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      • KCI등재

        Contribution of Production and Loss Terms of Fission Products on In-containment Activity under Severe Accident Condition for VVER-1000

        S. Jafarikia,S.A.H. FEGHHI 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1

        The purpose of this paper is to study the source term behavior after severe accidents by using a semikineticmodel for simulation and calculation of in-containment activity. The reactor containment specificationand the safety features of the containment under different accident conditions play a great rolein evaluating the in-containment activity. Assuming in-vessel and instantaneous release of radioactivity into the containment, the behavior of incontainmentisotopic activity is studied for noble gasses (Kr and Xe) and the more volatile elements ofiodine, cesium, and aerosols such as Te, Rb and Sr as illustrative examples of source term release underLOCA conditions. The results of the activity removal mechanisms indicates that the impact of volumetricleakage rate for noble gasses is important during the accident, while the influence of deposition on thecontainment surfaces for cesium, mainly iodine isotopes and aerosol has the largest contribution inremoval of activity during evolution of the accident.

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