1. NLSSI and Current Seismic R&D Justin Coleman, P.E. Nuclear Science and Technology Idaho National Laboratory October 7 th and 8 th, 2015

2. Objectives of Meeting Bring together group of leaders in site response and SSI analysis to: – Guide ongoing research and development activities – Encourage numerical commercial code development – Discuss requirements for updating codes and standards. Discuss opportunities for collaboration Organize a diverse skill set of team members 2

3. Objectives of October 7th Present ongoing research and development in: – NLSSI Methodology development – NLSSI application in SPRA’s – Experimental testing for validation Demonstrate UB structural dynamic capabilities for large scale validation tests in NQA-1 certified lab Receive input from attendee’s, steering and advisory panel members on: – Are we heading down the right path? – What experimental tests are needed to get advanced numerical tools and methods in codes and standards? 3

4. Steering and Advisory Committees Meeting Objectives for morning session on NLSSI R&D – Steering committee review NLSSI methodology development Committee members – Bob Kennedy – Farhang Ostadan – Greg Mertz – Mike Salmon – Andrew Whittaker – Advisory panel review of NLSSI implementation in SPRA’s Advisory panel members – Bob Kennedy – Nilesh Chokshi – Bob Budnitz 4 Action items from previous meetings – High frequency numerical noise – Investigate coefficient of restitution – Need experimental soil testing – Need a study to identify if hazard curve slope is too steep in advanced SPRA study

5. Team Collaborators 5

6. INL Seismic R&D Mission and Vision Manage seismic risk at nuclear facilities through cost effective analytical approaches and technologies Reduce uncertainty and quantify the safety margins at existing and new nuclear facilities. 6 VISION Verified and Validated advanced external hazard analysis tools and methods implemented in a comprehensive, risk-informed framework that provides best estimate nuclear facility response and economically ensures plant safety during and after beyond design basis events. VISION Verified and Validated advanced external hazard analysis tools and methods implemented in a comprehensive, risk-informed framework that provides best estimate nuclear facility response and economically ensures plant safety during and after beyond design basis events. Short Term Goal Integrate RD&D efforts and expertise to leverage current resources and ongoing R&D to create a unified methodology deployable in codes and standards Manage seismic risk at nuclear facilities through cost-effective, verified and validated analytical methods and tools Develop and deploy seismic risk management technologies, such as seismic isolation (SI) Medium - Long Term Goal Evaluate the performance of virtual nuclear power plants and nuclear facilities to a wide range of external hazards including multiple event scenarios. Allows nuclear facility owners to virtually test external hazards before the actual facilities are tested with actual hazards. Owners can then anticipate potential issues and resolve them

7. Long Term Goal 7

8. METHODS (Methods include acceptable numerical approaches and risk-informed evaluation approaches.) Nonlinear Soil Structure Interaction (NLSSI) Methodology Development (DOE NNSA and TerraPower) Method for Seismic Isolation of suspended components (DOE NNSA and TerraPower) Application of NLSSI into Seismic PRA’s (DOE-NE, LWRS) Identifying regulatory gaps associated with implementation of seismic isolation for advanced reactors (DOE-NE, Advanced Reactors) TOOLS (Tools development includes using and integrating existing numerical software and developing new software when necessary to support the methods.)(Numerical Software) Time integration calculation for solving structural dynamic problems (DOE- NE, LWRS) Tools for solving NLSSI problems (DOE-NE, LWRS) Tools for linking NLSSI with other external hazards (DOE-NE, LWRS) Stochastic 3D dynamic soil response during earthquake ground motions (LDRD) DATA (Data will be gathered and experimental tests run to validate the methods and tools. Data will be gathered from existing seismic and external hazard events at nuclear power plants. Experimental tests will be performed to provide validation data.) Methods and tools under development will be verified and validated using existing data and using the Experimental Research Group – External Hazards (ERG-EH) Large scale testing used to validate numerical models used in Seismic Isolation of large scale reactor systems (DOE NNSA and TerraPower) Validation of seismic wave propagation in soils. 1D Geotechnical laminar box testing at University at Buffalo (DOE-NNSA) Flooding tests (Oregon State University) Applications (Real world Nuclear Facilities and Power Plants used to test verified and validated methods and tools) Seismic and Flooding Multievent scenario at NPP with industry partners (DOE-NE, LWRS) Economics Study of seismic isolation of generic Nuclear Facility (DOE-AU) 8 Seismic R&D Activities