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高速増殖原型炉「もんじゅ」燃料取扱貯蔵設備の運転・保守経験,1; 総合機能試験完了後から平成8年3月まで

Operation and maintenance experience on the fuel handling systems and storage facilities of "MONJU", 1

長広 義彦; 廣部 岩男; 山田 多圭士; 内藤 栄一; 小幡 宏幸; 浜野 知治; 皆藤 泰昭; 今村 弘章; 甲高 義則; 井関 淳; 大場 俊雄; 池田 博嗣

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「もんじゅ」の燃料取扱貯蔵設備は、平成3年4月に据付を完了した後、5月から総合機能試験を開始し平成4年8月に終了した。平成4年12月に設備移管を受け性能試験に入った。燃料装荷試験においては炉心燃料198体の炉内への移送、炉心への装荷を燃料取扱設備により行った。この間大きなトラブルもなく、円滑に運転が行われ平成6年4月5日168体で初臨界を達成した。燃料装荷以降も出力分布試験、模擬体洗浄処理運転を実施しており、平成4年から毎年設備点検を実施して設備の健全維持に努めている。本報告書は総合機能試験完了以降の燃料取扱設備の運転及び保守についてまとめたもので、この間に経験したトピックスを記載するとともに設備の信頼性向上に向けた今後の検討事項についても述べたものである。

Construction of the 'Monju' fuel handling systems was completed in April, 1992. From March 1991 to August 1992, pre-commissioning tests were carried out. In December 1992, all the systems of Monju were transfered to PNC, and commissioning tests and reactor physics tests, were started. For the first time, during these physics tests, the fuel handling systems were operated for one of the commissioning tests 'Loading to Criticality', without significant problems. 168 fuel sub-assemblies were loaded into the core and the first criticality was achieved on 5th April 1994. The fuel handling systems continued in operation for the 'Loading to Full Size of the Core', power distribution test and for cleaning discharged dummy sub-assemblies. To keep these fuel handling systems working somothly and satisfactorily annual maintenance has been carried out since 1992. This paper describes the operation and maintenance experience of fuel handling systems after the pre-commissioning tests and future study items for system reliability improvement.

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