[en] An integrated analysis of Mark-I liner attack in a postulated core melt accident is presented. The approach consists of the mechanistic treatment of the sequence of physical phenomena that lead to liner contact by corium debris, and their coupling through a probabilistic framework that allows representation of uncertainties. The authors emphasize a physically consistent treatment in each sequence, but allow for qualitatively different scenarios to represent the range of behavior due to model uncertainties. The results are presented in a format that allows their direct use in PRAs, and, in particular, expert opinion is incorporated by a new methodological approach (first applied in the study of α-mode failure-NUREG/CR-5030) that involves expert review of, and comment on, a fully documented study all under one cover. Details of the methodology (Risk Oriented Accident Analysis Methodology-ROAAM) are also presented