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核燃料リサイクルシステム内の核種移行率に関する研究

Study on the nuclide behavior in nuclear fuel recycling system

藤井 俊行*; 山名 元*

Fujii, Toshiyuki*; not registered

低除染でのリサイクルシステムにおいて設計上不可欠の情報である放射性核種の移行率に関する研究の一環として、放射能は低いがリサイクル燃料の性能への影響が多い元素であるモリブデンとパラジウムの、PUREX、TRUEX抽出条件下での分配特性を実験的に調べ、その化学的なメカニズムの同定を行った。吸光分光分析を抽出実験と並行することにより、抽出錯体種の同定および抽出メカニズムを検討した。この結果により、モリブデンとパラジウムのPUREX、TRUEX工程内での抽出移行および分配特性に関する知見を得た。

For establishing a recycling system based on low-decontamination, the distribution behaviors of radionuclides in the process are essential information for the design of the system. Molybdenum and palladium are less radioactive fission products, but attention should be paid to them because they are likely to extremely affect the performance of the recycled fuels. In this context, in this study, the extraction behaviors of molybdenum and palladium under conditions of PUREX and TRUEX extraction process were experimentally studied, and their chemical mechanisms were discussed. In cojunction with the extraction experiments, absorption spectrometry was applied to identify the related species and the extraction mechanism. As a result, knowledge for the distribution characteristics of molybdenum and palladium in PUREX and TRUEX process was reinforced.

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