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Integrating SSHAC Guidelines in NGA-East Seismic Hazard Assessments for Nuclear Facilities

This document outlines the incorporation of the SSHAC guidelines into the NGA-East project to assess seismic hazards in the Central and Eastern U.S. It emphasizes methodologies for source characterization and ground motion prediction equations in probabilistic seismic hazard analysis (PSHA). Key objectives include engaging the informed technical community, capturing diverse expert opinions, and addressing uncertainties for improved regulatory processes. The framework supports collaboration among evaluators, resource experts, and normative experts to enhance the reliability of seismic assessments crucial for nuclear infrastructure.

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Integrating SSHAC Guidelines in NGA-East Seismic Hazard Assessments for Nuclear Facilities

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  1. SSHAC Guidelines in NGA-East Project Dr. Annie Kammerer, P.E. (Most slides borrowed from Dr. Kevin Coppersmith) NGA-East Sigma Workshop Organizational Meeting

  2. US NRC Projects to Assess Seismic Hazard in CEUS Central and Eastern US Seismic Source Characterization project for Nuclear Facilities (CEUS SSC) Next Generation Attenuation Relationships for the Central and Eastern (NGA-East) Recommendations for Application of the SSHAC Guidelines Source Characterization Ground motion prediction equations Framework for large PSHA studies

  3. Background • NUREG/CR-6372, “Recommendations for Probabilistic Seismic Hazard Analysis: Guidance on Uncertainty and Use of Experts” • Framework for integration of expert assessments and treatment of uncertainties • CEUS SSC Project SSHAC level 3 • Need to consider how NGA-East can incorporate the SSHAC guidelines

  4. Goal • To capture the center, body, and range of views of the invormed technical community • Broadens ownership • Increases assurance that uncertainties have been captured • Can be peer reviewed by those with comparable knowledge of the community

  5. Motivation • Differences in results of EPRI and LLNL PSHA lead to understanding of approach to conduct of study • Consideration of alternate interpretations creates a more stable regulatory process and increased acceptance of outcomes • Range of opinion believed to provide more stable estimates

  6. Two important activities • Evaluation • Identification of important data • Interaction among experts • Consideration and weighting of proponent viewpoints • Integration • Represent the informed technical community • Use expert assessments

  7. Roles • Expert roles • Evaluator expert • Resource expert • Proponent expert • Normative expert • Technical integrator or Technical faciliatator/integrator • Participatory peer review panel

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