AP1000 IVR三层熔融池结构评价分析

An Assessment Methodology of Thee-Layers Melt Configuration during IVR for AP1000

严重事故时AP1000采取一回路卸压和压力容器外部冷却的熔融物堆内滞留(IVR)措施。本文建立IVR分析模型,用于评价AP1000 IVR时两层和三层熔融池结构的传热行为。计算结果表明,重金属层的形成导致轻金属层变薄、集热效应增强,而且重金属层越厚,轻金属层集热效应越强。

In-Vessel Retention Analysis Model （ IVRAM ） is formulated to assess the thermal response of the Two-Layers melt configuration and Thee-Layers melt configuration during IVR for AP1000 with anticipative depressurization and reactor cavity flooding in severe accident. The results of the calculations for the melt configuration show that the presence of the heavy metallic layer at the bottom of the lower head decreases the thickness of the top light metallic layer and consequently increases the risk of focusing effect, the focusin~ effect of the li~.ht metallic laver increases with the increase of the thick of heavy metallic laver.