JPH02140692A - Control rod for nuclear reactor - Google Patents
Control rod for nuclear reactorInfo
- Publication number
- JPH02140692A JPH02140692A JP63293551A JP29355188A JPH02140692A JP H02140692 A JPH02140692 A JP H02140692A JP 63293551 A JP63293551 A JP 63293551A JP 29355188 A JP29355188 A JP 29355188A JP H02140692 A JPH02140692 A JP H02140692A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- bearing
- control rod
- pin
- cobalt
- 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.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 10
- 230000005855 radiation Effects 0.000 abstract description 6
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 5
- 239000010941 cobalt Substances 0.000 abstract description 4
- 229910017052 cobalt Inorganic materials 0.000 abstract description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- GUTLYIVDDKVIGB-BJUDXGSMSA-N cobalt-58 Chemical compound [58Co] GUTLYIVDDKVIGB-BJUDXGSMSA-N 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 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
Abstract
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は原子炉用制御棒に関する。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a control rod for a nuclear reactor.
（従来の技術）
原子炉用制御棒１は第４図に示すように４体−組の燃料
集合体２，２間に挿入・引抜き自在に設けられる。この
原子炉用制御棒１はブレード３を十字状に組み合せて横
断面十字状に構成され、ブレード３の上方に第５図に示
すように先端構造材を兼ねた上部ハンドル４が設けられ
る。上部ハンドル４には孔５が設けられ、この孔５内に
第６図に示すようにガイドローラ６が収容され、このガ
イトローラ６はローラ支持ピン７で回転自在に支持され
ている。(Prior Art) As shown in FIG. 4, a control rod 1 for a nuclear reactor is provided between four fuel assemblies 2, 2 so as to be freely insertable and withdrawn. This nuclear reactor control rod 1 has blades 3 assembled in a cross shape to have a cross-shaped cross section, and above the blades 3 is provided an upper handle 4 which also serves as a tip structure member, as shown in FIG. A hole 5 is provided in the upper handle 4, and a guide roller 6 is accommodated in the hole 5 as shown in FIG. 6, and the guide roller 6 is rotatably supported by a roller support pin 7.
また、ブレード３の下部には下部ハンドル９が接続され
、またスピードリミッタ８の下方にリミッタローラ１０
が設けられている。このリミッタローラ１０は第７図お
よび第８図に示すようにピン１３によって回転自在に支
持されている。なお、第８図中筒号１２は切込み部、第
５図および第７図中筒号１１は制御棒駆動機構（図示せ
ず）に接続されるソケット部である。A lower handle 9 is connected to the lower part of the blade 3, and a limiter roller 10 is connected to the lower part of the speed limiter 8.
is provided. This limiter roller 10 is rotatably supported by a pin 13 as shown in FIGS. 7 and 8. Note that the cylinder number 12 in FIG. 8 is a notch, and the cylinder number 11 in FIGS. 5 and 7 is a socket portion connected to a control rod drive mechanism (not shown).
しかして、原子炉の起動および停止、通常の出力制御、
さらには緊急時の停止および復帰等において、制御棒を
駆動する際、ガイドローラ６およびリミッタローラ１０
が回転し、各ローラ６．１０と燃料集合体２の側面と制
御棒駆動機構の案内筒との間で摩擦損耗を生じる。Therefore, starting and stopping the reactor, normal output control,
Furthermore, when driving the control rod during emergency stop and return, etc., the guide roller 6 and limiter roller 10
rotates, causing frictional wear between each roller 6.10, the side surface of the fuel assembly 2, and the guide tube of the control rod drive mechanism.
（発明が解決しようとする課題）
ところで、一般にこのような耐摩耗性を必要とする部品
にはコバルトを約５０％含有するいわゆるステライトと
称する合金を使用する。この合金の摩擦損耗による生成
物や腐食生成物などがコバルトを含むことになる。その
ため原子炉内で使用する場合、中性子の照射によりコバ
ルト６０となって放射線源となり原子力発電プラントの
放射線量を増加させる恐れがある。これらの蓄積された
放射線源は、原子力発電プラントの定期検査時における
作業従事者の被曝量を増加させ、ひいてはプラントの稼
動率を低下せしめる恐れがあった。(Problems to be Solved by the Invention) By the way, an alloy called stellite containing about 50% cobalt is generally used for parts that require such wear resistance. Cobalt is contained in products caused by frictional wear and corrosion of this alloy. Therefore, when used in a nuclear reactor, there is a risk that irradiation with neutrons will turn it into cobalt-60, which will become a radiation source and increase the radiation dose in a nuclear power plant. These accumulated radiation sources may increase the radiation exposure of workers during periodic inspections of nuclear power plants, and may even reduce the plant's operating rate.
一方、コバルト６０の蓄積を防ぐため、最近ニッケル基
合金が使用され始めているが、ニッケルは中性子の照射
によりコバルト５８となり、コバルト６０と同様に作業
従事者の放射線被曝量を増加させる可能性がある。On the other hand, nickel-based alloys have recently begun to be used to prevent the accumulation of cobalt-60, but nickel becomes cobalt-58 when irradiated with neutrons, which, like cobalt-60, can increase radiation exposure for workers. .
即ち、コバルト基合金あるいは、ニッケル基合金で構成
されたガイドローラまたはピン、およびリミットローラ
または、ピンを原子炉制御棒に使用すると、ピンとロー
ラ内面が摺動摩擦して摩耗を生じ、ローラが滑らかに回
転しにくくなる。その結果、制御棒の作動が困難になり
、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その相手部材との摩擦が
ころがり摩擦から摺動摩擦となり、摩擦係数が大幅に上
昇して制御棒の挿入、引抜きが困難になる。In other words, when guide rollers or pins and limit rollers or pins made of cobalt-based alloys or nickel-based alloys are used in nuclear reactor control rods, sliding friction occurs between the pins and the inner surface of the rollers, causing wear and preventing the rollers from becoming smooth. It becomes difficult to rotate. As a result, the control rods become difficult to operate and cannot be used for a long period of time. In addition, if the wear is significant, the inner surface of the roller and the pins will seize and the roller will no longer rotate, causing the friction between the outer circumference of the roller and its mating member to change from rolling friction to sliding friction, resulting in a significant increase in the coefficient of friction. This makes it difficult to insert and withdraw the control rod.
また摩擦による摩耗性生成物や腐食生成物が中性子の照
射により放射化し、原子力発電プラントの放射線量率を
上昇させ定期検査時における作業従事者の被ばく量を増
加させることになる。In addition, abrasive products and corrosion products caused by friction are activated by neutron irradiation, increasing the radiation dose rate of nuclear power plants and increasing the amount of radiation exposure of workers during periodic inspections.
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、かつコバルト５８またはコバ
ルト６０による放射線線量率の上昇を抑制した原子力発
電プラント用制御棒を提供すること目的とする。The present invention has been made in view of these points, and an object of the present invention is to provide a control rod for a nuclear power plant that allows smooth insertion and withdrawal of the control rod and suppresses an increase in radiation dose rate due to cobalt-58 or cobalt-60. shall be.
（課題を解決するための手段）
制御棒に装着されるピン／ローラの組合せにおいて、当
該ピン／ローラがベアリングを有しており、このベアリ
ングの材料が鉄基合金から成る原子力発電プラント用制
御棒である。(Means for Solving the Problem) A control rod for a nuclear power plant, in which a pin/roller combination attached to a control rod has a bearing, and the bearing material is made of an iron-based alloy. It is.
（作 用）
ベアリングと燃料集合体間の摩擦が低減され、摩耗が少
くなり、コバルトの放射化による作業員のひばくが低減
される。(Function) Friction between the bearing and the fuel assembly is reduced, reducing wear and reducing worker exposure due to cobalt activation.
（実 施 例）
制御棒に装着されるピン／ローラの組合せにおいて、第
１図に示すようにローラ１４はベアリングで構成されて
おり、ピン１５はピン取付部１６に回り止めを有して固
定された構造を有する。また、上記ピン／ローラの組合
せにおいて第２図、第３図に示したようにローラ１４で
あるベアリングのボールあるいはローラの脱落等を防止
するカバー１７をベアリングの外輪または内輪に設けて
もよい。(Example) In the pin/roller combination attached to the control rod, as shown in FIG. It has a built-in structure. Further, in the pin/roller combination described above, a cover 17 may be provided on the outer ring or inner ring of the bearing to prevent the ball or roller of the bearing, which is the roller 14, from falling off, as shown in FIGS. 2 and 3.
さらにまた上記ベアリングの材料を鉄基合金とするのが
好ましい。本発明に係るようにローラをベアリングとす
ると、ベアリングの外輪が相手部材ところがり摩擦をし
、またベアリング外軸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、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擦をしない。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。Furthermore, it is preferable that the material of the bearing is an iron-based alloy. When the roller is a bearing as in the present invention, the outer ring of the bearing causes rolling friction with the mating member, the inner surface of the outer shaft of the bearing and the outer surface of the inner ring cause rolling friction with the balls or rollers of the bearing, and the inner surface of the inner ring of the bearing and the outer surface of the inner ring cause rolling friction. There is sliding friction with the pin, but since the coefficient of friction is much smaller than the sliding friction coefficient, there is almost no sliding friction between the pin and the inner ring of the bearing. Therefore, even after long-term use, the rollers rotate smoothly and the control rod can operate with high precision. Note that dimensional accuracy and finishing accuracy of the pin outer diameter and roller inner diameter are not required as much as in the conventional type, and processing is easier.
