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Method to prevent accidental ruthenium volatilization from high-level liquid waste using alkaline earth hydroxide

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Abstract

We investigated a method to prevent RuO4 formation from a heated high-level liquid waste (HLLW) in a severe accident in a reprocessing facility. When the alkali or alkaline earth hydroxides were added in excess of the point of neutralization of HLLW, the amount of RuO4 released was significantly suppressed to less than 1% of that without hydroxide addition. Alkaline earth hydroxides would be more suitable for actual use, because alkali hydroxides enhance RuO4 release by an addition below the equivalent neutralization whereas alkaline earth hydroxides do not have such effect.

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Acknowledgements

This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. The authors acknowledge the unfailing assistance of A. Kobayashi and S. Kato of Electric Power Engineering Systems Co., Ltd., in conducting the present experiment including the chemical analysis.

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Authors and Affiliations

  1. Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa, 240-196, Japan

    Yuma Sekiguchi, Tetsuya Kato, Kazuyoshi Uruga & Tsuyoshi Usami

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  1. Yuma Sekiguchi
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  2. Tetsuya Kato
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  3. Kazuyoshi Uruga
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  4. Tsuyoshi Usami
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Correspondence to Yuma Sekiguchi.

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Sekiguchi, Y., Kato, T., Uruga, K. et al. Method to prevent accidental ruthenium volatilization from high-level liquid waste using alkaline earth hydroxide. J Radioanal Nucl Chem 333, 347–355 (2024). https://doi.org/10.1007/s10967-023-09199-3

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  • DOI: https://doi.org/10.1007/s10967-023-09199-3

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