JPS61235733A - Detector for leakage of water in sodium - Google Patents
Detector for leakage of water in sodiumInfo
- Publication number
- JPS61235733A JPS61235733A JP7645285A JP7645285A JPS61235733A JP S61235733 A JPS61235733 A JP S61235733A JP 7645285 A JP7645285 A JP 7645285A JP 7645285 A JP7645285 A JP 7645285A JP S61235733 A JPS61235733 A JP S61235733A
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen
- pipe
- downcomer
- water
- tube
- 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.)
- Pending
Links
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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
- G01M3/228—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators for radiators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は高速増殖炉の蒸気発生器等で用いるナトリウム
中水漏洩検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a water-in-sodium leak detection device used in a steam generator of a fast breeder reactor or the like.
従来、たとえば高速増殖炉の蒸気発生器においては、伝
熱管からの水漏洩を早期に検出する必要があり、第２図
に示す様にＮａ中の水素濃度変化を常時監視する方式の
水漏洩検出装置（１８）と、カバーガス中の水素濃度変
化を常時監視する水漏洩検出装置（１９）が取付いてい
る。第２図において、ＮａはＮａヘッダー（１）から、
シュラウド（２）に入り、伝熱管（３）に熱を与えたの
ち、下部配管（４）から出てゆく。伝熱管（３）は、水
ヘツダ−（５）からシュラウド（２）の外側にあるダウ
ンカマー（６）に入り、蒸気発生器の容器（７）の底部
からシュラウド（２）の内側に入り、Ｎａから熱を受け
ながら、カバーガス空間（８）に出てゆく構造となって
いる。Conventionally, for example, in the steam generator of a fast breeder reactor, it is necessary to detect water leakage from heat transfer tubes at an early stage, and as shown in Figure 2, a water leakage detection method that constantly monitors changes in the hydrogen concentration in Na has been used. A device (18) and a water leakage detection device (19) that constantly monitors changes in hydrogen concentration in the cover gas are attached. In Figure 2, Na is from the Na header (1),
After entering the shroud (2) and imparting heat to the heat transfer tube (3), it exits from the lower pipe (4). The heat transfer tubes (3) enter the downcomer (6) outside the shroud (2) from the water header (5) and enter the inside of the shroud (2) from the bottom of the steam generator vessel (7); The structure is such that the Na gas flows out into the cover gas space (8) while receiving heat from the Na gas.
上記の水漏洩検出装置は、Ｎａ出口配管（４）と。The water leak detection device described above has a Na outlet pipe (4).
カバーガス空間（８）に取付いている。いずれも、Ｎａ
あるいは、カバーガスをサンプリングして。It is attached to the cover gas space (8). In both cases, Na
Or by sampling the cover gas.
内部に含まれる水素の濃度変化を監視するものである（
伝熱管から水が、Ｎａ中に洩れると、Ｎａ水反応が生じ
、水素が発生するため、Ｎａ中。It monitors changes in the concentration of hydrogen contained inside (
When water leaks from the heat transfer tube into Na, a Na-water reaction occurs and hydrogen is generated.
カバーガス中の水素濃度が変化することを利用して水漏
洩を検出する）。Water leaks are detected by using changes in the hydrogen concentration in the cover gas).
しかし、この様な方式の検出装置では、ダウンカマ（６
）にある伝熱管（３）からの水漏洩を下記の理由により
検出できない欠点がある。蒸気発生器内の熱水力学的安
定性の面から、ダウンカマ内のＮａの対流（循環）はで
きるだけ抑制する必要があり、このため、ダウンカマ内
には多くの対流抑制板（９）が取付けられている。この
ため、水漏洩点（１０）で発生した水素は、その近傍し
か広がらず、検出装置に到達できなくなる。However, in this type of detection device, the downcomer (6
) has the disadvantage that water leakage from the heat exchanger tube (3) cannot be detected for the following reasons. From the viewpoint of thermal-hydraulic stability within the steam generator, it is necessary to suppress Na convection (circulation) within the downcomer as much as possible, and for this reason, many convection suppression plates (9) are installed inside the downcomer. ing. Therefore, hydrogen generated at the water leak point (10) spreads only in the vicinity and cannot reach the detection device.
なお、水漏洩検出器として、特願昭５５−１７２４９４
号に示すものが知られている。In addition, as a water leak detector, Japanese Patent Application No. 55-172494
The one shown in the number is known.
本発明の目的は、上記した従来方式の欠点をなくシ、ダ
ウンカマ一部にある伝熱管からの水漏洩も高感度で検出
しうる装置を提供することにある。An object of the present invention is to eliminate the drawbacks of the conventional method described above and to provide a device that can detect water leakage from a heat transfer tube in a part of a downcomer with high sensitivity.
上記の目的を達成するため、本発明では、水素を透過さ
せやすい薄肉のニッケル管をダウンカマ内に挿入し、Ｎ
ａ中の水素をニッケル管を通して検出器へ導びく方法を
とる。In order to achieve the above object, in the present invention, a thin-walled nickel tube that easily permeates hydrogen is inserted into the downcomer, and N
A method is used in which the hydrogen in a is guided to the detector through a nickel tube.
第１図に本発明の基本構成を示す。薄肉のニッケル管（
１１）は、伝熱管と同じく、水ヘツダ（５）からダウン
カマ（６）内に挿入しである。ニッケル管（１１）の先
端は、ダウンカマ（６）の底部まで延長しである。ニッ
ケル管（１１）の内部を真空にするためにイオンポンプ
（１２）を取付け、さらに管内部の水素濃度を検出する
ためのイオンゲージ（１３）を取付けである。イオンポ
ンプ（１２）を運転すると、管内部は真空になり、管の
外側（Ｎａ側）の水素は、薄肉のニッケル管壁を介して
管内に透過し、イオンゲージ（１３）に運ばれ、その濃
度が検出される構成となっている。FIG. 1 shows the basic configuration of the present invention. Thin-walled nickel tube (
11) is inserted into the downcomer (6) from the water header (5) like the heat transfer tube. The tip of the nickel tube (11) extends to the bottom of the downcomer (6). An ion pump (12) is attached to evacuate the inside of the nickel tube (11), and an ion gauge (13) is also attached to detect the hydrogen concentration inside the tube. When the ion pump (12) is operated, the inside of the tube becomes vacuum, and the hydrogen on the outside of the tube (Na side) permeates into the tube through the thin nickel tube wall, is carried to the ion gauge (13), and is transferred to the ion gauge (13). The configuration is such that the concentration is detected.
この様な検出装置の構成において、水素検出感度を大き
くするには、ニッケル管（１１）がナトリウムに触れる
表面積をできるだけ広くすればよい。In the configuration of such a detection device, in order to increase hydrogen detection sensitivity, the surface area of the nickel tube (11) that comes into contact with sodium should be made as large as possible.
このためには、第３図に示すごとく、ニッケル管を曲管
にするか、もしくはコイル状にすればよい。For this purpose, the nickel tube may be bent or coiled as shown in FIG.
又、ニッケル管の直径を大きくしてもよい。Alternatively, the diameter of the nickel tube may be increased.
しかし、この場合、ニッケル管の強度が問題となる。特
に、ナトリウムの温度は通常、約５００℃でニッケル管
の機械的強度は、常温の８０％に減少する。このため、
ニッケル管の内部には、何らかの機械的な補強が必要と
なる。However, in this case, the strength of the nickel tube becomes a problem. In particular, when the temperature of sodium is usually about 500° C., the mechanical strength of the nickel tube is reduced to 80% of that at room temperature. For this reason,
Some mechanical reinforcement is required inside the nickel tube.
以下、ニッケル管の補強構造に関し、実施例を用いて詳
細に説明する。第４図はニッケル管の実施例を示す。こ
のうちａ図はニッケル管（１１）（肉厚、０．５ａｍ）
の内部を焼結金属（１４）で埋めた場合を示す。焼結金
属（１４）はナトリウム外圧に対してニッケル管（１１
）を破壊から防、止するために設置されたものである。Hereinafter, the reinforcing structure of the nickel pipe will be described in detail using examples. FIG. 4 shows an example of a nickel tube. Of these, figure a shows a nickel tube (11) (thickness, 0.5am)
This shows a case in which the inside of the is filled with sintered metal (14). The sintered metal (14) is connected to the nickel tube (11) against external sodium pressure.
) was installed to prevent or prevent destruction of the equipment.
ニッケル管を通過した水素は焼結金属内を移動して検出
器に導かれる。焼結金属の材料としてニッケルあるいは
パラジウムを使用すれば水素は気泡部分を移動するばか
りでなく、金属部分も通過するので実質的な流動抵抗が
減少することになる。ｂ図では焼結金属の内部にニッケ
ル管（１１）の軸方向に通ずる空隙部（１５）を設ける
。この空隙部（１５）は水素の検出器への移動を容易に
するものである。この場合においても、焼結金属（１４
）はニッケル管（１１）を補強するものに役立っている
。Ｃ図ではニッケル管（１１）を構造上、支持するため
に蛇腹形状の管（１６）をニッケル管（１１）内部に挿
入している。ｄ図ではニッケル管（１１）の中心から放
射状に平板（１７）をニッケル管（１１）に接するまで
延長し、支持するものである。Ｃ図およびｄ図の構造で
あれば水素の検出器への移動を妨げるものではない。Hydrogen that has passed through the nickel tube moves within the sintered metal and is guided to the detector. If nickel or palladium is used as the material for the sintered metal, hydrogen not only moves through the bubbles but also passes through the metal parts, thereby reducing substantial flow resistance. In Figure b, a cavity (15) is provided inside the sintered metal that communicates in the axial direction of the nickel tube (11). This void (15) facilitates the movement of hydrogen to the detector. In this case as well, sintered metal (14
) serves to reinforce the nickel tube (11). In Figure C, a bellows-shaped tube (16) is inserted into the nickel tube (11) to structurally support the nickel tube (11). In Figure d, a flat plate (17) is extended and supported radially from the center of the nickel tube (11) until it comes into contact with the nickel tube (11). The structures shown in Figures C and d do not prevent hydrogen from moving to the detector.
以上のべたごとく、本発明によれば、ニッケル管が補強
しであるので、自由自在に曲げる事ができる、管表面を
拡大する事ができる。この結果、水素検出感度を高める
事ができる。また、ナトリウムの停滞域にも容易に挿入
できるので、水素が流体中に拡がりにくい部分、たとえ
ばダウンカマ域での伝熱管からの水漏洩も検出する事が
可能である。As described above, according to the present invention, since the nickel tube is reinforced, it can be bent freely and the tube surface can be expanded. As a result, hydrogen detection sensitivity can be increased. Furthermore, since it can be easily inserted into areas where sodium stagnates, it is also possible to detect water leakage from heat transfer tubes in areas where hydrogen is difficult to spread into the fluid, such as downcomer areas.
したがって、高速増殖炉等におけるナトリウム中水漏洩
早期検出機能向上への寄与は大きい。Therefore, it will greatly contribute to improving the early detection function of water-in-sodium leaks in fast breeder reactors and the like.
第１図は、本発明のなるナトリウム中水漏洩検出装置の
基本構成を説明する図、第２図は、従来の水素検出感度
と蒸気発生器の構成を説明する図、第３図は水素検出感
度を高くするためのニッケル管の構造例を説明する図、
第４図は、ニッケル管内部構造に関する実施例を説明す
る図である。
２・・・シュラウド、３・・・伝熱管、６・・・ダウン
カマ（Ｎａ停滞域）、７・・・蒸気発生器容器、８・・
・カバーガス空間、９・・・対流抑制板、１０・・・水
漏洩点、１１・・・ニッケル管、１２・・・イオンポン
プ、１３・・・イオンゲージ０．−１
１゛ ゝ
代理人 弁理士 小川勝男 ′
Ｎ界
ｔｃＬ）
（Ｃン
４ 図
（ｂン
Ｉ
（ｄ）Figure 1 is a diagram explaining the basic configuration of the water-in-sodium leak detection device according to the present invention, Figure 2 is a diagram explaining the conventional hydrogen detection sensitivity and the configuration of a steam generator, and Figure 3 is a diagram explaining the hydrogen detection sensitivity and the configuration of a steam generator. A diagram explaining an example of the structure of a nickel tube to increase sensitivity,
FIG. 4 is a diagram illustrating an example regarding the internal structure of the nickel tube. 2... Shroud, 3... Heat exchanger tube, 6... Downcomer (Na stagnation area), 7... Steam generator container, 8...
- Cover gas space, 9... Convection suppression plate, 10... Water leak point, 11... Nickel pipe, 12... Ion pump, 13... Ion gauge 0. -1 1ゝ Agent Patent attorney Katsuo Ogawa ′ Nkai tcL) (Cn4 Figure (bnI (d)
Claims (1)
る容器において、ナトリウムが停滞している個所に、内
部に焼結金属等の水素透過性材料を詰めこんだ薄肉のニ
ッケル管を挿入し、容器内の水素を上記ニッケル管を通
じて外部に導く機能を有した事を特徴とするナトリウム
中水漏洩検出装置。1. In a container where sodium and water come into contact through a heat transfer tube to exchange heat, insert a thin-walled nickel tube filled with a hydrogen-permeable material such as sintered metal into the area where sodium is stagnant. A water-in-sodium leak detection device, characterized in that it has a function of guiding hydrogen in the container to the outside through the nickel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7645285A JPS61235733A (en) | 1985-04-12 | 1985-04-12 | Detector for leakage of water in sodium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7645285A JPS61235733A (en) | 1985-04-12 | 1985-04-12 | Detector for leakage of water in sodium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61235733A true JPS61235733A (en) | 1986-10-21 |
Family
ID=13605538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7645285A Pending JPS61235733A (en) | 1985-04-12 | 1985-04-12 | Detector for leakage of water in sodium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61235733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051089A (en) * | 1999-08-04 | 2001-02-23 | Mitsubishi Heavy Ind Ltd | Water leakage detector |
-
1985
- 1985-04-12 JP JP7645285A patent/JPS61235733A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051089A (en) * | 1999-08-04 | 2001-02-23 | Mitsubishi Heavy Ind Ltd | Water leakage detector |
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