JP2928617B2 - Nozzle structure for recirculation pump built in reactor - Google Patents
Nozzle structure for recirculation pump built in reactorInfo
- Publication number
- JP2928617B2 JP2928617B2 JP2279044A JP27904490A JP2928617B2 JP 2928617 B2 JP2928617 B2 JP 2928617B2 JP 2279044 A JP2279044 A JP 2279044A JP 27904490 A JP27904490 A JP 27904490A JP 2928617 B2 JP2928617 B2 JP 2928617B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- reactor
- recirculation pump
- casing
- built
- 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
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、原子炉内蔵型再循環ポンプのモータケーシ
ングと原子炉圧力容器下鏡部に成型されたノズルとの溶
接部の裏側の溶接形状、状態を確認しやすい構造に係
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a welded shape on the back side of a welded portion between a motor casing of a recirculation pump with a built-in reactor and a nozzle molded in a lower part of a reactor pressure vessel. According to the structure, the state can be easily checked.
第９図は、原子炉内蔵型再循環ポンプモータケーシン
グ６と原子炉圧力容器下鏡５部に成型されたノズル部１
の溶接取付断面図を示す。第８図は原子炉内蔵型再循環
ポンプ構造を示す。原子炉内蔵型再循環ポンプは、原子
炉圧力容器の底部鏡板（下鏡５）の外周に取付けられ、
インペラ８とモータを１本のシャフト11で接続して構成
した水中モーターで、原子炉の炉水の外部への漏れ防止
に関して高信頼性を確保するため、軸封装置のない密閉
型の構造としている。原子炉圧力容器内にあるインペラ
８、ディフューザ９は、約280℃、70kg/m2の高温高圧環
境下にて運転され、モータ部は最下部にある補助インペ
ラによってモータ冷却水が循環し、熱交換器を介して低
温で運転されるようになっている。モータ上下には回転
振動を抑えるラジアル軸受12があり、シャフト11の下端
には回転体の上下荷重を支えるスラスト軸受17がある。
これらのポンプ機能を生かし、ノズル１部とモータケー
シング６の接続形状は、ノズル１部中心線と、モータケ
ーシング６中心線の相対変化を小さく抑えるために、ノ
ズル１のモータケーシング６の上部に間隙（約10mm巾）
を設けたサーマルスリーブ方式をとっている。また、ポ
ンプ取付ノズルとスリーブ間にエアギャップ２（約0.6m
m）を設け、この断熱効果により、スリーブ部の温度分
布を均一化し、不均一な熱変形を生じないようにしてい
る。又このエアギャップ２は、ポンプの据付時の芯合わ
せ時くるいを少なくする為に大きくする事は困難であ
る。FIG. 9 shows a nozzle casing 1 formed on a reactor built-in recirculation pump motor casing 6 and a lower part of a reactor pressure vessel lower mirror 5.
FIG. FIG. 8 shows a structure of a recirculation pump incorporated in a nuclear reactor. The reactor built-in recirculation pump is mounted on the outer periphery of the bottom head (lower head 5) of the reactor pressure vessel,
An underwater motor composed of an impeller 8 and a motor connected by a single shaft 11, and has a sealed structure without a shaft sealing device to ensure high reliability in preventing leakage of reactor water to the outside. I have. The impeller 8 and the diffuser 9 in the reactor pressure vessel are operated under a high-temperature and high-pressure environment of about 280 ° C. and 70 kg / m 2 , and the motor section circulates motor cooling water by an auxiliary impeller at the lowermost part. It operates at a low temperature via an exchanger. A radial bearing 12 for suppressing rotational vibration is provided above and below the motor, and a thrust bearing 17 for supporting a vertical load of the rotating body is provided at a lower end of the shaft 11.
Taking advantage of these pump functions, the connection shape between the nozzle 1 and the motor casing 6 is formed with a gap above the motor casing 6 of the nozzle 1 in order to reduce the relative change between the center line of the nozzle 1 and the center line of the motor casing 6. (About 10mm width)
The thermal sleeve system provided with is adopted. Also, an air gap 2 (approximately 0.6m) between the pump mounting nozzle and the sleeve
m), and the heat insulating effect makes the temperature distribution of the sleeve portion uniform and prevents non-uniform thermal deformation. Further, it is difficult to increase the air gap 2 in order to reduce the length of the air gap when the pump is installed.
