JP2810066B2 - Repair method of neutron flux monitor housing - Google Patents
Repair method of neutron flux monitor housingInfo
- Publication number
- JP2810066B2 JP2810066B2 JP63249868A JP24986888A JP2810066B2 JP 2810066 B2 JP2810066 B2 JP 2810066B2 JP 63249868 A JP63249868 A JP 63249868A JP 24986888 A JP24986888 A JP 24986888A JP 2810066 B2 JP2810066 B2 JP 2810066B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- neutron flux
- icm housing
- housing
- monitor housing
- 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 - Fee Related
Links
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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、原子炉発電プラントの供用期間中における
原子炉圧力容器（以下RPVという）内の中性子束モニタ
ハウジング（以下、ICMハウジングという）の補修方法
に係り、特に比較的容易に行えるICMハウジングの補修
方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a neutron flux monitor housing (hereinafter referred to as an ICM housing) in a reactor pressure vessel (hereinafter referred to as an RPV) during a service period of a nuclear power plant. The present invention relates to a repair method, and particularly to a repair method for an ICM housing that can be relatively easily performed.
沸騰水型原子炉のRPVのICMハウジングは第５図に示す
ような構造とされている。即ちインコネル材等により肉
盛り溶接が施されたRPV下鏡1Dに貫通孔1Aが設けられる
と共に、この貫通孔1Aと連通するように溶接肉盛座２が
取付けられている。この溶接肉盛座２にRPV下鏡1Dの壁
を貫通してICMハウジング３が溶接部４を介して溶着さ
れている。The ICM housing of the RPV of the boiling water reactor has a structure as shown in FIG. That is, the through hole 1A is provided in the RPV lower mirror 1D which has been overlaid with an inconel material or the like, and the weld overlay 2 is attached so as to communicate with the through hole 1A. An ICM housing 3 is welded to the weld overlay 2 through a weld 4 so as to penetrate the wall of the RPV lower mirror 1D.
従来型の沸騰水型原子炉のICMハウジング３はSUS304
系の鋼管を使用しており、ICMハウジング３の溶接部４
近傍に、万一、貫通き裂4Aが発生し漏洩する可能性があ
る場合を想定して、ICMハウジング３の補修方法をあら
かじめ確立しておく必要がある。The conventional boiling water reactor ICM housing 3 is SUS304
Welded part 4 of ICM housing 3
It is necessary to establish a repair method for the ICM housing 3 in advance, assuming that there is a possibility that a through crack 4A may occur and leak in the vicinity.
本発明の目的は、ICMハウジングの補修が容易に行
え、作業員の被曝を極力押えることができるICMハウジ
ングの補修方法を提供することにある。An object of the present invention is to provide a method for repairing an ICM housing that can easily repair the ICM housing and minimize exposure of workers.
上記目的を達成するために、本発明は、原子炉圧力容
器の内面に取付けられた円筒状の溶接肉盛座内に前記原
子炉圧力容器の壁を貫通して挿入され、前記溶接肉盛座
と溶接部で結合された円筒状の中性子束モニタ（ICM）
ハウジングの補修方法であって、前記ICMハウジングの
内面に肉厚が薄い円筒状のスリーブを挿入し、円筒状の
スリーブ挿入治具を用いて前記スリーブを補修対象箇所
まで移動させ、前記スリーブ挿入治具内を通して遠隔操
作式の自動溶接機を挿入し、該自動溶接機を用いて前記
ICMハウジングの内面と前記スリーブの上端を溶接固定
し、その後、前記自動溶接機を降下させ、該自動溶接機
を用いて前記ICMハウジングの内面と前記スリーブの下
端を溶接固定する。In order to achieve the above object, the present invention relates to a welding pressure welder, which is inserted through a wall of the reactor pressure vessel into a cylindrical weld overlay mounted on an inner surface of the reactor pressure vessel, Neutron flux monitor (ICM) that is connected to the welding part
A method of repairing a housing, comprising inserting a thin-walled cylindrical sleeve into the inner surface of the ICM housing, moving the sleeve to a repair target using a cylindrical sleeve insertion jig, Insert a remote-controlled automatic welding machine through the tool and use the automatic welding machine to
The inner surface of the ICM housing and the upper end of the sleeve are fixed by welding, and then the automatic welding machine is lowered, and the inner surface of the ICM housing and the lower end of the sleeve are fixed by welding using the automatic welding machine.
