JP2006010355A - System of tagging gas enclosure to internal pressure creep test piece - Google Patents

System of tagging gas enclosure to internal pressure creep test piece Download PDF

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JP2006010355A
JP2006010355A JP2004184212A JP2004184212A JP2006010355A JP 2006010355 A JP2006010355 A JP 2006010355A JP 2004184212 A JP2004184212 A JP 2004184212A JP 2004184212 A JP2004184212 A JP 2004184212A JP 2006010355 A JP2006010355 A JP 2006010355A
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gas
internal pressure
test piece
creep test
tag
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JP3822886B2 (en
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Shoichi Ichikawa
正一 市川
Yasuhiro Abe
康弘 阿部
Toshiaki Endo
敏明 遠藤
Takeshi Omori
雄 大森
Yasutoshi Kojima
保俊 小島
Hiroshi Okazawa
博 岡澤
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KOATSU SYSTEM KK
Japan Atomic Energy Agency
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KOATSU SYSTEM KK
Japan Nuclear Cycle Development Institute
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To reduce much waste of tagging gas and reduce the manufacturing cost of an internal pressure creep test piece by uniformly mixing the tagging gas and internal pressure loading gas, exactly grasping their mixing fractions and exactly calculating internal stress at high temperature. <P>SOLUTION: The internal pressure creep test piece 24 is placed in enclosure vessels 10, 12, the tag gas and internal pressure loading gas are introduced into the enclosure vessels and filled in the internal pressure creep test piece, and a gas introducing hole of the internal pressure creep test piece is sealed with laser welding. Here, in the front step of the enclosure vessel, a mixer 14 which is provided with a stirring function and variable inner volume is placed. The tagging gas and the internal pressure loading gas are separately introduced in the mixer and high pressure mixture gas is compressed into the enclosure vessel by a plunger for injecting in a mixing room. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、内圧クリープ試験片内へタグガスと内圧負荷ガスを封入する装置に関し、更に詳しく述べると、高価なタグガスを無駄なく使用でき、タグガスと内圧負荷ガスが均一に混合した状態で充填されるように工夫した内圧クリープ試験片へのタグガス封入装置に関するものである。   The present invention relates to an apparatus for enclosing a tag gas and an internal pressure load gas in an internal pressure creep test piece. More specifically, the expensive tag gas can be used without waste, and the tag gas and the internal pressure load gas are filled in a uniformly mixed state. The present invention relates to a tag gas sealing device for an internal pressure creep test piece devised as described above.

高速実験炉「常陽」では、燃料被覆管の実環境下における高温強度特性を評価するために、内圧クリープ試験が行われている。この試験では、室内温度で所定の内圧となるように高圧ガスを封入した円筒状の内圧クリープ試験片（燃料被覆管材料）を照射キャプセル内に収納し、それを原子炉に装荷する。原子炉温度の上昇に伴い内圧クリープ試験片の内圧は上昇し、内圧は運転期間中一定に保持される。その結果、内圧クリープ試験片は次第に膨らみ、やがて破断に至る。高温強度特性の評価では、内圧と試験片破断時間の関係を得る必要がある。   In the fast experimental reactor “Joyo”, an internal pressure creep test is performed to evaluate the high-temperature strength characteristics of the fuel cladding tube in an actual environment. In this test, a cylindrical internal pressure creep test piece (fuel cladding tube material) filled with high-pressure gas so as to have a predetermined internal pressure at room temperature is stored in an irradiation capsule and loaded into a nuclear reactor. As the reactor temperature rises, the internal pressure of the internal pressure creep specimen increases, and the internal pressure is kept constant during the operation period. As a result, the internal pressure creep test piece gradually expands and eventually breaks. In the evaluation of the high temperature strength characteristics, it is necessary to obtain the relationship between the internal pressure and the test piece breaking time.

原子炉内での内圧クリープ試験においては、内圧クリープ試験片の内圧負荷ガスに、通常、ヘリウム（Ｈｅ）ガスを用いており、原子炉内での内圧クリープ試験片の破断は、照射キャプセルに付属した温度センサ（特許文献１）やボイド計（特許文献２）により検知している。しかし、原子炉運転中に複数の内圧クリープ試験片が破断した場合には、そのままでは破断試験片の判別ができない。そこで、高速実験炉「常陽」では、タグガス分析装置を導入し、内圧クリープ試験片の破断の際に放出されるガスを分析することによって破断試験片を同定できるシステムが導入されている。   In the internal pressure creep test in the nuclear reactor, helium (He) gas is usually used as the internal pressure load gas of the internal pressure creep test piece, and fracture of the internal pressure creep test piece in the nuclear reactor is attached to the irradiation capsule. The temperature sensor (Patent Document 1) and the void meter (Patent Document 2) are used for detection. However, when a plurality of internal pressure creep test pieces break during the operation of the nuclear reactor, the break test pieces cannot be distinguished as they are. Therefore, in the fast experimental reactor “Joyo”, a system that can identify a fracture test piece by introducing a tag gas analyzer and analyzing a gas released when the internal pressure creep test piece breaks is introduced.

なお、「タグガス」とは、キセノンガスやクリプトンガスの天然の同位体を任意の同位体組成比に調整した特殊なガスのことである。このタグガスは、現時点において国内では入手できず、製造の困難さから非常に高価なものとなっている。   The “tag gas” is a special gas in which natural isotopes of xenon gas and krypton gas are adjusted to an arbitrary isotope composition ratio. This tag gas is not currently available in the country and is very expensive due to difficulty in manufacturing.

内圧クリープ試験片へ高圧ガスを封入するには、高圧ガス保安法に基づき設計・製作した高圧ガス機器配管システムを使用し、封入容器内に内圧クリープ試験片を設置して、封入容器内部を高圧ガス雰囲気とし、内圧クリープ試験片のガス封入孔をＹＡＧレーザ溶接機にて塞ぐことで、内圧クリープ試験片内部を高圧ガス雰囲気とする。タグガスを封入するには、封入容器に内圧クリープ試験片を設置して封入容器内にタグガスを導入する。タグガスのみで封入容器内を最大２０ＭＰａに加圧すると無駄なタグガスが多くなるため、通常、内圧クリープ試験片には破断の検知に必要な量のみとして約５×１０-6ｍ3 のタグガスを入れ、残りをＨｅガスで加圧する。 To enclose high-pressure gas in the internal pressure creep test piece, use a high-pressure gas equipment piping system designed and manufactured based on the high-pressure gas safety method, install the internal pressure creep test piece inside the enclosure, The inside of the internal pressure creep test piece is changed to a high pressure gas atmosphere by closing the gas filling hole of the internal pressure creep test piece with a YAG laser welder. In order to enclose the tag gas, an internal pressure creep test piece is installed in the enclosure and the tag gas is introduced into the enclosure. When the inside of the sealed container is pressurized to a maximum of 20 MPa with only the tag gas, the amount of wasted tag gas increases. Usually, about 5 × 10 −6 m 3 of tag gas is put into the internal pressure creep test piece only as the amount necessary for detecting the breakage. The remainder is pressurized with He gas.

しかし、従来技術では、
（１）封入容器に先ず必要な量のタグガスを入れ、次にＨｅガスで加圧し、所定の内圧にして内圧クリープ試験片のガス封入孔を溶封すると、ガスの圧縮性の違いから内圧クリープ試験片内部にはタグガスが優先的に入り、均一な混合ガスにならない。
（２）タグガスとＨｅガスでは熱膨張係数が異なるため、高温時の内部応力を算出するには、内圧クリープ試験片に封入するタグガスとＨｅガスの割合を正確に把握する必要があるが、それができない。
（３）高圧ガス用の封入容器や連結配管などに余分な空間が多く存在し、その余分な空間がガス溜まりとなるため、タグガスを無駄に消費することになり、その結果、内圧クリープ試験片製作コストが上昇する。
などの技術的課題が生じた。
特開２００３−１２１５８９２号公報 特開平９−１４５９８１号公報 However, in the prior art,
(1) Put the required amount of tag gas into the sealed container, then pressurize with He gas, and then seal the gas sealed hole of the internal pressure creep test piece to the specified internal pressure, then the internal pressure creep due to the difference in gas compressibility Tag gas enters preferentially inside the test piece and does not become a uniform mixed gas.
(2) Since the coefficient of thermal expansion differs between tag gas and He gas, to calculate the internal stress at high temperatures, it is necessary to accurately grasp the ratio of tag gas and He gas enclosed in the internal pressure creep test specimen. I can't.
(3) Since there is a lot of extra space in the high-pressure gas enclosure or connecting pipe, and the extra space becomes a gas reservoir, the tag gas is wasted, resulting in an internal pressure creep test piece. Production costs increase.
Technical issues such as that occurred.
JP 2003-1215892 A JP-A-9-145981