従来の原子炉内蔵型再循環ポンプのモータケーシング
６と原子炉圧力容器下鏡５部に成型されたノズル１との
溶接部３は、第９図に示す如く、原子炉圧力容器内から
モータ部への入熱を小さくし、モータケーシング６の終
方向の温度分布を一様化し変形量も小さくする為に、原
子炉圧力容器内ポンプノズルスタブ部とモータケーシン
グスリーブ部との間に間隙を設けたスリーブタイプ構造
をとっている。As shown in FIG. 9, a welded portion 3 between the motor casing 6 of the conventional recirculation pump with a built-in reactor and the nozzle 1 formed on the lower part of the reactor pressure vessel mirror 5 is moved from the inside of the reactor pressure vessel to the motor section. A gap is provided between the pump nozzle stub in the reactor pressure vessel and the motor casing sleeve in order to reduce the heat input to the motor casing 6, to make the temperature distribution in the final direction of the motor casing 6 uniform, and to reduce the amount of deformation. It has a sleeve type structure.
この構造では、ノズル１部の溶接部３の裏波部４の形
状、状態を確認する事が困難であり、溶接部３の健全性
を直接確認することは困難であった。In this structure, it was difficult to confirm the shape and state of the reverse rim part 4 of the weld part 3 of the nozzle 1 part, and it was difficult to directly confirm the soundness of the weld part 3.
本発明の目的は、原子炉圧力容器底部に直接接続され
る原子炉内蔵型再循環ポンプケーシングの取付溶接部の
裏波の溶接状態を容易に確認できる原子炉内蔵型再循環
ポンプ用ノズル構造を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a nozzle structure for a reactor built-in recirculation pump capable of easily confirming a welding state of a back seam at a mounting weld portion of a reactor built-in recirculation pump casing directly connected to a reactor pressure vessel bottom. To provide.
上記目的を達成するために、本発明は、原子炉圧力容
器の底部に直接接続される原子炉内蔵型再循環ポンプ用
ノズル構造において、前記底部に設けられたノズル部
と、該ノズル部の内側に溶接部で取り付けられたケーシ
ングとを備え、該ケーシングの外面と前記ノズル部の内
面の間に、前記溶接部の裏側の溶接状態を検査するため
の検査装置を挿入可能な空間を設け、更に、該空間に外
部から前記検査装置を挿入するための入口開口を設け
る。In order to achieve the above object, the present invention provides a nozzle structure for a built-in reactor recirculation pump directly connected to a bottom of a reactor pressure vessel, wherein a nozzle provided on the bottom and an inside of the nozzle are provided. A casing attached to the welding portion, and a space is provided between the outer surface of the casing and the inner surface of the nozzle portion, in which an inspection device for inspecting a welding state on the back side of the welding portion can be inserted, And an entrance opening for inserting the inspection device from outside into the space.
本発明によれば、溶接部の裏波（裏側）の溶接状態を
検査するための検査装置を、外部から入口開口に挿入
し、更にケーシング外面とノズル部内面の間に設けた空
間内で溶接部の裏波を検査できる位置まで移動できるの
で、溶接部の裏波の溶接状態を容易に確認することがで
きる。According to the present invention, the inspection device for inspecting the welding state of the reverse side (back side) of the welded portion is inserted from the outside into the inlet opening, and further, the welding is performed in the space provided between the outer surface of the casing and the inner surface of the nozzle portion. Since it is possible to move to the position where the undercut of the welded portion can be inspected, the welding state of the undercut of the welded portion can be easily confirmed.
以下本発明の実施例について説明する。 Hereinafter, embodiments of the present invention will be described.
第１図〜第３図は、ノズル１部内側に検査装置挿入用
の溝加工を実施した例であり、第４〜第６図は、ケーシ
ング６外面に検査装置挿入用の溝加工を実施した例であ
る。1 to 3 show an example in which a groove for inserting an inspection device is formed inside the nozzle 1 part, and FIGS. 4 to 6 show a case in which a groove for inserting an inspection device is formed on the outer surface of the casing 6. It is an example.
