JPS6118157B2 - - Google Patents
Info
- Publication number
- JPS6118157B2 JPS6118157B2 JP54091891A JP9189179A JPS6118157B2 JP S6118157 B2 JPS6118157 B2 JP S6118157B2 JP 54091891 A JP54091891 A JP 54091891A JP 9189179 A JP9189179 A JP 9189179A JP S6118157 B2 JPS6118157 B2 JP S6118157B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- sleeve
- intermediate sleeve
- pressure vessel
- flange
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 239000002826 coolant Substances 0.000 description 6
- 230000008646 thermal stress Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- Pressure Vessels And Lids Thereof (AREA)
Description
【発明の詳細な説明】
本発明は、原子炉圧力容器の給水等に用いられ
るノズルに係り、特にノズルコーナー部の熱応力
クラツクの発生を防止して、原子炉圧力容器等の
安全性を高め得るノズルに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle used for water supply to a nuclear reactor pressure vessel, etc., and in particular prevents the occurrence of thermal stress cracks at nozzle corners, thereby increasing the safety of the reactor pressure vessel, etc. Regarding the nozzle obtained.
従来の原子炉圧力容器の給水ノズルは、例えば
第１図に示すように、圧力容器の胴部１の外側に
一体に形成された筒状のノズル本体２と、このノ
ズル本体２に内側からすきま嵌めされたサーマル
スリーブ３とを有している。このサーマルスリー
ブ３の内端部は溶接部４を介して給水スパージヤ
５に接続されており、原子炉圧力容器の外側から
矢印ａ方向に沿つて流入する低温の冷却材が、こ
のノズルおよび給水スパージヤ５を経て、図示し
ない給水スパージヤノズルから圧力容器内に注入
されるようになつている。しかして、通常圧力容
器は高温（沸騰水型原子炉の場合約300℃）で冷
却材は低温（沸騰水型原子炉の給水温度は200
℃）であるから、ノズルはこのような温度差に対
処できるように、ノズル本体２とサーマルスリー
ブ３との間に隙間ｇを保つて後者を前者に緩挿す
るようにしている。そのため、給水スパージヤ５
の流体圧力と圧力容器内の圧力との差圧により、
上記隙間ｇを通つてサーマルスリーブ３の外側を
流れる漏流Ｌが生じ、この漏流Ｌは主にノズル本
体２の内側コーナ部Ｃを局部的に冷却することに
なる。この漏流Ｌは上記内側コーナ部に熱応力を
発生させ、この部分にクラツクを生じさせる恐れ
がある。 A conventional water supply nozzle for a reactor pressure vessel, as shown in FIG. It has a fitted thermal sleeve 3. The inner end of this thermal sleeve 3 is connected to a water supply spargeer 5 via a weld 4, and the low-temperature coolant flowing from the outside of the reactor pressure vessel in the direction of arrow a flows through this nozzle and water supply spargeer. 5, and is injected into the pressure vessel from a water supply sparge nozzle (not shown). Normally, the pressure vessel is at a high temperature (approximately 300°C in the case of a boiling water reactor) and the coolant is at a low temperature (the feed water temperature in a boiling water reactor is approximately 200°C).
C), so that the nozzle can cope with such a temperature difference by maintaining a gap g between the nozzle body 2 and the thermal sleeve 3 so that the latter is loosely inserted into the former. Therefore, the water supply spargeer 5
Due to the differential pressure between the fluid pressure of and the pressure inside the pressure vessel,
A leakage flow L flows outside the thermal sleeve 3 through the gap g, and this leakage flow L mainly locally cools the inner corner C of the nozzle body 2. This leakage flow L generates thermal stress in the inner corner portion, which may cause a crack in this portion.
そこで、本発明の目的は、上記した不都合を解
消し、ノズル本体の内側コーナ部におけるクラツ
クの発生を防止し得るノズルを提供するにある。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a nozzle which can eliminate the above-mentioned disadvantages and prevent cracks from occurring at the inner corner portions of the nozzle body.
以下、本発明の実施例を第２図および第３図を
参照して説明する。 Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.
第２図において符号６は中間スリーブを示し、
この中間スリーブ６はノズル本体２の内筒部に装
着されている。中間スリーブ６の外端は例えば隅
肉溶接等の結合手段により、ノズル本体２の内周
面開口端縁付近に一体的に接合されている。ま
た、中間スリーブの内端部は、圧力容器の胴部１
の内面より内側に突出している。 In FIG. 2, reference numeral 6 indicates an intermediate sleeve;
This intermediate sleeve 6 is attached to the inner cylindrical portion of the nozzle body 2. The outer end of the intermediate sleeve 6 is integrally joined to the inner peripheral surface of the nozzle body 2 near the opening edge by a joining means such as fillet welding. Moreover, the inner end of the intermediate sleeve is connected to the body 1 of the pressure vessel.
protrudes inward from the inner surface of
上記中間スリーブ６の内筒部には、所要の隙間
ｇを介して、前記サーマルスリーブ３が緩挿され
ている。 The thermal sleeve 3 is loosely inserted into the inner cylindrical portion of the intermediate sleeve 6 through a required gap g.
本発明によれば、このサーマルスリーブ３と上
記中間スリーブ６とを同種の材料例えばステンレ
ス鋼で製造することが重要であり、それによつ
て、金属電位差に基づく腐食の増進を防ぐことが
できる。 According to the invention, it is important that this thermal sleeve 3 and the intermediate sleeve 6 are made of the same type of material, for example stainless steel, so as to prevent increased corrosion due to metal potential differences.
なお、第２図において第１図と同符号を付した
部分は、第１図と均等な部分を示す。 In addition, in FIG. 2, parts given the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1.
上記のように構成された本発明の一実施例によ
るノズルは、中間スリーブ６の外端がノズル本体
２の内周面開口端縁付近に一体的に接合されてい
るため、本体ノズル２の内面側には冷却材が流入
しない。ただし、ノズル本体２の外端開口部から
冷却材が流入したとき、前記した理由によりサー
マルスリーブ３と中間スリーブ６との間に漏流Ｌ
が発生する。しかしながら、この漏流Ｌは、中間
スリーブ６の内筒部を樋にして圧力容器の胴部１
の内面より内方に導かれ、中間スリーブ６の内端
縁から落下するから、ノズル本体の内側コーナ部
Ｃに触れることはない。 In the nozzle according to the embodiment of the present invention configured as described above, the outer end of the intermediate sleeve 6 is integrally joined to the vicinity of the opening edge of the inner peripheral surface of the nozzle main body 2, so that the inner surface of the main nozzle 2 No coolant flows into the side. However, when the coolant flows in from the outer end opening of the nozzle body 2, there is a leakage L between the thermal sleeve 3 and the intermediate sleeve 6 due to the above-mentioned reason.
occurs. However, this leakage L flows through the body part 1 of the pressure vessel using the inner cylindrical part of the intermediate sleeve 6 as a gutter.
Since it is guided inward from the inner surface of the intermediate sleeve 6 and falls from the inner edge of the intermediate sleeve 6, it does not touch the inner corner C of the nozzle body.
第３図は本発明の変形実施例を示し、この実施
例は、中間スリーブ６の内端にフランジ７を設け
ると共に、サーマルスリーブ３の内端部に、つば
部８を例えば溶接によつて一体的に着設し、これ
らフランジ７とつば部８とをＯリング９を介して
相互に結合したもので、このようにすると、サー
マルスリーブ３と中間スリーブ６との間に漏出し
た冷却材が、つば部８、フランジ７およびＯリン
グ９によつて封止され、冷却材がノズル本体の内
側コーナ部Ｃに触れないことは勿論のこと、圧力
容器内に漏流が流入しないという別の効果があ
る。 FIG. 3 shows a modified embodiment of the present invention, in which a flange 7 is provided at the inner end of the intermediate sleeve 6, and a collar 8 is integrated with the inner end of the thermal sleeve 3, for example by welding. The flange 7 and the collar 8 are connected to each other via an O-ring 9. In this way, the coolant leaking between the thermal sleeve 3 and the intermediate sleeve 6 is It is sealed by the collar 8, flange 7, and O-ring 9, which not only prevents the coolant from touching the inner corner C of the nozzle body, but also has another effect of preventing leakage from flowing into the pressure vessel. be.
以上の説明から明らかなように、本発明は、ノ
ズル本体のノズル孔内に中間スリーブを装着し、
中間スリーブの内端を圧力容器の胴部内面よ内側
に突出出させたので、中間スリーブとこれに緩挿
されたサーマルスリーブとの隙間から圧力容器内
に流入する漏流がノズル本体の内側コーナ部に触
れることは皆無となる。従つて、この部分におけ
る熱応力クラツクの発生は防止され、圧力容器の
安全性が向上する。 As is clear from the above description, the present invention includes installing an intermediate sleeve in the nozzle hole of the nozzle body,
Since the inner end of the intermediate sleeve protrudes inward from the inner surface of the body of the pressure vessel, leakage flowing into the pressure vessel through the gap between the intermediate sleeve and the thermal sleeve loosely inserted into the intermediate sleeve is caused to leak into the inner corner of the nozzle body. There will be no touching of the parts. Therefore, thermal stress cracks are prevented from occurring in this portion, improving the safety of the pressure vessel.
また、サーマルスリーブと中間スリーブとの間
にシール隙間を形成し、両者を同一の材料で構成
したから、金属電位差による腐食の増進を抑制す
ることができるし、また、中間スリーブの入口端
をノズルの孔壁に溶接結合したので溶接作業が容
易なことはもちろん、溶接部の放射線透視検査が
容易となる。 In addition, since a seal gap is formed between the thermal sleeve and the intermediate sleeve, and both are made of the same material, it is possible to suppress corrosion caused by metal potential difference. Since it is welded to the hole wall, not only the welding work is easy, but also radiographic inspection of the welded part is easy.
また、ノズル本体の内側コーナ部の補修等が不
要となるので、プラントの稼動率が向上する他、
補修作業員の放射線被ばく量の低減が期待でき
る、など種々の効果を奏する。 In addition, there is no need to repair the inner corner of the nozzle body, which improves the plant's operating rate.
It has various effects, including a reduction in radiation exposure for repair workers.
第１図は従来のノズルの構造の一例を示す断面
図、第２図は本発明の一実施例によるノズルの断
面図、第３図は本発明の変形実施例によるノズル
の断面図である。
１…胴部、２…ノズル本体、３…サーマルスリ
ーブ、５…給水スパージヤ、６…中間スリーブ、
７…フランジ、８…つば部、９…Ｏリング、Ｃ…
コーナ部、Ｌ…漏流。
FIG. 1 is a cross-sectional view showing an example of the structure of a conventional nozzle, FIG. 2 is a cross-sectional view of a nozzle according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a nozzle according to a modified embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Body part, 2...Nozzle body, 3...Thermal sleeve, 5...Water supply spargeer, 6...Intermediate sleeve,
7...Flange, 8...Brim, 9...O-ring, C...
Corner part, L...Leakage.
Claims (1)
状のノズル本体と、このノズル本体のノズル孔内
に挿入された入口端をノズル孔壁に溶接結合され
た中間スリーブと、この中間スリーブの孔内に緩
挿され、内端が給水スパージヤに接続されたサー
マルスリーブとからなり、上記中間スリーブとサ
ーマルスリーブとを同一の材料で構成すると共
に、上記中間スリーブの孔壁とサーマルスリーブ
の入口端の外周面との間にシール間隙を形成し、
さらに中間スリーブの内端部を原子炉圧力容器の
胴部内面より内方へ突出させたことを特徴とする
ノズル。 ２ 中間スリーブの内端にフランジを形成すると
共に、サーマルスリーブの内端部につば部を一体
的に形成し、これらのフランジとつば部とをＯリ
ングを介して相互に結合したことを特徴とする特
許請求の範囲第１項に記載のノズル。[Scope of Claims] 1. A cylindrical nozzle body integrally formed in the body of the reactor pressure vessel, and an intermediate part in which the inlet end inserted into the nozzle hole of this nozzle body is welded to the nozzle hole wall. It consists of a sleeve and a thermal sleeve that is loosely inserted into the hole of the intermediate sleeve and whose inner end is connected to the water supply spargeer. forming a sealing gap between the wall and the outer peripheral surface of the inlet end of the thermal sleeve;
Furthermore, the nozzle is characterized in that the inner end of the intermediate sleeve projects inward from the inner surface of the trunk of the reactor pressure vessel. 2. A flange is formed at the inner end of the intermediate sleeve, a flange is integrally formed at the inner end of the thermal sleeve, and the flange and the flange are connected to each other via an O-ring. A nozzle according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9189179A JPS5614998A (en) | 1979-07-19 | 1979-07-19 | Nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9189179A JPS5614998A (en) | 1979-07-19 | 1979-07-19 | Nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5614998A JPS5614998A (en) | 1981-02-13 |
| JPS6118157B2 true JPS6118157B2 (en) | 1986-05-10 |
Family
ID=14039173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9189179A Granted JPS5614998A (en) | 1979-07-19 | 1979-07-19 | Nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5614998A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771796B2 (en) * | 1988-06-25 | 1995-08-02 | レンゴー株式会社 | Tool positioning method |
| US6345084B1 (en) * | 1999-11-19 | 2002-02-05 | General Electric Company | Apparatus and methods for replacing a core spray T-box/thermal sleeve in a nuclear reactor |
| JP5859344B2 (en) * | 2012-03-05 | 2016-02-10 | 三菱重工業株式会社 | Thermal sleeve repair method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5430198B2 (en) * | 1972-11-15 | 1979-09-28 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5430198U (en) * | 1977-08-01 | 1979-02-27 |
-
1979
- 1979-07-19 JP JP9189179A patent/JPS5614998A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5430198B2 (en) * | 1972-11-15 | 1979-09-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5614998A (en) | 1981-02-13 |
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