JPH04259888A - Neutron flux measurement device - Google Patents
Neutron flux measurement deviceInfo
- Publication number
- JPH04259888A JPH04259888A JP2116291A JP2116291A JPH04259888A JP H04259888 A JPH04259888 A JP H04259888A JP 2116291 A JP2116291 A JP 2116291A JP 2116291 A JP2116291 A JP 2116291A JP H04259888 A JPH04259888 A JP H04259888A
- Authority
- JP
- Japan
- Prior art keywords
- neutron
- selection circuit
- neutron flux
- signal selection
- signal
- 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
Links
- 230000004907 flux Effects 0.000 title claims abstract description 31
- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、原子力発電プラント等
において、定格出力運転状態での原子炉内中性子束を監
視／計測するのに用いられる中性子束計測装置に関する
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a neutron flux measuring device used in a nuclear power plant or the like to monitor/measure the neutron flux within a nuclear reactor under rated power operating conditions.
【０００２】0002
【従来の技術】従来の出力領域中性子束計測は、原子炉
内に設置した中性子検出器に高電圧を印加しておき、こ
の中性子検出器に入射する中性子束強度に比例して出力
される電流信号を検出して、この検出データをマイクロ
プロセッサ等の演算装置に取込んで監視していた。また
、そのマイクロプロセッサ等によって計測装置の動作制
御も行われていた。図２に従来よりある中性子束計測装
置の構成例を示す。[Prior Art] Conventional power range neutron flux measurement involves applying a high voltage to a neutron detector installed in a nuclear reactor, and then outputting a current proportional to the intensity of the neutron flux incident on the neutron detector. The signal was detected and the detected data was input into a computing device such as a microprocessor for monitoring. In addition, the microprocessor or the like also controlled the operation of the measuring device. FIG. 2 shows an example of the configuration of a conventional neutron flux measuring device.
【０００３】この中性子束計測装置は、原子炉内に設置
された多数の中性子検出器１−１〜１−ｎに演算増幅器
２−１〜２−ｎがそれぞれ接続され、その各出力側がそ
れぞれ絶縁アンプ３−１〜３−ｎを介して信号選択回路
４に接続されている。この信号選択回路３はＡ／Ｄ変換
器５を介して演算装置６に接続される。この演算装置６
は中性子束の監視と共に信号切換回路４の切換えも行う
。[0003] In this neutron flux measurement device, operational amplifiers 2-1 to 2-n are connected to a large number of neutron detectors 1-1 to 1-n installed in a nuclear reactor, and each output side is insulated. It is connected to the signal selection circuit 4 via amplifiers 3-1 to 3-n. This signal selection circuit 3 is connected to an arithmetic unit 6 via an A/D converter 5. This computing device 6
not only monitors the neutron flux but also switches the signal switching circuit 4.
【０００４】以上のように構成された中性子束計測装置
においては、中性子検出器１および演算増幅器２に高電
圧電源７から高電圧が印加され、中性子検出器１から出
力された検出電流が演算増幅器２および抵抗器８によっ
て電圧信号に変換される。この電圧信号は絶縁アンプ３
を介してそれぞれ演算装置側へ送られる。In the neutron flux measuring device configured as described above, a high voltage is applied to the neutron detector 1 and the operational amplifier 2 from the high voltage power supply 7, and the detection current output from the neutron detector 1 is applied to the operational amplifier 2. 2 and resistor 8 into a voltage signal. This voltage signal is the isolation amplifier 3
are respectively sent to the arithmetic device side via the .
【０００５】上述した中性子束計測装置は、中性子検出
器１および演算増幅器２は、高電圧電源４（通常、直流
１００Ｖ以上）を基準にして動作し、Ａ／Ｄ変換器５、
演算装置６は接地電位を基準として動作する。そのため
、信号選択回路４に接続された測定チャンネル毎に絶縁
アンプ３−１〜３−ｎを設ける必要があった。しかし、
絶縁アンプは他の電子回路に比べて大型かつ高価格であ
り、装置が大型化すると共にコストアップにもなるとい
った不具合があった。[0005] In the above-described neutron flux measuring device, the neutron detector 1 and the operational amplifier 2 operate based on a high voltage power supply 4 (usually 100 V DC or higher), and the A/D converter 5,
The arithmetic unit 6 operates with the ground potential as a reference. Therefore, it was necessary to provide isolation amplifiers 3-1 to 3-n for each measurement channel connected to the signal selection circuit 4. but,
Isolated amplifiers are larger and more expensive than other electronic circuits, and have the disadvantage of increasing the size of the device and increasing costs.
【０００６】そこで、この様な不具合を解消するために
、中性子束計測装置を図３に示すように構成し、多数の
中性子検出器１−１〜１−ｎの出力を高電圧電源７で動
作する信号選択回路１０で直接スイッチングして、後段
の信号処理ラインを一線にし、最小個数となる一つの演
算増幅器２、絶縁アンプ３を介して演算装置側と接続を
行い、コストアップ、大型化の原因となる絶縁アンプの
削減を図っている。なお、この構成では、信号選択回路
１０は高圧側となるため、フォトカプラ等からなる絶縁
回路１１を介して演算装置６に接続される。In order to solve this problem, the neutron flux measuring device is configured as shown in FIG. Direct switching is performed by the signal selection circuit 10 to connect the subsequent signal processing line, and connection is made to the arithmetic device side through one operational amplifier 2 and isolation amplifier 3, which is the minimum number, thereby reducing cost and size. We are trying to reduce the number of isolation amplifiers that cause this. In this configuration, since the signal selection circuit 10 is on the high voltage side, it is connected to the arithmetic unit 6 via an insulating circuit 11 made of a photocoupler or the like.
【０００７】ところで、上述した中性子束計測装置は、
中性子検出器１−１〜１−ｎと信号選択回路１０とがケ
ーブルＬによってそれぞれ接続されている。これらのケ
ーブルＬはそれぞれケーブル容量Ｃを持っており、この
ケーブル容量ＣはケーブルＬの長さによって異なる。中
性子検出器１−１〜１−ｎは原子炉内の各所に分散配置
されるため、各々のケーブル容量Ｃも異なっている。By the way, the above-mentioned neutron flux measuring device is
The neutron detectors 1-1 to 1-n and the signal selection circuit 10 are connected by cables L, respectively. Each of these cables L has a cable capacity C, and this cable capacity C varies depending on the length of the cable L. Since the neutron detectors 1-1 to 1-n are distributed at various locations within the reactor, the cable capacities C of each are also different.
【０００８】一方、図３に示した中性子束計測装置は、
各ケーブルＬのケーブル容量Ｃを信号選択回路１０で直
接スイッチングするため、ケーブル容量Ｃの放電により
スイッチング時間が遅れたり、各信号ライン間でケーブ
ル容量Ｃの違いによりスイッチング時間にバラツキが生
じる。On the other hand, the neutron flux measurement device shown in FIG.
Since the cable capacitance C of each cable L is directly switched by the signal selection circuit 10, the switching time is delayed due to discharge of the cable capacitance C, and the switching time varies due to the difference in the cable capacitance C between each signal line.
【０００９】[0009]
【発明が解決しようとする課題】従って、従来の中性子
束計測装置は、装置の小型化および低価格化が難しく、
またケーブル容量による信号選択回路でのスイッチング
時間の遅れや、スイッチング時間のバラツキにより高速
、高精度な計測が阻害される可能性があった。[Problems to be Solved by the Invention] Therefore, with conventional neutron flux measuring devices, it is difficult to downsize and reduce the cost of the device.
In addition, high-speed, high-precision measurement may be hindered due to delay in switching time in the signal selection circuit due to cable capacitance and variations in switching time.
【００１０】本発明は以上のような実情に鑑みてなされ
たもので、中性子計測の高速、高精度化を実現できると
共に、小型でしかも安価な中性子束計測装置を提供する
ことを目的とする。The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a compact and inexpensive neutron flux measuring device that can realize high-speed and high-precision neutron measurement.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る中性子束計測装置は、計測領域内の各
所に設置され入射する中性子束強度に比例した検出電流
を出力する複数の中性子検出器と、これら複数の中性子
検出器からの各検出電流をそれぞれ電圧信号に変換する
複数の演算増幅器と、これら複数の演算増幅器で変換さ
れた電圧信号を選択的に取込む信号選択回路と、この信
号選択回路と絶縁手段を介して接続され該信号選択回路
を介して取込まれた電圧信号をＡ／Ｄ変換するＡ／Ｄ変
換器と、このＡ／Ｄ変換器出力を取込んで所定の演算処
理を行う演算手段とを具備してなるものとした。[Means for Solving the Problems] In order to achieve the above object, the neutron flux measuring device according to the present invention includes a plurality of neutron flux measuring devices installed at various locations within a measurement region and outputting a detection current proportional to the intensity of incident neutron flux. A neutron detector, a plurality of operational amplifiers that convert each detected current from the plurality of neutron detectors into voltage signals, and a signal selection circuit that selectively takes in the voltage signals converted by the plurality of operational amplifiers. , an A/D converter that is connected to this signal selection circuit via an insulating means and that converts the voltage signal taken in through the signal selection circuit into A/D, and an A/D converter that takes in the output of this A/D converter. The computer is also equipped with a calculation means for performing predetermined calculation processing.
【００１２】0012
【作用】本発明によれば、複数の中性子検出器からの検
出電流がそれぞれ演算増幅器で電圧信号に変換された後
に信号選択回路でスイッチングされ、選択された一つの
電圧信号が絶縁手段を介してＡ／Ｄ変換器へ送られる。
従って、信号選択回路は複数の中性子検出器の電流信号
を直接スイッチングしないため、信号選択回路における
各信号ライン間のスイッチング時間のバラツキの発生を
防止でき、しかも信号選択回路で選択された一つの電圧
信号のみが絶縁手段を介してＡ／Ｄ変換器へ送られるの
で、絶縁手段は一系統のみで構成することができる。[Operation] According to the present invention, detected currents from a plurality of neutron detectors are converted into voltage signals by operational amplifiers, and then switched by a signal selection circuit, and one selected voltage signal is transmitted through an insulating means. Sent to A/D converter. Therefore, since the signal selection circuit does not directly switch the current signals of multiple neutron detectors, it is possible to prevent variations in switching time between each signal line in the signal selection circuit, and moreover, the signal selection circuit does not directly switch the current signals of multiple neutron detectors. Since only the signal is sent to the A/D converter via the isolation means, only one system of isolation means can be used.
【００１３】[0013]
【実施例】以下、本発明の一実施例を図１を参照しなが
ら説明する。Embodiment An embodiment of the present invention will be described below with reference to FIG.
【００１４】本実施例は、複数の中性子検出器１−１〜
１−ｎが、それぞれ対応する複数の演算増幅器２−１〜
２−ｎにそれぞれ接続され、これら演算増幅器２−１〜
２−ｎの出力側に信号選択回路２０が接続されている。
この信号選択回路２０の出力端子は、絶縁手段となる一
つの絶縁アンプ３を介してＡ／Ｄ変換器５に接続され、
さらにこのＡ／Ｄ変換器５が演算装置６に接続されてい
る。この演算装置６は、中性子束計測データを演算処理
して中性子束監視を行うと共に、フォトカプラ１１を介
して信号選択回路２０に接続され、信号選択回路２０に
切換制御信号を送信するように構成されている。次に、
以上のように構成された本実施例の動作について説明す
る。In this embodiment, a plurality of neutron detectors 1-1 to
1-n respectively correspond to a plurality of operational amplifiers 2-1 to 2-n.
2-n, and these operational amplifiers 2-1 to 2-n are respectively connected to
A signal selection circuit 20 is connected to the output side of 2-n. The output terminal of this signal selection circuit 20 is connected to the A/D converter 5 via one insulation amplifier 3 serving as insulation means,
Further, this A/D converter 5 is connected to an arithmetic unit 6. This arithmetic device 6 performs arithmetic processing on neutron flux measurement data to monitor neutron flux, and is connected to a signal selection circuit 20 via a photocoupler 11 and configured to transmit a switching control signal to the signal selection circuit 20. has been done. next,
The operation of this embodiment configured as above will be explained.
【００１５】中性子検出器１−１に中性子が入射すると
、入射した中性子束強度に比例した検出電流が対応する
演算増幅器２−１の（−）側入力端子に流れ、演算増幅
器２−１の出力に、検出電流と抵抗器８の抵抗値との積
が電圧となって現れる。同様に、他の演算増幅器２−２
〜２−ｎの出力にも、対応する中性子検出器１−２〜１
−ｎで検出された検出電流が電圧信号に変換されて現れ
る。When a neutron is incident on the neutron detector 1-1, a detection current proportional to the intensity of the incident neutron flux flows to the (-) side input terminal of the corresponding operational amplifier 2-1, and the output of the operational amplifier 2-1 is The product of the detected current and the resistance value of the resistor 8 appears as a voltage. Similarly, other operational amplifier 2-2
~2-n output also corresponds to the corresponding neutron detector 1-2~1
The detected current detected at -n is converted into a voltage signal and appears.
【００１６】例えば、中性子検出器１側に１ｍＡの検出
電流が流れ、抵抗器８の抵抗値が１ＫΩの場合には、演
算増幅器２の出力は仮想マイナス１Ｖとなり、高電圧電
源７による基準動作電圧が１００Ｖであれば、９９Ｖの
電圧が現れる。For example, when a detection current of 1 mA flows to the neutron detector 1 side and the resistance value of the resistor 8 is 1 KΩ, the output of the operational amplifier 2 becomes a virtual minus 1 V, and the reference operating voltage from the high voltage power supply 7 If is 100V, a voltage of 99V will appear.
【００１７】これら演算増幅器２−１〜２−ｎの出力に
現れた電圧信号は、演算装置６からの切換制御信号を受
けた信号選択回路２０によって順次スイッチングされて
、絶縁アンプ３に入力する。この絶縁アンプ３の出力は
接地電位を基準としているためマイナス１Ｖが現れ、こ
の電圧信号がＡ／Ｄ変換器５でデジタル信号に変換され
た後、このデジタル値が入射中性子束強度として演算装
置６に取込まれる。The voltage signals appearing at the outputs of these operational amplifiers 2-1 to 2-n are sequentially switched by the signal selection circuit 20 which receives a switching control signal from the arithmetic unit 6, and are inputted to the isolation amplifier 3. Since the output of this isolation amplifier 3 is based on the ground potential, -1V appears, and after this voltage signal is converted into a digital signal by the A/D converter 5, this digital value is used as the incident neutron flux intensity in the arithmetic unit 6. be taken into account.
【００１８】演算装置６は、フォトカプラ１１を介して
信号選択回路２０に切換制御信号を出力して、演算増幅
器２出力を順次スイッチングして、他の計測チャンネル
の計測データを取込むと共に、これら計測データに基づ
く監視を行う。The arithmetic device 6 outputs a switching control signal to the signal selection circuit 20 via the photocoupler 11 to sequentially switch the outputs of the operational amplifier 2 to take in the measurement data of other measurement channels, and also Perform monitoring based on measurement data.
【００１９】この様に本実施例によれば、各中性子検出
器１−１〜１−ｎへの入射中性子束強度に応じた検出電
流を各々対応する演算増幅器２−１〜２−ｎで電圧信号
に変換し、これら電圧信号を信号選択回路２０でスイッ
チングして一つの絶縁アンプ３を介して演算装置側へ取
込むようにしたので、従来のようにケーブル容量を直接
スイッチングせずに、これを電圧値に変換した電圧信号
をスイッチングしているため、スイッチングに要する時
間が極めて短縮化され、しかもスイッチング時間のバラ
ツキも発生しないことから、中性子計測の高速化および
高精度かを図ることができる。As described above, according to this embodiment, the detection current corresponding to the intensity of the incident neutron flux to each of the neutron detectors 1-1 to 1-n is converted into a voltage by the corresponding operational amplifier 2-1 to 2-n. These voltage signals are converted into signals, switched by the signal selection circuit 20, and taken into the arithmetic unit side via a single isolation amplifier 3. Since switching is performed using a voltage signal converted into a voltage value, the time required for switching is extremely shortened, and there is no variation in switching time, making it possible to achieve faster and more accurate neutron measurements. .
【００２０】また、中性子計測データを取込むのに使う
絶縁アンプ３は一つでよいことから、従来のように各測
定チャネル毎に絶縁アンプを設ける場合に比べて、絶縁
アンプを大幅に削減できて装置の小型化を図れると共に
コストダウンを図ることもできる。[0020] Furthermore, since only one isolation amplifier 3 is needed to take in the neutron measurement data, the number of isolation amplifiers can be significantly reduced compared to the conventional case where an isolation amplifier is provided for each measurement channel. This makes it possible to reduce the size of the device and reduce costs.
【００２１】[0021]
【発明の効果】以上詳記したように本発明によれば、中
性子計測の高速、高精度化を実現できると共に、小型で
しかも安価な中性子束計測装置を提供できる。As described in detail above, according to the present invention, it is possible to realize high-speed and high-precision neutron measurement, and to provide a compact and inexpensive neutron flux measuring device.
【図１】本発明の一実施例に係る中性子束計測装置の構
成図。FIG. 1 is a configuration diagram of a neutron flux measurement device according to an embodiment of the present invention.
【図２】従来の中性子束計測装置の構成図。FIG. 2 is a configuration diagram of a conventional neutron flux measurement device.
【図３】従来の他の中性子束計測装置の構成図。FIG. 3 is a configuration diagram of another conventional neutron flux measurement device.
１…中性子検出器、２…演算増幅器、３…絶縁アンプ、
５…Ａ／Ｄ変換器、６…演算装置、７…高電圧電源、８
…抵抗器、１１…フォトカプラ、２０…信号選択回路。1... Neutron detector, 2... Operational amplifier, 3... Isolation amplifier,
5... A/D converter, 6... Arithmetic device, 7... High voltage power supply, 8
...Resistor, 11...Photocoupler, 20...Signal selection circuit.
Claims (1)
子束強度に比例した検出電流を出力する複数の中性子検
出器と、これら複数の中性子検出器からの各検出電流を
それぞれ電圧信号に変換する複数の演算増幅器と、これ
ら複数の演算増幅器で変換された電圧信号を選択的に取
込む信号選択回路と、この信号選択回路に絶縁手段を介
して接続され該信号選択回路を介して取込まれた電圧信
号をＡ／Ｄ変換するＡ／Ｄ変換器と、このＡ／Ｄ変換器
出力を取込んで所定の演算処理を行う演算手段とを具備
したことを特徴とする中性子束計測装置。Claim 1: A plurality of neutron detectors that are installed at various locations within a measurement area and output a detection current proportional to the intensity of incident neutron flux, and each detection current from the plurality of neutron detectors is converted into a voltage signal. a signal selection circuit that selectively takes in the voltage signals converted by the plurality of operational amplifiers; What is claimed is: 1. A neutron flux measuring device comprising: an A/D converter that A/D converts an input voltage signal; and a calculation means that takes in the output of the A/D converter and performs predetermined calculation processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2116291A JP3073536B2 (en) | 1991-02-14 | 1991-02-14 | Neutron flux measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2116291A JP3073536B2 (en) | 1991-02-14 | 1991-02-14 | Neutron flux measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04259888A true JPH04259888A (en) | 1992-09-16 |
| JP3073536B2 JP3073536B2 (en) | 2000-08-07 |
Family
ID=12047221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2116291A Expired - Fee Related JP3073536B2 (en) | 1991-02-14 | 1991-02-14 | Neutron flux measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3073536B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7800439B2 (en) * | 2006-10-27 | 2010-09-21 | Ut-Battelle, Llc | High speed preamplifier circuit, detection electronics, and radiation detection systems therefrom |
| KR101814092B1 (en) * | 2016-04-28 | 2018-01-30 | 한국천문연구원 | Wide sensitivity-range tissue equivalent proportional counter apparatus and detecting method thereof |
-
1991
- 1991-02-14 JP JP2116291A patent/JP3073536B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3073536B2 (en) | 2000-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100550554C (en) | Three utmost points or four pole low-voltage power switch with rogowski coil | |
| JP2653522B2 (en) | Reactor neutron flux monitoring device | |
| AU695365B2 (en) | Electrical apparatus with wide dynamic range for monitoring and protecting electric power systems | |
| JPH04259888A (en) | Neutron flux measurement device | |
| JP2931631B2 (en) | Neutron flux measurement system | |
| US6584365B1 (en) | Electronic trip device with offset correction means | |
| JPS586078Y2 (en) | Electricity derivation device | |
| JPS60162967A (en) | Fault point spotting device of direct current power transmission system | |
| JPH04359399A (en) | Three-wire signal processor | |
| JP4103789B2 (en) | Protection control device | |
| JPS62194482A (en) | Apparatus for measuring radiation | |
| JPS625665Y2 (en) | ||
| JPH0367228B2 (en) | ||
| JPS58129267A (en) | Monitoring device for standing wave ratio | |
| JPH01193653A (en) | Power source apparatus for measuring machine | |
| JP2616196B2 (en) | Control device abnormality detection circuit | |
| JPH0215198Y2 (en) | ||
| SU919105A2 (en) | Device for remote monitoring of distant power supply of unattended amplifying stations | |
| JPH03269287A (en) | Monitor of neutron in output area of nuclear reactor | |
| RU2084017C1 (en) | Device for information input | |
| SU951179A1 (en) | Device for selective checking of electrical system insulation resistance | |
| Macdonald et al. | Microcomputer-controlled measurement system for IREQ's power system simulator | |
| JPS61295819A (en) | Input system for protective relay | |
| JPS61112225A (en) | Process input device | |
| JPS61295820A (en) | Input system for protective relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |