JPH07102454B2 - Welding structure for pressure vessel piping - Google Patents
Welding structure for pressure vessel pipingInfo
- Publication number
- JPH07102454B2 JPH07102454B2 JP21343286A JP21343286A JPH07102454B2 JP H07102454 B2 JPH07102454 B2 JP H07102454B2 JP 21343286 A JP21343286 A JP 21343286A JP 21343286 A JP21343286 A JP 21343286A JP H07102454 B2 JPH07102454 B2 JP H07102454B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure vessel
- pipe
- welding
- outside
- corrosion
- 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
- 238000003466 welding Methods 0.000 title claims description 28
- 230000007797 corrosion Effects 0.000 claims description 31
- 238000005260 corrosion Methods 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000000956 alloy Substances 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000010955 niobium Substances 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 7
- 238000011105 stabilization Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 230000001066 destructive effect Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、圧力容器の配管溶接構造、特に原子力プラン
トの圧力容器の配管溶接構造に関する。TECHNICAL FIELD The present invention relates to a pipe welding structure for a pressure vessel, and more particularly to a pipe welding structure for a pressure vessel of a nuclear power plant.
原子力プラントの圧力容器１には、第２図に示す如く、
圧力容器１の外側と内側とを貫いて貫通配管２が設けら
れている。In the pressure vessel 1 of the nuclear power plant, as shown in FIG.
A penetrating pipe 2 is provided so as to penetrate the pressure vessel 1 from the outside and the inside.
従来、圧力容器１に短管４を介して貫通配管２を取付け
る場合、第３図に示すように、まず圧力容器１の内面に
耐食性金属の肉盛溶接部３を設け、次いで、圧力容器１
に貫通配管２を通すための穴を設け、その穴の上に短管
４を圧力容器１の内側から設定し、圧力容器１と短管４
とをシール溶接を行って溶接部５を設け、そして、短管
４の中に貫通配管２を挿入して、短管４と貫通配管２と
をシール溶接を行って溶接部６を設けた。Conventionally, when the through pipe 2 is attached to the pressure vessel 1 via the short pipe 4, first, as shown in FIG. 3, a build-up welded portion 3 of a corrosion resistant metal is provided on the inner surface of the pressure vessel 1 and then the pressure vessel 1
A hole for passing the through pipe 2 is provided in the pressure vessel 1, and the short pipe 4 is set on the hole from the inside of the pressure vessel 1.
Were welded to each other by seal welding, and the through pipe 2 was inserted into the short pipe 4, and the short pipe 4 and the through pipe 2 were seal welded to provide the welded part 6.
しかし、従来の配管溶接構造では、原子力プラントの運
転開始後、定期点検時等において前記の配管溶接構造部
分について非破壊検査を行う場合を作業性と、短管４ま
たは貫通配管２の改修を必要とする場合の作業性とにつ
いては、ほとんど考慮されていない。すなわち、原子力
プラントは一旦運転が開始されると、圧力容器１の内部
は高度に放射能化されるため、短管４や貫通配管２の溶
接部５及び６について、応力腐食割れなどの損傷の有無
を調査するには、圧力容器１の上蓋７を取外して炉内構
造物８を取出し、しかる後、遠隔操作によるカメラ又は
超音波深傷センサーを圧力容器１の底部にまで挿入して
検査を行う必要がある。However, in the conventional pipe welding structure, it is necessary to improve the workability and the repair of the short pipe 4 or the through pipe 2 when the non-destructive inspection is performed on the pipe welding structure portion at the time of periodic inspection after the operation of the nuclear power plant is started. There is almost no consideration given to workability in the case of. That is, once the operation of the nuclear power plant is started, the inside of the pressure vessel 1 is highly activated, so that the welded portions 5 and 6 of the short pipe 4 and the through pipe 2 are not damaged by stress corrosion cracking or the like. In order to investigate the presence or absence, the upper lid 7 of the pressure vessel 1 is removed and the reactor internal structure 8 is taken out, and then a camera or an ultrasonic deep scratch sensor by remote control is inserted up to the bottom of the pressure vessel 1 for inspection. There is a need to do.
上記の溶接部５又は６に応力腐食割れなどの損傷が発見
された場合には、やはり、圧力容器１の上方から遠隔操
作で改修工事を行う必要がある。When damage such as stress corrosion cracking is found in the welded portion 5 or 6, it is still necessary to perform repair work by remote control from above the pressure vessel 1.
このような作業を実施すれば、少なくとも２年は要する
と考えられ、原子力プラントの稼動率を著しく低下させ
ることになり、実質的には施工は不可能と考えられる。If such work is carried out, it will take at least two years, which will significantly reduce the operating rate of the nuclear power plant, and it is considered that construction is virtually impossible.
上記従来技術では、特に原子力プラントの圧力容器１の
内側から短管４及び貫通配管２を溶接により取付ける配
管溶接構造であるため、原子力プラントの運転開始後、
短管４及び貫通配管２の夫々の溶接部5,6について、応
力腐食割れ等の損傷の有無調査のために非破壊検査を行
う場合の作業や、損傷が発見されて改修工事を必要とす
る場合の作業を、高度に放射能化された圧力容器１の内
側から行う必要が生じ、これら作業が極めて困難になる
という問題があった。In the above-mentioned conventional technology, in particular, since the short pipe 4 and the penetrating pipe 2 are attached by welding from the inside of the pressure vessel 1 of the nuclear power plant, after the operation of the nuclear power plant is started,
The welded parts 5 and 6 of the short pipe 4 and the through pipe 2 require non-destructive inspection to check for damage such as stress corrosion cracking, and repair work when damage is found. In this case, it is necessary to carry out the work from the inside of the highly radioactive pressure vessel 1, and there is a problem that these works become extremely difficult.
本発明の目的は、この問題を解除した、これら作業を圧
力容器１の内側から行う必要のない圧力容器の配管溶接
構造を提供することにある。It is an object of the present invention to provide a pipe welding structure for a pressure vessel which solves this problem and which does not require these operations to be performed from the inside of the pressure vessel 1.
上記目的は、原子力プラントの圧力容器の外側と内側と
を貫いて設けられる貫通配管が、前記圧力容器に短管を
介して溶接される圧力容器の配管溶接構造において、前
記圧力容器に設けられた穴の内側と、前記圧力容器の外
側の穴周辺部の全面に、予め耐食性金属の肉盛溶接部が
設けられ、次いで、前記穴に耐食性金属からなる短管が
挿入され、該短管と前記圧力容器とが該圧力容器の外側
でシール溶接により取付けられた後、前記短管内に耐食
性金属からなる前記貫通配管が挿入され、該貫通配管と
前記短管とが前記圧力容器の外側でシール溶接により取
付けられる構造であることを特徴とする圧力容器の配管
溶接構造を提供することにより達成される。The above-mentioned object is, in the pipe welding structure of the pressure vessel in which the through pipe provided through the outside and the inside of the pressure vessel of the nuclear power plant is welded to the pressure vessel via the short pipe, is provided in the pressure vessel. Inside of the hole and on the entire periphery of the hole outside the pressure vessel, a build-up weld of corrosion-resistant metal is provided in advance, then a short pipe made of corrosion-resistant metal is inserted into the hole, and the short pipe and the After the pressure vessel is attached by seal welding on the outside of the pressure vessel, the penetrating pipe made of a corrosion-resistant metal is inserted into the short pipe, and the penetrating pipe and the short pipe are seal welded on the outer side of the pressure container. It is achieved by providing a pipe welding structure for a pressure vessel, which is characterized in that
原子力プラントの圧力容器１と短管４との溶接部９と、
短管４と貫通配管２との溶接部10とを、圧力容器１の外
側に設けることにより、これら溶接部9,10について、応
力腐食割れ等の損傷の有無調査のための非破壊検査を行
う場合の作業や、損傷が発見されて改修工事を必要とす
る場合の作業を、圧力容器１の外側から行うことを可能
にした。A welded portion 9 of the pressure vessel 1 of the nuclear power plant and the short pipe 4,
By providing the welded portion 10 of the short pipe 4 and the through pipe 2 on the outside of the pressure vessel 1, the welded portions 9 and 10 are subjected to nondestructive inspection for investigating the presence or absence of damage such as stress corrosion cracking. The work in the case and the work in which the damage is found and the repair work is required can be performed from the outside of the pressure vessel 1.
