JPH0378957B2 - - Google Patents
Info
- Publication number
- JPH0378957B2 JPH0378957B2 JP59233192A JP23319284A JPH0378957B2 JP H0378957 B2 JPH0378957 B2 JP H0378957B2 JP 59233192 A JP59233192 A JP 59233192A JP 23319284 A JP23319284 A JP 23319284A JP H0378957 B2 JPH0378957 B2 JP H0378957B2
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- guide tube
- permanent magnet
- permanent magnets
- sodium
- 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
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 15
- 229910052708 sodium Inorganic materials 0.000 description 15
- 239000011734 sodium Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 5
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 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
Landscapes
- Valve Device For Special Equipments (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はナトリウム冷却型原子炉の制御棒に係
わり、特に炉内の案内管に対する制御棒の制芯構
造に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control rod for a sodium-cooled nuclear reactor, and more particularly to a control rod core control structure for a guide tube inside the reactor.
従来、制御棒は駆動機構で上端をつかみ炉内に
吊り下げ、上下することによつて炉の出力を調整
するものである。ところがナトリウムの流力振動
などにより制御棒は炉心の中で振子の如く円周方
向に振れ、炉の出力に変動をもたらす。このため
制御棒が振れないようにすることが望まれてい
る。
Conventionally, a control rod is suspended in a furnace by grasping its upper end using a drive mechanism, and is moved up and down to adjust the output of the furnace. However, the control rods swing circumferentially inside the reactor core like a pendulum due to fluid vibrations in the sodium, causing fluctuations in the reactor's output. For this reason, it is desirable to prevent the control rod from swinging.
以下に図によつて従来技術を説明する。第１図
は制御棒と駆動部が連結された状態を模式的に示
した説明図である。制御棒１は下部ダツシユポツ
ト２を有する下部案内管３に挿入されており、制
御棒１はラツチ機構部４を介してラツチ軸５に連
結されている。ラツチ軸５は駆動延長軸６、ダツ
シユラム７及びガイドスリーブ８の内側を貫通し
て延長管９に連結されている。延長管９はラツチ
ベローズ１０及びストロークベローズ１１の内側
に収納されており、ラツチ軸保持機構１２を介
し、ラツチ棹１３に連結されている。ダツシユラ
ム７、ラツチベローズ１０及びストロークベロー
ズ１１等は上部案内管１４の中に収納されてお
り、上部案内管１４にはナトリウム１５に浴する
ダツシユラム７の下部にダツシユポツト１６、及
びナトリウム１５とカバーガス１７にまたがるガ
スシール機構１８が接合されている。なお、１９
はしやへいプラグであり、２０は駆動ロツドであ
る。 The prior art will be explained below with reference to figures. FIG. 1 is an explanatory diagram schematically showing a state in which a control rod and a drive section are connected. The control rod 1 is inserted into a lower guide tube 3 having a lower doss pot 2, and the control rod 1 is connected to a latch shaft 5 via a latch mechanism 4. The latch shaft 5 passes through the drive extension shaft 6, the dash ram 7 and the guide sleeve 8, and is connected to the extension tube 9. The extension tube 9 is housed inside the latch bellows 10 and the stroke bellows 11, and is connected to the latch rod 13 via the latch shaft holding mechanism 12. The dart ram 7, latch bellows 10, stroke bellows 11, etc. are housed in an upper guide tube 14, and the upper guide tube 14 has a dart pot 16 at the bottom of the dart ram 7, which is exposed to sodium 15 and a cover gas 17. A spanning gas seal mechanism 18 is joined. In addition, 19
20 is a drive rod.
第１図は原子炉を停止するために制御棒１を全
挿入した状態を示すもので、ダツシユポツト１６
にダツシユラム７が挿入されている。原子炉の定
常運転時には制御棒１は本図より上部にあり、ダ
ツシユラム７はダツシユポツト１６より抜き出し
た上部に位置する。そして制御棒１は駆動延長軸
６、ダツシユラム７、ガイドスリーブ８、延長管
９等と共に駆動ロツド２０により上下に駆動さ
れ、炉の出力が調整される。 Figure 1 shows the state in which the control rods 1 are fully inserted in order to shut down the reactor.
