JPH0727048B2 - Electric control rod drive mechanism for nuclear power plant - Google Patents
Electric control rod drive mechanism for nuclear power plantInfo
- Publication number
- JPH0727048B2 JPH0727048B2 JP60272415A JP27241585A JPH0727048B2 JP H0727048 B2 JPH0727048 B2 JP H0727048B2 JP 60272415 A JP60272415 A JP 60272415A JP 27241585 A JP27241585 A JP 27241585A JP H0727048 B2 JPH0727048 B2 JP H0727048B2
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- roller
- pin
- drive mechanism
- rod drive
- 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
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は、制御棒の挿入・引抜きが円滑に出来かつ長期
間の使用が可能な原子力発電プラント用電動制御棒駆動
機構に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an electric control rod drive mechanism for a nuclear power plant capable of smoothly inserting and withdrawing a control rod and capable of being used for a long period of time.
従来、原子力発電プラントに使用されている制御棒駆動
機構は第１図に示すように、原子炉容器１の外側に突設
した筒体２の内側に制御棒３を支持する支持筒４挿着
し、炉水と制御棒駆動水とを遮断するシールリング5,6
を設けて、制御棒駆動水の供給により制御棒３を上下さ
せる構造であった。Conventionally, a control rod drive mechanism used in a nuclear power plant is, as shown in FIG. 1, inserted into a support cylinder 4 for supporting a control rod 3 inside a cylindrical body 2 protruding from the outside of a reactor vessel 1. Seal ring 5, 6 that shuts off the reactor water and control rod drive water
And the control rod 3 is moved up and down by supplying control rod driving water.
しかし、最近燃料の有効利用および高精度の燃焼制御の
観点から、第２図に示すような原子炉容器11の外側に突
設した筒体12の内側に制御棒13を支持する中空ピストン
14を挿着し、ボールネジ軸15を介して電動機16により制
御棒13を上下さす構造の電動制御棒駆動機構が開発され
始めている。However, recently, from the viewpoint of effective use of fuel and highly accurate combustion control, a hollow piston that supports a control rod 13 inside a cylindrical body 12 that projects from the outside of a reactor vessel 11 as shown in FIG.
An electric control rod drive mechanism having a structure in which 14 is inserted and the control rod 13 is moved up and down by a motor 16 via a ball screw shaft 15 has begun to be developed.
ところで、この電動制御棒駆動機構には、中空ピストン
14を長期間円滑に作動させるため、いいかえれば制御棒
13を長期間円滑に、かつ精度よく作動出来るように案内
用のピン／ローラ17〜25が装置されている。By the way, this electric control rod drive mechanism has a hollow piston.
In other words, in order to operate 14 smoothly for a long time, in other words, control rod
Pins / rollers 17 to 25 for guiding are provided so that the 13 can be operated smoothly and accurately for a long period of time.
このピン／ローラは第３図に一例を示したように、ピン
31はピン固定部32に回り止めを有して固定され、ローラ
33はピン31を軸として回転する構造となっている。This pin / roller has a pin, as shown in FIG.
31 is fixed to the pin fixing portion 32 with a detent,
33 has a structure that rotates about the pin 31.
この場合、ピン31の外周部はローラ33の内周部と摺動摩
擦を、またローラ外周部は第２図の中空ピストン14の外
周部や案内管17、その他ところがり摩擦を生じ摩耗す
る。In this case, the outer peripheral portion of the pin 31 causes sliding friction with the inner peripheral portion of the roller 33, and the outer peripheral portion of the roller causes abrasion due to the outer peripheral portion of the hollow piston 14 shown in FIG.
このピン／ローラの場合のような耐摩耗性を必要とする
機械部品には、一般にコバルトを約50％含む通称ステラ
イトと呼ばれる合金が使用される。Alloys commonly referred to as stellite containing approximately 50% cobalt are used for machine parts that require wear resistance, such as in the case of pins / rollers.