また、圧力容器１の前記穴の内面に設けられた耐食性金
属の肉盛溶接部７は、前記穴と短管４との間で形成する
隙間の中へ、圧力容器内の酸素を含有する高温水が侵入
して前記穴の内面を腐食させることを防止する。Further, the build-up welded portion 7 of the corrosion-resistant metal provided on the inner surface of the hole of the pressure vessel 1 has a high temperature containing oxygen in the pressure vessel in the gap formed between the hole and the short pipe 4. It prevents water from entering and corroding the inner surface of the hole.
そして、圧力容器１の前記穴の外側周辺に設けられた耐
食性金属の肉盛溶接部８は、圧力容器１と短管４との溶
接を圧力容器１の外側で行う場合に、その溶接部９の溶
接品質を安定化させる。The build-up welded portion 8 of the corrosion-resistant metal provided around the outside of the hole of the pressure vessel 1 has a welded portion 9 when the pressure vessel 1 and the short pipe 4 are welded outside the pressure vessel 1. Stabilize the welding quality of.
本発明の実施例について、図表により説明する。第１図
は、本発明となる圧力容器１と、短管４と、貫通配管２
とで構成された配管溶接構造を示す。低合金鋼よりなる
圧力容器１の内面には溶接により耐食性金属の肉盛溶接
部３が設けられ、圧力容器１に貫通配管２を通すために
設けられた前記穴の内面にも、溶接により同様に耐食性
金属の肉盛溶接部７が設けられる。さらに、圧力容器１
の外側の前記穴周辺にも耐食性金属の肉盛溶接部８が設
けられる。Examples of the present invention will be described with reference to the drawings. FIG. 1 shows a pressure vessel 1 according to the present invention, a short pipe 4, and a through pipe 2.
The pipe welding structure constituted by and is shown. The pressure vessel 1 made of low alloy steel is provided with a weld-on welded portion 3 of a corrosion-resistant metal on the inner surface thereof, and the inner surface of the hole provided for passing the through pipe 2 into the pressure vessel 1 is also welded. A build-up weld 7 of corrosion-resistant metal is provided on the. Furthermore, the pressure vessel 1
A build-up weld 8 of corrosion-resistant metal is also provided around the hole on the outside of the.
耐食性金属の肉盛溶接部3,7及び８は、全てニッケル基
合金あるいはステンレス鋼の溶接金属とする。ニッケル
基合金の溶接金属の場合、特開昭57−25300号公報に記
載の如く、溶接金属の安定化パラメーターが７以上の
高耐食性ニッケル基合金とする（＝0.13×（Nb＋2T
i）/C;Nb,Ti,Cは重量％を示す）。The build-up welds 3, 7 and 8 of the corrosion-resistant metal are all nickel-base alloy or stainless steel weld metal. In the case of a nickel-base alloy weld metal, as described in JP-A-57-25300, a high corrosion-resistant nickel-base alloy having a stabilization parameter of the weld metal of 7 or more (= 0.13 × (Nb + 2T
i) / C; Nb, Ti, C represent% by weight).
次に短管４を前記穴に挿入し、圧力容器１の外側でシー
ル溶接を行い、溶接部９を設ける。Next, the short pipe 4 is inserted into the hole, and seal welding is performed on the outside of the pressure vessel 1 to provide a welded portion 9.
前記短管４は、特願昭57−166833号、 特願昭57−166834号、 特願昭57−166835号、 特願昭60−14623号公報記載のニオブ含有の高耐食性ニ
ッケル基合金からなり、溶接部９は溶接金属の安定化パ
ラメーターが７以上の高耐食性ニッケル基合金からな
る。The short pipe 4 is made of a niobium-containing highly corrosion-resistant nickel-based alloy described in Japanese Patent Application No. 57-166833, Japanese Patent Application No. 57-166834, Japanese Patent Application No. 57-166835, and Japanese Patent Application No. 60-14623. The welded portion 9 is made of a highly corrosion-resistant nickel-based alloy having a weld metal stabilization parameter of 7 or more.
