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EPRI Seismic Qualification Research Program

The utility industry, through the Seismic Qualification Utilities Group (SQUG), has accomplished a major stride toward the acceptance of the use of earthquake experience data as a basis for demonstrating the seismic adequacy of equipment in nuclear plants. The approach has been developed to address the seismic qualification issues raised by the U.S. Nuclear Regulatory Commission's Unresolved Safety Issue (USI) A-46. It appears that within limitations established by a third-party panel of experts the use of earthquake experience data is a technically acceptable generic alternative to the traditional practice of seismic qualification by piece-by-piece tests or analyses. Recognizing the great potential benefits of the experience-based generic qualification approach, the Electric Power Research Institute (EPRI) has established a research program with the main objective of providing utilities with additional data and methods to allow wider application of the experience approach to equipment in operating plants. As part of the EPRI Seismic Center, the seismic qualification program is also being used in the resolution of the Eastern U.S. seismicity issue.