Abstract
Abstract After Fukushima Daiichi accident the importance of software tools that enable the NPP safety assessment for the overall sequence of severe accident processes has revived. In accordance with this issue Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN) in cooperation with the nuclear industry organizations is developing an integrated software package SOCRAT that is intended for numerical analysis of the behaviour of LWR at various stages of design extension conditions, including reactor core degradation, RPV failure and long-term melt retention in a core catcher. This paper presents a review of current state of SOCRAT models development, validation and practical applications, with emphasis on best-estimate mechanistic description of relevant physical processes.
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