JPH0260990B2 - - Google Patents
Info
- Publication number
- JPH0260990B2 JPH0260990B2 JP10360780A JP10360780A JPH0260990B2 JP H0260990 B2 JPH0260990 B2 JP H0260990B2 JP 10360780 A JP10360780 A JP 10360780A JP 10360780 A JP10360780 A JP 10360780A JP H0260990 B2 JPH0260990 B2 JP H0260990B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- supply pump
- drainage
- clean water
- cylindrical body
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/02—Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Description
【発明の詳細な説明】
本発明は原子力発電所および放射能取扱い施設
において、この施設から放出する排水の放射能を
モニタする排水モニタに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wastewater monitor for monitoring radioactivity in wastewater discharged from nuclear power plants and radioactivity handling facilities.
排水中の放射能をモニタする排水モニタは原子
力発電所等の運転管理、施設周辺の環境への放射
能放出管理などからきわめて重要な設備である。
従来の排水モニタは排水の放射能計測部配管に排
水を満して通水し、その外側から放射能を測定し
ている。この方式では計測部の配管内壁に放射性
物質が蓄積し、低放射能レベルの排水の測定は著
しく困難となる。この改良案として排水を計測部
配管の内壁に非接触で通水し、その外側から排水
放射能を測定する方式がある。この方式の排水モ
ニタを第１図に示す。この方式では、排水ポンプ
１で排水を送水し、整流体２、放水ノズル３を経
由して、計測部配管４の内壁に非接触で通水す
る。排水から放出される放射能の測定はしやへい
体５とコリメータ６で囲まれた放射線検出器７で
実施する。又、排水の通水開始及び停止時には放
水ノズル３から放出される排水の放水形が著しく
乱れる。この現象による計測部配管４の内壁の放
射能汚染を防止するため、計測部配管４の内壁に
は清浄水ポンプ８で清浄水を通水する。この場合
の清浄流を矢印９、排水流を矢印１０で示した。
以上が改良型排水モニタの構成である。この方式
を実際の原子力プラント等へ設置適用するために
は、排水を送水する送水ポンプの制御、同時に計
測部配管内壁へ通水する清浄水の通水制御が、重
要な問題となる。すなわち、排水の送水開始前に
は清浄水を通水させておかなければ、配管内壁の
放射能汚染を十分に制御できなないことなどか
ら、各ポンプの起動シーケンスが重要となる。 Drainage monitors that monitor radioactivity in wastewater are extremely important equipment for managing the operation of nuclear power plants, etc., and controlling the release of radioactivity into the environment around the facilities.
Conventional wastewater monitors fill the wastewater radioactivity measurement pipe with wastewater and measure the radioactivity from the outside. With this method, radioactive materials accumulate on the inner walls of the pipes in the measuring section, making it extremely difficult to measure wastewater with low radioactivity levels. As an improvement, there is a method in which wastewater is passed through the inner wall of the measuring pipe without contact, and wastewater radioactivity is measured from the outside. This type of drainage monitor is shown in Figure 1. In this system, wastewater is pumped by a drainage pump 1, and is passed through a flow regulator 2 and a water discharge nozzle 3 to the inner wall of the measuring section piping 4 without contacting it. Measurement of radioactivity released from wastewater is carried out using a radiation detector 7 surrounded by a shield 5 and a collimator 6. Furthermore, when the drainage water flow starts and stops, the shape of the water discharged from the water discharge nozzle 3 is significantly disturbed. In order to prevent radioactive contamination of the inner wall of the measuring section piping 4 due to this phenomenon, clean water is passed through the inner wall of the measuring section piping 4 by a clean water pump 8. The clean flow in this case is indicated by arrow 9, and the drain flow is indicated by arrow 10.
The above is the configuration of the improved drainage monitor. In order to install and apply this system to an actual nuclear power plant, etc., important issues are the control of the water pump that sends the waste water, and at the same time the control of the flow of clean water to the inner wall of the measurement pipe. In other words, the activation sequence of each pump is important because radioactive contamination on the inner walls of the pipes cannot be adequately controlled unless clean water is passed before starting the drainage water supply.