Dashboard ram 7 is inserted in. During steady operation of the nuclear reactor, the control rod 1 is located at the upper part of the drawing, and the dart ram 7 is located at the upper part extracted from the dart pot 16. The control rod 1, along with the drive extension shaft 6, dash ram 7, guide sleeve 8, extension tube 9, etc., is driven up and down by the drive rod 20, and the output of the furnace is adjusted.
第２図は定常運転中の制御棒１と下部案内管３
の位置関係を示したもので、制御棒１の上端が吊
られ、下端は自由状態になつている。案内管３と
制御棒１の間のギヤツプ３１は熱変形その他で制
御棒１の上下駆動時の中心と、下部案内管３の中
心がずれても、制御棒１は上下に駆動でき、炉の
出力を調整できるよう寸法が決定されている。 Figure 2 shows the control rod 1 and lower guide tube 3 during steady operation.
The upper end of the control rod 1 is suspended, and the lower end is free. The gap 31 between the guide tube 3 and the control rod 1 allows the control rod 1 to move up and down even if the center of the control rod 1 when it is driven up and down and the center of the lower guide tube 3 deviate due to thermal deformation or other reasons. The dimensions are determined so that the output can be adjusted.
第３図は制御棒１の詳細構造の一例を示す図で
ある。ステンレス鋼SUS316製の細管３２の中に
炭化ホウ素（B4C）３３を充填した制御棒要素３
４を上部端板３５と下部端板３６で支持した構造
で、制御棒要素３４は保護管３７に収納されてい
る。上下の端板にはそれぞれ上部ノズル３８と、
下部ノズル３９がついており、上部ノズル３８は
ラツチ機構２と接続できる構造になつている。下
部ノズル３９は制御棒１が最下部まで挿入された
とき、下部ダツシユポツト４０にはめ込ませる構
造になつている。第２図において下部案内管３の
中を上昇流するナトリウムの一部は下部案内管３
と、制御棒１の間のギヤツプ３１を流れる。ま
た、他の一部は下部ノズル３９に設けた孔４１よ
り制御棒１の内部に入り、下部端板３６に設けた
孔４２より制御棒要素３４の外側を通過し、上部
端板３５に設けた孔４３より出て、上部ノズル３
８に設けた孔４４から制御棒１の外に出て、下部
案内管３と、制御棒１の間のギヤツプ３１を流れ
るナトリウムと合流する。 FIG. 3 is a diagram showing an example of the detailed structure of the control rod 1. Control rod element 3 filled with boron carbide (B 4 C) 33 in a thin tube 32 made of stainless steel SUS316
4 is supported by an upper end plate 35 and a lower end plate 36, and the control rod element 34 is housed in a protection tube 37. The upper and lower end plates each have an upper nozzle 38,
A lower nozzle 39 is attached, and an upper nozzle 38 is structured to be connected to the latch mechanism 2. The lower nozzle 39 is structured to fit into the lower dart pot 40 when the control rod 1 is inserted to the lowest position. In FIG. 2, part of the sodium flowing upward in the lower guide tube 3
and the gap 31 between the control rods 1. The other part enters the inside of the control rod 1 through a hole 41 provided in the lower nozzle 39, passes through the outside of the control rod element 34 through a hole 42 provided in the lower end plate 36, and is provided in the upper end plate 35. It comes out from the hole 43 and the upper nozzle 3
It exits the control rod 1 through a hole 44 provided at 8 and joins the sodium flowing through the gap 31 between the lower guide tube 3 and the control rod 1.
制御棒１が炉の中心方向に向つて振れると炉の
出力は低下し、逆に炉心より外側方向に向つて振
れると炉の出力は上昇する。この理由は、制御棒
１が炉の中心方向に向かつて振れた場合、制御棒
１が炉心側の中性子を振れる前よりもより多く吸
収し、逆に制御棒１が炉心より外側方向に向かつ
て振れると、制御棒１が炉心より離れるので炉心
側の中性子を制御棒１が吸収する割合が減少する
ためである。 When the control rod 1 swings toward the center of the reactor, the output of the reactor decreases, and conversely, when the control rod 1 swings toward the outside of the reactor core, the output of the reactor increases. The reason for this is that when control rod 1 swings toward the center of the reactor, control rod 1 absorbs more neutrons from the core than before swinging, and conversely, when control rod 1 swings toward the outside of the reactor core, control rod 1 absorbs more neutrons than before swinging. This is because when the control rod 1 swings, it moves away from the core, so the rate at which the control rod 1 absorbs neutrons from the core side decreases.
