JPH0650356B2 - Control rod drive - Google Patents
Control rod driveInfo
- Publication number
- JPH0650356B2 JPH0650356B2 JP60153868A JP15386885A JPH0650356B2 JP H0650356 B2 JPH0650356 B2 JP H0650356B2 JP 60153868 A JP60153868 A JP 60153868A JP 15386885 A JP15386885 A JP 15386885A JP H0650356 B2 JPH0650356 B2 JP H0650356B2
- Authority
- JP
- Japan
- Prior art keywords
- drive shaft
- guide tube
- control rod
- bellows
- protective cylinder
- 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
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
- Vehicle Body Suspensions (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Valve Device For Special Equipments (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、液体金属冷却型原子炉における高速増殖炉の
制御棒駆動装置に関し、特に緊急事態の発生によっても
該装置の駆動軸案内部に液体金属が侵入することなく、
駆動軸の動きに支障を来たすことのない制御棒駆動装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rod drive device for a fast breeder reactor in a liquid metal cooled nuclear reactor, and particularly to a drive shaft guide portion of the device even when an emergency occurs. Without the ingress of liquid metal,
The present invention relates to a control rod drive device that does not hinder the movement of a drive shaft.
（従来の技術） 従来から高速増殖炉に使用されている制御棒駆動機構
は、第３図に示されているように、高温ナトリウム１０
中にある制御棒２を上下に駆動する機能を有している。
図中、制御棒２の上端部は、駆動軸１によって掴まれて
おり、この駆動軸１は、ハウジング筒６に取りつけられ
ている図示しない上下駆動装置に繋がっている。そし
て、この上下駆動装置を駆動することにより、駆動軸１
及びこれに繋がる制御棒２が共に上下動し、炉の出力を
調整する。また、前記上下駆動装置は、緊急に炉を停止
するために制御棒を急速に下降させる機能をも有してい
るものである。(Prior Art) A control rod drive mechanism that has been conventionally used in a fast breeder reactor is, as shown in FIG.
It has a function of vertically driving the control rod 2 therein.
In the figure, the upper end of the control rod 2 is gripped by a drive shaft 1, and this drive shaft 1 is connected to a vertical drive device (not shown) mounted on a housing cylinder 6. The drive shaft 1 is driven by driving the vertical drive device.
And the control rod 2 connected to this moves up and down together to adjust the output of the furnace. The vertical drive device also has a function of rapidly lowering the control rod in order to stop the furnace urgently.
図中、床面７以下は高温・高放射線の雰囲気にあり、前
記床面７を貫通している制御棒駆動装置によって、床面
７の上下のバウンダリがくずれないようにする必要があ
る。In the figure, the floor surface 7 and below are in an atmosphere of high temperature and high radiation, and it is necessary to prevent the upper and lower boundaries of the floor surface 7 from collapsing by the control rod drive device penetrating the floor surface 7.
そのため、従来の制御棒駆動装置は管台５に密嵌する案
内管３を設け、該案内管３上端の前記駆動軸１摺動面に
Ｏリング１２を介在させてシール部が形成されている。
また、該案内管３の中央部内壁には駆動軸１のガイド面
が形成されており、案内管３の下端にはベローズ４が連
設される。Therefore, the conventional control rod drive device is provided with the guide tube 3 that is tightly fitted to the nozzle base 5, and the seal portion is formed on the sliding surface of the drive shaft 1 at the upper end of the guide tube 3 with the O-ring 12 interposed. .
A guide surface of the drive shaft 1 is formed on the inner wall of the central portion of the guide tube 3, and a bellows 4 is connected to the lower end of the guide tube 3.
前記管台５は下端が床面に密嵌され、その上部にハウジ
ング６が、下端に導入筒９が夫々連設されており、管台
５の側壁及び前記案内管３には外部と案内管３の内部と
連通する孔が穿設されて、該孔は外部のホース８と接続
される。A lower end of the nozzle base 5 is tightly fitted to the floor surface, a housing 6 is connected to the upper part of the nozzle base 5, and an introducing cylinder 9 is connected to the lower end of the nozzle base 5, and the side wall of the nozzle base 5 and the guide pipe 3 are connected to the outside and the guide pipe. A hole communicating with the inside of 3 is provided, and the hole is connected to an external hose 8.
前記導入筒９の上部壁面にはカバーガス１１を通すため
の孔が形成されている。A hole for passing the cover gas 11 is formed on the upper wall surface of the introducing cylinder 9.
このような構成において、床面７下のカバーガス１１は
導入筒９の上部に形成された孔を通過するために、カバ
ーガス１１圧は導入筒９の内外で等しくなり、ナトリウ
ム１０も導入筒９内外で同レベルを維持する。In such a configuration, since the cover gas 11 under the floor surface 7 passes through the hole formed in the upper part of the introduction tube 9, the pressure of the cover gas 11 becomes equal inside and outside the introduction tube 9, and the sodium 10 also enters the introduction tube 9. Maintain the same level inside and outside 9.
