Document: NUREG-0800
Document ID: a8564bea-31bf-4592-ba45-e92b53d2d706
Document Type: srp
Title: SEISMIC SUBSYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340570.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.3
CFR Part: 
CFR Title: 

Content:
the support structure. Use of equip- ment frequencies within this range is acceptable if the equipment is adequately designed for the applicable loads. 5. Analysis Procedure for Dampinq The acceptance criteria provided in SRP Section 3.7.2, subsection II.13, are applicable. 6. Three Components of Earthquake 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 Other Systems With Category I Systems To be acceptable, each non-Category I system should be designed to be isolated from any Category I system by either a constraint or barrier, or should be remotely located with regard to the seismic Category I system. If it is not feasible or practical to isolate the Category I system, adjacent non-Category I systems should be analyzed according to the same seismic criteria as applicable to the Category I system. For non-Category I systems attached to Cate- gory I systems, the dynamic effects of the non-Category I systems should be simulated in the modeling of the Category I system. The attached non-Category I systems, 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 Cate- gory I system. 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 equipment items supported at two or more locations is to use an upper bound envelope of all the individual response spectra for these locations to calculate maximum inertial responses of multiply-supported items. In addi- tion, the relative displacements at the