JPH0638112B2 - Self-actuated control rod drive mechanism - Google Patents
Self-actuated control rod drive mechanismInfo
- Publication number
- JPH0638112B2 JPH0638112B2 JP63065096A JP6509688A JPH0638112B2 JP H0638112 B2 JPH0638112 B2 JP H0638112B2 JP 63065096 A JP63065096 A JP 63065096A JP 6509688 A JP6509688 A JP 6509688A JP H0638112 B2 JPH0638112 B2 JP H0638112B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- control rod
- temperature
- drive mechanism
- self
- 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
- 230000005291 magnetic effect Effects 0.000 claims description 71
- 239000002826 coolant Substances 0.000 claims description 25
- 239000000696 magnetic material Substances 0.000 claims description 18
- 230000004907 flux Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 230000005856 abnormality Effects 0.000 description 7
- 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 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 229910001004 magnetic alloy Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel 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
- 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、異常発生時に原子炉を緊急停止させるため制
御棒を炉心へ自動的に挿入する自己作動型制御棒駆動機
構に関し、更に詳しくは、制御棒を吊り下げ保持する電
磁石のコイルを遮蔽プラグの上方に設置するとともに、
その磁気回路の一部に温度感知磁性材料を使用し、冷却
材温度の異常上昇によりその飽和磁束密度が低下するこ
とを利用して制御棒を解放し落下させる制御棒駆動機構
に関するものである。Description: TECHNICAL FIELD The present invention relates to a self-actuated control rod drive mechanism for automatically inserting control rods into a core for emergency shutdown of a nuclear reactor when an abnormality occurs, and more particularly, , The coil of the electromagnet that suspends and holds the control rod is installed above the shielding plug, and
The present invention relates to a control rod drive mechanism that uses a temperature-sensitive magnetic material in a part of the magnetic circuit and releases the control rod by utilizing the fact that the saturation magnetic flux density decreases due to an abnormal rise in the coolant temperature.
［従来の技術］ 原子炉では炉停止の信頼性を高めるため出力制御用の制
御棒とは別に異常時等に炉心に挿入する制御棒を備えて
いる。これらを駆動する制御棒駆動機構は外部からのス
クラム信号により動作が開始する。そのため非常時の信
頼性が外部のスクラム信号発生機構に依存しており、炉
内異常発生からスクラムまでの信号伝達経路が複雑にな
るため炉停止の応答性並びに信頼性の点で問題があっ
た。[Prior Art] In order to improve the reliability of reactor shutdown, the reactor is equipped with control rods for power control, which are inserted into the core when an abnormality occurs. The control rod drive mechanism that drives them starts to operate in response to an external scrum signal. Therefore, the reliability in an emergency depends on the external scrum signal generation mechanism, and the signal transmission path from the occurrence of abnormalities in the reactor to the scrum becomes complicated, so there was a problem in the response and reliability of the reactor shutdown. .
これらの問題を解決するため、炉内に温度スイッチを設
け、その信号により直接制御棒を駆動する構成が提案さ
れた（例えば特開昭６０−１２７４９３号公報参照）。
ここで炉内の異常を検出する温度スイッチとしては、複
数の異種金属による熱膨張量の差を利用して接点をオン
−オフ制御する方式が採られている。In order to solve these problems, a structure in which a temperature switch is provided in the furnace and the control rod is directly driven by the signal has been proposed (for example, see Japanese Patent Laid-Open No. 60-127493).
Here, as a temperature switch for detecting an abnormality in the furnace, a method of controlling on / off of contacts by utilizing a difference in thermal expansion amount due to a plurality of different metals is adopted.
しかしこの技術では、温度スイッチは炉心近傍に設置さ
れているため放射線照射の影響を受け信頼性の点で問題
がある。また冷却材中に浸漬されているから、ステンレ
ス管内には漏洩検出器を取り付け液体冷却材の侵入の有
無を検知しなければならず、機構的にも複雑になる。However, in this technique, since the temperature switch is installed near the core, it is affected by radiation irradiation and has a problem in reliability. Further, since it is immersed in the coolant, it is necessary to install a leak detector inside the stainless steel pipe to detect the presence or absence of the liquid coolant, which makes the mechanism complicated.
