Document: NUREG-0800
Document ID: 7d53889c-d236-4e84-9579-a2beb4716167
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070296.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
plicant has indicated compliance with Regulatory Guides 1.29, 1.143 and 1.151 in the SAR. Where there are differences with respect 41 to the Guides, these differences should be identified. For General Electric BWR/6 main steam lines and main feedwater lines, an acceptable alternate seismic classification to that currently specified in Position C.1.e of Regulatory Guide 1.29, is provided in Figure B-1 attached to Appendix B of SRP Section 3.2.2.42 The information in the SAR identifying seismic Category I structures, systems, and componentsSSCs is reviewed for completeness and to assure there is sufficient detail to permit 43 identification of specific items. This may include a review of the SAR text, tables, plot plans, general arrangement drawings, structural drawings, and piping and instrumentation diagrams, as appropriate. Where portions of a system are classified seismic Category I, the boundary limits of that portion of the system designed to Category I requirements is are reviewed on the piping 44 and instrumentation diagrams. For fluid systems which are partially seismic Category I, the Category I portion of the system should extend to the first seismic restraint beyond the isolation valves which isolate that part which is seismic Category I from the non-seismic portion of the system. At the interface between seismic and non-seismic Category I piping systems, the seismic Category I dynamic analysis will be extended to either the first anchor point in the non-seismic system or to sufficient distance in the non-seismic system so as not to degrade the validity of the seismic Category I analysis. In addition, where portions of a structure are 45 classified seismic Category I, those portions of the building foundations and supports designed to Category I requirements are identified on the plant arrangement drawings. The interfaces between components and associated support structures designed to seismic Category I requirements are then checked to assure