JP3427657B2 - Inspection method for uranium hexafluoride gas leakage - Google Patents
Inspection method for uranium hexafluoride gas leakageInfo
- Publication number
- JP3427657B2 JP3427657B2 JP01168997A JP1168997A JP3427657B2 JP 3427657 B2 JP3427657 B2 JP 3427657B2 JP 01168997 A JP01168997 A JP 01168997A JP 1168997 A JP1168997 A JP 1168997A JP 3427657 B2 JP3427657 B2 JP 3427657B2
- Authority
- JP
- Japan
- Prior art keywords
- uranium hexafluoride
- hexafluoride gas
- gas
- leakage
- leak
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、気密容器からの六
弗化ウランガスの漏洩を検出するための漏洩検査方法に
関する。TECHNICAL FIELD The present invention relates to a leak inspection method for detecting a leak of uranium hexafluoride gas from an airtight container.
【０００２】[0002]
【従来の技術】一般に、原子炉で用いられる燃料となる
二酸化ウラン粉末（ＵＯ2）の原料となる濃縮六弗化ウ
ラン（以下、ＵＦ6という）は、例えば図３に示すよう
な気密容器１に充填された状態で、保管、輸送等に供さ
れる。図３に示す気密容器（シリンダともいう）１は、
略カプセル状の本体２の略球面の一部をなす凸曲面状の
両端面にそれぞれバルブ３とプラグ（密栓）４が設けら
れ、更に両端面外周に筒状のスカート部５，６がそれぞ
れ形成されている。このような気密容器１内に液体状の
ＵＦ6が充填されて、内部で固体化され、気密容器１内
の固体以外の空間には六弗化ウランガス（以下、ＵＦ6
ガスという）が存在している。ＵＦ6が充填された気密
容器１内は、通常絶対圧で０．１〜０．２気圧となって
いる。2. Description of the Related Art Generally, concentrated uranium hexafluoride (hereinafter referred to as UF 6 ) which is a raw material of uranium dioxide powder (UO 2 ) which is a fuel used in a nuclear reactor is, for example, an airtight container 1 as shown in FIG. It is used for storage, transportation, etc. in the state of being filled. The airtight container (also called a cylinder) 1 shown in FIG.
A valve 3 and a plug (sealing plug) 4 are provided on both end surfaces of a convex curved surface forming a part of a substantially spherical surface of the substantially capsule-shaped main body 2, and cylindrical skirt portions 5 and 6 are further formed on outer circumferences of both end surfaces. Has been done. Such by liquid UF 6 in an airtight container 1 is filled, is solidified inside, the space other than the solid of the airtight container 1 hexafluoride Urangasu (hereinafter, UF 6
Gas) exists. The inside of the airtight container 1 filled with UF 6 is usually 0.1 to 0.2 atm in absolute pressure.
【０００３】上述のように、ＵＦ6ガスを充填した気密
容器１の内圧は通常、常温ではＵＦ6の蒸気圧である
０．１〜０．２気圧（絶対圧）となっている。この気密
容器１に漏洩があった場合、まず外気が気密容器１内に
流入し、やがて気密容器１の内圧が外圧と等しくなる。
その時点から拡散、あるいは気密容器１内外の温度差に
より、気密容器１内のＵＦ6ガスの外部への漏洩が始ま
る。その漏洩を防ぐため、バルブ３から気密容器１内に
ＵＦ6ガスを充填し、バルブ３を閉めた後に気密容器１
からのＵＦ6ガスの漏洩検査を実施する必要がある。As described above, the internal pressure of the airtight container 1 filled with UF 6 gas is usually 0.1 to 0.2 atm (absolute pressure) which is the vapor pressure of UF 6 at room temperature. When there is a leak in the airtight container 1, the outside air first flows into the airtight container 1 and eventually the inner pressure of the airtight container 1 becomes equal to the outer pressure.
At that time, due to diffusion or a temperature difference between the inside and outside of the airtight container 1, the UF 6 gas in the airtight container 1 starts to leak to the outside. In order to prevent the leakage, UF 6 gas is filled into the airtight container 1 through the valve 3 and after closing the valve 3, the airtight container 1 is closed.
It is necessary to carry out a leak inspection of UF 6 gas from Japan.
【０００４】そこで、上述のような気密容器１内のガス
の漏洩を検査する必要が生じた場合、漏洩検査の手法と
して、一般に、大別して図３乃至図５に示す３つが提案
されている。なお、ここでは、バルブ３についての漏洩
検査によって、これらの検査方法を以下に説明する。
（１）石鹸泡検査
まず、図３に示す第１の検査方法は、気密容器１内にＵ
Ｆ6に対して安定している窒素ガス（加圧用ガス）を充
填して大気圧以上に加圧し、気密に閉弁されたバルブ３
に石鹸水を塗布し、窒素ガス等の漏洩による発泡の有無
を観察する、というものである。Therefore, when it is necessary to inspect the gas leakage in the airtight container 1 as described above, three methods generally shown in FIGS. 3 to 5 are proposed as the leakage inspection methods. Here, these inspection methods will be described below by a leakage inspection of the valve 3. (1) Soap Bubble Inspection First, the first inspection method shown in FIG.
A valve 3 that is filled with nitrogen gas (pressurizing gas) that is stable with respect to F 6 and pressurizes to atmospheric pressure or higher, and is hermetically closed.
Then, soap water is applied to and the presence or absence of foaming due to leakage of nitrogen gas or the like is observed.
【０００５】（２）ヘリウムリーク試験
図４（ａ）に示す第２の検査方法は、気密容器１内にＵ
Ｆ6に対して安定しているヘリウムガスをトレーサーガ
スとして充填する。そして、気密容器１の凸曲面状の端
面に、この端面のほぼ全域を覆うように治具８を気密状
態に取り付けて、バルブ３の周囲に気密の閉鎖空間９を
形成し、この閉鎖空間９に配管１０を介してヘリウムリ
ーク検出器７を接続している。真空ポンプ１１により閉
鎖空間９を真空に排気して、圧力差による気密容器１の
バルブ３から閉鎖空間９内へのヘリウムガスの漏れを、
配管１０を介してヘリウムリーク検出器７で検出するよ
うになっている。なお、図４（ａ）の変形例として、図
４（ｂ）に示すように、気密容器１全体を真空チャンバ
ー１３内に保持し、気密容器１内にトレーサーガスとし
てヘリウムガスを充填した状態で、真空ポンプ１１によ
り真空チャンバー１３を真空引きして、ヘリウムガスの
バルブ３等からの漏洩をヘリウムリーク検出器７で検出
するものもある。(2) Helium Leak Test The second inspection method shown in FIG.
Helium gas, which is stable with respect to F 6 , is charged as a tracer gas. Then, a jig 8 is attached to the convex curved end surface of the airtight container 1 in an airtight state so as to cover almost the entire area of the end surface, and an airtight closed space 9 is formed around the valve 3 and the closed space 9 is formed. A helium leak detector 7 is connected to the via a pipe 10. The closed space 9 is evacuated to a vacuum by the vacuum pump 11 to prevent the helium gas from leaking from the valve 3 of the airtight container 1 into the closed space 9 due to the pressure difference.
A helium leak detector 7 detects the leak through the pipe 10. As a modified example of FIG. 4 (a), as shown in FIG. 4 (b), the whole airtight container 1 is held in a vacuum chamber 13, and the airtight container 1 is filled with helium gas as a tracer gas. In some cases, the vacuum chamber 13 is evacuated by the vacuum pump 11 and the helium leak detector 7 detects the leak of the helium gas from the valve 3 or the like.
【０００６】（３）ＵＦ6漏れ試験
図５に示すように、気密容器１内のＵＦ6から昇華して
くるＵＦ6ガス自体をトレーサーとして用いる漏洩試験
方法。すなわち、バルブ３の周囲に形成した気密の閉鎖
空間９に、配管１４を介してＵＦ6ガス濃度計１５を接
続するとともに、この閉鎖空間９内を配管１０を介して
真空ポンプ１１により真空引きする。気密容器１内と閉
鎖空間９内との圧力差により、バルブ３から漏洩するＵ
Ｆ6ガスが閉鎖空間９内に充填され、この閉鎖空間９内
のＵＦ6ガスの濃度が、検知しようとするＵＦ6ガスの漏
洩率に相当する濃度になったか否かで検査する。(3) UF 6 leak test As shown in FIG. 5, a leak test method using the UF 6 gas itself sublimated from UF 6 in the airtight container 1 as a tracer. That is, the UF 6 gas concentration meter 15 is connected to the airtight closed space 9 formed around the valve 3 via the pipe 14, and the inside of the closed space 9 is evacuated by the vacuum pump 11 via the pipe 10. . U leaking from the valve 3 due to the pressure difference between the airtight container 1 and the closed space 9
The F 6 gas is filled in the closed space 9, and it is inspected whether or not the concentration of the UF 6 gas in the closed space 9 has reached a concentration corresponding to the leak rate of the UF 6 gas to be detected.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記
（１）、（２）および（３）の従来技術のものは、以下
に記載するような問題点がある。
（１）石鹸泡検査では、前もって気密容器内に加圧用ガ
スを封入して所定の圧力まで加圧しなければならないた
め、気密容器内部に不純物が混入する上に、検査終了後
に加圧用ガスを取り除かねばならず、検査工程が増加し
て検査コストや検査時間の増大につながる。なお、検査
後に加圧用ガスを取り除かないと、気密容器を検査後加
圧状態で取扱い、輸送することになり、この方法を採用
することは難しい。However, the above-mentioned prior arts (1), (2) and (3) have the following problems. (1) In the soap bubble inspection, the gas for pressurization must be enclosed in the airtight container in advance to pressurize it to a predetermined pressure. Therefore, impurities must be mixed in the airtight container, and the gas for pressurization must be removed after the inspection is completed. This necessitates an increase in the number of inspection processes, leading to an increase in inspection cost and inspection time. If the pressurizing gas is not removed after the inspection, the airtight container will be handled and transported in a pressurized state after the inspection, and it is difficult to adopt this method.
【０００８】（２）ヘリウムリーク試験は、気密容器内
に異物であるヘリウムを封入しなければならず、封入圧
力は大気圧以下でよいので上記のような加圧問題は回避
されるが、やはり、この方法でも、不純物の混入という
問題があり、気密容器の発送前の検査等としては必ずし
も最良の方法ではない。また、高価なヘリウムリーク検
出器が必要なので、装置コストが嵩む。(2) In the helium leak test, helium, which is a foreign substance, must be sealed in an airtight container, and the sealing pressure can be atmospheric pressure or lower, so the above-mentioned pressurization problem can be avoided, but still However, this method also has a problem of mixing impurities, and is not necessarily the best method as an inspection before shipping the airtight container. Moreover, since an expensive helium leak detector is required, the device cost increases.
【０００９】（３）ＵＦ6漏れ試験は、上記（１）、
（２）のようなデメリットは少ないが、やはり、ＵＦ6
ガスをＵＦ6ガス濃度計に導入するまでにＵＦ6の配管へ
の吸着等の可能性があるので、それを考慮した補正が必
要となる難点を持つ。また、高価なＵＦ6ガス濃度計が
必要なので、装置コストが嵩む。(3) The UF 6 leak test is conducted according to the above (1),
There are few disadvantages like (2), but again UF 6
There is a possibility that UF 6 may be adsorbed on the piping before it is introduced into the UF 6 gas concentration meter, so there is a difficulty in that correction must be taken into consideration. Moreover, since an expensive UF 6 gas concentration meter is required, the cost of the apparatus increases.
【００１０】本発明は、上記従来技術の有する問題点に
鑑みてなされたものであり、気密容器内にトレーサーガ
スを充填したり、気密容器を加圧したりすることなく、
六弗化ウランガスの漏洩を短時間でかつ高精度に検査で
きる上に、検査を実施するための装置コストも嵩まな
い、六弗化ウランガスの漏洩検査方法を提供することを
目的としている。The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to fill the airtight container with a tracer gas or pressurize the airtight container,
It is an object of the present invention to provide a uranium hexafluoride gas leakage inspection method which can inspect a leakage of uranium hexafluoride gas in a short time and with high accuracy and at the same time does not increase the cost of the apparatus for performing the inspection.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
の本発明は、六弗化ウランガスを含む物質が充填されか
つ内圧が負圧とされた気密容器の、弁体からの六弗化ウ
ランガスの漏洩を検出する漏洩検査方法において、前記
弁体の前記漏洩の可能性のある部位に、六弗化ウランガ
ス呈色検知体を配置するとともに、前記弁体の周囲に、
前記気密容器の内圧より低圧に制御された気密の閉鎖空
間を形成し、前記閉鎖空間に漏洩してきた六弗化ウラン
ガスを前記六弗化ウランガス呈色検知体により検知する
ことを特徴とするものである。本発明の作用としては、
六弗化ウランガス呈色検知体をバルブ（あるいはプラ
グ）の漏洩の可能性のある部位を覆うように配置し、さ
らに、閉鎖空間内を充分な低圧（気密容器内圧より充分
低圧であればよい）に保つ。気密容器内から閉鎖空間に
漏洩してきたＵＦ6ガスは、六弗化ウランガス呈色検知
体を呈色させるので、ＵＦ6ガスの漏洩を検出できる。Means for Solving the Problems The present invention for achieving the above object is to provide uranium hexafluoride gas from a valve body of an airtight container filled with a substance containing uranium hexafluoride gas and having a negative internal pressure. In the leakage inspection method for detecting the leakage of, the uranium hexafluoride gas color detection body is arranged at the portion of the valve body where there is a possibility of leakage, and around the valve body,
An airtight closed space controlled to a pressure lower than the internal pressure of the airtight container is formed, and uranium hexafluoride gas leaking into the closed space is detected by the uranium hexafluoride gas color detector. is there. The operation of the present invention is as follows.