そこでこのような問題を解決できるものとして、制御棒
駆動機構中に制御棒を磁気的に吸着保持するための電磁
石を設け、その磁気回路の少なくとも一部に冷却材温度
が異常に高くなった時に飽和磁束密度が低下するアモル
ファス磁性合金を組み込んだ自己作動型制御棒駆動機構
が提案された（特開昭６３−１９５９３号公報参照）。
ここで電磁石は制御棒を昇降駆動する駆動軸の下端に取
り付けられている。Therefore, as a solution to such a problem, an electromagnet for magnetically attracting and holding the control rod is provided in the control rod drive mechanism, and when the coolant temperature becomes abnormally high in at least a part of its magnetic circuit. A self-actuated control rod drive mechanism incorporating an amorphous magnetic alloy having a reduced saturation magnetic flux density has been proposed (see Japanese Patent Laid-Open No. 63-19593).
Here, the electromagnet is attached to the lower end of the drive shaft that drives the control rod up and down.
［発明が解決しようとする課題］ 前記のように従来構成の自己作動型制御棒駆動機構で
は、冷却材温度の異常上昇時に制御棒を解放し落下させ
るための電磁石（コイルおよび磁気回路）は全て原子炉
内の冷却材中に位置している。[Problems to be Solved by the Invention] As described above, in the conventional self-actuated control rod drive mechanism, all electromagnets (coils and magnetic circuits) for releasing and dropping the control rod when the coolant temperature abnormally rises are used. It is located in the coolant inside the reactor.
原子炉が金属ナトリウムを冷却材とする高速炉のような
場合には、冷却材ナトリウム温度は２００〜６００℃程
度もの高温状態となる。従って電磁石のコイルもそのよ
うな高温に耐え得るものでなければならない。In the case of a fast reactor in which a reactor uses sodium metal as a coolant, the coolant sodium temperature becomes as high as 200 to 600 ° C. Therefore, the electromagnet coil must also be able to withstand such high temperatures.
しかし冷却材温度が比較的低い場合はともかく、６００
℃もの高温で長期間にわたって使用できる信頼性の高い
コイルは未だ開発途上にある。そのため上記従来技術は
特に高温の冷却材を使用する原子炉には現在のところ適
用できない。However, if the coolant temperature is relatively low, 600
A coil with high reliability that can be used for a long time at a temperature as high as ℃ is still under development. Therefore, the above-mentioned prior art is not applicable at present to a nuclear reactor using a high temperature coolant.
本発明の目的は、上記のような従来技術の欠点を解消
し、外部からの操作力や信号に依存せずに原子炉を安全
に停止することができ、構造が単純で、しかも高温の金
属ナトリウムを冷却材として用いるような原子炉にも十
分対応することができるような信頼性の高い自己作動型
の制御棒駆動機構を提供することにある。The object of the present invention is to solve the above-mentioned drawbacks of the prior art, to safely shut down the reactor without depending on external operating force or signals, and to have a simple structure and high temperature metal. It is an object of the present invention to provide a highly reliable self-actuated control rod drive mechanism that can sufficiently support a nuclear reactor that uses sodium as a coolant.
［課題を解決するための手段］ 本発明は、制御棒と、該制御棒を昇降駆動する制御棒駆
動機構を有し、該制御棒駆動機構中に制御棒を吸着保持
するための電磁石が組み込まれており、その磁気回路の
少なくとも一部分に冷却材温度の異常上昇時に飽和磁束
密度が低下する温度感知磁性材料が使用されている構成
の自己作動型制御棒駆動機構を前提としている。[Means for Solving the Problems] The present invention has a control rod and a control rod drive mechanism for driving the control rod up and down, and an electromagnet for adsorbing and holding the control rod is incorporated in the control rod drive mechanism. It is premised on a self-actuated control rod drive mechanism in which a temperature-sensitive magnetic material whose saturation magnetic flux density decreases when the temperature of the coolant rises abnormally is used in at least a part of the magnetic circuit.
