高速実験炉「常陽」運転経験報告書; カバーガス純度連続監視装置の運転経験

Operation experience on experimental fast reactor "JOYO"; Operation experience of cover gas monitoring system

飯島 稔*; 鈴木 伸也 ; 畠中 孝司*; 村上 隆典*; 原 和之*; 岩井 広*; 寺門 嗣夫 

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「常陽」一次、二次系カバーガス中の不純物濃度を常時監視するため、カバーガス純度連続監視装置が設置され、今日まで運転されてきた。これまでの運転経験をまとめると以下のとおりである。(1)本装置により、カバーガス系内の異常濃度上昇を早期に察知できた。(2)常時濃度監視ができるため、異常時の原因調査及び系内置換効果を観察する上で非常に役立った。(3)装置の各種改造を行い、測定性能等が向上し、データの信頼性が更に高くなった。

Cover gas monitorring system was installed for obtaining the information of impurities concentration in the primary and secondary cover gas on JOYO, and it has been operated to these days. The experience results are as follows; (1)Increasing of impurities concentration in the cover gas were detected quickly by this system. (2)This system was able to detected the impurities concentration continuously, so it is very useful for investigation the cause of abnormal condition and observation the effect of cover gas purge. (3)This system was modified some points, consequently the measurement performance and reliability of data were advanced more than old one.