Anomaly detection technique based on acoustic measurement for sodium-cooled fast reactor

相澤 康介 ; 植木 祥高*

Aizawa, Kosuke; Ueki, Yoshitaka*

ナトリウム冷却高速炉において異常事象を早期に検知することは安全性向上に寄与するものである。音響計測は応答性が良く、かつ異常発生箇所の物理量を計測点で取得できる特性を有しており、音響計測による異常検知技術の開発を進めている。本論文では、ナトリウム冷却高速炉に音響計測を適用する上での課題を整理するとともに、その課題への対策方針を検討し、かつ研究開発の状況を示す。

Early detection of an anomaly greatly enhances the safety of nuclear power plants. A detection system called an acoustic measurement has high responsiveness, because sound produced by the anomaly is transmitted from the place at which an anomaly has occurred to a measurement point at a speed of sound, and the acoustic measurement has the potential to directly detect the physical quantity of an anomaly at its occurrence point. For sodium-cooled fast reactors, we have been developing an anomaly detection technique using the acoustic measurement that offers these features. This paper clarifies issues in applying the acoustic measurement to a sodium-cooled fast reactor, how we solve the issues, and the current status of this research.