そして前記のような目的を達成するため本発明では、電
磁石のコイルは遮蔽プラグの上方に設置され、駆動軸の
下端に磁性吸着部が設けられており、前記の磁気回路
は、上端で連結され下端が開放されていて駆動軸を包む
ように垂設されている磁性部材と、それに対して摺動す
る前記磁性吸着部と、制御棒上端の磁性ハンドリングヘ
ッドからなり、前記温度感知磁性材料は、その磁気回路
の冷却材中で且つ該磁気回路を横切る位置に組み込まれ
ている。To achieve the above object, in the present invention, the coil of the electromagnet is installed above the shield plug, the magnetic attraction portion is provided at the lower end of the drive shaft, and the magnetic circuit is connected at the upper end. The temperature sensing magnetic material is composed of a magnetic member having a lower end opened so as to wrap around the drive shaft, the magnetic attracting portion that slides against the magnetic member, and a magnetic handling head at the upper end of the control rod. It is incorporated in the coolant of the magnetic circuit and at a position across the magnetic circuit.
例えば駆動軸を非磁性材料で作成し、該駆動軸を包むよ
うに垂設されている磁性部材は、断面円弧状をなし互い
に対向する如く配設された一対の温度感知磁性材料から
なり、磁性吸着部に対して相対的に摺動可能な構成とす
るのが望ましい。For example, the drive shaft is made of a non-magnetic material, and the magnetic member vertically provided so as to surround the drive shaft is made of a pair of temperature-sensitive magnetic materials arranged so as to face each other with an arcuate cross section. It is desirable that the structure be slidable relative to the portion.
［作用］ 本発明では電磁石のコイルは冷却材中ではなくて遮蔽プ
ラグの上方に設置されているから、周囲温度は比較的低
く、特に高温に対する考慮を必要としない。そのため一
般的な電磁石コイルでも使用可能となる。[Operation] In the present invention, since the coil of the electromagnet is installed not above the coolant but above the shield plug, the ambient temperature is relatively low, and it is not necessary to consider the high temperature. Therefore, a general electromagnet coil can also be used.
通常運転時においては、温度感知磁性材料は強磁性を呈
し、コイル電流によって発生する磁束が磁気回路を通
り、磁性吸着部によって制御棒上端の磁性ハンドリング
ヘッドを磁気的に吸着して該制御棒が保持する。従って
その状態で制御棒駆動機構により制御棒を昇降駆動する
ことができる。During normal operation, the temperature-sensitive magnetic material exhibits ferromagnetism, and the magnetic flux generated by the coil current passes through the magnetic circuit, and the magnetic attraction head magnetically attracts the magnetic handling head at the upper end of the control rod to cause the control rod to move. Hold. Therefore, in this state, the control rod drive mechanism can drive the control rod up and down.
原子炉に異常が生じて冷却材温度が異常上昇した場合に
は温度感知磁性材料の飽和磁束密度が急激に低下し、形
成されていた磁路が遮断され吸着保持力が失われる。そ
のため制御棒が解放されて自由落下する。When an abnormality occurs in the nuclear reactor and the coolant temperature rises abnormally, the saturation magnetic flux density of the temperature-sensitive magnetic material sharply decreases, the formed magnetic path is cut off, and the adsorption holding force is lost. Therefore, the control rod is released and falls freely.
このように本発明では原子炉の冷却材温度の異常上昇を
物理現象として感知し、外部の各種制御機を介すること
なく自己作動で制御棒を直接駆動することができる。As described above, according to the present invention, the abnormal increase in the coolant temperature of the nuclear reactor can be detected as a physical phenomenon, and the control rod can be directly driven by the self-operation without the intervention of various external controllers.