本発明の目的は下部案内管内での制御棒のナト
リウム流力振動等による横振れを抑制し、原子炉
出力の変動を押えることのできる制御棒の制心構
造を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a control rod control structure capable of suppressing lateral vibration of a control rod in a lower guide tube due to sodium flow vibration, etc., and suppressing fluctuations in reactor output.
本発明は、下部案内管の内面と、制御棒の外面
の円周上に、それぞれ同極の永久磁石を配置し、
磁石の反発力により制御棒の振れを押え制芯する
ことを特徴とする。永久磁石は高温（約550℃以
下）、化学的に活性なナトリウム環境中で使用さ
れるため、ナトリウムとの共存性の良いオーステ
ナイトステンレス鋼又はニツケルの薄膜で保護す
る。
The present invention arranges permanent magnets with the same polarity on the inner surface of the lower guide tube and the outer surface of the control rod, respectively,
It is characterized by suppressing and controlling the deflection of the control rod by the repulsive force of the magnet. Permanent magnets are used at high temperatures (approximately 550°C or less) and in chemically active sodium environments, so they are protected with a thin film of austenitic stainless steel or nickel, which has good coexistence with sodium.
以下、本発明の実施例を図面により説明する。
第４図は本発明の一実施例を示す構造の概要であ
る。第１〜３図と同じ部品は同記号で示してあ
る。下部案内管３は通常高温ナトリウムとの共存
性の良いステンレス鋼SUS316が用いられる。案
内管３の下部には制御棒１が最下部まで挿入され
たとき、下部ノズル３９をはめ込む下部ダツシユ
ポツト２が設けられている。ダツシユポツト２よ
り上部の案内管３の内表面には制御棒１の制御範
囲の長さにわたり、円周方向90°間隙に永久磁石
４５が配置されている。一方、制御棒１には上部
端板３５と、下部端板３６に、案内管３と同様に
円周方向90°間隔に永久磁石４６が配置されてい
る。永久磁石４５と、４６はいずれもＮ極又はＳ
極のいずれか一方の同極同志のものである。永久
磁石４５と４６はそれぞれ円周方向４個所がお互
いに対向するよう配置されている。永久磁石４６
は制御棒１の保護管３７の外周に円周方向90°間
隔に取付けることもできるが、保護管３７に比
べ、厚肉でできている端板３５，３６に取付ける
方が容易である。第５図は第４図のＡ−Ａ断面を
示したもので、永久磁石の配置状況を説明したも
のである。先に述べたように制御棒１に配置した
永久磁石４６と、案内管３に配置した永久磁石４
５は互いに45°間隔で同極同志が対向するよう配
置されている。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 4 is an outline of a structure showing one embodiment of the present invention. Components that are the same as in FIGS. 1-3 are designated by the same symbols. The lower guide tube 3 is usually made of stainless steel SUS316, which has good coexistence with high-temperature sodium. A lower doss pot 2 is provided at the lower part of the guide tube 3, into which a lower nozzle 39 is fitted when the control rod 1 is inserted to the lowest position. On the inner surface of the guide tube 3 above the doss pot 2, permanent magnets 45 are arranged at intervals of 90° in the circumferential direction over the length of the control range of the control rod 1. On the other hand, in the control rod 1, permanent magnets 46 are arranged on the upper end plate 35 and the lower end plate 36 at intervals of 90° in the circumferential direction, similar to the guide tube 3. Permanent magnets 45 and 46 are both N pole or S pole.
It belongs to comrades from either side of the pole. The permanent magnets 45 and 46 are each arranged so that four positions in the circumferential direction face each other. Permanent magnet 46
can be attached to the outer periphery of the protection tube 37 of the control rod 1 at intervals of 90° in the circumferential direction, but it is easier to attach them to the thick end plates 35 and 36 compared to the protection tube 37. FIG. 5 shows a cross section taken along the line AA in FIG. 4, and explains the arrangement of the permanent magnets. As mentioned earlier, the permanent magnet 46 placed on the control rod 1 and the permanent magnet 4 placed on the guide tube 3
5 are arranged so that like-polarity comrades face each other at 45° intervals.
