JPS62245902A - Method and device for measuring thickness of internal surface coating film of cladding tube of nuclear fuel - Google Patents
Method and device for measuring thickness of internal surface coating film of cladding tube of nuclear fuelInfo
- Publication number
- JPS62245902A JPS62245902A JP8800786A JP8800786A JPS62245902A JP S62245902 A JPS62245902 A JP S62245902A JP 8800786 A JP8800786 A JP 8800786A JP 8800786 A JP8800786 A JP 8800786A JP S62245902 A JPS62245902 A JP S62245902A
- Authority
- JP
- Japan
- Prior art keywords
- cladding tube
- nuclear fuel
- coil
- thickness
- coating
- 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
- 238000005253 cladding Methods 0.000 title claims abstract description 80
- 239000011248 coating agent Substances 0.000 title claims abstract description 58
- 238000000576 coating method Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003758 nuclear fuel Substances 0.000 title claims description 23
- 238000012360 testing method Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 18
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000005674 electromagnetic induction Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 10
- 230000001066 destructive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 239000010949 copper Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、コーティングの膜厚測定、特に核燃料被覆管
内面コーティング膜厚測定方法および測定装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to measuring the thickness of a coating, particularly to a method and apparatus for measuring the thickness of a nuclear fuel cladding inner surface coating.
核燃料被覆管（以下被覆管と称する）内面のコーティン
グの膜厚測定に関しては、被覆管を切断して判定する破
壊式測定方法と１例えば特開昭５８−１６６２０３号公
報、特ＩＪＩ＠５９−６７４０６号公報に開示されてい
るような非破壊式測定方法がある。Regarding the film thickness measurement of the coating on the inner surface of a nuclear fuel cladding tube (hereinafter referred to as cladding tube), there are two methods: a destructive measurement method in which the cladding tube is cut and determined; There is a non-destructive measurement method as disclosed in Japanese Patent Application No.
被覆管の切断による方法は、切断面を酸に漬け。 To cut the cladding, the cut surface is soaked in acid.
母管材とコーティング膜の耐食性の差により生ずる表面
液本状況の差を光学的に調べて厚さを求める方法である
が、破壊的検査方式であるため、抜取り検査には適用で
きても全品検査には適用できず、また測定に時間がかか
るという欠点がある。This is a method to determine the thickness by optically examining the difference in the surface liquid condition caused by the difference in corrosion resistance between the parent tube material and the coating film, but since it is a destructive inspection method, it can be applied to sampling inspections but cannot be used for whole-item inspection. It has the disadvantage that it cannot be applied and that it takes time to measure.
非破壊式による膜厚測定方法は、第３図に示すようなも
ので、被覆管１の内側にコイルを具備するプローブ２を
挿入して行なうものであるが、被覆管１の内面とプロー
ブ２との距離を常に一定に保つため、リーフスプリング
等が設けられており、このスプリング等が被覆管ｌの内
面を移動する場合、コーティング膜ＫｇＪをつけるとい
う恐れがある。The non-destructive film thickness measurement method is as shown in FIG. 3, and is carried out by inserting a probe 2 equipped with a coil inside the cladding tube 1. A leaf spring or the like is provided in order to maintain a constant distance from the cladding tube l at all times, and if this spring or the like moves on the inner surface of the cladding tube l, there is a risk that a coating film KgJ may be applied.
このように従来技術では、いずれの方法を用いてもコー
ティング膜に損傷を与え、あるいは測定に時間がかかる
などの問題があった。As described above, the conventional techniques have problems such as damaging the coating film or taking a long time for measurement no matter which method is used.
本発明は、被覆管内面コーティングの膜厚を無接触法に
より、非破壊的に測定する核燃料被覆管内面コーティン
グ膜厚測定方法および測定装置を提供することを目的と
する。An object of the present invention is to provide a method and apparatus for measuring the thickness of the inner surface coating of a nuclear fuel cladding tube, which non-destructively measures the thickness of the inner surface coating of the cladding tube by a non-contact method.
本発明は、上記の目的を達成するため、コーティング膜
内に渦電流が流れるようにし、この渦′１ｉＫよって被
覆管の外側に巻装された噴出コ〜ｒルのインピーダンス
を変化せしめ、このインピーダンスの変化からコーティ
ングの膜厚を無接触で測定する手段と、被覆管を軸方向
に移動可能とし、被覆管の全長にわたり連続的に膜厚を
測定する手段とを用い、問題点の解決を計ったものであ
る。In order to achieve the above object, the present invention causes an eddy current to flow in the coating film, and changes the impedance of the jet coil wound around the outside of the cladding tube by the eddy current. We attempted to solve this problem by using a method to measure the coating thickness without contact based on changes in the coating thickness, and a method that allows the cladding tube to be moved in the axial direction and measures the coating thickness continuously over the entire length of the cladding tube. It is something that
以上のように本発明の測定方法ｐよび測定装置において
は、被覆管のコーティング膜の厚さは検出コイルのイン
ピーダンスの変化として求められ、被覆管の全長につい
て非破壊的測定が行なわれる。As described above, in the measuring method P and the measuring device of the present invention, the thickness of the coating film on the cladding tube is determined as a change in the impedance of the detection coil, and non-destructive measurement is performed on the entire length of the cladding tube.
以下、本発明の測定方法および測定装置の作用について
説明する。Hereinafter, the action of the measuring method and measuring device of the present invention will be explained.
ｉｇ１図は本発明の核燃料被覆管内面コーティング膜厚
測定方法の測定原理を示す説明図である。Fig. ig1 is an explanatory diagram showing the measurement principle of the method for measuring the thickness of the inner coating of a nuclear fuel cladding tube according to the present invention.
図において、３は高周波電源、４はブリッジ回路で、ブ
リッジ回路４の電源端子には高周波ＩＣ源３の電圧が印
加されている。５および６は検出用のコイルで、それぞ
れのコイルはブリッジ回路４の二辺を形成している。７
および８はそれぞれ基準用被覆管および測定用被覆管で
、コイル５およびコイル６の中を貫通するようになって
いる。９はブリッジ４の出力側測定部で、増幅器、波形
整形回路々どを有する。In the figure, 3 is a high frequency power supply, 4 is a bridge circuit, and the voltage of the high frequency IC source 3 is applied to the power supply terminal of the bridge circuit 4. 5 and 6 are detection coils, and each coil forms two sides of the bridge circuit 4. 7
and 8 are a reference cladding tube and a measurement cladding tube, respectively, which penetrate through the coils 5 and 6. Reference numeral 9 denotes an output side measuring section of the bridge 4, which includes an amplifier, a waveform shaping circuit, and the like.
ブリッジ４に高周波電圧が印加されると、コイル５．コ
イル６に高周波電流が流れ、高周波磁界が発生する。こ
の高周波磁界はコイル５および６を貫通している被６′
ＩＦ７および８と鎖交するから、被覆管７および８に渦
電流が発生する。渦電流が発生するとコイル５，６と被
覆管７．８の間にはそれぞれに電磁誘導作用が生じ、コ
イル５およびコイル６の端子からみたインピーダンスが
変化することになる。この場合、被覆ｆ７，８に生ずる
渦電流は、電源の周波数を一定とすれば、それぞれの材
料が有する導電率、透磁率および直径、内径、肉厚等の
形状によって異なるものとなる。When a high frequency voltage is applied to the bridge 4, the coil 5. A high frequency current flows through the coil 6, and a high frequency magnetic field is generated. This high frequency magnetic field passes through the coils 5 and 6.
Since it interlinks with IFs 7 and 8, eddy currents are generated in the cladding tubes 7 and 8. When an eddy current is generated, electromagnetic induction occurs between the coils 5 and 6 and the cladding tube 7.8, and the impedance seen from the terminals of the coils 5 and 6 changes. In this case, if the frequency of the power supply is constant, the eddy currents generated in the coverings f7 and f8 will vary depending on the electrical conductivity, magnetic permeability, and shape such as diameter, inner diameter, and wall thickness of each material.
したがって被覆管７および８が全く同じ材質。Therefore, the cladding tubes 7 and 8 are made of exactly the same material.
形状のものであるならば、ブリッジ４は平衡状態となり
、測定部９はこれに対応する値を指示する。If the shape is the same, the bridge 4 will be in an equilibrium state, and the measuring unit 9 will indicate a value corresponding to this.
次に被覆管７，８がコーティングの厚さのみ異なり、他
の諸性質が全く同一とすれば、被覆管７゜８の渦電流、
シたがってコイル５．６のインピーダンスがこのコーテ
ィングの厚さによって異るものとなる。この場合、例え
ば被＃Ｗ７にコーティング厚さが既知のものを用い、被
覆管８にはコーティング厚さが未知のものを用いれば、
予め厚さの既知のものについてブリッジ回路４を調整し
ておくことにより、厚さが未知の被覆管８が挿入された
場合の測定部９の指示から、被覆・ａ８のコーティング
の厚さが求められることになる。Next, if the cladding tubes 7 and 8 differ only in the thickness of the coating and other properties are exactly the same, then the eddy current in the cladding tube 7°8,
The impedance of the coil 5.6 therefore varies depending on the thickness of this coating. In this case, for example, if #W7 is used with a known coating thickness, and the cladding tube 8 is used with an unknown coating thickness, then
By adjusting the bridge circuit 4 in advance for a tube of known thickness, the thickness of the coating a8 can be determined from the instructions from the measurement unit 9 when a cladding tube 8 of unknown thickness is inserted. It will be done.
本発明の核燃料被覆管内面コーティング膜厚測定装置は
、上記の渦ｉｌ流に関係する諸要因のうち。The nuclear fuel cladding tube inner surface coating film thickness measuring device of the present invention is capable of measuring the above-mentioned factors related to the vortex flow.
影響の最も大きい導電率の相違を用いてコーティング膜
厚を測定するものである。The coating film thickness is measured using the difference in conductivity that has the greatest influence.
コーティング膜の例としては、被覆管本体をジルカロイ
材とした場合、銅（Ｃｕ）、ニッケル（Ｎ；＋々どが代
表的なものである。これらコーティング膜材の導電率は
、ジルカロイ材の導電率を１．０とした場合、相対導電
率は銅で約４０倍。Typical examples of coating films include copper (Cu), nickel (N), etc. when the cladding tube body is made of Zircaloy material.The electrical conductivity of these coating film materials is the same as that of Zircaloy material. When the conductivity is 1.0, the relative conductivity is approximately 40 times that of copper.
ニッケルで約１０倍となシ、材料によシ導電率に大きな
差がある。この導電率の差を用いれば、コーティング；
漠の厚さを感度よく測定することができる。There are large differences in conductivity depending on the material, such as about 10 times that of nickel. Using this difference in conductivity, coating;
It is possible to measure the thickness of dense areas with high sensitivity.
これらのコーティング材料に通常の渦流探傷器を適用し
て測定すると、渦流探傷器のコイルに生ずる起電力およ
び位相は２材料の導電率によって異なり、ｔたコーティ
ング膜の厚さによって異なるものとなる。したがってコ
ーティング膜厚が既知である標準の被覆管試料を用い、
起電力および位相の変化とコーティング膜厚の関係を校
正しておけば、これらの値と試験用の被覆管を用いたと
きの起電力および位相から、試験用被覆管のコーティン
グ膜の厚さが求められる。When a normal eddy current flaw detector is applied to measure these coating materials, the electromotive force and phase generated in the coil of the eddy current flaw detector differ depending on the electrical conductivity of the two materials and the thickness of the coating film. Therefore, using a standard cladding tube sample with a known coating thickness,
If the relationship between electromotive force and phase change and coating film thickness is calibrated, the coating film thickness of the test cladding tube can be determined from these values and the electromotive force and phase when using the test cladding tube. Desired.
しかし、このように起電力と位相を一々比較していたの
では、製品の連続測定を行なうことはできない。本発明
のＩＪＩ１１定装置ではｍｌｌｌ相定覆管の移動装置を
設け、被覆管を軸方向に移動しつつ基準値と比較するこ
とにより、連続測定を可能としたものである。However, if the electromotive force and phase are compared one by one in this way, it is not possible to continuously measure the product. The IJI11 constant device of the present invention is equipped with a moving device for the mlll phase constant cladding tube, and allows continuous measurement by moving the cladding tube in the axial direction and comparing it with a reference value.
