MCCI Simulation Comparison Between MELCOR and CORQUENCH

Abstract

This paper presents a comparison between the MELCOR and CORQUENCH codes in modeling the progression of a reactor scale ex-vessel core melt. This study investigates the impact of advanced modeling options on the progression of molten corium-concrete interactions (MCCI). Two cooling phenomena, water ingression and melt eruptions, and the crust anchoring phenomenon were shown to largely impact the accident progression. Recommendations are made concerning updating CONRCON-Mod3 within MELCOR and future research activities.