JP2006349596A - Grinding method and grinding system of nozzle inside of reactor vessel - Google Patents

Grinding method and grinding system of nozzle inside of reactor vessel Download PDF

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JP2006349596A
JP2006349596A JP2005178826A JP2005178826A JP2006349596A JP 2006349596 A JP2006349596 A JP 2006349596A JP 2005178826 A JP2005178826 A JP 2005178826A JP 2005178826 A JP2005178826 A JP 2005178826A JP 2006349596 A JP2006349596 A JP 2006349596A
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nozzle
cutting
reactor vessel
cutting device
vessel
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JP4444168B2 (en
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Eiji Yokoe
英治 横江
Hiroyuki Dosaka
博幸 堂坂
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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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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Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method of nozzle inner surface of a reactor vessel capable of grinding welding parts of nozzles of the reactor vessel and outlet and inlet pipes connecting the nozzles in the air safely for workers, quickly and easily, and a grinding system of the nozzle inner surface of the reactor vessel which can grind the welding parts in the air. <P>SOLUTION: In the grinding method of nozzles of a reactor vessel for grinding welding part (m) of nozzles 2 provided on the side of the reactor vessel 1 and outlet/inlet pipes 2a connected to the nozzles 2, frames 3 having openings 3a on the side adjusting the position of the nozzles 2 are provided to the reactor vessel 1 in a state that cooling water is drained at least to the lower position of the nozzles 2. After inserting cylindrical shields (4, 5) in the nozzles 2 from the openings 3a, the grinding system 6 is inserted in the nozzle 2 to grind the welding part (m). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、既存するＰＷＲ型原子力発電所の原子力圧力容器の出、入口管台内面の切削方法および切削装置に関するものである。   The present invention relates to a method and an apparatus for cutting an exit of a nuclear pressure vessel of an existing PWR type nuclear power plant and an inner surface of an inlet nozzle.

原子力発電所ではその安全性や信頼性を確保するために定期的に、配管や圧力容器の検査が行われており、同検査には超音波を用いた非破壊検査（以下ＵＴ：Ｕｌｔｒａｓｏｎｉｃ Ｔｅｓｔｉｎｇ）が適用されている。
しかし、検査の結果、原子炉容器の出、入口管の管台の溶接部に、経年変化によるクラックなどの表面欠陥が判明しても、これまで、それら欠陥箇所を切削、ひいては補修する具体的方法および装置は提案されておらず、表面欠陥を補修することはできなかった。
但し、沸騰水型原子炉容器のノズルを修理する方法として、ノズルの安全端部が第１の溶接部によってノズル胴体に結合され、第１の断熱用スリーブがノズル胴体の第１の中孔の内側に配置されていて、その１端が安全端部の第２の中孔と締りばめになっているノズルで、第１及び第２の中孔の間の締りばめ部における漏れを減らすようにノズルを修理するものは、提案されている（特許文献１参照方）。
特開平７−１２９７８号公報（図１） At nuclear power plants, pipes and pressure vessels are regularly inspected to ensure their safety and reliability. Non-destructive inspection (hereinafter referred to as UT: Ultrasonic Testing) using ultrasonic waves is performed. Has been applied.
However, as a result of inspection, even if surface defects such as cracks due to secular change are found in the reactor vessel exit and the welded part of the inlet pipe pedestal, until now, such defects have been cut and eventually repaired. A method and apparatus have not been proposed and surface defects could not be repaired.
However, as a method of repairing the nozzle of the boiling water reactor vessel, the safety end of the nozzle is connected to the nozzle body by a first weld, and the first thermal insulation sleeve is connected to the first bore of the nozzle body. Nozzle located on the inside, one end of which is an interference fit with the second bore of the safety end, to reduce leakage in the interference fit between the first and second bores Thus, what repairs a nozzle is proposed (refer patent document 1).
Japanese Patent Laid-Open No. 7-12978 (FIG. 1)

本発明は、原子力容器の管台と、管台に接続する出、入口管との溶接部の切削を、気中状態で、作業員が安全に、迅速かつ容易に行い得る原子炉容器の管台内面の切削方法、および、気中状態で該溶接部の切削を行い得る原子炉容器の管台内面の切削装置を提案することを目的とする。   The present invention relates to a reactor vessel tube in which an operator can safely, quickly and easily perform cutting of a welded portion between a nozzle base of a nuclear vessel, an outlet connected to the nozzle nozzle, and an inlet pipe in an air state. It is an object of the present invention to propose a method for cutting the inner surface of a table and a cutting device for an inner surface of a nozzle table of a reactor vessel capable of cutting the welded portion in the air.

本発明は上記課題を解決するために、以下の（１）〜（４）の手段を採用する。
（１）第１の手段は、原子炉容器の側面に設けられている管台と、同管台に接続されている出、入口管との内周の溶接部を切削する原子力容器の管台内面の切削方法において、少なくとも管台の下方位置まで冷却水を排水した状態の原子力容器内に、管台の位置に合わせた開口部を側面に有す架台を設置し、次に、前記開口部から管台内に円筒状の遮蔽体を挿入設置した後、管台内に切削装置を挿入して前記溶接部を切削することを特徴とするものである。
（２）第２の手段は前記手段（１）に係る原子力容器の管台内面の切削方法において、前記切削装置は切粉回収ノズルを装備しており、常時切粉を回収しながら切削を行うことを特徴とするものである。
（３）第３の手段は前記手段（１）又は（２）に記載の切削方法により前記溶接部の内周を切削した後、切削部に所定の溶接肉盛りを施工し、次に、前記切削装置により仕上げ切削を行うことを特徴とするものである。
（４）第４の手段は、原子炉容器の側面に設けられている管台と、同管台に接続されている出、入口管との内周の溶接部を切削する原子力容器の管台内面の切削装置において、切削を行うカッタを収納すると共にカッタを囲んで管台内周面に沿う切粉回収ノズルを具えるヘッド部と、前記ヘッド部を管台内周に沿って軸回動する駆動部を有する胴部と、前記ヘッド部内の切粉を吸引する切粉回収用ラインとを具えたことを特徴とするものである。 The present invention employs the following means (1) to (4) in order to solve the above problems.
(1) The first means includes a nozzle provided on the side surface of the reactor vessel, and a nozzle for the nuclear vessel that cuts the inner periphery of the outlet and the inlet pipe connected to the nozzle. In the inner surface cutting method, a gantry having an opening on the side surface that is aligned with the position of the nozzle is installed in a nuclear vessel in which cooling water has been drained to at least a position below the nozzle, and then the opening After a cylindrical shield is inserted and installed in the nozzle, a cutting device is inserted into the nozzle to cut the welded portion.
(2) The second means is a method for cutting the inner surface of the nozzle base of the nuclear vessel according to the means (1), wherein the cutting device is equipped with a chip collection nozzle and performs cutting while always collecting chips. It is characterized by this.
(3) The third means cuts the inner periphery of the welded portion by the cutting method described in the means (1) or (2), and then applies a predetermined weld overlay on the cut portion, It is characterized by performing finish cutting with a cutting device.
(4) A fourth means includes a nozzle provided on the side surface of the reactor vessel, and a nozzle of the nuclear vessel that cuts the inner periphery of the outlet and the inlet pipe connected to the nozzle. In an inner surface cutting device, a head portion that contains a cutter for cutting and surrounds the cutter and includes a chip collecting nozzle along the inner peripheral surface of the nozzle, and the head portion pivots along the inner periphery of the nozzle And a chip collecting line for sucking the chips in the head section.

第１の手段よりなる請求項１に記載の原子力容器の管台内面の切削方法によれば、これまで提案されていなかった原子炉容器の管台溶接部の内周の切削施工が、初めて達成できる。また、原子炉容器内に架台を設置することにより、切削装置の管台内への搬入がクレーン操作や作業者により安全容易に行うことができる。また、遮蔽体を管台内に挿入することで、開口部などから洩れる放射線の遮蔽および開口部隙間からの異物の飛散落下防止が図れると共に、切削装置の管台内へのスライド案内が容易に行い得る。
第２の手段よりなる請求項２に記載の原子力容器の管台内面の切削方法によれば、上記手段（１）の作用効果を奏すると共に、切削時の切粉を系外に排出できるので、原子炉容器内の環境品質が保たれる。
第３の手段よりなる請求項３に記載の原子力容器の管台内面の切削方法によれば、上記手段（１）又は（２）の作用効果を奏すると共に、管台溶接部の補修が行い得、原子炉の長期安定稼動が達成できる。
第４の手段よりなる請求項４に記載の原子炉容器の管台内面の切削装置によれば、これまで提案されていなかった原子炉容器の管台溶接部の内周の切削施工が、初めて行い得る。また、駆動部によりヘッド部を軸回動させることにより、切削対象部である管台溶接部の内周面の切削が連続的に行い得、管台溶接部の切削、ひいては、管台溶接部の補修を迅速に行い得る。また、切削時に発生する切粉は切粉回収ノズルにより捕集されるので、切粉の飛散が防止でき、原子炉容器内の環境品質を損なうことなく、切削施工が行い得る。 According to the method for cutting the inner surface of the nozzle of the nuclear vessel according to claim 1, comprising the first means, the cutting work on the inner periphery of the welded portion of the reactor vessel that has not been proposed so far has been achieved for the first time. it can. In addition, by installing a gantry in the reactor vessel, the cutting device can be carried into the tube base safely and easily by a crane operator or an operator. Also, by inserting the shield into the nozzle, it is possible to shield the radiation leaking from the opening and the like and prevent the foreign matter from being scattered and dropped from the gap between the openings, and to easily slide the cutting device into the nozzle. Can be done.
According to the cutting method of the nozzle inner surface of the nuclear vessel according to claim 2, comprising the second means, the effect of the means (1) can be obtained, and the chips at the time of cutting can be discharged out of the system. The environmental quality in the reactor vessel is maintained.
According to the method for cutting the inner surface of the nozzle base of the nuclear vessel according to claim 3, comprising the third means, the effect of the above means (1) or (2) can be achieved and the welded portion of the nozzle can be repaired. Long-term stable operation of the reactor can be achieved.
According to the cutting apparatus for the inner surface of the reactor vessel nozzle according to claim 4 comprising the fourth means, the cutting work on the inner circumference of the welded portion of the reactor vessel nozzle which has not been proposed so far is the first time. Can be done. Further, by turning the head part by the driving part, the inner peripheral surface of the nozzle welded part, which is a cutting target part, can be continuously cut, and the nozzle welded part can be cut, and hence the nozzle welded part. Can be repaired quickly. Further, since the chips generated during cutting are collected by the chip collection nozzle, the chips can be prevented from being scattered, and the cutting work can be performed without impairing the environmental quality in the reactor vessel.

図１ないし図１０は本発明に係る原子炉容器の管台内面の切削方法および装置の実施例図であり、図１は原子力容器に架台を設置した状態を示す断面図、図２の（ａ）は図１のＡ部の内面切削時の拡大説明図、（ｂ）はクラッディング時の拡大説明図、（ｃ）は内面仕上げ時の拡大説明図である。図３は管台内に切削装置を挿入した状態を示す斜視図である。図４は管台内に切削装置を設置した状態の作業概念図、図５は検査装置の断面図、図６は図５のＰ−Ｐ矢視図、図７は図６のＱ−Ｑ矢視図、図８は図７のＲ−Ｒ矢視図、図９は図６のＳ−Ｓ矢視図、図１０は図６のＴ−Ｔ矢視図である。なお、図１は断面図であるが、主要部分のみをハッチングしている。
図１ないし図３により、本実施例に係る出、入口管台内面切削装置（以下切削装置と称する）を用いた作業概要を説明する。図１ないし図３に於いて、原子炉容器（１）の側面外周方向には内側から貫通する中空円筒状の複数個の管台（２）が設けられていて、各管台（２）には出、入口管（２ａ）が溶接により接続されている。本実施例に係る切削装置（６）はそれらの溶接部（ｍ）の内面を切削するものである。 FIG. 1 to FIG. 10 are diagrams showing an embodiment of the method and apparatus for cutting the inner surface of a reactor vessel according to the present invention. FIG. 1 is a sectional view showing a state in which a gantry is installed on a nuclear vessel. ) Is an enlarged explanatory view at the time of inner surface cutting of part A of FIG. 1, (b) is an enlarged explanatory view at the time of cladding, and (c) is an enlarged explanatory view at the time of inner surface finishing. FIG. 3 is a perspective view showing a state in which the cutting device is inserted into the nozzle. 4 is a conceptual diagram of the work in a state where the cutting device is installed in the nozzle, FIG. 5 is a cross-sectional view of the inspection device, FIG. 6 is a view taken along the line PP in FIG. 5, and FIG. FIG. 8 is an RR arrow view of FIG. 7, FIG. 9 is an SS arrow view of FIG. 6, and FIG. 10 is a TT arrow view of FIG. Although FIG. 1 is a cross-sectional view, only the main part is hatched.
1 to 3, an outline of work using the outlet and inlet nozzle inner surface cutting device (hereinafter referred to as a cutting device) according to the present embodiment will be described. 1 to 3, a plurality of hollow cylindrical nozzles (2) penetrating from the inside are provided in the outer peripheral direction of the side surface of the reactor vessel (1). The inlet pipe (2a) is connected by welding. The cutting device (6) according to the present embodiment cuts the inner surface of the welded portion (m).

溶接部（ａ）を切削補修する場合には、次の手順で行う。
Ａ．図１に示すように、原子炉容器（１）内の冷却水（１ａ）は、少なくとも管台（２）よりも水位が下になるように予め排水しておく。
Ｂ．原子炉容器（１）内に有底円筒状の作業架台（３）を、ピン（３ｂ）により回り止めを施して載置する。
Ｃ．次に、作業架台（３）の開口部（３ａ）に、ノズル遮蔽体（４）および部分遮蔽体（５）よりなる遮蔽体を挿入設置し、それらを図３に示すフランジ（３ｃ）により、作業架台（３）にボルト止めする。また、図１に示すように、出、入口管（２ａ）内に、管台遮へい４８とシールプラグ４９とよりなる止め栓を設置し、放射線遮へいおよびシールを図る。
Ｄ．次に、管台（２）内に切削装置（６）を設置据付固定して、切削装置（６）により切削を行い、全体としてリング状の溝（ア）を形成する（図２の（ａ）参照方）。切削範囲は図２の（ａ）に示すように、溶接部（ｍ）を跨ぐ溝幅の切削溝であって、管台（２）の溶接部（ｍ）の内面全周を切削する。切削形成後、切削装置（６）を取外す。
Ｅ．次に、自動溶接装置（図示せず）により溝（ア）に所定合金種の溶接肉盛（イ）を、行う。溶接完了後、自動溶接装置を取外す。
Ｆ．次に、再度、管台（２）内に切削装置（６）を設置据付固定して、切削装置（６）により仕上げ切削を行い、溶接部（ｍ）の表面を平らにする（図２の（ｃ）参照方）。内面仕上げ後、切削装置（６）、作業架台（３）などを取外す。
以上により、溶接部（ｍ）の切削補修が完了する。なお、上記Ｄ手順での、管台（２）内への切削装置（６）の挿入は、クレーン吊した切削装置（６）を作業者が押治具などを用いて行うが、その際に、作業架台（３）の床上に管台（２）の高さレベルに合わせた案内台を設けておくことで、管台（２）の挿入作業を容易ならしめている。
また、加圧水型原子炉の原子炉容器（１）の管台（２）は、４ないし８個の偶数個、設けられており、２個またはそれ以上の管台（２）の切削補修を同時に施工すれば、工期短縮が図れる。 When repairing the welded portion (a) by cutting, the following procedure is used.
A. As shown in FIG. 1, the cooling water (1a) in the reactor vessel (1) is drained in advance so that the water level is at least lower than the nozzle (2).
B. A bottomed cylindrical work platform (3) is placed in the reactor vessel (1) while being prevented from rotating by a pin (3b).
C. Next, a shielding body composed of the nozzle shielding body (4) and the partial shielding body (5) is inserted and installed in the opening (3a) of the work platform (3), and these are installed by the flange (3c) shown in FIG. Bolt to work platform (3). Further, as shown in FIG. 1, a stopper plug composed of a nozzle block 48 and a seal plug 49 is installed in the outlet / inlet pipe (2a) for radiation shielding and sealing.
D. Next, the cutting device (6) is installed, installed and fixed in the nozzle (2), and cutting is performed by the cutting device (6) to form a ring-shaped groove (a) as a whole ((a in FIG. 2). ) How to refer) As shown in FIG. 2A, the cutting range is a cutting groove having a groove width straddling the welded portion (m), and cuts the entire inner surface of the welded portion (m) of the nozzle (2). After cutting, the cutting device (6) is removed.
E. Next, welding build-up (A) of a predetermined alloy type is performed on the groove (A) by an automatic welding apparatus (not shown). After welding is complete, remove the automatic welding equipment.
F. Next, the cutting device (6) is installed and fixed again in the nozzle (2), and finish cutting is performed by the cutting device (6) to flatten the surface of the welded portion (m) (see FIG. 2). (C) Reference method). After finishing the inner surface, remove the cutting device (6), work platform (3), etc.
Thus, the cutting repair of the welded portion (m) is completed. In addition, the insertion of the cutting device (6) into the nozzle (2) in the above-mentioned procedure D is performed by the operator using a pressing jig or the like on the crane-suspended cutting device (6). By providing a guide base that matches the height level of the nozzle (2) on the floor of the work platform (3), the insertion work of the nozzle (2) is facilitated.
In addition, the nozzle (2) of the reactor vessel (1) of the pressurized water reactor is provided with an even number of 4 to 8, and cutting repair of two or more nozzles (2) can be performed simultaneously. If it is constructed, the construction period can be reduced.

上記切削装置（６）による切削手順を図２、３に基づき簡単に説明する。図２、３中において、Ｈ軸方向に回転させ、第１番目のカッタ（９）を管台（２）内面側にセットする。Ｔ軸方向に回転させながら、Ｋ軸とＸ軸方向に連動させて切削する。同様にして、Ｈ軸方向に回転させカッタ（９）を交換しながら第２〜第４番目の各カッタ（９）で規定幅（溶接部を中心としてその両側部分の適宜幅寸法、例えば１００ｍｍ前後）の切削溝（ア）を切削する。
また、上記ノズル遮蔽体（４）は、その先端にゴムを設けており、主に遮蔽機能を果たすものである。上記部分遮蔽体（５）は開口部（３ａ）と管台（２）間の隙間を埋めること、遮蔽機能、および、各区画を平らにして切削装置（６）の案内を果たすものである。要するに、ノズル遮蔽体（４）および部分遮蔽体（５）よりなる遮蔽体は、空間隙間を塞ぐおよび遮蔽機能を果たすものでよく、両者を一体化してもよい。また、図１などに示す原子力容器１はその上蓋を取外した状態のものである。 The cutting procedure by the cutting device (6) will be briefly described with reference to FIGS. 2 and 3, the first cutter (9) is set on the inner surface side of the nozzle (2) by rotating in the H-axis direction. Cutting is performed in conjunction with the K-axis and X-axis directions while rotating in the T-axis direction. Similarly, while rotating the H-axis direction and exchanging the cutter (9), the second to fourth cutters (9) each have a specified width (appropriate width dimensions of both side portions around the welded portion, for example, around 100 mm. ) Cutting groove (a).
In addition, the nozzle shield (4) is provided with rubber at the tip, and mainly performs a shielding function. The said partial shielding body (5) fills the clearance gap between an opening part (3a) and a nozzle (2), performs a shielding function, makes each division flat, and performs the guide of a cutting device (6). In short, the shielding body composed of the nozzle shielding body (4) and the partial shielding body (5) may serve to close the space gap and perform a shielding function, and may integrate both. Further, the nuclear vessel 1 shown in FIG. 1 and the like is in a state where the upper lid is removed.