しかる後、短管４に貫通配管２を挿入し、圧力容器１の
外側で両管をシール溶接により溶接部10を設ける。貫通
配管２は上記のニオブ含有の高耐食性ニッケル基合金、
ないしは、例えばSUS316LCや遠心鋳造管CF−3Mの如きス
テンレス鋼からなる。溶接部10は溶接金属の安定化パラ
メーターが７以上の高耐食性ニッケル基合金からな
る。After that, the through pipe 2 is inserted into the short pipe 4, and the welded portion 10 is provided outside the pressure vessel 1 by seal welding the both pipes. The through pipe 2 is made of the above-mentioned niobium-containing highly corrosion-resistant nickel-based alloy,
Or, it is made of stainless steel such as SUS316LC or CF-3M centrifugal casting pipe. The weld 10 is made of a highly corrosion-resistant nickel-base alloy having a weld metal stabilization parameter of 7 or more.
上記の如く、本発明の実施例において、圧力容器１に設
けた耐食性金属の肉盛溶接部3,7及び８と、短管４、貫
通配管２夫々の溶接部９及び10とを、溶接金属の安定化
パラメーターが７以上の高耐食性ニッケル基合金に規
定したこと、そして、短管４の材料をニオブが含有のニ
ッケル基合金もしくはステンレス鋼に規定したことはす
べて、圧力容器内の酸素を含む高温水に対し、耐応力腐
食割れ性を保有する必要があるためである。As described above, in the embodiment of the present invention, the welded weld portions 3, 7 and 8 of the corrosion resistant metal provided in the pressure vessel 1 and the welded portions 9 and 10 of the short pipe 4 and the through pipe 2 are welded to each other. The stabilization parameters of the above are specified to be a high corrosion resistance nickel-base alloy of 7 or more, and the material of the short tube 4 is specified to be a nickel-base alloy containing niobium or stainless steel. This is because it is necessary to have stress corrosion cracking resistance against high temperature water.
4.発明の効果 本発明によれば、原子力プラントの圧力容器１と短管４
との溶接部９、及び短管４と貫通配管２との溶接部10
が、圧力容器１の外側に設けられているので、これらの
溶接部周辺に応力腐食割れなどの損傷の有無を調査する
非破壊検査を行う場合の作業を、圧力容器の外側から実
施でき、かつ、また、これらの溶接部周辺に損傷が発見
され、改修工事を要する場合も圧力容器１の外側から改
修工事を実施することが出来る。4. Effect of the Invention According to the present invention, the pressure vessel 1 and the short pipe 4 of the nuclear power plant
And the welded portion 9 between the short pipe 4 and the through pipe 2
However, since the non-destructive inspection for investigating the presence or absence of damage such as stress corrosion cracking around these welds can be performed from the outside of the pressure vessel, Also, when damage is found around these welds and repair work is required, the repair work can be performed from the outside of the pressure vessel 1.
従って、第１表に示すように、前記非破壊検査あるいは
前記改修工事での放射線被曝線量が、従来の場合に比し
著しく軽減され、作業性も大巾に向上するので作業が集
中的に、かつ短期間で実施できることになり、原子力プ
ラントの稼動率の低下を防止し、コスト面でも著しい節
減が期待できる。Therefore, as shown in Table 1, the radiation exposure dose in the non-destructive inspection or the repair work is remarkably reduced as compared with the conventional case, and the workability is greatly improved. Moreover, it can be implemented in a short period of time, which can prevent a decrease in the operating rate of the nuclear power plant and expect significant cost savings.
第１図は本発明による圧力容器と短管と貫通配管とから
なる配管溶接構造の部分断面図、第２図は原子力プラン
トの圧力容器の全体構成図、第３図は従来技術における
圧力容器と短管と貫通配管とからなる配管溶接構造の部
分断面図を示す。 １……圧力容器、２……貫通配管、 ３……肉盛溶接部、４……短管、 7,8……肉盛溶接部、9,10……溶接部。FIG. 1 is a partial sectional view of a pipe welding structure comprising a pressure vessel according to the present invention, a short pipe and a through pipe, FIG. 2 is an overall configuration diagram of a pressure vessel of a nuclear power plant, and FIG. The partial cross section figure of the piping welding structure which consists of a short pipe and penetration piping is shown. 1 ... Pressure vessel, 2 ... Penetration pipe, 3 ... Overlay weld, 4 ... Short pipe, 7,8 ... Overlay weld, 9, 10 ... Weld.
Claims (2)
を貫いて設けられる貫通配管が、前記圧力容器に短管を
介して溶接される、圧力容器の配管溶接構造において、
前記圧力容器に設けられた穴の内側と、前記圧力容器の
外側の穴周辺部の全面に、予め耐食性金属の肉盛溶接部
が設けられ、次いで、前記穴に耐食性金属からなる短管
が挿入され、該短管と前記圧力容器とが該圧力容器の外
側でシール溶接により取付けられた後、前記短管内に耐
食性金属からなる前記貫通配管が挿入され、該貫通配管
と前記短管とが前記圧力容器の外側でシール溶接により
取付けられる構造であることを特徴とする圧力容器の配
管溶接構造。1. A pipe welding structure for a pressure vessel, wherein a through pipe provided to penetrate the pressure vessel of a nuclear power plant outside and inside is welded to the pressure vessel via a short pipe.
Inside of the hole provided in the pressure vessel and the entire periphery of the hole outside the pressure vessel, a weld overlay of corrosion resistant metal is provided in advance, and then a short pipe made of corrosion resistant metal is inserted into the hole. After the short pipe and the pressure vessel are attached by seal welding on the outside of the pressure vessel, the through pipe made of corrosion resistant metal is inserted into the short pipe, and the through pipe and the short pipe are A pipe welding structure for a pressure vessel, wherein the structure is attached by seal welding on the outside of the pressure vessel.
接部に設けられた前記圧力容器の外側と内側とを貫いて
設けられた前記貫通配管が、前記圧力容器に前記短管を
介して溶接により取付けられる配管溶接構造において、
前記圧力容器に設けられた穴の内側と、前記圧力容器の
外側の穴周辺部の全面に、予めニオブ含有の高耐食性ニ
ッケル基合金（安定化パラメーターが７以上）による
肉盛溶接部が設けられ、次いで前記穴に、ニオブ含有の
高耐食性ニッケル基合金よりなる前記短管が挿入され、
該短管と前記圧力容器とが該圧力容器の外側でシール溶
接により取付けられて、安定化パラメーターが７以上
の高耐食性ニッケル基合金からなる溶接部が設けられた
後、前記短管内に前記貫通配管が挿入され、該短管と該
貫通配管とが前記圧力容器の外側でシール溶接により取
付けられて、安定化パラメーターが７以上の高耐食性
ニッケル基合金からなる溶接部が設けられた構造である
ことを特徴とする、特許請求の範囲第１項に記載の圧力
容器の配管溶接構造。2. The through pipe, which is provided on the inner surface of the pressure vessel at the build-up welded portion of the corrosion-resistant metal and extends through the outer side and the inner side of the pressure vessel, is provided in the pressure vessel via the short pipe. In a pipe welding structure that is attached by welding
A built-up weld made of a niobium-containing highly corrosion-resistant nickel-base alloy (stabilization parameter: 7 or more) was previously provided on the inside of the hole provided in the pressure vessel and the entire area around the hole on the outside of the pressure vessel. , Then, the short tube made of niobium-containing highly corrosion-resistant nickel-based alloy is inserted into the hole,
The short pipe and the pressure vessel are attached to each other by seal welding on the outside of the pressure vessel, and a welding portion made of a highly corrosion-resistant nickel-based alloy having a stabilization parameter of 7 or more is provided, and then the penetration is made in the short tube. A structure is provided in which a pipe is inserted, the short pipe and the through pipe are attached by seal welding on the outside of the pressure vessel, and a welding portion made of a highly corrosion-resistant nickel-based alloy having a stabilization parameter of 7 or more is provided. The pipe welding structure for a pressure vessel according to claim 1, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21343286A JPH07102454B2 (en) | 1986-09-10 | 1986-09-10 | Welding structure for pressure vessel piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21343286A JPH07102454B2 (en) | 1986-09-10 | 1986-09-10 | Welding structure for pressure vessel piping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6368271A JPS6368271A (en) | 1988-03-28 |
| JPH07102454B2 true JPH07102454B2 (en) | 1995-11-08 |
Family
ID=16639128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21343286A Expired - Lifetime JPH07102454B2 (en) | 1986-09-10 | 1986-09-10 | Welding structure for pressure vessel piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07102454B2 (en) |
-
1986
- 1986-09-10 JP JP21343286A patent/JPH07102454B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6368271A (en) | 1988-03-28 |
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