第４図に示した以外に永久磁石は次のように配
置することも考えられる。すなわち、制御棒１の
外周に長手方向全体にわたつて90°間隔４個所に
配置し、逆に案内管３の内面には制御棒１の制御
範囲の長さ方向に複数個所分割して配置する方法
である。いわゆる第４図に示した制御棒１と、案
内管３への永久磁石を逆に配置する事である。さ
らに永久磁石の円周方向への配置は、第５図に示
すような90°間隔に４個所の場合のほかにも180°
間隔に２個所、120°間隔に３個所、あるいはそれ
以上の個所に配置することも考えられる。さらに
案内管３の内面周方向全周及び制御棒１の外面周
方向全周を永久磁石でおおうことも考えられる。
実験の結果によれば、案内管３及び制御棒１の円
周方向に等角度で３〜４個所配置すれば制芯効果
は十分であることがわかつた。 In addition to the arrangement shown in FIG. 4, the permanent magnets may be arranged as follows. That is, they are placed on the outer periphery of the control rod 1 at four locations at 90° intervals over the entire lengthwise direction, and conversely, on the inner surface of the guide tube 3, they are arranged at multiple locations divided in the length direction of the control range of the control rod 1. It's a method. This means that the control rod 1 shown in FIG. 4 and the permanent magnets connected to the guide tube 3 are arranged in reverse. Furthermore, the permanent magnets can be arranged in the circumferential direction in four places at 90° intervals as shown in Figure 5, or at 180°.
It is also conceivable to arrange them at two locations at intervals, three locations at 120° intervals, or more locations. Furthermore, it is also conceivable to cover the entire circumference of the guide tube 3 in the inner circumferential direction and the outer circumferential direction of the control rod 1 with a permanent magnet.
According to the results of experiments, it was found that if the guide tube 3 and the control rod 1 are arranged at 3 to 4 positions at equal angles in the circumferential direction, the centering effect is sufficient.
次に、本発明に適用する永久磁石について説明
する。本発明に適用する永久磁石の要点は、高温
に長時間加熱されることにより減磁しないこと、
及び高温のナトリウムの環境との共存の良いこと
である。高温が減磁しない磁石としては、鉄、ニ
ツケル、コバルト、アルミニウム及びチタニウム
を主成分とする鋳造磁石を用いることができる。
この鋳造磁石の使用温度は最高550℃であり、本
発明の目的に十分に適用できる。また、案内管３
の内面及び制御棒１の外面に配置するための磁石
の加工も容易である。実機に適用する磁石の形状
はいろいろ考えられるが、八ツ橋状及び矩形状の
ものが一般的である。一般にこのような成分の永
久磁石は直接ナトリウム中に浸漬して長時間使用
することは不可能である。そこで、本発明では第
６図に示すように、ナトリウムとの共存性の良い
金属薄で表面を被覆する。ナトリウムとの共存性
の良い材料としてはオーステナイトステンレス鋼
及びニツケルなどである。第６図は実際の適用例
を示したもので、永久磁石は案内管３及び制御棒
１にそれぞれ磁石をはめ込むピツト４７を設け、
そのピツト４７に永久磁石４５，４６をはめ込
み、それにSUS316の薄板４８をかぶせ、アーク
溶接によつてシール溶接４９をし被覆している。
オーステナイトステンレス鋼及びニツケルのナト
リウムによる腐食は温度550℃以下では0.1μｍ／
year以下であり、永久磁石を被覆する薄板の厚
さは1.2mmで十分である。 Next, the permanent magnet applied to the present invention will be explained. The key points of the permanent magnets used in the present invention are that they do not demagnetize when heated to high temperatures for long periods of time;
and good coexistence with high-temperature sodium environments. Cast magnets whose main components are iron, nickel, cobalt, aluminum, and titanium can be used as magnets that do not demagnetize at high temperatures.
This cast magnet can be used at a maximum temperature of 550°C, and is fully applicable to the purpose of the present invention. Also, guide tube 3
It is also easy to process magnets for placement on the inner surface of the control rod 1 and the outer surface of the control rod 1. Although various shapes of magnets can be considered for use in actual machines, Yatsuhashi-shaped and rectangular shapes are common. Generally, it is impossible to directly immerse permanent magnets in sodium and use them for long periods of time. Therefore, in the present invention, as shown in FIG. 6, the surface is coated with a thin metal that has good coexistence with sodium. Examples of materials that have good coexistence with sodium include austenitic stainless steel and nickel. FIG. 6 shows an actual application example, in which the permanent magnet is provided with a pit 47 in which the magnet is fitted in the guide tube 3 and the control rod 1, respectively.
Permanent magnets 45 and 46 are fitted into the pit 47, and a thin plate 48 of SUS316 is placed over it, and a seal weld 49 is applied by arc welding.
The corrosion rate of austenitic stainless steel and nickel due to sodium is 0.1 μm/cm at temperatures below 550°C.
year or less, and a thin plate covering the permanent magnet with a thickness of 1.2 mm is sufficient.
次に第５図に示したように永久磁石を周方向に
配置した場合、案内管３と制御棒１の対向位置関
係がずれないような工夫が必要である。案内管３
の永久磁石４５の位置が一定方向になるよう配置
しておき、駆動機構ラツチ部で定まつた方向に制
御棒１をつかんで位置決めすることにより十分な
精度で対向位置は保持することができる。他の例
としては第７図に示すように案内管３の内面全周
に永久磁石を設ければ、制御棒が万一どのように
周方向に回転したとしても互いの磁石の対向関係
は維持される。逆に第８図のように制御棒１の外
面全面に永久磁石を配置しても同様の効果があ
る。 Next, when the permanent magnets are arranged in the circumferential direction as shown in FIG. 5, it is necessary to take measures to prevent the opposing positions of the guide tube 3 and the control rod 1 from shifting. Guide tube 3
The opposing positions can be maintained with sufficient accuracy by arranging the permanent magnets 45 in a fixed direction and positioning the control rod 1 by gripping the drive mechanism latch in the fixed direction. As another example, as shown in Fig. 7, if permanent magnets are provided all around the inner surface of the guide tube 3, no matter how the control rod rotates in the circumferential direction, the opposing relationship between the magnets can be maintained. be done. Conversely, the same effect can be obtained even if permanent magnets are arranged on the entire outer surface of the control rod 1 as shown in FIG.
第９図は案内管３への永久磁石４５を制御棒１
が通常の制御作動時に駆動する範囲に限り取付け
た場合の一例を示したもので、永久磁石４５は上
下に２分割され、制御棒１の上部端板３５及び下
部端板３６にそれぞれ取付けた永久磁石４６に対
向して取付けられている。 FIG. 9 shows how the permanent magnet 45 to the guide tube 3 is connected to the control rod 1.
The permanent magnet 45 is divided into upper and lower halves, and the permanent magnet 45 is attached to the upper end plate 35 and the lower end plate 36 of the control rod 1, respectively. It is attached opposite to the magnet 46.
以上説明した永久磁石取付け案内管３及び制御
棒１の作動を第９図を用いて説明する。炉芯にお
いて冷却材ナトリウムは案内管３の下部ノズル５
０より入り、流路５１を通過し、案内管３の中を
上昇する。この上昇するナトリウムの流力振動に
より制御棒１は横振れしようとする。しかし案内
管３の内面の永久磁石４５と、制御棒１の永久磁
石４６の相互反発力により制御棒１は案内管３の
中で制芯される。 The operation of the permanent magnet mounting guide tube 3 and control rod 1 described above will be explained using FIG. 9. In the furnace core, the coolant sodium flows through the lower nozzle 5 of the guide tube 3.
It enters from 0, passes through the flow path 51, and rises inside the guide tube 3. The control rod 1 tends to oscillate laterally due to the fluid vibration of the rising sodium. However, the control rod 1 is centered within the guide tube 3 due to mutual repulsion between the permanent magnet 45 on the inner surface of the guide tube 3 and the permanent magnet 46 of the control rod 1.
次に案内管３の直径が小さい場合は第６図に示
したように管内面から磁石を保護する薄板を溶接
することは困難となる。その場合には第１０図に
示すように案内管３の外面より永久磁石４５を取
付けるピツト４７を加工し、そのピツト４７の中
に永久磁石４５をはめ込み、その上にステンレス
鋼薄板４８をかぶせ、溶接４９によりシールす
る。 Next, when the diameter of the guide tube 3 is small, it becomes difficult to weld a thin plate that protects the magnet from the inner surface of the tube as shown in FIG. In that case, as shown in FIG. 10, a pit 47 for attaching the permanent magnet 45 is machined from the outer surface of the guide tube 3, the permanent magnet 45 is fitted into the pit 47, and a thin stainless steel plate 48 is placed over it. It is sealed by welding 49.
