Document: NUREG-0800
Document ID: 73bfb001-838f-4b48-a387-d3ef2ee987b5
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340616.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Mechanical Engineering Branch (MEB) Secondary - None I. AREAS OF REVIEW General Design Criterion 2 of 10 CFR Part 50, Appendix A, infpart, requires that structures, systems, and components important to safety be designed to withstand the effects of earthquakes without loss of capability to perform their safety functions. The earthquake for which these plant features are designed is defined as the safe shutdown earthquake (SSE) in 10 CFR Part 100, Appendix A. The SSE is based upon an evaluation of the maximum earthquake potential and is that earth- quake which produces the maximum vibratory ground motion for which structures, systems, and components important to safety are designed to remain functional. Those plant features that are designed to remain functional if an SSE occurs are designated seismic Category I in Regulatory Guide 1.29. The MEB reviews the seismic classification of those structures, systems, and components (including their foundations and supports) which are important to safety and are designed to withstand, without loss of function, the effects of a SSE and specified as seismic Category I by the applicant in his safety analysis report (SAR). This review which is coordinated with each branch that has primary review responsibility for these plant features is performed for both construction permit (CP) and operating license (OL) applications. The MEB review of seismic Category I items includes the following plant features: structures, dams, ponds, cooling towers, reactor internals, fluid systems important to safety that are identified in Regulatory Guide 1.26, ventilation systems, standby diesel generator auxiliary systems, fuel handling systems, and cranes. The applicant's proposed seismic classification may In part be presented in the form of a tablet which identifies those structures, systems and components that 'See Appendices C and D, SRP Section 3.2.2 - "System Quality Group Classification," for gudance. Rev. 1