JP5456408B2 - Radioactive gas monitor - Google Patents
Radioactive gas monitor Download PDFInfo
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- JP5456408B2 JP5456408B2 JP2009184399A JP2009184399A JP5456408B2 JP 5456408 B2 JP5456408 B2 JP 5456408B2 JP 2009184399 A JP2009184399 A JP 2009184399A JP 2009184399 A JP2009184399 A JP 2009184399A JP 5456408 B2 JP5456408 B2 JP 5456408B2
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- 230000002285 radioactive effect Effects 0.000 title claims description 22
- 238000005070 sampling Methods 0.000 claims description 78
- 230000005284 excitation Effects 0.000 claims description 42
- 238000011084 recovery Methods 0.000 claims description 9
- 238000010926 purge Methods 0.000 description 42
- 238000005259 measurement Methods 0.000 description 5
- 239000012080 ambient air Substances 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- Monitoring And Testing Of Nuclear Reactors (AREA)
- Measurement Of Radiation (AREA)
Description
この発明は、原子炉施設等の最終放出端の排気筒から放出される気体状放射性物質の放射能濃度を測定する放射性ガスモニタに関する。 The present invention relates to a radioactive gas monitor for measuring a radioactive concentration of a gaseous radioactive substance released from an exhaust stack at a final discharge end of a nuclear reactor facility or the like.
放射性ガスモニタの測定対象とする放射能レベルは、通常時のバックグラウンドレベルから事故を想定した高濃度レベルまで広い測定範囲をカバーする。放射性ガスモニタは、排気筒の排ガスをサンプリングし、試料ガス中の気体状放射性物質から放出される放射線を検出部で検出し、計測することにより放射能濃度が求められ、ポンプで試料ガスを排気筒から吸入し、排気筒へ排出する構成である。また、バックグラウンド放射線の影響を除くため、フィルタ等で浄化された空気で検出部をパージしてバックグラウンドを測定することとしており、試料ガスとパージの流路切換は、電磁弁による流路切換が一般的になってきている（例えば、特許文献１参照）。 The radioactivity level to be measured by the radioactive gas monitor covers a wide measurement range from a normal background level to a high concentration level assuming an accident. The radioactive gas monitor samples the exhaust gas from the exhaust pipe, detects the radiation emitted from the gaseous radioactive material in the sample gas by the detector, and measures the concentration to obtain the radioactivity concentration. It is the structure which inhales and discharges to an exhaust pipe. In order to eliminate the influence of background radiation, the background is measured by purging the detector with air purified by a filter or the like. Has become common (see, for example, Patent Document 1).
従来装置では、電磁弁を用いたことにより、プラント電源系統の瞬時停電後の電源復帰において、電源喪失で電磁弁が閉となって電磁弁からポンプまでの検出部を含む系統が運転時の負圧状態で隔離され、電源復帰で隔離された系統が開放されて運転を再開したタイミングで、残留負圧に起因した過渡流量がポンプ能力に加算して大きな流量が発生し、それにより流量指示がハンチングして流量低警報でポンプがトリップすることがあるという問題があった。
この発明は、プラント電源系統の瞬時停電後の電源復帰において、電磁弁からポンプまでの検出部を含む系統に負圧隔離箇所を発生させないことで、試料ガスの流れに大きな擾乱を発生させないことを目的とする。
In the conventional device, the solenoid valve is used, and when the power supply is restored after an instantaneous power failure of the plant power supply system, the solenoid valve is closed due to power loss and the system including the detection unit from the solenoid valve to the pump is negative during operation. At the timing when the system isolated by the pressure state and the system isolated by the power recovery is opened and restarted, the transient flow rate due to the residual negative pressure is added to the pump capacity, and a large flow rate is generated. There was a problem that the pump sometimes tripped due to low flow rate alarm due to hunting.
This invention does not cause a large disturbance in the flow of the sample gas by not generating a negative pressure isolation point in the system including the detection unit from the solenoid valve to the pump in the power recovery after the instantaneous power failure of the plant power system. Objective.
この発明に係る放射性ガスモニタは、原子力プラントの排気中の放射能濃度を測定する放射性ガスモニタにおいて、前記排気を放射能濃度測定部に吸入且つ排出するポンプと、励磁電源がオフのとき開、オンのとき閉となることにより、前記放射能濃度測定部に吸入される前記排気を開閉するサンプリング電磁弁と、前記放射性ガスモニタの主電源がオフのとき、前記サンプリング電磁弁の励磁電源がオフとなるように、且つ前記ポンプ吸入中に前記主電源が接続されているプラント電源系統に瞬時停電が発生した場合、瞬時停電直前、瞬時停電中、および電源復帰時のいずれにおいても前記サンプリング電磁弁が開の状態を維持し、電源復帰時に、瞬時停電直前の前記ポンプの動作状態を自動的に維持するように制御する制御部を備える。 The radioactive gas monitor according to the present invention is a radioactive gas monitor that measures the radioactive concentration in the exhaust of a nuclear power plant, and is a pump that sucks and discharges the exhaust into the radioactive concentration measuring unit, and is opened and turned on when the excitation power is off. When the sampling solenoid valve that opens and closes the exhaust gas sucked into the radioactivity concentration measurement unit and the main power source of the radioactive gas monitor are turned off, the excitation power source of the sampling solenoid valve is turned off. In addition, when a momentary power failure occurs in the plant power system to which the main power source is connected during the pump suction, the sampling solenoid valve is opened immediately before the momentary power failure, during the momentary power failure, and at the time of power recovery. A control unit is provided for maintaining the state and controlling so as to automatically maintain the operation state of the pump immediately before the instantaneous power failure when the power is restored.
この発明は、プラント電源系統の瞬時停電後の電源復帰において、電磁弁からポンプまでの検出部を含む系統に負圧隔離箇所を発生させないことで、試料ガスの流れに大きな擾乱を発生させないため、サンプリング継続という観点で信頼性の高い装置を提供できる。 Since this invention does not generate a large disturbance in the flow of the sample gas by not generating a negative pressure isolation point in the system including the detection unit from the solenoid valve to the pump in the power recovery after the instantaneous power failure of the plant power supply system, A highly reliable apparatus can be provided from the viewpoint of continuing sampling.
実施の形態１．
図１は、この発明を実施するための実施の形態１における放射性ガスモニタの構成を示すものであり、図２は、実施の形態１における電磁弁開閉のタイミングを示すものであり、図３は、実施の形態１における制御部の論理回路を示すものである。図１において、排気筒１は原子炉施設等の最終放出端、２は排気筒１から試料ガスをサンプリングするサンプリング部、３はサンプリング部２を制御する制御部、４は試料ガス中の気体状放射性物質から放出される放射線から放射能濃度を測定する測定部、２２はサンプリング部２から試料ガスを選択導入するサンプリング電磁弁、２３はパージフィルタ、２４はパージのために周辺空気を選択導入するパージ電磁弁、２５は流量計、２６は圧力計、フィルタ系統２１ａはフィルタ入口弁２１１ａ、試料ガスフィルタ２１２ａ、フィルタ出口弁２１３ａを備え、フィルタ系統２１ｂはフィルタ入口弁２１１ｂ、試料ガスフィルタ２１２ｂ、フィルタ出口弁２１３ｂを備え、ポンプ系統２７ａはポンプ入口弁２７１ａ、ポンプ２７２ａ、ポンプ出口弁２７３ａを備え、ポンプ系統２７ｂはポンプ入口弁２７１ｂ、ポンプ２７２ｂ、ポンプ出口弁２７３ｂを備える。図１で、弁の開閉状態は、黒塗りつぶしが閉、白抜きが開を表す。
サンプリング電磁弁２２は、励磁電源がオフのとき開、励磁電源がオンのとき閉となるもの、パージ電磁弁２４は、励磁電源がオフのとき閉、励磁電源がオンのとき開となるものを使用する。励磁電源のオンとオフは、制御部３の論理回路により決定されている。論理回路の出力が「１」のとき励磁電源はオン、論理回路の出力が「０」のとき励磁電源はオフとなる。
Embodiment 1 FIG.
