PSAM 16 Conference Paper Overview
Welcome to the PSAM 16 Conference paper and speaker overview page.
Lead Author: Albena Stoyanova Co-author(s): Olivier Nusbaumer (olivier.nusbaumer@kkl.ch)
Pavol Zvoncek (pavol.zvoncek@kkl.ch)
Devi Kompella (devi.kompella@relsafe.co.in)
Karthik Ravichandran (karthik.ravichandran@relsafe.co.in)
Rahul Agarwal (rahul.agarwal@relsafe.co.in)
| Seismically-induced Internal Fire and Flood (SIFF) Assessment at Leibstadt NPP, Switzerland |
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| Seismically induced secondary hazards such as seismically-induced fire and flood (SIFF) events have gained greater attention following major earthquakes like the Tōhoku and Virginia Earthquakes in 2011 and Kashiwazaki-Kariwa earthquake in 2007. Secondary hazards/effects proved to be of higher likelihood than originally assumed in the plant design basis. Different organizations like USNRC, EPRI, ASME, IAEA and WENRA worked to strengthen the requirements and methods for evaluating the protection against such hazards. The Swiss regulatory authority (ENSI) has also issued heightened requirements for seismic verification of existing Nuclear Power Plants (NPPs), mandating deterministic and probabilistic SIFF assessments. To fulfil ENSI requirements and to stay up-to-date with international developments, KKL performed a systematic and comprehensive assessment of SIFF events based on the state-of-the-art EPRI methodology (EPRI-3002012980), covering both deterministic and probabilistic aspects in an integrated manner. The main objectives of the project were to: (i) apply a robust, stage-wise, top-down screening process using qualitative and quantitative criteria (e.g. walkdown observations, seismic fragility estimates, risk measures); (ii) demonstrate the plant safe shutdown capability for unscreened SIFF events, if any; (iii) evaluate quantitatively the additional risk impact due to SIFF using PSA; and (iv) analyze the risk associated with explosive materials, seismic interactions and radiological aspects. The data and analysis from the latest fire and flood deterministic and probabilistic studies at KKL were used as a starting point in the project, including about 3800 potential fire ignition sources and 9100 flood sources. External experts were engaged for independent peer reviews, one of whom was a principal contributor to EPRI SIFF guidance (EPRI-3002012980). This paper describes the methods used and the insights gained from the SIFF study at KKL and depicts how a systematic top-down screening approach has proved to be effective and practical. It also discusses some relevant observations and recommendations for future similar industrial projects. |
Paper AL239 Preview
Author and Presentation Info
Lead Author Name: Albena Stoyanova (Albena.Stoyanova@kkl.ch)
Bio: Nuclear Engineer with 27 years wide range experience in International projects in different NPP and Waste management facilities (ref. Empressarios Agrupagos-Spain, Framatome-France, Atomenergoexport and Atomenergoproejekt-Russia, ONET Technologies-France, Parsons-Bulgaria, ANDRAD-Rumania etc). Born and educated in Bulgaria. Worked in Research&Design Institute "Energoproejekt" Bulgaria, Kozloduy NPP Bulgaria, ONET Technologies Bulgaria, Olkiluoto Unit 3 NPP Finland, Oskarshamn Unit 2 Sweden. Since 2019 in Leibstadt NPP Switzerland as PSA Specialist. Knowleadge and experience fields: – WWER / BWR / EPR technology; – Licensing of new NPPs (WWER in Bulgaria and EPR in Finland); – Deterministic and Probabilistic Safety Assessment of modernized and new NPP; – Design, Safety Assessment and Licensing of Waste Management Facilities; – Konfiguration and Project Management; – Environment Impact Analysis.
Country: Switzerland
Company: Leibstadt Nuclear Power Plant
Job Title: Specialist Probailistic Safety Assessment
Bio: Nuclear Engineer with 27 years wide range experience in International projects in different NPP and Waste management facilities (ref. Empressarios Agrupagos-Spain, Framatome-France, Atomenergoexport and Atomenergoproejekt-Russia, ONET Technologies-France, Parsons-Bulgaria, ANDRAD-Rumania etc). Born and educated in Bulgaria. Worked in Research&Design Institute "Energoproejekt" Bulgaria, Kozloduy NPP Bulgaria, ONET Technologies Bulgaria, Olkiluoto Unit 3 NPP Finland, Oskarshamn Unit 2 Sweden. Since 2019 in Leibstadt NPP Switzerland as PSA Specialist. Knowleadge and experience fields: – WWER / BWR / EPR technology; – Licensing of new NPPs (WWER in Bulgaria and EPR in Finland); – Deterministic and Probabilistic Safety Assessment of modernized and new NPP; – Design, Safety Assessment and Licensing of Waste Management Facilities; – Konfiguration and Project Management; – Environment Impact Analysis.
Country: Switzerland
Company: Leibstadt Nuclear Power Plant
Job Title: Specialist Probailistic Safety Assessment