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Upgrade of Krško Level 2 PSA model for regulatory activities [Elektronski vir]
Vrbanić, Ivan ; Bašič, Ivica ; Cimeša, Siniša, 1976-
In 2007, Slovenian Nuclear Safety Administration initiated the project on applications of Krško PSA model in the regulatory activities. As a part of the project, the Level 2 PSA model (internal ...events at power) was to be upgraded in a way that Level 2 risk measures can be computed more directly, for the purpose of regulatory applications. One specific point of the initial Krško PSA study was that only the top 40 Level 1 core damage sequences were propagated to the bridge trees and Level 2, out of the total of 184 core damage sequences. At the time of the initial study, these particular 40 sequences contributed, cumulatively, more than 90% to the total core damage frequency. This approach can be considered acceptable for the long term averaged base case results, but may be questionable for the applications such as PSA-based event analysis where Level 2 results may need to be re-computed conditionally on the specific (e.g. failed) status of some containment systems. Therefore, the model had to be upgraded in a way that all Level 1 core damage sequences are propagated to the Level 2. This involved Level 1 sequence grouping, upgrade to the bridge tree models, and propagating of a number of new plant damage states (PDS) to the radiological release categories. The process resulted with a model which can be used for repeated computing of the Level 2 results with taking into account all Level 1 core damage sequences. The paper describes the model upgrade and the results of new Level 2 quantification.
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