engleski

Binning of NEK IPE core damage sequences

The paper presents the part of the creation of the new Risk Spectrum Nuclear Power Plant "Krško" (NEK) Probabilistic Safety Assessment (PSA) Project which sorts all NEK Core Damage Sequences (CDSs) into clusters (bins, groups) that have the common phenomenological and systemic response from the aspect of the required Containment Systems. A single CDSs cluster is covered then with a single Bridge Tree (BT) which has been developed for each of the defined CDSs clusters. In this way the complete set of the NEK Individual Plant Examination Project Level 1 CDSs were propagated to the NEK Plant Damage States (PDSs) and Level 2 assessment, what was not the current case. The existing NEK PSA model Risk Spectrum was used in the course of the quantification process. The comparison of the new quantified frequencies with the existing PDSs frequencies was performed and the difference explained. The project registered 50 CDSs clusters and therefore 50 BTs were modelled. They ended up with 1462 Bridge Tree Sequences. The number of PDSs clusters after the assignment of PDS to each BT sequence is 100. Total core damage frequency is 5.580 E-05.

probabilistic safety assessment; PSA; risk; NPP Krsko

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