しかしながら、コバルト基合金で構成されたピン／ロー
ラを原子力発電プラント用電動制御棒駆動機構に使用す
ると、摩擦による摩耗生成物や腐食生成物などがコバル
トを含むため、これが電動制御棒駆動機構の冷却水によ
って原子炉中にもちきたされ、中性子の照射によりコバ
ルト60となり、原子力発電プラントの放射線線量率を上
昇させることになる。さらにこのコバルト60が蓄積する
と、原子力発電プラントの定期検査時における作業従事
者の放射線被爆量を増加させる虞れがあり、ひいてはプ
ラントの稼動率を低下させることにもなる。また一般の
金属材料を適用した場合には摩耗が著しく大きく、制御
棒の駆動が円滑に長期間使用出来ない。さらに、このよ
うな形の場合ピンの外径とローラ内径寸法精度や仕上げ
精度がむづかしく、加工に時間がかかるなど不利であ
る。However, when a pin / roller made of a cobalt-based alloy is used in an electric control rod drive mechanism for a nuclear power plant, wear products and corrosion products due to friction contain cobalt, which results in cooling of the electric control rod drive mechanism. It is brought into the reactor by water and becomes a cobalt-60 by neutron irradiation, which will increase the radiation dose rate of the nuclear power plant. Further, the accumulation of this cobalt 60 may increase the radiation exposure of workers during the periodic inspection of the nuclear power plant, which in turn lowers the operating rate of the plant. Further, when a general metal material is applied, the wear is extremely large, and the control rod cannot be smoothly driven for a long period of time. Further, in the case of such a shape, the pin outer diameter and the roller inner diameter dimensional accuracy and finishing accuracy are difficult, which is disadvantageous in that processing takes time.
本発明はかかる点に鑑みてなされたもので、制御棒の挿
入、引抜きが円滑に出来、かつ長期間の使用が可能であ
るばかりでなく、コバルト60による放射線線量率の上昇
を抑制してプラントの稼動率向上を図った原子力発電プ
ラント用電動制御棒駆動機構を提供することを目的とし
たものである。The present invention has been made in view of the above point, not only can the control rod be smoothly inserted and withdrawn, and can be used for a long period of time, as well as suppressing the increase of the radiation dose rate due to cobalt 60 in the plant. It is an object of the present invention to provide an electric control rod drive mechanism for a nuclear power plant in which the operating rate is improved.
本発明は、原子炉容器の外側に突設した筒体の内側に制
御棒を支持する中空ピストンを装着し、ボールネジ軸を
介して電動機により制御棒を上下さす構造の原子力発電
プラント用電動制御棒駆動機構であって、電動制御棒駆
動機構が、ピン取り付け部に回り止めを有して固定され
たピン及びピンを軸として回転するローラからなるピン
／ローラの組み合わせを有しており、ピン／ローラの組
み合わせにおけるローラがベアリングであり、ベアリン
グにはボールあるいはローラの脱落を防止するカバーが
ベアリングの内輪または外輪に接続されていることを特
徴とする原子力発電プラント用電動制御棒駆動機構であ
る。The present invention is an electric control rod for a nuclear power plant having a structure in which a hollow piston that supports a control rod is mounted inside a cylindrical body that projects from the outside of a reactor vessel, and the control rod is moved up and down by an electric motor via a ball screw shaft. In the drive mechanism, the electric control rod drive mechanism has a pin / roller combination including a pin fixed with a detent in the pin mounting portion and a roller that rotates about the pin. In the electric control rod drive mechanism for a nuclear power plant, the roller in the combination of rollers is a bearing, and the bearing is connected with a cover for preventing the balls or the rollers from coming off from the inner ring or the outer ring of the bearing.
本発明においては、ピン／ローラの組み合わせにおい
て、第４図、第５図に示したようにローラ51であるベア
リングのボールあるいはローラの脱落を防止するカバー
52がベアリングの外輪または内輪に接続されたベアリン
グであることを特徴とする制御棒駆動機構である。According to the present invention, in the pin / roller combination, as shown in FIGS. 4 and 5, a cover for preventing the ball of the bearing, which is the roller 51, or the falling of the roller.
A control rod drive mechanism is characterized in that 52 is a bearing connected to the outer ring or the inner ring of the bearing.
ここで、本発明に係る電動制御棒駆動機構の限定理由に
ついて説明すると、ローラをベアリングにした理由はロ
ーラが第３図のように一体構造である場合には、ピンと
ローラの内面が摺動摩擦して摩耗を生じ、ローラが滑ら
かに回転しにくくなり制御棒の高精度な作動がしにくく
なり、長期の使用が出来ない。また、摩耗が著しい場合
には、ローラ内面とピンが焼付を生じローラが回転しな
くなり、それによりローラ外周と中空ピストン外周部や
案内管内周部の摩擦がころがり摩擦から摺動摩擦とな
り、摩擦係数が大幅に上昇して電動機に大きなトルクが
かかるとともに制御棒の挿入，引抜きが困難になる。Here, the reason for limiting the electric control rod drive mechanism according to the present invention will be explained. The reason why the roller is used as a bearing is that when the roller has an integral structure as shown in FIG. 3, sliding friction occurs between the pin and the inner surface of the roller. As a result, abrasion is generated, the roller does not rotate smoothly, and it becomes difficult to operate the control rod with high precision, so it cannot be used for a long time. Also, if the wear is significant, the inner surface of the roller and the pin will be seized, and the roller will not rotate, which causes the friction between the outer circumference of the roller and the outer circumference of the hollow piston or the inner circumference of the guide tube to change from rolling friction to sliding friction, resulting in a friction coefficient It rises significantly and a large torque is applied to the motor, and it becomes difficult to insert and pull out the control rod.
しかし、本発明に係るようにローラをベアリングとした
場合にはベアリングの外輪が中空ピストンところがり摩
擦をし、またベアリング外輪内面および内輪外面とがベ
アリングのボールあるいはローラところがり摩擦をし、
ベアリングの内輪内面とピンとは摺動摩擦をするが、こ
ろがり摩擦係数の方が摺動摩擦係数より遥かに小さいこ
とからピンとベアリング内輪とはほとんど摺動摩耗をし
ない。そのため、長期間使用してもローラの回転は滑ら
かで、制御棒の高精度の作動が可能となる。なお、ピン
外径とローラ内径の寸法精度や仕上げ精度は従来の形の
ものほど必要がなく、加工が容易である。However, when a roller is used as a bearing according to the present invention, the outer ring of the bearing has a hollow piston sliding friction, and the bearing outer ring inner surface and the inner ring outer surface have a bearing ball or roller sliding friction,
Sliding friction occurs between the inner ring inner surface of the bearing and the pin. However, since the rolling friction coefficient is much smaller than the sliding friction coefficient, the pin and the bearing inner ring hardly slide and wear. Therefore, even if the roller is used for a long period of time, the rotation of the roller is smooth and the control rod can be operated with high accuracy. Note that the dimensional accuracy of the pin outer diameter and the roller inner diameter and the finishing accuracy are not required as in the conventional form, and the processing is easy.
また、ボールあるいはローラの脱落の防止するカバーを
ベアリングの内輪あるいは外輪につける理由はローラで
あるベアリングにねじり応力が作用したとしても、ベア
リングのボールあるいはローラが飛び出さないよう、安
全性を高めるためである。Also, the reason why the cover that prevents the balls or rollers from falling off is to be attached to the inner ring or outer ring of the bearing is to improve the safety so that the balls or rollers of the bearing do not jump out even if torsional stress acts on the bearing that is the roller. Is.