本発明によれば、ICMハウジングに貫通亀裂が発生し
た場合でも、スリーブ挿入治具を用いて薄肉の円筒状の
スリーブを貫通亀裂をカバーする補修対象箇所まで移動
させることにより、容易にスリーブの位置決めができ
る。また、スリーブ挿入治具内を通して遠隔操作式の自
動溶接機を挿入しこれを用いてICMハウジングの内面と
スリーブの両端を容易に溶接固定できる。従って、補修
作業が容易に行え、貫通亀裂からの漏水を比較的簡単に
防止できる。また、これに伴う作業員の被曝を極力抑え
ることができる。According to the present invention, even when a through crack occurs in the ICM housing, the sleeve can be easily positioned by moving the thin cylindrical sleeve to the repair target portion covering the through crack using the sleeve insertion jig. Can be. In addition, a remote-operated automatic welding machine is inserted through the sleeve insertion jig, and this can be used to easily weld and fix the inner surface of the ICM housing and both ends of the sleeve. Therefore, repair work can be easily performed, and water leakage from the through crack can be relatively easily prevented. In addition, it is possible to minimize the exposure of the worker due to this.
以下、本発明の実施例を第１図〜第５図により説明す
る。Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
第４図は、沸騰水型原子炉のRPVを示す。RPV1はRPV胴
体1C、RPV下鏡1DおよびRPV上蓋（図示せず）から構成さ
れている。RPV1はスカート５によつて原子炉格納容器の
ペデスタル（図示せず）上に固設されている。ICMハウ
ジング３は前記RPV下鏡1Dに固設されている。FIG. 4 shows an RPV of a boiling water reactor. The RPV 1 includes an RPV body 1C, an RPV lower mirror 1D, and an RPV upper lid (not shown). The RPV 1 is fixed on a pedestal (not shown) of the containment vessel by a skirt 5. The ICM housing 3 is fixed to the RPV lower mirror 1D.
第５図は、ICMハウジング３がRPV下鏡1Dに固設された
状態の断面図を示す。RPV下鏡1Dの内面にはインコネル
の肉盛部1Bが形成されており、この肉盛部1B上に溶接肉
盛座２が肉盛溶接されている。前記ICMハウジング３は
前記RPV下鏡1Dを貫通して前記溶接肉盛座２に溶接部４
によつて固設されている。FIG. 5 is a sectional view showing a state where the ICM housing 3 is fixed to the lower RPV mirror 1D. On the inner surface of the RPV lower mirror 1D, an overlay layer 1B of Inconel is formed, and a weld overlay 2 is overlay welded on the overlay section 1B. The ICM housing 3 penetrates through the RPV lower mirror 1D and is welded to the weld overlay 2 by a weld 4
Is fixed.
前記溶接部４近傍の、ICMハウジング３に万一、貫通
き裂4Aが生じた場合、冷却材の漏洩する漏洩経路12が想
定される。In the event that a through crack 4A occurs in the ICM housing 3 near the weld 4, the leakage path 12 through which the coolant leaks is assumed.
第１図は、本発明の一実施例を示す補修後のICMハウ
ジング３の断面図である。また、第２図〜第３図は本発
明の一実施例によるICMハウジング３の補修方法の手順
を示す。まず第２図に示すように、補修対象となるICM
ハウジング３下端より、円筒スリーブ９を挿入し、さら
にスリーブ挿入治具７により、ICMハウジング３内の補
修対象箇所まで案内させる。さらに、スリーブ挿入治具
７内を通して遠隔操作式自動溶接機６を挿入し、円筒ス
リーブ９、補修対象箇所との位置決めを行い、円筒スリ
ーブ９上端を前記遠隔操作式自動溶接機６により、前記
ICMハウジング３内壁に、円筒スリーブ９を溶接により
固定し、溶接部10を形成する。FIG. 1 is a cross-sectional view of an ICM housing 3 after repair, showing one embodiment of the present invention. 2 and 3 show a procedure of a method for repairing the ICM housing 3 according to one embodiment of the present invention. First, as shown in Fig. 2, the ICM to be repaired
A cylindrical sleeve 9 is inserted from the lower end of the housing 3, and further guided by a sleeve insertion jig 7 to a repair target position in the ICM housing 3. Furthermore, the remote-controlled automatic welding machine 6 is inserted through the sleeve insertion jig 7 to position the cylindrical sleeve 9 and the repair target portion.
The cylindrical sleeve 9 is fixed to the inner wall of the ICM housing 3 by welding to form a welded portion 10.
次に第３図に示すように、前記遠隔操作式自動溶接機
６を降下させ、前記円筒スリーブ９下端の溶接部11を溶
接し、ICMハウジング３内面に固設させる。このように
してICMハウジング３に万一、貫通き裂4Aが発生し、RPV
1内の冷却材が、ICMハウジング３の貫通き裂4Aから、PR
V貫通孔1AとICMハウジング３のすき間を通して漏洩する
可能性が生じた場合でも比較的簡単に漏洩を防止し、そ
して作業者の被曝を極力押えたICMハウジング３の補修
が可能である。Next, as shown in FIG. 3, the remote-controlled automatic welding machine 6 is lowered, and the welded portion 11 at the lower end of the cylindrical sleeve 9 is welded and fixed to the inner surface of the ICM housing 3. In this way, a through crack 4A is generated in the ICM housing 3 and the RPV
The coolant inside 1 is from PR through through crack 4A of ICM housing 3.
Even if there is a possibility of leakage through the gap between the V through hole 1A and the ICM housing 3, the leakage can be relatively easily prevented, and the ICM housing 3 can be repaired while minimizing the exposure of the worker.
また、遠隔操作によるICMハウジングの補修が可能で
あるため、複雑なRPV下鏡部のICMハウジング群中に接近
する必要もないので、これも作業の容易化及び作業員の
被曝抑制に寄与する。In addition, since the ICM housing can be repaired by remote control, there is no need to approach the ICM housing group of the complicated RPV lower mirror section, which also contributes to simplification of work and suppression of exposure of workers.
本発明によれば、スリーブ挿入治具を用いて容易にス
リーブの位置決めができると共に、遠隔操作式の自動溶
接機を用いてICMハウジングの内面とスリーブの両端を
容易に溶接固定できるので、ICMハウジングの補修作業
が容易に行え、貫通亀裂からの漏水を比較的簡単に防止
できる。また、これに伴う作業員の被曝を極力抑えるこ
ともできる。According to the present invention, the sleeve can be easily positioned by using the sleeve insertion jig, and the inner surface of the ICM housing and both ends of the sleeve can be easily welded and fixed by using a remote-controlled automatic welding machine. Repair work can be performed easily, and water leakage from through cracks can be prevented relatively easily. In addition, it is possible to minimize the exposure of the workers involved.
第１図は本発明の一実施例による補修後のICMハウジン
グ部を示す断面図である。第２図から第３図までは第１
図における補修手順を示し、第２図は円筒スリーブ挿入
後の円筒スリーブ上部の溶接状況を示すICMハウジング
部の断面図、第３図は円筒スリーブ下部の溶接状況を示
すICMハウジング部の断面図である。第４図は本発明の
補修方法の概要説明用のICMハウジング部の断面図であ
る。第５図は補修前のRPV下部構造の説明用断面図であ
る。 １……原子炉圧力容器、1A……貫通孔、1B……肉盛、1C
……RPV胴体、1D……RPV下鏡、２……溶接肉盛座、３…
…ICMハウジング、４……溶接部、4A……貫通き裂、５
……スカート、６……遠隔操作式自動溶接機、７……ス
リーブ挿入治具、８……中性子束モニタ案内管、９……
円筒スリーブ、10……溶接部、11……溶接部、12……漏
洩経路。FIG. 1 is a sectional view showing an ICM housing portion after repair according to an embodiment of the present invention. 2 to 3 are the first
FIG. 2 is a cross-sectional view of the ICM housing part showing the welding state of the upper part of the cylindrical sleeve after insertion of the cylindrical sleeve, and FIG. 3 is a cross-sectional view of the ICM housing part showing the welding state of the lower part of the cylindrical sleeve. is there. FIG. 4 is a cross-sectional view of an ICM housing part for explaining the outline of the repair method of the present invention. FIG. 5 is an explanatory cross-sectional view of the RPV lower structure before repair. 1 ... Reactor pressure vessel, 1A ... Through hole, 1B ... Overlay, 1C
... RPV fuselage, 1D ... RPV lower mirror, 2 ... weld overlay, 3 ...
... ICM housing, 4 ... weld, 4A ... through crack, 5
… Skirt, 6… remote control type automatic welding machine, 7… sleeve insertion jig, 8… neutron flux monitor guide tube, 9…
Cylindrical sleeve, 10… weld, 11… weld, 12… Leakage path.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤本 弘次 茨城県日立市幸町３丁目１番１号 株式 会社日立製作所日立工場内 (56)参考文献 特開 昭63−45593（ＪＰ，Ａ) 特公 昭62−29673（ＪＰ，Ｂ２) ──────────────────────────────────────────────────の Continuation of the front page (72) Koji Fujimoto, Inventor Hitachi 3-1-1, Sachimachi, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (56) References 62-29673 (JP, B2)
Claims (1)
状の溶接肉盛座内に前記原子炉圧力容器の壁を貫通して
挿入され、前記溶接肉盛座と溶接部で結合された円筒状
の中性子束モニタハウジングの補修方法であって、 前記中性子束モニタハウジングの内面に肉厚が薄い円筒
状のスリーブを挿入し、円筒状のスリーブ挿入治具を用
いて前記スリーブを補修対象箇所まで移動させ、前記ス
リーブ挿入治具内を通して遠隔操作式の自動溶接機を挿
入し、該自動溶接機を用いて前記中性子束モニタハウジ
ングの内面と前記スリーブの上端を溶接固定し、 その後、前記自動溶接機を降下させ、該自動溶接機を用
いて前記中性子束モニタハウジングの内面と前記スリー
ブの下端を溶接固定することを特徴とする中性子束モニ
タハウジングの補修方法。1. A reactor pressure vessel is inserted through a wall of the reactor pressure vessel into a cylindrical weld overlay mounted on an inner surface of the reactor pressure vessel, and connected to the weld overlay by a weld. A method for repairing a cylindrical neutron flux monitor housing, wherein a thin cylindrical sleeve is inserted into an inner surface of the neutron flux monitor housing, and the sleeve is repaired using a cylindrical sleeve insertion jig. To insert a remote-controlled automatic welding machine through the sleeve insertion jig, and use the automatic welding machine to weld and fix the inner surface of the neutron flux monitor housing and the upper end of the sleeve. A method for repairing a neutron flux monitor housing, comprising lowering a welding machine and welding and fixing an inner surface of the neutron flux monitor housing and a lower end of the sleeve using the automatic welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249868A JP2810066B2 (en) | 1988-10-05 | 1988-10-05 | Repair method of neutron flux monitor housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249868A JP2810066B2 (en) | 1988-10-05 | 1988-10-05 | Repair method of neutron flux monitor housing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0298695A JPH0298695A (en) | 1990-04-11 |
| JP2810066B2 true JP2810066B2 (en) | 1998-10-15 |
Family
ID=17199386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63249868A Expired - Fee Related JP2810066B2 (en) | 1988-10-05 | 1988-10-05 | Repair method of neutron flux monitor housing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2810066B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2519316B2 (en) * | 1989-02-10 | 1996-07-31 | 株式会社東芝 | Repair method for long housing and repair structure |
| JP2581605B2 (en) * | 1990-05-24 | 1997-02-12 | 株式会社日立製作所 | Heat treatment device for neutron flux monitor housing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6229673A (en) * | 1985-07-31 | 1987-02-07 | 三井建設株式会社 | Construction of reinforced concrete pillar |
| JPS6345593A (en) * | 1986-08-13 | 1988-02-26 | 株式会社日立製作所 | Neutron flux monitor housing |
-
1988
- 1988-10-05 JP JP63249868A patent/JP2810066B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0298695A (en) | 1990-04-11 |
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