Probabilistic Safety Assessment (PSA) of Natural External Hazards Including Earthquakes

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The Fukushima Dai-ichi accident triggered discussions about the significance of external hazards and their treatment in safety analyses. In addition, stress tests results have shown vulnerabilities and potential of cliff-edge effects in plant responses to external hazards and have identified possibilities and priorities for improvements and safety measures’ implementation at specific sites and designs.

In order to address these issues and provide relevant conclusions and recommendations to CSNI and CNRA, the CSNI Working Group on Risk Assessment (WGRISK) directed, in co-operation with the CSNI Working Group on Integrity and Ageing of Components and Structures (WGIAGE), the current workshop, hosted by UJV Rez in Prague, Czech Republic on 17-19 June 2013. The key objectives of the workshop were to collect information from the OECD member states on methods and approaches being used, and experience gained in probabilistic safety assessment of natural external hazards, as well as to support the fulfillment of the CSNI task on “PSA of natural external hazards including earthquakes.”