JPS6114453B2 - - Google Patents
Info
- Publication number
- JPS6114453B2 JPS6114453B2 JP2995980A JP2995980A JPS6114453B2 JP S6114453 B2 JPS6114453 B2 JP S6114453B2 JP 2995980 A JP2995980 A JP 2995980A JP 2995980 A JP2995980 A JP 2995980A JP S6114453 B2 JPS6114453 B2 JP S6114453B2
- Authority
- JP
- Japan
- Prior art keywords
- water supply
- spargeer
- water
- thermal sleeve
- pressure vessel
- 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 62
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Examining Or Testing Airtightness (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】
本発明は、原子炉における圧力容器の給水管の
接続基部に設けられるサーマルスリーブ及び給水
スパージヤの漏洩や亀裂等のリーク検査方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inspecting leaks, cracks, etc. of a thermal sleeve and water spargeer provided at the connection base of a water supply pipe of a pressure vessel in a nuclear reactor.
従来、この種の給水スパージヤやサーマルスリ
ーブは圧力容器の炉心へ給水するために、給水管
に溶接によつて連結されている。又一方、上記給
水スパージヤは水より約100℃程度の低温の水
を炉内に供給するようになつている関係上、上記
給水スパージヤやサーマルスリーブに熱応力が発
生する。又、上記給水スパージヤの各ノズルは、
ダウンガマ流路上に設けられているため、境界層
の剥離現象により高周波による熱サイクルを生じ
て複雑な熱応力の発生により、溶接部の漏洩や亀
裂（クラツク）を生じることが予測される。 Conventionally, this type of water supply spargeer or thermal sleeve has been connected to a water supply pipe by welding in order to supply water to the core of a pressure vessel. On the other hand, since the water supply spargeer is designed to supply water at a temperature about 100° C. lower than water into the furnace, thermal stress is generated in the water supply spargeer and the thermal sleeve. In addition, each nozzle of the water supply spargeer is
Since it is installed on the down girder flow path, it is predicted that the separation of the boundary layer will cause a thermal cycle due to high frequency waves, which will cause complex thermal stress, resulting in leakage and cracks in the weld.
このように、上記給水管に連結されるサーマル
スリーブや各ノズルに亀裂が発生すると、これが
経時的に徐々に進行して圧力容器や給水スパージ
ヤをも損傷を及ぼし、これに起因して炉心の熱出
力分布が不均一になる等の難点がある。 In this way, if cracks occur in the thermal sleeve or each nozzle connected to the water supply pipes, this will gradually progress over time and cause damage to the pressure vessel and the water supply spargeer, causing the core to heat up. There are drawbacks such as uneven output distribution.
他方、上記圧力容器内は放射線を帯びているた
め、作業者が炉心に直接入つて、サーマルスリー
ブや給水スパージヤの溶接部の漏洩や亀裂等のリ
ーク検査をすれば、被曝するおそれがある。 On the other hand, since the inside of the pressure vessel is irradiated with radiation, there is a risk that workers will be exposed to radiation if they go directly into the reactor core to inspect for leaks or cracks in the welds of the thermal sleeve or water supply spargeer.
本発明は、上述した点に鑑み、圧力容器内の各
噴射ノズルを各ノズル閉鎖装置で一時的に密閉
し、しかる後、上記給水スパージヤ・サーマルス
リーブ及び給水管内の水を排除し、上記圧力容器
に上記各噴射ノズルを水没するまで給水し、次
に、上記給水スパージヤ・サーマルスリーブ及び
給水管に検出気体を圧入して亀裂等にリークを検
出し、これにより上記給水スパージヤ・サーマル
スリーブ等を被曝することなく安全に検査し得る
ようにしたことを目的とする給水スパージヤ・サ
ーマルスリーブのリーク検出方法を提供するもの
である。 In view of the above-mentioned points, the present invention temporarily seals each injection nozzle in the pressure vessel with each nozzle closing device, and then removes the water in the water supply spargeer/thermal sleeve and the water supply pipe. Water is supplied to each of the above injection nozzles until they are submerged in water, and then detection gas is injected into the water supply spargeer/thermal sleeve and water supply pipe to detect leaks in cracks, etc., thereby exposing the water supply spargeer/thermal sleeve, etc. The present invention provides a leak detection method for water supply spargeers and thermal sleeves, which aims to enable safe inspection without having to do any damage.
