Modifications of the document Version Date Authors Pages or paragraphs modified Description or comments Rev. 0 15/09/2014 Wielenberg All Initial version Rev.1 21/04/2015 Wielenberg (ed.) All Garching workshop version Rev 2 09/07/2015 Wielenberg (ed.) Sections 3 to 6 Additions to section 3, draft of section 4, partial draft of section 5 and 6. Rev. 3 21/09/2015 Wielenberg (ed.) Sections 3 to 6 Multi-unit considerations, diverse edits and inclusion of contributions Rev. 4 16/10/2015 Wielenberg (ed.) Section 5.3, 6 Integration of several contributions Rev. 5 23/10/2015 Wielenberg (ed.) Section 5.4, 5.5 Integration of contribution on IE identification Rev. 6 Wielenberg (ed) Section 5.3, 7 Treated comments by NUBIKI, Glossary Rev. 7 16/02/2016 E. Raimond All Report simplification. All initial ideas are kept. Rev. 8 09/03/2016 Hage, Hashimoto, Wielenberg Further development of simplified report. Rev. 9 20/03/2016 E. Raimond, H. Loeffler, M. Hage Section 6 Modifications review Rev. 10 20/04/2016 H. Löffler exec. summary, NRC contribution Editorial updates in all sections Rev. 11 05/05/2016 E. Raimond Section 5.1.3 and 5.2.11 Final format Rev 12 10/05/2016 P. Brac, R. Albuzas, F. Godefroy, E. Raimond , H. Löffler, Sections 5.2.6, 5.2.11, 5.2.23 Complements on national activities. References in report. Rev. 13 15/10/2016 A. Prošek (ed.) All External review version for ASAMPSA_E Final End-Users Workshop (TRACTEBEL, IRSN, JANSI, LEI, ENSI, EDF) + JSI 19/10/2016 H. Löffler summary, sect 6 and 7 introduce responsibility of authorities in screening approach Final 13/12/2016 A. Prošek, H. Löffler, A. Wielenberg All Final consideration of comments and final edits 27/01/2017 E. Raimond Few Editorial modification List of diffusion
European Commission (Scientific Officer) Name First name Organization Passalacqua Roberto EC ASAMPSA_E Project management group (PMG) Name First name Organization Raimond Emmanuel IRSN Project coordinator Guigueno Yves IRSN WP10 coordinator Decker Kurt Vienna University WP21 coordinator Klug Joakim LRC WP22 coordinator until 2015-10-31 Kumar Manorma LRC WP22 coordinator after 2015-10-31 Wielenberg Andreas GRS WP30 coordinator until 2016-03-31 Löffler Horst GRS WP40 coordinator WP30 coordinator after 2016-04-01
with the responsible authorities to be effective enough to be able to identify rapidly predominant hazards eligible for extended PSA analysis. The concluding section of the report provides summaries and recommendations on: the main qualitative and quantitative screening criteria, the structure of the screening process, the PSA quality, the transition from rough screening towards detailed PSA models, the link with the situations that should be practically eliminated. ASAMPSA_E 1 Institute for Radiological Protection and Nuclear Safety IRSN France 2 Gesellschaft für Anlagen- und Reaktorsicherheit mbH GRS Germany 3 AMEC NNC Limited AMEC NNC 4 Ricerca sul Sistema Energetico RSE S.p.A. 5 Lloyd's Register Consulting LRC Sweden 6 Nuclear Research Institute Rez pl UJV Czech 7 Universität Wien UNIVIE Austria 8 Cazzoli Consulting CCA Switzerland 9 Italian National Agency for New Technologies, Energy and the Sustainable Economic Development ENEA Italy 10 Nuclear Research and consultancy Group NRG Nederland 11 IBERDROLA Ingeniería y Construcción S.A.U IEC Spain Kingdom
12 Electricité de France EDF France 13 Lietuvos energetikos institutas (Lithuanian Energy Institute) LEI Lithuania 14 NUBIKI NUBIKI Hungary 15 Forsmark kraftgrupp AB FKA Sweden 16 NP SAS France AREVA NP SAS France 17 NCBJ Institute NCBJ Poland 18 State Scientific and Technical Center for Nuclear and Radiation Safety” SSTC Ukraine 19 VUJE VUJE Slovakia 20 NIER Ingegneria NIER Italy 22 TRACTEBEL ENGINEERING S.A. TRACTEBEL Belgium 23 BeL V BeL V Belgium 24 Institut Jozef Stefan JSI Slovenia 25 Institute of nuclear research and nuclear energy – Bulgarian Academia of science Bulgaria 26 Autonoma Pentru Activatati Nucleare Droberta Tr. Severin RA Suc INR Roumania 27 Technical University of Sofia – Research and Development Sector TUS Bulgaria 28 AREXIS S.A.R.L. AREXIS France 29 United States Nuclear Regulatory Commission US-NRC US 30 Tokyo Electric Power Company TEPCO 31 Japan Nuclear Safety Institute JANSI Japan
Table 54 Screening criteria for single external events: C1/Severity Site-related screening criteria C2/Frequency Site-related screening criteria C3/Distance Site-related screening criteria C4/Inclusion Impact screening criteria C5/Warning Impact screening criteria C6/Applicability Screened-out if: The event has a damage potential that is less or equal to another event that the plant is already dimensioned for. Screened-out if: The event has a considerably lower frequency of occurrence than events with similar uncertainties and cannot result in worse consequences. Screened-out if: The event cannot occur close enough to the plant to affect it. Screened-out if: The event can be included in the definition of another event. Screened-out if: The event develops in such a slow rate that there is enough time to initiate counteractions. Screened-out if: The event is not applicable to the site because of other reasons. Screening Criteria for Multiple External Events A combination of external events is considered to be relevant if the combination has more severe or additional effects on the compared to those of the initial single external event. In to arrive at a manageable amount of potential combined external events, the following screening criteria are used based on reference [71]: Table 55 Screening criteria for multiple external events: M1 / Definition M2 / Independence M3 / Impact C1 – C6 Screened-out if: The multiple events are included in the definition of a single event, which is already analysed for the plant Screened-out if: The events occur independently of each other in time AND The probability of simultaneous occurrence is low, i.e., below single event frequency screening criteria C2 Screened-out if: The events do not independently in time (see criterion M2) AND The events affect the same plant safety function AND The combined effect on the safety function is not greater than the effect from the most severe of the single events involved Screened-out if: Any of the single external events criteria apply to the potential multiple events