JP5885596B2 - Control rod guide tube cleaning device - Google Patents

Control rod guide tube cleaning device Download PDF

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JP5885596B2
JP5885596B2 JP2012135993A JP2012135993A JP5885596B2 JP 5885596 B2 JP5885596 B2 JP 5885596B2 JP 2012135993 A JP2012135993 A JP 2012135993A JP 2012135993 A JP2012135993 A JP 2012135993A JP 5885596 B2 JP5885596 B2 JP 5885596B2
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control rod
water
guide tube
rod guide
cleaning
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JP2014001960A (en
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豊夫 佐久間
豊夫 佐久間
佐藤　信行
信行 佐藤
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Toshiba Corp
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    • 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

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Description

本発明は原子力プラント、特に、沸騰水型原子炉で用いられる制御棒案内管の清掃装置に関する。   The present invention relates to a cleaning device for a control rod guide tube used in a nuclear power plant, particularly, a boiling water reactor.

沸騰水型原子炉では、図５に示すように、原子炉圧力容器７の底部を貫通して複数の御棒駆動機構ハウジング６（以下、「ＣＲＤハウジング」という）が取り付けられており、このＣＲＤハウジング６内にはハウジング下方から制御棒駆動機構３が挿入されている。制御棒駆動機構３は制御棒５の下部と係合し、制御棒５は制御棒駆動機構３によって複数の燃料集合体１間の間隙及び制御棒案内管２内を上下動し、これにより原子炉の反応度の制御及び緊急時には全挿入して原子炉を停止する。また、燃料集合体１は炉心下部プレート８に設置された燃料支持金具４上に載置されている。   In the boiling water reactor, as shown in FIG. 5, a plurality of bar drive mechanism housings 6 (hereinafter referred to as “CRD housings”) are attached through the bottom of the reactor pressure vessel 7. A control rod drive mechanism 3 is inserted into the housing 6 from below the housing. The control rod drive mechanism 3 engages with the lower portion of the control rod 5, and the control rod 5 moves up and down in the gap between the plurality of fuel assemblies 1 and in the control rod guide tube 2 by the control rod drive mechanism 3. The reactor reactivity is controlled, and in the event of an emergency, all reactors are inserted and the reactor is shut down. Further, the fuel assembly 1 is placed on a fuel support fitting 4 installed on the core lower plate 8.

ところで、制御棒案内管２の底部には、運転期間の長期化にともない塵埃１６（以下、「クラッド」という）が付着又は堆積する。特に、制御棒案内管２の底面は凹状になっているためクラッド１６が溜まり易い。   Incidentally, dust 16 (hereinafter referred to as “cladding”) adheres or accumulates on the bottom of the control rod guide tube 2 as the operation period becomes longer. In particular, since the bottom surface of the control rod guide tube 2 is concave, the clad 16 tends to accumulate.

御棒駆動機構３の定期点検の際には、点検対象のＣＲＤハウジング６内の炉水を排水し、高線量の制御棒駆動機構３を分解点検及び洗浄することにより、ＣＲＤハウジング６内の線量は低くなる。しかしながら、上部の制御棒案内管２には長年溜まったクラッド１６が堆積しており、点検済の制御棒駆動機構３を取り付けた後の制御棒駆動機構３の内部にクラッド１６が侵入し、シールリング（図示せず）ヘのクラッド噛み込み等により摺動抵抗が増加し、その結果、制御棒駆動機構３の駆動速度が低下したり、微調整が困難になる等の問題が発生する可能性がある。   During periodic inspection of the bar drive mechanism 3, the reactor water in the CRD housing 6 to be inspected is drained, and the high-dose control rod drive mechanism 3 is disassembled, inspected and cleaned, so that the dose in the CRD housing 6 is removed. Becomes lower. However, the clad 16 accumulated for many years is accumulated in the upper control rod guide tube 2, and the clad 16 penetrates into the control rod drive mechanism 3 after the inspected control rod drive mechanism 3 is attached, and the seal 16 is sealed. Sliding resistance increases due to clad biting on a ring (not shown), and as a result, there is a possibility that the driving speed of the control rod drive mechanism 3 is lowered and fine adjustment becomes difficult. There is.

また、制御棒５を全引き抜きし制御棒駆動機構３から切り離す際に、制御棒案内管２の底部と制御棒４の着座部のメタルタッチ部（図示せず）にクラッドが噛み込み、これにより制御棒駆動機構の取外し・取付け作業時に漏水が多くなり、作業環境が悪化する可能性がある。   Further, when the control rod 5 is fully pulled out and separated from the control rod drive mechanism 3, the clad bites into the bottom of the control rod guide tube 2 and the metal touch portion (not shown) of the seating portion of the control rod 4, thereby When removing and installing the control rod drive mechanism, water leakage will increase and the work environment may deteriorate.

さらに、制御棒駆動機構３とＣＲＤハウジング６が接合するフランジ部の間のＯリング（図示せず）にクラッド１６が付着すると、原子炉圧力容器７の耐圧性が損なわれ、場合によっては炉水が制御棒駆動機構３からリークする可能性がある。   Furthermore, if the clad 16 adheres to an O-ring (not shown) between the flanges where the control rod drive mechanism 3 and the CRD housing 6 are joined, the pressure resistance of the reactor pressure vessel 7 is impaired, and in some cases the reactor water May leak from the control rod drive mechanism 3.

そのため、従来の原子力プラントでは、定検時に制御棒駆動機構３を取り外した後、制御棒案内管２に清掃装置を挿入し、制御棒案内管２の底部に付着又は堆積したクラッド１６を除去することが行われている。この清掃装置は、図６に示すように、円筒状のロッド部材３５とロッド部材３５の上部に回動可能に設けられた吸水ノズル３６から構成され、清掃時にＣＲＤハウジング６内にロッド部材３５を挿入し、吸水ノズル３６を介して制御棒案内管２内の水及びクラッド１６を吸水ポンプ２８により吸引することで、制御棒案内管３の底部に付着又は堆積したクラッド１６を除去している（特許文献１）。   Therefore, in a conventional nuclear power plant, after removing the control rod drive mechanism 3 at the regular inspection, a cleaning device is inserted into the control rod guide tube 2 to remove the clad 16 attached or deposited on the bottom of the control rod guide tube 2. Things have been done. As shown in FIG. 6, the cleaning device includes a cylindrical rod member 35 and a water absorption nozzle 36 that is rotatably provided on the upper portion of the rod member 35, and the rod member 35 is placed in the CRD housing 6 during cleaning. The clad 16 attached or deposited on the bottom of the control rod guide tube 3 is removed by inserting and sucking the water in the control rod guide tube 2 and the clad 16 through the water absorption nozzle 36 by the water absorption pump 28 ( Patent Document 1).

特開２００１−４２０８４号公報JP 2001-42084 A

ところで、上述した従来の制御棒案内管の清掃装置は、クラッドを吸引により除去するもので、制御棒案内管の底部に軽度に付着したクラッドや浮遊状態の軽量のクラッド等は除去可能であるが、制御棒案内管の底面又は内壁面に強固にこびりついているようなクラッドや重量の大きいクラッドは除去することが困難であった。そのため、放射線により作業環境が悪化したり、クラッドにより制御棒駆動機構の機能及び原子炉圧力容器の気密性が損なわれたりする等の課題があった。   By the way, the above-described conventional control rod guide tube cleaning device removes the clad by suction, and the clad slightly attached to the bottom of the control rod guide tube or the light weight clad in the floating state can be removed. It is difficult to remove a clad that is firmly attached to the bottom surface or inner wall surface of the control rod guide tube or a clad that is heavy. For this reason, there are problems such as that the working environment is deteriorated by radiation, and the function of the control rod drive mechanism and the airtightness of the reactor pressure vessel are impaired by the cladding.

本発明は上記課題を解決するためになされたもので、制御棒案内管の底面又は内壁面に付着又は堆積したクラッド、特に、強固に付着したクラッドや重いクラッドも確実にかつ効率的に除去することができる制御棒案内管の清掃装置を提供することを目的とする。   The present invention has been made to solve the above-mentioned problems, and reliably and efficiently removes a clad adhering or depositing on the bottom surface or inner wall surface of the control rod guide tube, particularly a strongly adhering clad or a heavy clad. It is an object of the present invention to provide a cleaning device for a control rod guide tube.

上記課題を解決するために、本発明に係る制御棒案内管の清掃装置は、制御棒駆動機構ハウジング及び制御棒案内管の内部に挿入可能な吸水配管及び前記吸水配管の内部に設置された注水配管とからなる本体部と、前記吸水配管の先端部に設けられ周囲に複数の開口部を有する吸水キャップと、前記注水配管の先端部に設けられた洗浄ノズルと、を備え、前記制御棒案内管の清掃時に高圧洗浄水を前記洗浄ノズルから前記開口部を介して前記制御棒案内管内に噴射し、前記高圧洗浄水をクラッドとともに前記開口部を介して前記吸水配管で吸引し外部に排出することを特徴とする。   In order to solve the above problems, a control rod guide tube cleaning device according to the present invention includes a control rod drive mechanism housing and a water absorption pipe that can be inserted into the control rod guide tube, and a water injection pipe installed in the water absorption pipe. A control part guide comprising: a main body comprising a pipe; a water absorption cap provided at a distal end of the water absorption pipe and having a plurality of openings around; and a cleaning nozzle provided at the front end of the water injection pipe. During cleaning of the pipe, high-pressure washing water is jetted from the washing nozzle into the control rod guide pipe through the opening, and the high-pressure washing water is sucked together with the clad through the opening through the opening and discharged to the outside. It is characterized by that.

本発明によれば、制御棒案内管の底面又は内壁面に付着又は堆積したクラッド、特に、強固に付着したクラッドや重いクラッドも確実にかつ効率的に除去することができる。   According to the present invention, the clad adhered or deposited on the bottom surface or inner wall surface of the control rod guide tube, in particular, the firmly adhered clad or heavy clad can be removed reliably and efficiently.

本発明の実施形態に係る制御棒案内管の清掃装置の全体構成図。The whole block diagram of the cleaning device of the control rod guide tube concerning the embodiment of the present invention. 本発明の実施形態に係る清掃時の制御棒案内管下部の拡大図。The enlarged view of the control-rod guide pipe lower part at the time of the cleaning which concerns on embodiment of this invention. （ａ）、（ｂ）は本発明の実施形態に係る注水ノズルの構成図。(A), (b) is a block diagram of the water injection nozzle which concerns on embodiment of this invention. （ａ）、（ｂ）は本発明の実施形態に係る吸水キャップの構成図。(A), (b) is a block diagram of the water absorption cap which concerns on embodiment of this invention. 制御棒案内管及び制御棒駆動機構の構成図。The block diagram of a control rod guide tube and a control rod drive mechanism. 従来の清掃装置の概略図。Schematic of the conventional cleaning apparatus.

以下、本発明に係る制御棒案内管の清掃装置の実施形態について、図１乃至図４を参照して説明する。   Hereinafter, an embodiment of a control rod guide tube cleaning device according to the present invention will be described with reference to FIGS. 1 to 4.

（構成）
本実施形態に係る制御棒案内管の清掃装置は、図１に示すように、清掃時にＣＲＤハウジング６の内部に挿入される円筒状の吸水配管２２及びその内部に設置される注水配管２１からなる本体部２０と、注水配管２１の先端部に取り付けられた注水ノズル２５と、注水ノズル２５を覆うように吸水配管２２の先端部に設けられた吸水キャップ２４と、注水配管２１に接続された注水接続配管２１ｂ及び高圧ジェット洗浄ユニット２６と、吸水配管２２に接続された吸水接続配管２２ｂ及び吸水ポンプ２８と、ＣＲＤハウジング６の下部に接続された排水配管２３ｂと、本体部２０を上下動移動可能に操作する昇降装置２７と、から構成される。 (Constitution)
As shown in FIG. 1, the control rod guide tube cleaning device according to this embodiment includes a cylindrical water absorption pipe 22 inserted into the CRD housing 6 during cleaning and a water injection pipe 21 installed therein. A main body 20, a water injection nozzle 25 attached to the front end of the water injection pipe 21, a water absorption cap 24 provided at the front end of the water absorption pipe 22 so as to cover the water injection nozzle 25, and water injection connected to the water injection pipe 21 The connecting pipe 21b and the high pressure jet cleaning unit 26, the water absorbing connecting pipe 22b and the water absorbing pump 28 connected to the water absorbing pipe 22, the drain pipe 23b connected to the lower part of the CRD housing 6, and the main body 20 can be moved up and down. And an elevating device 27 that is operated to

清掃装置の本体部２０は吸水配管２２とその中に注水管２１が挿入された２重管構造となっており、ガイドフランジ２３によりガイドされ、昇降装置２７により上下に摺動する。   The main body 20 of the cleaning device has a double pipe structure in which a water absorption pipe 22 and a water injection pipe 21 are inserted therein, is guided by a guide flange 23, and slides up and down by a lifting device 27.

吸水配管２２の先端部は制御棒５を押し上げることができるように先端部が丸みを帯びた円錐形の吸水キャップ２４が取り付けられ、この吸水キャップ２４の内部には高圧洗浄水を噴射する注水ノズル２５が格納される構造となっている。   A conical water absorption cap 24 having a rounded tip is attached to the front end of the water absorption pipe 22 so that the control rod 5 can be pushed up, and a water injection nozzle that injects high-pressure washing water into the water absorption cap 24. 25 is stored.

注水配管２１の先端部に取り付けられる注水ノズル２５は、図３（ａ）、（ｂ）に示すように、注水配管２１内の水を周囲に均一に噴射可能なように複数のノズル口２５ａが設けられている。   As shown in FIGS. 3 (a) and 3 (b), the water injection nozzle 25 attached to the tip of the water injection pipe 21 has a plurality of nozzle openings 25a so that water in the water injection pipe 21 can be uniformly injected around. Is provided.

また、吸水配管２２の先端部に設けられた吸水キャップ２４は、図４（ａ）、（ｂ）に示すように、周囲にスリット状の複数の開口部２４ａが設けられ、この開口部２４ａを介して高圧洗浄水の噴射注水並びにクラッド１６及び高圧洗浄水の吸水が行われる。   Further, as shown in FIGS. 4A and 4B, the water absorption cap 24 provided at the tip of the water absorption pipe 22 is provided with a plurality of slit-shaped openings 24a around the openings 24a. The high pressure cleaning water is injected and the clad 16 and the high pressure cleaning water are absorbed.

（作用）
このように構成された制御棒案内管の清掃装置において、制御棒案内管２内の清掃を行う際は、制御棒駆動機構３をＣＲＤハウジング６から取り外した後、ガイドフランジ２３をＣＲＤハウジング６の下部に取付け、清掃装置の本体部２０を原子炉圧力容器７の下側からＣＲＤハウジング６内に挿入する。その際、本体部２０の下端は、図１に示すように、昇降装置２７により所定長押し上げられ、これにより吸水配管２２の先端部に設けられた吸水キャップ２４が制御棒５を押し上げ、吸水キャップ２４が制御棒案内管２の下端部に位置することになる。 (Function)
In the control rod guide tube cleaning apparatus configured as described above, when cleaning the inside of the control rod guide tube 2, after removing the control rod drive mechanism 3 from the CRD housing 6, the guide flange 23 is attached to the CRD housing 6. The main body 20 of the cleaning device is inserted into the CRD housing 6 from the lower side of the reactor pressure vessel 7. At that time, as shown in FIG. 1, the lower end of the main body 20 is pushed up by a predetermined length by an elevating device 27, whereby the water absorption cap 24 provided at the tip of the water absorption pipe 22 pushes up the control rod 5, and the water absorption cap 24 is located at the lower end of the control rod guide tube 2.

なお、本体部２０は制御棒駆動機構３と同じ外形、寸法となるように設計されているため、制御棒駆動機構３の交換の際に用いられる交換装置等を用いることができる。したがって、制御棒案内管の清掃装置の装着、取り外しを制御棒駆動機構３と同様に簡便に行うことができる。   Since the main body 20 is designed to have the same outer shape and dimensions as the control rod drive mechanism 3, an exchange device or the like used when replacing the control rod drive mechanism 3 can be used. Therefore, the control rod guide tube cleaning device can be easily attached and detached in the same manner as the control rod drive mechanism 3.

次に、吸水キャップ２４が制御棒案内管２の下端部に位置決めされると、注水弁２１ａを開き高圧ジェット洗浄ユニット２６からの高圧洗浄水が注水配管２１を介して注水ノズル２５に供給されるとともに、吸水弁２２ａを開き吸水ポンプ２８を稼働する。   Next, when the water absorption cap 24 is positioned at the lower end portion of the control rod guide tube 2, the water injection valve 21 a is opened and the high pressure cleaning water from the high pressure jet cleaning unit 26 is supplied to the water injection nozzle 25 through the water injection pipe 21. At the same time, the water absorption valve 22a is opened and the water absorption pump 28 is operated.

高圧洗浄水は、図２に示すように、注水ノズル２５の複数のノズル口２５ａから開口部２４ａを介して制御棒案内管２の下部及び内壁面に向けて噴射され、制御棒案内管２の下部及び内壁面に付着したクラッド１６を剥離させ、吸水ポンプ２８の吸引力により、付着又は浮遊しているクラッド１６を洗浄水とともに開口部２４ａ、吸水配管２２、吸水接続配管２２ｂを通して、サンプピット３０に排出する。   As shown in FIG. 2, the high-pressure washing water is sprayed from the plurality of nozzle ports 25 a of the water injection nozzle 25 toward the lower part and the inner wall surface of the control rod guide tube 2 through the openings 24 a. The clad 16 adhering to the lower and inner wall surfaces is peeled off, and the adhering or floating clad 16 is washed into the sump pit 30 through the opening 24a, the water absorption pipe 22 and the water absorption connection pipe 22b together with the cleaning water by the suction force of the water absorption pump 28. Discharge.

また、ＣＲＤハウジング６に取り付けられるガイドフランジ２３は清掃装置の本体部２０の挿入をガイドする役目を果たすとともに、排水弁２３ａ、排水ホース２３ｂを介してＣＲＤハウジング６内に溜まった原子炉圧力容器７からの漏水をサンプピット３０に排水する。これにより、清掃作業の前にＣＲＤハウジング６内の水を排水することで、ＣＲＤハウジング６からの漏水による作業性の悪化を防止する。   The guide flange 23 attached to the CRD housing 6 serves to guide the insertion of the main body 20 of the cleaning device, and the reactor pressure vessel 7 accumulated in the CRD housing 6 via the drain valve 23a and the drain hose 23b. The water leaked from the water is drained into the sump pit 30. Thereby, the water in the CRD housing 6 is drained before the cleaning work, thereby preventing the workability from being deteriorated due to water leakage from the CRD housing 6.

このように、本実施形態に係る清掃工程は、（１）制御棒駆動機構３の取外し→（２）ガイドフランジ２３の取付け→（３）本体部２０の取付け、挿入→（４）高圧洗浄水の噴射及び吸引による制御棒案内管２内のクラッド１６の除去→（５）本体部２０の取外し→（６）制御棒駆動機構３の取付け、という手順で行われる。   As described above, the cleaning process according to the present embodiment includes (1) removal of the control rod drive mechanism 3 → (2) attachment of the guide flange 23 → (3) attachment and insertion of the main body 20 → (4) high pressure washing water The removal of the clad 16 in the control rod guide tube 2 by spraying and suction is performed in the order of (5) removal of the main body 20 → (6) attachment of the control rod drive mechanism 3.

また、クラッド１６は制御案内管２の底面のみならず内壁面にも付着しているため、清掃時に昇降装置によって本体部を適宜上下動させることで、高圧洗浄水の噴射位置を適宜変更するようにしてもよい。   Further, since the clad 16 is attached not only to the bottom surface of the control guide tube 2 but also to the inner wall surface, the injection position of the high-pressure washing water is appropriately changed by moving the main body portion up and down appropriately by the lifting device during cleaning. It may be.

（効果）
本実施形態によれば、高圧洗浄水を制御棒案内管の底面及び内壁面に噴射、吸引することで、制御棒案内管の底面及び内壁面に付着又は堆積したクラッド、特に、強固に付着したクラッドや重いクラッドも確実にかつ効率的に除去することができる。これにより、クラッドによる制御棒駆動機構の機能低下、原子炉圧力容器の耐圧性の低下、放射線による作業環境の悪化等を防止することができる。
また、清掃装置の外形、寸法を制御棒駆動機構と同等にしたため、既存の制御棒駆動機構の交換装置を併用することが可能となり、清掃装置の着脱を簡便に行うことができる。 (effect)
According to the present embodiment, the high pressure cleaning water is jetted and sucked onto the bottom surface and the inner wall surface of the control rod guide tube, so that the clad adhered or deposited on the bottom surface and the inner wall surface of the control rod guide tube, particularly firmly adhered. Cladding and heavy cladding can be removed reliably and efficiently. Thereby, it is possible to prevent a decrease in the function of the control rod drive mechanism due to the cladding, a decrease in pressure resistance of the reactor pressure vessel, a deterioration of the working environment due to radiation, and the like.
Further, since the outer shape and dimensions of the cleaning device are made the same as those of the control rod drive mechanism, it is possible to use an existing exchange device for the control rod drive mechanism together, and the cleaning device can be easily attached and detached.

以上、本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、組み合わせ、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, combinations, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１…燃料集合体、２…制御棒案内管、３…制御棒駆動機構、４…燃料支持金具、５…制御棒、６…制御棒駆動機構ハウジング、７…原子炉圧力容器、８…炉心下部プレート、１６…クラッド、２０…本体部、２１…注水配管、２２…吸水配管、２３…ガイドフランジ、２４…吸水キャップ、２４ａ…開口部、２５…注水ノズル、２５ａ…ノズル口、２６…高圧ジェット洗浄ユニット、２７…昇降装置、２８…吸水ポンプ、３０…サンプピット、３５…ロッド部材、３６…吸水ノズル。   DESCRIPTION OF SYMBOLS 1 ... Fuel assembly, 2 ... Control rod guide tube, 3 ... Control rod drive mechanism, 4 ... Fuel support bracket, 5 ... Control rod, 6 ... Control rod drive mechanism housing, 7 ... Reactor pressure vessel, 8 ... Lower core Plate: 16 ... Clad, 20 ... Main body, 21 ... Water injection pipe, 22 ... Water absorption pipe, 23 ... Guide flange, 24 ... Water absorption cap, 24a ... Opening, 25 ... Water injection nozzle, 25a ... Nozzle port, 26 ... High pressure jet Cleaning unit, 27 ... lifting device, 28 ... water absorption pump, 30 ... sump pit, 35 ... rod member, 36 ... water absorption nozzle.

Claims (4)

制御棒駆動機構ハウジング及び制御棒案内管の内部に挿入可能な吸水配管及び前記吸水配管の内部に設置された注水配管とからなる本体部と、前記吸水配管の先端部に設けられ周囲に複数の開口部を有する吸水キャップと、前記注水配管の先端部に設けられた洗浄ノズルと、を備え、
前記制御棒案内管の清掃時に高圧洗浄水を前記洗浄ノズルから前記開口部を介して前記制御棒案内管内に噴射し、前記高圧洗浄水をクラッドとともに前記開口部を介して前記吸水配管で吸引し外部に排出することを特徴とする制御棒案内管の清掃装置。 A main body part consisting of a water absorption pipe that can be inserted into the control rod drive mechanism housing and the control rod guide pipe, and a water injection pipe installed inside the water absorption pipe, and a plurality of surroundings provided at the tip of the water absorption pipe A water absorption cap having an opening, and a cleaning nozzle provided at the tip of the water injection pipe,
When cleaning the control rod guide tube, high-pressure washing water is jetted from the washing nozzle into the control rod guide tube through the opening, and the high-pressure washing water is sucked together with the clad through the opening through the opening. A cleaning device for a control rod guide tube which is discharged to the outside. 前記本体部を上下動させる昇降装置を備え、清掃時に前記昇降装置を上下動させることにより高圧洗浄水の噴射位置を可変とすることを特徴とする請求項１に記載の制御棒案内管の清掃装置。   The control rod guide tube cleaning according to claim 1, further comprising an elevating device that moves the main body up and down, and changing the injection position of the high-pressure washing water by moving the elevating device up and down during cleaning. apparatus. 前記注水配管を、注水弁を介して高圧ジェット洗浄ユニットに接続したことを特徴とする請求項１又は２に記載の制御棒案内管の清掃装置。   3. The control rod guide pipe cleaning device according to claim 1, wherein the water injection pipe is connected to a high-pressure jet cleaning unit via a water injection valve. 前記制御棒駆動機構ハウジングの内部の水を排出する排水装置を前記制御棒駆動機構ハウジングに取り付けたことを特徴とする請求項１乃至３のいずれか１項に記載の制御棒案内管の清掃装置。   4. The control rod guide tube cleaning device according to claim 1, wherein a drainage device for discharging water inside the control rod drive mechanism housing is attached to the control rod drive mechanism housing. .
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JPS5815759B2 (en) * 1979-10-19 1983-03-28 株式会社東芝 Nuclear reactor control rod guide tube cleaning device
JPS5889897U (en) * 1981-12-11 1983-06-17 東芝プラント建設株式会社 Control rod drive mechanism filter cleaning device
JPS59134100U (en) * 1983-02-25 1984-09-07 株式会社日立製作所 Crud removal device
JPS59224599A (en) * 1983-06-03 1984-12-17 株式会社日立製作所 Device for removing clad of guide pipe for control rod
JPS60165584A (en) * 1984-02-08 1985-08-28 株式会社日立製作所 Guide tube for control rod of reactor
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JP3069558B1 (en) * 1999-07-30 2000-07-24 株式会社日立製作所 Control rod guide tube cleaning device
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JP5752619B2 (en) * 2012-02-24 2015-07-22 株式会社日立パワーソリューションズ Apparatus and method for cleaning tip of control rod drive mechanism

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