［実施例］ 第１図は本発明に係る自己作動型制御棒駆動機構の一実
施例を示す説明図であり、同図Ａは制御棒を吸着保持し
ている状態を、同図Ｂは制御棒を解放した状態をそれぞ
れ示している。また本発明の要部を第２図に、そのIII
−III断面を第３図に示す。[Embodiment] FIG. 1 is an explanatory view showing an embodiment of a self-actuated control rod drive mechanism according to the present invention. FIG. 1A shows a state in which control rods are held by suction, and FIG. Each shows the state in which the rod is released. The essential part of the present invention is shown in FIG.
The -III cross section is shown in FIG.
第１図Ａに示すように、上部に磁性ハンドリングヘッド
１０を有し内部に中性子吸収体１２を有する制御棒１４
が、炉心内の制御棒案内管１６の上方に位置し、制御棒
保持機構により保持される。制御棒保持機構は、上部案
内管１８内を挿通するように設けられた駆動軸２０と電
磁石２２等からなり、ケーブル（図示せず）によって電
源から励磁電流が供給され、励磁された電磁石２２が磁
性ハンドリングヘッド１０を吸着して制御棒１４を保持
する構成である。As shown in FIG. 1A, a control rod 14 having a magnetic handling head 10 in the upper part and a neutron absorber 12 in the inside.
Is located above the control rod guide tube 16 in the core and is held by the control rod holding mechanism. The control rod holding mechanism is composed of a drive shaft 20 provided so as to be inserted through the upper guide tube 18, an electromagnet 22 and the like, and an exciting current is supplied from a power source by a cable (not shown), and the excited electromagnet 22 is The magnetic handling head 10 is attracted to hold the control rod 14.
駆動軸２０は非磁性材料からなり、その上部にはボール
ナット２４が取り付けられ、該ボールナット２４はボー
ルネジ２６の噛み合い、ボールネジ２６の上端は駆動モ
ータ２８に結合されている。原子炉の通常運転時には駆
動モータ２８を作動させることにより、制御棒１４を上
下させ出力調整を行う。炉内になんらかの異常が生じ温
度が上昇した場合、制御棒保持機構が自己作動し、それ
によって第１図Ｂに示すように制御棒１４が切り離され
て重力で落下し原子炉を停止させる。The drive shaft 20 is made of a non-magnetic material, and a ball nut 24 is attached to the upper portion thereof. The ball nut 24 meshes with a ball screw 26, and the upper end of the ball screw 26 is connected to a drive motor 28. During normal operation of the nuclear reactor, the drive motor 28 is operated to move the control rod 14 up and down to adjust the output. When some abnormality occurs in the furnace and the temperature rises, the control rod holding mechanism self-operates, whereby the control rod 14 is separated and falls by gravity to stop the reactor as shown in FIG. 1B.
さて本発明の特徴は制御棒保持機構における電磁石２２
の構成にある。本発明ではコイル３０は遮蔽プラグ３２
の上面に位置する。そしてコイル３０の設置位置近傍か
ら遮蔽プラグ３２を貫通し冷却材３４中に達するように
磁気回路が設けられ、その磁気回路の少なくとも一部分
に冷却材温度の異常上昇時に飽和磁束密度が低下する温
度感知磁性材料が使用されている。The feature of the present invention is that the electromagnet 22 in the control rod holding mechanism is
In the configuration. In the present invention, the coil 30 is the shield plug 32.
Located on the upper surface of. A magnetic circuit is provided so as to pass through the shield plug 32 from the vicinity of the installation position of the coil 30 and reach the inside of the coolant 34, and at least a part of the magnetic circuit is temperature-sensing in which the saturation magnetic flux density decreases when the coolant temperature abnormally rises. A magnetic material is used.