FIG. 1 shows the configuration of a radioactive gas monitor in Embodiment 1 for carrying out the present invention, FIG. 2 shows the timing of electromagnetic valve opening and closing in Embodiment 1, and FIG. 2 shows a logic circuit of a control unit in the first embodiment. In FIG. 1, an exhaust tube 1 is a final discharge end of a nuclear reactor facility, 2 is a sampling unit that samples a sample gas from the exhaust tube 1, 3 is a control unit that controls the sampling unit 2, and 4 is a gaseous state in the sample gas. Measuring unit for measuring the radioactivity concentration from the radiation emitted from the radioactive substance, 22 is a sampling solenoid valve for selectively introducing the sample gas from the sampling unit 2, 23 is a purge filter, and 24 is for selectively introducing ambient air for purging. Purge solenoid valve, 25 is a flow meter, 26 is a pressure gauge, the
The sampling solenoid valve 22 is opened when the excitation power is off and closed when the excitation power is on. The purge solenoid valve 24 is closed when the excitation power is off and opened when the excitation power is on. use. The on / off state of the excitation power source is determined by the logic circuit of the control unit 3. When the output of the logic circuit is “1”, the excitation power supply is on, and when the output of the logic circuit is “0”, the excitation power supply is off.
放射性ガスモニタの主電源は、主電源投入でプラント電源系統に接続され、プラント電源系統に瞬時停電が発生した場合、追従して瞬時停電する。
サンプリング部２において、排気筒１からサンプリングされた試料ガスは、並列に設けられた２つのフィルタ系統２１ａ又は２１ｂのいずれかを通してサンプリング電磁弁２２に導入され、周辺空気は、パージフィルタ２３を通してパージ電磁弁２４に導入され、制御部３でサンプリング電磁弁２２とパージ電磁弁２４を切換制御する。サンプリング電磁弁２２の出口とパージ電磁弁２４の出口は接続合流され、流量計２５で試料ガス（又は吸入された周辺空気）の流量が測定され、圧力計２６で試料ガス（又は吸入された周辺空気）の圧力が測定され、測定部４で試料ガス（又は吸入された周辺空気）の放射能濃度が測定され、測定部４から排出された試料ガスはポンプ系統２７ａ又は２７ｂのいずれかに導入されて排気筒１に戻される。
The main power supply of the radioactive gas monitor is connected to the plant power supply system when the main power supply is turned on.
In the sampling unit 2, the sample gas sampled from the exhaust pipe 1 is introduced into the sampling electromagnetic valve 22 through either of two
サンプリング時のフィルタ取替は、圧力計２６で圧力を測定して取替基準になったら、使用していないフィルタ系統の入口弁と出口弁を閉から開にし、次に、使用してきたフィルタ系統の入口弁と出口弁を開から閉にしてフィルタを取り替えるという手順で行う。取替基準を設けて運用する代わりに定期的にフィルタ取替を行う運用としても良い。
流量計２５は、流量が所定の値を下回って所定の時間継続したら流量低警報を発信するようにすることにより、小さい脈動で誤動作するのを防止する。流量低警報が発信したら、ポンプがトリップしたとして、運転中のポンプから停止中のポンプに切り換える。制御部３は、ポンプ毎に流量低警報を自己保持し、リセットすることにより待機状態に移行し、待機状態のポンプへのみ自動切換が可能とする。
When replacing the filter at the time of sampling, when the pressure is measured by the pressure gauge 26 and becomes the replacement reference, the inlet valve and the outlet valve of the unused filter system are opened from the closed state, and then the used filter system is used. The procedure is to change the filter by opening and closing the inlet and outlet valves. It is good also as operation which performs filter replacement regularly instead of setting and operating a replacement standard.
The flow meter 25 prevents a malfunction due to small pulsations by issuing a low flow rate alarm when the flow rate falls below a predetermined value and continues for a predetermined time. When the low flow rate alarm is issued, the pump is tripped and switched from the operating pump to the stopped pump. The control unit 3 self-holds a low flow rate alarm for each pump, and shifts to a standby state by resetting the pump. Only the pump in the standby state can be automatically switched.
次に動作について、図２にそって、図３の論理回路の動きを説明する。
初期状態の場合、放射性ガスモニタの主電源が投入されていないので、主電源投入が「０」、ポンプ停止中なので、ポンプ２７２ａ及び２７２ｂ起動が「０」、サンプリング選択が「１」、パージ選択が「０」となるため、サンプリング電磁弁の励磁電源及びパージ電磁弁の励磁電源の直前のＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開、パージ電磁弁２４は、励磁電源がオフで閉となる。
放射性ガスモニタの主電源投入時の場合、主電源投入が「１」となり、ポンプのＯＲ回路の出力「０」とサンプリング選択「１」でＡＮＤ回路の出力が「０」となり、サンプリング選択のＡＮＤ回路の出力「０」がＮＯＴ回路で「１」となり、主電源投入「１」とＮＯＴ回路の出力「１」でＡＮＤ回路の出力が「１」となり、サンプリング電磁弁２２は、励磁電源がオンで閉となる。
Next, the operation of the logic circuit of FIG. 3 will be described with reference to FIG.
In the initial state, since the main power of the radioactive gas monitor is not turned on, the main power on is “0”, and the pump is stopped, so that the pumps 272a and 272b are activated “0”, the sampling selection is “1”, and the purge selection is Since it becomes “0”, the output of the AND circuit immediately before the excitation power source of the sampling solenoid valve and the excitation power source of the purge solenoid valve becomes “0”, and the sampling solenoid valve 22 opens when the excitation power source is off, and the purge solenoid valve 24 Is closed when the excitation power is off.
When the main power of the radioactive gas monitor is turned on, the main power is turned on to "1", the output of the OR circuit of the pump is "0" and the sampling selection is "1", and the output of the AND circuit is "0". Output “0” becomes “1” in the NOT circuit, and the output of the AND circuit becomes “1” when the main power is turned on “1” and the output “1” of the NOT circuit, and the sampling solenoid valve 22 has the excitation power turned on. Closed.
サンプリング時の場合、ポンプ運転開始でサンプリングを開始するので、ポンプ２７２ａ又は２７２ｂ起動が「１」となり起動状態が回路に自己保持され、ポンプのＯＲ回路の出力が「１」となり、ポンプのＯＲ回路の出力「１」とサンプリング選択「１」でＡＮＤ回路の出力が「１」となり、サンプリング選択のＡＮＤ回路の出力「１」がＮＯＴ回路で「０」となり、主電源投入「１」とＮＯＴ回路の出力「０」でＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開となる。
パージ選択時の場合、サンプリング選択が「０」でパージ選択が「１」となり、ポンプのＯＲ回路の出力「１」とサンプリング選択「０」でＡＮＤ回路の出力が「０」となり、サンプリング選択のＡＮＤ回路の出力「０」がＮＯＴ回路で「１」となり、主電源投入「１」とＮＯＴ回路の出力「１」でＡＮＤ回路の出力が「１」となり、サンプリング電磁弁２２は、励磁電源がオンで閉、ポンプのＯＲ回路の出力「１」とパージ選択「１」でＡＮＤ回路の出力が「１」となり、主電源投入「１」とパージ選択のＡＮＤ回路の出力「１」でＡＮＤ回路の出力が「１」となり、パージ電磁弁２４は、励磁電源がオンで開となる。
In the case of sampling, since sampling is started at the start of pump operation, the activation of the pump 272a or 272b is “1”, the activation state is self-held in the circuit, the output of the OR circuit of the pump is “1”, and the OR circuit of the pump The output of the AND circuit becomes "1" when the output "1" and the sampling selection "1", the output "1" of the AND circuit of the sampling selection becomes "0" in the NOT circuit, the main power supply "1" and the NOT circuit When the output of the AND circuit is “0”, the output of the AND circuit becomes “0”, and the sampling solenoid valve 22 is opened when the excitation power supply is off.
In the case of purge selection, the sampling selection is “0” and the purge selection is “1”, the output of the OR circuit of the pump is “1” and the sampling selection is “0”, and the output of the AND circuit is “0”. The output “0” of the AND circuit becomes “1” in the NOT circuit, the output of the AND circuit becomes “1” when the main power is turned on “1” and the output “1” of the NOT circuit, and the sampling solenoid valve 22 has the excitation power supply. When ON, the output of the OR circuit of the pump is "1" and the purge selection is "1", the output of the AND circuit is "1", and when the main power is turned on "1" and the output of the purge selection AND circuit is "1" Becomes “1”, and the purge solenoid valve 24 is opened when the excitation power supply is turned on.
サンプリング時にプラント電源系統に瞬時停電があった場合、瞬時停電中は、主電源投入が「０」となり、サンプリング電磁弁の励磁電源の直前のＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開となる。電源復帰時は、瞬時停電直前のサンプリング時と同様に論理回路が動作するので、サンプリング電磁弁２２は、励磁電源がオフで開となる。従って、サンプリング時は、瞬時停電直前、瞬時停電中、電源復帰時のいずれにおいても、サンプリング電磁弁２２が開の状態を継続する。
パージ選択時にプラント電源系統に瞬時停電があった場合、瞬時停電中は、主電源投入が「０」となり、サンプリング電磁弁の励磁電源及びパージ電磁弁の励磁電源の直前のＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開、パージ電磁弁２４は、励磁電源がオフで閉となる。電源復帰時は、瞬時停電直前のパージ選択時と同様に論理回路が動作するので、サンプリング電磁弁２２は、励磁電源がオンで閉、パージ電磁弁２４は、励磁電源がオンで開となる。
If there is an instantaneous power failure in the plant power system during sampling, the main power supply is “0” during the instantaneous power failure, the output of the AND circuit immediately before the excitation power of the sampling solenoid valve is “0”, and the sampling solenoid valve 22 Is opened when the excitation power is off. When power is restored, the logic circuit operates in the same way as during sampling immediately before an instantaneous power failure, so that the sampling solenoid valve 22 is opened when the excitation power is off. Therefore, at the time of sampling, the sampling solenoid valve 22 is kept open immediately before the momentary power failure, during the momentary power failure, and at the time of power recovery.
If there is a momentary power failure in the plant power supply system when purge is selected, the main power supply is “0” during the momentary power failure, and the output of the AND circuit immediately before the excitation power source for the sampling solenoid valve and the excitation power source for the purge solenoid valve is “ The sampling solenoid valve 22 is opened when the excitation power is off, and the purge solenoid valve 24 is closed when the excitation power is off. When the power is restored, the logic circuit operates in the same manner as the purge selection immediately before the momentary power failure. Therefore, the sampling solenoid valve 22 is closed when the excitation power is on, and the purge solenoid valve 24 is opened when the excitation power is on.
以上のように、実施の形態１では、サンプリング中にプラント電源系統に瞬時停電があった場合、瞬時停電直前、瞬時停電中、電源復帰時のいずれにおいても、サンプリング電磁弁２２が開の状態を継続し、電磁弁からポンプまでの測定部４を含む系統に負圧隔離箇所を発生させないことで、電源復帰時に試料ガスの流れに大きな擾乱を発生させないため、流量指示がハンチングして流量低警報が発信してポンプがトリップする問題が発生しなくなり、サンプリング継続という観点で信頼性の高い装置を提供できる。
また、サンプリング中は、電磁弁が励磁されない運用のため、自己発熱によるコイル絶縁低下あるいは飛来して電磁弁内に付着した付着物がコイル発熱の高温下で変質して粘性を持ち、電磁弁の動作不良に至る要因を本質的に排除することにより電磁弁の故障率を飛躍的に下げることができる。
また、サンプリング中に電磁弁が万一故障しても、サンプリング電磁弁２２が開の状態のため、サンプリングを継続できると共に、放射性気体廃棄物処理施設の破損、燃料集合体の落下等、一過性の事故に対しても確実に放出管理ができるので、サンプリング継続という観点で装置の信頼性を大幅に向上させる効果を奏する。
As described above, in the first embodiment, when there is an instantaneous power failure in the plant power system during sampling, the sampling solenoid valve 22 is in an open state immediately before the instantaneous power failure, during the instantaneous power failure, or at the time of power recovery. Continuously, by not generating a negative pressure isolation point in the system including the measuring unit 4 from the solenoid valve to the pump, a large disturbance in the flow of the sample gas will not occur when the power is restored. Therefore, the problem that the pump trips due to the occurrence of the error does not occur, and a highly reliable apparatus can be provided from the viewpoint of continuing sampling.
In addition, during sampling, the solenoid valve is not energized, so that the coil insulation decreases or flies due to self-heating and the deposits attached to the solenoid valve change in viscosity at high temperatures of the coil heat and become viscous. The failure rate of the solenoid valve can be drastically reduced by essentially eliminating the factors that lead to malfunction.
Even if the solenoid valve breaks down during sampling, the sampling solenoid valve 22 is open, so that sampling can be continued and the radioactive gas waste treatment facility is damaged, the fuel assembly is dropped, etc. Therefore, it is possible to reliably control release even in the event of accidents, so that the reliability of the apparatus is greatly improved from the viewpoint of continuing sampling.
また、各電磁弁の上流にフィルタを設置することにより電磁弁を粒子状物質から保護でき、入口弁と出口弁を設けた試料ガスフィルタを２系統備え、圧力計で圧損増大を監視して運転中に試料ガスフィルタを交換できるようにしたので、一過性の事故に対してもフィルタ取替保守に起因する取りこぼしを無くして確実に放出放射能を測定できる。
また、入口弁、出口弁を設けたポンプを２系統備え、運転中のポンプ故障を流量低で検知してポンプを自動切換するようにしたので、一過性の事故に対してもポンプ故障に起因する取りこぼしを無くして確実に放出放射能を測定できる。
In addition, by installing a filter upstream of each solenoid valve, the solenoid valve can be protected from particulate matter, and equipped with two sample gas filters with an inlet valve and an outlet valve, which are operated by monitoring the pressure loss increase with a pressure gauge. Since the sample gas filter can be exchanged, it is possible to reliably measure the emitted radioactivity even in the case of a transient accident, eliminating the loss caused by filter replacement maintenance.
In addition, two pumps with an inlet valve and an outlet valve are provided, and a pump failure during operation is detected at a low flow rate and the pump is automatically switched. It is possible to reliably measure the released radioactivity without causing any oversight.
実施の形態２．
実施の形態１では、サンプリング電磁弁２２とパージ電磁弁２４の一方が開になったら、もう一方は閉になるように同時に動作するが、実施の形態２では、サンプリング電磁弁２２及びパージ電磁弁２４が開から閉へ切り換わるときに設定した時間遅れて閉になるように遅延回路を制御部３に備えるものである。図４は、実施の形態２における制御部の論理回路を示すものであり、図５は、実施の形態２における電磁弁開閉のタイミングを示すものである。
次に動作について、図５にそって、図４の論理回路の動きを説明する。図４において、オフディレイ回路は、入力が「１」から「０」に変化した場合のみ、設定した時間遅れて出力が出るが、それ以外は、すぐに出力が出るものである。
Embodiment 2. FIG.
In the first embodiment, when one of the sampling solenoid valve 22 and the purge solenoid valve 24 is opened, the other is simultaneously operated so as to be closed. However, in the second embodiment, the sampling solenoid valve 22 and the purge solenoid valve are operated. A delay circuit is provided in the control unit 3 so as to be closed with a time delay set when 24 is switched from open to closed. FIG. 4 shows the logic circuit of the control unit in the second embodiment, and FIG. 5 shows the timing of opening and closing the electromagnetic valve in the second embodiment.
Next, the operation of the logic circuit of FIG. 4 will be described with reference to FIG. In FIG. 4, the off-delay circuit outputs output with a set time delay only when the input changes from “1” to “0”, but otherwise outputs immediately.
初期状態とポンプ運転開始のサンプリング時は、実施の形態１と同様なので、説明を省略する。
パージ選択時の場合、サンプリング選択が「０」でパージ選択が「１」となり、ポンプのＯＲ回路の出力「１」とサンプリング選択「０」でＡＮＤ回路の出力が「０」となり、オフディレイ回路の入力が「１」から「０」に変わるので、設定した時間遅れて、オフディレイ回路の出力が「０」となり、オフディレイ回路の出力「０」がＮＯＴ回路で「１」となり、主電源投入「１」とＮＯＴ回路の出力「１」でＡＮＤ回路の出力が「１」となり、サンプリング電磁弁２２は、励磁電源がオンで閉になる。従って、サンプリング電磁弁２２は、開から閉に切り換わるときに設定した時間遅れて、閉となる。
ポンプのＯＲ回路の出力「１」とパージ選択「１」でＡＮＤ回路の出力が「１」となり、オフディレイ回路の入力が「０」から「１」に変わるので、すぐにオフディレイ回路の出力が「１」となり、主電源投入「１」とオフディレイ回路の出力「１」でＡＮＤ回路の出力が「１」となり、パージ電磁弁２４は、励磁電源がオンで開となる。
Since the initial state and sampling at the start of pump operation are the same as in the first embodiment, description thereof is omitted.
In the case of purge selection, the sampling selection is “0” and the purge selection is “1”, the output of the OR circuit of the pump is “1” and the sampling selection is “0”, the output of the AND circuit is “0”, and the off delay circuit Since the input of “1” changes from “1” to “0”, the output of the off-delay circuit becomes “0” after a set time delay, and the output “0” of the off-delay circuit becomes “1” in the NOT circuit. When the input is “1” and the output of the NOT circuit is “1”, the output of the AND circuit is “1”, and the sampling solenoid valve 22 is closed when the excitation power supply is turned on. Therefore, the sampling solenoid valve 22 is closed after a set time delay when switching from open to closed.
When the pump OR circuit output “1” and purge selection “1”, the AND circuit output changes to “1” and the off-delay circuit input changes from “0” to “1”. Becomes “1”, the output of the AND circuit becomes “1” when the main power is turned on “1” and the output “1” of the off-delay circuit, and the purge solenoid valve 24 is opened when the excitation power is turned on.
パージ選択後のサンプリング時の場合、サンプリング選択が「１」でパージ選択が「０」となり、ポンプのＯＲ回路の出力「１」とサンプリング選択「１」でＡＮＤ回路の出力が「１」となり、オフディレイ回路の入力が「０」から「１」に変わるので、すぐにオフディレイ回路の出力が「１」となり、オフディレイ回路の出力「１」がＮＯＴ回路で「０」となり、主電源投入「１」とＮＯＴ回路の出力「０」でＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開となる。
ポンプのＯＲ回路の出力「１」とパージ選択「０」でＡＮＤ回路の出力が「０」となり、オフディレイ回路の入力が「１」から「０」に変わるので、設定した時間遅れて、オフディレイ回路の出力が「０」となり、主電源投入「１」とオフディレイ回路の出力「０」でＡＮＤ回路の出力が「０」となり、パージ電磁弁２４は、励磁電源がオフで閉になる。従って、パージ電磁弁２４は、開から閉に切り換わるときに設定した時間遅れて、閉になる。
In the case of sampling after purge selection, the sampling selection is “1” and the purge selection is “0”, the output of the OR circuit of the pump is “1” and the sampling selection is “1”, and the output of the AND circuit is “1”. Since the input of the off delay circuit changes from “0” to “1”, the output of the off delay circuit immediately becomes “1”, the output “1” of the off delay circuit becomes “0” in the NOT circuit, and the main power is turned on. When “1” and the output of the NOT circuit “0”, the output of the AND circuit becomes “0”, and the sampling solenoid valve 22 is opened when the excitation power supply is off.
When the pump OR circuit output is “1” and the purge selection is “0”, the AND circuit output is “0” and the off-delay circuit input is changed from “1” to “0”. The output of the delay circuit becomes “0”, the output of the AND circuit becomes “0” when the main power is turned on “1” and the output of the off-delay circuit “0”, and the purge solenoid valve 24 is closed when the excitation power is off. . Therefore, the purge solenoid valve 24 is closed after a set time delay when switching from open to closed.
サンプリング時にプラント電源系統に瞬時停電があった場合、瞬時停電中は、主電源投入が「０」となり、サンプリング電磁弁の励磁電源の直前のＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開となる。電源復帰時は、瞬時停電直前のサンプリング時と同様に論理回路が動作するので、サンプリング電磁弁２２は、励磁電源がオフで開となる。従って、サンプリング時は、瞬時停電直前、瞬時停電中、電源復帰時のいずれにおいても、サンプリング電磁弁２２が開の状態を継続する。
パージ選択時にプラント電源系統に瞬時停電があった場合、瞬時停電中は、主電源投入が「０」となり、サンプリング電磁弁の励磁電源及びパージ電磁弁の励磁電源の直前のＡＮＤ回路の出力が「０」となり、サンプリング電磁弁２２は、励磁電源がオフで開、パージ電磁弁２４は、励磁電源がオフで閉となる。電源復帰時は、瞬時停電直前のパージ選択時と同様に論理回路が動作するので、サンプリング電磁弁２２は、設定した時間遅れて、励磁電源がオンで閉、パージ電磁弁２４は、励磁電源がオンで開となる。
If there is an instantaneous power failure in the plant power system during sampling, the main power supply is “0” during the instantaneous power failure, the output of the AND circuit immediately before the excitation power of the sampling solenoid valve is “0”, and the sampling solenoid valve 22 Is opened when the excitation power is off. When power is restored, the logic circuit operates in the same way as during sampling immediately before an instantaneous power failure, so that the sampling solenoid valve 22 is opened when the excitation power is off. Therefore, at the time of sampling, the sampling solenoid valve 22 is kept open immediately before the momentary power failure, during the momentary power failure, and at the time of power recovery.
If there is a momentary power failure in the plant power supply system when purge is selected, the main power supply is “0” during the momentary power failure, and the output of the AND circuit immediately before the excitation power source for the sampling solenoid valve and the excitation power source for the purge solenoid valve is “ The sampling solenoid valve 22 is opened when the excitation power is off, and the purge solenoid valve 24 is closed when the excitation power is off. When the power is restored, the logic circuit operates in the same manner as the purge selection immediately before the momentary power failure. Therefore, the sampling solenoid valve 22 is delayed by the set time and the excitation power supply is turned on and closed, and the purge solenoid valve 24 is supplied with the excitation power supply. Open when turned on.
以上のように、サンプリング電磁弁２２とパージ電磁弁２４が切り換わるときに両方とも開になるタイミングを設けても、サンプリング中にプラント電源系統に瞬時停電があった場合、瞬時停電直前、瞬時停電中、電源復帰時のいずれにおいても、サンプリング電磁弁２２が開の状態を継続し、電磁弁からポンプまでの測定部４を含む系統に負圧隔離箇所を発生させないことで、電源復帰時に試料ガスの流れに大きな擾乱を発生させないため、流量指示がハンチングして流量低警報が発信してポンプがトリップする問題が発生しなくなり、サンプリング継続という観点で信頼性の高い装置を提供できる。
また、サンプリング電磁弁２２及びパージ電磁弁２４が開から閉へ切り換わるときに設定した時間遅れて閉になるように遅延回路を制御部３に備えたので、経年劣化で電磁弁の動作が鈍くなっても瞬時たりとも閉塞が発生しなくなり、サンプリング継続という観点での信頼性を更に高める効果を奏する。
As described above, even if the timing for opening both of the sampling solenoid valve 22 and the purge solenoid valve 24 is provided, if there is an instantaneous power failure in the plant power supply system during sampling, During both power and power recovery, the sampling solenoid valve 22 is kept open, and no negative pressure isolation is generated in the system including the measuring unit 4 from the solenoid valve to the pump. Therefore, there is no problem that the flow rate instruction is hunting and a low flow rate alarm is issued to cause the pump to trip, and a highly reliable apparatus can be provided from the viewpoint of continuing sampling.
In addition, since the control circuit 3 is provided with a delay circuit so that the sampling solenoid valve 22 and the purge solenoid valve 24 are closed after the set time when the sampling solenoid valve 22 and the purge solenoid valve 24 are switched from open to closed, the operation of the solenoid valve becomes slow due to deterioration over time. Even in such a case, the blockage does not occur instantaneously, and the effect of further improving the reliability in terms of continuing sampling is obtained.
１ 排気筒
２ サンプリング部
２１ａ、２１ｂ フィルタ系統
２１１ａ、２１１ｂ フィルタ入口弁
２１２ａ、２１２ｂ 試料ガスフィルタ
２１３ａ、２１３ｂ フィルタ出口弁
２２ サンプリング電磁弁
２３ パージフィルタ
２４ パージ電磁弁
２５ 流量計
２６ 圧力計
２７ａ、２７ｂ ポンプ系統
２７１ａ、２７１ｂ ポンプ入口弁
２７２ａ、２７２ｂ ポンプ
２７３ａ、２７３ｂ ポンプ出口弁
３ 制御部
４ 測定部
1 Exhaust pipe 2
211a, 211b Filter inlet valve
212a, 212b Sample gas filter
213a, 213b Filter outlet valve 22 Sampling solenoid valve 23 Purge filter 24 Purge solenoid valve 25 Flow meter 26 Pressure gauge 27a, 27b Pump system
271a, 271b Pump inlet valve
272a, 272b pump
273a, 273b Pump outlet valve 3 Control unit 4 Measurement unit
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| JP6433365B2 (en) * | 2015-04-03 | 2018-12-05 | 三菱電機株式会社 | Radiation monitor |
| CN108730606B (en) * | 2017-04-17 | 2023-09-08 | 江苏核电有限公司 | Radioactive gas sampling electromagnetic valve position misoperation monitoring system and method |
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| JPH0222588A (en) * | 1988-07-12 | 1990-01-25 | Toshiba Corp | Radioactive material sampling device |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |