JPH02145995A - Position detector of fuel rod - Google Patents
Position detector of fuel rodInfo
- Publication number
- JPH02145995A JPH02145995A JP63299122A JP29912288A JPH02145995A JP H02145995 A JPH02145995 A JP H02145995A JP 63299122 A JP63299122 A JP 63299122A JP 29912288 A JP29912288 A JP 29912288A JP H02145995 A JPH02145995 A JP H02145995A
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- signal
- dropping
- position detection
- wave
- 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
- 239000000446 fuel Substances 0.000 title 1
- 238000001514 detection method Methods 0.000 claims description 48
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はＰＷＲ型原子炉の制御棒位置検出装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control rod position detection device for a PWR nuclear reactor.
第３図は従来の制御棒位置検出装置を示すブロック図で
ある０図において、（１）は制御棒の駆動ストロークに
亘り等間隔に配置された位置検出コイル群、（３）は強
磁性体の制御棒駆動軸、（４）は位置検出コイル群（１
）の信号を取り出す検出抵抗、（５）は検出抵抗（４）
からの信号により制御棒位置を検出する信号検出回路（
６）は位置検出コイル群（１）に供給する電源（７）は
、電源（６）から位置検出コイル群（１）までのフィー
ルドケーブルが有する抵抗、（８）は制御棒挿入時間測
定時”ＯＮ“とするスイッチ、（９）は記録計へ信号を
送るためのバッファーである。FIG. 3 is a block diagram showing a conventional control rod position detection device. In FIG. (4) is the control rod drive shaft, (4) is the position detection coil group (1
) detection resistor to take out the signal, (5) is the detection resistor (4)
The signal detection circuit (which detects the control rod position by the signal from
6) is the resistance of the power supply (7) supplied to the position detection coil group (1), which is the resistance of the field cable from the power supply (6) to the position detection coil group (1), and (8) is the resistance when measuring the control rod insertion time. The switch (9) that is turned ON is a buffer for sending a signal to the recorder.
次に動作について説明する。位置検出コイル群（１）の
インダクタンスは強磁性体の制御棒駆動軸（３）の位置
によって変化し、制御棒駆動軸（３）が挿入された位置
検出コイル（ｌ−１〜１−ｍ−ｔ ）は、挿入されてい
ない位置検出コイル（１ｍ）のインダクタンスよりも大
きい。従って電源（６）を位置検出コイル群（１）に印
加し、位置検出抵抗群（４）にかかる電圧を測定すれば
、インダクタンスの大きいコイルに対応する電圧は小さ
く、インダクタンスの低いコイルに対応する電圧は小さ
くなる。これを信号検出回路（５）により電圧が低から
高に切り換わる点をとり出し、表示器により制御棒位置
を表示する。Next, the operation will be explained. The inductance of the position detection coil group (1) changes depending on the position of the ferromagnetic control rod drive shaft (3), and the inductance of the position detection coil group (1-1 to 1-m- t ) is larger than the inductance of the position detection coil (1 m) that is not inserted. Therefore, if the power source (6) is applied to the position detection coil group (1) and the voltage applied to the position detection resistor group (4) is measured, the voltage corresponding to the coil with high inductance will be small, and the voltage will correspond to the coil with low inductance. voltage becomes smaller. The point where the voltage switches from low to high is detected by the signal detection circuit (5), and the control rod position is displayed on the display.
また、原子炉スクラム時の制御棒挿入時間を測定する際
は、電源（６）を落しスイッチ（８）を閉じておけば、
強磁性体の制御棒駆動軸（３）が位置検出コイル群（１
）の中を重力により落下する際に、位置検出コイルｎ（
１）に電圧を誘起させるため、電源（６）から位置検出
コイル８￥（１）までのフィールドケーブルに電流が流
れ、フィールドケーブルの抵抗（７）により電圧降下を
生じ、この電圧信号（以降落下波形と称す）をバッファ
ー（９）を通し記録計に書かせれば第４図の如く波形が
描かれ、制御棒挿入時間を求めることが出来る。Also, when measuring the control rod insertion time during reactor scram, turn off the power (6) and close the switch (8).
The ferromagnetic control rod drive shaft (3) connects the position detection coil group (1
), the position detection coil n(
1), current flows through the field cable from the power supply (6) to the position detection coil 8 (1), causing a voltage drop due to the resistance (7) of the field cable, and this voltage signal (hereinafter referred to as a drop). If the waveform (referred to as a waveform) is passed through the buffer (9) and written on the recorder, the waveform as shown in Fig. 4 will be drawn, and the control rod insertion time can be determined.
なお、第４図におけるダッシュポット到達とは制御棒挿
入時減速開始点到達のことである。Note that reaching the dashpot in FIG. 4 means reaching the deceleration start point when inserting the control rod.
従来の制御棒位置検出装置は以上のように構成されてい
るので、位置検出コイル群（１）の配置間隔が大きいと
、滑らかな落下波形が得られず、ダッシュポット到達点
（ダッシュポットで速度が急激に変化すると波形の傾き
が変化する）を明確に求めることが出来ないという課題
があった。Since the conventional control rod position detection device is configured as described above, if the arrangement interval of the position detection coil group (1) is large, a smooth falling waveform cannot be obtained, and the dashpot arrival point (dashpot speed There was a problem in that it was not possible to clearly determine the slope of the waveform (the slope of the waveform changes when the waveform suddenly changes).
この発明は上記のような課題を解決するためになされた
もので、フィールドケーブル本数を最少限とし、ダッシ
ュポット致達点の落下波形を滑かにし、制御棒挿入時間
を正確に測定できる制御棒位置検出装置を得ることを目
的とする。This invention was made to solve the above-mentioned problems, and it is a control rod that minimizes the number of field cables, smoothes the falling waveform at the dashpot reaching point, and accurately measures the control rod insertion time. The purpose is to obtain a position detection device.
この発明に係る制御棒位置検出装置は、制御棒位置検出
コイルの他に、制御棒挿入時間測定用の補助コイルを追
加することにより、落下波形を滑らかに変化させダッシ
ュポット到達点（制御棒挿入時の減速開始点）を精度よ
（求めることを可能としたものである。The control rod position detection device according to the present invention smoothly changes the drop waveform by adding an auxiliary coil for measuring control rod insertion time in addition to the control rod position detection coil. This makes it possible to accurately determine the starting point of deceleration in time.
この発明における補助コイルは、ダッシュポット近辺に
おいて、位置検出コイルからの落下波形の谷間を補間す
ることにより制御棒落下速度の変化による落下波形の傾
きの変化を明瞭に出力されることが出来る。The auxiliary coil in this invention can clearly output changes in the slope of the falling waveform due to changes in the control rod falling speed by interpolating the valleys of the falling waveform from the position detection coil in the vicinity of the dashpot.
以下、この発明の一実施例を図について説明する。第１
図において、（１）は制御棒の駆動ストロークに亘り等
間隔に配置された位置検出コイル群、（２）はダッシュ
ポット近辺の位置検出コイルの間を埋めるように配置さ
れた補助コイル群（３）は強磁性体の制御棒駆動軸（４
）は位置検出コイル群（１）の信号を取り出す検出抵抗
、（５）は検出抵抗（４）からの信号（こより制御棒位
置を検出する信号検出回路、（６）は位置検出コイル群
（１）に供給する電源、（７）は電源（６）から位置検
出コイル群（１）または、補助コイル鮮（２）までのフ
ィールドケーブルが有する抵抗、（８）は制御棒挿入時
間測定時”ＯＮ”とするスイッチ（９）はバッファー、
Ｑｏは位置検出コイル群（１）からの信号と補助コイル
群（２）からの信号を加算する加算器、αυは補助コイ
ルからの信号レベルを調整する抵抗である。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is a group of position detection coils arranged at equal intervals over the drive stroke of the control rod, and (2) is a group of auxiliary coils (3) arranged to fill in the spaces between the position detection coils near the dashpot. ) is a ferromagnetic control rod drive shaft (4
) is a detection resistor that extracts the signal from the position detection coil group (1), (5) is a signal detection circuit that detects the control rod position from the signal from the detection resistor (4), and (6) is a signal detection circuit that extracts the signal from the position detection coil group (1). ), (7) is the resistance of the field cable from the power supply (6) to the position detection coil group (1) or the auxiliary coil group (2), and (8) is the resistance that is “ON” when measuring the control rod insertion time. ” switch (9) is a buffer,
Qo is an adder that adds the signal from the position detection coil group (1) and the signal from the auxiliary coil group (2), and αυ is a resistor that adjusts the signal level from the auxiliary coil.
制御棒の位置検出方式は従来方式と同等なため説明は省
略する。制御棒落下波形測定時、電源（６）を落し、ス
イッチ（８）を投入すれば、制御棒位置検出コイル群（
１）からの落下波形はバッファー９−ａに送られる。ま
た、補助コイル群（２）に誘起された電圧により、フィ
ールドケーブル（こ電流が流れ、（この電流は位置検出
コイル群（１）からの信号レベルと合せるためａυの抵
抗により調整されている）フィールドケーブルの抵抗７
−ｂにおける電圧降下、落下信号波形は９−ｂのバッフ
ァーに送られる。位置検出コイル群ａυからの落下信号
波形（９−ａの出力）と補助コイル群（２）からの落下
信号波形（９−ｂの出力）を加算すれば、位置検出コイ
ル群（１）のコイル間を制御棒駆動軸が落下する際の落
下信号の谷間を、補助コイル群（２）からの落下信号が
埋めるため、第２図に示すようにダッシュポット近傍で
はリップル率が小さくなり滑らかな信号出力となる。The control rod position detection method is the same as the conventional method, so its explanation will be omitted. When measuring the control rod falling waveform, if you turn off the power (6) and turn on the switch (8), the control rod position detection coil group (
The falling waveform from 1) is sent to buffer 9-a. In addition, due to the voltage induced in the auxiliary coil group (2), a current flows through the field cable (this current is adjusted by the resistance aυ to match the signal level from the position detection coil group (1)). Field cable resistance 7
The voltage drop at -b and the falling signal waveform are sent to the buffer at 9-b. By adding the fall signal waveform (output of 9-a) from the position detection coil group aυ and the fall signal waveform (output of 9-b) from the auxiliary coil group (2), the coils of the position detection coil group (1) Since the drop signal from the auxiliary coil group (2) fills the gap in the drop signal when the control rod drive shaft falls between the gaps, the ripple rate is small near the dashpot and the signal is smooth, as shown in Figure 2. This becomes the output.
このため、ダッシュポット到達が明確になる。Therefore, reaching the dashpot becomes clear.
従って記録計によりこの信号波形を書かせて、制御棒挿
入時間を正確１こ求めることが出来る。Therefore, by writing this signal waveform with a recorder, it is possible to accurately determine the control rod insertion time.
なお、上記実施例では制御棒挿入時間を求めるために記
録計に加算器α０からの出力信号波形を書かせる場合に
ついて説明したが、制御棒挿入時間は第２図に示す信号
波形から他の方法で求めてもよい。In addition, in the above embodiment, the case where the recorder writes the output signal waveform from the adder α0 in order to determine the control rod insertion time was explained, but the control rod insertion time can be calculated using other methods from the signal waveform shown in FIG. You can also find it by
また、補助コイル（２）はダッシュポット近傍の出力信
号波形を滑らかにする範囲に設ければよく、加算器ａ０
は補助コイル群（２）の出力を使用して、位置検出コイ
ル群（１）の出力のリップルが小さくなるように補正す
るものであればよい。In addition, the auxiliary coil (2) may be provided in a range that smooths the output signal waveform near the dashpot, and the adder a0
may be any correction that uses the output of the auxiliary coil group (2) to reduce ripples in the output of the position detection coil group (1).
以上のように、この発明によれば、ダッシュポット近辺
の位置検出コイルの間に補助コイルを追加するように構
成したので、落下信号波形を滑らかにし、落下速度変化
点（ダッシュポット）を正確にとらえることができるよ
うにしたために、精度の高い制御棒挿入時間を求めるこ
とができるものが得られる効果がある。As described above, according to the present invention, since the auxiliary coil is added between the position detection coils near the dashpot, the falling signal waveform is smoothed and the falling speed change point (dashpot) can be accurately detected. Since the control rod insertion time can be determined with high accuracy, it is possible to obtain the control rod insertion time with high accuracy.
第１図はこの発明の一実施例による制御棒位置検出装置
を・示すブロック図、第２図はこの発明により得られる
落下信号波形、第３図は従来の制御棒位置検出装置を示
すブロック図、第４図は従来の落下信号波形である。（
１）は位置検出コイル群、（２）は補助コイル群、（３
）は制御棒駆動軸、（４）は検出抵抗、（５）は信号検
出回路、（６）は電源、（７）はフィールドケーブル抵
抗、（８）は切換スイッチ％（９）はバッファ、Ｑｏは
加算器、ａυは信号調整抵抗。
なお、図中、同一符号は同一、又は相当部分を示す。Fig. 1 is a block diagram showing a control rod position detection device according to an embodiment of the present invention, Fig. 2 is a drop signal waveform obtained by this invention, and Fig. 3 is a block diagram showing a conventional control rod position detection device. , FIG. 4 shows a conventional falling signal waveform. (
1) is a position detection coil group, (2) is an auxiliary coil group, (3
) is the control rod drive shaft, (4) is the detection resistor, (5) is the signal detection circuit, (6) is the power supply, (7) is the field cable resistance, (8) is the changeover switch % (9) is the buffer, Qo is an adder, and aυ is a signal adjustment resistor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
ロークに沿つて所定間隔に配置された位置検出コイル、
上記制御棒駆動軸の制御棒挿入時の減速開始点近傍の上
記位置検出コイル間に配置された補助コイル、上記制御
棒駆動軸による制御棒挿入時に生ずる上記位置検出コイ
ルの出力を上記補助コイルの出力で補正して滑らかな波
形の出力にする補正手段、及びこの補正手段で補正され
た出力波形から制御棒挿入時間を求める手段を備えた制
御棒位置検出装置。a ferromagnetic control rod drive shaft; a position detection coil arranged at predetermined intervals along the drive stroke of the control rod drive shaft;
An auxiliary coil is arranged between the position detection coils near the deceleration start point of the control rod drive shaft when the control rod is inserted, and the output of the position detection coil that occurs when the control rod drive shaft is inserted is A control rod position detecting device comprising: a correction means for correcting the output to output a smooth waveform; and a means for determining a control rod insertion time from the output waveform corrected by the correction means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63299122A JPH02145995A (en) | 1988-11-25 | 1988-11-25 | Position detector of fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63299122A JPH02145995A (en) | 1988-11-25 | 1988-11-25 | Position detector of fuel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02145995A true JPH02145995A (en) | 1990-06-05 |
Family
ID=17868406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63299122A Pending JPH02145995A (en) | 1988-11-25 | 1988-11-25 | Position detector of fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02145995A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2770329A1 (en) * | 1997-10-23 | 1999-04-30 | Korea Electric Power Corp | Nuclear reactor rod drop time measuring procedure |
| WO2019075772A1 (en) * | 2017-10-16 | 2019-04-25 | 中核核电运行管理有限公司 | Fully-digital rod position measurement device and method therefor |
-
1988
- 1988-11-25 JP JP63299122A patent/JPH02145995A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2770329A1 (en) * | 1997-10-23 | 1999-04-30 | Korea Electric Power Corp | Nuclear reactor rod drop time measuring procedure |
| WO2019075772A1 (en) * | 2017-10-16 | 2019-04-25 | 中核核电运行管理有限公司 | Fully-digital rod position measurement device and method therefor |
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