第１図は、ノズル１部内面に数ヶ所の軸方向の溝19
（円筒形又は帯状等）を設けた実施例であり、検査装置
を原子炉圧力容器下部から挿入できるように下鏡５部下
方に突出たノズル１部に貫通孔18を設け、ノズル１内面
にこの貫通孔18と連通する軸方向の溝19を設置してい
る。この溝19はエアギャップの上端に位置する広いエア
ギャップ２空間部に達している。溝19の大きさは、検査
装置がファイバースコープであれば数ミリメートルの径
又はスリット又は帯状であればこの溝19および貫通孔18
を通す事が可能であり、マイクロカメラ等であれば10数
ミリメートル以下で充分である。この場合ノズル１の肉
厚部に貫通孔と同様に溝孔を設ける事も可能であるが、
加工が難しくなる為、ノズル１内面に設ける方が有利で
ある。軸方向の溝19は、数が多ければ多い程周方向の溶
接裏波部を広範囲に点検する事が可能である。この例の
場合、点検する毎に検査装置を挿入引出しする事が要求
されるが、次の第２図や第３図の実施例を用いる事によ
り、その問題は解消される。FIG. 1 shows several axial grooves 19 on the inner surface of the nozzle 1.
In this embodiment, a through-hole 18 is provided in the nozzle 1 protruding below the lower mirror 5 so that the inspection device can be inserted from the lower part of the reactor pressure vessel, and an inner surface of the nozzle 1 is provided. An axial groove 19 communicating with the through hole 18 is provided. This groove 19 reaches a large air gap 2 space located at the upper end of the air gap. If the inspection device is a fiberscope, the size of the groove 19 may be several millimeters, or if the inspection device is a slit or a band, the groove 19 and the through hole 18 may be used.
It is possible to use a micro camera or the like. In this case, it is possible to provide a slot in the thick part of the nozzle 1 as in the through hole,
Since processing becomes difficult, it is advantageous to provide the nozzle 1 on the inner surface. The greater the number of the grooves 19 in the axial direction, the more extensively the circumferential reverse weld can be inspected. In the case of this example, it is required to insert and withdraw the inspection device every time the inspection is performed. However, the problem can be solved by using the following embodiment shown in FIG. 2 or FIG.
つまり、貫通孔18からノズル１内面に連通する溝19を
ノズル１内面に沿ってラセン状に加工し、溶接部３のノ
ズル１とケーシング６上部の間隙に検査装置をアクセス
する際、検査装置がこの間隙部に於いて周回して裏波形
状溶接状況を確認できるように工夫したものである。そ
の加工により成形されたラセン状の溝19は、前記の如
く、円筒形又は帯状又はスリット半円筒状、台形状の形
状等が可能であり、周方向継手へのアクセス性を考慮し
た場合第３図に示す如くリード角を溶接部３に近づくに
つれて水平方向に変化させる事が望ましい。That is, when the inspection device accesses the gap between the nozzle 1 of the welded portion 3 and the upper portion of the casing 6 by processing the groove 19 communicating from the through hole 18 to the inner surface of the nozzle 1 in a spiral shape along the inner surface of the nozzle 1, The device is devised so as to be able to go around in the gap to check the state of the back-wave welding. As described above, the spiral groove 19 formed by the processing can have a cylindrical shape, a band shape, a slit semi-cylindrical shape, a trapezoidal shape, or the like. As shown in the figure, it is desirable that the lead angle be changed in the horizontal direction as it approaches the welded portion 3.
