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Zablackaite, G.; 塩津 弘之; 城戸 健太朗; 杉山 智之
Nuclear Engineering and Technology, 56(2), p.536 - 545, 2024/02
被引用回数：0 パーセンタイル：0.08(Nuclear Science & Technology)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 molecular-iodine 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.
Zablackaite, G.; 塩津 弘之; 城戸 健太朗; 杉山 智之
no journal, ,
To investigate the mass transfer effect on the overall iodine release to the environment, we propose a chemical-process-reduced mass transfer (CPR-MT) model for iodine that is based on two-film theory and includes an effective mass transfer coefficient (
). By formally decomposing into iodine chemistry and mass transfer contributions, we discuss their impact for a variety of severe accident conditions of nuclear power station.
Zablackaite, G.
no journal, ,
シビアアクシデント時の環境へのヨウ素放出に対して、プールスクラビングによる気液間の移行挙動を調査するために、境膜理論に基づき、有効物質移動係数をヨウ素化学による寄与と物理的な物質移行の寄与の積の形で分解することにより、各要素の寄与の重要性を定量的に評価する手法を考案した。pHによる両機構の寄与を定量的に解析し、低pH及び高質量移行係数の条件で物理的な寄与が高くなる傾向が示された。この評価手法は、事故条件に対する移行メカニズムの検討に有用である。
