JPH07122629B2 - Method for measuring gadolinia content in fuel rods for nuclear reactors - Google Patents
Method for measuring gadolinia content in fuel rods for nuclear reactorsInfo
- Publication number
- JPH07122629B2 JPH07122629B2 JP63214634A JP21463488A JPH07122629B2 JP H07122629 B2 JPH07122629 B2 JP H07122629B2 JP 63214634 A JP63214634 A JP 63214634A JP 21463488 A JP21463488 A JP 21463488A JP H07122629 B2 JPH07122629 B2 JP H07122629B2
- Authority
- JP
- Japan
- Prior art keywords
- gadolinia
- magnetic field
- content
- fuel rod
- measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
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。Description: TECHNICAL FIELD The present invention relates to a gadolinia for a nuclear reactor fuel rod for measuring the content of gadolinia contained in pellets stored in the nuclear reactor fuel rod. Regarding the content measuring method, more specifically, gadolinia (paramagnetic material) existing in a ferromagnetic material
The present invention relates to a gadolinia content measuring method in which the content of is measured using a change in magnetic susceptibility.
従来、この種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ら成る燃
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
磁界に対し一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１対のピックアップコイルを前
記交番磁界中に配置し、前記ピックアップコイルの一方
に前記燃料ペレットを結合し、それから前記燃料ペレッ
トによって前記ピックアップコイル中に誘導された交流
不平衡電圧を測定することにより、前記燃料ペレットの
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差が無視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）。Conventionally, this type of gadolinia content measurement method, uranium dioxide, gadolinia and set a magnetic field constant in time sufficient to saturate the ferromagnetic mixture in the fuel pellets consisting of ferromagnetic mixture, A uniform alternating magnetic field is superposed substantially coaxially on the temporally constant magnetic field,
A pair of oppositely connected pickup coils are arranged in the alternating magnetic field, one of the pickup coils is coupled to the fuel pellet, and then the AC unbalance induced in the pickup coil by the fuel pellet. It is known that by measuring the voltage, the magnetic susceptibility of the fuel pellet is measured based on an induction technique and the measurement error due to the ferromagnetic inclusions is reduced to a negligible level (Japanese Patent Laid-Open No. 2003-242242). (See Japanese Patent Publication No. 53-95494).
しかしながら、上記従来のガドリニア含有量測定方法に
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。However, in the above-mentioned conventional gadolinia content measuring method, since it is necessary to apply a DC magnetic field sufficient to saturate the ferromagnetic material mixed in the fuel pellets, it is necessary to generate a DC magnetic field. There is a problem that a large and powerful permanent magnet or coil must be prepared.
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流磁界と、交流磁界とを組
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
ガドリニア含有量測定方法を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to combine a small DC magnetic field that does not saturate the ferromagnetic material mixed in the pellet and an AC magnetic field, thereby An object of the present invention is to provide a gadolinia content measuring method for a fuel rod for a nuclear reactor, which can eliminate the influence of a ferromagnetic material and can reliably and smoothly measure the content of gadolinia contained in a pellet.
上記目的を達成するために、本発明による原子炉用燃料
棒のガドリニア含有量測定方法は、１個づつの交流磁界
発生用装置及び直流磁界発生用装置の内部のガドリニア
測定位置に燃料棒を停止させ、交流磁界発生用装置の連
続通電中に、直流磁界発生用装置をオン及びオフ状態に
することによって、ペレットが収納されていない基準管
を挿入した基準サーチコイルと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
算出するようにしたことを特徴とするのもである。In order to achieve the above-mentioned object, the method for measuring the gadolinia content of a fuel rod for a reactor according to the present invention comprises stopping the fuel rods at the gadolinia measurement position inside each of the AC magnetic field generating device and the DC magnetic field generating device. By turning on and off the DC magnetic field generator while the AC magnetic field generator is continuously energized, the reference search coil with the reference tube not containing the pellet and the fuel rod inserted for measurement It is also characterized in that the voltage difference with the search coil is measured, and the content of gadolinia in the pellet is calculated based on these measurement data.
又、本発明による原子炉用燃料棒のガドリニア含有量測
定方法は、同心状に配置された１個づつの交流磁界発生
用装置及び直流磁界発生用装置の内部に、ペレットが収
納されていない基準管を挿入した基準サーチコイルと燃
料棒が挿入される測定用サーチコイルとを設け、交流及
び直流磁界発生用装置のいずれか一方を作動させた状態
で、測定用サーチコイル内に燃料棒を一定速度で走行さ
せて、基準サーチコイル及び測定用サーチコイルの差電
圧を測定し、そして、その差電圧が所定電圧と異なる値
を示した場合に燃料棒を停止させ、オフ状態にある他方
の磁界発生用装置を作動させて、差電圧を測定し、更に
直流磁界発生用装置をオフ状態にして、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ようにしたことを特徴とするも
のである。In addition, the method for measuring the gadolinia content of a nuclear reactor fuel rod according to the present invention is a standard in which pellets are not housed inside one AC magnetic field generator and one DC magnetic field generator that are concentrically arranged. A reference search coil with a tube inserted and a measurement search coil into which a fuel rod is inserted are provided, and the fuel rod is fixed in the measurement search coil with either the AC or DC magnetic field generator activated. The vehicle is run at a speed to measure the differential voltage between the reference search coil and the measurement search coil, and when the differential voltage shows a value different from the predetermined voltage, the fuel rod is stopped and the other magnetic field in the off state is Operate the generator to measure the differential voltage, turn off the DC magnetic field generator to measure the differential voltage, and calculate the gadolinia content in the pellet based on these measurement data. It is characterized in that it has a so that.
［作用］ 本発明の原子炉用燃料棒のガドリニア含有量測定方法に
あっては、交流磁界発生用装置を通電状態にし、直流磁
界発生用装置をオン及びオフ状態にして、基準サーチコ
イルと測定用サーチコイルとの差電圧をそれぞれ測定す
るが、その際、基準サーチコイルには基準管のみが挿入
されているから、測定される各差電圧には燃料棒の非測
定対象である被覆管の影響が除去され、ペレットのみの
差電圧を得ることができることになり、被覆管のノイズ
を除去できて、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でき
る。[Operation] In the gadolinia content measuring method for a nuclear reactor fuel rod according to the present invention, the AC magnetic field generator is energized, the DC magnetic field generator is turned ON and OFF, and the reference search coil and the measurement are performed. The differential voltage with the search coil for each is measured.At that time, since only the reference tube is inserted in the reference search coil, the measured differential voltage is different from that of the non-measurement target of the fuel rod. The influence is removed and the differential voltage of only the pellet can be obtained, the noise of the cladding tube can be removed, and the influence of the ferromagnetic substance is eliminated based on the measured data of the differential voltage to calculate the gadolinia content. it can.
又、本発明の原子炉用燃料棒のガドリニア含有量測定方
法にあっては、燃料棒を走行させつつペレットの差電圧
を測定し、差電圧が所定電圧と異なる値を示した場合に
燃料棒を停止させて、そのペレットに関して上述の方法
を用いて精密に測定することで、燃料棒中に含まれる多
数のペレットのガドリニア含有量を効率的に且つ精密に
測定できる。Further, in the gadolinia content measuring method for a nuclear reactor fuel rod of the present invention, the differential voltage of the pellet is measured while the fuel rod is running, and when the differential voltage shows a value different from the predetermined voltage, the fuel rod is Is stopped and the pellets are precisely measured using the method described above, whereby the gadolinia content of a large number of pellets contained in the fuel rod can be efficiently and precisely measured.
以下、第１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。An embodiment of the present invention will be described below with reference to FIGS.
第１図は本発明のガドリニア含有量測定方法を実施する
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１は直流磁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、中空棒状の被覆管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9,10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11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。FIG. 1 is a schematic configuration diagram showing an example of an apparatus for carrying out the gadolinia content measuring method of the present invention. In the figure, reference numeral 1 is a DC magnetic field generating coil, and an AC magnetic field generating coil 2 is concentrically arranged inside the DC magnetic field generating coil 1. A pair of reference search coils 3 and a measurement search coil 4 are arranged side by side inside the AC magnetic field generating coil 2. The fuel rod 5 to be measured is inserted through the measurement search coil 4. The fuel rod 5 includes a hollow rod-shaped cladding tube 6,
It mainly comprises a plurality of pellets 7 filled therein, a coil spring 8 for pressing the pellets 7, and a pair of end plugs 9 and 10 for sealing both ends of the covering tube 6. Further, a reference tube 11 having the same structure and the same material as the coating tube 6 is inserted through the reference search coil 3. Then, the voltages induced in the search coils 3 and 4 are extracted as search coil difference voltages Va and 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に通電して直流磁界を重畳した場合
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 apparatus configured as described above, in FIG. 1, the AC magnetic field generating coil 2 is continuously energized to apply an AC magnetic field, and at the same time, the DC magnetic field generating coil is used. 1 is energized to superimpose a DC magnetic field and no DC magnetic field is applied.
The voltage difference between the measurement search coil 4 and the reference search coil 3 is measured.
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 differential voltage Va between the measurement search coil 4 and the reference search coil 3 when the AC magnetic field and the DC magnetic field are superimposed is given by the following equation.
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、Sn1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、Si
1は強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である。 However, in the above equation, Mna is the strength of the magnetization due to the superposition magnetic field of the alternating magnetic field and the direct current magnetic field of the paramagnetic material contained in the pellet 7, and Mia is the superposition magnetic field of the ferromagnetic material contained in the pellet 7. The strength of magnetization, Sn1 is the equivalent cross-sectional area for the magnetic flux that links the search coil due to the magnetization of the paramagnetic material, Si
1 is the equivalent cross section for the magnetic flux that links 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Vbも同様に表され
る。すなわち、 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。Further, the differential voltage Vb between the measurement search coil 4 and the reference search coil 3 when only the AC magnetic field is applied is also represented in the same manner. That is, Here, Mnb is the strength of magnetization of the paramagnetic material contained in the pellet 7 due to the alternating magnetic field, and Mib is the strength of magnetization of the ferromagnetic material contained in the pellet 7 due to the alternating magnetic field.
そして、ガドリニア等の常磁性体の磁化の強さは、直流
磁界の強さが小さい範囲でそ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。すなわち、 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V0は、下式で表され
る。Since the strength of magnetization of a paramagnetic material such as gadolinia is not affected by the strength of the DC magnetic field, the difference voltage Vab between va and Vb corresponds to the content of the ferromagnetic material. That is, Since this difference voltage Vab corresponds to the second term of the above formula (1), the paramagnetic substance content, that is,
The voltage V 0 that can be converted into the gadolinia content is represented by the following formula.
V0＝−K1・Va−K2・Vab＋Ｃ ……（４） ただし、K1,K2及びＣは実験によって求められる定数で
ある。V 0 = −K1 · Va−K2 · Vab + C (4) where K1, K2 and C are constants obtained by experiments.
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に強磁性体が含有さ
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、磁化率の変化が小さくなり、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 specific experiments based on the method of the present invention will be described. First, the relationship between the search coil differential voltage Va and the DC magnetic field when the pellet 7 contains a ferromagnetic substance is as follows. The characteristics are shown in the figure. here,
The gadolinia content was 6%. In this figure, the greater the ferromagnetic content, the greater the difference voltage Va, and
It can be seen that the more the DC magnetic field is applied, the smaller the change in magnetic susceptibility, and thus the smaller the difference 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％、強磁性体含有量100p
pm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,Vabを計測すると、Va＝1.69V,Vab＝0.09Vを得
た。従って、これらのVa,Vabの値により、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。Further, the relationship between Va and Vab in the above formula (4) was found by experiment, and its characteristic straight line is shown in FIG. Based on this figure, for example, gadolinia (Gd) content 8%, ferromagnetic material content 100p
When Va and Vab were measured by the measuring device shown in FIG. 1 using the pellet 7 of pm, Va = 1.69V and Vab = 0.09V were obtained. Therefore, from these values of Va and Vab, the gadolinia content was estimated to be 7.9% by using FIG. 3, which is in agreement with the substantially actual value of 8%, thus 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
性体の量が他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１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 order to determine which part of the fuel rod 5 is to be measured prior to calculating the gadolinia amount contained in the pellet 7 in the fuel rod 5 based on the above-described embodiment, the DC magnetic field generating coil is used. Alternatively, with only one of the AC magnetic field generating coils being constantly energized, the fuel rod to be measured is passed through the coil at a constant speed. At this time, when the amount of ferromagnetic material or paramagnetic material contained in a certain pellet in the fuel rod is different from that of other pellets, the search coil differential voltage generates different voltages in the pellet portion, This portion (abnormal voltage generation location) may be stopped at the measurement position of the measuring device shown in FIG. 1 to measure the gadolinia amount.
又、上記実施例においては、直流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。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。Further, in the above-described embodiment, the coil is used for generating the DC magnetic field, but the same applies when the magnet is used. Then, it is also possible to control the on / off of the DC magnetic field at the place where the DC magnetic field is applied by moving the magnet.
以上説明したように、本発明による原子炉用燃料棒のガ
ドリニア含有量測定方法は、交流磁界発生用装置及び直
流磁界発生用装置のガドリニア測定位置に燃料棒を停止
させ、交流磁界発生用装置の連続通電中に、直流磁界発
生用装置をオン及びオフ状態にすることによって、ペレ
ットが収納されていない基準管を挿入した基準サーチコ
イルと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、これらの測定データからペレット中
のガドリニアの含有量を算出するようにしたから、燃料
棒の被覆管の影響（ノイズ）や強磁性体による影響を排
除して、より精密にペレット中のガドリニア含有量を算
出することができる。しかも、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、磁界発生用コイルが小
型のものでよく、かつ測定データからガドリニア含有量
を算出する処理が一次式による演算等の簡単な処理でよ
いという効果もある。As described above, the gadolinia content measuring method for a reactor fuel rod according to the present invention, the fuel rod is stopped at the gadolinia measurement position of the AC magnetic field generation device and the DC magnetic field generation device, and the AC magnetic field generation device By turning on and off the DC magnetic field generator during continuous energization, the difference voltage between the reference search coil with the reference tube not containing the pellet and the measurement search coil with the fuel rod inserted is measured. Since the content of gadolinia in the pellet was calculated from these measured data, the influence of the cladding of the fuel rod (noise) and the influence of the ferromagnetic material were eliminated, and the content of the pellet in the pellet was measured more accurately. The gadolinia content can be calculated. Moreover, the content of gadolinia contained in the pellet can be measured reliably and smoothly by using a DC magnetic field small enough not to saturate the ferromagnetic material mixed in the pellet, and the magnetic field generation coil There is also an effect that the size may be small, and the process of calculating the gadolinia content from the measurement data may be a simple process such as a calculation using a linear equation.
又、本発明による原子炉用燃料棒のガドリニア含有量測
定方法は、交流磁界発生用装置及び直流磁界発生用装置
の内部に、ペレットが収納されていない基準管を挿入し
た基準サーチコイルと燃料棒が挿入される測定用サーチ
コイルとを設け、交流及び直流磁界発生用装置の一方を
作動させた状態で、測定用サーチコイル内に燃料棒を一
定速度で走行させて、基準サーチコイル及び測定用サー
チコイルの差電圧を測定し、そして、その差電圧が所定
電圧と異なる値を示した場合に燃料棒を停止させ、オフ
状態にある他方の磁界発生用装置を作動させて、差電圧
を測定し、更に直流磁界発生用装置をオフ状態にして、
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ようにしたから、
上述の作用効果に加えて、燃料棒中に含まれる多数のペ
レットのガドリニア含有量を走行状態で簡便且つ迅速に
測定でき、しかも差電圧が所定電圧と異なる場合には燃
料棒をその都度停止させて精密に測定できることにな
り、効率的であるという効果がある。Further, the gadolinia content measuring method for a fuel rod for a nuclear reactor according to the present invention includes a reference search coil and a fuel rod in which a reference tube containing no pellets is inserted inside the AC magnetic field generator and the DC magnetic field generator. With a measurement search coil in which is inserted, and one of the AC and DC magnetic field generators is activated, the fuel rod is run at a constant speed in the measurement search coil, and the reference search coil and measurement The differential voltage of the search coil is measured, and when the differential voltage shows a value different from the predetermined voltage, the fuel rod is stopped and the other magnetic field generating device in the off state is activated to measure the differential voltage. And then turn off the DC magnetic field generator,
Since the differential voltage was measured and the content of gadolinia in the pellet was calculated based on these measurement data,
In addition to the above-mentioned effects, the gadolinia content of a large number of pellets contained in the fuel rod can be easily and quickly measured in the running state, and the fuel rod is stopped each time when the differential voltage is different from the predetermined voltage. Therefore, it is possible to perform precise measurement, which is effective.
第１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……交流磁界発生用コイル、 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、 11……基準管。FIG. 1 is a schematic configuration diagram showing an example of a measuring apparatus for carrying out the method of the present invention, FIGS. 2 and 3 show characteristics of one embodiment of the present invention, and FIG. 2 is a search coil. FIG. 3 is a characteristic diagram showing the relationship between the differential voltage and the DC magnetic field, and FIG. 3 is a characteristic diagram showing the measurement of gadolinia content by the search coil differential voltage characteristic. 1 ... DC magnetic field generation coil, 2 ... AC magnetic field generation coil, 3 ... Reference search coil, 4 ... Measurement search coil, 5 ... Fuel rod, 7 ... Pellet, 11 ... Reference tube.
Claims (2)
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個づつの交流磁界発生用装置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装置の連続通電中に、上記直流磁界
発生用装置をオン及びオフ状態にすることによって、ペ
レットが収納されていない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、これらの測定データに基づい
て上記ペレット中のガドリニアの含有量を算出するよう
にした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. A method for measuring gadolinia content in a fuel rod for a nuclear reactor for measuring the content of gadolinia contained in pellets contained in a fuel rod, comprising: Stop the fuel rod at the gadolinia measurement position inside the DC magnetic field generator,
Measurement by inserting the reference tube containing no reference tube containing the pellets and the fuel rod by turning on and off the device for generating the DC magnetic field while the device for generating the AC magnetic field is continuously energized. A gadolinia content measuring method for a nuclear reactor fuel rod is characterized in that the gadolinia content in the pellets is calculated based on the measured data of the voltage difference between the gadolinia content and the search coil.
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、 同心状に配置された１個づつの交流磁界発生用装置及び
直流磁界発生用装置の内部に、ペレットが収納されてい
ない基準管を挿入した基準サーチコイルと上記燃料棒が
挿入される測定用サーチコイルとを設け、 上記交流及び直流磁界発生用装置のいずれか一方を作動
させた状態で、上記測定用サーチコイル内に燃料棒を一
定速度で走行させて、上記基準サーチコイル及び測定用
サーチコイルの差電圧を測定し、そして、 その差電圧が所定電圧と異なる値を示した場合に上記燃
料棒を停止させ、オフ状態にある他方の上記磁界発生用
装置を作動させて、前記差電圧を測定し、更に上記直流
磁界発生用装置をオフ状態にして、上記差電圧を測定
し、これらの測定データに基づいて上記ペレット中のガ
ドリニアの含有量を算出するようにしたことを特徴とす
る原子炉用燃料棒のガドリニア含有量測定方法。2. A method for measuring gadolinia content of a reactor fuel rod for measuring the content of gadolinia contained in pellets contained in a fuel rod, wherein each gadolinia content is measured in a concentric manner. Inside the AC magnetic field generating device and the DC magnetic field generating device, there are provided a reference search coil in which a reference tube containing no pellets is inserted and a measurement search coil in which the fuel rod is inserted. While operating either one of the generators, the fuel rod is run in the measurement search coil at a constant speed to measure the differential voltage between the reference search coil and the measurement search coil, and When the differential voltage shows a value different from the predetermined voltage, the fuel rod is stopped, the other magnetic field generating device in the off state is operated, the differential voltage is measured, and the direct current is further applied. The field generator is turned off, the differential voltage is measured, and the content of gadolinia in the pellets is calculated based on these measurement data. Content measurement method.
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 JPH0262959A (en) | 1990-03-02 |
| JPH07122629B2 true JPH07122629B2 (en) | 1995-12-25 |
Family
ID=16658990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63214634A Expired - Lifetime JPH07122629B2 (en) | 1988-08-29 | 1988-08-29 | Method for measuring gadolinia content in fuel rods for nuclear reactors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122629B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100473645B1 (en) | 2002-04-11 | 2005-03-08 | 한국수력원자력 주식회사 | Method for measuring lanthanides content dissolved in uranium oxide |
| DE102009022138A1 (en) * | 2009-05-20 | 2010-11-25 | Prüftechnik Dieter Busch AG | Apparatus and method for inductive measurements |
Family Cites Families (2)
| 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 |
-
1988
- 1988-08-29 JP JP63214634A patent/JPH07122629B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0262959A (en) | 1990-03-02 |
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