1. Role of the TSO in Public Information/ Debate Openness, Transparency Technical support to regulatory body for the new NPP (OL3) project
Keijo Valtonen
International Conference on the Challenges Faced by Technical and Scientific Support Organizations in Enhancing Nuclear Safety
Aix-en-Provence

2. Olkiluoto 3 licensing phases
Operating License
2008
Construction
Construction Permit
Technical part
Preparatory phase
Political part
Decision in Principle
Feasibility study
Environmental Impact
Assessment
PVM/NN

3. TSO Support at Olkiluoto 3 Review Stakeholders involved in the licensing
PVM/NN

4. TSO Support at Olkiluoto 3 Review
Criteria for TSO’s;
Competent organisation to carry out EPR analysis
Independent from the licensee
Codes independent from the licensee’s codes
Adequately validated safety codes for EPR
Main TSO which were used in OL3 licensing was
Technical Research Centre of Finland (VTT)
Other TSOs
Lappeenranta Technical University
Institute for Safety and Reliability (ISar)
Gesellschaft fur Anlagen und Reaktorsicherheit (GRS)
Codes used by TSO’s
TRAB3D/SMABRE (VTT)
APROS (VTT)
ATHLET (ISar)
PVM/NN

5. TSO Support at Olkiluoto 3 Review
VTT:
Anticipated operational transients and accident analyses (DBC 2, 3, 4) with the TRAB3D/SMABRE code
Main steam line break
Loss of offsite power
Main coolant pump seizure
ATWS
Accident analyses (DBC 3 and 4) with the APROS and TRAB3D/SMabre codes
Independent comparative analyses of primary circuit behaviour during accident situations.
Small break LOCA
Steam Generator Tube Rupture
Large break LOCA
Feedwater line break
Independent comparative analyses of containment behaviour during accident situations
EPR/OL3 - APROS simulation of containment behaviour during main steam line break and large break LOCAs
PVM/NN

6. TSO Support at Olkiluoto 3 Review
Severe Accident analyses with the MELCOR and GEMINI2 codes
EPR/FIN5 - Station blackout analyses with MELCOR 1.8.5
EPR/FIN5 - Large break LOCA analyses with MELCOR 1.8.5
Severe accident analyses of EPR/FIN5
Erosion of sacrificial concrete in the dry cavity of EPR/FIN5
Fire safety
Experiments (cables) and review
PVM/NN

7. TSO Support at Olkiluoto 3 Review
Primary circuit design: strength analysis, review of manufacturing technology
Evaluation of the welding preheat and work temperatures and associated heat treatments for a few reactor pressure vessel and steam generator forgings.
Comments on the Expediency of the Welding Procedure Qualification Test Specification for Safe End Welding
Comments on the Expediency of the Document 'Dissimilar Metal Narrow Gap TIG Welds with Nickel-Base Alloy 52 - Manufacturing and Material Properties (NFPMT DC 1080, Rev.C)'
Evaluation of OL 3 quality requirement procedures of following specifications: ASME-QR-NDT-2102, ASME-QR-NDT-2108, ASME-QR-NDT-2110, ASME-QR-NDT-2114, ASME-QR-NDT-2200, ASME-QR-NDT-2201 and ASME-QR-NDT-2231
Evaluation of OL 3 quality requirement procedures of specifications listed in section 1
Final Comments on the Expediency of the Document 'Dissimilar Metal Narrow Gap TIG Welds with Nickel-Base Alloy 52 - Manufacturing and Material Properties (NFPMT DC 1080, Rev. C)
OL3 Inspection guidelines for forgings
Statement on analysis data for a few forgings.
PVM/NN

8. TSO Support at Olkiluoto 3 Review
Review of design phase PSA
Risk-informed review of safety classes of OL3, design phase
Review of HRA for OL3-PSA
Analysis of airplane crashes
Operation of emergency diesel generators after an aircraft crash.
Short-term combustion of jet fuel after an aircraft crash.
Olkiluoto 3 NPP Aircraft Crashes
OL3 - Primary circuit water chemistry
Literature survey of primary side water chemistry aspects for OL3 nuclear power plant
PVM/NN

9. TSO Support at Olkiluoto 3 Review Finnish organisations
Lappeenranta University:
Experiments on core melt coolability
PVM/NN

10. TSO Support at Olkiluoto 3 Review European organisations
Gesellschaft fur Anlagen und Reaktorsicherheit (GRS)
Break Preclusion Concept
Airplane crashes
Institute for Safety and Reliability (ISar)
Transient and Design Basis Accident analyses with the ATHLET code
Preparation and Qualification of Basic ATHLET Input Deck for the Finnish EPR (Olkiluoto-3).
SB LOCA Boron Dilution Analysis for the Finnish EPR (Olkiluoto-3)
ATWS Analyses for the Finnish EPR Olkiluoto-3.
Evaluation of the Effectiveness of the Emergency Core Cooling System (ECCS) of EPR and Comparison of the Effectiveness of ECCS between EPR and the Convoy Plants
PVM/NN

11. TSO Support at Olkiluoto 3 Review European organisations
2A LOCA Analyses for the Finnish EPR Olkiluoto-3.
Calculation of the SGTR at full Power (2 U-tubes with Coincident LOOP) for the Finnish EPR (Olkiluoto-3)
Calculation of the SGTR at Hot Zero Power (2 U-tubes break at 2% Reactor Power) for the Finnish EPR (Olkiluoto-3)
DGSNR and IRSN France
Exchange of information on the Finnish and French EPR design topics
PVM/NN