- USNRC Research & Regulatory Guidance for Soil-Structure Interaction
- H. Graves ; A. Kammerer ; V. Thomas
- Book Title / Journal: 4th U.S. - Japan Workshop on Soil-Strucutre Interaction, Tsukuba, Japan
- Year: 2007
- Soil Dynamics ; Geotechnical Earthquake Engineering
- Over the last three years, the U. S. Nuclear Regulatory Commission (NRC) has focused attention on soilstructure-interaction (SSI) issues in order to better understand emerging issues and to update its regulatory guidance in regards to SSI. NRC’s recent work is in advance of possible construction of new nuclear power plants (NPP) in the United States. Some conceptual designs for new NPP, also called advanced reactors, have proposed certain safety related NPP structures that will be partially or completely embedded below grade. In addition to this and other design features, some siting analyses for new NPP have used a performance-based method to determine the safe shutdown earthquake (SSE) ground motion. The performance-based method uses a target annual probability [e.g., 10-5 /year for the onset of significant inelastic deformation of systems, structures, and components] for the maximum acceptable facility damage from an earthquake. This paper presents some of the key areas that have been the focus of NRC activity over the last three years, namely: 1) the development of computational tools; 2) an assessment of deeply embedded structures and; 3) exploration of emerging issues; for example, performance-based methods and inclusion of seismic ground motion incoherency into SSI analyses.