PSAM 16 Conference Paper Overview
Welcome to the PSAM 16 Conference paper and speaker overview page.
Lead Author: Tamas Siklossy Co-author(s): Attila Bareith bareith@nubiki.hu
Barnabas Toth tothb@nubiki.hu
Bence Burjan burjan@nubiki.hu
| Assessing the Impact of Combined External Events on the Safety of NPP Paks |
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| Originally, mostly single external hazards were considered in the definition of the design basis of the Paks NPP in Hungary. Accordingly, the analysis and evaluation of plant resistance against design basis loads as well as the probabilistic safety assessment (PSA) of the plant have been limited to these single external hazards. However, some specific requirements of the Hungarian Nuclear Safety Codes as well as international recommendations and lessons learned from the Fukushima Dai-ichi NPP accident pointed out the need for systematically assessing the combinations of external hazards for the Paks NPP so that their impact on plant safety can be determined, understood and evaluated. The assessment has lately been completed by following the commonly exercised steps in this domain: hazard selection and screening, probabilistic hazard assessment, evaluation of plant protection, plant response and fragility analysis, development of event sequence models for hazard initiated plant transients, and risk quantification and evaluation of results. The analysis proved to be a significant challenge due to scarcity of data, lack of knowledge as well as limitations of existing PSA methodologies. Detailed assessment was performed for the following combinations of external hazards: handling of dangerous substances under severe meteorological conditions; multiple accidents in nearby industrial facilities due to a common initiator of natural origin; earthquake occurring during extremes of ambient temperature; storm; extreme wind and snow; extreme low or extreme high ambient temperature. Risk induced by the combinations of extreme wind and snow as well as earthquake during extreme warm weather was quantified using either a detailed PSA model or a bounding assessment, as shown appropriate. This paper presents an overview of systematically considering combinations of external events in the design basis and in the probabilistic safety assessment of NPP Paks. Important methodological aspects as well as key analysis results and findings are summarized. |
Paper SI142 Preview
Author and Presentation Info
Lead Author Name: Tamas Siklossy (siklossyt@nubiki.hu)
Bio: After seven years of being a research fellow, Mr. Siklossy has in 2017 been nominated as the head of the Risk Assessment Division of NUBIKI Nuclear Safety Research Institute, a TSO in Hungary. As his primary research topic, he has been working in the field of level 1 PSA of natural external events, especially on meteorological events and river contamination. Moreover, he has also been involved in many different areas of PSA development as well as review.
Country: Hungary
Company: NUBIKI Kft.
Job Title: Head of Risk Assessment Division
Bio: After seven years of being a research fellow, Mr. Siklossy has in 2017 been nominated as the head of the Risk Assessment Division of NUBIKI Nuclear Safety Research Institute, a TSO in Hungary. As his primary research topic, he has been working in the field of level 1 PSA of natural external events, especially on meteorological events and river contamination. Moreover, he has also been involved in many different areas of PSA development as well as review.
Country: Hungary
Company: NUBIKI Kft.
Job Title: Head of Risk Assessment Division