The uranium hexafluoride gas color detector is placed so as to cover the potentially leaking part of the valve (or plug), and the inside of the closed space has a sufficiently low pressure (it should be sufficiently lower than the pressure inside the airtight container). Keep on. The UF 6 gas leaking from the airtight container to the closed space causes the uranium hexafluoride gas color detector to develop a color, so that the leakage of the UF 6 gas can be detected.
【００１２】また、前記六弗化ウランガス呈色検知体と
してＨＦ検知紙を用い、ＵＦ6ガスが前記ＨＦ検知紙中
の水分と反応することにより生成されたＨＦが、前記Ｈ
Ｆ検知紙を呈色させることにより、ＵＦ6ガスの漏洩を
検出する。さらに、前記閉鎖空間を低圧に保持する時間
は、検知すべきＵＦ6ガスの漏洩率、前記弁体の漏洩の
可能性のある部位の表面積、および前記ＨＦ検知紙の感
度によって設定する。そして、前記ＨＦ検知紙は、漏洩
してきたＵＦ6ガスの全量を吸収するように配置して、
その絶対量を捕らえる。ここで、前記ＨＦ検知紙のα線
計測や化学分析等を行うことにより、漏洩ガスの厳密な
定量評価も可能である。さらに加えて、前記ＨＦ検知紙
は、低圧の閉鎖空間内でも水分を失わないように保水性
を有する。Further, HF detection paper is used as the uranium hexafluoride gas color detector, and HF generated by reacting UF 6 gas with water in the HF detection paper is
By leaking the F-detection paper, the leak of UF 6 gas is detected. Further, the time for keeping the closed space at a low pressure is set by the leak rate of the UF 6 gas to be detected, the surface area of the valve body where there is a possibility of leakage, and the sensitivity of the HF detection paper. Then, the HF detection paper is arranged so as to absorb all the leaked UF 6 gas,
Capture the absolute amount. Here, strict quantitative evaluation of the leaked gas is possible by performing α-ray measurement or chemical analysis of the HF detection paper. In addition, the HF detection paper has water retention property so as not to lose water even in a low pressure closed space.
【００１３】[0013]
【発明の実施の形態】次に、本発明の一実施形態につい
て図面を参照して説明する。図１は本発明に係わるＵＦ
6ガスの漏洩検査方法の一実施形態を実施するための装
置の概略図、図２は図１に示したバルブの近傍の拡大図
である。なお、上述の従来技術と同様の部材または部品
には同一の符号を用いて、その説明は省略する。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a UF according to the present invention.
FIG. 2 is a schematic view of an apparatus for carrying out one embodiment of a method for inspecting 6- gas leakage, and FIG. 2 is an enlarged view of the vicinity of the valve shown in FIG. The same members or parts as those in the above-mentioned conventional technique are designated by the same reference numerals, and the description thereof will be omitted.
【００１４】図１（ａ）に示すように、気密容器１の漏
洩可能性のある部分にスカート部５と治具８をかぶせ、
その中を閉鎖空間９とする。この閉鎖空間９に配管１０
によって真空ポンプ１１を接続する。なお、治具８によ
り気密容器１の端面のほぼ全体を覆って閉鎖空間９を形
成する構成としたが、これに代えて、図１（ｂ）に示す
ように、バルブ３の周囲のみに閉鎖空間９０を形成する
ために、小型の治具１７を用いて気密容器１の端面の一
部を気密状態で覆うようにしてもよい。治具８を用いて
閉鎖空間９を形成するに先立って、図２に示すように、
バルブ３の、ＵＦ6ガスの漏洩の可能性のある部位を覆
うように、ＨＦ検知紙（六弗化ウランガス呈色検知体）
２０ａ，２０ｂ，２０ｃを貼り付けて配置する。なお、
本実施形態では、バルブ３の底部、側部および上部の全
てにＨＦ検知紙２０ａ，２０ｂ，２０ｃが配置されてい
るが、こらに限らず、これらの内のいずれか１つの部位
や、あるいは他の部位でもよい。As shown in FIG. 1 (a), a skirt portion 5 and a jig 8 are placed on the leaktight portion of the airtight container 1,
The inside is referred to as a closed space 9. Piping 10 in this closed space 9
The vacuum pump 11 is connected by. The jig 8 covers almost the entire end face of the airtight container 1 to form the closed space 9, but instead of this, as shown in FIG. 1B, the closed space is closed only around the valve 3. In order to form the space 90, a small jig 17 may be used to cover a part of the end face of the airtight container 1 in an airtight state. Prior to forming the closed space 9 using the jig 8, as shown in FIG.