本発明の目的は排水モニタニングの他にシーケ
ンス制御を可能にした排水モニタを提供するもの
である。 An object of the present invention is to provide a drainage monitor that enables sequence control in addition to drainage monitoring.
本発明の目的は、少ない清浄水量で放射能を精
度よく測定できる排水モニタを提供することにあ
る。 An object of the present invention is to provide a drainage monitor that can accurately measure radioactivity with a small amount of clean water.
本発明の特徴は、排水供給ポンプを起動させる
時には清浄水供給ポンプを起動させた後に排水供
給ポンプを起動させ、排水供給ポンプが駆動した
後は清浄水供給ポンプの停止及び起動を所定時間
の間隔で間欠的に繰返し、及び清浄水供給ポンプ
を停止させる時には排水供給ポンプを停止させた
後に清浄水供給ポンプを停止させる制御手段を設
けたことにある。 A feature of the present invention is that when starting the drainage supply pump, the drainage supply pump is started after the clean water supply pump is started, and after the drainage supply pump is driven, the clean water supply pump is stopped and started at predetermined intervals. The present invention includes a control means that stops the clean water supply pump after stopping the drainage supply pump when the clean water supply pump is stopped.
本発明の好適な一実施例である排水モニタを第
２図及び第３図に基づいて説明する。本実施例の
構造の大部分は、第１図に示す従来の排水モニタ
の構造と同じである。異なる部分について以下に
説明する。 A drainage monitor which is a preferred embodiment of the present invention will be explained based on FIGS. 2 and 3. Most of the structure of this embodiment is the same as that of the conventional drainage monitor shown in FIG. The different parts will be explained below.
第２図に本発明の排水モニタの構成を示した。
放射線検出器７と放射性計測器２０で計測される
放射線はマイクロコンピユータ（一般的には制御
装置）２１でデータ処理され、出力装置２２から
放射能濃度を出力する。この制御装置２１で排水
の送水ポンプ１、清浄水の送水ポンプ８を制御す
る。制御装置２１にて行なわれる制御シーケンス
を第３図に示す。まず、制御装置２１に送水ポン
プ１の起動信号が入力された場合は、即座に送水
ポンプ８を起動させる。そして、送水ポンプ１
は、送水ポンプ８の起動から時間t1遅れて起動さ
れる。放射性物質を含む排水の計測部配管４への
供給を停止さる場合には、停止信号が制御装置２
１に入力される。この時、制御装置２１は、即座
に送水ポンプ１を停止させ、その後、時間t2の遅
れをもつて送水ポンプ８を停止する。時間t1は計
測部配管４の内壁に清浄水が均一に水膜を形成す
るまでの時間を示し、時間t2は送水ポンプ１を停
止してから排水の供給が完全に停止する（放水ノ
ズル３から排水がこぼら落ちるのが止まるまでの
時間を含む）までの時間を示している。具体的に
は、t1＝３分、t2＝５分程度である。以上のよう
な制御を行なうことによつて、計装部配管４の内
壁の放射能汚染が生じ易い排水の供給開始及び停
止時において清浄水が計装部配管４の内壁に沿つ
て流れており、その放射能汚染を防止することが
できる。 FIG. 2 shows the configuration of the drainage monitor of the present invention.
Radiation measured by the radiation detector 7 and the radioactivity measuring device 20 is data-processed by a microcomputer (generally a control device) 21, and a radioactivity concentration is output from an output device 22. This control device 21 controls the drainage pump 1 and the clean water pump 8. A control sequence performed by the control device 21 is shown in FIG. First, when a starting signal for the water pump 1 is input to the control device 21, the water pump 8 is immediately started. And water pump 1
is started with a delay of time t1 from the start of the water pump 8. When stopping the supply of wastewater containing radioactive materials to the measurement unit piping 4, a stop signal is sent to the control device 2.
1 is input. At this time, the control device 21 immediately stops the water pump 1, and then stops the water pump 8 with a delay of time t2 . Time t 1 indicates the time it takes for clean water to uniformly form a water film on the inner wall of the measuring pipe 4, and time t 2 indicates the time from when the water pump 1 is stopped to when the supply of waste water is completely stopped (water discharge nozzle 3 to (including the time until the drainage stops spilling) is shown. Specifically, t 1 = about 3 minutes, and t 2 = about 5 minutes. By performing the above control, clean water flows along the inner wall of the instrumentation section piping 4 when starting and stopping the supply of wastewater, which is likely to cause radioactive contamination of the inner wall of the instrumentation section piping 4. , its radioactive contamination can be prevented.
また、制御装置２１は、送水ポンプ１の起動後
でそのポンプ１の停止までの間、第４図に示すよ
うに所定時間の間隔をもつて送水ポンプ８を間欠
的に停止、起動さる。すなわち、送水ポンプ１の
起動から時間3経過後に送水ポンプ８は停止され
る。時間t3は、放水ノズル３から放出される排水
の放出形状が安定するまでの時間（乱れが小さく
なるまでの時間）である。具体的には、t3＝２分
程度である。その送水ポンプ８の停止後、時間t4
（25分）が経過した時に送水ポンプ８が再び起動
される。そして、その起動後、時間t5（５分）が
経過した時に送水ポンプ８が再び停止される。以
後、時間t4及び時間t5の間隔で、送水ポンプ８の
起動、停止が繰返される。このように清浄水の供
給を間欠的（時間t4＝25分、時間t5＝５分）に行
なうことによつて、必要な清浄水の量が清浄水の
供給を連続的に行なう場合に比べて約1/5に減少
する。特に、原子力発電所においては、清浄水の
量が減少することは清浄水を貯蔵するタンクの容
量が小さくてすむことになり、好都合である。 Further, the control device 21 intermittently stops and starts the water pump 8 at predetermined time intervals, as shown in FIG. 4, after the water pump 1 is started until the pump 1 is stopped. That is, the water pump 8 is stopped after time 3 has elapsed since the water pump 1 was started. The time t 3 is the time until the discharge shape of the waste water discharged from the water discharge nozzle 3 becomes stable (the time until the turbulence becomes small). Specifically, t 3 =about 2 minutes. After the water pump 8 stops, time t 4
(25 minutes), the water pump 8 is started again. Then, after the start, the water pump 8 is stopped again when time t 5 (5 minutes) has elapsed. Thereafter, the water pump 8 is repeatedly started and stopped at intervals of time t4 and time t5 . By supplying clean water intermittently (time t 4 = 25 minutes, time t 5 = 5 minutes) in this way, the amount of clean water required can be reduced compared to when supplying clean water continuously. This will be reduced to about 1/5 compared to the previous year. Particularly in a nuclear power plant, a reduction in the amount of clean water is advantageous because the capacity of a tank for storing clean water can be reduced.
送水ポンプ１を停止する場合は、送水ポンプ８
を最後に起動した時から時間t1経過後に停止す
る。 When stopping water pump 1, water pump 8
will stop after time t 1 has elapsed since the last time it was started.
以上述べた実施例は、計装部配管４の内壁の放
射能汚染が生じ易い排水の供給開始及び停止時に
おいてその放射能汚染を防止することができると
ともに送水ポンプ１が駆動されている間において
も清浄水の供給によつて計装部配管４の内壁の放
射能汚染を防止できる。従つて、常に良好な放射
能の検出精度が得られる。しかも、清浄水を間欠
的に供給するので、清浄水量が著しく少なくな
る。 The embodiment described above can prevent radioactive contamination of the inner wall of the instrumentation section piping 4 when starting and stopping the supply of wastewater, which is likely to cause radioactive contamination, and while the water pump 1 is being driven. Radioactive contamination of the inner wall of the instrumentation section piping 4 can also be prevented by supplying clean water. Therefore, good radioactivity detection accuracy can always be obtained. Moreover, since clean water is supplied intermittently, the amount of clean water is significantly reduced.
本発明は、少ない清浄水量で良好な放射能の検
出精度を得ることができる。 The present invention can obtain good radioactivity detection accuracy with a small amount of clean water.
第１図は従来の排水モニタの構造図、第２図は
本発明の好適な一実施例である排水モニタの構造
図、第３図は第２図における制御シーケンスを示
す説明図である。
１……排水ポンプ、７……放射線検出器、８…
…清浄水ポンプ、２０……放射線計測器、２１…
…制御装置、２２……出力装置。
FIG. 1 is a structural diagram of a conventional drainage monitor, FIG. 2 is a structural diagram of a drainage monitor that is a preferred embodiment of the present invention, and FIG. 3 is an explanatory diagram showing the control sequence in FIG. 2. 1... Drain pump, 7... Radiation detector, 8...
...Clean water pump, 20...Radiation measuring instrument, 21...
...control device, 22...output device.
Claims (1)
状体の中央部に配置されて前記筒状体の軸方向に
延び、しかも下方に開口する放水ノズルと、前記
放水ノズルに放射性排水を導く放射性排水導管
と、前記放射性排水導管に設けられた排水供給ポ
ンプと、前記放水ノズルの下端より上方で前記筒
状体と前記放水ノズルとの間にある空間に清浄水
を供給する清浄水供給ポンプと、前記放水ノズル
の下端より上方で前記筒状体と前記放水ノズルと
の間にある空間に設けられて、前記空間内に供給
された清浄水を前記筒状体の内壁に沿う清浄水流
として流出する手段と、前記放水ノズルから流出
した放射性排水流と前記清浄水流とが存在する部
分でしかも前記筒状体の外側に配置された放射線
検出器とを有する排水モニタにおいて、前記排水
供給ポンプを起動させる時には前記清浄水供給ポ
ンプを起動させた後に前記排水供給ポンプを起動
させ、前記排水供給ポンプが駆動した後は前記清
浄水供給ポンプの停止及び起動を所定時間の間隔
で間欠的に繰返し、及び前記清浄水供給ポンプを
停止させる時には前記排水供給ポンプを停止させ
た後に前記清浄水供給ポンプを停止させる制御手
段を設けたことを特徴とする排水モニタ。1. A cylindrical body disposed substantially vertically, a water discharge nozzle disposed in the center of the cylindrical body, extending in the axial direction of the cylindrical body, and opening downward, and a radioactive wastewater disposed in the water discharge nozzle. a radioactive drainage conduit that guides the water; a drainage supply pump installed in the radioactive drainage conduit; and clean water that supplies clean water to the space between the cylindrical body and the water nozzle above the lower end of the water nozzle. A supply pump is provided in a space above the lower end of the water discharge nozzle and between the cylindrical body and the water discharge nozzle, and the supply pump is provided in a space between the cylindrical body and the water discharge nozzle to direct clean water supplied into the space along the inner wall of the cylindrical body. In the drainage monitor, the drainage monitor has a means for flowing out as a water stream, and a radiation detector disposed outside the cylindrical body in a portion where the radioactive wastewater stream flowing out from the water discharge nozzle and the clean water stream exist. When starting the pump, start the clean water supply pump and then start the drainage supply pump, and after the drainage supply pump is driven, stop and start the clean water supply pump intermittently at predetermined time intervals. A drainage monitor characterized in that a control means is provided for repeatedly stopping the clean water supply pump and then stopping the clean water supply pump when stopping the clean water supply pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360780A JPS5729979A (en) | 1980-07-30 | 1980-07-30 | Drainage monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360780A JPS5729979A (en) | 1980-07-30 | 1980-07-30 | Drainage monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5729979A JPS5729979A (en) | 1982-02-18 |
| JPH0260990B2 true JPH0260990B2 (en) | 1990-12-18 |
Family
ID=14358453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10360780A Granted JPS5729979A (en) | 1980-07-30 | 1980-07-30 | Drainage monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5729979A (en) |
-
1980
- 1980-07-30 JP JP10360780A patent/JPS5729979A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5729979A (en) | 1982-02-18 |
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