なお、ピンの取付部とローラであるベアリングとが第６
図に示したようにスキマがある場合、ローラであるベア
リングかピンの軸方向に移動する場合があるが、この時
には第６図のようにスペーサ61を入れればよく、またこ
のスペーサの外径を大きくしてベアリングのボールある
いはローラの脱落防止としても良い。The pin mounting portion and the roller bearing are the sixth
If there is a gap as shown in the figure, it may move in the axial direction of the bearing or the pin that is a roller. At this time, the spacer 61 may be inserted as shown in Fig. 6, and the outer diameter of this spacer may be changed. It may be enlarged to prevent the balls or rollers of the bearing from falling off.
以上説明したように、本発明に係る原子力発電プラント
用電動制御棒駆動機構によれば、原子炉の起動停止や出
力の上昇下降に伴なう、ピン／ローラの摩擦抵抗や摩擦
損耗が小さく出来、長期間安定して制御棒の駆動を高精
度に行うことが出来、ひいてはプラントの稼動率の向上
を図れるなど顕著な効果を表わすものである。As described above, according to the electric control rod drive mechanism for a nuclear power plant according to the present invention, it is possible to reduce the frictional resistance and frictional wear of the pin / roller that accompanies the start / stop of the reactor and the rise / fall of the output. In addition, the control rod can be driven with high accuracy in a stable manner for a long period of time, and the plant operating rate can be improved, which is a remarkable effect.
第１図は従来の水圧式制御棒駆動機構を示す縦断面図
で、図中１は原子炉容器、２は筒体、３は制御棒、４は
支持筒、5,6はシールリングである。 第２図は本発明に係る電動制御棒駆動機構を示す縦断面
図で、図中11は原子炉容器、12は筒体、13は制御棒、14
は中空ピストン、15はボールネジ軸、16は電動機、17〜
25はピン／ローラ。 第３図はピン／ローラの取付部の一例を示す断面図で図
中31はピン、32はピン固定部、33はローラである。 第４図および第５図は、本発明に係る電動制御棒駆動機
構のピン／ローラ取付け部の断面図で、図中51はロー
ラ、52はカバー、53はピン、54はピン取付部。 第６図は本発明に係る電動制御棒駆動機構のピン／ロー
ラ取付部の断面図で、図中61はローラであるベアリン
グ、62はスペーサ、63はピン、64はピン取付部。FIG. 1 is a vertical cross-sectional view showing a conventional hydraulic control rod drive mechanism. In the figure, 1 is a reactor vessel, 2 is a cylinder, 3 is a control rod, 4 is a support cylinder, and 5 and 6 are seal rings. . FIG. 2 is a longitudinal sectional view showing an electric control rod drive mechanism according to the present invention, in which 11 is a reactor vessel, 12 is a cylinder, 13 is a control rod, and 14 is a control rod.
Is a hollow piston, 15 is a ball screw shaft, 16 is an electric motor, 17-
25 is a pin / roller. FIG. 3 is a cross-sectional view showing an example of a pin / roller mounting portion, in which 31 is a pin, 32 is a pin fixing portion, and 33 is a roller. 4 and 5 are sectional views of the pin / roller mounting portion of the electric control rod drive mechanism according to the present invention, in which 51 is a roller, 52 is a cover, 53 is a pin, and 54 is a pin mounting portion. FIG. 6 is a sectional view of the pin / roller mounting portion of the electric control rod drive mechanism according to the present invention. In the figure, 61 is a roller bearing, 62 is a spacer, 63 is a pin, and 64 is a pin mounting portion.
Claims (1)
制御棒を支持する中空ピストンを装着し、ボールネジ軸
を介して電動機により制御棒を上下さす構造の原子力発
電プラント用電動制御棒駆動機構であって、電動制御棒
駆動機構が、ピン取り付け部に回り止めを有して固定さ
れたピン及びピンを軸として回転するローラからなるピ
ン／ローラの組み合わせを有しており、ピン／ローラの
組み合わせにおけるローラがベアリングであり、ベアリ
ングにはボールあるいはローラの脱落を防止するカバー
がベアリングの内輪または外輪に接続されていることを
特徴とする原子力発電プラント用電動制御棒駆動機構。1. An electric control for a nuclear power plant having a structure in which a hollow piston for supporting a control rod is mounted inside a cylindrical body projecting outside the reactor vessel, and the control rod is moved up and down by an electric motor via a ball screw shaft. A rod drive mechanism, wherein the electric control rod drive mechanism has a pin / roller combination consisting of a pin fixed with a detent in the pin mounting portion and a roller rotating about the pin. A roller in a combination of rollers / rollers is a bearing, and a cover for preventing balls or rollers from falling off is connected to the inner ring or the outer ring of the bearing in the bearing, and an electric control rod drive mechanism for a nuclear power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60272415A JPH0727048B2 (en) | 1985-12-05 | 1985-12-05 | Electric control rod drive mechanism for nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60272415A JPH0727048B2 (en) | 1985-12-05 | 1985-12-05 | Electric control rod drive mechanism for nuclear power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62132194A JPS62132194A (en) | 1987-06-15 |
| JPH0727048B2 true JPH0727048B2 (en) | 1995-03-29 |
Family
ID=17513588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60272415A Expired - Lifetime JPH0727048B2 (en) | 1985-12-05 | 1985-12-05 | Electric control rod drive mechanism for nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0727048B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58176578A (en) * | 1982-04-12 | 1983-10-17 | 株式会社日立製作所 | Wet mortor type control rod drive mechanism |
| JPS599587A (en) * | 1982-07-07 | 1984-01-18 | 株式会社日立製作所 | Reactor control rod drive mechanism |
-
1985
- 1985-12-05 JP JP60272415A patent/JPH0727048B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62132194A (en) | 1987-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0727048B2 (en) | Electric control rod drive mechanism for nuclear power plant | |
| US3897878A (en) | Nuclear reactor refuelling machine | |
| US4674312A (en) | Pilgering apparatus | |
| CN210262003U (en) | Laser head and powder feeding head clamping device for roller laser cladding | |
| JPH02140692A (en) | Control rod for nuclear reactor | |
| GB2076931B (en) | A shaft mounting arrangement particularly for mounting a pinion shaft in a gearbox | |
| JPS5522571A (en) | Oil tanker flushing apparatus | |
| JPS62177488A (en) | Electric control-rod drive mechanism for nuclear power plant | |
| ES476413A1 (en) | Device for measuring the flow rate of cooling fluid at the inlet of the core of a water-cooled reactor | |
| US3321373A (en) | Nuclear reactor control mechanisms | |
| JPS62287187A (en) | Electric control rod drive mechanism for nuclear power plant | |
| JPS63108295A (en) | Control rod drive mechanism for nuclear power plant | |
| JPS6151750B2 (en) | ||
| JP5963311B2 (en) | Drive screw clearance expanding method and control rod drive mechanism using these drive screws | |
| JP2760663B2 (en) | Control rod drive mechanism | |
| JP3510570B2 (en) | Control rod drive for light water cooled reactor | |
| CN219180201U (en) | Reactor core power adjustment system | |
| JP6018897B2 (en) | Smoothing method | |
| FR2290741A1 (en) | Reactor bottom entry control rod with emergency hydraulic drive - by hollow piston has rolling contact between piston and surrounding tube | |
| JPS62177489A (en) | Abrasion-resistant and corrosion-resistant member and manufacture thereof | |
| GB2061080A (en) | Shielding container | |
| JPH04296700A (en) | Apparatus for moving radioactive source accurately and quickly | |
| JP2766301B2 (en) | Control rod drive mechanism | |
| JPS6344766Y2 (en) | ||
| SU961753A1 (en) | Mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |