Document: NUREG-0800
Document ID: 2a85a6b1-fab4-418e-bf66-475bfd506245
Document Type: srp
Title: Operating Basis Earthquake.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340591.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.7
CFR Part: 
CFR Title: 

Content:
In meeting the requirements of Reference 1, this subsection is acceptable when the vibratory ground motion for the OBE is described and the response spectrum (at appropriate damping values) at the site specified. Probability calculations (e.g., Refs. 41, 47, and 52) should be used to estimate the probability of exceeding the OBE during the operating life .of the plant. The maximum vibratory ground motion of the OBE should be at least one-half the maximum vibratory ground motion of the SSE unless a lower OBE can be justified on the basis of probability calcu- lations. It has been staff practice to accept the OBE if the return period is on the order of hundreds of years (e.g., Ref. 31). 2.5.2-8 Rev. 2 - August 1989 III. REVIEW PROCEDURES Upon receiving the applicant's SAR, an acceptance review is conducted to determine compliance with the investigative requirements of 10 CFR Part 100, Appendix A (Ref. 1). The reviewer also identifies any site-specific problems, the resolution of which could result in extended delays in completing the review. After SAR acceptance and docketing, those areas are identified where addi- tional information is required to determine the earthquake hazard. These are transmitted to the applicant as draft requests for additional informa- tion. A site visit may be conducted during which the reviewer inspects the geologic conditions at the site and region around the site as shown in outcrops, borings, geophysical data, trenches, and those geologic conditions exposed during construction if the review is for an operating license. The reviewer also discusses the questions with the applicant and his consultants so that it is clearly understood what additional information is required by the staff to continue the review. Following the site visit, a revised set of requests for additional information, including any additional questions that may have been developed during the site visit, is formally transmitted to the applicant. The reviewer evaluates the