HF detection paper (uranium hexafluoride gas color detection body) so as to cover the portion of valve 3 where UF 6 gas may leak.
20a, 20b, 20c are attached and arranged. In addition,
In the present embodiment, the HF detection papers 20a, 20b, 20c are arranged on all of the bottom portion, side portions and upper portion of the valve 3, but the present invention is not limited to these, and any one of these portions or other portions. It may be part of.
【００１５】真空ポンプ１１により閉鎖空間９内を低圧
（気密容器１内圧より充分低圧であればよい）にし、こ
れを一定時間保持する。例えばバルブ３の底部から閉鎖
空間９に漏洩してきたＵＦ6ガスの全量はＨＦ検知紙２
０ａに含まれる水分と反応し、以下の化学反応式が進行
して、速やかにＵＯ2Ｆ2とＨＦとが生成される。こうし
て生成したＨＦがＨＦ検知紙２０ａをピンク色に呈色さ
せる。また、ＨＦ検知紙２０ａ上で生成したＵＯ2Ｆ2は
固体なので、ＨＦ検知紙２０ａ上にトラップされる。
ＵＦ6＋２Ｈ2Ｏ→ＵＯ2Ｆ2＋４ＨＦ
なお、ＨＦ検知紙２０ａ（２０ｂ，２０ｃ）は、低圧の
閉鎖空間９内でも水分を失わないように充分な保水性を
有しており、本例では、理研機器株式会社製のＦＴ−０
０６（品番）を用いた。The inside of the closed space 9 is made to have a low pressure (the pressure is sufficiently lower than the internal pressure of the airtight container 1) by the vacuum pump 11, and this is maintained for a certain period of time. For example, the total amount of UF 6 gas that has leaked from the bottom of the valve 3 to the closed space 9 is HF detection paper 2
It reacts with the water contained in 0a, the following chemical reaction formula proceeds, and UO 2 F 2 and HF are rapidly produced. The HF thus generated causes the HF detection paper 20a to be colored pink. Further, since the UO 2 F 2 generated on the HF detection paper 20a is solid, it is trapped on the HF detection paper 20a. UF 6 + 2H 2 O → UO 2 F 2 + 4HF The HF detection paper 20a (20b, 20c) has sufficient water retention so as not to lose water even in the low-pressure closed space 9, and in this example, , FT-0 manufactured by Riken Kikai Co., Ltd.
06 (product number) was used.
【００１６】閉鎖空間９内を低圧に保持する時間（ＵＦ
6ガスが閉鎖空間９内に漏洩し得る時間）は、検知すべ
きＵＦ6ガスの漏洩率、漏洩の可能性のある箇所の表面
積（ＨＦ検知紙２０ａで覆うべき表面積）、およびＨＦ
検知紙２０ａの感度から設定する。例えば、１×１０3
ｓｔｄ・ｃｃ／ｓの漏洩を検出したい場合、１×１０3
ｓｔｄ・ｃｃ／ｓをＵＦ6の漏洩率に換算し、さらにウ
ランのグラム数に直すと、２．７×１０-7ｇＵ／ｓとな
る。ＨＦ検知紙２０ａの感度（市販品の代表値）をＵＦ
6に換算したものを３×１０-6ｇＵ／ｃｍ2とする。ＨＦ
検知紙２０ａが覆う表面積を１０ｃｍ2とすると、閉鎖
空間９内を低圧に保持すべき時間は、式３×１０-6ｇＵ
／ｃｍ2×１０ｃｍ2÷２．７×１０-7ｇＵ／ｓにより求
められて、１１１秒＝約２分となる。このように、閉鎖
空間９内を低圧空間に保持する時間を設定でき、短時間
での検査が可能である。Time for keeping the closed space 9 at a low pressure (UF
The time period during which the 6 gas can leak into the closed space 9 is determined by the leak rate of the UF 6 gas to be detected, the surface area of the potential leak point (the surface area to be covered with the HF detection paper 20a), and the HF.
It is set from the sensitivity of the detection paper 20a. For example, 1 × 10 3
If you want to detect leakage of std / cc / s, 1 × 10 3
If std · cc / s is converted into the leakage rate of UF 6 and further converted into the number of grams of uranium, it becomes 2.7 × 10 −7 gU / s. The sensitivity of the HF detection paper 20a (representative value of a commercial product) is UF
The value converted into 6 is 3 × 10 −6 gU / cm 2 . HF
Assuming that the surface area covered by the detection paper 20a is 10 cm 2 , the time to keep the closed space 9 at a low pressure is calculated by the formula 3 × 10 −6 gU.
/ Cm 2 × 10 cm 2 ÷ 2.7 × 10 -7 gU / s gives 111 seconds = about 2 minutes. In this way, the time for keeping the closed space 9 in the low pressure space can be set, and the inspection can be performed in a short time.
【００１７】上記のようにＨＦ検知紙２０ａの呈色でＵ
Ｆ6ガスの漏洩の有無を判断する。さらに、漏洩したガ
スの厳密な定量が必要な場合には、バルブ３から取り外
したＨＦ検知紙２０ａを水に浸し、ＵＯ2Ｆ2を溶出させ
た溶液をα線計測や化学分析等にかけることにより、定
量を行う。As described above, the color of the HF detection paper 20a causes U
Determine if F 6 gas is leaking. Further, when a strict quantification of the leaked gas is required, the HF detection paper 20a removed from the valve 3 should be dipped in water, and the solution in which UO 2 F 2 was eluted should be subjected to α-ray measurement or chemical analysis. Quantify by
【００１８】以上のように、本実施形態の漏洩検査方法
は、従来のような気密容器１内への加圧用ガスやヘリウ
ムを封入することに起因する、気密容器内への不純物の
混入の問題や、検査終了後に気密容器内から加圧用ガス
を取り除く工程を不要とするために、気密容器１内のＵ
Ｆ6ガスをトレーサーとして使用する。また、ＨＦ検知
紙２０ａの呈色により、漏洩の有無を簡単かつ迅速に確
認できる。さらに、従来のようなＵＦ6の配管への吸着
を避けるため、ＵＦ6ガスを検知するＨＦ検知紙２０ａ
を直接、漏洩の可能性のある部位に配置し、極微量漏洩
してくるＵＦ6ガスを全量トラップすることができる。
ＨＦ検知紙２０ａの呈色具合により漏洩量の定量が可能
であるが、厳密な漏洩の定量的評価が必要な場合には、
ＨＦ検知紙２０ａのウランをα線計測や化学分析等で定
量する。As described above, the leakage inspection method of the present embodiment has a problem that impurities are mixed into the airtight container 1 due to enclosing the pressurized gas or helium in the airtight container 1 as in the conventional case. In addition, in order to eliminate the step of removing the pressurizing gas from the airtight container after the inspection is completed, the U in the airtight container 1 is eliminated.
F 6 gas is used as a tracer. Further, the presence or absence of leakage can be easily and quickly confirmed by the coloration of the HF detection paper 20a. Further, in order to avoid the conventional adsorption of UF 6 to the pipe, the HF detection paper 20a for detecting UF 6 gas is used.
Can be directly placed at a site where there is a possibility of leakage, and the UF 6 gas that leaks in an extremely small amount can be trapped entirely.
The amount of leakage can be quantified by the coloration of the HF detection paper 20a, but if strict quantitative evaluation of leakage is required,
Uranium in the HF detection paper 20a is quantified by α ray measurement, chemical analysis, or the like.
【００１９】なお、バルブ３とプラグ４は弁体を構成す
るが、本明細書でいう弁体は、バルブ３とプラグ４に限
定されることなく、気密容器１のＵＦ6ガスの漏洩可能
な部位の総称であるものとする。Although the valve 3 and the plug 4 constitute a valve body, the valve body in this specification is not limited to the valve 3 and the plug 4, and the UF 6 gas in the airtight container 1 can leak. It shall be a generic term for parts.
【００２０】[0020]
【発明の効果】本発明は、以上説明したとおりに構成さ
れているので、以下に記載するような効果を奏する。気
密容器内を加圧する必要がなく、ヘリウムを充填する必
要もないので、気密容器の発送前に、六弗化ウランガス
（ＵＦ6ガス）の漏洩検査を容易に行うことができる。
ＵＦ6ガス漏洩の有無は、六弗化ウランガス呈色検知体
（例えばＨＦ検知紙）の呈色により簡単かつ正確に判断
できる。大規模な検査装置を用いずに、簡単かつ短時間
で漏洩検査を行える。漏洩したＵＦ6ガスの全量を容易
にトラップすることができるので、厳密な定量評価が必
要な場合（万が一、ＨＦ検知紙が呈色した場合など）
に、六弗化ウランガス呈色検知体をα線計測や化学分析
等にかけることにより、定量評価が可能である。Since the present invention is configured as described above, it has the following effects. Since it is not necessary to pressurize the inside of the airtight container and to fill it with helium, it is possible to easily perform a leak inspection of uranium hexafluoride gas (UF 6 gas) before shipping the airtight container.
The presence / absence of UF 6 gas leakage can be easily and accurately determined by the color of the uranium hexafluoride gas color detector (for example, HF detection paper). Leak inspection can be performed easily and in a short time without using a large-scale inspection device. Since all the leaked UF 6 gas can be easily trapped, strict quantitative evaluation is necessary (by any chance, if the HF detection paper is colored).
In addition, quantitative evaluation is possible by subjecting the uranium hexafluoride gas color detector to α-ray measurement, chemical analysis and the like.
【図１】 本発明に係わるＵＦ6ガスの漏洩検査方法の
一実施形態を実施するための装置の概略図である。FIG. 1 is a schematic view of an apparatus for carrying out an embodiment of a leakage inspection method for UF 6 gas according to the present invention.
【図２】 図１に示したバルブの近傍の拡大図である。FIG. 2 is an enlarged view of the vicinity of the valve shown in FIG.
【図３】 従来のＵＦ6ガスの漏洩検査方法を説明する
ための、気密容器の概略図である。FIG. 3 is a schematic view of an airtight container for explaining a conventional leakage inspection method for UF 6 gas.
【図４】 他の従来のＵＦ6ガスの漏洩検査方法を説明
するための、気密容器および検査装置の概略図である。FIG. 4 is a schematic view of an airtight container and an inspection device for explaining another conventional leakage inspection method for UF 6 gas.
【図５】 さらに従来のＵＦ6ガスの漏洩検査方法を説
明するための、気密容器および検査装置の概略図であ
る。FIG. 5 is a schematic view of an airtight container and an inspection device for explaining a conventional UF 6 gas leakage inspection method.
１ 気密容器
２ 本体
３ バルブ
４ プラグ
５，６ スカート部
７ ヘリウムリーク検出器
８ 治具
９，９０ 閉鎖空間
１０，１４ 配管
１１ 真空ポンプ
１３ 真空チャンバー
１５ ＵＦ6ガス濃度計
１７ カップ状の治具
２０ａ，２０ｂ，２０ｃ ＨＦ検知紙（六弗化ウランガ
ス呈色検知体）1 Airtight container 2 Main body 3 Valve 4 Plug 5, 6 Skirt part 7 Helium leak detector 8 Jig 9, 90 Closed space 10, 14 Piping 11 Vacuum pump 13 Vacuum chamber 15 UF 6 Gas concentration meter 17 Cup-shaped jig 20a , 20b, 20c HF detector paper (uranium hexafluoride gas color detector)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮澤 隆 東京都文京区小石川１−３−25 小石川 大国ビル 三菱マテリアル株式会社 原 子力事業センター内 (56)参考文献 特開 平７−72138（ＪＰ，Ａ) 実開 昭58−75724（ＪＰ，Ｕ) 実開 昭59−90697（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B65D 88/00 - 90/66 G01N 31/00 - 31/22 G21F 9/00 - 9/36 C01G 43/00 - 43/12 F17C 1/00 - 13/12 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Miyazawa 1-3-25 Koishikawa, Bunkyo-ku, Tokyo Koishikawa Daikoku Building Mitsubishi Materials Corporation, Harajiki Business Center (56) Reference JP-A-7-72138 (JP , A) Actual development Sho 58-75724 (JP, U) Actual development Sho 59-90697 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) B65D 88/00-90/66 G01N 31/00-31/22 G21F 9/00-9/36 C01G 43/00-43/12 F17C 1/00-13/12
Claims (6)
かつ内圧が負圧とされた気密容器の、弁体からの六弗化
ウランガスの漏洩を検出する漏洩検査方法において、 前記弁体の前記漏洩の可能性のある部位に、六弗化ウラ
ンガス呈色検知体を配置するとともに、前記弁体の周囲
に、前記気密容器の内圧より低圧に制御された気密の閉
鎖空間を形成し、 前記閉鎖空間に漏洩してきた六弗化ウランガスを前記六
弗化ウランガス呈色検知体により検知することを特徴と
する六弗化ウランガスの漏洩検査方法。1. A leak inspection method for detecting a leak of uranium hexafluoride gas from a valve body of an airtight container filled with a substance containing uranium hexafluoride gas and having a negative internal pressure, wherein: A uranium hexafluoride gas color detection body is arranged at a potential leak site, and an airtight closed space controlled to a pressure lower than the internal pressure of the airtight container is formed around the valve body to close the valve. A method for inspecting leakage of uranium hexafluoride gas, characterized in that the uranium hexafluoride gas leaking into the space is detected by the uranium hexafluoride gas color detector.
ＨＦ検知紙を用い、六弗化ウランガスが前記ＨＦ検知紙
中の水分と反応することにより生成されたＨＦが、前記
ＨＦ検知紙を呈色させることにより、六弗化ウランガス
の漏洩を検出する請求項１に記載の六弗化ウランガスの
漏洩検査方法。2. An HF detection paper is used as the uranium hexafluoride gas coloration detector, and HF generated by the reaction of the uranium hexafluoride gas with the water in the HF detection paper presents the HF detection paper. The uranium hexafluoride gas leakage inspection method according to claim 1, wherein the leakage of the uranium hexafluoride gas is detected by coloring.
検知すべき六弗化ウランガスの漏洩率、前記弁体の漏洩
の可能性のある部位の表面積、および前記ＨＦ検知紙の
感度によって設定する請求項２に記載の六弗化ウランガ
スの漏洩検査方法。3. The time for maintaining the closed space at a low pressure is
The leakage inspection method for uranium hexafluoride gas according to claim 2, wherein the leakage rate of the uranium hexafluoride gas to be detected, the surface area of the portion of the valve body where there is a possibility of leakage, and the sensitivity of the HF detection paper are set.
ウランガスの全量を吸収するように配置して、その絶対
量を捕らえる請求項２または請求項３に記載の六弗化ウ
ランガスの漏洩検査方法。4. The leakage of uranium hexafluoride gas according to claim 2 or 3, wherein the HF detection paper is arranged so as to absorb the total amount of the leaked uranium hexafluoride gas and captures the absolute amount thereof. Inspection method.
を行うことにより、漏洩ガスの定量評価を行う請求項４
に記載の六弗化ウランガスの漏洩検査方法。5. The leak gas is quantitatively evaluated by performing α-ray measurement or chemical analysis of the HF detection paper.
The leak inspection method for uranium hexafluoride gas described in 1.
も水分を失わないように保水性を有する請求項２乃至請
求項５のいずれか１項に記載の六弗化ウランガスの漏洩
検査方法。6. The leak detection method for uranium hexafluoride gas according to claim 2, wherein the HF detection paper has water retention property so as not to lose water even in a low-pressure closed space. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01168997A JP3427657B2 (en) | 1997-01-24 | 1997-01-24 | Inspection method for uranium hexafluoride gas leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01168997A JP3427657B2 (en) | 1997-01-24 | 1997-01-24 | Inspection method for uranium hexafluoride gas leakage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10211992A JPH10211992A (en) | 1998-08-11 |
| JP3427657B2 true JP3427657B2 (en) | 2003-07-22 |
Family
ID=11785004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01168997A Expired - Fee Related JP3427657B2 (en) | 1997-01-24 | 1997-01-24 | Inspection method for uranium hexafluoride gas leakage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3427657B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6765221B2 (en) * | 2001-04-23 | 2004-07-20 | Westinghouse Electric Company, Llc | Method and apparatus for shipping substantially pure uranium hexafluoride |
| JP5530791B2 (en) * | 2010-04-20 | 2014-06-25 | 株式会社初田製作所 | Pressure accumulating fire extinguisher manufacturing method, leak measuring system and leak measuring method |
| JP6148824B2 (en) * | 2011-05-11 | 2017-06-14 | モリタ宮田工業株式会社 | Fire extinguisher leak inspection device and inspection method |
| CN106932234A (en) * | 2015-12-31 | 2017-07-07 | 中核建中核燃料元件有限公司 | A kind of UF6Gas leak detection sampling monitoring device and method |
| WO2018008790A2 (en) * | 2016-07-08 | 2018-01-11 | 한전원자력연료 주식회사 | System and method for detecting uranium hexafluoride (uf6) leak |
| KR102065771B1 (en) * | 2018-06-26 | 2020-01-13 | 한전원자력연료 주식회사 | UF6 leakage detecting system for the nuclear fuel fabrication |
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1997
- 1997-01-24 JP JP01168997A patent/JP3427657B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10211992A (en) | 1998-08-11 |
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