また、ボールあるいはローラの脱落を防止するカバーを
ベアリングの内輪あるいは外輪につけることにより、ロ
ーラであるベアリングに万が一過大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、安全性を高めることが可能となる。In addition, by attaching a cover to the inner or outer ring of the bearing to prevent the balls or rollers from falling off, even if excessive stress is applied to the bearing, which is a roller, safety is ensured so that the ball or roller of the bearing does not fly out. It is possible to increase it.
尚、ベアリング用材料には、放射線被ばく低減の観点か
らコバルト基合金やニッケル基合金の変わりに鉄基合金
を使用する。鉄基合金は、特開昭６３−２３５８９５号
公報に記載されているものが最高である。In addition, from the viewpoint of reducing radiation exposure, an iron-based alloy is used for the bearing material instead of a cobalt-based alloy or a nickel-based alloy. The best iron-based alloys are those described in JP-A-63-235895.
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を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
トの稼動率向上、放射線被ばくの低減を図れるなど顕著
な効果がある。Frictional resistance and frictional wear on the pins/rollers that occur when the reactor starts and stops and the output rises and falls can be reduced, allowing control rods to be driven stably and with high precision over a long period of time, which in turn improves plant operating efficiency. , it has remarkable effects such as reducing radiation exposure.
第１図は、本発明に係わる制御棒のピン／ローラ（ベア
リング）取付は部の一実施例を示す断面図、第２図は本
発明にかかる制御棒のピン／ローラ（ベアリング）取付
は部の他の実施例を示す断面図、第３図は本発明にかか
る他の実施例を示す３・・・ブレード
８・・・スピードリミック
１４・・・ローラ
１５・・・ピン
１６・・・ピン取付部
１７・・・カバー
代理人 弁理士 則 近 憲 佑
同 第子丸 健
棒の全体を示す概略側面図、第６図は第５図のＡ部を拡
大して示す図、第７図は第５図のＶＩ−ＶＩ線に沿う断
面図、第８図は第７図のＢ部を拡大して示す側面図であ
る。
第
図
第
図
第
図FIG. 1 is a cross-sectional view showing an embodiment of the control rod pin/roller (bearing) mounting section according to the present invention, and FIG. 2 is a control rod pin/roller (bearing) mounting section according to the present invention. FIG. 3 is a sectional view showing another embodiment of the present invention. 3...Blade 8...Speed rimming 14...Roller 15...Pin 16...Pin Attachment part 17...Cover agent Patent attorney Noriyuki Chika Ken Yudo Daishimaru A schematic side view showing the entire Kenbo. Figure 6 is an enlarged view of part A in Figure 5. Figure 7 is an enlarged view of part A in Figure 5. FIG. 5 is a sectional view taken along the line VI--VI, and FIG. 8 is an enlarged side view of section B in FIG. 7. Figure Figure Figure Figure
Claims (1)
部に取り付けられるブレードと、このブレードの下方に
ローラを有してなるスピードリミッタとを具備してなる
原子炉用制御棒において、ローラはベアリングからなり
しかもこのベアリングは鉄基合金であることを特徴とす
る原子炉用制御棒。A control rod for a nuclear reactor comprising an upper handle having a roller, a blade attached to the lower part of the upper handle, and a speed limiter having a roller below the blade, the roller may be comprised of a bearing. This bearing is a nuclear reactor control rod characterized by being made of an iron-based alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63293551A JPH02140692A (en) | 1988-11-22 | 1988-11-22 | Control rod for nuclear reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63293551A JPH02140692A (en) | 1988-11-22 | 1988-11-22 | Control rod for nuclear reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02140692A true JPH02140692A (en) | 1990-05-30 |
Family
ID=17796219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63293551A Pending JPH02140692A (en) | 1988-11-22 | 1988-11-22 | Control rod for nuclear reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02140692A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6574295B2 (en) * | 2001-02-23 | 2003-06-03 | Hitachi, Ltd. | Boiling water type nuclear reactor use control rod |
-
1988
- 1988-11-22 JP JP63293551A patent/JPH02140692A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6574295B2 (en) * | 2001-02-23 | 2003-06-03 | Hitachi, Ltd. | Boiling water type nuclear reactor use control rod |
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