JP6014388B2 - Radioactive leakage water monitoring system and radioactive leakage water monitoring method - Google Patents
Radioactive leakage water monitoring system and radioactive leakage water monitoring method Download PDFInfo
- Publication number
- JP6014388B2 JP6014388B2 JP2012144909A JP2012144909A JP6014388B2 JP 6014388 B2 JP6014388 B2 JP 6014388B2 JP 2012144909 A JP2012144909 A JP 2012144909A JP 2012144909 A JP2012144909 A JP 2012144909A JP 6014388 B2 JP6014388 B2 JP 6014388B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- monitoring system
- leaked
- leakage
- radioactive
- 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.)
- Active
Links
Landscapes
- Measurement Of Radiation (AREA)
- Examining Or Testing Airtightness (AREA)
Description
本発明は、放射性物質を含む汚染水処理設備からの漏洩水を監視する放射線モニタリングシステムに係り、特に、光刺激ルミネセンス（以下、ＯＳＬと略称）を用いるＯＳＬ光ファイバ型多点放射線計測技術を採用し、漏洩水の漏洩場所を速やかに識別モニタリングするのに好適な放射性漏洩水モニタリングシステムに関する。 The present invention relates to a radiation monitoring system for monitoring leaked water from a contaminated water treatment facility containing radioactive substances, and in particular, an OSL optical fiber type multipoint radiation measurement technique using light-stimulated luminescence (hereinafter abbreviated as OSL). The present invention relates to a radioactive leakage water monitoring system that is suitable for quickly identifying and monitoring the location of leakage water leakage.
原子力発電所の事故処理に係る汚染水処理設備では、１００以上の放射性物質回収タンクや数kmに亘る配管群からの放射性汚染水漏洩監視を常時行っている。この漏洩監視点は数１,０００ヶ所にもなり、漏洩監視の作業量低減や効率的な監視技術を含め、その汚染水漏洩監視の改善が強く望まれている。また、上記放射性汚染水の主成分はＣｓ−１３４、Ｃｓ−１３７のγ線放出核種とＳｒ−９０／Ｙ−９０の純β線放出核種である。このγ線放出核種が混在する中での純β線核種を指標とした漏洩監視技術も強く望まれている。 In a contaminated water treatment facility related to accident handling at a nuclear power plant, radioactive leaked water is constantly monitored from over 100 radioactive substance recovery tanks and several kilometers of piping. There are several thousand leak monitoring points, and it is strongly desired to improve the monitoring of contaminated water leaks, including reducing the amount of work for leak monitoring and efficient monitoring technology. The main components of the radioactive contamination water are Cs-134 and Cs-137 γ-ray emitting nuclides and Sr-90 / Y-90 pure β-ray emitting nuclides. There is also a strong demand for leakage monitoring technology using pure β-ray nuclides as an index in the presence of γ-ray emitting nuclides.
放射線を計測する放射線検出器には、従来から電離箱、ＧＭ（ガイガーミュラー）計数管、シンチレーション検出器、半導体検出器等がエリアモニタ、プロセスモニタ、サーベイメータ等の線量モニタとして広く利用されている。また、蛍光ガラス線量計、熱ルミネセンス線量計、光刺激ルミネセンス線量計が個人被ばく管理やイメージングプレートとして利用されている。これらの線量モニタ、個人線量計およびイメージングプレートは原子力施設、放射性同位元素を使用する医療施設、研究用加速器施設等で主に利用されている。 Conventionally, ionization chambers, GM (Geiger-Muller) counters, scintillation detectors, semiconductor detectors and the like have been widely used as radiation monitors for measuring radiation, such as area monitors, process monitors, survey meters, and the like. In addition, fluorescent glass dosimeters, thermoluminescence dosimeters, and photostimulated luminescence dosimeters are used as personal exposure management and imaging plates. These dose monitors, personal dosimeters, and imaging plates are mainly used in nuclear facilities, medical facilities that use radioisotopes, research accelerator facilities, and the like.
従来の線量モニタの測定方法は、上述した検出器に数１０Ｖから数１,０００Ｖの印加電圧を供給し、放射線の入射で発生する電気信号を検出器から同軸ケーブル等を介して後段の計測回路で分析することが一般的である。一例として、原子力施設で利用されている線量モニタに適用されている検出器はシリコン半導体検出器、ＮａＩ（Ｔｌ）シンチレーション検出器、Ｇｅ検出器、電離箱であり、いずれも検出部への通電が必要である。検出部への電源供給が不要な放射線計測手段として、光ファイバを利用した線量モニタがある。構成は光ファイバの先端にシンチレーション素子を接続し、光ファイバを介して後段の光検出器で電気信号に変換、分析するものである。 In the conventional dose monitor measurement method, an applied voltage of several tens of volts to several thousand volts is supplied to the above-described detector, and an electrical signal generated by the incidence of radiation is transmitted from the detector to the subsequent measurement circuit via a coaxial cable or the like. It is common to analyze with. As an example, detectors applied to dose monitors used in nuclear facilities are silicon semiconductor detectors, NaI (Tl) scintillation detectors, Ge detectors, and ionization chambers, all of which energize the detector. is necessary. There is a dose monitor using an optical fiber as a radiation measurement means that does not require power supply to the detection unit. The configuration is such that a scintillation element is connected to the tip of the optical fiber, and it is converted into an electrical signal by a subsequent photodetector through the optical fiber and analyzed.
しかし、いずれの方式も、上述の放射性汚染水漏洩監視に対しては監視点数の多さからコスト高になり、採用に至っていない。 However, none of these methods has been adopted for the above-described monitoring of radioactive polluted water leakage due to the large number of monitoring points.
このような施設環境で光ファイバを利用した線量モニタを実現するには、漏洩水中の放射線を効率よく計測する装置およびその方法が必要である。 In order to realize a dose monitor using an optical fiber in such a facility environment, an apparatus and method for efficiently measuring radiation in leaking water are required.
特許文献１は配管及び弁を含む計測対象物に敷設された光ファイバ内にパルス光を入射し、その後方散乱光の強度を連続的に計測する手段により漏洩水や漏洩蒸気による温度変化から漏洩水を検出することを特徴とする。 Patent Document 1 leaks from temperature changes caused by leaked water or leaked steam by means of means for continuously measuring the intensity of the backscattered light by entering pulsed light into an optical fiber laid on an object to be measured including piping and valves. It is characterized by detecting water.
特許文献２はＯＳＬ素子を光ファイバの先端に接続し、任意のタイミングでレーザー光源による刺激光を照射することで、ＯＳＬ由来の輝尽光を発生させ、後段の光検出器でその光を計測することを特徴とする。 In Patent Document 2, an OSL element is connected to the tip of an optical fiber, and stimulated light from a laser light source is irradiated at an arbitrary timing to generate stimulated light derived from OSL, and the light is measured by a subsequent photodetector. It is characterized by doing.
上記放射性汚染水処理設備からの漏洩を監視するモニタリングシステムを実用化するには、数１,０００以上の超多点監視点で、漏洩水中の純β線放出核種をγ線放出核種が混在する中で効率よく計測する装置およびその監視システムを低コストで実現することが必要である。 In order to put into practical use a monitoring system that monitors leakage from the above-mentioned radioactively contaminated water treatment facilities, pure β-ray emission nuclides in leakage water are mixed with γ-ray emission nuclides at super-multiple monitoring points of several thousand or more. In particular, it is necessary to realize a device that efficiently measures and a monitoring system thereof at low cost.
特許文献１では配管及び弁を含む測定対象に光ファイバを設け、光ファイバ内にパルス光を入射させ、その後方散乱光の強度を連続的に計測し漏水による温度変化から漏洩検知を行う。しかし、漏洩水量が少ない場合は温度変化も小さく、微小漏洩を早期に監視することは困難である。また、洩水を含む放射性物質の測定およびそれらを効率よく計測することも困難である。 In Patent Document 1, an optical fiber is provided on a measurement object including a pipe and a valve, pulse light is incident on the optical fiber, the intensity of the backscattered light is continuously measured, and leakage detection is performed from a temperature change due to water leakage. However, when the amount of leaked water is small, the temperature change is small and it is difficult to monitor minute leaks at an early stage. It is also difficult to measure radioactive substances including leaked water and to measure them efficiently.
特許文献２では放射性物質に対してＯＳＬ光ファイバ型多点放射線計測技術を採用した放射線モニタリングシステムの基本構成を示している。しかし、漏洩水中の純β線放出核種をγ線放出核種が混在する中で効率よく計測するための装置構成に関する記載は一切無い。 Patent Document 2 shows a basic configuration of a radiation monitoring system that employs an OSL optical fiber type multipoint radiation measurement technique for a radioactive substance. However, there is no description about the apparatus configuration for efficiently measuring pure β-ray emission nuclides in leaked water in the presence of γ-ray emission nuclides.
