Document: NUREG-0800
Document ID: f5ba9b07-c36e-4c99-a4af-50271ed55f35
Document Type: srp
Title: SURFACE FAULTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340599.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.3
CFR Part: 
CFR Title: 

Content:
s acceptable if all historically reported earthquakes within 5 miles of the site or near faults which trend within 5 miles of the site, as discussed in SRP Section 2.5.2, are evaluated with respect to hypocenter accuracy and source origin. In conjunction with these discussions, a plot of the earth- quake epicenters superimposed on a map showing the local tectonic structures as defined in SRP Section 2.5.1 should be provided. Hypocentral error estimates of the earthquakes should be shown. Subsection 2.5.3.4. In meeting the requirements of References 1 and 3, this subsection is acceptable when every fault, any part of which is within 5 miles of the site, is investigated in sufficient detail using geological and geo- physical techniques of sufficient sensitivity to demonstrate the age of most recent movement (Ref. 16). An evaluation of the sensitivity and resolution of the exploratory techniques used should be given. Subsection 2.5.3.5. In meeting the requirements of References 1, 2, and 3, this subsection is acceptable when a discussion is given of the structural and I genetic relationship. between site area faulting and the regional tectonic frame- work. In regions of active tectonism it may be necessary to conduct detailed geologic and geophysical investigations to demonstrate the structural relation- ships of site area faults to regional faults known to be seismically active. Both a theoretical and an observational basis for the conclusions reached should be given. Subsection 2.5.3.6. In meeting the requirements of References 1, 2, and 3, this subsection is acceptable when it has been demonstrated that the investi- gative techniques used have sufficient sensitivity to identify all faults greater than 1000 feet in length within 5 miles of the site and when the geometry, length, sense of movement, amount of offset, age of latest movement, and limits of the fault zone are given for each fault. Investigations are to extend at least 5 miles beyond all plant sites