JPH028203Y2 - - Google Patents
Info
- Publication number
- JPH028203Y2 JPH028203Y2 JP1981178979U JP17897981U JPH028203Y2 JP H028203 Y2 JPH028203 Y2 JP H028203Y2 JP 1981178979 U JP1981178979 U JP 1981178979U JP 17897981 U JP17897981 U JP 17897981U JP H028203 Y2 JPH028203 Y2 JP H028203Y2
- Authority
- JP
- Japan
- Prior art keywords
- sodium
- leakage
- substrate
- sensing element
- detector
- 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
- 239000000758 substrate Substances 0.000 claims description 9
- 229910052783 alkali metal Inorganic materials 0.000 claims description 8
- 150000001340 alkali metals Chemical class 0.000 claims description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000011734 sodium Substances 0.000 description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 14
- 229910052708 sodium Inorganic materials 0.000 description 14
- 238000001514 detection method Methods 0.000 description 13
- 229910001415 sodium ion Inorganic materials 0.000 description 6
- 229910001338 liquidmetal Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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
- Examining Or Testing Airtightness (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【考案の詳細な説明】
考案の技術分野
本考案は液体金属冷却高速増殖炉プラントまた
は試験施設における液体金属たとえばナトリウム
の漏洩事故を防止するためのアルカリ金属の漏洩
検出器に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an alkali metal leak detector for preventing leakage accidents of liquid metal, such as sodium, in a liquid metal cooled fast breeder reactor plant or test facility.
考案の技術的背景
機器や配管に発生したクラツク等から漏洩した
液体金属たとえばナトリウムは外部雰囲気に接触
し、腐食性の化合物を生成する。たとえ初期に漏
洩した液体金属が微少量であつても機器または配
管に損傷を与える大量の漏洩事故に発展するおそ
れがあり、初期の微少量漏洩時に検知することは
重要である。ここではアルカリ液体金属のうちナ
トリウムの使用例について説明する。Technical Background of the Idea Liquid metal, such as sodium, leaking from cracks in equipment or piping comes into contact with the external atmosphere and generates corrosive compounds. Even if the amount of liquid metal that initially leaks is minute, there is a risk of a large-scale leakage accident damaging equipment or piping, so it is important to detect the initial minute amount of leakage. Here, an example of the use of sodium among alkaline liquid metals will be explained.
背景技術の問題点
従来、このような漏洩を検出する装置として
は、機器または配管の下部に溜つた金属ナトリウ
ムにより電気回路を短絡させる構成の検出器が使
用されている。しかし、この検出器は大量の漏洩
がなければ動作せず、したがつて少量の漏洩を早
期に検出することができない欠点があつた。ま
た、他の構成の検出器としては漏洩により発生し
た放射線ガスに基づき、これを検知するものであ
るが、この検出器は、ガスの拡散速度による時間
遅れが大きく、しかも放射線測定器のような高価
な機器を必要とする難点がある。Problems with the Background Art Conventionally, as a device for detecting such leakage, a detector configured to short-circuit an electric circuit due to metallic sodium accumulated at the bottom of equipment or piping has been used. However, this detector does not work unless there is a large amount of leakage, and therefore has the disadvantage that it cannot detect small amounts of leakage early. In addition, other types of detectors detect radiation gas generated by leakage, but this detector has a large time delay due to the diffusion speed of the gas, and it is difficult to detect radioactive gases such as radiation measuring instruments. The disadvantage is that it requires expensive equipment.
一方、高速増殖炉の２次系や一般の実験装置の
場合には、配管や機器の周囲を保温材によつて被
うことが行われている。そして高速増殖炉２次系
等では、放射性物質のある可能性が少ないので放
射線測定による検出器は使用できない。したがつ
て、保温材と機器あるいは機器の間隙に電気回路
短絡型の漏洩検出器を設けているが、これは前述
した通りの欠点がある。配管、あるいは機器に直
接取り着ける型式の検出器が装置およびプラント
の構成上使用できない場合には通常の光を用いた
煙感知器が採用されている。しかし、この感知器
による場合はナトリウム以外の煙やほこりなどの
影響を受け易いため誤動作するおそれがある。 On the other hand, in the case of the secondary system of a fast breeder reactor and general experimental equipment, the surroundings of piping and equipment are covered with a heat insulating material. In fast breeder reactor secondary systems and the like, there is little possibility that radioactive materials are present, so detectors that measure radiation cannot be used. Therefore, an electric circuit short-circuit type leak detector is provided between the heat insulating material and the equipment or between the equipment, but this has the drawbacks described above. When a type of detector that can be attached directly to piping or equipment cannot be used due to the configuration of the equipment or plant, smoke detectors that use ordinary light are used. However, if this sensor is used, it may malfunction because it is easily affected by smoke, dust, etc. other than sodium.
考案の目的
本考案は上記の欠点を除去し、検出素子として
測温抵抗体を用いることにより少ない漏洩であつ
ても早期に検出して事故の拡大を末然に防ぐこと
ができるアルカリ金属の漏洩検出器を提供するこ
とにある。Purpose of the invention The present invention eliminates the above-mentioned drawbacks and uses a resistance temperature detector as a detection element to detect leakage of alkaline metals at an early stage, thereby preventing the spread of accidents. The purpose is to provide a detector.
考案の概要
すなわち、本考案はセラミツク基板と、この基
板に金属粉末とガラス粉末とを混練した混合物を
コーテングし焼成してなる検出素子と、この検出
素子および前記基板面を覆うアルカリイオン透過
性絶縁層と、前記検出素子にリード線を介して接
続した直流電源および直流電圧計とを具備したこ
とを特徴とするアルカリ金属の漏洩検出器であ
る。Summary of the invention In other words, the invention consists of a ceramic substrate, a detection element formed by coating the substrate with a mixture of metal powder and glass powder and firing it, and an alkali ion-permeable insulator that covers the detection element and the surface of the substrate. The present invention is an alkali metal leakage detector characterized by comprising: a DC power source and a DC voltmeter connected to the detection element via a lead wire.
考案の実施例
以下図面を参照して本考案に係るアルカリ金属
の漏洩検出器の一実施例を説明する。Embodiment of the invention An embodiment of the alkali metal leak detector according to the invention will be described below with reference to the drawings.
第１図において、本考案に係る漏洩検出器は測
温抵抗体１の検出素子７にリード線２ａを接続し
また前記リード線２ａに直流電源３を接続しさら
に直流電圧計４を接続し、かつリード線２ｂへ接
続して成る電気回路から構成されている。直流電
圧計４には信号処理回路５が接続され、その信号
処理回路５により漏洩の判別を行う。 In FIG. 1, the leakage detector according to the present invention has a lead wire 2a connected to the detection element 7 of the resistance temperature detector 1, a DC power source 3 connected to the lead wire 2a, and a DC voltmeter 4 connected thereto. It consists of an electric circuit connected to the lead wire 2b. A signal processing circuit 5 is connected to the DC voltmeter 4, and leakage is determined by the signal processing circuit 5.
上記測温抵抗体１は、機器や配管のクラツク等
によつて漏洩した液体ナトリウムのナトリウムイ
オン（Na+）が侵入すると抵抗が非常に変化する
ため、直流電源により一定電流を流し、電圧の変
化を検出することによりナトリウムの漏洩を検知
することができる。なお直流電源３の直流値を変
えることによつて感度の調整を行う。 The resistance of the above-mentioned resistance temperature detector 1 changes significantly when sodium ions (Na + ) from liquid sodium leaked due to cracks in equipment or piping enter, so a constant current is passed through a DC power supply to prevent voltage changes. Sodium leakage can be detected by detecting . Note that the sensitivity is adjusted by changing the DC value of the DC power supply 3.
第２図は測温抵抗体１の概略構造を示したもの
である。すなわち、アルミナなどのセラミツク基
板６に蛇行状に配列された検出素子７が設けら
れ、この検出素子７はたとえば白金粉末とガラス
粉末を混練して焼成したものからなる。そして、
アルカリ金属等から検出素子７を保護するために
防染用絶縁層８が基板１および検出素子７面上に
被覆されている。防染用絶縁層８の材料として
は、たとえばリンガラス（P.S.G），Si2N4，
Al2O3等ナトリウムイオンが透過し難い材料で形
成されているとともに、その厚さは比較的薄く形
成されている。ナトリウムの漏洩のない場合、す
なわちこのナトリウム漏洩検出器が配置されてい
る雰囲気のナトリウムイオン濃度の低い場合には
実質的にナトリウムイオンの透過を規制する。ま
たナトリウムの漏洩が生じた場合、すなわち雰囲
気のナトリウムイオン濃度が高い場合にはナトリ
ウムの透過を許すように構成されている。この防
染用絶縁層８の厚さはその材料やナトリウムの漏
洩のない場合の雰囲気のナトリウムイオンの濃
度、ナトリウムの漏洩が生じた場合に要求される
検出感度等の条件により設定され、たとえば必ず
しもその値に限定されるものではないが、リンガ
ラス（P.S.G）を用いた場合、この防染用絶縁層
８の厚さは1.2μｍあるいは0.3μｍに設定される。 FIG. 2 shows a schematic structure of the resistance temperature detector 1. As shown in FIG. That is, a ceramic substrate 6 made of alumina or the like is provided with detection elements 7 arranged in a meandering pattern, and the detection elements 7 are made of, for example, kneaded and fired platinum powder and glass powder. and,
In order to protect the detection element 7 from alkali metals and the like, an anti-dye insulating layer 8 is coated on the substrate 1 and the surfaces of the detection element 7. Examples of the material for the resisting insulating layer 8 include phosphorus glass (PSG), Si 2 N 4 ,
It is made of a material such as Al 2 O 3 that is difficult for sodium ions to pass through, and its thickness is relatively thin. When there is no sodium leakage, that is, when the sodium ion concentration of the atmosphere in which the sodium leakage detector is placed is low, the permeation of sodium ions is substantially regulated. Furthermore, the structure is configured to allow sodium to pass through when sodium leakage occurs, that is, when the sodium ion concentration in the atmosphere is high. The thickness of this resisting insulating layer 8 is determined depending on the material, the concentration of sodium ions in the atmosphere when there is no sodium leakage, the detection sensitivity required when sodium leakage occurs, etc. Although not limited to this value, when phosphor glass (PSG) is used, the thickness of the anti-dye insulating layer 8 is set to 1.2 μm or 0.3 μm.