以下、本発明を図示の一実施例について説明す
る。 Hereinafter, the present invention will be described with reference to an illustrated embodiment.
第１図乃至第３図において、符号１は沸騰水型
原子炉における圧力容器であつて、この圧力容器
１の一部には給水管２が連結されており、この給
水管２の一端部には各開閉弁３，４が設けられて
いる。又、この各開閉弁３と４との間に位置する
給水管２には排出管５が設けられており、この排
出管５の管路上にはドレン弁６が配設されてい
る。又、上記給水管２の連結基部に位置する上記
圧力容器１の連通孔１ａにはサーマルスリーブ７
の一端部７ａが嵌装されており、このサーマルス
リーブ７の他端部７ｂはリング状をなす給水スパ
ージヤ８の基部８ａに溶接によつて連結されてお
り、この給水スパージヤ８の上部には複数の噴射
ノズル９が一定のピツチ間隔を存し、しかも炉心
に向つて噴射し得るように設けられている。 1 to 3, reference numeral 1 is a pressure vessel in a boiling water reactor, and a water supply pipe 2 is connected to a part of this pressure vessel 1, and one end of this water supply pipe 2 is connected to a water supply pipe 2. are provided with respective on-off valves 3 and 4. Further, a discharge pipe 5 is provided in the water supply pipe 2 located between each of the on-off valves 3 and 4, and a drain valve 6 is provided on the pipe path of the discharge pipe 5. Further, a thermal sleeve 7 is installed in the communication hole 1a of the pressure vessel 1 located at the connection base of the water supply pipe 2.
One end 7a is fitted, and the other end 7b of the thermal sleeve 7 is connected by welding to the base 8a of a ring-shaped water supply spargeer 8. The injection nozzles 9 have a constant pitch interval and are provided so as to be able to inject toward the reactor core.
一方、上記圧力容器１内の上記各噴射ノズル９
にはノズル閉鎖装置１０が、例えば打上機（図示
されず）の各吊ロープ２１によつて昇降自在に、
しかも密閉し得るように設けられている。即ち、
上記ノズル閉鎖装置１０は、第２図及び第３図に
示されるように、扁平な扇形をなす基板１１に上
記各噴射ノズル９の各嵌挿孔１２を穿設し、この
各嵌挿孔１２を穿設し、この各嵌挿孔１２の位置
する上記基板１１に例えば圧縮空気で作動する各
シリンダー装置１３を配設し、この各シリンダ装
置１３の各ピストン１４で上記各噴射ノズル９を
開閉し得るようにしたものである。なお、上記各
ピストン１４の先端部にはパツキング１４ａと一
体をなす押え板１４ｂが設けられており、このパ
ツキング１４ａは上記噴射ノズル９の噴出口９ａ
を気密を保つて閉塞し得るようになつている。
又、上記ピストン１４には緩衝用のばね１５が介
装されており、各噴射ノズル９の閉塞時、このば
ね１５は各ピストン１４の押圧力で各噴射ノズル
９に衝撃を与えないようになつている。さらに
又、上記基板１１上にはターミナルボツクス１６
が上記各シリンダー装置１３を作動し得るように
して設けられており、このターミナルボツクス１
６は上記圧力容器１の上位に設けられた操作盤１
７に接続されている。 On the other hand, each of the injection nozzles 9 in the pressure vessel 1
The nozzle closing device 10 is movable up and down, for example, by each hanging rope 21 of a launch machine (not shown).
Moreover, it is provided so that it can be sealed tightly. That is,
As shown in FIGS. 2 and 3, the nozzle closing device 10 has a flat fan-shaped substrate 11 with each insertion hole 12 for each of the injection nozzles 9 formed therein. Each cylinder device 13 operated by compressed air, for example, is arranged on the substrate 11 where each fitting hole 12 is located, and each piston 14 of each cylinder device 13 opens and closes each injection nozzle 9. It was made so that it could be done. A presser plate 14b is provided at the tip of each piston 14 and is integral with a packing 14a.
It is designed to be able to be closed while keeping it airtight.
Further, a buffer spring 15 is interposed in the piston 14, and when each injection nozzle 9 is closed, this spring 15 prevents the impact from being applied to each injection nozzle 9 by the pressing force of each piston 14. ing. Furthermore, a terminal box 16 is provided on the board 11.
is provided to operate each cylinder device 13, and this terminal box 1
Reference numeral 6 denotes an operation panel 1 provided above the pressure vessel 1.
7 is connected.
従つて、圧力容器１の定期検査時、この圧力容
器１内の水を減水して上記給水スパージヤ８を露
呈する。次に、上記ノズル閉鎖装置１０を打上機
による吊ロープ２１によつて降下し、上記各噴射
ノズル９を上記基板１１に穿設された嵌挿孔１２
に嵌装して、静止する。すると、上記操作盤１７
がターミナルボツクス１６を介して上記各シリン
ダー装置１３を作動すると、この各シリンダー装
置１３の各ピストン１４が上記各噴射ノズル９を
一時的に密閉する。 Therefore, during periodic inspection of the pressure vessel 1, the water in the pressure vessel 1 is reduced to expose the water supply spargeer 8. Next, the nozzle closing device 10 is lowered by a hanging rope 21 by a launcher, and each of the injection nozzles 9 is inserted into a fitting hole 12 formed in the base plate 11.
Fit it in and keep it stationary. Then, the operation panel 17
When actuating each cylinder device 13 through the terminal box 16, each piston 14 of each cylinder device 13 temporarily seals each injection nozzle 9.
しかる後、上記給水スパージヤ８、サーマルス
リーブ７及び給水管２内の水を開閉弁４及びドレ
ン弁６を開弁して排除する。他方、上記圧力容器
１内に上記各噴射ノズル９が水没するまで給水す
る。次に、上記ドレン弁６を閉弁すると共に、開
閉弁３を開弁して、例えば圧縮空気若しくはガス
による検出気体を上記給水スパージヤ８、サーマ
ルスリーブ７及び給水管２内に圧入する。しかし
て、上記給水スパージヤ８、サーマルスリーブ７
及び給水管２等の溶接部に亀裂等があれば、気泡
が発生したり、圧力計等による減圧測定によつ
て、リーク場所を検出することができるようにな
つている。因に、上述した実施例における検出気
体の代りに、例えば着色液による検出液体を使用
するように設計変更することは自由である。 Thereafter, the water in the water supply spargeer 8, thermal sleeve 7, and water supply pipe 2 is removed by opening the on-off valve 4 and drain valve 6. On the other hand, water is supplied into the pressure vessel 1 until each of the injection nozzles 9 is submerged in water. Next, the drain valve 6 is closed, and the on-off valve 3 is opened to force the detection gas, such as compressed air or gas, into the water supply spargeer 8, thermal sleeve 7, and water supply pipe 2. Therefore, the water supply spargeer 8 and the thermal sleeve 7
If there are cracks or the like in the welded portions of the water supply pipes 2, etc., air bubbles will be generated, and the location of the leak can be detected by measuring the reduced pressure using a pressure gauge or the like. Incidentally, the design may be changed to use a detection liquid such as a colored liquid instead of the detection gas in the above-described embodiment.
なお、上述した実施例のノズル閉鎖装置は実際
使用する場合、圧力容器１の全内周に亘つて配設
されるものである。 In addition, the nozzle closing device of the above-described embodiment is disposed over the entire inner circumference of the pressure vessel 1 when actually used.
以上述べたように本発明によれば、圧力容器１
の給水管２にサーマルスリーブ７を介して複数の
噴射ノズル９を備えた給水スパージヤ８を連結
し、この各噴射ノズル９をノズル閉鎖装置１０で
一時的に密閉し、しかる後、上記給水スパージヤ
８、サーマルスリーブ７及び給水管２内の水を排
除し、上記圧力容器１に上記各噴射ノズル９を水
没するまで給水し、次に、上記給水スパージヤ
８、サーマルスリーブ７及び給水管２に検出気体
を圧入して亀裂等によるリークを検出するように
なつているので、溶接部等に発生するクラツクを
早期に発見できるばかりでなく、破断等の発生す
る前に修理を施したり、交換をすることができる
から、事故を未然に防止すると共に、原子炉の信
頼性及び安全性を向上することができる。 As described above, according to the present invention, the pressure vessel 1
A water supply spargeer 8 equipped with a plurality of injection nozzles 9 is connected to the water supply pipe 2 via a thermal sleeve 7, each injection nozzle 9 is temporarily sealed with a nozzle closing device 10, and then the water supply spargeer 8 is connected to the water supply pipe 2 of , the water in the thermal sleeve 7 and the water supply pipe 2 is removed, water is supplied to the pressure vessel 1 until each of the injection nozzles 9 is submerged in water, and then the detection gas is introduced into the water supply spargeer 8, the thermal sleeve 7 and the water supply pipe 2. Since it is designed to detect leaks due to cracks etc. by press-fitting, not only can cracks that occur in welds etc. be detected early, but also repair or replacement can be carried out before breakage etc. occurs. This makes it possible to prevent accidents and improve the reliability and safety of nuclear reactors.
第１図は本発明の給水スパージヤ・サーマルス
リーブのリーク検出方法を説明するための断面
図、第２図は本発明に使用されるノズル閉鎖装置
の平面図、第３図は、本発明によるノズル閉鎖装
置の主要部をなすシリンダー装置の拡大断面図で
ある。
１……圧力容器、２……給水管、３，４……開
閉弁、６……ドレン弁、７……サーマルスリー
ブ、８……給水スパージヤ、９……噴射ノズル、
１０……ノズル閉鎖装置、１１……基板、１２…
…嵌挿孔、１３……シリンダー装置、１４……ピ
ストン。
Fig. 1 is a sectional view for explaining the leak detection method of the water supply spargeer/thermal sleeve of the present invention, Fig. 2 is a plan view of the nozzle closing device used in the present invention, and Fig. 3 is a nozzle according to the present invention. FIG. 2 is an enlarged cross-sectional view of a cylinder device that forms the main part of the closure device. 1... Pressure vessel, 2... Water supply pipe, 3, 4... Opening/closing valve, 6... Drain valve, 7... Thermal sleeve, 8... Water supply spargeer, 9... Injection nozzle,
10... Nozzle closing device, 11... Substrate, 12...
...Fitting hole, 13...Cylinder device, 14...Piston.
Claims (1)
て複数の噴射ノズルを備えた給水スパージヤを連
結し、この各噴射ノズルをノズル閉鎖装置で一時
的に密閉し、しかる後、上記給水スパージヤ・サ
ーマルスリーブ及び給水管内の水を排除し、上記
圧力容器に上記各噴射ノズルを水没するまで給水
し、次に、上記給水スパージヤ・サーマルスリー
ブ及び給水管に検出気体を圧入して亀裂等による
リークを検出するようにしたことを特徴とする給
水スパージヤ・サーマルスリーブのリーク検出方
法。 ２ 噴射ノズルを昇降自在の基板上に設置された
シリンダー装置のピストンで開閉し得るようにし
たことを特徴とする特許請求の範囲第１項記載の
給水スパージヤ・サーマルスリーブのリーク検出
方法。[Claims] 1. A water supply spargeer equipped with a plurality of injection nozzles is connected to a water supply pipe of a pressure vessel via a thermal sleeve, each injection nozzle is temporarily sealed with a nozzle closing device, and then the above-mentioned The water in the water supply spargeer/thermal sleeve and water supply pipe is removed, water is supplied to the pressure vessel until each of the injection nozzles is submerged in water, and then the detection gas is pressurized into the water supply spargeer/thermal sleeve and water supply pipe to prevent cracks, etc. A method for detecting leaks in a water supply spargeer/thermal sleeve, characterized in that leaks due to leaks are detected. 2. A leak detection method for a water supply spargeer/thermal sleeve according to claim 1, characterized in that the injection nozzle can be opened and closed by a piston of a cylinder device installed on a vertically movable substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2995980A JPS56126735A (en) | 1980-03-10 | 1980-03-10 | Detecting method for leak of water-supply sparger and thermal sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2995980A JPS56126735A (en) | 1980-03-10 | 1980-03-10 | Detecting method for leak of water-supply sparger and thermal sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56126735A JPS56126735A (en) | 1981-10-05 |
| JPS6114453B2 true JPS6114453B2 (en) | 1986-04-18 |
Family
ID=12290508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2995980A Granted JPS56126735A (en) | 1980-03-10 | 1980-03-10 | Detecting method for leak of water-supply sparger and thermal sleeve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56126735A (en) |
-
1980
- 1980-03-10 JP JP2995980A patent/JPS56126735A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56126735A (en) | 1981-10-05 |
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