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LICENSING PROCESS FOR BELENE NPP: CURRENT STATUS AND NEXT STEPS Tinko Ganchev Head of Department Bulgarian Nuclear Regulatory Agency. Content of the presentation. Introduction 2. Legal requirements on licensing and safety assessment 3. Regulatory review of Belene NPP TD, ISAR and PSA

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  1. LICENSING PROCESS FOR BELENE NPP:CURRENT STATUS AND NEXT STEPSTinko GanchevHead of DepartmentBulgarian Nuclear Regulatory Agency Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  2. Content of the presentation • Introduction 2. Legal requirements on licensing and safety assessment 3. Regulatory review of Belene NPP TD, ISAR and PSA 4. Additional analyses and discussions of selected safety issues Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  3. 1. Introduction Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  4. Main Advantages of AES-92 Design- Generation III LWR •Provision of a “core catcher” for severe accident cases, leading to a core melting and reactor pressure vessel breach • Long design operation life time: 60 provisional years of operation • Substantial reduction of core damage frequency : ~10 -7/y Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  5. Main Advantages of AES-92 Design- Generation III LWR • Two individual completely independent reactivity control systems • Redundancy for all safety functions provided by the use of both active and passive safety systems • Use of a special double containment, designed to withstand a large range of internal and external events Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  6. 2. Legal requirements on licensing and safety assessment Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  7. Legislation applied to licensing new nuclear facility • Primary legislation • EU legislation, Conventions, Constitution of the Republic of Bulgaria • Act of the Safe Use of Nuclear Energy (Nuclear Act) • Energy Act • Environment Protection Act • Act on the Territorial Structure • Secondary legislation - 22 regulations for the application of the Nuclear Act Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  8. Nuclear Act: Types of Authorisations • permit for site selection • order for approval of the selected site • permit for design • order for approval of the technical design • permit for construction • permit for commissioning • licence for operation • licence for decommissioning Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  9. Main NRA regulations applied during licensing • Regulation for the procedure for issuing licenses and permits for safe use of nuclear energy (2004) • Regulation on ensuring the safety of nuclear power plants (2004) • Regulation on basic norms of radiation protection (2004) • Other relevant regulations issued under the Nuclear Act Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  10. Regulation on Ensuring the Safety of NPPs Design limits and safety assessment • Acceptance criteria for the barriers; • Radiological and other technical acceptance criteria • Frequency of a large radioactive release into the environment that requires undertaking of immediate protective measures for the population shall not exceed 1E-6 events per NPP per year. Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  11. Regulation on Ensuring the Safety of NPPs: Safety Analysis and Assessment • Plant safety shall be analyzed using deterministic and probabilistic methods to verify and confirm the established design basis and the effectiveness of defense in depth arrangement • Postulated initiating events (PIEs) shall be also analyzed • Computer codes, analytical methods and plant models to be used in the safety analysis shall be verified and validated, uncertainty of the results shall be quantified Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  12. Safety Margins and Uncertainty Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  13. Examples of international safety and reliability criteria Probabilistic Safety Criteria of European Utilities (EUR): more restrictive than the criteria of the IAEA EUR Probabilistic Safety Targets: - Core damage frequency: CDF<1 E-5 - Frequency of release>limited impact (LI): 1 E-6 - Early or large release frequency (ELRF): 1 E-7 IAEA Probabilistic Safety Targets for future plants (INSAG 3, 1999) - CDF: 1E-5 per reactor year - LRF: 1E-6 per reactor year Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  14. 3. Regulatory review of TD, ISAR and PSA for Belene NPP Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  15. Current Licensing Status April 2008 Application forDesign Approval Review and Assessment of Submitted Documentation Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  16. Main documents subject to assessment Technical Design (TD) Interim Safety Ananalysis Report (ISAR) Probabilistic Safety Analysis (PSA) -Amount of the technical documents submitted: > 30 000 pages Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  17. BNRA review and assessment process: • Internal expert opinion • Within the BNRA frames • According to approved program - stages, experts, terms • Review and assessment by consultants • ISAR– RiskauditInternational (GRS & IRSN) • Chosen technical designsolutions – • EnproConsult Ltd. • PSA - IAEAin the frame of national TC project Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  18. Review and assessment of the ISAR (Rev.0) • In-depth analyses of selected safety issues by Riskaudit • Large Break Loss of Coolant Accident (LOCA) Study • Core-Catcher Features and Performance Investigation • 3. Coupled ATHLET-COCOSYS analysis for a BDBA LOCA DN80 • 4. ATHLET BDBA analysis Small break DN80 and total loss of power for 24 hours • 5. COCOSYS accident analyses for NPP Belene • 6. Structure mechanical analyses of the containment behavior • 7. Analysis of the resolution of the IAEA Safety Issues for WWER-1000/V-320 Nuclear Power Plants for Belene NPP Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  19. Results from the review of TD and ISAR (Rev. 0) • Total amount of experts’ report – 1000 pages • There are no issues that could not be resolved • Classification of the Review 2008-2009 • recommendations : • Class 1 – essential for safety “Must do” • Class 2 – having an effect on safety “Should do” • Class 3 – without significant effect on safety “Nice to have” Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  20. Review and assessment of the Technical Design EnproConsult Task: Review and assessment of chosen design solutions • Geotechnical issues • Primary circuit • Hermetic construction • Safety related I&C systems (including software) • Control Systems • Systems for management of severe accidents • Reliability of chosen main structures • Analysis of the fire risk and protection measures • Analysis of the measures for ensuing seismic safety • Measuresfor ensuring radiation protection Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  21. Review and assessment of TDand ISAR – Rev.2 New contracts with Riskaudit and EnproConsult signed in May – July 2010 Task 1:Review and assessment of the Revision 2 of TD and ISAR Task 2:Performance of part 2 of research oriented activities and generic oriented in-depth studies for selected safety issues and accident scenarios identified in the course of TD and ISAR review with a special focus on the novel passive safety systems Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  22. Review and Assessment of the PSA National TC project supported by the IAEA Assessment of PSA: • Preliminary Mission – February 2009 • IPSART Mission for assessment of PSARev. 0 - May 2009. Final Report-August 2009 • Follow-up IPSART Mission, PSA Rev. 2 - October 2010. Final Report - February 2011 Importance ranking of findings: - “HIGH” - “MEDIUM” - “LOW” - “N/A” Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  23. Review and Assessment of the PSA Conclusions of the PSA review: • Large number of findings of the IPSART Mission has been resolved in the PSA Report Rev.2 • Some of the PSA issues can only be resolved during the detailed design stage when the required details will be known and available Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  24. 4. Additional analyses and discussions of selected safety issues Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  25. BNRA internal review of consultants’ recommendations High level decision-making group has been created in the BNRA: Task:To review and assess all the recommendations made by the BNRA experts and by the consultants and to take a decision about their importance for the current licensing stage - approval of the design Results:Class 1 recommendations (must be resolved before approval of the plant design): • RiskAudit – 83 • EnproConsult – 31 • Total – 114 List of missing Topical reports has been prepared Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  26. NRA internal review of consultants’ recommendations Further analyses and discussions needed: Novel passive safety systems: -Molten Core Retention System (“Core catcher”); - Passive secondary Heat Removal System (PHRS); - Quick Boron Injection System (QBIS) - Containment structure and PHRS - airplane crash impact Dual use of some systems for normal operation Systems and components classification Submission of additional Topical reports Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  27. EU (ENSREG) “Stress tests” analysis of Belene NPP “Stress test”: targeted reassessment of the safety margins of NPPs. Technical scope: a) Initiating events:earthquake; flooding; b) Consequence of loss of safety functions from any initiating event:loss of electric power, including station black out; loss of ultimate heat sink; combination of both; c) Severe accident management issues:loss of core cooling function; loss of the cooling function of the fuel storage pool; loss of containment integrity Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  28. EU (ENSREG) “Stress tests” analysis of Belene NPP Timeframe: • The final National report will be subject to a peer review process • The EC will present a progress report to the EU Council for the meeting scheduled on 9th December 2011 and a consolidated report for the meeting scheduled for June 2012. Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

  29. Operating License Commissioning permit Construction permit Design approval order Next licensing steps Bulatom Annual Forum, Bulgaria, Varna - Riviera, 2-4 June 2011

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