本実施例では磁気回路は、第２図及び第３図に詳細に示
されている如く、駆動軸２０を包むようにそれに沿って
垂設されている一対の磁性部材３６ａ，３６ｂと、それ
らの上部を連結する上部連結部３８と、非磁性駆動軸２
０の下端に設けられている円弧状の一対の磁性吸着部４
０ａ，４０ｂを有する構成である。ここで駆動軸２０を
包むように垂設されている磁性部材３６ａ，３６ｂは前
記磁性吸着部４０ａ，４０ｂの外周面に沿うような断面
円弧状で長尺状をなし温度感知磁性材料から構成されて
おり、磁性吸着部４０ａ，４０ｂに対して相対的に摺動
可能となっている。コイル３０は前記のように遮蔽プラ
グ３２の上面位置で各磁性部材３６ａ，３６ｂにそれぞ
れ巻き付けられている。磁性部材３６ａ，３６ｂを構成
する温度感知磁性材料は、例えばアモルファス磁性合金
等であり、一定の温度（キュリー点）以上に達した時
に、その飽和磁束密度が急激に低下する性質を持つもの
である。ここではそのキュリー点が原子炉冷却材の異常
温度に対応するような材料を選定する。In this embodiment, as shown in detail in FIGS. 2 and 3, the magnetic circuit includes a pair of magnetic members 36a and 36b which are vertically provided so as to surround the drive shaft 20 and upper portions thereof. And the non-magnetic drive shaft 2
A pair of arc-shaped magnetic attraction parts 4 provided at the lower end of 0
This is a configuration having 0a and 40b. Here, the magnetic members 36a and 36b vertically provided so as to wrap around the drive shaft 20 are made of a temperature-sensitive magnetic material having an elongated shape with an arcuate cross section along the outer peripheral surfaces of the magnetic attraction portions 40a and 40b. It is slidable relative to the magnetic attraction portions 40a and 40b. As described above, the coil 30 is wound around the magnetic members 36a and 36b at the upper surface position of the shield plug 32. The temperature-sensitive magnetic material forming the magnetic members 36a and 36b is, for example, an amorphous magnetic alloy or the like, and has a property that its saturation magnetic flux density sharply decreases when reaching a certain temperature (Curie point) or higher. . Here, the material whose Curie point corresponds to the abnormal temperature of the reactor coolant is selected.
通常運転時の状態は第１図Ａ及び第２図に示す通りであ
る。電源（図示せず）からコイル３０に通電することに
よって励磁され、磁性部材３６ａ、上部連結部３８、磁
性部材３６ｂ、磁気吸着部材４０ｂ、磁性ハンドリング
ヘッド１０、磁気吸着部材４０ａからなる閉磁路が構成
される。これによって制御棒１４が吸着保持される。こ
の状態で駆動軸２０を上昇させれば制御棒１４が引き上
げられ原子炉は運転状態に入る。The state during normal operation is as shown in FIGS. 1A and 2. It is excited by energizing the coil 30 from a power source (not shown) to form a closed magnetic path including the magnetic member 36a, the upper connecting portion 38, the magnetic member 36b, the magnetic attraction member 40b, the magnetic handling head 10 and the magnetic attraction member 40a. To be done. As a result, the control rod 14 is suction-held. If the drive shaft 20 is raised in this state, the control rod 14 is pulled up and the reactor enters the operating state.
さて万一、原子炉運転中に冷却材の流量喪失等の異常が
発生した場合には原子炉内の冷却材温度が上昇する。そ
れに伴って磁気回路を構成している磁性材料の温度も上
昇する。この温度上昇が磁性部材３６ａ，３６ｂのキュ
リー点を超えるとその飽和磁束密度が急激に低下し強磁
性体から常磁性体に変化する。このためコイル３０への
通電が継続されている状態でも磁路が自然に開き、磁気
吸着部材４０ａ，４０ｂと磁性ハンドリングヘッド１０
との間での吸着力が失われてハンドリングヘッド１０が
自動的に切り離され、制御棒１４は第１図Ｂに示すよう
に落下し原子炉は停止する。By the way, if an abnormality such as loss of the flow rate of the coolant occurs during operation of the reactor, the temperature of the coolant in the reactor will rise. Along with that, the temperature of the magnetic material forming the magnetic circuit also rises. When this temperature rise exceeds the Curie point of the magnetic members 36a and 36b, the saturation magnetic flux density thereof is rapidly reduced and the ferromagnetic substance is changed to the paramagnetic substance. Therefore, even when the coil 30 is continuously energized, the magnetic path is naturally opened, and the magnetic attraction members 40a and 40b and the magnetic handling head 10 are connected.
, The handling head 10 is automatically disconnected, the control rod 14 falls as shown in FIG. 1B, and the reactor is shut down.
制御棒１４が落下して原子炉が停止すると炉内温度も低
下する。炉内温度が磁性部材３６ａ，３６ｂのキュリー
点よりも低下すればそれらの部材は再び強磁性体に戻
る。駆動モータ２８によって駆動軸２０及びそれに取り
付けられている磁性吸着部４０ａ，４０ｂを制御棒１４
頂部の磁性ハンドリングヘッド１０まで降下させ、更に
別の駆動装置（図示せず）で磁性部材３６ａ，３６ｂを
降下させて閉磁路を形成できるようにすると、再び制御
棒１４を吸着保持することができ、前記の各駆動装置に
より所定の位置まで引き上げることができる。When the control rod 14 falls and the reactor is stopped, the temperature inside the reactor also drops. If the temperature inside the furnace falls below the Curie point of the magnetic members 36a and 36b, those members will return to ferromagnetic materials. The drive shaft 20 and the magnetic attraction portions 40a and 40b attached thereto are connected to the control rod 14 by the drive motor 28.
When the magnetic handling head 10 at the top is lowered and the magnetic members 36a and 36b are further lowered by another driving device (not shown) to form a closed magnetic path, the control rod 14 can be attracted and held again. , Can be pulled up to a predetermined position by each of the driving devices described above.
以上本発明の好ましい一実施例について詳述したが、本
発明はこのような構成のみに限定されるものではない。
磁気吸着部材を温度感知磁性材料で構成してもよいし、
磁性ハンドリングヘッドをそのような温度感知磁性材料
で構成してもよい。また磁気回路の構成は上記以外の様
々な変形が可能である。Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a configuration.
The magnetic attraction member may be made of a temperature-sensitive magnetic material,
The magnetic handling head may be constructed of such temperature sensitive magnetic material. Further, the magnetic circuit can be modified in various ways other than the above.
［発明の効果］ 本発明は上記のように制御棒を吸着保持するための電磁
石コイルを遮蔽プラグの上方に設置しているため該コイ
ルの周囲温度は比較的低く、そのためナトリウム冷却型
の原子炉のように冷却材温度が高い場合でも高温に対し
て特別な考慮を払う必要がなく、一般的な電磁石コイル
を使用できるため容易に実現可能となる。またそのため
システムとしての信頼性が高まりメンテナンス性も良好
となる効果がある。EFFECTS OF THE INVENTION In the present invention, since the electromagnet coil for adsorbing and holding the control rod is installed above the shielding plug, the ambient temperature of the coil is relatively low, and therefore, the sodium cooling type nuclear reactor. Even when the coolant temperature is high as described above, it is not necessary to pay special consideration to the high temperature, and a general electromagnet coil can be used, so that it can be easily realized. Therefore, there is an effect that reliability of the system is enhanced and maintainability is improved.
更に本発明は基本的に外部からの操作力や信号に依存せ
ずに直接的に原子炉を停止できるような自己作動型であ
るから、システム全体としての構成が簡素化され、外部
機構の故障等による信頼性の低下や信号伝達経路の複雑
化のために応答性が悪くなること等を回避でき、極めて
安全性が高くなる効果がある。Further, since the present invention is basically a self-operating type that can directly stop the reactor without depending on an external operating force or signal, the configuration of the entire system is simplified and the failure of the external mechanism is caused. It is possible to avoid deterioration of responsiveness due to deterioration of reliability and complication of signal transmission path due to factors such as the above, and there is an effect that extremely high safety is achieved.
第１図Ａ，Ｂは本発明に係る自己作動型制御棒駆動機構
の一実施例を示す説明図、第２図はその要部を示す説明
図、第３図はそのIII−III断面図である。 １０……磁性ハンドリングヘッド、１４……制御棒、２
０……駆動軸、２２……電磁石、３０……コイル、３２
……遮蔽プラグ、３４……冷却材、３６ａ，３６ｂ……
磁性部材、３８……上部連結部、４０ａ，４０ｂ……磁
性吸着部。1A and 1B are explanatory views showing an embodiment of a self-actuated control rod drive mechanism according to the present invention, FIG. 2 is an explanatory view showing the main parts thereof, and FIG. 3 is a sectional view taken along the line III-III. is there. 10: Magnetic handling head, 14: Control rod, 2
0 ... drive shaft, 22 ... electromagnet, 30 ... coil, 32
...... Shielding plug, 34 …… Coolant, 36a, 36b ……
Magnetic member, 38 ... upper connecting portion, 40a, 40b ... Magnetic attraction portion.
Claims (2)
駆動機構を有し、該制御棒駆動機構中に制御棒を吸着保
持するための電磁石が組み込まれており、その磁気回路
の少なくとも一部分に冷却材温度の異常上昇時に飽和磁
束密度が低下する温度感知磁性材料が使用されているも
のにおいて、前記電磁石のコイルは遮蔽プラグの上方に
設置され、駆動軸の下端に磁性吸着部が設けられてお
り、前記の磁気回路は、上端で連結され下端が開放され
ていて駆動軸を包むように垂設されている磁性部材と、
それに対して摺動する前記磁性吸着部と、制御棒上端の
磁性ハンドリングヘッドからなり、前記温度感知磁性材
料は、その磁気回路の冷却材中で且つ該磁気回路を横切
る位置に組み込まれていることを特徴とする自己作動型
制御棒駆動機構。1. A control rod and a control rod drive mechanism for moving the control rod up and down. An electromagnet for adsorbing and holding the control rod is incorporated in the control rod drive mechanism. In at least part of which a temperature-sensitive magnetic material whose saturation magnetic flux density decreases when the temperature of the coolant rises abnormally, the coil of the electromagnet is installed above the shield plug, and the magnetic adsorption part is provided at the lower end of the drive shaft. The magnetic circuit is provided, wherein the magnetic circuit is connected at the upper end and the lower end is opened, and the magnetic member is vertically installed so as to wrap around the drive shaft,
The magnetic attraction part that slides against it and the magnetic handling head at the upper end of the control rod, and the temperature sensing magnetic material is incorporated in the coolant of the magnetic circuit and at a position crossing the magnetic circuit. Self-actuated control rod drive mechanism characterized by.
包むように垂設されている磁性部材は断面円弧状をなし
対向して配置された一対の温度感知磁性材料からなり、
磁性吸着部に対して相対的に摺動可能となっている請求
項１記載の自己作動型制御棒駆動機構。2. The drive shaft is made of a non-magnetic material, and the magnetic members suspended so as to surround the drive shaft are made of a pair of temperature-sensitive magnetic materials which are arcuate in cross section and are arranged to face each other.
The self-actuated control rod drive mechanism according to claim 1, wherein the self-actuated control rod drive mechanism is slidable relative to the magnetic attraction portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065096A JPH0638112B2 (en) | 1988-03-18 | 1988-03-18 | Self-actuated control rod drive mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065096A JPH0638112B2 (en) | 1988-03-18 | 1988-03-18 | Self-actuated control rod drive mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01239497A JPH01239497A (en) | 1989-09-25 |
| JPH0638112B2 true JPH0638112B2 (en) | 1994-05-18 |
Family
ID=13277044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63065096A Expired - Lifetime JPH0638112B2 (en) | 1988-03-18 | 1988-03-18 | Self-actuated control rod drive mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638112B2 (en) |
-
1988
- 1988-03-18 JP JP63065096A patent/JPH0638112B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01239497A (en) | 1989-09-25 |
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