上記放射性汚染水処理設備からの漏洩を監視するモニタリングシステムは、漏洩水中の純β線放出核種をγ線放出核種が混在する中で効率よく計測する技術が課題となる。また、放射性物質回収タンクや数kmに亘る配管群は複雑な構造部が多いため、狭隘部の超多点計測点を低コストで容易に実現する必要がある。また、室外設置のため雨水等に対する耐環境性も大きな課題となる。 The monitoring system for monitoring leakage from the radioactively contaminated water treatment facility has a problem of a technique for efficiently measuring pure β-ray emission nuclides in the leakage water in the presence of γ-ray emission nuclides. In addition, since the radioactive substance recovery tank and the piping group extending over several kilometers have many complicated structural parts, it is necessary to easily realize the super multi-point measuring point in the narrow part at a low cost. In addition, since it is installed outdoors, environmental resistance against rainwater and the like becomes a major issue.
本発明の目的は、上記の課題を解決する放射性汚染水処理設備からの漏洩を監視するモニタリングシステムとそのモニタリング方法を提供することにある。 The objective of this invention is providing the monitoring system which monitors the leakage from the radioactive contamination water treatment facility which solves said subject, and its monitoring method.
上述した目的を達成する請求項１の発明の漏洩水モニタリングシステムは、ＯＳＬ素子を含む放射線検出部を光ファイバの一端に接続し、前記ＯＳＬ素子に刺激光を照射する光源を前記光ファイバの他端に接続し、前記放射線検出部と、前記光源と、前記ＯＳＬ素子から放出するＯＳＬ光を受光分析する計測部とを光分岐ファイバ（フォトカップラ）で接続し、前記ＯＳＬ光の受光分析結果から前記放射線検出部の積算放射線量を解析表示するＯＳＬ光ファイバ型多点モニタリング装置において、前記放射線検出部を、放射性物質を含む水が漏洩する複数の漏洩箇所に対応付けて、前記漏洩する水を受ける漏洩水受け皿と共に設けることで、前記漏洩水受け皿で受けた放射性漏洩水から発生した放射線を検出するように構成されることを特徴とするものである。 The leakage water monitoring system according to the first aspect of the present invention that achieves the above-described object is characterized in that a radiation detection unit including an OSL element is connected to one end of an optical fiber, and a light source that irradiates the OSL element with stimulation light is used in addition to the optical fiber. Connected to the end, the radiation detection unit, the light source, and a measurement unit that receives and analyzes the OSL light emitted from the OSL element are connected by an optical branching fiber (photocoupler), and the result of the light reception analysis of the OSL light In the OSL optical fiber type multi-point monitoring device that analyzes and displays the accumulated radiation dose of the radiation detection unit, the radiation detection unit is associated with a plurality of leaking locations where water containing radioactive substances leaks, and the leaking water is It is configured to detect radiation generated from radioactive leaked water received by the leaked water tray by being provided together with the leaked water tray. It is intended to.
請求項２の発明の漏洩水モニタリングシステムは、上記放射線検出部が放射性物質を含む漏洩水受け皿の漏洩水に対し、漏洩水表面あるいは漏洩水表面との間に空間を持って配置する構造に設置すること特徴とするものである。 The leakage water monitoring system according to the invention of claim 2 is installed in a structure in which the radiation detection unit is disposed with a space between the leakage water surface or the leakage water surface with respect to the leakage water of the leakage water tray containing the radioactive substance. It is a characteristic to do.
請求項３の発明の漏洩水モニタリングシステムは、測定する放射線がβ線であることを特徴とするものである。 The leakage water monitoring system of the invention of claim 3 is characterized in that the radiation to be measured is β rays.
請求項４の発明の汚染水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿の内表面を、漏洩水が伝い流れする構造の受け皿とその上部に放射線検出部を設けることを特徴とするものである。 According to a fourth aspect of the present invention, there is provided a contaminated water monitoring system comprising: a receiving tray having a structure in which leaked water flows along the inner surface of the receiving tray of the leaked water containing the radioactive substance; and a radiation detection unit provided thereon. It is.
請求項５の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿の内表面に、漏洩水が伝い流れするガイドを設けた漏洩水受け皿を設けることを特徴とするものである。 The leakage water monitoring system of the invention of claim 5 is characterized in that a leakage water receiving tray provided with a guide through which leakage water flows is provided on the inner surface of the leakage water receiving tray containing the radioactive substance.
請求項６の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の上部に放射線検出部を設けることを特徴とするものである。 According to a sixth aspect of the present invention, there is provided a leakage water monitoring system, wherein the leakage water containing the radioactive substance is provided in a plate-like structure, and a radiation detector is provided on the upper portion of the plate-like tray.
請求項７の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の下部に放射線検出部を設けることを特徴とするものである。 According to a seventh aspect of the present invention, there is provided a leaked water monitoring system characterized in that a receiving tray for leaking water containing the radioactive substance is provided in a flat plate structure, and a radiation detector is provided at a lower portion of the flat plate receiving tray.
請求項８の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の下部から一定の空間持って放射線検出部を設けることを特徴とするものである。 The leaked water monitoring system of the invention of claim 8 is characterized in that a receiving tray for leaking water containing the radioactive substance is provided in a flat plate-like structure, and a radiation detector is provided with a certain space from the lower portion of the flat plate receiving pan. To do.
請求項９の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の表面に漏洩水を一定量溜める機構を設けることを特徴とするものである。 The leaked water monitoring system of the invention of claim 9 is characterized in that a receiving tray for leaking water containing the radioactive substance is provided in a flat plate-like structure, and a mechanism for collecting a certain amount of leaking water is provided on the surface of the flat receiving plate. Is.
請求項１０の発明の漏洩水モニタリングシステムは、上記放射性物質を含む漏洩水の放射線検出部を保護膜で覆う構造で漏洩水中に設けることを特徴とするものである。 The leakage water monitoring system of the invention of claim 10 is characterized in that it is provided in the leakage water with a structure in which the radiation detection part of the leakage water containing the radioactive substance is covered with a protective film.
請求項１１の発明の漏洩水モニタリングシステムは、純β線放出核種の妨害となるＣｓ−１３７等のγ線放出核種のバックグランド放射線と弁別するため、β線を遮蔽する放射線フィルタ付とフィルタなしの複数の放射線検出部を設け、両差の測定差分値から純β線放出核種量を定量することを特徴とするものである。 According to the eleventh aspect of the present invention, the leakage water monitoring system is provided with a radiation filter for shielding β rays and without a filter so as to discriminate from background radiation of γ-ray emitting nuclides such as Cs-137 which interfere with pure β-ray emitting nuclides. A plurality of radiation detection units are provided, and the amount of pure β-ray emission nuclide is quantified from the measured difference value of both differences.
請求項１２の発明の漏洩水モニタリングシステムは、放射性物質を含む漏洩水を堰等に導引し、上記堰の一箇所あるいは複数の点に放射線検出部を設けることを特徴とするものである。 A leakage water monitoring system according to a twelfth aspect of the invention is characterized in that leakage water containing a radioactive substance is guided to a weir or the like, and a radiation detection unit is provided at one or a plurality of points of the weir.
請求項１３の発明の漏洩水モニタリングシステムは、放射性汚染水処理タンク下部あるいは配管下部から漏洩水を一箇所に導引する漏洩水集中ガイドを設けることを特徴とするものである。 According to a thirteenth aspect of the present invention, there is provided a leaked water monitoring system comprising a leaked water concentration guide for guiding leaked water from a lower part of a radioactively contaminated water treatment tank or a lower part of a pipe.
請求項１４の発明の漏洩水モニタリングシステムは、ＯＳＬ光ファイバ型多点モニタリング計測の多点切り替えに光スイッチを採用することを特徴とするものである。 According to a fourteenth aspect of the present invention, there is provided a leakage water monitoring system employing an optical switch for multipoint switching of OSL optical fiber type multipoint monitoring measurement.
請求項１５の発明の汚染水モニタリングシステムは、多点計測を実現するため、光スイッチに光クロスコネクタを設けることを特徴とするものである。 The contaminated water monitoring system of the invention of claim 15 is characterized in that an optical cross connector is provided in the optical switch in order to realize multipoint measurement.
請求項１６の発明の汚染水モニタリングシステムは、多点計測を実現するため、光スイッチにガルバノスキャンスイッチを設けることを特徴とするものである。 The polluted water monitoring system of the invention of claim 16 is characterized in that a galvano scan switch is provided in the optical switch in order to realize multipoint measurement.
請求項１７の発明の汚染水モニタリングシステムは、請求項１で示したＯＳＬ光ファイバ型多点モニタリング装置で収集した情報を元に、漏洩場所、線量、線量率等を容易に監視できる監視盤を設けることを特徴とするものである。 The polluted water monitoring system according to the invention of claim 17 is a monitoring panel that can easily monitor the leak location, dose, dose rate, etc. based on the information collected by the OSL optical fiber multi-point monitoring device shown in claim 1. It is characterized by providing.
請求項１８の発明の漏洩水モニタリングシステムは、請求項１〜１７のいずれかを組み合わせることを特徴とするものである。 The leaked water monitoring system of the invention of claim 18 is characterized by combining any one of claims 1 to 17.
請求項１の発明の漏洩水モニタリングシステムによれば、放射線検出部を、放射性物質を含む複数の漏洩水検出箇所に漏洩水受け皿とともに設けることによって、漏洩場所を迅速に決定することが可能となり、高精度かつ高感度の漏洩水モニタリングシステムが可能となる。さらに、ＯＳＬ光ファイバ型多点モニタリング技術の採用により、耐環境性に優れた低コストの超多点の監視箇所の漏洩水モニタリングシステムを実現できる。 According to the leakage water monitoring system of the invention of claim 1, it is possible to quickly determine the leakage location by providing the radiation detection unit together with the leakage water receiving tray at a plurality of leakage water detection locations including radioactive substances, A highly accurate and highly sensitive leakage water monitoring system becomes possible. Furthermore, by adopting the OSL optical fiber type multi-point monitoring technology, it is possible to realize a leakage water monitoring system at a super-multi-point monitoring location with excellent environmental resistance and low cost.
請求項２の発明の漏洩水モニタリングシステムによれば、放射線検出部を、放射性物質を含む漏洩水の表面あるいは空間を持って配置する構造のため、漏洩水中に放射線検出部を設ける構造に比べ、β線放出核種のβ線の漏洩水中の減衰がなく、１０倍以上の高感度のモニタリングを実現できる。 According to the leakage water monitoring system of the invention of claim 2, because the radiation detection unit is disposed with the surface or space of the leakage water containing the radioactive substance, compared to the structure in which the radiation detection unit is provided in the leakage water, There is no attenuation of β-rays of β-ray emitting nuclides in the leakage water, and it is possible to realize monitoring with a sensitivity of 10 times or more.
請求項３の発明の漏洩水モニタリングシステムによれば、漏洩水中のβ線放出核種を漏洩の指標核種とすることによって、バックグラウンドとなるγ線と弁別した、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the invention of claim 3, highly sensitive and highly accurate leakage water monitoring is performed by discriminating from the background γ rays by using the β-ray emission nuclide in the leakage water as an indicator nuclide for leakage. Can be realized.
請求項４の発明の漏洩水モニタリングシステムによれば、上記放射性物質を含む漏洩水の受け皿の内表面を、漏洩水が伝い流れする構造の受け皿とその上部に放射線検出部を設けることによって、放射線検出部が漏洩水を見込む測定面積が大幅に向上し、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the invention of claim 4, the inner surface of the leakage water receiving tray containing the radioactive substance is provided with a radiation detector having a structure in which leakage water flows and the upper portion thereof is provided with radiation. The detection area where the detector expects leaked water is greatly improved, and highly sensitive and accurate leaked water monitoring can be realized.
請求項５の発明の漏洩水モニタリングシステムによれば、漏洩水の受け皿の内表面を、漏洩水が伝い流れする構造の受け皿とその上部に放射線検出部を設けることによって、放射線検出部が漏洩水を見込む測定面積や体積が大幅に向上し、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leaked water monitoring system of the fifth aspect of the invention, the radiation detecting unit is provided with the radiation detecting unit provided on the inner surface of the receiving plate of the leaked water and the radiation detecting unit on the receiving plate having a structure in which the leaked water is transmitted. The measurement area and volume expected to increase significantly, and highly sensitive and highly accurate leakage water monitoring can be realized.
請求項６の発明の漏洩水モニタリングシステムによれば、平板状の漏洩水受け皿を設置し、その上部に放射線量を検出する放射線検出部を設ける構造にすることによって、漏洩水が常に流れ、受け皿に放射線を遮蔽する異物が堆積するのを防ぎ、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the sixth aspect of the present invention, by installing a flat plate-like leakage water receiving tray and providing a radiation detection unit for detecting the radiation dose at the upper part thereof, the leakage water always flows, It is possible to prevent foreign matter that shields radiation from accumulating on the surface, and to realize highly sensitive and highly accurate leakage water monitoring.
請求項７の発明の漏洩水モニタリングシステムによれば、平板状の漏洩水受け皿を設置し、その下部に放射線量を検出する放射線検出部を設けることで、検出器の簡易化、漏洩水が常に流れ、受け皿に放射線を遮蔽する異物が堆積するのを防ぎ、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leaked water monitoring system of the invention of claim 7, by installing a flat plate-shaped leaked water tray and providing a radiation detection unit for detecting the radiation dose at the lower part, simplification of the detector, leaked water is always This prevents the accumulation of foreign matter that shields radiation from the flow and pan, and realizes highly sensitive and highly accurate leakage water monitoring.
請求項８の発明の漏洩水モニタリングシステムによれば、平板状の漏洩水受け皿を設置し、その下部から距離を置いたところに放射線検出部を設けることで、放射線検出部の簡素化と漏洩水が常に流れ、受け皿に放射線を遮蔽する異物が堆積するのを防ぎ、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the eighth aspect of the invention, a flat plate-like leakage water tray is installed, and the radiation detection unit is provided at a distance from the lower part thereof, thereby simplifying the radiation detection unit and leaking water. Flows constantly, preventing the accumulation of foreign matter that shields radiation on the pan, and can realize highly sensitive and highly accurate leakage water monitoring.
請求項９の発明の漏洩水モニタリングシステムによれば、平板状の漏洩水受け皿および漏洩水を一定量溜める機構を設置し、その下部から距離を置いたところに放射線を検出する放射線検出部を設けることで多くの漏洩水からの放射線を検出することが可能となり、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the ninth aspect of the invention, a flat plate-like leakage water tray and a mechanism for collecting a certain amount of leakage water are installed, and a radiation detection unit for detecting radiation is provided at a distance from the lower part thereof. This makes it possible to detect radiation from a large amount of leaked water and realize highly sensitive and highly accurate leaked water monitoring.
請求項１０の発明の漏洩水モニタリングシステムによれば、放射線検出部を保護膜で覆い、漏洩水中に非接触で放射線検出部を設けることが可能となり、高感度の漏洩水モニタリングを実現できる。 According to the leaked water monitoring system of the tenth aspect of the present invention, it is possible to cover the radiation detecting unit with the protective film and provide the radiation detecting unit in a non-contact manner in the leaked water, thereby realizing highly sensitive leaked water monitoring.
請求項１１の発明の漏洩水モニタリングシステムによれば、純β線放出核種の妨害となるＣｓ−１３７等のγ線放出核種のバックグランド放射線との弁別を高精度で実現できるため、高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the invention of claim 11, since it is possible to realize the discrimination from the background radiation of the γ-ray emitting nuclide such as Cs-137 which becomes the interference of the pure β-ray emitting nuclide with high accuracy, Leaked water monitoring can be realized.
請求項１２の発明の漏洩水モニタリングシステムによれば、放射性物質を含む漏洩水を堰等に導引し、上記堰の一箇所あるいは複数の点に放射線検出部を設けることによって、低コストで簡素な漏洩水モニタリングを実現できる。 According to the leaked water monitoring system of the twelfth aspect of the present invention, the leaked water containing a radioactive substance is guided to a weir or the like, and a radiation detection unit is provided at one or a plurality of points of the weir, so that it is simple and inexpensive. Leakage water monitoring can be realized.
請求項１３の発明の漏洩水モニタリングシステムによれば、放射性汚染水処理タンク下部あるいは配管下部から漏洩水を一箇所に導引する漏洩水集中ガイドを設けることによって、高感度・高精度の漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the thirteenth aspect of the present invention, by providing the leakage water concentration guide that guides leakage water from the lower part of the radioactively contaminated water treatment tank or the lower part of the pipe to the one place, highly sensitive and highly accurate leakage water is provided. Monitoring can be realized.
請求項１４の発明の漏洩水モニタリングシステムによれば、光スイッチを備えることで、容易に放射線検出部の多チャンネル化が実現でき、柔軟な多チャンネルモニタリングシステムを構築できる。 According to the leakage water monitoring system of the fourteenth aspect of the present invention, the provision of the optical switch makes it possible to easily realize the multi-channel of the radiation detection unit and to construct a flexible multi-channel monitoring system.
請求項１５の発明の漏洩水モニタリングシステムによれば、光スイッチに光クロスコネクタを備えることで、低コストで容易に放射線検出部の多チャンネル化が実現でき、１台の計測装置及び解析装置で複数部分の線量及び線量率計測を実現できる。 According to the leakage water monitoring system of the fifteenth aspect of the present invention, by providing the optical switch with the optical cross connector, it is possible to easily realize multi-channels of the radiation detection unit at low cost, with one measuring device and analyzing device. Multiple part dose and dose rate measurements can be realized.
請求項１６の発明の漏洩水モニタリングシステムによれば、光スイッチにガルバノスキャンを備えることで、低コストで容易に放射線検出部の多チャンネル化が実現でき、１台の計測装置及び解析装置で複数部分の線量及び線量率計測を実現できる。 According to the leakage water monitoring system of the sixteenth aspect of the present invention, by providing the optical switch with a galvano scan, it is possible to easily realize multi-channels of the radiation detection unit at low cost, and a plurality of measurement devices and analysis devices can be used. Partial dose and dose rate measurement can be realized.
請求項１７の発明の漏洩水モニタリングシステムは、上述のＯＳＬ光ファイバ型多点モニタリング装置で収集した情報を元に、漏洩場所、線量、線量率等を容易に監視できる監視盤を設けることによって、より実用的なモニタリングシステムを実現できる。 The leakage water monitoring system of the invention of claim 17 is based on the information collected by the OSL optical fiber type multi-point monitoring device described above, by providing a monitoring panel that can easily monitor the leakage location, dose, dose rate, etc. A more practical monitoring system can be realized.
請求項１８の発明の漏洩水モニタリングシステムによれば、請求項１〜請求項１７までの何れかを効果的に組み合わせることによって、多くの測定環境に沿った漏洩水モニタリングを実現できる。 According to the leakage water monitoring system of the invention of claim 18, leakage water monitoring along many measurement environments can be realized by effectively combining any of claims 1 to 17.
以上のとおり、本発明は従来技術と比較して顕著な効果を奏する。 As described above, the present invention has a remarkable effect as compared with the prior art.
本発明は、発明者らが光ファイバを利用した線量モニタにおいて漏洩水中の放射線を効率よく計測する装置およびその方法について、種々検討して得た新たな知見に基づいてなされたものである。 The present invention has been made on the basis of new knowledge obtained by various studies on an apparatus and a method for efficiently measuring radiation in leaked water in a dose monitor using optical fibers.
この知見では、漏洩水を検知するため漏洩水から非接触に検出部を設けることで、漏洩水に含まれる放射性物質の放射線の飛程を伸ばし有感面積を向上させることができ、さらに漏水の有感面積を向上させる構造を有する漏洩水受け皿を設置することで、漏洩水に含まれる微量放射性物質の測定ができる。また、放射線検出部と複数個のフィルタ付放射線検出部を備えることで、バックグラウンドの放射線と測定対象の放射線を弁別することができるため、広範囲に漏洩水を検知しなければならない各種施設においても、検出部への電源が不要で、高精度かつ高感度の線量及び線量率測定を実現できる、というものである。 In this knowledge, in order to detect leaked water, by providing a non-contact detector from the leaked water, the radiation range of the radioactive material contained in the leaked water can be extended and the sensitive area can be improved. By installing a leaked water tray having a structure that improves the sensitive area, it is possible to measure a trace amount of radioactive material contained in the leaked water. In addition, by providing a radiation detector and a plurality of filter-equipped radiation detectors, it is possible to discriminate between background radiation and radiation to be measured. The power supply to the detection unit is unnecessary, and highly accurate and highly sensitive dose and dose rate measurement can be realized.
以下、本発明に係る漏洩水モニタリングシステムの好適な実施例を、図面を参照して、新たな知見の内容を具体的に説明する。 Hereinafter, preferred embodiments of the leakage water monitoring system according to the present invention will be described in detail with reference to the drawings.
本発明の好適な一実施例である実施例の汚染水モニタリングシステムを、図１〜図１４を用いて説明する。実施例１の漏洩水モニタリングシステムは放射線検出部１、漏水受け皿２、検出システム３、光ファイバ４、から構成される。放射線検出部１は光ファイバ４を介して検出システム３に接続される。漏洩水受け皿２は放射線検出部１の下部に設けられ滞留タンク５や亀裂７からの漏洩水６を受ける構成とされる。漏洩水６に含まれる放射性物質の一例としてＣｓ−１３４、Ｃｓ−１３６、Ｃｓ−１３７、Ｉ−１３１、Ｉ−１３３、Ｉ−１３５、Ｃｏ−５７、Ｃｏ−５８、Ｃｏ−６０、Ｍｎ−５４、Ｍｎ−５６、Ｎａ−２４、Ｒｕ−１０３、Ｂａ−１４０、Ｌａ−１４０、Ｓｂ−１２５、Ｒｕ−１０６、Ｃｒ−５１、Ｙ−９１、Ｕ−２３７、Ｓｒ−９０／Ｙ−９０、Ｅｕ−１５４等がある。 A contaminated water monitoring system according to an embodiment which is a preferred embodiment of the present invention will be described with reference to FIGS. The leakage water monitoring system according to the first embodiment includes a radiation detection unit 1, a water leakage tray 2, a detection system 3, and an optical fiber 4. The radiation detection unit 1 is connected to a detection system 3 via an optical fiber 4. The leaked water tray 2 is provided at the lower part of the radiation detection unit 1 and receives the leaked water 6 from the staying tank 5 and the crack 7. Examples of radioactive substances contained in the leaked water 6 include Cs-134, Cs-136, Cs-137, I-131, I-133, I-135, Co-57, Co-58, Co-60, and Mn-54. , Mn-56, Na-24, Ru-103, Ba-140, La-140, Sb-125, Ru-106, Cr-51, Y-91, U-237, Sr-90 / Y-90, Eu -154 etc.
放射線検出部１は漏洩水６を受けた漏洩水受け皿２から放射される放射線を検知する機能を有する。 The radiation detection unit 1 has a function of detecting radiation radiated from the leaked water tray 2 that has received the leaked water 6.
図２に汚染水モニタリングシステムの構成を示す。放射線検出部１、コネクタ１４、光ファイバ４、光スイッチ７、フォトカプラ８、光源９、光制御装置１０、光発生用タイミングケーブル１２、制御・データ収集装置１３から構成される。放射線検出部１はコネクタ１４および光ファイバ４を介して光スイッチ７に接続される。光スイッチ７はフォトカプラ８を介して光源９、光制御装置１０、光検出器１１および制御データ収集装置１３に接続される。 Fig. 2 shows the configuration of the contaminated water monitoring system. The radiation detection unit 1, the connector 14, the optical fiber 4, the optical switch 7, the photocoupler 8, the light source 9, the light control device 10, the light generation timing cable 12, and the control / data collection device 13 are configured. The radiation detection unit 1 is connected to the optical switch 7 via the connector 14 and the optical fiber 4. The optical switch 7 is connected to a light source 9, a light control device 10, a photodetector 11, and a control data collection device 13 through a photocoupler 8.
放射線検出部１の内部には放射線量を積算する光刺激ルミネセンス（ＯＳＬ）素子２８が設置されている（後述の図１１左図に示す）。ここでＯＳＬ素子の一例を挙げる。代表的なＯＳＬ素子はイメージングプレートで使用されるＢａＦＢｒ：Ｅｕ、個人線量計として使用されているＡｌ2Ｏ3：Ｃがある。他のＯＳＬ素子としてＢａＦｌ：Ｅｕ、ＮａＣ：Ｃｕ、ＫＣｌ：Ｃ、ＫＢｒ：Ｅｕ、ＲｂＢｒ：Ｔｌ、ＳｒＳ：Ｅｕ，Ｓｍ、ＣｓＳ：Ｅｕ，Ｓｍ、ＭｇＳ：Ｅｕ，Ｓｍ、ＭｇＳ：Ｃｅ，Ｓｍ、ＭｇＯ：Ｆｅ、Ｚｎ2ＳｉＯ4：Ｍｎ、Ｂａ6(ＰＯ4)3：Ｅｕ、２５Ｎａ2Ｏ、７５Ｂ2Ｏ3：Ｅｕ等が存在する。光ファイバ４を介して光検出器１１から発生した刺激光がＯＳＬ素子に照射されることで、ＯＳＬ素子からＯＳＬ光２９が発生する。ＯＳＬ光２９は光ファイバ４の先端に入射することで、フォトカプラ８を介して光検出器１１に伝送される。 A light-stimulated luminescence (OSL) element 28 for integrating the radiation dose is installed inside the radiation detection unit 1 (shown in the left diagram of FIG. 11 described later). Here, an example of an OSL element is given. Typical OSL elements include BaFBr: Eu used in an imaging plate and Al 2 O 3 : C used as a personal dosimeter. As other OSL elements, BaFl: Eu, NaC: Cu, KCl: C, KBr: Eu, RbBr: Tl, SrS: Eu, Sm, CsS: Eu, Sm, MgS: Eu, Sm, MgS: Ce, Sm, MgO : Fe, Zn 2 SiO 4 : Mn, Ba 6 (PO 4 ) 3 : Eu, 25Na 2 O, 75B 2 O 3 : Eu, etc. The OSL light 29 is generated from the OSL element by irradiating the OSL element with the stimulation light generated from the photodetector 11 through the optical fiber 4. The OSL light 29 enters the tip of the optical fiber 4 and is transmitted to the photodetector 11 through the photocoupler 8.
光源９はＯＳＬ光２９を発生させる領域の波長を発生するものを適用する。光源９は光制御装置１０を用いて光の発生を制御する。ＯＳＬ光２９を刺激する光は連続およびパルスいずれでも適用可能である。光制御装置１０には光発生と同等のタイミングで外部に出力する機能を備え、その出力は光発生用タイミングケーブル１２を介して制御・データ収集装置１３に伝送される。 As the light source 9, a light source that generates a wavelength in a region where the OSL light 29 is generated is applied. The light source 9 controls the generation of light using the light control device 10. The light that stimulates the OSL light 29 can be applied continuously or pulsed. The light control device 10 has a function of outputting to the outside at the same timing as the generation of light, and the output is transmitted to the control / data collection device 13 via the light generation timing cable 12.
光検出器１１は光カプラ８を介して伝送されるＯＳＬ光２９、光源９由来の光源バックグラウンドおよび環境バックグラウンドを検出する。光検出器１１の代表例は光電子増倍管、半導体フォトダイオードがある。 The photodetector 11 detects the OSL light 29 transmitted through the optical coupler 8, the light source background derived from the light source 9, and the environmental background. Typical examples of the photodetector 11 include a photomultiplier tube and a semiconductor photodiode.
制御・データ収集装置１３は光検出器出力の時刻及び波高を計測する機能を有する。光検出器１１に光が入射すると、光検出器出力であるパルス出力が光検出器１１から後段の制御・データ収集装置１３で計測される。パルス出力の波高値はベースラインを基準とした電圧レベルであり、パルス毎に波高値が計測される。 The control / data collection device 13 has a function of measuring the time and wave height of the photodetector output. When light is incident on the photodetector 11, a pulse output that is an output of the photodetector is measured from the photodetector 11 by the control / data collection device 13 at the subsequent stage. The peak value of the pulse output is a voltage level based on the baseline, and the peak value is measured for each pulse.
本発明のほかの実施例である実施例２の漏洩水モニタリングシステムについ説明する。
実施例２では放射線検出部１を漏洩水６に対して非接触に設けることで測定面積を上げるものである。
The leakage water monitoring system according to the second embodiment which is another embodiment of the present invention will be described.
In Example 2, the measurement area is increased by providing the radiation detection unit 1 in a non-contact manner with respect to the leakage water 6.
図３にβ線検出感度向上を図る検出部の基本構造を示す。純β線源であるＳｒ−９０／Ｙ−９０を測定対象とした場合の一例を示す。水没方式では放射線検出部１が漏洩水に対して接触するように設けることで漏洩水中のβ線の水中での飛程約１cmの範囲で放射線を計測することができる。空中方式では放射線検出部１を漏洩水に対して非接触に設けることで漏洩水中のβ線の空中での飛程約１ｍの範囲で放射線を計測することで水没式と比べ測定面積の向上を実現できる。なお、本例はＳｒ−９０／Ｙ−９０を測定対象とした場合の一例を示したが、測定対象核種から放射するβ線の飛程によって構造は最適化されるため、図３に限定するものではない。 FIG. 3 shows a basic structure of a detection unit for improving the β-ray detection sensitivity. An example in which Sr-90 / Y-90, which is a pure β-ray source, is used as a measurement target is shown. In the submersion method, radiation can be measured within a range of about 1 cm in the range of β rays in the leaked water by providing the radiation detection unit 1 so as to contact the leaked water. In the aerial method, the radiation detection unit 1 is provided in a non-contact manner with respect to the leaked water, and the measurement area is improved compared to the submerged type by measuring the radiation within a range of about 1 m in the range of β rays in the leaked water. realizable. Although this example shows an example in which Sr-90 / Y-90 is a measurement target, the structure is optimized depending on the range of β rays radiated from the measurement target nuclide. It is not a thing.
本発明のほかの実施例である実施例３の漏洩水モニタリングシステムについて説明する。実施例３では放射性物質を含む漏洩水６の検出感度向上のため、漏洩水中のβ線を計測することによりバックグラウンドにあるγ線と弁別し漏洩水検知を実現できる。 The leakage water monitoring system of Example 3 which is another Example of this invention is demonstrated. In Example 3, in order to improve the detection sensitivity of the leaked water 6 containing the radioactive substance, the leaked water can be detected by discriminating from the γ-rays in the background by measuring β-rays in the leaked water.
本発明のほかの実施例である実施例４の漏洩水モニタリングシステムについて説明する。実施例４では漏洩箇所に漏洩水受け皿を設け、その中央に放射線検出部１を設けることで漏洩水６の測定面積を向上させ、高感度測定を実現できる。 The leakage water monitoring system of Example 4 which is another Example of this invention is demonstrated. In Example 4, a leakage water receiving tray is provided at the leakage location, and the radiation detection unit 1 is provided at the center thereof, thereby improving the measurement area of the leakage water 6 and realizing high-sensitivity measurement.
図４に検出部の変形例１を示す。検出部変形例１は放射線検出部１、半球型受け皿１９、ゴミ混入防止カバー１５、排水口１７を備える。本実施例を適用することで、配管１６等から漏洩水が半球型受け皿１９の壁面へ伝うことで、漏洩水６の測定面積があがることにより、漏洩水６からの放射線１８の高感度測定が実現できる。また、ゴミ混入防止カバー１５により放射線を遮蔽するゴミの混入を防ぎ、漏洩水６からの放射線１８の高感度測定が実現できる。 FIG. 4 shows a first modification of the detection unit. The detection unit modification 1 includes a radiation detection unit 1, a hemispherical tray 19, a dust mixing prevention cover 15, and a drain port 17. By applying the present embodiment, the leaked water is transmitted from the pipe 16 or the like to the wall surface of the hemispherical tray 19 and the measurement area of the leaked water 6 is increased, so that the high sensitivity measurement of the radiation 18 from the leaked water 6 can be performed. realizable. In addition, the dust mixing prevention cover 15 prevents the mixing of dust that shields the radiation, so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized.
本発明のほかの実施例である実施例５の漏洩水モニタリングシステムについて説明する。実施例５では実施例３と同様に漏洩箇所に漏水受け皿を設け、その中央に放射線検出部１を設けることで漏洩水６の測定面積を向上させ高感度測定をするものである。 The leakage water monitoring system of Example 5 which is another Example of this invention is demonstrated. In the fifth embodiment, as in the third embodiment, a leakage receiving tray is provided at the leakage location, and the radiation detection unit 1 is provided at the center thereof, thereby improving the measurement area of the leakage water 6 and performing high sensitivity measurement.
図５に検出部の変形例２を示す。検出部変形例２は放射線検出部１、半球型受け皿１９、漏洩水ガイド２０、ゴミ混入防止カバー１５、排水口１７を備える。本実施例を適用することで配管１６等から半球型受け皿１９の壁面をつたい、漏洩水ガイド２０により漏洩水を螺旋状にし、測定面積の向上を図ることで漏洩水６からの放射線１８の高感度測定が実現できる。 FIG. 5 shows a second modification of the detection unit. The detection unit modification 2 includes a radiation detection unit 1, a hemispherical tray 19, a leaked water guide 20, a dust mixing prevention cover 15, and a drain port 17. By applying the present embodiment, the wall of the hemispherical tray 19 is connected from the pipe 16 or the like, the leaked water is spiraled by the leaked water guide 20, and the measurement area is improved to improve the radiation area of the radiation 18 from the leaked water 6. High sensitivity measurement can be realized.
本発明のほかの実施例である実施例６の漏洩水モニタリングシステムについて説明する。実施例６では漏洩箇所に漏洩水受け皿を設け、その上部に放射線検出部１を設けることで、漏洩水６の測定面積を向上させ、高感度測定するものである。 The leakage water monitoring system of Example 6 which is another Example of this invention is demonstrated. In the sixth embodiment, the leakage water receiving tray is provided at the leakage location, and the radiation detection unit 1 is provided at the upper portion thereof, so that the measurement area of the leakage water 6 is improved and high sensitivity measurement is performed.
図６に検出部変形例３を示す。検出部変形例３は放射線検出部１、平型受け皿２１を備える。本実施例を適用することで漏洩水６が平型受け皿２１に広がり、漏洩水６の測定面積があがることで、漏洩水６からの放射線１８の高感度測定が実現できる。また、平型受け皿にすることにより、放射線を遮蔽するゴミが混入後も漏洩水により流され、ゴミ等による遮蔽による測定精度への影響が出ない構造となり高感度測定が実現できる。この実施例では平型受け皿２１を透過したβ線を測定する条件のため、前記平型受け皿２１がアルミニウム材料の場合、０.４mm厚、鉄材料の場合、０.１mm厚程度（Ｙ−９０の最大エネルギー２.７８MeVの最大飛程の約１／１０）が望ましい。 FIG. 6 shows a third modification of the detection unit. The detection unit modification 3 includes a radiation detection unit 1 and a flat tray 21. By applying this embodiment, the leaked water 6 spreads over the flat tray 21 and the measurement area of the leaked water 6 is increased, so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized. In addition, by using a flat tray, a structure that does not affect the measurement accuracy due to the shielding by dust and the like can be realized by the leaked water even after dust that shields radiation is mixed, and high sensitivity measurement can be realized. In this embodiment, because β-rays transmitted through the flat tray 21 are measured, when the flat tray 21 is made of an aluminum material, the thickness is about 0.4 mm. When the flat plate is made of an iron material, the thickness is about 0.1 mm (Y-90). About 1/10 of the maximum range of 2.78 MeV.
