Document: NUREG-0800
Document ID: 215ec1da-bdbb-48d3-b871-6010c1f4bc55
Document Type: srp
Title: SEISMIC SUBSYSTEM ANALYSIS REVIEW RESPONSIBILITIES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A239.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.3
CFR Part: 
CFR Title: 

Content:
3.7.2, Subsection II.13, are applicable. 3.7.3-6 Revision 4 – September 2013 6. Three Components of Design Ground Motion. The acceptance criteria provided in SRP Section 3.7.2, Subsection II.6, are applicable. 7. Combination of Modal Responses. The acceptance criteria provided in SRP Section 3.7.2, Subsection II.7, are applicable. 8. Interaction of Non-Seismic Category I Subsystems with Seismic Category I SSCs. To be acceptable, each non-seismic Category I subsystem should be designed to be isolated from any seismic Category I SSC by either a constraint or barrier, or should be remotely located with regard to the seismic Category I SSC. If this is not feasible or practical, then adjacent non-seismic Category I subsystems should be analyzed according to the same seismic criteria as applicable to the seismic Category I SSC. For non-seismic Category I subsystems attached to seismic Category I SSCs, the dynamic effects of the non-seismic Category I subsystems should be simulated in the modeling of the seismic Category I SSC. The attached non-seismic Category I subsystems, up to the first anchor beyond the interface, should also be designed in such a manner that during an earthquake of SSE intensity it will not cause a failure of the seismic Category I SSC. 9. Multiply-Supported Equipment and Components with Distinct Inputs. Equipment and components in some cases are supported at several points by either a single structure or two separate structures. The motions of the primary structure or structures at each of the support points may be quite different. A conservative and acceptable approach for analyzing equipment items supported at two or more locations is to define a uniform response spectrum (URS) that envelopes all of the individual response spectra at the various support locations. The URS is applied at all locations to calculate the maximum inertial responses of the equipment. This is referred to as the uniform support motion (USM) method. In addition, the