(LLNL), Livermore, CA (United States) Electric Power Research Inst. of Engineering Technology Lawrence Livermore National Lab. Publication Date: Tue Apr 01 00:00: Research Org.: US Nuclear Regulatory Commission (NRC), Washington, DC (United States). Two entities are formally defined-the Technical Integrator (TI) and the Technical Facilitator Integrator (TFI)-to account for the various levels of complexity in the technical issues and different levels of efforts needed in a given study. The role of experts is analyzed in detail. Thus, in addition to more » providing a detailed documentation on state-of-the-art elements of a PSHA, this report provides a series of procedural recommendations. The Committee`s most important conclusion is that differences in PSHA results are due to procedural rather than technical differences. The SSHAC reviewed past studies, including the Lawrence Livermore National Laboratory and the EPRI landmark PSHA studies of the 1980`s and examined ways to improve on the present state-of-the-art. The project has been carried out by a seven-member Senior Seismic Hazard Analysis Committee (SSHAC) supported by a large number other experts. Department of Energy (DOE), and the Electric Power Research Institute (EPRI) co-sponsored a project to provide methodological guidance on how to perform a PSHA. Nuclear Regulatory Commission (NRC), the U.S. In order to review the present state-of-the-art and improve on the overall stability of the PSHA process, the U.S. This leads to disagreement among experts, which in the past has led to disagreement on the selection of ground motion for design at a given site. Due to large uncertainties in all the geosciences data and in their modeling, multiple model interpretations are often possible. Probabilistic Seismic Hazard Analysis (PSHA) is a methodology that estimates the likelihood that various levels of earthquake-caused ground motion will be exceeded at a given location in a given future time period.
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