以下１本発明の一実施例を図により説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第２図は本発明の核燃料被覆管内面コーティング膜厚測
定装置の一実施例の説明図である。・官１図と同一部分
には同じ符号がつけられている。FIG. 2 is an explanatory diagram of an embodiment of the nuclear fuel cladding tube inner surface coating film thickness measuring device of the present invention.・The same parts as in the official 1st map are given the same symbols.
図において、１０は回転ローラで、コイル６の両側にと
りつけられ、測定用被覆管８を保持するとともに、被覆
管８がコイル６の中心部を図示の矢印方向に移動するよ
うに回転する。１１は支持具で、基準用の被覆管７の中
心がコイル５の中心と一致するように被覆管７を支持し
、固定するものである。１２は測定部９の表示部である
。In the figure, reference numeral 10 denotes rotating rollers, which are attached to both sides of the coil 6, hold the measurement cladding tube 8, and rotate so that the cladding tube 8 moves around the center of the coil 6 in the direction of the arrow shown in the figure. Reference numeral 11 denotes a support that supports and fixes the cladding tube 7 so that the center of the reference cladding tube 7 coincides with the center of the coil 5. 12 is a display section of the measurement section 9.
この実施例の核燃料被覆管内面コーティング膜厚測定装
置においては、コイル５には基準用の被覆管７が挿入さ
れ、コイル５の内面と被覆管７の外面との間隔が一定と
なるように支持具１１で固定されている。コイル６には
測定用被覆管８を挿入し、これを回転ローラｌＯにより
図の矢印方向に移動して測定位置を変えるよう足してい
る。コイル５および６には高周波電源３からブリッジ回
路４を通して１ｋＨｚ〜１５０ｋＨｚの高周波電圧が印
加される。In the nuclear fuel cladding tube inner surface coating film thickness measuring device of this embodiment, a reference cladding tube 7 is inserted into the coil 5, and is supported so that the distance between the inner surface of the coil 5 and the outer surface of the cladding tube 7 is constant. It is fixed with a tool 11. A measurement cladding tube 8 is inserted into the coil 6, and is moved by a rotating roller 10 in the direction of the arrow in the figure to change the measurement position. A high frequency voltage of 1 kHz to 150 kHz is applied to the coils 5 and 6 from the high frequency power supply 3 through the bridge circuit 4.
高周波電圧が印加されるとコイル５および６には高周波
磁界が生じ、被覆管７および８とそれぞれの被覆管のコ
ーティング膜に渦電流が発生する。When a high frequency voltage is applied, a high frequency magnetic field is generated in the coils 5 and 6, and eddy currents are generated in the cladding tubes 7 and 8 and the coating film of each cladding tube.
渦′１流が発生すると前記の測定原理で述べたように、
この渦電流とコイルα流の間に電磁誘導作用が生じ、コ
イル５．６と鎖父する磁束が変化し。As stated in the measurement principle above, when a vortex '1 flow occurs,
Electromagnetic induction occurs between this eddy current and the coil α current, and the magnetic flux chained to the coil 5.6 changes.
コイル５，６のインピーダンスが変化するから。This is because the impedance of coils 5 and 6 changes.
このインピーダンス変化をブリッジ回路４１Ｃより検出
し、測定部９を通して表示部１２でアナログあるいはデ
ィジタルに表示することにより、コーティング膜の厚さ
を測定することができる。被覆管７および８の本体の性
質は全く同一であり、異なるのはコーティング膜の厚さ
のみであるから、表示部１２には、コーティング膜の厚
さが表示されることになる。The thickness of the coating film can be measured by detecting this impedance change by the bridge circuit 41C and displaying it in analog or digital form on the display section 12 through the measuring section 9. Since the properties of the bodies of the cladding tubes 7 and 8 are exactly the same, and only the thickness of the coating film differs, the thickness of the coating film is displayed on the display section 12.
測定の手順は、予めコイル５，６に同一形状の基準用被
覆管を挿入し、ブリッジ回路４の平衡をとり、基準とな
る出力を求めておく。次にコイル６に挿入されている基
準用被１管を抜きとり、代シに測定しようとする被覆管
を挿入し、この被覆管をその軸方向に移動し、このとき
生ずる不平衡電圧を−ｊ定１表示する。この不平衡時の
表示を先に求めた平衡時の基準の値と比較することによ
り、測定しようとする被覆管のコーティングの膜厚を求
めることができる。The measurement procedure is to insert reference cladding tubes of the same shape into the coils 5 and 6 in advance, balance the bridge circuit 4, and obtain a reference output. Next, remove the reference tube inserted into the coil 6, insert the cladding tube to be measured in its place, move this cladding tube in its axial direction, and measure the unbalanced voltage generated at this time. j constant 1 display. By comparing the display at the time of unbalance with the reference value at the time of equilibrium determined previously, the film thickness of the coating of the cladding tube to be measured can be determined.
このようＫしてコーティング膜を損傷することなく、被
覆管の全長について精度よくコーティング膜厚を測定す
ることが可能となる。In this manner, it is possible to accurately measure the coating film thickness over the entire length of the cladding tube without damaging the coating film.
以上のように本発明の測定方法を用いるときは、被（ｌ
Ｉ−Ｗをコイルに挿入するだけで容易にコーティングの
膜厚を測定することができるので１例えば被覆管に燃料
ベレットが充填されている核燃料棒に対しても適用する
ことが可能となる。As described above, when using the measurement method of the present invention,
Since the thickness of the coating can be easily measured by simply inserting the I-W into the coil, it can also be applied to, for example, nuclear fuel rods whose cladding tubes are filled with fuel pellets.
また本発明の測定装置を用いるときは・被覆管の支持具
に回転ローラを用いており、被覆管の移動を円滑に行な
うととも罠、被覆管と検出用コイルとの間隔を旧しく保
つことができるので、被覆管の製品試験を連続的に精度
よく行なうことができる。In addition, when using the measuring device of the present invention, a rotating roller is used as a support for the cladding tube, so that the cladding tube can be moved smoothly and the distance between the trap, the cladding tube, and the detection coil must be maintained as before. As a result, product tests on cladding tubes can be performed continuously and accurately.
すなわち４″発明により、被覆管内面のコーティング膜
の厚さを被覆管とは無接触で測定でき、被覆管の内外面
を損傷することなく、その全長について測定することが
できるので、コーティング膜厚の均一性を正確に他種す
ることが容易となり。In other words, according to the 4'' invention, the thickness of the coating film on the inner surface of the cladding tube can be measured without contacting the cladding tube, and the entire length of the cladding tube can be measured without damaging the inner and outer surfaces of the cladding tube. The uniformity of the material makes it easy to accurately differentiate other species.
燃料棒の破損防止に極めて有効であり、プラントの安全
性向上に大きく寄与することができる。It is extremely effective in preventing damage to fuel rods and can greatly contribute to improving plant safety.
本発明によれば、被覆管内面のコーティングの膜厚を、
無接触で精度よく測定可能な核燃料被覆管内面コーティ
ング膜厚測定方法および測定装置を提供することができ
る。According to the present invention, the thickness of the coating on the inner surface of the cladding tube is
It is possible to provide a method and apparatus for measuring the thickness of a nuclear fuel cladding inner surface coating that can be measured accurately without contact.
【図面の簡単な説明】
第１図は本発明の核燃料被覆管内面コーティング膜厚測
定方法の測定原理説明図、第２図は本発明の核燃料被覆
管内面コーティング膜厚測定装置の一実施例の説明図、
第３図は従来のコーティング膜厚測定方法を適用する実
施例の説明図でちる。
３・・・高周波電源、４・・・ブリッジ回路、５．６・
・・検出用コイル、７・・・基準用被覆、８・・・測定
用被覆管、９・・・測定部、１０・・・回転ローラ、１
１・・・支持具、帛２図
１０−ｍ−口享乙０−ラ
１２− 未木郁[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of the measurement principle of the method for measuring the thickness of the inner coating of a nuclear fuel cladding tube according to the present invention, and Fig. 2 is an illustration of an embodiment of the apparatus for measuring the thickness of the inner coating of a nuclear fuel cladding tube of the present invention. Explanatory diagram,
FIG. 3 is an explanatory diagram of an embodiment to which a conventional coating film thickness measuring method is applied. 3...High frequency power supply, 4...Bridge circuit, 5.6.
