JPH0262959A - Method of measuring content of gadolinium in fuel rod for nuclear reactor - Google Patents

Method of measuring content of gadolinium in fuel rod for nuclear reactor

Info

Publication number
JPH0262959A
JPH0262959A JP63214634A JP21463488A JPH0262959A JP H0262959 A JPH0262959 A JP H0262959A JP 63214634 A JP63214634 A JP 63214634A JP 21463488 A JP21463488 A JP 21463488A JP H0262959 A JPH0262959 A JP H0262959A
Authority
JP
Japan
Prior art keywords
magnetic field
fuel rod
coil
gadolinia
measuring
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.)
Granted
Application number
JP63214634A
Other languages
Japanese (ja)
Other versions
JPH07122629B2 (en
Inventor
Masafumi Yoshida
政史 吉田
Shinzo Ogura
小倉　新三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Nuclear Fuel Co Ltd
Original Assignee
Mitsubishi Nuclear Fuel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Nuclear Fuel Co Ltd filed Critical Mitsubishi Nuclear Fuel Co Ltd
Priority to JP63214634A priority Critical patent/JPH07122629B2/en
Publication of JPH0262959A publication Critical patent/JPH0262959A/en
Publication of JPH07122629B2 publication Critical patent/JPH07122629B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

PURPOSE:To eliminate the influence of a ferromagnetic material coexisting in pellets and to allow sure and smooth measurement by combining a DC magnetic field which is small to the extent of not saturating the ferromagnetic material and AC magnetic field. CONSTITUTION:A coil 2 for generating the AC magnetic fields is disposed concentrically in a coil 1 for generating the AC magnetic field and a pair of search coils 3, 4 for reference and measurement are installed in parallel therein. A fuel rod 5 to be measured is constituted by packing the plural pellets 7 into a hollow bar-shaped cladding pipe 6 by means of a coil spring 8 which presses the pellets and sealing both ends thereof by a pair of end plugs 9, 10 and is inserted with the coil 4. A reference pipe 11 which has the same structure as the structure of the cladding pipe 6 and is made of the same material as the material of the cladding pipe is inserted into the coil 3. The voltage induced in the coils 3, 4 is taken out as the differential voltage of the search coils. The content of gadolinium is calculated by eliminating the influence of the ferromagnetic material in accordance with the measurement data obtd. in such a manner.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、原子炉用燃料棒内に収納されたペレ、ノドが
含有しているガドリニアの含有量を測定するための原子
炉用燃料棒のガドリニア含有量測定方法に係り、さらに
詳しくは、強磁性体中に存在するガドリニア（常磁性体
）の含有量を、磁化率の変化を用いて測定するガドリニ
ア含有量測定方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nuclear reactor fuel rod for measuring the content of gadolinia contained in pellets and throats housed in the nuclear reactor fuel rod. The present invention relates to a method for measuring gadolinia content, and more specifically, to a method for measuring gadolinia content in which the content of gadolinia (paramagnetic material) present in a ferromagnetic material is measured using a change in magnetic susceptibility.

〔従来の技術〕[Conventional technology]

従来、この匝のガドリニア含有量測定方法としては、二
酸化ウラン、ガドリニアおよび強磁性混在物かろ成る燃
料ペレット中の前記強磁性混在物を飽和させるのに十分
な時間的に一定の磁界を設定し、前記の時間的に一定の
磁界に対し、−様な交番磁界をほぼ同軸的に重ね合わせ
、逆向きに直列接続されたＬ対のピックアップコイルを
前記交番磁界中に配置し、前記ビノクア、プコイルの一
方に前記燃料ペレットを結合し、それから前記燃料ペレ
ット１こよってｌＷｏ己ピックアップコイル導された交
流不平衡電圧を測定することにより、前訂燃料ペレット
の磁化率が誘導技術に基づいて測定されかつ前記強磁性
混在物に起因する測定誤りが無風できるレベルにまで低
減されるものが知られている（特開昭５３−９５４９４
号公報参照）〔全町が解決しようとする課題〕 しかしながら、上付従来のガドリニア含有量爪；１定方
法にあっては、燃料ペレット内に混在している強磁性体
を飽和させるのに十分な直流磁界を加える必要があるた
めに、直流磁界を発生するための永久磁石、あるいはコ
イルとして、大型、かつ強力なものを用意しなければな
らないという問題がある。Conventionally, the method for measuring the gadolinia content in this bag is to set a constant magnetic field over a period of time sufficient to saturate the ferromagnetic inclusions in the fuel pellets consisting of uranium dioxide, gadolinia, and ferromagnetic inclusions; A negative alternating magnetic field is superimposed almost coaxially on the temporally constant magnetic field, and L pairs of pick-up coils connected in series in opposite directions are arranged in the alternating magnetic field. The magnetic susceptibility of the fuel pellet is measured based on inductive techniques by coupling the fuel pellet to one side and then measuring the alternating unbalanced voltage induced by the fuel pellet 1 through the pickup coil. It is known that measurement errors caused by ferromagnetic inclusions can be reduced to a level where no wind can be detected (Japanese Patent Laid-Open No. 53-95494).
(Refer to Publication No.) [The issue that the whole town is trying to solve] However, in the conventional overlaying method, the gadolinia content is insufficient to saturate the ferromagnetic material mixed in the fuel pellets. Since it is necessary to apply a strong DC magnetic field, there is a problem in that a large and powerful permanent magnet or coil must be prepared for generating the DC magnetic field.

本発明は、上記事情に鑑みてなされたもので、その目的
とするところは、ペレット内に混在している強磁性体を
飽和させない程度の小さい直）Ａｔ磁界と、交施＠界と
を組み合わせることによって、上記強磁性体による影響
を排除でき、確実にか一つ円滑にペレット中に含まれる
ガドリニアの含有量を測定することができる原子炉用燃
料棒のガＩ’　ＩＪニア含有量爪１１定方法を毘供する
ことにある。The present invention has been made in view of the above circumstances, and its purpose is to combine a small direct At magnetic field that does not saturate the ferromagnetic material mixed in the pellet with an alternating @ field. By this, the influence of the ferromagnetic material can be eliminated, and the content of gadolinia contained in the pellet can be measured reliably and smoothly. The aim is to provide a method for determining

〔課題を解決するための手段〕[Means to solve the problem]

北紀目的を達成するために、本発明の請求項１は、１個
ずつの交流磁界発生用コイル及び直流磁界発生−用装置
の内部のガドリニア測定位毘に上記燃料棒を停止させ、
」二記交流磁界発生用コイルの連続】皿電中に、上紀荘
流磁界発生用装置をオンオフ操作することにより、基準
管を挿入した基準サーチフィルと上記燃料棒を挿入した
測定用サーチコイルとの差電圧を測定し、これらの測定
データに基づいてペレット中のガドリニアの含有量を算
出するものである。In order to achieve the object of the present invention, claim 1 of the present invention provides that the fuel rod is stopped at a gadolinia measurement position inside each AC magnetic field generation coil and DC magnetic field generation device,
2. Continuation of alternating current magnetic field generation coil] By turning on and off the Jokisho style magnetic field generation device in the dishwasher, a reference search fill with a reference tube inserted and a measurement search coil with the above fuel rod inserted are created. The gadolinia content in the pellet is calculated based on the measured data.

また、本発明の請求項２は上記請求項１の測定に先立っ
て、直流磁界、あるいは交流磁界発生用フィルのいずれ
か一方のみを常時通電した状態で、このコイル内に燃料
棒を一定速度で通過させ、サーチコイル差電圧が所定電
圧より異なった電圧を発生した場合に、その燃料棒の異
常電圧発生箇所をガドリニ゛ｒ測定位置に停止させ、ガ
ドリニアの含有量を測定するものである。In addition, the second aspect of the present invention is that, prior to the measurement of the first aspect, the fuel rod is inserted into the coil at a constant speed while only one of the DC magnetic field and the alternating current magnetic field generating filter is constantly energized. When the search coil differential voltage generates a voltage different from a predetermined voltage, the fuel rod is stopped at the gadolinia measurement position at the location where the abnormal voltage occurs, and the gadolinia content is measured.

さらに、本発明の請求項３は、直流磁界発生用装置を連
続通電した状態で、この直流磁界発生用装置内に燃料棒
を一定速度で通過させ、基僧管を挿入した基部サーチコ
イルと上記燃料棒を挿入しているｉｌｔｌｌ　定用サー
チコイルとの差電圧を測定すると共に、上記直流磁界発
生用装置と交流磁界発生用コイルとの内部に上記燃料棒
を停止させ、」二記直ｌ！ｌシ磁界発生用装置の通電と
ともに上記交流磁界発生用コイルにｊ瓜電することによ
り、上記両サーチコイル間の差電圧を測定し、これらの
差電圧の洪［定データに基づいてガドリニアの含イイ電
を算出するものである。Furthermore, claim 3 of the present invention provides a base search coil in which a fuel rod is passed through the DC magnetic field generating device at a constant speed while the DC magnetic field generating device is continuously energized, and the base search coil is inserted with the base tube. Measure the voltage difference between the Iltll regular search coil into which the fuel rod is inserted, and stop the fuel rod inside the DC magnetic field generation device and the AC magnetic field generation coil. By energizing the magnetic field generating device and energizing the alternating current magnetic field generating coil, the voltage difference between the two search coils is measured, and the difference in voltage between these two search coils is calculated based on the constant data. It calculates good electricity.

〔作　用〕[For production]

不発０井の原子炉ｆＴ１燃料燃料棒ドリニア含有量１創
定方法にあっては、１個ずつの交流磁界発生用コイルと
直流磁界発生用装置の内部に燃料棒を挿入し、」二記交
流磁界発生用コイルの連続通′・■で直流＠Ｗ発生川用
辻のオンオフ操作（または、直流磁界発生用装置の連続
通電で交流磁界発生用コイルのオンオフ操作）により、
基準管を挿入した基やサーチコイルと上記燃料棒を挿入
した測定用サーチコイルとの差電圧をそれぞれ測定し、
これらの差電圧の測定データに基づいて強磁性体による
影響を排除してガドリニアの含有量を算出する。In the method for creating a fuel rod with a dolinear content of 1 for an unexploded 0-well nuclear reactor fT1, a fuel rod is inserted into each of an AC magnetic field generation coil and a DC magnetic field generation device, and Continuously energize the magnetic field generating coil to turn on/off the DC @W generator (or turn on/off the alternating current magnetic field generating coil by continuously energizing the DC magnetic field generating device).
Measure the differential voltage between the base or search coil into which the reference tube was inserted and the measurement search coil into which the fuel rod was inserted,
Based on the measurement data of these differential voltages, the gadolinia content is calculated by excluding the influence of the ferromagnetic material.

〔実施例〕〔Example〕

以下−第り図ないし第３図に基づいて本発明の一実施例
を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

第１阻は本発明のガドリニア含有量１１ｔ１１定方法を
実施するための装置の一例を示す概略構成図である。こ
の図において符号［は直ｍ　Ｍｉ界発生用コイルであり
、この直流磁界発生用コイル１の内部には同心状に交流
磁界発生用コイル２が配置されている。また、この交流
磁界発生用コイル２の内部には、一対の基準サーチコイ
ル３と測定用サーチコイル４とが並んで設置されている
。そして、測定用サーチコイル４には、被測定対象の燃
料棒５が挿通されている。この燃料棒５は、中空棒状の
彼１管６と、その内部に充填された複数個のペレット７
と、このペレット７を押えるコイルばね８と、被覆管６
の両端を封止する一対の端栓９．ｌＯとを主体として構
成されている。さらに、上記基準サーチコイル３には、
上記被覆管６と同構造、同材質の基準管１ｔが挿通され
ている。そして、上記両サーチコイル３．４に誘起され
た電圧はサーチコイル差電圧Ｖａ、Ｖｂとして取り出さ
れる。The first diagram is a schematic configuration diagram showing an example of an apparatus for carrying out the method for determining gadolinia content 11t11 of the present invention. In this figure, the reference numeral [ is a direct m Mi field generating coil, and an alternating current magnetic field generating coil 2 is arranged concentrically inside this direct current magnetic field generating coil 1 . Further, inside this alternating current magnetic field generating coil 2, a pair of reference search coil 3 and measurement search coil 4 are installed side by side. A fuel rod 5 to be measured is inserted into the measurement search coil 4 . This fuel rod 5 consists of a hollow rod-shaped tube 6 and a plurality of pellets 7 filled inside the tube.
, a coil spring 8 that presses down this pellet 7, and a cladding tube 6.
A pair of end plugs for sealing both ends of 9. It is mainly composed of IO. Furthermore, the reference search coil 3 includes:
A reference tube 1t having the same structure and the same material as the cladding tube 6 is inserted. Then, the voltage induced in both search coils 3.4 is taken out as a search coil difference voltage Va, Vb.

上記のように構成された測定装置を用いて本発明の方法
を実施する場合には、第１図において、交流磁界発生用
コイル２に連続通電して交流磁界をかけると共に、直流
磁界発生用コイル１に通電してｕＬ［Ｌ磁界を電型した
場合と、直流磁界を印加しない場合とについて、それぞ
れ、測定用サーチコイル４と基準サーチコイル３との差
電圧を測定する。When carrying out the method of the present invention using the measuring device configured as described above, in FIG. The difference voltage between the measurement search coil 4 and the reference search coil 3 is measured in the case where the uL[L magnetic field is generated by applying current to the probe 1 and the case where no direct current magnetic field is applied.

まず、交流磁界と直流磁界を重畳した場合の測定用サー
チコイル４と基準サーチコイル３との差電圧Ｖａは次式
で示される。First, the difference voltage Va between the measurement search coil 4 and the reference search coil 3 when an AC magnetic field and a DC magnetic field are superimposed is expressed by the following equation.

ｙ　ａ　ユ３　ｎ　１．ｄ　Ｍ　ｎ　ａ　　３　＋　１
　、　ｄ　Ｍ　ｉａ　９１．（１）ｄｔ　　　　　　　
　　　　　　ｄｔ ただし、上式において、Ｍｎａはペレット７に含まれて
いる常磁性体の交流磁界と直流磁界との重畳磁界による
磁化の強さ、Ｍｉａはペレット７に含まれている強磁性
体の重畳磁界による磁化の強さ、Ｓｎｌは常磁性体の磁
化によりサーチコイルと鎖交する磁束に対する等価断面
積、Ｓｉｌは強磁性体の磁イヒによりサーチコイルと鎖
交する磁束に対する等価断面積である。y a yu3 n 1. d M na 3 + 1
, d M ia 91. (1) dt
dt However, in the above equation, Mna is the strength of magnetization due to the superimposed magnetic field of the alternating current magnetic field and the direct current magnetic field of the paramagnetic material contained in the pellet 7, and Mia is the superimposed magnetic field of the ferromagnetic material contained in the pellet 7. Snl is the equivalent cross-sectional area for the magnetic flux that interlinks with the search coil due to the magnetization of the paramagnetic material, and Sil is the equivalent cross-sectional area for the magnetic flux that interlinks with the search coil due to the magnetization of the ferromagnetic material.

また、交流磁界のみを印加する場合の測定用サーチコイ
ル４と基準サーチコイル３との差電圧■ｂも同様に表さ
れる。すなわち、 ｄ　Ｍ　ｎｂ　　　１．ｄＭｉｂ−（２）Ｖｂ＝　−８
ｎ　　Ｌ　　−−３１１ ｄｉ　　　　　　　　　　　　　ｄｔ ここで、Ｍｎｂはペレット７に含まれている常磁性体の
交流磁界による磁化の強さ、Ｍｉｂはペレット７に含ま
れている強磁性体の交流磁界による磁化の強さである。Furthermore, the differential voltage (b) between the measurement search coil 4 and the reference search coil 3 when only an alternating magnetic field is applied is similarly expressed. That is, d M nb 1. dMib-(2)Vb=-8
n L --311 di dt Here, Mnb is the magnetization strength due to the alternating magnetic field of the paramagnetic material contained in the pellet 7, and Mib is the magnetization strength due to the alternating current magnetic field of the ferromagnetic material contained in the pellet 7. It is.

そして、ガドリニア等の常磁性体の磁化の強さは、直流
磁界の影響を受けないことから、Ｖａとｖｂとの差電圧
Ｖａｂは強磁性体含有量に相当する。Since the magnetization strength of a paramagnetic material such as gadolinia is not affected by a DC magnetic field, the difference voltage Vab between Va and vb corresponds to the ferromagnetic material content.

すなわち、 Ｖａｂ＝−３ｉ　Ｌ　・（ｄＭｉａ−ｄＭ”）　　　＝
１３）ｄｔ　　　　　ｄｔ この差電圧Ｖａｂは上記（１）式の第２項に対応するこ
とから、ＶａとＶａｂとによって、常磁性体含有量、つ
まり、ガドリニア含有量に換算できる電圧Ｖ。は、下式
で表される。That is, Vab=-3i L ・(dMia-dM") =
13) dt dt Since this differential voltage Vab corresponds to the second term of the above equation (1), the voltage V can be converted into the paramagnetic content, that is, the gadolinia content, by Va and Vab. is expressed by the following formula.

Ｖｏ＝−Ｋｌ−Ｖａ−に２・Ｖａｂ＋Ｃ−（４）ただし
、Ｋｌ、に、２及びＣは実験によって求められる定数で
ある。Vo=−Kl−Va−2·Vab+C−(4) However, Kl, 2, and C are constants determined by experiment.

次に、本発明の方法に基づいて具体的に実験した結果に
ついて述べると、まず、ペレット７に強１ｉ１ｔ！一体
が含有されている場合のサーチコイル差電圧Ｖａと直流
磁界との関係は、第２図に示すような特性を示している
。ここで、ガドリニア含有量は６％であった。この図に
おいて、強磁性体含有量が多いほど差電圧Ｖａは大きく
なり、また、直流磁界を加えるほど、磁化率が小さくな
り、従って、差電圧Ｖａが小さくなっていることがわか
る。Next, the results of a specific experiment based on the method of the present invention will be described. First, pellet 7 has a strong 1i1t! The relationship between the search coil differential voltage Va and the DC magnetic field in the case where an integral component is included exhibits a characteristic as shown in FIG. Here, the gadolinia content was 6%. In this figure, it can be seen that the higher the ferromagnetic content, the higher the differential voltage Va, and the more a DC magnetic field is applied, the lower the magnetic susceptibility becomes, and therefore the lower the differential voltage Va.

また、上記（４）式のＶａ、Ｖａｂの関係を実験から求
め、その特性直線を第３図に示す。この図に基づいて、
例えば、ガドリニア（Ｇｄ）含有量８％、強磁性体含有
ｔｌｏｏｐｐｍのペレット７を用いて、第１図に示す測
定装置によって、Ｖａ。Further, the relationship between Va and Vab in the above equation (4) was determined through experiments, and its characteristic line is shown in FIG. Based on this diagram,
For example, using pellets 7 of tlooppm containing ferromagnetic material and having a gadolinia (Gd) content of 8%, Va.

Ｖａｂを計画すると、Ｖａ＝ｌ、６９Ｖ、Ｖａｂ＝００
９Ｖを得た。従って、これらのＶａ、ＶａｂＯ値により
、第３図を用いてガドリニア含有量を推定すると７．９
％となり、略実際の値８％に一致するから、本方法の妥
当性が示された。When planning Vab, Va=l, 69V, Vab=00
Obtained 9V. Therefore, using these Va and VabO values and estimating the gadolinia content using Figure 3, it is 7.9
%, which approximately corresponds to the actual value of 8%, demonstrating the validity of this method.

なお、燃料棒５内のペレット７に含まれるガドリニア量
を上記実施例に基づいて算出するのに先立って、燃料棒
５のどの部位を測定するかを判断するためには、直流磁
界発生用コイルあるいは交流磁界発生用コイルのうち一
方のみを常時通電した状態で、このコイル内に被測定対
象の燃料棒を一定速度で通過させる。この際、上記燃料
棒内のあるペレットに含まれる強磁性体、あるいは常磁
性体の１が（伽のペレットと異なる場合には、ペレット
の部分においてサーチコイル差電圧が異なった電圧を発
生するため、この部分（異常電圧発生箇所）を、第り図
に示す測定装置の測定位置に停止させてガドリニア量を
測定すればよい。In addition, in order to determine which part of the fuel rod 5 to measure before calculating the amount of gadolinia contained in the pellets 7 in the fuel rod 5 based on the above embodiment, it is necessary to Alternatively, only one of the alternating current magnetic field generating coils is energized at all times, and the fuel rod to be measured is passed through the coil at a constant speed. At this time, if the ferromagnetic material or paramagnetic material 1 contained in a certain pellet in the fuel rod is different from the pellet, the search coil difference voltage will generate a different voltage in the pellet part. The amount of gadolinia may be measured by stopping this part (the location where abnormal voltage occurs) at the measuring position of the measuring device shown in FIG.

また、上記実施例においては、交流磁界印加中に直流磁
界をオンオフ操作することにより、ペレット中のガドリ
ニア含有−を算出したが、これに限らず、直流磁界発生
用コイル１を連続通電した状態で、この直流磁界発生用
コイル１内に燃料棒５を一定速度で通過させ、サーチコ
イル差電圧を測定すると共に、両磁界発生用コイル１，
２゛の内部に上記燃料棒５を停止させ、各磁界発生用コ
イルＬ、　　Ｚにともに通電することにより、サーチコ
イル差電圧を測定し、これらのサーチコイル差電千の１
１ｔ１１定データに基づいてペレット７中に含まれる強
磁性体による影響を排除して、ガドリニア含有量を算出
してもよい。In addition, in the above embodiment, the gadolinia content in the pellet was calculated by turning on and off the DC magnetic field while applying the AC magnetic field, but the present invention is not limited to this. , the fuel rod 5 is passed through the DC magnetic field generating coil 1 at a constant speed, the search coil difference voltage is measured, and both magnetic field generating coils 1,
The fuel rod 5 is stopped inside the coil 2, and the search coil difference voltage is measured by energizing both the magnetic field generating coils L and Z.
The gadolinia content may be calculated based on the 1t11 constant data, excluding the influence of the ferromagnetic material contained in the pellet 7.

又、１把実権例においては、直〆Ａｔ磁界発生用として
コイルを用いるが磁石を用いても同様である。Further, in the first example, a coil is used to generate the direct At magnetic field, but a magnet may also be used.

そして、磁石の移動により直流磁界印加場所の直流磁界
のオンオフ制御をすることも可能である。It is also possible to control on/off of the DC magnetic field at the location where the DC magnetic field is applied by moving the magnet.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は、１個ずつの交流磁界発
生用コイルと直流磁界発生用コイルの内部に燃料棒を挿
入し、上記交流磁界発生用コイルの連続通電で直流磁界
発生用コイルのオンオフ操作（または、直流磁界発生用
コイルの連続通電で交流磁界発生用コイルのオンオフ操
作）により、基準管を挿入した基準サーチコイルと上記
燃料棒を挿入した測定用サーチコイルとの差電圧をそれ
ぞれ測定し、これらの差電圧の測定データに基づいて強
磁性体による影響を排除してガドリニアの含有量を算出
することにより、ペレット内ｉｎ！在している強磁性体
を飽和させない程度の小さい直流磁界を用いて、確実に
かつ円滑にペレット中に含まれるガドリニアの含有量を
測定することができ、１１発生用コイルが小型のもので
よく、かつ測定データからガドリニア含有量を算出する
処理が差動等の簡単な処理でよいという浸れた効果を有
する。As explained above, in the present invention, fuel rods are inserted into each of the AC magnetic field generation coil and the DC magnetic field generation coil, and the DC magnetic field generation coil is continuously energized by the AC magnetic field generation coil. By on/off operation (or on/off operation of the AC magnetic field generation coil by continuous energization of the DC magnetic field generation coil), the difference voltage between the reference search coil into which the reference tube is inserted and the measurement search coil into which the fuel rod is inserted is determined. By calculating the gadolinia content by eliminating the influence of ferromagnetic material based on the measurement data of these differential voltages, the in! The content of gadolinia contained in pellets can be reliably and smoothly measured using a small DC magnetic field that does not saturate the existing ferromagnetic material, and the generation coil 11 can be small. , and has the advantageous effect that the process of calculating the gadolinia content from the measured data requires simple processing such as differential operation.

【図面の簡単な説明】[Brief explanation of the drawing]

第り図は本発明の方法を実施するための測定装置の一例
を示す概略構成図、第２図と第３図は本発明の一実施例
の特性を示すもので、第２図はサーチコイル差電圧と直
流磁界との関係を示す特性図、第３図はサーチコイル差
電圧特性によるガドリニア含有量の測定を示す特性図で
ある。 １・・・・・・直流磁界発生用コイル、２・・・・・交
ｔｌｌｔ磁界発生用コイル、３・・・・基準サーチコイ
ル、 ４・・・・・測定用サーチコイル、 ５・・・・・・燃料棒、 ７・・・・・・ペレット、 ＬＬ・・・・・・基準管。Fig. 2 is a schematic configuration diagram showing an example of a measuring device for carrying out the method of the present invention, Figs. 2 and 3 show characteristics of an embodiment of the present invention, and Fig. 2 shows a search coil. FIG. 3 is a characteristic diagram showing the relationship between differential voltage and DC magnetic field, and FIG. 3 is a characteristic diagram showing measurement of gadolinia content based on search coil differential voltage characteristics. 1... Coil for generating DC magnetic field, 2... Coil for generating AC tllt magnetic field, 3... Reference search coil, 4... Search coil for measurement, 5... ...Fuel rod, 7...Pellet, LL...Reference tube.

Claims (3)

【特許請求の範囲】[Claims] （１）燃料棒内に収納されたペレットが含有しているガ
ドリニアの含有量を測定するための原子炉用燃料棒のガ
ドリニア含有量測定方法において、１個ずつの交流磁界
発生用コイル及び直流磁界発生用装置の内部のガドリニ
ア測定位置に上記燃料棒を停止させ、上記交流磁界発生
用コイルの連続通電中に、上記直流磁界発生用装置をオ
ンオフ操作することにより、基準管を挿入した基準サー
チコイルと上記燃料棒を挿入した測定用サーチコイルと
の差電圧を測定し、これらの測定データに基づいてペレ
ット中のガドリニアの含有量を算出することを特徴とす
る原子炉用燃料棒のガドリニア含有量測定方法。(1) In a method for measuring gadolinia content in a nuclear reactor fuel rod for measuring the gadolinia content contained in pellets housed in a fuel rod, each coil for generating an alternating current magnetic field and a direct current magnetic field are The fuel rod is stopped at the gadolinia measurement position inside the generation device, and the DC magnetic field generation device is turned on and off while the AC magnetic field generation coil is continuously energized to generate a reference search coil into which the reference tube is inserted. gadolinia content in a fuel rod for a nuclear reactor, characterized in that the differential voltage between the fuel rod and a measurement search coil into which the fuel rod is inserted is measured, and the gadolinia content in the pellet is calculated based on these measurement data. Measuring method. （２）直流磁界発生用装置あるいは交流磁界発生用コイ
ルのいずれか一方のみを常時通電した状態で、このコイ
ル内に燃料棒を一定速度で通過させ、サーチコイル差電
圧が所定電圧より異なった電圧を発生した場合に、その
燃料棒の異常電圧発生箇所をガドリニア測定位置に停止
させ、請求項１記載の測定を行うことを特徴とする原子
炉用燃料棒のガドリニア含有量測定方法。(2) With only either the DC magnetic field generating device or the AC magnetic field generating coil always energized, a fuel rod is passed through this coil at a constant speed, and the search coil difference voltage is a voltage different from the predetermined voltage. 2. A method for measuring gadolinia content in a fuel rod for a nuclear reactor, characterized in that, when abnormal voltage occurs, the abnormal voltage occurring point of the fuel rod is stopped at a gadolinia measurement position and the measurement according to claim 1 is performed. （３）燃料棒内に収納されたペレットが含有しているガ
ドリニアの含有量を測定するための原子炉用燃料棒のガ
ドリニア含有量測定方法において、直流磁界発生用装置
を連続通電した状態で、この直流磁界発生用装置内に燃
料棒を一定速度で通過させ、基準管を挿入した基準サー
チコイルと上記燃料棒を挿入している測定用サーチコイ
ルとの差電圧を測定すると共に、上記直流磁界発生用装
置と交流磁界発生用コイルとの内部に上記燃料棒を停止
させ、上記直流磁界発生用装置の通電とともに上記交流
磁界発生用コイルに通電することにより、上記両サーチ
コイル間の差電圧を測定し、これらの差電圧の測定デー
タに基づいてガドリニアの含有量を算出することを特徴
とする原子炉用燃料棒のガドリニア含有量測定方法。(3) In a method for measuring the gadolinia content of a nuclear reactor fuel rod for measuring the gadolinia content contained in pellets housed in the fuel rod, with the DC magnetic field generating device continuously energized, A fuel rod is passed through this DC magnetic field generating device at a constant speed, and the difference voltage between the reference search coil into which the reference tube is inserted and the measurement search coil into which the fuel rod is inserted is measured, and the DC magnetic field is The fuel rod is stopped inside the generating device and the alternating current magnetic field generating coil, and the voltage difference between the two search coils is reduced by energizing the alternating current magnetic field generating coil as well as energizing the direct current magnetic field generating device. 1. A method for measuring gadolinia content in a nuclear reactor fuel rod, the method comprising measuring the gadolinia content in a nuclear reactor fuel rod and calculating the gadolinia content based on the measurement data of these differential voltages.
JP63214634A 1988-08-29 1988-08-29 Method for measuring gadolinia content in fuel rods for nuclear reactors Expired - Lifetime JPH07122629B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63214634A JPH07122629B2 (en) 1988-08-29 1988-08-29 Method for measuring gadolinia content in fuel rods for nuclear reactors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63214634A JPH07122629B2 (en) 1988-08-29 1988-08-29 Method for measuring gadolinia content in fuel rods for nuclear reactors

Publications (2)

Publication Number Publication Date
JPH0262959A true JPH0262959A (en) 1990-03-02
JPH07122629B2 JPH07122629B2 (en) 1995-12-25

Family

ID=16658990

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JPH07122629B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7094608B2 (en) 2002-04-11 2006-08-22 Korea Atomic Energy Research Institute Method for measuring lanthanide content dissolved in uranium oxide
JP2010271318A (en) * 2009-05-20 2010-12-02 Prueftechnik Dieter Busch Ag Instrument and method for measuring induction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225057A (en) * 1984-04-23 1985-11-09 Nippon Kokan Kk <Nkk> Detection of different material
JPS625173A (en) * 1985-07-01 1987-01-12 Mitsubishi Electric Corp Method and apparatus for mixing amount in paramagnetic substance base

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225057A (en) * 1984-04-23 1985-11-09 Nippon Kokan Kk <Nkk> Detection of different material
JPS625173A (en) * 1985-07-01 1987-01-12 Mitsubishi Electric Corp Method and apparatus for mixing amount in paramagnetic substance base

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7094608B2 (en) 2002-04-11 2006-08-22 Korea Atomic Energy Research Institute Method for measuring lanthanide content dissolved in uranium oxide
JP2010271318A (en) * 2009-05-20 2010-12-02 Prueftechnik Dieter Busch Ag Instrument and method for measuring induction
US9086385B2 (en) 2009-05-20 2015-07-21 Prüftechnik Dieter Busch AG Device and method for inductive measurements

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