U.S. Nuclear Regulatory Commission Staff Technical Position on Investigations to Identify Fault Displacement Hazards and Seismic Hazards at a Geologic Repository

by Keith I. McConnell, U.S. Nuclear Regulatory Commission, Washington, United States,
Abou-Bakr K. Ibrahim, U.S. Nuclear Regulatory Commission, Washington, United States,
Philip S. Justus, U.S. Nuclear Regulatory Commission, Washington, United States,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993


This paper outlines the guidance provided to the U.S. Department of Energy by the Nuclear Regulatory Commission (NRC) staff in its Staff Technical Position (STP) on appropriate investigations that can be used to identify fault displacement hazards and seismic hazards at a geologic repository. The STP defines an acceptable approach to the identification and investigation of fault displacement hazards, which in turn leads to the identification of three types of faults: Type III faults - need not be investigated in detail; Type II faults - candidates for detailed investigation; Type I faults - should be investigated in detail because they are subject to displacement and are of sufficient length and located such that they may affect repository design and/or performance or could provide significant input into models used to assess repository performance. The STP also describes an acceptable approach to conducting investigations to provide input for the analysis of vibratory ground motion with emphasis on those earthquakes that could generate the equivalent of .1g or greater ground acceleration at the location of the controlled area.

Subject Headings: Geohazards | Public health and safety | Ground motion | Federal government | Subsurface investigation | Geological faults | Displacement (mechanics) | Seismic tests

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