本発明によれば、制御棒表面に設けた永久磁石
と、案内管内表面に設けた永久磁石との反発力の
バランスにより、制御棒の横振れを抑制すること
ができ、制御棒の横振れが原因で生ずる炉出力の
変動を押えることができる。
According to the present invention, the horizontal deflection of the control rod can be suppressed by balancing the repulsive force between the permanent magnet provided on the surface of the control rod and the permanent magnet provided on the inner surface of the guide tube. Fluctuations in furnace output caused by this can be suppressed.
第１図はFBR用制御棒の駆動部を含めた構成
を説明する断面図、第２図は定常運転中の制御棒
と案内管の位置関係を示す図、第３図は制御棒の
構造図、第４図は本発明の一実施例を示す構造
図、第５図は第４図のＡ−Ａ断面図、第６図は本
発明になる永久磁石取付け法を説明する図、第７
図及び第８図は本発明の他の実施例を説明する断
面説明図、第９図は案内管及び制御棒の作動説明
図、第１０図は溶接シールの説明図である。
１……制御棒、３……案内管、３１……ギヤツ
プ、４５，４６……永久磁石、４７……ピツト、
４８……薄板、４９……溶接。
Figure 1 is a cross-sectional view explaining the configuration of the FBR control rod including the drive part, Figure 2 is a diagram showing the positional relationship between the control rod and guide tube during steady operation, and Figure 3 is a structural diagram of the control rod. , FIG. 4 is a structural diagram showing one embodiment of the present invention, FIG. 5 is a sectional view taken along line A-A in FIG. 4, FIG.
8 and 8 are cross-sectional explanatory views explaining another embodiment of the present invention, FIG. 9 is an explanatory view of the operation of the guide tube and control rod, and FIG. 10 is an explanatory view of the weld seal. 1... Control rod, 3... Guide tube, 31... Gap, 45, 46... Permanent magnet, 47... Pit,
48... Thin plate, 49... Welding.
Claims (1)
御棒を導く案内管において、制御棒の外面と、案
内管内面の円周上に、それぞれ同極の永久磁石を
配置したことを特徴とする制御装置。 ２ 特許請求の範囲第１項において、永久磁石を
制御棒外面及び案内管内面に、全面または周方向
等間隔に分割配置したことを特徴とする制御装
置。 ３ 特許請求の範囲第２項において、永久磁石を
制御棒外面又は案内管内面の長手方向に沿つて一
体又は分割して配置したことを特徴とする制御装
置。 ４ 特許請求の範囲第１項、第２項、第３項にお
いて、永久磁石をステンレス鋼またはニツケル薄
板にて被覆することを特徴とする制御装置。[Claims] 1. In a control rod inserted into the core of a nuclear reactor and a guide tube that guides the control rod, permanent magnets of the same polarity are installed on the outer surface of the control rod and on the circumference of the inner surface of the guide tube, respectively. A control device characterized in that: 2. The control device according to claim 1, characterized in that permanent magnets are arranged on the outer surface of the control rod and the inner surface of the guide tube, either over the entire surface or divided at equal intervals in the circumferential direction. 3. A control device according to claim 2, characterized in that a permanent magnet is arranged integrally or divided along the longitudinal direction of the outer surface of the control rod or the inner surface of the guide tube. 4. A control device according to claims 1, 2, and 3, characterized in that the permanent magnet is covered with a stainless steel or nickel thin plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59233192A JPS61112996A (en) | 1984-11-07 | 1984-11-07 | Control rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59233192A JPS61112996A (en) | 1984-11-07 | 1984-11-07 | Control rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61112996A JPS61112996A (en) | 1986-05-30 |
| JPH0378957B2 true JPH0378957B2 (en) | 1991-12-17 |
Family
ID=16951184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59233192A Granted JPS61112996A (en) | 1984-11-07 | 1984-11-07 | Control rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61112996A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0718943B2 (en) * | 1989-03-17 | 1995-03-06 | 動力炉・核燃料開発事業団 | Self-acting reactor shutdown mechanism |
| FR2759483B1 (en) * | 1997-02-12 | 1999-04-30 | Zircotube | METHOD OF MANUFACTURING A TUBE-GUIDE OF A FUEL ASSEMBLY OF A NUCLEAR REACTOR, MANDRE FOR FORGING A TUBE-GUIDE AND TUBE-GUIDE OBTAINED |
-
1984
- 1984-11-07 JP JP59233192A patent/JPS61112996A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61112996A (en) | 1986-05-30 |
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