Development of high performance clarification system for spent MOX fuel reprocessing

使用済MOX燃料再処理のための高性能清澄システムの開発

竹内 正行 ; 高田 岳 ; 斉藤 慧太*; 近沢 孝弘*

Takeuchi, Masayuki; Takata, Takeshi; Saito, Keita*; Chikazawa, Takahiro*

再処理工程の安定確保を図る上で、燃料溶解工程で発生するスラッジの管理は極めて重要な項目の一つである。清澄工程でより高いスラッジ捕集性能を得るために、遠心清澄機とフィルタ技術を組み合わせた新たな清澄システムの開発を進めてきた。本研究では、新たな清澄システム全体のスラッジ捕集性能を工学規模で評価した。その結果、システム全体のスラッジ捕集性能はすべての試験条件を通じて99.5%以上であり、極めて高い性能を示した。また、遠心清澄機でのスラッジ捕集性能は試験条件に依存し、87%から98%であった。本研究の成果はこの新たな清澄システムがスラッジ捕集性能を大幅に向上させるための有望な技術の一つであることを示した。

Control of insoluble sludge from fuel dissolution process is one of the important issues to secure the safety in reprocessing plant operation. In order to achieve the higher sludge recovery in the clarification stage, new clarification system which is an integrated technology of centrifugal device and filter unit has been developed for spent MOX fuel reprocessing. In this study, over-all clarification performance of this integrated system was evaluated on engineering scale. As results, total sludge recovery rate of more than 99.5 % was achieved in all test conditions by this system from the engineering test and this new clarification system showed excellent clarification performance. The sludge recovery rate of centrifugal device was influenced by test conditions and was in the range from 87 to 98 %. This study showed this technology is one of the promising clarification systems to improve the performance of sludge recovery greatly.