本発明のほかの実施例である実施例７の漏洩水モニタリングシステムについて説明する。実施例７では漏洩箇所に漏洩水受け皿を設け、その下部に放射線検出部１を設けることで、漏洩水６の測定面積を向上させ、高感度測定をするものである。 The leakage water monitoring system of Example 7 which is another Example of this invention is demonstrated. In Example 7, the leak water receiving tray is provided at the leak location, and the radiation detection unit 1 is provided at the lower portion thereof, thereby improving the measurement area of the leak water 6 and performing high sensitivity measurement.
図７に検出部変形例４を示す。検出部変形例４は放射線検出部１、平型受け皿２１を備える。本実施例を適用することで漏洩水６が平型受け皿２１に広がり、漏洩水６の測定面積があがることで、漏洩水６からの放射線１８の高感度測定が実現できる。また、放射線検出部１を平型受け皿２１の下部に設けることで、検出部の簡易構造化、簡易設置化、放射線を遮蔽するゴミの対処が容易に実現できる。 FIG. 7 shows a detection unit modification 4. The detection unit modification 4 includes a radiation detection unit 1 and a flat tray 21. By applying this embodiment, the leaked water 6 spreads over the flat tray 21 and the measurement area of the leaked water 6 is increased, so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized. Further, by providing the radiation detection unit 1 below the flat tray 21, it is possible to easily realize a simple structure, simple installation of the detection unit, and handling of dust that shields radiation.
本発明のほかの実施例である実施例８の漏洩水モニタリングシステムについて説明する。実施例８では漏洩箇所に漏洩水受け皿を設け、その下部に放射線検出部１を設けることで漏洩水６の測定面積を向上させ、高感度測定をするものである。 A leakage water monitoring system according to an eighth embodiment which is another embodiment of the present invention will be described. In Example 8, a leakage water receiving tray is provided at the leakage location, and the radiation detection unit 1 is provided at the lower portion thereof, thereby improving the measurement area of the leakage water 6 and performing high sensitivity measurement.
図８に検出部変形例５を示す。検出部変形例５は放射線検出部１、平型受け皿２１を備える。本実施例を適用することで漏洩水６が平型受け皿２１に広がり、漏洩水６の測定面積があがることで、漏洩水６からの放射線１８の高感度測定が実現できる。また、平型受け皿２１から放射線検出部１を一定距離離すことで、広範囲の漏洩水を検出可能にし、放射線検出感度向上を実現できる。 FIG. 8 shows a modification 5 of the detection unit. The detection unit modification 5 includes a radiation detection unit 1 and a flat tray 21. By applying this embodiment, the leaked water 6 spreads over the flat tray 21 and the measurement area of the leaked water 6 is increased, so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized. Further, by separating the radiation detection unit 1 from the flat tray 21 by a certain distance, it is possible to detect a wide range of leaked water and improve the radiation detection sensitivity.
本発明のほかの実施例である実施例９の漏洩水モニタリングシステムについて説明する。実施例９では漏洩箇所に漏洩水受け皿を設け、その下部に放射線検出部１を設けることで漏洩水６の測定面積を向上させ、高感度測定をするものである。 The leakage water monitoring system of Example 9 which is another Example of this invention is demonstrated. In the ninth embodiment, the leakage water receiving tray is provided at the leakage location, and the radiation detection unit 1 is provided at the lower portion thereof, thereby improving the measurement area of the leakage water 6 and performing high-sensitivity measurement.
図９に検出部変形例６を示す。検出部変形例６は放射線検出部１、平型受け皿２１、溜め機構２２を備える。本実施例を適用することで漏洩水６が平型受け皿２１に広がり、溜め機構２２により漏洩水６を滞留させることにより測定面積があがり、漏洩水６からの放射線１８の高感度測定が実現できる。 FIG. 9 shows a sixth modification of the detection unit. The detection unit modification 6 includes a radiation detection unit 1, a flat tray 21, and a reservoir mechanism 22. By applying the present embodiment, the leaked water 6 spreads over the flat tray 21 and the reservoir area 22 causes the measurement area to be increased by retaining the leaked water 6 so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized. .
本発明のほかの実施例である実施例１０の漏洩水モニタリングシステムについて説明する。実施例１０では漏洩箇所に漏洩水受け皿２４を設け、保護膜２３で覆った放射線検出部１を漏洩水６に接触または非接触にするように設置することで測定面積を向上させ、高感度測定をするものである。 The leakage water monitoring system of Example 10 which is another Example of this invention is demonstrated. In Example 10, a leakage water receiving tray 24 is provided at the leakage location, and the radiation detection unit 1 covered with the protective film 23 is installed so as to be in contact with or not in contact with the leakage water 6, thereby improving the measurement area and performing highly sensitive measurement. It is something to do.
図１０に水中計測検出部の変形例１を示す。水中計測検出器の変形例１は放射線検出部１、保護膜２３、受け皿２４を備える。本実施例を適用することで放射線検出部１を保護膜２３により漏洩水６から保護し測定面積を向上することで、漏洩水６からの放射線１８の高感度測定が実現できる。この実施例では保護膜２３を透過したβ線を測定する条件のため、前記保護膜２３がアルミニウム材料の場合、０.４mm厚、鉄材料の場合、０.１mm厚程度（Ｙ−９０の最大エネルギー２.７８MeVの最大飛程の約１／１０）が望ましい。 FIG. 10 shows a first modification of the underwater measurement detection unit. Modification 1 of the underwater measurement detector includes a radiation detection unit 1, a protective film 23, and a tray 24. By applying the present embodiment, the radiation detection unit 1 is protected from the leaked water 6 by the protective film 23 and the measurement area is improved, so that highly sensitive measurement of the radiation 18 from the leaked water 6 can be realized. In this embodiment, because β-rays transmitted through the protective film 23 are measured, when the protective film 23 is made of an aluminum material, the thickness is about 0.4 mm, and when the protective film 23 is made of an iron material, the thickness is about 0.1 mm (maximum of Y-90). An energy of about 1/10 of the maximum range of 2.78 MeV is desirable.
本発明のほかの実施例である実施例１１の漏洩水モニタリングシステムについて説明する。実施例１２で光ファイバ４から距離をおいた直下にＯＳＬ素子２８を設けた放射線検出部と光ファイバ４から距離を置いた直下にＯＳＬ素子２８を設けその下部にβ線等を遮蔽するフィルタ３０を設けることでバックグラウンドの放射線と測定対象の放射線を弁別するものである。 The leakage water monitoring system of Example 11 which is another Example of this invention is demonstrated. In the twelfth embodiment, the radiation detection unit provided with the OSL element 28 just below the distance from the optical fiber 4 and the filter 30 that provides the OSL element 28 directly below the distance from the optical fiber 4 and shields β rays and the like below. By distinguishing between the background radiation and the radiation to be measured.
図１１に放射線検出部の変形例を示す。放射線検出部の変形例の左図は放射線検出部の変形例１はコネクタ１４、光ファイバ４、ハウジング２５、素子固定用袋ナット２７、ＯＳＬ素子２８を備える。右図はコネクタ１４、光ファイバ４、ハウジング２５、素子固定用袋ナット２７、ＯＳＬ素子２８を備えた放射線検出部と、コネクタ１４、光ファイバ４、ハウジング２５、素子固定用袋ナット２７、ＯＳＬ素子２８、フィルタ３０を備える。本実施例を適用することでバックグラウンドの放射線と測定対象の放射線を弁別、高感度測定が実現できる。この実施例では素子固定用袋ナット２７を透過したβ線を測定する条件のため、前記素子固定用袋ナット２７の放射線検出面がアルミニウム材料の場合、０.４mm厚、鉄材料の場合、０.１mm厚程度（Ｙ−９０の最大エネルギー２.７８MeVの最大飛程の約１／１０）が望ましい。 FIG. 11 shows a modification of the radiation detection unit. The left figure of the modification of the radiation detection unit is a modification 1 of the radiation detection unit, which includes a connector 14, an optical fiber 4, a housing 25, an element fixing cap nut 27, and an OSL element 28. The figure on the right shows the radiation detection unit including the connector 14, the optical fiber 4, the housing 25, the element fixing cap nut 27, and the OSL element 28, and the connector 14, the optical fiber 4, the housing 25, the element fixing cap nut 27, and the OSL element. 28 and a filter 30 are provided. By applying this embodiment, high-sensitivity measurement can be realized by discriminating background radiation from measurement target radiation. In this embodiment, because the β ray transmitted through the element fixing nut 27 is measured, when the radiation detecting surface of the element fixing nut 27 is an aluminum material, the thickness is 0.4 mm. A thickness of about 1 mm is desirable (about 1/10 of the maximum range of Y-90 with a maximum energy of 2.78 MeV).
本発明のほかの実施例である実施例１２の漏洩水モニタリングシステムについて説明する。実施例１２で放射検出器を汚染水処理施設等の堰等に溜まった水に対して設けることで雨水等の水中に漏洩した放射性物質の測定をするものである。 A leakage water monitoring system according to embodiment 12 which is another embodiment of the present invention will be described. In Example 12, the radiation detector leaked into the water such as rain water is measured by providing the radiation detector with respect to the water accumulated in the weir or the like of the contaminated water treatment facility.
図１２に検出部の変形例を示す。検出部の変形例は放射線検出部１、検出システム３、光ファイバ４を備える。本実施例を適用することで雨水等３１に漏洩した漏洩水の検出が実現できる。 FIG. 12 shows a modification of the detection unit. The modification of the detection unit includes a radiation detection unit 1, a detection system 3, and an optical fiber 4. By applying this embodiment, it is possible to detect the leaked water leaked into the rainwater 31 or the like.
本発明のほかの実施例である実施例１３の漏洩水モニタリングシステムについて説明する。実施例１４でタンク等の下部に漏洩水集中ガイドを設けることで、漏洩水を任意の場所に集中させ漏洩水を効率よく収集するものである。 A leakage water monitoring system according to embodiment 13 which is another embodiment of the present invention will be described. By providing the leaked water concentration guide at the lower part of the tank or the like in Example 14, the leaked water is concentrated at an arbitrary place and the leaked water is efficiently collected.
図１３に漏洩水集中ガイドを示す。漏洩水集中ガイドはタンク等の下部に漏洩水集中ガイド３２を備える。本実施例を適用することでタンク等から漏洩した水を一箇所にまとめることが実現できる。 FIG. 13 shows a leakage water concentration guide. The leaked water concentration guide includes a leaked water concentration guide 32 at the lower part of the tank or the like. By applying this embodiment, it is possible to collect the water leaked from the tank or the like in one place.
本発明のほかの実施例である実施例１４の漏洩水モニタリングシステムについて説明する。実施例１４で光スイッチに光クロスコネクタを設けることで、多点計測を可能とするものである。 The leakage water monitoring system of Example 14 which is another Example of this invention is demonstrated. In Example 14, an optical cross connector is provided in the optical switch, thereby enabling multipoint measurement.
図１４に光スイッチ代案１を示す。光スイッッチ代案１は光ファイバ４、ＭＥＭＳミラー３３、反射板３４、コネクタ１４、放射線検出部１、を備える。本実施例を適用することで１台の計測装置及び解析装置で複数部分の線量及び線量率計測を実現できる。 FIG. 14 shows an optical switch alternative 1. The optical switch alternative 1 includes an optical fiber 4, a MEMS mirror 33, a reflecting plate 34, a connector 14, and the radiation detection unit 1. By applying the present embodiment, it is possible to realize dose and dose rate measurement of a plurality of portions with one measuring device and analyzing device.
本発明のほかの実施例である実施例１５の漏洩水モニタリングシステムについて説明する。実施例１５で光スイッチにガルバノスキャンスイッチを設けることで、多点計測を可能とするものである。 A leakage water monitoring system according to embodiment 15 which is another embodiment of the present invention will be described. By providing a galvano scan switch as an optical switch in the fifteenth embodiment, multipoint measurement can be performed.
図１５に光スイッチ代案２を示す。光スイッッチ代案２は光ファイバ４、反射板３４、コネクタ１４、放射線検出部１、を備える。本実施例を適用することで１台の計測装置及び解析装置で複数部分の線量及び線量率計測を実現できる。 FIG. 15 shows an optical switch alternative 2. The optical switch alternative 2 includes an optical fiber 4, a reflection plate 34, a connector 14, and a radiation detection unit 1. By applying the present embodiment, it is possible to realize dose and dose rate measurement of a plurality of portions with one measuring device and analyzing device.
本発明のほかの実施例である実施例１６の漏洩水モニタリングシステムについて説明する。実施例１６で監視盤（モニタ）を設けることで、漏洩場所の管理を可能とするものである。 A leakage water monitoring system according to embodiment 16 which is another embodiment of the present invention will be described. By providing a monitoring panel (monitor) in the sixteenth embodiment, it is possible to manage the leakage location.
図１６に監視盤の計測モニタ画面の変形例を示す。計測モニタ画面は原子炉３７周辺のタンク３５を示し、レベルゲージ３６、タンクナンバー及び線量率３８を設けることで漏洩場所、線量、線量率等を容易に管理することが実現できる。 FIG. 16 shows a modification of the measurement monitor screen of the monitoring panel. The measurement monitor screen shows the tank 35 around the reactor 37. By providing the level gauge 36, the tank number, and the dose rate 38, it is possible to easily manage the leak location, dose, dose rate, and the like.
１ 放射線検出部
２ 漏洩水受け皿
３ 検出システム
４ 光ファイバ
５ 滞留タンク
６ 漏洩水
７ 亀裂
８ フォトカプラ
９ 光源
１０ 光制御装置
１１ 光検出器
１２ 光発生用タイミングケーブル
１３ 制御・データ収集装置
１４ コネクタ
１５ ゴミ混入防止カバー
１６ 配管
１７ 排水口
１８ 放射線
１９ 半球型受け皿
２０ 漏洩水ガイド
２１ 平型受け皿
２２ 溜め機構
２３ 保護膜
２４ 受け皿
２５ ハウジング
２６ レーザー光
２７ 素子固定用袋ナット
２８ ＯＳＬ素子
２９ ＯＳＬ光
３０ フィルタ
３１ 雨水等
３２ 漏洩水集中ガイド
DESCRIPTION OF SYMBOLS 1 Radiation detection part 2 Leaked water receptacle 3 Detection system 4 Optical fiber 5 Retention tank 6 Leakage water 7 Crack 8 Photocoupler 9 Light source 10 Light control device 11 Photodetector 12 Light generation timing cable 13 Control / data collection device 14 Connector 15 Dust mixing prevention cover 16 Piping 17 Drain port 18 Radiation 19 Hemispherical tray 20 Leaked water guide 21 Flat tray 22 Reserving mechanism 23 Protective film 24 Dish 25 Housing 26 Laser light 27 Element fixing cap nut 28 OSL element 29 OSL light 30 Filter 31 Rainwater etc. 32 Leaked water concentration guide
Claims (18)
前記光ファイバに向かって通過したコネクタと同じコネクタを前記ＯＳＬ光が通過するように構成されており、
前記放射線検出部を、放射性物質を含む水が漏洩する複数の漏洩箇所に対応付けて、前記漏洩して上方から落下する水を受ける漏洩水受け皿と共に設けることで、前記漏洩水受け皿で受けた放射性漏洩水の放射性を検出するように構成され、前記放射線検出部は前記漏洩水受け皿に漏洩された水と所定の空間を挟んで離れて配置されることを特徴とする放射性漏洩水モニタリングシステム。 A radiation detection unit including an OSL element is connected to one end of an optical fiber, a light source for irradiating the OSL element with stimulation light is connected to the other end of the optical fiber via a connector, and the radiation detection unit and the optical fiber are combined. The radiation detection unit, the light source, and a measurement unit that receives and analyzes the OSL light emitted from the OSL element are connected by an optical branch fiber, and the radiation detection unit is obtained from the result of the OSL light reception analysis. In the OSL optical fiber type multi-point monitoring device that analyzes and displays the accumulated radiation dose of
The OSL light is configured to pass through the same connector as the connector that has passed toward the optical fiber,
Radioactivity received by the leaked water tray by providing the radiation detector with a leaked water tray that receives the water that leaks and falls from above , in association with a plurality of leak locations where water containing radioactive substances leaks The radioactive leak water monitoring system is configured to detect the radioactivity of leaked water, and the radiation detection unit is spaced apart from water leaked into the leaked water tray with a predetermined space therebetween .
上記放射線検出部が放射性物質を含む漏洩水受け皿の漏洩水に対し、漏洩水表面との間に空間を持って配置する構造に設置すること特徴とする放射性漏洩水モニタリングシステム。
In the leaked water monitoring system according to claim 1,
Radioactive leakage water monitoring system comprising placing the structure arranged with a space between the radiation detecting section against the leakage water leakage water pan containing radioactive materials, leakage Momizu surface.
モニタリング対象の指標核種の放射線がβ線である事を特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leak water monitoring system characterized by the fact that the radiation of the indicator nuclide to be monitored is beta rays.
放射性物質を含む漏洩水の受け皿の内表面を漏洩水が伝い流れする構造の受け皿と、その上部に放射線検出部を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leak water monitoring system comprising: a saucer having a structure in which leaked water flows along an inner surface of a saucer containing leaked water containing a radioactive substance; and a radiation detection unit on the saucer.
上記放射性物質を含む漏洩水の受け皿の内表面に、漏洩水が伝い流れするガイドを設けた漏洩水受け皿を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive water leakage monitoring system, characterized in that a leakage water tray provided with a guide through which leakage water flows is provided on the inner surface of the water leakage tray containing the radioactive substance.
上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の上部に放射線検出部を設ける事を特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leakage water monitoring system, wherein a receiving tray for leaking water containing the radioactive substance is provided in a flat plate-like structure, and a radiation detection unit is provided above the flat receiving plate.
上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の下部に放射線検出部を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leakage water monitoring system, wherein a receiving tray for leakage water containing the radioactive substance is provided in a flat plate structure, and a radiation detection unit is provided at a lower portion of the flat plate receiving tray.
上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の下部から一定の空間持って放射線検出部を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leakage water monitoring system, wherein a receiving tray for leaking water containing the radioactive substance is provided in a flat plate structure, and a radiation detection unit is provided with a certain space from the lower portion of the flat plate receiving tray.
上記放射性物質を含む漏洩水の受け皿を平板状の構造に設け、その平板状受け皿の表面に漏洩水を一定量溜める機構を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leak water monitoring system, wherein a leak water receiving tray containing the radioactive substance is provided in a flat plate-like structure, and a mechanism for collecting a certain amount of leak water on the surface of the flat plate receiving tray is provided.
前記放射線検出部を、放射性物質を含む水が漏洩する複数の漏洩箇所に対応付けて、前記漏洩する水を受ける漏洩水受け皿と共に設けることで、前記漏洩水受け皿で受けた放射性漏洩水の放射性を検出するように構成され、
上記放射性物質を含む漏洩水の放射線検出部を保護膜で覆う構造で漏洩水中に設けることを特徴とする放射性漏洩水モニタリングシステム。 A radiation detection unit including an OSL element is connected to one end of an optical fiber, a light source that irradiates the OSL element with stimulation light is connected to the other end of the optical fiber, and the radiation detection unit, the light source, and the OSL element An OSL optical fiber type multi-point monitoring device that connects a measuring unit that receives and analyzes the OSL light emitted from the optical branching fiber, and analyzes and displays the accumulated radiation amount of the radiation detecting unit from the result of the received light analysis of the OSL light.
Corresponding to a plurality of leak locations where water containing radioactive substances leaks, the radiation detector is provided with a leaked water tray that receives the leaked water, thereby reducing the radioactivity of the radioactive leaked water received by the leaked water tray. Configured to detect,
A radioactive leaked water monitoring system, characterized in that the radiation detection part of leaked water containing the radioactive substance is provided in the leaked water with a structure that covers with a protective film.
放射線検出部にβ線を遮蔽する放射線フィルタ付とフィルタなしの複数の放射線検出部を設け、両差の測定差分値から純β線放出核種量を定量することを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
Radiation leakage water monitoring system characterized in that the radiation detection unit is provided with a plurality of radiation detection units with and without a β-ray shielding filter, and the amount of pure β-ray emission nuclide is quantified from the measured difference value of both differences .
放射性物質を含む漏洩水を導引する堰を設け、上記堰の一箇所あるいは複数の点に放射線検出部を設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1 or 2,
A radioactive leakage water monitoring system comprising a weir for guiding leakage water containing a radioactive substance, and a radiation detector provided at one or a plurality of points of the weir.
放射性汚染水処理タンク下部あるいは配管下部から漏洩水を一箇所に導引する漏洩水集中ガイドを設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system as described in any one of Claims 1-12,
A radioactive leakage water monitoring system characterized by providing a leakage water concentration guide that guides leakage water from a lower part of a radioactively contaminated water treatment tank or a lower part of a pipe.
ＯＳＬ素子を刺激する光源と放射線検出部を接続する光ファイバ間に、光スイッチを設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leakage water monitoring system according to any one of claims 1 to 13,
A radioactive leakage water monitoring system comprising an optical switch between an optical fiber connecting a light source for stimulating an OSL element and a radiation detection unit.
多点計測を可能とするため、光スイッチに光クロスコネクタを設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1,
In order to enable multipoint measurement, an optical cross connector is provided in the optical switch, and the radioactive leak water monitoring system is characterized.
多点計測を可能とするため、光スイッチにガルバノスキャンスイッチを設けることを特徴とする放射性漏洩水モニタリングシステム。 In the leaked water monitoring system according to claim 1,
A radioactive water leakage monitoring system characterized by providing a galvano scan switch in an optical switch to enable multipoint measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012144909A JP6014388B2 (en) | 2012-06-28 | 2012-06-28 | Radioactive leakage water monitoring system and radioactive leakage water monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012144909A JP6014388B2 (en) | 2012-06-28 | 2012-06-28 | Radioactive leakage water monitoring system and radioactive leakage water monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2014009977A JP2014009977A (en) | 2014-01-20 |
| JP6014388B2 true JP6014388B2 (en) | 2016-10-25 |
Family
ID=50106823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012144909A Active JP6014388B2 (en) | 2012-06-28 | 2012-06-28 | Radioactive leakage water monitoring system and radioactive leakage water monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6014388B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6267537B2 (en) * | 2014-02-21 | 2018-01-24 | 鹿島建設株式会社 | Radioactive material leak detection method |
| JP6058570B2 (en) * | 2014-02-24 | 2017-01-11 | 株式会社東芝 | α-ray detector |
| CN104898149B (en) * | 2015-04-21 | 2018-02-02 | 福建师范大学 | A kind of Intelligent rainwater radioactivity survey system and measuring method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0829596A (en) * | 1994-07-19 | 1996-02-02 | Toshiba Eng Co Ltd | Drip tray |
| JP3591275B2 (en) * | 1998-02-20 | 2004-11-17 | 株式会社日立製作所 | Radiation intensity measurement device |
| JP4265081B2 (en) * | 2000-05-11 | 2009-05-20 | 株式会社Ｉｈｉ | Leakage detector for radioactive liquid waste storage tank |
| JP4227073B2 (en) * | 2004-05-19 | 2009-02-18 | 三菱電機株式会社 | Radiation water monitor |
-
2012
- 2012-06-28 JP JP2012144909A patent/JP6014388B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014009977A (en) | 2014-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9018586B2 (en) | Apparatuses for large area radiation detection and related method | |
| JP5816542B2 (en) | Dose rate measurement system and dose rate measurement method | |
| JP6475931B2 (en) | Radioactive substance monitoring device and radioactive substance monitoring method | |
| Chichester et al. | Comparison of BCF-10, BCF-12, and BCF-20 scintillating fibers for use in a 1-dimensional linear sensor | |
| Bae et al. | Plastic scintillator beta ray scanner for in-situ discrimination of beta ray and gamma ray radioactivity in soil | |
| JP6014388B2 (en) | Radioactive leakage water monitoring system and radioactive leakage water monitoring method | |
| KR101419766B1 (en) | A portable survey meter for measuring the radioactive contamination in earth | |
| JP4659612B2 (en) | Water monitor | |
| JP6524484B2 (en) | Radiation measurement method and radiation measurement apparatus | |
| JP6469412B2 (en) | Radioactive substance measuring instrument | |
| JP6867884B2 (en) | Radiation measuring device | |
| Jackson et al. | Testing of a scintillator and fibre optic based radiation sensor | |
| JP5669782B2 (en) | Radioactivity inspection equipment | |
| JP2015081905A (en) | Radioactive solution detection monitor | |
| JP6420637B2 (en) | Radiation measuring apparatus and measuring method thereof | |
| Döhler et al. | Characterization of a fiber optic radiation sensor prototype for nuclear dismantling | |
| Whittaker et al. | A fibre optic based approach and device for sensing alpha particles in liquids | |
| KR101657577B1 (en) | Measurement device and method of total gamma activity for clearance | |
| Zubair et al. | Fiber optic coupled survey meter for NORM and low-level radioactivity monitoring | |
| JP2012242369A (en) | Radiation detector | |
| JP7140658B2 (en) | Radiation measuring device and radiation measuring method | |
| KR20090052428A (en) | Radiation detector capable of measuring energy level and its detection method | |
| Terasaka et al. | In-situ detection of high-energy beta ray emitter 90Sr/90Y inside the Fukushima Daiichi Nuclear Power Station Unit 3 reactor building using a liquid light guide Cherenkov counter | |
| RU2217777C2 (en) | Device for evaluating concentration of radioactive materials | |
| RU2457469C1 (en) | Mobile device for identifying concealed substances (versions) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20150204 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20151027 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20151222 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20160322 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20160411 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20160830 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20160926 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 6014388 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |