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Development of a fast reactor for minor actinides transmutation, 2; Study on the MA transmutation core concepts

マイナーアクチニド核変換のための高速炉の開発,2; MA核変換炉心概念の研究

藤村 幸治*; 大木 繁夫; 竹田 敏一*

Fujimura, Koji*; Oki, Shigeo; Takeda, Toshikazu*

The objective of this study is the efficient and safety transmutation of long-lived minor actinides using sodium cooled fast reactors. MA transmutation fast reactor core concepts which harmonize efficient MA transmutation with core safety were developed. We reduce sodium void reactivity which is increased due to the higher MA content by optimizing key core parameters of axially heterogeneous core with sodium plenum. We also introduced indices of "the effective void reactivity" by assuming the axial coolant sodium density change distribution for ULOF (unprotected loss of flow) accident. These indices were introduced based on observation of sluggish transient behavior for the fast reactor core with the upper sodium plenum. The homogeneous MA loaded core was designed whose effective void reactivity is negative while achieving the amount of MA transmutation more than the two times to that achieved in previous studies.

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