engleski

Assessment of LOCA Calculation for NEK IPE Level1/Level2 Integration

Medium break loss of coolant accident is in probabilistic safety analysis typically defined as break size for which high pressure injection system with single failure criteria is sufficient to mitigate consequences of the accident, e.g. to maintain rod temperatures bellow damage criteria. Consequently, break sizes for whose mitigation low pressure injection system is essential, are assumed to fall in large break loss of coolant category. In this report, best-estimate thermohydraulic code RELAP5/mod2 has been used to determine the role of accumulators on the system response for different break sizes. Outcome of the analysis has shown that most severe break sizes, with respect to the rod temperature are: 5 in equivalent break size for medium break and 12 in equivalent break size for large break. The results of RELAP5/mod2 analysis have been compared with MAAP results from NEK (Nuklearna Elektrana Krško) IPE (Individual Plant Examination) level1/level2 integration and major differences in the results were discussed.

NPP safety; medium break loss of coolant accident; accumulators

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