このとき、ベローズ４はナトリウム１０中に浸されるこ
とになる。At this time, the bellows 4 will be immersed in the sodium 10.
ベローズ４内には、図示しないガス系ユニットからホー
ス８を経て背圧ガスが送られ、ベローズ４内の背圧がカ
バーガス１１圧より僅かに高めに設定される。Back pressure gas is sent into the bellows 4 from a gas system unit (not shown) via the hose 8, and the back pressure in the bellows 4 is set to be slightly higher than the pressure of the cover gas 11.
これは、万一、ベローズ４が破損した場合にもベローズ
４内にナトリウムを侵入させないためである。This is to prevent sodium from entering the bellows 4 even if the bellows 4 is damaged.
ところで、上記従来の制御棒駆動機構はベローズ４が破
損した場合にもベローズ背圧がカバーガス圧より高いこ
とにより、ナトリウム１０のベローズ４内侵入を防ぐ事
を可能としているが、何らかの原因によりベローズ背圧
が低下したり、若しくはカバーガス１１が異常高圧とな
った場合には、カバーガス１１の圧力がベローズ背圧よ
り高なってナトリウム１０はベローズ４内に侵入するこ
とになる。By the way, in the conventional control rod drive mechanism, even when the bellows 4 is broken, the back pressure of the bellows is higher than the cover gas pressure, so that it is possible to prevent the sodium 10 from entering the bellows 4. When the back pressure decreases or the cover gas 11 becomes an abnormally high pressure, the pressure of the cover gas 11 becomes higher than the back pressure of the bellows, and the sodium 10 enters the bellows 4.
このナトリウム１０が、案内管３の駆動軸ガイド面まで
上昇した場合、駆動軸１と案内管３の間にナトリウム１
０が固着し、駆動軸１が動かなくなる危険性があった。
これは緊急時に駆動軸１を急速下降させるという機能ま
でをも妨げることになり、その解決が強く要望されると
ころであった。When the sodium 10 rises to the drive shaft guide surface of the guide tube 3, the sodium 1
There was a risk that 0 would stick and drive shaft 1 would not move.
This hinders even the function of rapidly lowering the drive shaft 1 in an emergency, and there has been a strong demand for its solution.
（発明が解決しようとする問題点） このように、従来の制御棒駆動装置にあっては、単にベ
ローズのみが破損した場合には、ベローズ内の背圧をカ
バーガス圧より高く設定することによってベローズ内に
ナトリウムが侵入することを妨げて、案内管までナトリ
ウムが入ることは少ないが、たとえばベローズ背圧が低
下したり或はカバーガス圧が異常に高くなったりした場
合には、案内管へのナトリウムの侵入を防ぎ切れず、そ
のため制御棒の上下駆動が困難になる等の問題点を有す
るものであった。(Problems to be Solved by the Invention) As described above, in the conventional control rod drive device, when only the bellows is broken, the back pressure in the bellows is set higher than the cover gas pressure. Sodium is less likely to enter the guide tube by preventing sodium from entering the bellows.However, if the back pressure of the bellows drops or the cover gas pressure becomes abnormally high, enter the guide tube. However, there is a problem in that it is difficult to prevent the sodium from invading and thus it is difficult to vertically drive the control rod.
本発明は、これらの問題点を解決するためになされたも
ので、たとえガス圧に急激な変動があっても駆動軸と保
護筒との間に密閉空間内にはナトリウムが侵入せず、制
御棒の駆動に支障を来たさない制御棒駆動装置を提供し
ようとするものである。The present invention has been made to solve these problems. Even if there is a sudden change in gas pressure, sodium does not enter the sealed space between the drive shaft and the protective cylinder, and control is performed. An object of the present invention is to provide a control rod drive device that does not hinder the drive of the rod.
（問題点を解決するための手段） このため本発明は、制御棒駆動軸の上部及び駆動源を取
り囲むハウジングの下部にシール部を介して管台を取付
け、同管台の内周面に案内管の上部外面を密嵌すると共
に、同案内管の上部内周面によりシール部を介して駆動
軸を摺動可能に支持し、かつ同案内管を下方に延設して
その下端にベローズの上部を固定し、同ベローズの下端
は駆動軸に封着してなる液体金属冷却型原子炉の原子炉
容器の上部に設置される制御棒駆動装置において、前記
案内管と駆動軸との間に保護筒を介設し、同保護筒は下
端内径が小径に形成されて駆動軸のガイド部を形成する
と共に、同案内管の上部内壁によって支持されており、
かつ同保護筒の上部外面と案内管の上部内面との間にシ
ール部を形成して同保護筒内に密閉空間を形成してなる
もので、これを問題点解決のための手段とするものであ
る。(Means for Solving the Problems) Therefore, according to the present invention, the nozzle is attached to the upper part of the control rod drive shaft and the lower part of the housing surrounding the drive source via the seal part, and the guide is guided to the inner peripheral surface of the nozzle. The outer surface of the upper part of the pipe is tightly fitted, and the drive shaft is slidably supported by the inner peripheral surface of the upper part of the guide pipe through the seal portion, and the guide pipe is extended downward and the bellows is attached to the lower end thereof. In a control rod drive device installed at the upper part of the reactor vessel of a liquid metal cooled reactor in which the upper part is fixed and the lower end of the bellows is sealed to the drive shaft, between the guide tube and the drive shaft. A protective cylinder is provided, and the inner diameter of the lower end of the protective cylinder is formed to be small to form the guide portion of the drive shaft, and the protective cylinder is supported by the upper inner wall of the guide tube.
In addition, a seal portion is formed between the upper outer surface of the protective cylinder and the upper inner surface of the guide tube to form a sealed space in the protective cylinder, which is used as a means for solving the problem. Is.
（作用） もしベローズが破損しベローズ背圧ガス圧がカバーガス
圧より低くなったとしても、案内管と保護筒及び駆動軸
の三者により形成された密閉空間内に閉じ込められたガ
スによる圧力によってナトリウムを前記密閉空間内に侵
入させることをなくす。従って、駆動軸が案内管ガイド
面に固着することも防止することになる。(Function) Even if the bellows is damaged and the backpressure gas pressure of the bellows becomes lower than the cover gas pressure, due to the pressure of the gas trapped in the closed space formed by the guide tube, the protective cylinder and the drive shaft, Prevent sodium from penetrating into the enclosed space. Therefore, it is possible to prevent the drive shaft from sticking to the guide tube guide surface.
（実施例） 本発明の実施例を図面に基づいて説明する。第１図は本
実施例である制御棒駆動装置を示し、図中案内管３の上
部内周面によりＯリング１２を介しして駆動軸１を摺動
可能に支持すると共に、中空円筒状の保護筒２０を案内
管３と駆動軸１との間に設ける。この保護筒２０は下端
内径が小さく形成され駆動軸１を事実上ガイドするもの
で、案内管３の上部内壁によって支持され、この支持部
である保護筒２０と案内管３の間にはＯリング２１が介
在されてこの部分を気体が通過しないようにされてい
る。(Example) The Example of this invention is described based on drawing. FIG. 1 shows a control rod drive device according to the present embodiment, in which the drive shaft 1 is slidably supported by an upper inner peripheral surface of a guide tube 3 via an O-ring 12 and has a hollow cylindrical shape. The protective cylinder 20 is provided between the guide tube 3 and the drive shaft 1. The protective cylinder 20 is formed to have a small inner diameter at the lower end to effectively guide the drive shaft 1. The protective cylinder 20 is supported by the inner wall of the upper portion of the guide tube 3. 21 is interposed so that gas does not pass through this portion.
従って、保護筒２０の内部は、案内管３と駆動軸１間の
Ｏリング１２、案内管３と保護筒２０間のＯリング２１
及び保護筒２０の下端によって囲まれた密閉空間を形成
する。Therefore, inside the protective cylinder 20, an O-ring 12 between the guide tube 3 and the drive shaft 1 and an O-ring 21 between the guide tube 3 and the protective cylinder 20 are provided.
And a closed space surrounded by the lower end of the protective cylinder 20 is formed.
第２図は、以上の構成からなる制御棒駆動装置にあっ
て、万一ベローズ４が破損し、上部案内管３内の液位が
上昇した場合を示すものである。ベローズ背圧ガス圧が
カバーガス圧よりも下がりナトリウム液位が保護筒２０
を侵すＡの位置まで達した時点でも上記した密閉空間内
のガス圧は低下することがないので、駆動軸１と保護筒
２０の間のナトリウム液位は保護筒２０の下端部にあた
るＢの高さより殆ど上昇することはない。FIG. 2 shows the case where the bellows 4 is broken and the liquid level in the upper guide tube 3 rises in the control rod drive device having the above configuration. Bellows back pressure Gas pressure is lower than cover gas pressure and sodium level is protective cylinder 20
Since the gas pressure in the closed space does not drop even when the position A which invades the protection cylinder 20 is reached, the sodium liquid level between the drive shaft 1 and the protection cylinder 20 is higher than that of B which is the lower end of the protection cylinder 20. It hardly rises above that level.
（発明の効果） 以上、詳細に説明した如く本発明によると、ベローズが
破損し、万一ベローズ背圧ガス圧が下がろうとも、駆動
軸は保護筒間でナトリウムによる固着を起こすことがな
い。従ってベローズ破損時の駆動軸急速降下の際にも駆
動軸が円滑に動き、速やかに炉を停止した後、ベローズ
の修理を行うことができるものである。(Effects of the Invention) As described in detail above, according to the present invention, even if the bellows is damaged and the backpressure gas pressure of the bellows is lowered, the drive shaft does not stick to the protection cylinders due to sodium. . Therefore, even when the drive shaft rapidly descends when the bellows is damaged, the drive shaft moves smoothly, and the bellows can be repaired immediately after stopping the furnace.
第１図は本発明の実施例を示す正常時の制御棒駆動装置
の断面図、第２図は同装置における案内管内の液位が上
昇した状態を示す断面図、第３図は従来の制御棒駆動装
置の断面図である。 図の主要部分の説明 １……駆動軸 ３……案内管 ４……ベローズ １０……液体ナトリウム １１……カバーガス ２０……保護筒 ２１……ＯリングFIG. 1 is a cross-sectional view of a control rod drive device in a normal state showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which the liquid level in a guide tube in the device is increased, and FIG. 3 is a conventional control. It is sectional drawing of a rod drive device. Description of main parts of the figure 1 …… Drive shaft 3 …… Guide tube 4 …… Bellows 10 …… Liquid sodium 11 …… Cover gas 20 …… Protective cylinder 21 …… O-ring
Claims (1)
ハウジングの下部にシール部を介して管台を取付け、同
管台の内周面に案内管の上部外面を密嵌すると共に、同
案内管の上部内周面によりシール部を介して駆動軸を摺
動可能に支持し、かつ同案内管を下方に延設してその下
端にベローズの上部を固定し、同ベローズの下端は駆動
軸に封着してなる液体金属冷却型原子炉の原子炉容器の
上部に設置される制御棒駆動装置において、前記案内管
と駆動軸との間に保護筒を介設し、同保護筒は下端内径
が小径に形成されて駆動軸のガイド部を形成すると共
に、同案内管の上部内壁によって支持されており、かつ
同保護筒の上部外面と案内管の上部内面との間にシール
部を形成して同保護筒内に密閉空間を形成したことを特
徴とする制御棒駆動装置。1. A nozzle stub is attached to an upper part of a control rod drive shaft and a lower part of a housing surrounding a drive source via a seal portion, and an upper outer surface of a guide pipe is closely fitted to an inner peripheral surface of the nozzle stub. The drive shaft is slidably supported by the inner peripheral surface of the upper part of the guide tube through the seal part, and the guide tube is extended downward to fix the upper part of the bellows to the lower end, and the lower end of the bellows is driven. In a control rod drive device installed in the upper part of a reactor vessel of a liquid metal cooled nuclear reactor sealed to a shaft, a protective cylinder is provided between the guide tube and the drive shaft, and the protective cylinder is The inner diameter of the lower end is formed to be a small diameter to form the guide portion of the drive shaft, and is supported by the inner wall of the upper portion of the guide tube, and the seal portion is provided between the outer surface of the upper portion of the protective cylinder and the inner surface of the upper portion of the guide tube. Control rod drive characterized by forming a sealed space inside the protective cylinder Location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60153868A JPH0650356B2 (en) | 1985-07-12 | 1985-07-12 | Control rod drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60153868A JPH0650356B2 (en) | 1985-07-12 | 1985-07-12 | Control rod drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6214087A JPS6214087A (en) | 1987-01-22 |
| JPH0650356B2 true JPH0650356B2 (en) | 1994-06-29 |
Family
ID=15571859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60153868A Expired - Lifetime JPH0650356B2 (en) | 1985-07-12 | 1985-07-12 | Control rod drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0650356B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3012268B2 (en) * | 1990-02-28 | 2000-02-21 | 黒田精工株式会社 | Manufacturing method of laminated core |
| JPH04105536A (en) * | 1990-08-22 | 1992-04-07 | Kuroda Precision Ind Ltd | Manufacturing method of laminated core |
| US5171962A (en) * | 1990-02-28 | 1992-12-15 | Kuroda Seiko Company Limited | Method of manufacturing laminated core |
| JP2706710B2 (en) * | 1991-05-24 | 1998-01-28 | 黒田精工株式会社 | Manufacturing method of laminated core |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153864A (en) * | 1984-01-25 | 1985-08-13 | 松下電工株式会社 | Sauna |
-
1985
- 1985-07-12 JP JP60153868A patent/JPH0650356B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153864A (en) * | 1984-01-25 | 1985-08-13 | 松下電工株式会社 | Sauna |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6214087A (en) | 1987-01-22 |
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