Document: NUREG-0800
Document ID: 129133a3-2833-4da5-a564-052efbadbeb2
Document Type: srp
Title: but as applied to Category I subsystems.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070319.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
Design Criterion 2 requires, in relevant part, that SSCs important to safety be designed to withstand the effects of natural phenomena such as earthquakes, without loss of capability to perform their intended safety functions. GDC 2 further requires that the design bases reflect appropriate consideration for the most severe natural phenomena that DRAFT Rev. 3 - April 1996 3.7.3-8 have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated in the past. This SRP section reviews methods for seismic analysis and modeling of piping systems and components to assure that they accurately and/or conservatively represent the behavior of SSCs during postulated seismic events, thus assuring that GDC 2 is being met. Meeting the requirements of General Design Criterion 2 assures that fundamental safety functions, such as core cooling, are adequately protected, so that the plant can be safely brought to a shutdown condition following a seismic event. 2. Appendix A to 10 CFR 100 provides definitions for the OBE and the SSE and requires that the engineering methods used to ensure that the required safety functions are maintained during and after the vibratory ground motion associated with the SSE shall involve the use of either a suitable dynamic analysis or an appropriate qualification test methodology to demonstrate that all SSCs important to safety are capable of withstanding the seismic and other concurrent loads, including postulated accident loads, except where it can be demonstrated that the use of an equivalent static load analysis methodology provides adequate conservatism. The requirements of Appendix A to 10 CFR 100 assure that the applicable levels of vibratory ground motion corresponding to the OBE and the SSE are properly defined, and that adequate accuracy and/or conservatism are being applied in defining the system data being used