JPH055796A - Mock fuel rod - Google Patents
Mock fuel rodInfo
- Publication number
- JPH055796A JPH055796A JP3158224A JP15822491A JPH055796A JP H055796 A JPH055796 A JP H055796A JP 3158224 A JP3158224 A JP 3158224A JP 15822491 A JP15822491 A JP 15822491A JP H055796 A JPH055796 A JP H055796A
- Authority
- JP
- Japan
- Prior art keywords
- fuel rod
- groove
- thermocouple
- metal
- boiling
- 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
-
- 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】
【目的】実機燃料棒の表面状態を模擬し、被覆管の表面
に形成した計装ケーブルたとえば熱電対を嵌め込む溝か
らの好ましくない沸騰を抑えるとともに、実機燃料棒と
沸騰状態を同じくなるようにする。
【構成】被覆管１の表面に熱電対６を嵌め込む溝５を形
成し、この溝５内に熱電対６を嵌め込む。溝５と熱電対
６との隙間に銀ろうなどの金属８を埋め込んで緻密性を
保ち、かつ埋め込んだ金属８の表面を滑らかに仕上げ
る。
(57) [Abstract] [Purpose] Simulates the surface condition of an actual fuel rod, suppresses undesired boiling from the instrument cable formed on the surface of the cladding tube, for example, a groove into which a thermocouple is fitted, and boil with the actual fuel rod. Make the states the same. [Structure] A groove 5 into which a thermocouple 6 is fitted is formed on the surface of the cladding tube 1, and the thermocouple 6 is fitted into the groove 5. A metal 8 such as silver solder is embedded in the gap between the groove 5 and the thermocouple 6 to maintain the denseness, and the surface of the embedded metal 8 is finished smoothly.
Description
【０００１】[0001]
【産業上の利用分野】本発明はたとえば沸騰水型原子炉
（以下、ＢＷＲと記す）の熱水試験に使用する模擬燃料
棒に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulated fuel rod used, for example, in a hot water test of a boiling water reactor (hereinafter referred to as BWR).
【０００２】[0002]
【従来の技術】原子炉核燃料の冷却特性を理解するため
に模擬燃料棒を使いＢＷＲ用燃料集合性の熱水力試験を
行っている。その試験結果をもとに冷却・流れの状態に
ついての研究に役立てている。模擬燃料棒の寸法等につ
いては実機燃料棒と全て同様になっている。2. Description of the Related Art In order to understand the cooling characteristics of a nuclear reactor fuel, a simulated fuel rod is used to perform a thermal-hydraulic test for fuel assembly for BWRs. Based on the test results, it is useful for research on cooling and flow conditions. The dimensions of the simulated fuel rods are all the same as the actual fuel rods.
【０００３】図２を参照しながら従来の模擬燃料棒の構
成を説明する。なお、図２において（ａ）は模擬燃料棒
を一部切欠して示す斜視図で、（ｂ）は被覆管を示し、
（ｃ）は（ａ）のＣ−Ｃ矢視方向に沿って切断した断面
を示している。図中符号１は長尺の有底被覆管を示して
おり、この被覆管１内には外側絶縁材２と、発熱体３
と、内側絶縁材４が収納されている。外側絶縁材２と内
側絶縁材４とは一体でも、別々に形成されていもよく、
発熱体３は両絶縁材２，４内に埋め込まれた形状になっ
ている。被覆管１の表面には細長いたて状の溝５が形成
されており、この溝５内に計装ケーブルとしてたとえば
熱電対６が嵌め込まれている。被覆管１の上端は端栓７
で閉塞されている。発熱体３はニクロム線などを細長く
ら施状に巻回した棒状体または板状の電気抵抗体であ
る。熱水試験に際しては電気発熱により実機燃料棒を模
擬した熱を発生させている。熱電対６は被覆管１の表面
の温度を計測するためのものである。The structure of a conventional simulated fuel rod will be described with reference to FIG. In addition, in FIG. 2, (a) is a perspective view showing a partial cutaway of the simulated fuel rod, (b) shows a cladding tube,
(C) has shown the cross section cut | disconnected along the CC arrow direction of (a). In the figure, reference numeral 1 indicates a long bottomed coating tube, and inside the coating tube 1, an outer insulating material 2 and a heating element 3 are provided.
And the inner insulating material 4 is stored. The outer insulating material 2 and the inner insulating material 4 may be formed integrally or separately,
The heating element 3 has a shape embedded in both insulating materials 2 and 4. An elongated vertical groove 5 is formed on the surface of the cladding tube 1, and, for example, a thermocouple 6 is fitted in the groove 5 as an instrumentation cable. The upper end of the cladding tube 1 has an end plug 7
Is blocked by. The heating element 3 is a rod-shaped body or a plate-shaped electric resistance body formed by winding a nichrome wire or the like into a strip shape. In the hot water test, electric heat is used to generate heat that simulates a real fuel rod. The thermocouple 6 is for measuring the temperature of the surface of the cladding tube 1.
【０００４】[0004]
【発明が解決しようとする課題】従来の模擬燃料棒は被
覆管１の溝５内に嵌め込んだ熱電対６は表面が露出して
いるため、その表面と、溝との隙間などに大きな傷が生
じていることになる。傷は沸騰の核となり、ＢＷＲ用実
機燃料棒とは異なった沸騰が起こる恐れがある。被覆管
表面の傷等、沸騰の核が大きくなれば、低い表面温度で
沸騰（発泡）を開始するため、溝５を形成している部分
の被覆管の表面温度および沸騰状態の模擬に影響してく
る課題がある。また、熱電対６は露出しているため、冷
却水による温度低下があり、正確な被覆管１の温度とは
多少異なっており、さらに溝５が形成されていると冷却
水の流動状態も変ってくるなどの課題がある。In the conventional simulated fuel rod, since the surface of the thermocouple 6 fitted in the groove 5 of the cladding tube 1 is exposed, a large scratch is formed in the gap between the surface and the groove. Has occurred. The scratch becomes a core of boiling, and there is a possibility that boiling different from that of the actual fuel rod for BWR may occur. If the core of boiling such as scratches on the surface of the cladding becomes large, boiling (foaming) will start at a low surface temperature, which will affect the simulation of the surface temperature and boiling state of the cladding at the portion where the groove 5 is formed. There are challenges to come. Further, since the thermocouple 6 is exposed, there is a temperature drop due to the cooling water, which is slightly different from the accurate temperature of the cladding tube 1, and when the groove 5 is formed, the flow state of the cooling water also changes. There are issues such as coming.
【０００５】本発明は上記課題を解決するためになされ
たもので、実機燃料棒の表面状態を模擬し、被覆管の表
面に形成した計装ケーブル嵌め込み用溝からの好ましく
ない沸騰を抑えるとともに実機燃料棒と沸騰状態を同じ
くなるように形成した模擬燃料棒を提供することにあ
る。The present invention has been made to solve the above problems, and simulates the surface condition of an actual fuel rod to suppress undesired boiling from the instrumentation cable fitting groove formed on the surface of the cladding tube. It is an object of the present invention to provide a simulated fuel rod formed so that the boiling state is the same as that of the fuel rod.
【０００６】[0006]
【課題を解決するための手段】本発明は被覆管内に絶縁
材被覆管内に絶縁材が充填され、この絶縁材中に発熱体
が埋め込まれ、前記被覆管の表面に細長の溝が形成さ
れ、この溝内に計装ケーブルが嵌め込まれてなる模擬燃
料棒において、前記計装ケーブルと前記溝との隙間を金
属で埋め込むとともに前記計装ケーブルの表面を金属で
覆い、その金属表面を円滑面に形成してなることを特徴
とする。According to the present invention, an insulating material is filled in an insulating material in a cladding tube, a heating element is embedded in the insulating material, and an elongated groove is formed on the surface of the cladding tube. In a simulated fuel rod in which an instrumentation cable is fitted in this groove, the gap between the instrumentation cable and the groove is filled with metal, the surface of the instrumentation cable is covered with metal, and the metal surface is made smooth. It is characterized by being formed.
【０００７】[0007]
【作用】被覆管表面の沸騰は沸騰の核つまり被覆管表面
の傷等が大きいほど低い表面温度で発泡を開始する。溝
と計装ケーブルの隙間が金属で埋め込まれ、かつその金
属の表面が円滑面に形成されていると、傷がなくなった
状態と同様になるので、実機燃料棒の表面粗さに近づき
好ましくない沸騰を抑えることができる。よって、ＢＷ
Ｒ用実機燃料棒と誤差のない沸騰状態を起こさせること
ができる。As for the boiling of the surface of the cladding, the larger the nucleus of boiling, that is, the scratch on the surface of the cladding, the lower the surface temperature of foaming. If the gap between the groove and the instrumentation cable is filled with metal and the surface of the metal is formed into a smooth surface, it will be similar to the state where there is no scratch, so it will approach the surface roughness of the actual fuel rod and it is not preferable The boiling can be suppressed. Therefore, BW
It is possible to cause a boiling state without error with the R actual fuel rod.
【０００８】[0008]
【実施例】図１を参照しながら本発明に係る模擬燃料棒
の一実施例を説明する。図１において、（ａ）は模擬燃
料棒を一部切欠して示す斜視図で、（ｂ）は被覆管を示
し、（ｃ）は（ａ）のＣ−Ｃ矢視方向を切断した横断面
を示し、（ｄ）は（ｂ）における要部を拡大して示す部
分断面図である。図１において符号１は長尺の細長い円
筒状態被覆管であり、下端部は閉塞されている。被覆管
１内には（ｃ）から明らかなように外側絶縁材２、発熱
体３および内側絶縁材４が収納されている。内側絶縁材
２および外側絶縁材４は別体でもよく同一体でもよい。
発熱体３は上記両絶縁材２，４内に埋め込まれた状態で
挿入されている。被覆管１の表面には（ｂ）に示したよ
うに細長い溝５が軸方向に沿って形成されており、この
溝５内に計装ケーブルとしての熱電対６が嵌め込まれて
いる。溝５と熱電対６との隙間は（ｄ）に示ししたよう
に金属ろうなどの金属８で埋め込まれ、かつ熱電対６の
表面は金属８で覆われ、その金属８の表面は円滑面に形
成されている。なお、金属８には実機燃料棒の表面状態
に近づけるため、銀ろう、ニッケルろうなどを使用して
緻密に埋め込み、その表面を滑らかに仕上げておくこと
が必要である。被覆管１の上部開口は端栓７で閉塞され
ている。EXAMPLE An example of a simulated fuel rod according to the present invention will be described with reference to FIG. In FIG. 1, (a) is a perspective view showing a partial cutaway of a simulated fuel rod, (b) shows a cladding tube, and (c) is a cross-sectional view taken along the line CC of FIG. And (d) is a partial cross-sectional view showing an enlarged main part in (b). In FIG. 1, reference numeral 1 is a long and thin cylindrical covering tube, and the lower end is closed. An outer insulating material 2, a heating element 3, and an inner insulating material 4 are housed in the cladding tube 1 as is apparent from FIG. The inner insulating material 2 and the outer insulating material 4 may be separate bodies or the same body.
The heating element 3 is inserted in a state of being embedded in both the insulating materials 2 and 4. An elongated groove 5 is formed on the surface of the cladding tube 1 along the axial direction as shown in (b), and a thermocouple 6 as an instrumentation cable is fitted in the groove 5. The gap between the groove 5 and the thermocouple 6 is filled with a metal 8 such as a brazing metal as shown in (d), and the surface of the thermocouple 6 is covered with the metal 8, and the surface of the metal 8 becomes a smooth surface. Has been formed. In order to make the surface of the metal 8 close to the surface of the actual fuel rod, it is necessary to use silver solder, nickel solder or the like to bury it closely and finish its surface smoothly. The upper opening of the cladding tube 1 is closed by an end plug 7.
【０００９】しかして、上記構成による模擬燃料棒によ
れば、熱電対６と溝５との隙間および熱電対の表面が金
属８で埋め込まれ、また覆われているために実機燃料棒
と同様の表面状態を保つことができる。すなわち、沸騰
は伝熱面（加熱面）上の欠陥（傷）にトラップされた不
凝縮性ガス例えば空気が発泡の核となって起こり、その
傷を直径ｒの穴にたとえるとｒが大きいほど低い表面温
度で沸騰を開始する。模擬燃料棒の沸騰は沸騰の核（表
面の傷等）が大きいほど低い表面温度で発泡を開始する
ので、本実施例のように溝５を金属８で埋めて被覆管１
の表面の傷をなくし、実機燃料棒の表面粗さに近づけ好
ましくない沸騰を抑えることができる。According to the simulated fuel rod having the above structure, however, the gap between the thermocouple 6 and the groove 5 and the surface of the thermocouple are embedded and covered with the metal 8, so that they are similar to those of the actual fuel rod. The surface condition can be maintained. That is, boiling occurs when a non-condensable gas such as air trapped in a defect (scratch) on the heat transfer surface (heating surface) serves as a core of foaming, and if the scratch is compared with a hole having a diameter r, the larger r is. Start boiling at low surface temperature. In the boiling of the simulated fuel rod, the larger the boiling nucleus (such as scratch on the surface), the lower the surface temperature starts to foam. Therefore, the groove 5 is filled with the metal 8 to cover the cladding tube 1 as in the present embodiment.
It is possible to eliminate the scratches on the surface of the fuel cell, bring it close to the surface roughness of the actual fuel rod, and suppress the undesirable boiling.
【００１０】[0010]
【発明の効果】本発明によれば実機燃料棒では起こり得
ない大きな傷での沸騰を抑え、実機燃料棒にさらに近い
表面状態にすることができ、実機燃料棒の沸騰状態を忠
実に再現できる効果がある。EFFECTS OF THE INVENTION According to the present invention, it is possible to suppress boiling due to a large scratch that cannot occur with an actual fuel rod, to bring the surface state closer to that of an actual fuel rod, and to faithfully reproduce the boiling state of an actual fuel rod. effective.
【図１】（ａ）は本発明に係る模擬燃料棒の一実施例を
一部切欠して示す斜視図、（ｂ）は（ａ）における要部
を拡大して示す横断面図。1A is a partially cutaway perspective view showing an embodiment of a simulated fuel rod according to the present invention, and FIG. 1B is a transverse cross-sectional view showing an enlarged main part of FIG. 1A.
【図２】（ａ）は従来の模擬燃料棒を一部切欠して示す
斜視図、（ｂ）は（ａ）における被覆管を示す斜視図、
（ｃ）は（ａ）のＣ−Ｃ矢視方向を切断し拡大して示す
横断面図。FIG. 2A is a perspective view showing a conventional simulated fuel rod with a part thereof cut away, and FIG. 2B is a perspective view showing a cladding tube in FIG. 2A.
(C) is a transverse cross-sectional view showing an enlarged view by cutting the CC direction of (a).
１…被覆管、２…外側絶縁材、３…発熱体、４…内側絶
縁材、５…溝、６…熱電対、７…端栓、８…金属。DESCRIPTION OF SYMBOLS 1 ... Cladding tube, 2 ... Outer insulating material, 3 ... Heating element, 4 ... Inner insulating material, 5 ... Groove, 6 ... Thermocouple, 7 ... End plug, 8 ... Metal.
Claims (1)
材中に発熱体が埋め込まれ、前記被覆管の表面に細長の
溝が形成され、この溝内に計装ケーブルが嵌め込まれて
なる模擬燃料棒において、前記計装ケーブルと前記溝と
の隙間を金属で埋め込むとともに前記計装ケーブルの表
面を金属で覆い、その金属表面を円滑面に形成してなる
ことを特徴とする模擬燃料棒。Claim: What is claimed is: 1. A coating tube is filled with an insulating material, a heating element is embedded in the insulating material, and an elongated groove is formed on the surface of the coating tube. In the simulated fuel rod in which the cable is fitted, the gap between the instrumentation cable and the groove is filled with metal, the surface of the instrumentation cable is covered with metal, and the metal surface is formed as a smooth surface. Characteristic simulated fuel rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3158224A JPH055796A (en) | 1991-06-28 | 1991-06-28 | Mock fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3158224A JPH055796A (en) | 1991-06-28 | 1991-06-28 | Mock fuel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH055796A true JPH055796A (en) | 1993-01-14 |
Family
ID=15666995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3158224A Pending JPH055796A (en) | 1991-06-28 | 1991-06-28 | Mock fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH055796A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064548A (en) * | 2006-09-06 | 2008-03-21 | Toshiba Corp | Simulated fuel rod for nuclear reactor |
| JP2010139420A (en) * | 2008-12-12 | 2010-06-24 | Toshiba Corp | Dummy fuel rod, dummy fuel rod assembly, and method for manufacturing dummy fuel rod |
| CN104064226A (en) * | 2014-07-04 | 2014-09-24 | 中国科学院合肥物质科学研究院 | Simulation fuel assembly sub-channel heating rod interval adjusting device |
| CN106710647A (en) * | 2017-01-09 | 2017-05-24 | 中国核动力研究设计院 | Device and method for simulated measurement of heating rod cluster channel wall temperatures under movement conditions |
| KR101965635B1 (en) * | 2018-09-16 | 2019-04-03 | 주식회사 스탠더드시험연구소 | Method of Installing Thermocouple on Heat Pipe of Heat Exchanger |
-
1991
- 1991-06-28 JP JP3158224A patent/JPH055796A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064548A (en) * | 2006-09-06 | 2008-03-21 | Toshiba Corp | Simulated fuel rod for nuclear reactor |
| JP2010139420A (en) * | 2008-12-12 | 2010-06-24 | Toshiba Corp | Dummy fuel rod, dummy fuel rod assembly, and method for manufacturing dummy fuel rod |
| CN104064226A (en) * | 2014-07-04 | 2014-09-24 | 中国科学院合肥物质科学研究院 | Simulation fuel assembly sub-channel heating rod interval adjusting device |
| CN106710647A (en) * | 2017-01-09 | 2017-05-24 | 中国核动力研究设计院 | Device and method for simulated measurement of heating rod cluster channel wall temperatures under movement conditions |
| KR101965635B1 (en) * | 2018-09-16 | 2019-04-03 | 주식회사 스탠더드시험연구소 | Method of Installing Thermocouple on Heat Pipe of Heat Exchanger |
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