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<p>Dibutyl phosphate (DBP) is a problematic compound in reprocessing plants, affecting not only the extraction processes of U and Pu, but also the vitrification of high-level liquid waste (HLLW). Previous full-scale glass melter tests indicated that even a minor amount of DBP in simulated HLLW altered the cold-cap morphology, making it larger and thicker. In this study, small-scale melter tests revealed that the influence of DBP on cold-cap morphology is related to the Zr/Mo concentration ratio in HLLW. When the Zr/Mo ratio was high, a tall wall composed of calcined waste components formed around the cold cap, and a thick waste layer developed at its bottom. These DBP-induced changes were mitigated by lowering the Zr/Mo ratio; the cold cap then adopted a flatter morphology similar to that observed in the absence of DBP.</p> Graphical abstract <p></p>

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Morphological change in cold cap by dibutyl phosphate: The influence of zirconium and molybdenum in high-level liquid waste

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月17日

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  • Kazuyoshi Uruga,
  • Yuma Sekiguchi,
  • Tsuyoshi Usami

摘要

Dibutyl phosphate (DBP) is a problematic compound in reprocessing plants, affecting not only the extraction processes of U and Pu, but also the vitrification of high-level liquid waste (HLLW). Previous full-scale glass melter tests indicated that even a minor amount of DBP in simulated HLLW altered the cold-cap morphology, making it larger and thicker. In this study, small-scale melter tests revealed that the influence of DBP on cold-cap morphology is related to the Zr/Mo concentration ratio in HLLW. When the Zr/Mo ratio was high, a tall wall composed of calcined waste components formed around the cold cap, and a thick waste layer developed at its bottom. These DBP-induced changes were mitigated by lowering the Zr/Mo ratio; the cold cap then adopted a flatter morphology similar to that observed in the absence of DBP.

Graphical abstract