assembly, a foreign matter countermeasure type PWR fuel assembly, wherein the pouring angle of the water flow hole is inclined with respect to the flow path direction of the support grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5314545A JP2807960B2 (en) | 1993-11-18 | 1993-11-18 | Foreign substance countermeasure type PWR fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5314545A JP2807960B2 (en) | 1993-11-18 | 1993-11-18 | Foreign substance countermeasure type PWR fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07140280A true JPH07140280A (en) | 1995-06-02 |
| JP2807960B2 JP2807960B2 (en) | 1998-10-08 |
Family
ID=18054585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5314545A Expired - Fee Related JP2807960B2 (en) | 1993-11-18 | 1993-11-18 | Foreign substance countermeasure type PWR fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2807960B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935362A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of bottom device of fuel assembly and its bottom nozzle and fuel assembly |
-
1993
- 1993-11-18 JP JP5314545A patent/JP2807960B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935362A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of bottom device of fuel assembly and its bottom nozzle and fuel assembly |
| CN109935362B (en) * | 2017-12-19 | 2024-05-14 | 中国原子能科学研究院 | Fuel assembly, lower tube seat thereof and bottom device of fuel assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2807960B2 (en) | 1998-10-08 |
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