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高速実験炉「常陽」性能試験報告書; 音響法異常監視(MT-31)炉内音響監視(1)

"JOYO" Start-up test report; In-core acoustic monitoring (1)

佐野 健一*; 村松 寿晴; 山本 寿*; 三田 敏男*; 大谷 秀二*; 池上 哲雄*; 田村 誠司*

not registered; Muramatsu, Toshiharu; Yamamoto, Hisashi*; Sanda, Toshio*; not registered; not registered; Tamura, Seiji*

高速炉の異常を早期に発見し,安全性及び経済性を高めるための信頼できる異常監視技術の開発が望まれている。▲異常監視技術には,いくつかの方法があるが,高速実験炉「常陽」では炉内の異常監視法の1つとして音響法を採用している。この方法は,炉内に設置した音響検出器からの信号のパワースペクトル及びRNS値を監視し,それらに正常時との差が生じたら異常の可能性有りと判断して原因を調査するものである。▲現在,音響検出器は炉心上部位恒に2体設固しており(炉心位置〔5A2〕及び〔5C2〕の制御棒予備孔位置),低出力試験及び50MW出力上昇試験期間中の正常時に収集した炉内音響データの解析結果を検討した。その結果は次のようになる。▲〔5A2〕と〔5C2〕炉内音響検出糸では特性が相当異なり,〔5C2〕炉内音響検出糸は回転プラグ上の騒音の影響を強く受け,また〔5A2〕炉内音響検出糸は高温時に信号の振幅が半減する。▲本検出糸は各種のノイズのためSN比が極めて悪く,炉内のナトリウム中を伝播してくる音響を,どの程度検出しているかは,現在のところ不明である。▲制御棒振動による衝撃音については,制御棒駆動機構ハウジンク音響検出器の方が,よく検出できた。▲現在までのところ,炉内音響監視からは特に異常は認められない。▲

A great interest exists in developing the reliable rapid malfunction detection system for the safe and economic operation of LMFBR. In the experimental fast reactor "Joyo", the acoustic detection technique was adopted to monitor the reactor core as one of malfunction detection techniques. According to this technique, power spectral density and rms value of the signal from the in-core acoustic detector are monitored. If they vary greatly rrom their normal pattern and value, the inspection is held to assure the failure part. Two in-core acoustic detectors are inserted above the reactor core (address [5A2] and [5C2]). The data from them at normal reactor condition were collected during the low power test and the power up test up to 50MW. Some conclusions were derived from the analysis of the data. (1)The characteristies of [5A2] and [5C2] in-core acoustic monitoring systems are different. The [5C2] in-core acoustie monitoring system is affected by acoustic noises of the rotating plug. While the signal amplitude or [5A2] in-core acoustic signal was reduced by half at high sodium temperature. (2)A S/N ratio or this system is poor quality, therefore the amount of information detected from sodium by the in-core acoustic detectors is not known yet. (3)CRD housing acoustic detector is more sensitive to the impact sound caused by control rod vibration than the in-core acoustic detectors. (4)Abnormal condition has not been found until now according to this monitoring system.

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