考案の効果
以上説明したように本考案に係るアルカリ金属
の漏洩検出器はアルカリ金属に敏感な測温抵抗体
を検出素子として用いることにより少ない漏洩の
場合でもそれを早期にしかも確実に検出し事故の
拡大を防止することができる効果がある。Effects of the invention As explained above, the alkali metal leak detector according to the invention uses a thermometer sensitive to alkali metals as a detection element, so even small leaks can be detected early and reliably, resulting in accidents. This has the effect of preventing the spread of.
なお本考案は上記実施例に限定されるものでは
なくその要旨を変更しない範囲において種々変形
して実施することができる。 Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist thereof.
以上述べたように本考案によれば検出素子とし
て測温抵抗体を用いることにより、少ない漏洩を
早期に検出して事故の拡大を防ぐことができると
ともに誤動作のおそれのないナトリウムの漏洩検
出装置を提供することができる。 As described above, according to the present invention, by using a resistance temperature sensor as a detection element, small leaks can be detected early to prevent the spread of accidents, and a sodium leak detection device that is free from malfunction can be created. can be provided.
第１図は、本考案に係るアルカリ金属の漏洩検
出器の一実施例を示す回路構成図、第２図は第１
図における測温抵抗体を示す縦断面図である。
１……測温抵抗体、２……リード線、３……直
流電源、４……直流電圧計、５……信号処理回
路、６……セラミツク基板、７……素子、８……
防染用絶縁層。
FIG. 1 is a circuit diagram showing one embodiment of the alkali metal leak detector according to the present invention, and FIG.
It is a longitudinal cross-sectional view which shows the resistance temperature sensor in a figure. DESCRIPTION OF SYMBOLS 1...Resistance temperature sensor, 2...Lead wire, 3...DC power supply, 4...DC voltmeter, 5...Signal processing circuit, 6...Ceramic substrate, 7...Element, 8...
Insulating layer for resist dyeing.
Claims (1)
ガラス粉末とを混練した混合物をコーテングし焼
成した測温抵抗体でもある検出素子と、この検出
素子および前記基板を覆うアルカリイオン透過性
絶縁層と、前記検出素子にリード線を介して接続
した直流電源および直流電圧計とを具備したこと
を特徴とするアルカリ金属の漏洩検出器。 A ceramic substrate, metal powder on this substrate,
A sensing element which is also a resistance temperature sensor coated with a mixture kneaded with glass powder and fired, an alkali ion permeable insulating layer covering this sensing element and the substrate, and a direct current connected to the sensing element via a lead wire. An alkali metal leak detector characterized by comprising a power source and a DC voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981178979U JPS5882663U (en) | 1981-11-30 | 1981-11-30 | Alkali metal leak detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981178979U JPS5882663U (en) | 1981-11-30 | 1981-11-30 | Alkali metal leak detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5882663U JPS5882663U (en) | 1983-06-04 |
| JPH028203Y2 true JPH028203Y2 (en) | 1990-02-27 |
Family
ID=29974260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981178979U Granted JPS5882663U (en) | 1981-11-30 | 1981-11-30 | Alkali metal leak detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5882663U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635037A (en) * | 1980-08-19 | 1981-04-07 | Toshiba Corp | Leakage detector for liquid metal |
-
1981
- 1981-11-30 JP JP1981178979U patent/JPS5882663U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635037A (en) * | 1980-08-19 | 1981-04-07 | Toshiba Corp | Leakage detector for liquid metal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5882663U (en) | 1983-06-04 |
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