第４図〜第５図は、モータケーシング６外面に検査装
置を通過誘導する溝19の加工を実施した例である。第４
図では、ケーシング６の軸方向に数ヶ所の溝19を設けた
例であり、検査装置を原子炉圧力容器下方より挿入でき
るようにケーシング６の圧力容器ノズル１部下部エアギ
ャップ２に沿って溝19を設けたものである。又、第５図
は、ケーシング６外面の溝19を当該ノズル１部及びケー
シング６取付溶接部３の溶接裏波部４側にアクセスする
ラセン状のルートを確保する溝19を加工し、検査装置が
この溝19による間隙部に於いて周回できるように溝19の
リード角も変化させたものであり、このような第５図に
示すラセン状の溝19は複数本設ける事も当然ありうる。4 and 5 show an example in which a groove 19 for guiding the passage through the inspection device is formed on the outer surface of the motor casing 6. FIG. 4th
The figure shows an example in which several grooves 19 are provided in the axial direction of the casing 6. The grooves are formed along the lower air gap 2 of the pressure vessel nozzle 1 of the casing 6 so that the inspection device can be inserted from below the reactor pressure vessel. 19 are provided. FIG. 5 shows an inspection device in which a groove 19 on the outer surface of the casing 6 is formed into a groove 19 for securing a helical route for accessing the nozzle 1 and the side of the welding back seam 4 of the casing 6 mounting weld 3. However, the lead angle of the groove 19 is also changed so that it can go around in the gap formed by the groove 19, and it is naturally possible to provide a plurality of such spiral grooves 19 shown in FIG.
又、第６図の実施例は、マイクロモータを内蔵したマ
イクロカメラ20を挿入する場合の実施例である。ラセン
状の溝19については、前述した第１図〜第５図のいずれ
の形状でももちろん採用する事は可能である。第７図
は、ノズル１とケーシング６のエアギャップ21を水平間
隔が数mm〜10mm程度に大きくし、そのかわりに溝加工を
実施しない構造の実施例である。FIG. 6 shows an embodiment in which a micro camera 20 having a built-in micro motor is inserted. As for the spiral groove 19, it is of course possible to adopt any of the shapes of FIGS. 1 to 5 described above. FIG. 7 shows an embodiment of a structure in which the air gap 21 between the nozzle 1 and the casing 6 is increased to a horizontal distance of about several mm to about 10 mm, and instead, no groove processing is performed.
従来のエアギャップはケーシング６の据付上、約0.6m
m程度の狭あいとしているが、第７図の実施例にあって
は、ケーシング６据付に当って、ノズル溶接部の芯合せ
治具を使って開先合わせ及び芯出し作業を業なうことで
据付けする事が可能である。The conventional air gap is approximately 0.6m due to the installation of the casing 6.
In the embodiment shown in FIG. 7, the installation of the casing 6 requires the use of a centering jig at the nozzle weld to perform the groove alignment and centering work. It is possible to install with.
この場合据付作業がやや繁雑にはなるが、エアギャッ
プ21を大きくとれる為、溶接裏波部４の形状を、検査装
置をそのエアギャップ21に通して把握する事ができる。
又、取付溶接部３の非破壊検査（超音波探傷、放射線透
過試験等）及び裏波の処理も裏側部から対応可能とな
り、取付溶接部３の健全性確保が可能となる。In this case, the installation work becomes somewhat complicated, but since the air gap 21 can be made large, it is possible to grasp the shape of the welding back seam portion 4 by passing the inspection device through the air gap 21.
In addition, the non-destructive inspection (ultrasonic flaw detection, radiation transmission test, and the like) of the mounting welded portion 3 and the processing of the backside wave can also be performed from the back side portion, and the soundness of the mounting welded portion 3 can be ensured.
各実施例では、前記の如く構成されている為、以下に
記載されている効果を上げる事ができる。Since each embodiment is configured as described above, the following effects can be obtained.
（１）原子炉内蔵型再循環ポンプのモータケーシングと
原子炉圧力容器下鏡部に成型されたノズル部の溶接部の
裏側（裏波）の形状、状態を確認する事が可能となる。(1) It is possible to check the shape and state of the back side (ultra-wave) of the welded portion between the motor casing of the reactor built-in type recirculation pump and the nozzle formed in the lower part of the reactor pressure vessel.
（２）従来のノズル取付状態を大巾に変える事なく、又
その特徴である原子炉圧力容器内から、ポンプモータ部
への入熱を低く抑えることができ、ケーシングの周方向
の温度分布を一様化する事による熱変形を小さく抑える
サーマルスリーブ方式を有効に生かして、取付溶接部の
信頼性確認が可能となる。(2) Heat input from the reactor pressure vessel to the pump motor can be kept low without changing the conventional nozzle installation state to a large extent, and the temperature distribution in the circumferential direction of the casing can be reduced. By making effective use of the thermal sleeve method that suppresses thermal deformation due to uniformity, it is possible to check the reliability of the welded joint.
（３）万一のISI時に於いても、前記の検査用溝又は、
ギャップから検査装置を挿入して点検する事ができる構
造を提供できる。(3) Even in the event of ISI, the inspection groove or
It is possible to provide a structure in which an inspection device can be inserted from the gap to perform inspection.
本発明によれば、外部から入口開口に挿入した検査装
置を、ケーシング外面とノズル部内面の間に設けた空間
内を移動させて、溶接部の裏波の溶接状態を容易に確認
することができる。According to the present invention, the inspection device inserted from the outside into the inlet opening can be moved in the space provided between the outer surface of the casing and the inner surface of the nozzle portion to easily check the welding state of the back seam of the welded portion. it can.
第１図は、本発明の第１実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングが溶接接続される
原子炉圧力容器下鏡部に成型されたノズルの縦断面図、
第２図は、本発明の第２実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングが溶接接続される
原子炉圧力容器下鏡部に成型されたノズルの縦断面図、
第３図は、本発明の第３実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングが溶接接続される
原子炉圧力容器下鏡部に成型されたノズルの縦断面図、
第４図は、本発明の第４実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングと原子炉圧力容器
下鏡部に成型されたノズルとの溶接取付部の縦断面図、
第５図は、本発明の第５実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングと原子炉圧力容器
下鏡部に成型されたノズルとの溶接取付部の縦断面図、
第６図は、本発明の第６実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングと原子炉圧力容器
下鏡部に成型されたノズルとの溶接取付部の縦断面図、
第７図は、本発明の第７実施例を示しており、原子炉内
蔵型再循環ポンプのモータケーシングと原子炉圧力容器
下鏡部に成型されたノズルとの溶接取付部の縦断面図、
第８図は、従来の原子炉内蔵型再循環ポンプの全体縦断
面図、第９図は従来例であり、原子炉内蔵型再循環ポン
プのモータケーシングと原子炉圧力容器下鏡部に成型さ
れたノズルとの溶接取付部の縦断面図である。 １……原子炉圧力器下鏡部に成型したノズル、２……エ
アギャップ、３……取付溶接部、４……溶接裏波部、５
……原子炉圧力容器下鏡、６……原子炉再循環ポンプモ
ータのケーシング、７……水流、８……インペラ、９…
…ディフューザ、10……ストレッチチューブ、11……ポ
ンプシャフト、12……ラジアル軸受、13……モータステ
ータ、14……モータケース、15……モータロータ、18…
…貫通孔、19……溝、20……マイクロカメラ、21……エ
アギャップ。FIG. 1 shows a first embodiment of the present invention, and is a longitudinal sectional view of a nozzle molded in a lower part of a reactor pressure vessel to which a motor casing of a built-in reactor type recirculation pump is connected by welding;
FIG. 2 shows a second embodiment of the present invention, and is a vertical sectional view of a nozzle formed in a lower part of a reactor pressure vessel to which a motor casing of a reactor built-in type recirculation pump is connected by welding;
FIG. 3 shows a third embodiment of the present invention, and is a longitudinal sectional view of a nozzle formed in a lower part of a reactor pressure vessel to which a motor casing of a reactor built-in type recirculation pump is connected by welding;
FIG. 4 shows a fourth embodiment of the present invention, and is a longitudinal sectional view of a welding attachment portion between a motor casing of a recirculation pump with a built-in reactor and a nozzle molded in a lower mirror of a reactor pressure vessel,
FIG. 5 shows a fifth embodiment of the present invention, and is a longitudinal sectional view of a welding attachment portion between a motor casing of a reactor built-in type recirculation pump and a nozzle molded in a lower mirror section of a reactor pressure vessel,
FIG. 6 shows a sixth embodiment of the present invention, and is a longitudinal sectional view of a welding attachment portion between a motor casing of a reactor built-in type recirculation pump and a nozzle molded in a lower part of a reactor pressure vessel,
FIG. 7 shows a seventh embodiment of the present invention, and is a longitudinal sectional view of a welding attachment portion between a motor casing of a reactor built-in type recirculation pump and a nozzle molded in a lower mirror section of a reactor pressure vessel,
FIG. 8 is an overall longitudinal sectional view of a conventional recirculation pump with a built-in reactor, and FIG. 9 is a conventional example, which is molded into a motor casing of the recirculation pump with a built-in reactor and a lower mirror section of the reactor pressure vessel. It is a longitudinal cross-sectional view of the welding attachment part with the nozzle which was set. 1 ... Nozzle molded in the lower part of reactor pressure vessel, 2 ... Air gap, 3 ... Mounting weld, 4 ... Welding reverse, 5
……………………………………………………………………………………………………… …………………………… ………………………………………………………………………………………… ··········································· 9
... Diffuser, 10 ... Stretch tube, 11 ... Pump shaft, 12 ... Radial bearing, 13 ... Motor stator, 14 ... Motor case, 15 ... Motor rotor, 18 ...
... through holes, 19 ... grooves, 20 ... micro cameras, 21 ... air gaps.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐川 渉 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 (72)発明者 魚住 弘人 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 (72)発明者 高久 和夫 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 (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 (72)発明者 伊東 敬 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 (58)調査した分野(Int.Cl.6，ＤＢ名) G21C 15/243 520 G21C 17/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Wataru Sagawa 3-1-1, Sachimachi, Hitachi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Hiroto Uozumi 3-1-1, Sachimachi, Hitachi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Plant (72) Inventor Kazuo Takaku 3-1-1 Sachimachi, Hitachi-shi, Ibaraki Prefecture Inside Hitachi Ltd. Hitachi Plant (72) Inventor Koji Fujimoto 3-chome, Sachimachi, Hitachi, Ibaraki No. 1-1 Inside Hitachi, Ltd. Hitachi Plant (72) Inventor Takashi Ito 3-1-1, Yukimachi, Hitachi City, Ibaraki Prefecture Inside Hitachi Plant, Hitachi Ltd. (58) Fields surveyed (Int. Cl. 6 , DB name) G21C 15/243 520 G21C 17/00
Claims (3)
子炉内蔵型再循環ポンプ用ノズル構造において、 前記底部に設けられたノズル部と、該ノズル部の内側に
溶接部で取り付けられたケーシングとを備え、 該ケーシングの外面と前記ノズル部の内面の間に、前記
溶接部の裏側の溶接状態を検査するための検査装置を挿
入可能な空間を設け、 更に、該空間に外部から前記検査装置を挿入するための
入口開口を設けたことを特徴とする原子炉内蔵型再循環
ポンプ用ノズル構造。1. A nozzle structure for a built-in recirculation pump directly connected to the bottom of a reactor pressure vessel, wherein the nozzle is provided at the bottom and is welded inside the nozzle. A casing, between the outer surface of the casing and the inner surface of the nozzle portion, a space in which an inspection device for inspecting a welding state on the back side of the welded portion is provided, and further, the space is externally provided in the space. A nozzle structure for a recirculation pump with a built-in reactor, wherein an inlet opening for inserting an inspection device is provided.
は帯状の溝であることを特徴とする原子炉内蔵型再循環
ポンプ用ノズル構造。2. The nozzle structure according to claim 1, wherein said space is a cylindrical or band-shaped groove.
ファイバースコープ又はマイクロカメラであることを特
徴とする原子炉内蔵型再循環ポンプ用ノズル構造。3. A nozzle structure for a recirculation pump with a built-in nuclear reactor according to claim 1, wherein the inspection device is a fiberscope or a micro camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2279044A JP2928617B2 (en) | 1990-10-19 | 1990-10-19 | Nozzle structure for recirculation pump built in reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2279044A JP2928617B2 (en) | 1990-10-19 | 1990-10-19 | Nozzle structure for recirculation pump built in reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04157398A JPH04157398A (en) | 1992-05-29 |
| JP2928617B2 true JP2928617B2 (en) | 1999-08-03 |
Family
ID=17605620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2279044A Expired - Fee Related JP2928617B2 (en) | 1990-10-19 | 1990-10-19 | Nozzle structure for recirculation pump built in reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2928617B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2736175B2 (en) * | 1991-01-22 | 1998-04-02 | 株式会社東芝 | Reactor pressure vessel |
-
1990
- 1990-10-19 JP JP2279044A patent/JP2928617B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04157398A (en) | 1992-05-29 |
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