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An analytical model to decompose mass transfer and chemical process contributions to molecular iodine release from aqueous phase under severe accident conditions

Zablackaite Giedre|Shiotsu Hiroyuki|Kido Kentaro|Sugiyama Tomoyuki
한국원자력학회 (Korean Nuclear Society)|2024.02|Nuclear Engineering and Technology|제56권 제2호|pp. 536-545|DOI 10.1016/j.net.2023.10.030

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키워드

Iodine chemistryChemical reaction kineticsMass transfer coefficientTwo-film theoryBoiling water reactor
주제분류원자력공학

초록

Radioactive iodine is a representative fission product to be quantified for the safety assessment of nuclear facilities. In integral severe accident analysis codes, the iodine behavior is usually described by a multi-physical model of iodine chemistry in aqueous phase under radiation field and mass transfer through gas-liquid interface. The focus of studies on iodine source term evaluations using the combination approach is usually put on the chemical aspect, but each contribution to the iodine amount released to the environment has not been decomposed so far. In this study, we attempted the decomposition by revising the two-film theory of moleculariodine mass transfer. The model involves an effective overall mass transfer coefficient to consider the iodine chemistry. The decomposition was performed by regarding the coefficient as a product of two functions of pH and the overall mass transfer coefficient for molecular iodine. The procedure was applied to the EPICUR experiment and suppression chamber in BWR.

Abstract

Radioactive iodine is a representative fission product to be quantified for the safety assessment of nuclear facilities. In integral severe accident analysis codes, the iodine behavior is usually described by a multi-physical model of iodine chemistry in aqueous phase under radiation field and mass transfer through gas-liquid interface. The focus of studies on iodine source term evaluations using the combination approach is usually put on the chemical aspect, but each contribution to the iodine amount released to the environment has not been decomposed so far. In this study, we attempted the decomposition by revising the two-film theory of moleculariodine mass transfer. The model involves an effective overall mass transfer coefficient to consider the iodine chemistry. The decomposition was performed by regarding the coefficient as a product of two functions of pH and the overall mass transfer coefficient for molecular iodine. The procedure was applied to the EPICUR experiment and suppression chamber in BWR.

참고문헌 (42)

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  42. ) and has been applied to RTF and ISP-41 experiments. Although the simulation results are provided using dataset 10a, the reactions of inorganic iodine species listed in the dataset are quite similar to the LIRIC dataset. The KICHE code used in this study is almost the same as the original, "When JAEA participated in the OECD", NEA ISP-41 project

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