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RELAP5/mod2 Analysis of Inadvertent Closing of the Main Steam Isolation Valve in NPP Krško

The paper describes the use of system code RELAP5/mod2 in analysis of inadvertent closing of the main steam isolation valve that happened in NPP Krško on September, 25 1995. Three cases were calculated in order to address different aspects of the modelled transient. This preliminary calculation shows that, even though the real plant behaviour isn’t completely reproduced, such kind of analysis can help to better understand plant behaviour and to identify important phenomena in the plant during transient. The result of the calculation for the case no. 3, indicates that, with better understanding of status of the plant systems, calculated results could be very similar to the plant data.

NPP safety; transient analyses; MSIV closure

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