本発明の実施例装置を、図３ないし図１０に基づき説明する。
図３は切削装置（６）を管台（２）内に挿入した状態での斜視図である。この切削装置（６）は、切削を行う複数のカッタ（９）を収納すると共にカッタ（９）を囲んで管台（２）の内周面に沿う形状の切粉回収口（７ａ）を備え、切粉を回収するヘッド部（７）と、ヘッド部（７）を管台（２）の内周に沿って軸回動する駆動部を有する胴部（８）と、ヘッド部（７）内の切粉を吸引する切粉回収用ライン（８ａ）とを具えている。
図４は、本実施例に係る出、入口管台内面切削装置（以下切削装置と称する）を用いた作業の概要を示す概念図であり、図４に於いて、原子炉容器（１）の外周方向には内側から貫通する中空円筒状の管台（２）が接続されている。原子炉容器（１）の内部空間に据え付けられた作業架台（３）には、管台（２）の位置に合わせて開口部（３ａ）（図３参照方）が設けられている。
該開口部（３ａ）には中空貫通部を有する円筒状のノズル遮蔽体（４）が挿入されており、さらに該ノズル遮蔽体の内周には中空貫通部を有する部分遮蔽体（５）が挿入されており、当該中空貫通部の内周に挿通して切削装置（６）が、管台（２）の所期の切削位置に適切に位置決めされている。
図５に於いて、切削装置（６）は、切削を行うカッタ（９）（以下、切削刃物と称す）を収納したヘッド部（７）並びに駆動部を収納する胴部（８）で構成されており、該切削装置の外径は、部分遮蔽体（５）の内径より小さく構成されている。
本実施例の場合、ヘッド部（７）には並びに変位検出器用センサ（１０）、渦電流探傷器用センサ（図示していない）を具備し、胴部（８）外周にはクランプ部（１２）並びに車輪（１３）を具備している。胴部（８）は、ケーシング外筒（１４）と、ブシュ（１５）、ブシュ（１６）を介して該ケーシング外筒の内周に対して自転可能な状態で支持された旋回ケーシング（１７）で構成されており、該旋回ケーシング後端に締結された平歯車Ａ（１８）は、ケーシング外筒（１４）内に配置された旋回用モータ（１９）の軸上減速機Ａ（２０）の先端部の平歯車Ｂ（２１）と噛み合っている。 An apparatus according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a perspective view of the cutting device (6) inserted into the nozzle (2). The cutting device (6) includes a plurality of cutters (9) for cutting and includes a chip collection port (7a) having a shape that surrounds the cutter (9) and extends along the inner peripheral surface of the nozzle (2). A head part (7) for collecting chips, a body part (8) having a drive part for pivoting the head part (7) along the inner periphery of the nozzle (2), and a head part (7) And a chip collection line (8a) for sucking the chips inside.
FIG. 4 is a conceptual diagram showing an outline of the operation using the outlet and inlet nozzle inner surface cutting device (hereinafter referred to as a cutting device) according to the present embodiment. In FIG. A hollow cylindrical nozzle (2) penetrating from the inside is connected in the outer peripheral direction. The work platform (3) installed in the internal space of the reactor vessel (1) is provided with an opening (3a) (refer to FIG. 3) according to the position of the nozzle (2).
A cylindrical nozzle shield (4) having a hollow penetrating portion is inserted into the opening (3a), and a partial shield (5) having a hollow penetrating portion is provided on the inner periphery of the nozzle shield. The cutting device (6) is inserted into the inner periphery of the hollow through portion and is appropriately positioned at the intended cutting position of the nozzle (2).
In FIG. 5, the cutting device (6) is composed of a head portion (7) containing a cutter (9) for cutting (hereinafter referred to as a cutting blade) and a body portion (8) containing a drive portion. The outer diameter of the cutting device is smaller than the inner diameter of the partial shield (5).
In the case of the present embodiment, the head portion (7) is provided with a displacement detector sensor (10) and an eddy current flaw detector sensor (not shown), and a clamp portion (12) is provided on the outer periphery of the trunk portion (8). And wheels (13). The trunk portion (8) is supported by the casing outer cylinder (14) and the swivel casing (17) supported by the inner periphery of the casing outer cylinder via the bush (15) and the bush (16) in a rotatable manner. The spur gear A (18) fastened to the rear end of the swivel casing is composed of an on-axis speed reducer A (20) of a swivel motor (19) disposed in the casing outer cylinder (14). It meshes with the spur gear B (21) at the tip.

ケーシング外筒（１４）の後端部には後部板（５１）が締結され、該後部板の外縁の一部は、ケーシング外筒（１４）の外形よりも更に外方に突出して、該突出部分には部分遮蔽体（５）に形成された雌ねじ穴に合わせた位置に固定ボルト（５２）を挿通し得る貫通穴が形成されている。旋回ケーシング（１７）の先端部には、ヘッド部（７）が連結されている。該旋回ケーシングの内部には、切粉回収管（５３）が配置されており、該切粉回収管の後端部は、切粉回収バキュームホース（図示していない）と接続可能な形状に形成されている。
図５、６に於いて、切削を行うヘッド部（７）には、切削刃物（９）の他に変位検出器用センサ（１０）及び、渦電流探傷器用センサ（１１）を具備し、該変位検出器用センサにはシリンダＡ（２２）、該渦電流探傷器用センサにはシリンダＢ（２３）が連結されている。切削刃物（９）の切削作業部位に向けて、切削モニタリング用カメラ（５４）及び、集音マイク（５５）を具備しており、切削油供給ユニット（５６）を具備している。
又、切粉回収ノズル（５７）の一端は、切削刃物（９）を内蔵する空間（５８）に対して開口しており、他の一端は伸縮自在な蛇腹ホース（図示していない）を介して、切粉回収管（図示していない）に接続されている。 A rear plate (51) is fastened to the rear end of the casing outer cylinder (14), and a part of the outer edge of the rear plate protrudes further outward than the outer shape of the casing outer cylinder (14). The part is formed with a through hole through which the fixing bolt (52) can be inserted at a position corresponding to the female screw hole formed in the partial shield (5). A head portion (7) is connected to the tip of the swivel casing (17). A chip recovery pipe (53) is disposed inside the swivel casing, and a rear end portion of the chip recovery pipe is formed in a shape that can be connected to a chip recovery vacuum hose (not shown). Has been.
5 and 6, the head portion (7) for cutting has a displacement detector sensor (10) and an eddy current flaw detector sensor (11) in addition to the cutting blade (9). A cylinder A (22) is connected to the sensor for detector, and a cylinder B (23) is connected to the sensor for eddy current flaw detector. A cutting monitoring camera (54) and a sound collecting microphone (55) are provided toward a cutting work site of the cutting blade (9), and a cutting oil supply unit (56) is provided.
Further, one end of the chip collecting nozzle (57) is open to the space (58) containing the cutting tool (9), and the other end is connected to a telescopic bellows hose (not shown). And connected to a chip collection pipe (not shown).

図７及び図８に於いて、４軸のタレット方式で主軸（２４）に連結された４つの切削刃物（９）は歯幅方向に若干の重複部を持つよう取り付け位置を配置している。主軸（２４）を回転させることにより、個々の切削刃物（９）が、図３の切粉回収口（７ａ）から、管台（２）側に臨み切削が行われる。この４つの切削刃物（９）により、図２の（ａ）に示すリング状の溝（ア）が切削形成される。
主軸（２４）の後端部には軸上減速機Ｂ（２５）を介して切削刃物（９）を回転させる主軸回転モータ（２６）が接続され、該主軸の先端部の歯車Ｃ（２７）は、歯車Ｄ（２８）を介し、４つの歯車Ｅ（２９）と噛み合っている。該歯車Ｅは、其々、長さの異なる４本のスピンドル軸（３０）、（３１）、（３２）、（３３）の一端に連結されており、該スピンドル軸の他の一端には、切削刃物（９）が連結されている。
４本のスピンドル軸を装着したタレット（３４）には、主軸（２４）が貫通できる構造を有した平歯車Ｆ（３５）が連結されており該平歯車Ｆと噛み合った平歯車Ｇ（３６）には軸上減速機Ｃ（３７）を介してタレット（３４）を回転させる刃物交換用モータ（３８）が接続されている。
図９に於いて、切削を行うヘッド部（７）には、軸方向送りボールねじ（３９）の軸端に装着された平歯車Ｈ（４０）と噛み合う平歯車Ｉ（４１）を回転させる軸方向送りモータ（４２）が、軸上減速機Ｄ（４３）を介して配置され、径方向送りボールねじ（４４）の軸端に装着されたマイタギヤ（４５）を介して軸上減速機Ｅ（４６）と径方向送りモータ（４７）が配置されている。
尚、マイタギヤ（４５）と軸上減速機Ｅ（４６）の間には平歯車Ｊ（４８）が装着され、該平歯車Ｊと噛み合うもう一方の平歯車Ｋ（４９）の回転軸後方には六角穴を形成されたスパナ軸（５０）が装着されている。 7 and 8, the four cutting blades (9) connected to the main shaft (24) by the four-axis turret method are arranged at attachment positions so as to have some overlapping portions in the tooth width direction. By rotating the main shaft (24), each cutting blade (9) faces the nozzle (2) side from the chip collection port (7a) of FIG. 3 and performs cutting. With these four cutting blades (9), a ring-shaped groove (a) shown in FIG.
A main shaft rotation motor (26) for rotating the cutting blade (9) is connected to the rear end portion of the main shaft (24) via an on-axis speed reducer B (25), and a gear C (27) at the front end portion of the main shaft. Meshes with four gears E (29) via a gear D (28). The gear E is connected to one end of four spindle shafts (30), (31), (32), (33) having different lengths, and the other end of the spindle shaft is A cutting blade (9) is connected.
A spur gear F (35) having a structure through which the main shaft (24) can pass is connected to the turret (34) to which the four spindle shafts are attached, and a spur gear G (36) meshed with the spur gear F is connected. A blade replacement motor (38) for rotating the turret (34) is connected to the shaft reduction gear C (37).
In FIG. 9, a shaft for rotating a spur gear I (41) that meshes with a spur gear H (40) mounted on the shaft end of an axial feed ball screw (39) is attached to the head portion (7) for cutting. A direction feed motor (42) is arranged via an on-axis speed reducer D (43), and an on-axis speed reducer E (via a miter gear (45) attached to the shaft end of the radial feed ball screw (44). 46) and a radial feed motor (47) are arranged.
A spur gear J (48) is mounted between the miter gear (45) and the on-axis speed reducer E (46), and the other spur gear K (49) meshing with the spur gear J is located behind the rotation shaft. A spanner shaft (50) in which a hexagonal hole is formed is mounted.

本実施例装置は、前述のように構成されているため、原子炉容器（１）に設置された作業架台（３）内部よりアクセスできるように部分遮蔽体（５）の内径よりも、最大外形を小さく構成した切削装置（６）は、車輪（１３）により、装置全体を管台（２）の所定の位置まで容易に挿入・移動することができる。
渦電流探傷器用センサ（１１）によって切削位置を精確に決定でき、変位検出器用センサ（１０）によって内面形状を記録し、このデータを基に管台内面を全周に亘って、一定の深さで切削できる。
切削時の切削反力は、ケーシング外筒（１４）に設けられたクランプ部（１２）で受けることができ、更に後部板（５１）と部分遮蔽体（５）を固定ボルト（５２）により締結、固定することにより、切削装置の全体を管台（２）に対し堅固に保持できる。
切削刃物（９）を含むヘッド部（７）は、ブシュ（１５）、（１６）を介してケーシング外筒（１４）に対して自転できる構造を具備した旋回ケーシング（１７）に連結されているため、旋回用モータ（１９）を駆動することにより管台内面を自動で全周施工することができる。
旋回速度は、軸上減速機Ａ（２０）及び、平歯車Ａ（１８）と平歯車Ｂ（２１）の歯数比により至適状態に設定している。 Since the apparatus according to the present embodiment is configured as described above, the maximum outer shape is larger than the inner diameter of the partial shield (5) so that it can be accessed from the inside of the work platform (3) installed in the reactor vessel (1). The cutting device (6) configured to be small can be easily inserted and moved to a predetermined position of the nozzle (2) by the wheel (13).
The cutting position can be accurately determined by the sensor for eddy current flaw detector (11), and the inner surface shape is recorded by the sensor for displacement detector (10). Can be cut with.
The cutting reaction force at the time of cutting can be received by the clamp part (12) provided in the casing outer cylinder (14), and the rear plate (51) and the partial shield (5) are fastened by the fixing bolt (52). By fixing, the whole cutting device can be firmly held with respect to the nozzle (2).
The head portion (7) including the cutting blade (9) is connected to a swivel casing (17) having a structure capable of rotating with respect to the casing outer cylinder (14) via bushes (15) and (16). Therefore, by driving the turning motor (19), the entire inner surface of the nozzle can be automatically applied.
The turning speed is set to an optimum state by the on-axis reduction gear A (20) and the gear ratio of the spur gear A (18) and the spur gear B (21).

軸方向に若干の重複部を持って、オフセットした４つの切削刃物（９）をタレット（３４）で交換できる構造を有しているため、管台（２）内部に装置を位置決めしたまま、小さい切削負荷で広い幅の切削ができる。
切削油供給ユニット（５６）により、切削部位に切削油を噴射することにより、滑らかな仕上げ面を得ることができる。
切粉回収ノズル（５７）の一端を、切削刃物（９）を内蔵する空間（５８）に対して開口し、他の一端を伸縮自在な蛇腹ホースを介して、切粉回収管（５３）に接続しているため、該切粉回収管に、バキュームホースを接続して切削しながら同時に切粉の回収ができる。
切削刃物（９）の切削作業部位に向けて、切削モニタリング用カメラ（５４）及び、集音マイク（５５）を具備しているため、作業状況を監視できる上に、作業時の異音を把握することにより、不具合の事前把握を容易にしている。
以上述べた本実施例方法および装置は、従来には無かったＰＷＲ型原子力発電所の原子炉容器の出、入口管台内面を切削する方法および装置に関する提案であり、具体的には、管台内部に挿入でき、位置決め機構を具備し、管台内面の全周を一定の深さで切削できる機構を具備した原子炉容器管台の出、入口管台内面切削装置である。 Since it has a structure in which the offset four cutting blades (9) can be replaced with the turret (34) with a slight overlap in the axial direction, the device remains small while the apparatus is positioned inside the nozzle (2). A wide width can be cut with a cutting load.
A smooth finished surface can be obtained by spraying the cutting oil onto the cutting site by the cutting oil supply unit (56).
One end of the chip collection nozzle (57) is opened to the space (58) containing the cutting blade (9), and the other end is connected to the chip collection pipe (53) via an elastic bellows hose. Since it is connected, it is possible to collect chips simultaneously while cutting by connecting a vacuum hose to the chip collection pipe.
A cutting monitoring camera (54) and a sound collection microphone (55) are provided toward the cutting work part of the cutting blade (9), so that the work status can be monitored and abnormal noise during work can be grasped. By doing so, it is easy to grasp in advance the trouble.
The method and apparatus of the present embodiment described above are proposals relating to a method and apparatus for cutting the exit of the reactor vessel of the PWR type nuclear power plant and the inner surface of the inlet nozzle, which have not been heretofore. This is a reactor vessel nozzle internal surface cutting device that can be inserted inside, has a positioning mechanism, and has a mechanism that can cut the entire circumference of the internal surface of the nozzle base at a constant depth.

本発明は上記実施例に限定されるものではなく必要に応じ、適宜設計変更し得るものである。また、上記実施例における各構成要素には、当業者が容易に想定できるものや、実質的に同一のものが含まれる。   The present invention is not limited to the above-described embodiments, and can be appropriately modified as necessary. In addition, each component in the embodiment includes those that can be easily assumed by those skilled in the art and those that are substantially the same.

本実施例に係る原子力容器に架台を設置した状態を示す断面図である。It is sectional drawing which shows the state which installed the mount frame in the nuclear reactor which concerns on a present Example. （ａ）は図１のＡ部の内面切削時の拡大説明図、（ｂ）はクラッディング時の拡大説明図、（ｃ）は内面仕上げ時の拡大説明図である。(A) is an enlarged explanatory view at the time of inner surface cutting of A part of FIG. 1, (b) is an enlarged explanatory view at the time of cladding, (c) is an enlarged explanatory view at the time of inner surface finishing. 本実施例の管台内に切削装置を挿入した状態を示す斜視図である。It is a perspective view which shows the state which inserted the cutting device in the nozzle of a present Example. 本実施例の管台内に切削装置を設置した状態の作業概念図である。It is an operation | work conceptual diagram of the state which installed the cutting device in the nozzle of a present Example. 本実施例の切削装置の断面図である。It is sectional drawing of the cutting device of a present Example. 図５のＰ−Ｐ矢視図である。It is a PP arrow line view of FIG. 図６のＱ−Ｑ矢視図である。It is a QQ arrow line view of FIG. 図７のＲ−Ｒ矢視図である。It is the RR arrow line view of FIG. 図６のＳ−Ｓ矢視図である。FIG. 7 is a view taken along the line S-S in FIG. 6. 図６のＴ−Ｔ矢視図である。It is a TT arrow line view of FIG.

符号の説明Explanation of symbols

１ 原子炉容器
２ 管台
２ａ 出、入口管
３ 作業架台（架台）
３ａ 開口部
４ ノズル遮蔽体
５ 部分遮蔽体
６ 切削装置
７ ヘッド部
８ 胴部
８ａ 切粉回収用ライン
９ カッタ（切削刃物）
ｍ 溶接部
1 Reactor vessel 2 Tubing 2a Out, entrance pipe 3 Work platform (mounting platform)
3a Opening 4 Nozzle shield 5 Partial shield 6 Cutting device 7 Head 8 Body 8a Chip collection line 9 Cutter (cutting blade)
m Welded part

Claims (4)

原子炉容器の側面に設けられている管台と、同管台に接続されている出、入口管との内周の溶接部を切削する原子力容器の管台内面の切削方法において、少なくとも管台の下方位置まで冷却水を排水した状態の原子力容器内に、管台の位置に合わせた開口部を側面に有す架台を設置し、次に、前記開口部から管台内に円筒状の遮蔽体を挿入設置した後、管台内に切削装置を挿入して前記溶接部を切削することを特徴とする原子力容器の管台内面の切削方法。   In a method of cutting the inner surface of a nozzle base of a nuclear vessel that cuts a welded portion provided on a side surface of a nuclear reactor vessel and a welded portion connected to the same, and an inner periphery of the inlet tube, In the nuclear vessel where the cooling water has been drained down to the position below, a frame having an opening on the side face corresponding to the position of the nozzle is installed, and then a cylindrical shield from the opening to the nozzle A method for cutting an inner surface of a nozzle base of a nuclear vessel, wherein a cutting device is inserted into the nozzle and the weld is cut after the body is inserted and installed. 前記切削装置は切粉回収ノズルを装備しており、常時切粉を回収しながら切削を行うことを特徴とする請求項１に記載の原子力容器の管台内面の切削方法。   The said cutting device is equipped with the chip collection | recovery nozzle, and it cuts, always collecting chips, The cutting method of the nozzle inner surface of the nuclear vessel of Claim 1 characterized by the above-mentioned. 前記請求項１又は請求項２に記載の切削方法により前記溶接部の内周を切削した後、切削部に所定の溶接肉盛りを施工し、次に、前記切削装置により仕上げ切削を行うことを特徴とする原子力容器の管台内面の切削方法。   After cutting the inner periphery of the welded portion by the cutting method according to claim 1 or 2, a predetermined weld overlay is applied to the cut portion, and then finish cutting is performed by the cutting device. A method for cutting the inner surface of a nozzle of a nuclear vessel. 原子炉容器の側面に設けられている管台と、同管台に接続されている出、入口管との内周の溶接部を切削する原子力容器の管台内面の切削装置において、切削を行うカッタを収納すると共にカッタを囲んで管台内周面に沿う切粉回収ノズルを具えるヘッド部と、前記ヘッド部を管台内周に沿って軸回動する駆動部を有する胴部と、前記ヘッド部内の切粉を吸引する切粉回収用ラインとを具えたことを特徴とする原子炉容器の管台内面の切削装置。   Cutting is performed in a nozzle provided on the side surface of the reactor vessel, and a cutting device on the inner surface of the nozzle of the nuclear vessel that cuts the welded portion connected to the nozzle and the inner periphery of the inlet pipe. A head portion that houses the cutter and surrounds the cutter and includes a chip collection nozzle along the inner peripheral surface of the nozzle, and a body portion that has a driving portion that pivots the head portion along the inner periphery of the nozzle; A cutting device for an inner surface of a nozzle of a nuclear reactor vessel, comprising a chip collection line for sucking chips in the head portion.
JP2005178826A 2005-06-20 2005-06-20 Method and apparatus for cutting inner surface of nozzle of nuclear vessel Active JP4444168B2 (en)

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