JP2000056059A - Control rod cluster - Google Patents
Control rod clusterInfo
- Publication number
- JP2000056059A JP2000056059A JP10228310A JP22831098A JP2000056059A JP 2000056059 A JP2000056059 A JP 2000056059A JP 10228310 A JP10228310 A JP 10228310A JP 22831098 A JP22831098 A JP 22831098A JP 2000056059 A JP2000056059 A JP 2000056059A
- Authority
- JP
- Japan
- Prior art keywords
- neutron absorber
- cladding tube
- control rod
- presser spring
- rod cluster
- 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.)
- Withdrawn
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加圧水型原子炉に
使用される制御棒クラスタに関する。The present invention relates to a control rod cluster used in a pressurized water reactor.
【０００２】[0002]
【従来の技術】加圧水型原子炉に使用される制御棒クラ
スタは、図３に示されるように、制御棒駆動装置に切り
離し可能に接続される筒状のスパイダ１１と、このスパ
イダ１１の外周面に放射状に取り付けられた複数のベー
ン１２と、これらベーン１２の先端部に上端部を固定さ
れたロッド状のフィンガ１３とを有しており、各フィン
ガ１３の下端部には被覆管１５が上部端栓１４を介して
保持されている。2. Description of the Related Art As shown in FIG. 3, a control rod cluster used in a pressurized water reactor has a cylindrical spider 11 which is detachably connected to a control rod driving device, and an outer peripheral surface of the spider 11. And a plurality of vanes 12 radially attached to each other, and rod-shaped fingers 13 having upper ends fixed to the ends of these vanes 12. It is held via an end plug 14.
【０００３】被覆管１５はステンレス鋼で形成されてお
り、この被覆管１５内には、図４に示されるように、中
性子吸収体１６が収納されている。この中性子吸収体１
６は円柱状に成形されており、その下端は上部端栓１４
と中性子吸収体１６との間に設けられたコイル状の押え
バネ１７によって被覆管１５の下端を閉塞する下部端栓
に押え付けられている。[0003] The cladding tube 15 is formed of stainless steel, and a neutron absorber 16 is housed in the cladding tube 15 as shown in FIG. This neutron absorber 1
6 is formed in a cylindrical shape, and the lower end thereof is an upper end plug 14.
It is pressed against a lower end plug that closes the lower end of the cladding tube 15 by a coil-shaped pressing spring 17 provided between the cladding tube 15 and the neutron absorber 16.
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
制御棒クラスタは、図５に示されるように、制御棒駆動
装置１８によって原子炉容器１９内の案内管２０に挿入
される。この案内管２０の内部には、図６に示すような
複数のプレート状ガード２１が固設されており、制御棒
クラスタの被覆管１５は上記ガード２１に形成された制
御棒ガイド孔を挿通して原子炉容器１９の炉心内に挿入
される。By the way, such a control rod cluster is inserted into a guide tube 20 in a reactor vessel 19 by a control rod driving device 18 as shown in FIG. A plurality of plate-shaped guards 21 as shown in FIG. 6 are fixed inside the guide tube 20, and the cladding tube 15 of the control rod cluster is inserted through a control rod guide hole formed in the guard 21. Into the reactor core of the reactor vessel 19.
【０００５】従って、上述した制御棒クラスタでは、ガ
ード２１との接触により被覆管１５の摩耗が進行し、被
覆管１５の肉厚が薄くなると、冷却水の圧力によって被
覆管１５が内側に変形することがある。そして、被覆管
１５が内側に変形すると、被覆管１５の内面が中性子吸
収体１６の上端周縁部に接触し、この部分に応力が集中
してクラック等の発生を招く惧れがあった。Accordingly, in the above-described control rod cluster, the cladding tube 15 is worn by the contact with the guard 21, and when the thickness of the cladding tube 15 is reduced, the cladding tube 15 is deformed inward by the pressure of the cooling water. Sometimes. When the cladding tube 15 is deformed inward, the inner surface of the cladding tube 15 comes into contact with the peripheral edge of the upper end of the neutron absorber 16, and stress concentrates on this portion, which may cause cracks or the like.
【０００６】本発明は上記の点に鑑みてなされたもの
で、被覆管の構造健全性を長期に亘って安定に保つこと
のできる制御棒クラスタを提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 points, and has as its object to provide a control rod cluster capable of keeping the structural integrity of a cladding tube stable for a long period of time.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めに、請求項１の発明は、制御棒駆動装置に接続される
筒状のスパイダと、このスパイダの外周面に放射状に取
り付けられた複数のベーンと、これらベーンの先端部に
上端部を固定された複数のロッド状フィンガと、これら
フィンガの下端に上部端栓を介して保持された被覆管
と、この被覆管内に収容された円柱状の中性子吸収体
と、この中性子吸収体と前記上部端栓との間に設けられ
たコイル状の押えバネとを備えた制御棒クラスタにおい
て、前記中性子吸収体の上端周縁部を前記押えバネの外
周面より内側に配置したことを特徴とする。請求項２の
発明は、請求項１記載の制御棒クラスタにおいて、前記
中性子吸収体の上端周縁部が前記中性子吸収体の上端部
を円錐状に形成して前記押えバネの外周面より内側に配
置されていることを特徴とする。In order to solve the above-mentioned problems, a first aspect of the present invention provides a cylindrical spider connected to a control rod driving device and radially mounted on an outer peripheral surface of the spider. A plurality of vanes, a plurality of rod-shaped fingers having upper ends fixed to the tips of the vanes, a cladding tube held at the lower ends of these fingers via an upper end plug, and a circle accommodated in the cladding tube In a control rod cluster including a columnar neutron absorber and a coil-shaped presser spring provided between the neutron absorber and the upper end plug, an upper end peripheral portion of the neutron absorber is formed by the presser spring. It is characterized by being arranged inside the outer peripheral surface. According to a second aspect of the present invention, in the control rod cluster according to the first aspect, the upper end peripheral portion of the neutron absorber forms the upper end portion of the neutron absorber in a conical shape and is disposed inside the outer peripheral surface of the presser spring. It is characterized by having been done.
【０００８】[0008]
【発明の実施の形態】以下、図面を参照して本発明の一
実施形態について説明するが、その概略構成は図３に示
したものと同様の構成であるので、ここでは本発明の要
部となる部分について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The schematic configuration is the same as that shown in FIG. Will be described.
【０００９】図１には本発明の一実施形態における被覆
管１５内の上部構造が示されており、被覆管１５はステ
ンレス鋼で形成されている。この被覆管１５内に収納さ
れた中性子吸収体１６は円柱状に成形されており、その
下端は上部端栓１４と中性子吸収体１６との間に設けら
れたコイル状の押えバネ１７によって被覆管１５の下端
を閉塞する下部端栓に押え付けられている。FIG. 1 shows an upper structure in a cladding tube 15 according to an embodiment of the present invention. The cladding tube 15 is formed of stainless steel. The neutron absorber 16 housed in the cladding tube 15 is formed in a cylindrical shape, and the lower end thereof is covered by a coil-shaped pressing spring 17 provided between the upper end plug 14 and the neutron absorber 16. 15 is pressed against a lower end plug closing the lower end.
【００１０】中性子吸収体１６の上端部は上部端栓１４
に向かって円錐状に形成されており、これにより図２に
示されるように、中性子吸収体１６の上端周縁部１６ａ
が押えバネ１７の外周面１７ａより内側に配置されてい
る。The upper end of the neutron absorber 16 is connected to the upper end plug 14.
, And as shown in FIG. 2, the upper end peripheral portion 16a of the neutron absorber 16 is formed as shown in FIG.
Are disposed inside the outer peripheral surface 17a of the presser spring 17.
【００１１】このように中性子吸収体１６の上端周縁部
１６ａを押えバネ１７の外周面１７ａより内側に配置す
ることにより、被覆管１５が内側に変形しても被覆管１
５の内面が中性子吸収体１６の上端周縁部１６ａに接触
することがない。従って、被覆管１５が内側に変形して
も被覆管１５の内面に応力が集中することがないため、
クラック等の発生を防止でき、被覆管１５の構造健全性
を長期に亘って安定に保つことができる。By arranging the upper peripheral portion 16a of the neutron absorber 16 inside the outer peripheral surface 17a of the presser spring 17 as described above, even if the cladding tube 15 is deformed inward,
5 does not come into contact with the upper edge 16a of the neutron absorber 16. Therefore, even if the cladding tube 15 is deformed inward, stress does not concentrate on the inner surface of the cladding tube 15,
The generation of cracks and the like can be prevented, and the structural integrity of the cladding tube 15 can be stably maintained for a long period of time.
【００１２】なお、上述した実施形態では中性子吸収体
１６の上端部を円錐状に形成して中性子吸収体１６の上
端周縁部１６ａを押えバネ１７の外周面１７ａより内側
に配置したが、本発明は上述した実施形態に限定される
ものではない。In the above-described embodiment, the upper end of the neutron absorber 16 is formed in a conical shape and the upper peripheral edge 16a of the neutron absorber 16 is disposed inside the outer peripheral surface 17a of the pressing spring 17. Is not limited to the embodiment described above.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
被覆管の構造健全性を長期に亘って安定に保つことので
きる制御棒クラスタを提供できる。As described above, according to the present invention,
It is possible to provide a control rod cluster that can keep the structural integrity of the cladding tube stable over a long period of time.
【図１】本発明の一実施形態における被覆管内の上部構
造を示す断面図である。FIG. 1 is a sectional view showing an upper structure in a cladding tube according to an embodiment of the present invention.
【図２】図１のＡ−Ａ線に沿う断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】制御棒クラスタの斜視図である。FIG. 3 is a perspective view of a control rod cluster.
【図４】従来の制御棒クラスタにおける被覆管内の上部
構造を示す断面図である。FIG. 4 is a cross-sectional view showing an upper structure in a cladding tube in a conventional control rod cluster.
【図５】制御棒クラスタが使用される原子炉内の内部構
造を示す図である。FIG. 5 is a diagram showing an internal structure in a nuclear reactor in which a control rod cluster is used.
【図６】図５のＢ部における構造を示す断面図である。FIG. 6 is a cross-sectional view showing a structure at a portion B in FIG. 5;
１１ スパイダ １２ ベーン １３ フィンガ １４ 上部端栓 １５ 被覆管 １６ 中性子吸収
体 １７ 押えバネDESCRIPTION OF SYMBOLS 11 Spider 12 Vane 13 Finger 14 Upper end plug 15 Clad tube 16 Neutron absorber 17 Presser spring
Claims (2)
イダと、このスパイダの外周面に放射状に取り付けられ
た複数のベーンと、これらベーンの先端部に上端部を固
定された複数のロッド状フィンガと、これらフィンガの
下端に上部端栓を介して保持された被覆管と、この被覆
管内に収容された円柱状の中性子吸収体と、この中性子
吸収体と前記上部端栓との間に設けられたコイル状の押
えバネとを備えた制御棒クラスタにおいて、 前記中性子吸収体の上端周縁部を前記押えバネの外周面
より内側に配置したことを特徴とする制御棒クラスタ。1. A cylindrical spider connected to a control rod driving device, a plurality of vanes radially attached to an outer peripheral surface of the spider, and a plurality of rods having upper ends fixed to tips of the vanes. Shaped fingers, a cladding tube held at the lower ends of these fingers via an upper end plug, a columnar neutron absorber accommodated in the cladding tube, and a space between the neutron absorber and the upper end plug. A control rod cluster including a coil-shaped presser spring provided, wherein a peripheral edge of an upper end of the neutron absorber is disposed inside an outer peripheral surface of the presser spring.
中性子吸収体の上端部を円錐状に形成して前記押えバネ
の外周面より内側に配置されていることを特徴とする請
求項１記載の制御棒クラスタ。2. The neutron absorber according to claim 1, wherein an upper edge portion of the neutron absorber is formed inside the outer peripheral surface of the presser spring by forming an upper end portion of the neutron absorber into a conical shape. Control rod cluster as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228310A JP2000056059A (en) | 1998-08-12 | 1998-08-12 | Control rod cluster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228310A JP2000056059A (en) | 1998-08-12 | 1998-08-12 | Control rod cluster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000056059A true JP2000056059A (en) | 2000-02-25 |
Family
ID=16874446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10228310A Withdrawn JP2000056059A (en) | 1998-08-12 | 1998-08-12 | Control rod cluster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000056059A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985420A (en) * | 2014-06-05 | 2014-08-13 | 西南科技大学 | Control rod capable of flattening axial power distribution of reactor core and control rod assembly |
-
1998
- 1998-08-12 JP JP10228310A patent/JP2000056059A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985420A (en) * | 2014-06-05 | 2014-08-13 | 西南科技大学 | Control rod capable of flattening axial power distribution of reactor core and control rod assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR920003463B1 (en) | Lower end fitting debris collector and end cap spacer grid | |
| JPH0210295A (en) | Spring structure in support grid for nuclear fuel rod | |
| EP0433620A1 (en) | Reduced flow resistance cast lower end fitting | |
| JPH02287290A (en) | Lower end nozzle of fuel assembly with particle holder and fuel assembly with the same end nozzle | |
| US4522782A (en) | Fuel assembly for a nuclear reactor | |
| JP2000056059A (en) | Control rod cluster | |
| KR102268275B1 (en) | A bottom Fixture of Nuclear Fuel Assembly formed flow hole by a Aircraft Airfoil Structure forming a flow hole | |
| JP5525941B2 (en) | Reel seat and fishing rod | |
| US6226343B1 (en) | Water rod in a fuel assembly of a boiling water nuclear reactor | |
| EP0169421B1 (en) | Control rod for a nuclear reactor | |
| JP2001190185A (en) | Top of fishing rod | |
| US6272197B1 (en) | Coolant mixing grid for nuclear fuel assembly | |
| JPS5983114A (en) | Holder for plastic lens | |
| JPH10232289A (en) | Control rod for nuclear reactor | |
| RU2006137687A (en) | FUEL ASSEMBLY OF A CHANNEL NUCLEAR REACTOR | |
| US2878064A (en) | Liquid fuel injection nozzles for internal combustion engines | |
| JP2003248078A (en) | Fuel assembly for nuclear reactor | |
| RU2189644C2 (en) | Nuclear reactor fuel assembly | |
| JPH05150064A (en) | Fuel assembly | |
| JPH0488262A (en) | Cylinder tube of fluid pressure cylinder | |
| JPH11160476A (en) | Reactor fuel assembly | |
| JPH027258Y2 (en) | ||
| JP2000171581A (en) | Control rod and control rod cluster for reactor | |
| JPH0727047B2 (en) | Control rod for pressurized water reactor | |
| KR920000495B1 (en) | Element immersed in coolant of nuclear reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20051101 |