...Detection coil, 7.Reference coating, 8.Measurement cladding tube, 9.Measurement section, 10.Rotating roller, 1
1...Support, cloth 2 Figure 10-m-kuchikyotsu0-ra12-Iku Miki
Claims (1)
体とは異なる導電率を有するコーティング膜の厚さを測
定する方法において、前記核燃料被覆管の外側に貫通形
のコイルを設け、該コイルに交番電流を印加し、前記コ
ーティング膜と鎖交する交番磁界を発生させ、前記コー
ティング膜内に生ずる渦電流により生ずるインピーダン
スの変化を標準の核燃料被覆管を用いて得られるインピ
ーダンスと比較し、前記コーティング膜の厚さを測定す
ることを特徴とする核燃料被覆管内面コーティング膜厚
測定方法。 ２、核燃料被覆管の内面に被覆され、該核燃料被覆管本
体とは異なる導電率を有するコーティング膜の厚さを測
定する装置において、標準核燃料被覆管を支持する支持
具と、試験用該燃料被覆管をその軸方向に移動する移動
体と、前記標準核燃料被覆管および前記試験用核燃料被
覆管がそれぞれ貫通する貫通形コイルと、該貫通形コイ
ルに高周波を印加する高周波電源と、それぞれの貫通形
コイルに生ずるインピーダンスの変化を検出比較する比
較手段と、該比較手段の出力を測定する測定手段とが設
けてあることを特徴とする核燃料被覆管内面コーティン
グ膜厚測定装置。[Claims] 1. In a method for measuring the thickness of a coating film coated on the inner surface of a nuclear fuel cladding tube and having a conductivity different from that of the nuclear fuel cladding tube body, a penetrating film is provided on the outside of the nuclear fuel cladding tube. A coil is provided, an alternating current is applied to the coil to generate an alternating magnetic field interlinking with the coating film, and a change in impedance caused by an eddy current generated in the coating film can be obtained using a standard nuclear fuel cladding tube. A method for measuring the thickness of an inner surface coating of a nuclear fuel cladding tube, the method comprising measuring the thickness of the coating by comparing it with impedance. 2. In an apparatus for measuring the thickness of a coating film coated on the inner surface of a nuclear fuel cladding tube and having a conductivity different from that of the nuclear fuel cladding tube body, a support for supporting a standard nuclear fuel cladding tube, and the fuel cladding for testing. A moving body that moves a tube in its axial direction, a through-type coil through which the standard nuclear fuel cladding tube and the test nuclear fuel cladding tube pass through, a high-frequency power source that applies a high frequency to the through-type coil, and each through-type coil. 1. A nuclear fuel cladding tube inner surface coating film thickness measuring device, comprising a comparing means for detecting and comparing changes in impedance occurring in a coil, and a measuring means for measuring an output of the comparing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8800786A JPS62245902A (en) | 1986-04-18 | 1986-04-18 | Method and device for measuring thickness of internal surface coating film of cladding tube of nuclear fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8800786A JPS62245902A (en) | 1986-04-18 | 1986-04-18 | Method and device for measuring thickness of internal surface coating film of cladding tube of nuclear fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62245902A true JPS62245902A (en) | 1987-10-27 |
Family
ID=13930745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8800786A Pending JPS62245902A (en) | 1986-04-18 | 1986-04-18 | Method and device for measuring thickness of internal surface coating film of cladding tube of nuclear fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62245902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ306012B6 (en) * | 2014-09-03 | 2016-06-22 | Vysoké Učení Technické V Brně | Non-destructive indicator of local subsurface non-homogeneities |
-
1986
- 1986-04-18 JP JP8800786A patent/JPS62245902A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ306012B6 (en) * | 2014-09-03 | 2016-06-22 | Vysoké Učení Technické V Brně | Non-destructive indicator of local subsurface non-homogeneities |
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