本発明が解決しようとする課題は、従来技術では、タグガスとＨｅガス等とを均一な混合ガスとして内圧クリープ試験片へ封入できない点、そのためタグガスとＨｅガス等の割合を正確に把握できない点、ガス溜まりが多くできてタグガスが無駄になる点、などである。   The problem to be solved by the present invention is that, in the prior art, the tag gas and He gas etc. cannot be enclosed in the internal pressure creep test piece as a uniform mixed gas, so that the ratio of the tag gas and He gas etc. cannot be accurately grasped, There are many gas pools and tag gas is wasted.

本発明は、内圧クリープ試験片を封入容器内に設置し、タグガスと内圧負荷ガスを該封入容器内に導いて内圧クリープ試験片内に充填し、レーザ溶接により内圧クリープ試験片のガス封入孔を封止する装置において、前記封入容器の前段に、攪拌機能を備えた内容積可変型の混合器を設置し、タグガスと内圧負荷ガスを別々に混合器の混合室に導き、該混合室に圧入するプランジャにより高圧混合ガスが封入容器に圧送されるようにしたことを特徴とする内圧クリープ試験片へのタグガス封入装置である。ここで、内圧負荷ガスとしては、ヘリウムガスやアルゴンガスなどを用いる。   In the present invention, an internal pressure creep test piece is installed in a sealed container, a tag gas and an internal pressure load gas are introduced into the sealed container, and the internal pressure creep test piece is filled, and a gas sealed hole of the internal pressure creep test piece is formed by laser welding. In the sealing device, an internal volume variable type mixer equipped with a stirring function is installed in front of the enclosed container, and the tag gas and the internal pressure load gas are separately introduced into the mixing chamber of the mixer and press-fitted into the mixing chamber. A tag gas sealing device for an internal pressure creep test piece, characterized in that a high-pressure mixed gas is pumped to a sealed container by a plunger that performs the above operation. Here, helium gas or argon gas is used as the internal pressure load gas.

本発明では、内圧クリープ試験片が嵌入し且つ封入容器内に嵌入する試験片固定用ホルダを使用し、該試験片固定用ホルダには外周面に軸方向及び円周方向のスリットが形成され、封入容器と内圧クリープ試験片との間のガス空間を最小化するのが好ましい。また高圧ガス弁を封入容器と混合器に直接組み込んで、バルブ内蔵型封入容器及びバルブ内蔵型混合器とする構成が好ましい。   In the present invention, a test piece fixing holder that is fitted with an internal pressure creep test piece and fitted in a sealed container is used, and the test piece fixing holder is formed with axial and circumferential slits on the outer peripheral surface, It is preferred to minimize the gas space between the enclosure and the internal pressure creep specimen. Further, a configuration in which a high-pressure gas valve is directly incorporated in an enclosure and a mixer to form a valve-embedded enclosure and a valve-embedded mixer is preferable.

本発明の内圧クリープ試験片へのタグガス封入装置は、封入容器の前段に、攪拌機能を備えた内容積可変型の混合器を設置し、タグガスと内圧負荷ガスを別々に混合器の混合室に導き、該混合室に圧入するプランジャにより高圧混合ガスを封入容器に圧送するように構成されているので、タグガスと内圧負荷ガスが均一な混合ガスになり、それらの混合割合を正確に把握でき、高温時の内部応力を正確に算出できる。   In the tag gas sealing device for the internal pressure creep test piece of the present invention, an internal volume variable type mixer having a stirring function is installed in the front stage of the sealing container, and the tag gas and the internal pressure load gas are separately supplied to the mixing chamber of the mixer. Since the high pressure mixed gas is configured to be pumped into the sealed container by the plunger press-fitted into the mixing chamber, the tag gas and the internal pressure load gas become a uniform mixed gas, and the mixing ratio thereof can be accurately grasped. The internal stress at high temperature can be calculated accurately.

また本発明の内圧クリープ試験片へのタグガス封入装置は、高圧ガス弁を封入容器と混合器に直接組み込んで、バルブ内蔵型封入容器及びバルブ内蔵型混合器とし、更に内圧クリープ試験片が嵌入し且つ封入容器内に嵌入する試験片固定用ホルダを使用し、ガス流路は試験片固定用ホルダの外周面に設けた軸方向及び円周方向のスリットで形成しているため、封入容器と内圧クリープ試験片との間のガス空間を最小化することができ、それらによってタグガスが無駄になることが非常に少なくなり、内圧クリープ試験片の製作コストを低減することができる。   In addition, the tag gas sealing device for the internal pressure creep test piece of the present invention directly incorporates a high pressure gas valve into the sealing container and the mixer to form a valve built-in type sealing container and a valve built-in type mixer, and further, an internal pressure creep test piece is inserted. In addition, a test piece fixing holder that fits in the enclosure is used, and the gas flow path is formed by axial and circumferential slits provided on the outer peripheral surface of the test piece fixation holder. The gas space between the creep test specimens can be minimized, thereby greatly reducing the waste of tag gas and reducing the production cost of the internal pressure creep test specimens.

図１は、本発明に係るタグガス封入装置の全体構成を示す説明図である。これは、原子炉内に装荷する内圧クリープ試験片に、タグガス（ここではＸｅ，Ｋｒガス）と内圧負荷ガス（ここではＨｅガス）を混合して最大２０ＭＰａの圧力範囲内の任意の圧力で封入する装置である。本装置は、主として、互いに連通する２基の封入容器１０，１２、その前段に位置する混合器１４、Ｈｅガス源１６、加圧器１８、タグガス容器２０、真空ポンプ２２、及びそれらを接続する配管や各種の弁などから構成される。これらの装置は、高圧ガス保安法の第１種高圧ガス製造設備に該当し、その基準を全て満たすように設計・製作される。封入容器１０，１２は、その内部に内圧クリープ試験片２４を収納可能で、且つ窓部にサファイアガラス２６を装着した構造であり、Ｘ−Ｙステージ２８に搭載したＹＡＧレーザ溶接機３０により、前記サファイアガラス越しに内圧クリープ試験片２４のガス封入孔を溶封できるように構成されている。なお、図１では一方の封入容器１２のみにＹＡＧレーザ溶接機３０が付設されているように描いているが、両方にそれぞれ設けてもよいし、１台で共用するようにしてもよい。   FIG. 1 is an explanatory diagram showing the overall configuration of a tag gas sealing device according to the present invention. This is because the internal pressure creep test specimen loaded in the reactor is mixed with tag gas (here Xe, Kr gas) and internal pressure load gas (here He gas) and sealed at an arbitrary pressure within a pressure range of 20 MPa at maximum. It is a device to do. This apparatus mainly includes two enclosures 10 and 12 communicating with each other, a mixer 14 located in the preceding stage, a He gas source 16, a pressurizer 18, a tag gas container 20, a vacuum pump 22, and piping for connecting them. And various valves. These devices correspond to the first type high pressure gas production facility of the High Pressure Gas Safety Law, and are designed and manufactured to meet all the standards. The enclosures 10 and 12 have a structure in which an internal pressure creep test piece 24 can be accommodated and a sapphire glass 26 is attached to a window portion. The YAG laser welding machine 30 mounted on the XY stage 28 is used to The gas filling hole of the internal pressure creep test piece 24 can be sealed through the sapphire glass. In FIG. 1, the YAG laser welder 30 is illustrated as being attached only to one enclosure 12, but may be provided in both, or may be shared by one.

混合器１４の一例を図２に示す。この混合器は、内容積可変型であり且つ攪拌機能を備えた構造である。高圧ガス弁３２を介してタグガス及びＨｅガスを導入する混合室３４、圧縮空気によって往復駆動されるエアシリンダ３６、該エアシリンダ３６によって混合室３４内で進退するプランジャ３８、電磁スターラ（混合室内に収容されている回転子４０と混合室外に位置する電磁スターラ本体４２の組み合わせ）などからなる。前述したように、タグガスは高価なガスであり、そのため損失を可能な限り減らす必要がある。内圧クリープ試験片の封入本数（即ち封入容積）に合わせてタグガスとＨｅガスの混合ガスを無駄なく作るために、混合器１４を内容積可変型としている。つまり、混合器１４のプランジャ位置を試験片容積に合わせ、そこに〔必要タグガス量／試験片容積〕で求めた圧力のタグガスを導入する。次に、混合器圧力が〔所定の内圧〕に達するように、Ｈｅガスを加圧しながら導入する。ここで、タグガスとＨｅガスは、圧縮性の違いから２層に分かれるが、電磁スターラによる回転子４０の攪拌機能によって均一な混合ガスにしている。混合室内で均一に混合したガスは、圧縮空気によってプランジャ３８を押し下げることで押し出され、封入容器１０，１２内に導入される。ここではプランジャ３８のピストン機能により、混合室３４内に残るガス量を極力少なくしている。   An example of the mixer 14 is shown in FIG. This mixer is of a variable internal volume type and has a stirring function. A mixing chamber 34 for introducing tag gas and He gas through a high-pressure gas valve 32, an air cylinder 36 reciprocally driven by compressed air, a plunger 38 that moves forward and backward in the mixing chamber 34 by the air cylinder 36, an electromagnetic stirrer (into the mixing chamber) A combination of the rotor 40 accommodated and the electromagnetic stirrer main body 42 located outside the mixing chamber). As described above, the tag gas is an expensive gas, and therefore it is necessary to reduce the loss as much as possible. In order to make the mixed gas of tag gas and He gas without waste according to the number of sealed internal pressure creep test pieces (that is, filled volume), the mixer 14 is of a variable internal volume type. That is, the plunger position of the mixer 14 is adjusted to the test piece volume, and the tag gas having the pressure determined by [necessary tag gas amount / test piece volume] is introduced therein. Next, He gas is introduced while being pressurized so that the mixer pressure reaches a [predetermined internal pressure]. Here, the tag gas and the He gas are divided into two layers due to the difference in compressibility, but a uniform mixed gas is formed by the stirring function of the rotor 40 by an electromagnetic stirrer. The gas uniformly mixed in the mixing chamber is pushed out by pushing down the plunger 38 with the compressed air and introduced into the enclosures 10 and 12. Here, the amount of gas remaining in the mixing chamber 34 is reduced as much as possible by the piston function of the plunger 38.

次に、封入容器の詳細と内圧クリープ試験片の装着状態を図３に示す。前記のように、封入容器１０，１２は、内部に内圧クリープ試験片２４が収納可能で、且つ窓部にサファイアガラス２６を装着した構造であり、２基とも同じ構造であってよい。封入容器１０，１２の内部に丁度嵌入する試験片固定用ホルダ４４を使用し、該試験片固定用ホルダ４４内に内圧クリープ試験片２４が丁度嵌入するように構成する。試験片固定用ホルダ４４には、その外周面に軸方向及び円周方向のスリット４６を形成し、そのスリットをガス流路として使用する。このようにすることで、封入容器１０，１２と内圧クリープ試験片２４との間を試験片固定用ホルダ４４で埋めガス空間を最小化している。このような構造は、内圧クリープ試験片の外形が変わっても、それに対応した試験片固定用ホルダを作り直すだけで封入装置をそのまま使用できる利点もある。   Next, FIG. 3 shows the details of the sealed container and the mounting state of the internal pressure creep test piece. As described above, the enclosures 10 and 12 have a structure in which the internal pressure creep test piece 24 can be accommodated and the sapphire glass 26 is attached to the window, and the two units may have the same structure. A test piece fixing holder 44 that is just inserted into the enclosures 10 and 12 is used, and the internal pressure creep test piece 24 is set to be inserted into the test piece fixing holder 44. The test piece fixing holder 44 is formed with axial and circumferential slits 46 on the outer peripheral surface thereof, and the slits are used as gas flow paths. By doing so, the space between the sealed containers 10 and 12 and the internal pressure creep test piece 24 is filled with the test piece fixing holder 44 to minimize the gas space. Such a structure also has an advantage that even if the outer shape of the internal pressure creep test piece changes, the sealing device can be used as it is simply by recreating the corresponding test piece fixing holder.

内圧クリープ試験片２４を試験片固定用ホルダ４４に装着し、それを封入容器１０，１２に収納する。ここでは試験片固定用ホルダ４４に最大３本の内圧クリープ試験片２４を装着可能としてある。また前記のように、封入容器１０，１２は２基装備されている。これによって、同一封入条件での試験片封入を最大６個まで可能としている。このことは、内圧クリープ試験片取り出しのための封入容器蓋の開放回数が減ることを意味し、蓋の開放による封入容器内の残タグガスの放出量の削減が可能となる。   The internal pressure creep test piece 24 is mounted on the test piece fixing holder 44 and stored in the enclosures 10 and 12. Here, a maximum of three internal pressure creep test pieces 24 can be attached to the test piece fixing holder 44. Further, as described above, two enclosures 10 and 12 are provided. As a result, up to six test pieces can be sealed under the same sealing conditions. This means that the number of times of opening of the sealed container lid for taking out the internal pressure creep test piece is reduced, and it becomes possible to reduce the discharge amount of the remaining tag gas in the sealed container by opening the cover.

タグガスの封入に先立ち、封入容器１０，１２の内部を真空排気する。その後、混合ガスは、封入容器１０，１２の混合ガス導入口４８から導かれ、試験片固定用ホルダ側面のスリット４６を通じて内圧クリープ試験片２４のガス封入孔５０から内圧クリープ試験片内に入る。このとき、混合ガスの損失を少なくするために、前記のように試験片固定用ホルダ４４を用いることで封入容器内の空隙を可能な限り少なくしているのである。また、封入時のガス温度測定のために、熱電対温度センサ５２を備えている。封入容器１０，１２では、高圧ガス雰囲気下にある内圧クリープ試験片２４のガス封入孔５０を、Ｘ−Ｙステージ２８で位置決めしたレーザ溶接機３０により、サファイアガラス２６を通して高出力レーザ光を照射することで溶封する。   Prior to enclosing the tag gas, the inside of the enclosures 10 and 12 is evacuated. Thereafter, the mixed gas is guided from the mixed gas introduction port 48 of the sealed containers 10 and 12 and enters the internal pressure creep test piece through the gas sealing hole 50 of the internal pressure creep test piece 24 through the slit 46 on the side surface of the test piece fixing holder. At this time, in order to reduce the loss of the mixed gas, the gap in the sealed container is reduced as much as possible by using the test piece fixing holder 44 as described above. In addition, a thermocouple temperature sensor 52 is provided for measuring the gas temperature at the time of sealing. In the enclosures 10 and 12, a high-power laser beam is irradiated through the sapphire glass 26 by the laser welding machine 30 in which the gas enclosure hole 50 of the internal pressure creep test piece 24 in a high-pressure gas atmosphere is positioned by the XY stage 28. To seal.

ここで、内圧クリープ試験片２４は、基本的に従来品と同じ構造でよい。その一例を図４に示す。筒状体５４の両端部に、上部端栓５６と下部端栓５８を溶接で接合した構造とする。上部端栓５６の中心にはガス封入孔５０が形成されており、高出力のレーザ光の照射を受けて、溶封される。   Here, the internal pressure creep test piece 24 may basically have the same structure as the conventional product. An example is shown in FIG. An upper end plug 56 and a lower end plug 58 are joined to both ends of the cylindrical body 54 by welding. A gas sealing hole 50 is formed at the center of the upper end plug 56 and is sealed by receiving high-power laser light.

なお、本発明では、容器などの連結配管系統でのガス損失を最少にするような工夫が施されている。従来技術では、市販品の高圧ガス弁を高圧ガス配管の途中に組み込んでいるが、そのような構成では、長い配管内もタグガスのデッドスペースになり、損失になる。本発明では、図２あるいは図３からも分かるように、混合器１４や封入容器１０，１２の本体ブロックを高圧ガス弁３２のボディとして利用している。即ち、高圧ガス弁３２を混合器１４や封入容器１０，１２に内蔵させている。これによって配管長の短縮が可能となる。また、タグガスが通じる配管は、全て外径約０．１６ｃｍ（１／１６インチ）の細径配管を使用している。これらによって、タグガスの損失を最小限に抑えている。   In the present invention, a contrivance is made to minimize gas loss in a connecting piping system such as a container. In the prior art, a commercially available high-pressure gas valve is incorporated in the middle of the high-pressure gas pipe. With such a configuration, the long pipe also becomes a dead space for the tag gas, resulting in a loss. In the present invention, as can be seen from FIG. 2 or FIG. 3, the main body block of the mixer 14 and the enclosures 10 and 12 is used as the body of the high-pressure gas valve 32. That is, the high-pressure gas valve 32 is built in the mixer 14 and the enclosures 10 and 12. This makes it possible to shorten the pipe length. Further, all the pipes through which the tag gas communicates are thin pipes having an outer diameter of about 0.16 cm (1/16 inch). As a result, the loss of tag gas is minimized.

本発明に係るタグガス封入装置を用いて、内圧クリープ試験片にＸｅガスとＨｅガスを高圧で封入した時の混合の効果をもとめた。その結果を、表１及び図５に示す。ここで、Ｘｅガスはタグガスを想定したものである。   Using the tag gas sealing apparatus according to the present invention, the mixing effect was obtained when Xe gas and He gas were sealed at a high pressure in the internal pressure creep test piece. The results are shown in Table 1 and FIG. Here, Xe gas assumes tag gas.

Figure 2006010355
Figure 2006010355

混合器無しの状態で封入した内圧クリープ試験片にはＸｅガスが優先的に封入されていることが分かる。それに対して混合器を有する場合（本発明装置）、内圧クリープ試験片にはほぼ目標通りの割合でＸｅガスとＨｅガスが封入されており、攪拌による均一化の効果は明瞭である。均一化を図った２種類のガスを分析すると、目標とするタグガス割合に対して１０％以内の精度での封入が可能であることが確認できた。原子炉内での内圧クリープ試験では、高温での熱膨張による内部応力を正確に評価するためには、封入時のＨｅガスとタグガスの封入量を正確に制御する必要があるが、本発明装置はそれが可能になっている。   It can be seen that Xe gas is preferentially sealed in the internal pressure creep test specimen sealed without the mixer. On the other hand, in the case of having a mixer (the device of the present invention), Xe gas and He gas are sealed in the internal pressure creep test piece at a substantially target ratio, and the effect of homogenization by stirring is clear. Analysis of two types of gases that were made uniform confirmed that it was possible to enclose with an accuracy within 10% of the target tag gas ratio. In an internal pressure creep test in a nuclear reactor, in order to accurately evaluate internal stress due to thermal expansion at a high temperature, it is necessary to accurately control the amount of He gas and tag gas enclosed at the time of encapsulation. Makes it possible.

本発明に係るタグガス封入装置の全体構成を示す説明図。Explanatory drawing which shows the whole structure of the tag gas sealing apparatus which concerns on this invention. 混合器の一例を示す説明図。Explanatory drawing which shows an example of a mixer. 封入容器の詳細と内圧クリープ試験片の装着状態を示す説明図。Explanatory drawing which shows the mounting | wearing state of the detail of an enclosure, and an internal pressure creep test piece. 内圧クリープ試験片の一例を示す説明図。Explanatory drawing which shows an example of an internal pressure creep test piece. Ｘｅ濃度の目標値と実測値の関係を示すグラフ。The graph which shows the relationship between the target value of Xe density | concentration, and an actual value.

符号の説明Explanation of symbols

１０，１２ 封入容器
１４ 混合器
１６ Ｈｅガス源
２０ タグガス容器
２４ 内圧クリープ試験片
２６ サファイアガラス
３０ レーザ溶接機
10, 12 Enclosed container 14 Mixer 16 He gas source 20 Tag gas container 24 Internal pressure creep test piece 26 Sapphire glass 30 Laser welder

Claims (3)

内圧クリープ試験片を封入容器内に設置し、タグガスと内圧負荷ガスを該封入容器内に導いて内圧クリープ試験片内に充填し、レーザ溶接により内圧クリープ試験片のガス封入孔を封止する装置において、前記封入容器の前段に、攪拌機能を備えた内容積可変型の混合器を設置し、タグガスと内圧負荷ガスを別々に混合器の混合室に導き、該混合室に圧入するプランジャにより高圧混合ガスが封入容器に圧送されるようにしたことを特徴とする内圧クリープ試験片へのタグガス封入装置。   A device that installs an internal pressure creep test piece in an enclosure, guides the tag gas and internal pressure load gas into the enclosure, fills the internal pressure creep test piece, and seals the gas filled hole of the internal pressure creep test piece by laser welding The internal volume variable type mixer having a stirring function is installed in the front stage of the enclosure, and the tag gas and the internal pressure load gas are separately introduced into the mixing chamber of the mixer, and the pressure is increased by the plunger press-fitted into the mixing chamber. A tag gas sealing device for an internal pressure creep test piece, characterized in that a mixed gas is pumped to a sealed container. 内圧クリープ試験片が嵌入し且つ封入容器内に嵌入する試験片固定用ホルダを使用し、該試験片固定用ホルダには外周面に軸方向及び円周方向のスリットが形成され、封入容器と内圧クリープ試験片との間のガス空間を最小化した請求項１記載の内圧クリープ試験片へのタグガス封入装置。   A test piece fixing holder in which an internal pressure creep test piece is inserted and fitted in an enclosed container is used. The test piece fixing holder has slits in the axial direction and the circumferential direction formed on the outer peripheral surface thereof. 2. The tag gas sealing device for an internal pressure creep test piece according to claim 1, wherein a gas space between the creep test piece and the creep test piece is minimized. 高圧ガス弁を、封入容器と混合器に直接組み込んで、バルブ内蔵型封入容器及びバルブ内蔵型混合器とした請求項１又は２記載の内圧クリープ試験片へのタグガス封入装置。
The tag gas sealing device for an internal pressure creep test piece according to claim 1 or 2, wherein the high-pressure gas valve is directly incorporated in the sealing container and the mixer to form a valve-containing sealing container and a valve-containing mixer.
JP2004184212A 2004-06-22 2004-06-22 Tag gas sealing device for internal pressure creep test piece Expired - Fee Related JP3822886B2 (en)

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Publication number Priority date Publication date Assignee Title
JP2007256164A (en) * 2006-03-24 2007-10-04 Nippon Nuclear Fuel Dev Co Ltd Circumferential-directional strength measuring instrument for fuel sheath tube
JP2016001132A (en) * 2014-06-11 2016-01-07 新日鐵住金株式会社 Break determination method and flexure test device
CN113654912A (en) * 2021-07-24 2021-11-16 安阳工学院 High-temperature thin-wall pressure vessel double-shaft creep testing system and method
CN113654912B (en) * 2021-07-24 2024-05-28 安阳工学院 Double-shaft creep testing system and method for high-temperature thin-wall pressure vessel

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