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:
s per earthquake may be assumed. 3. Procedures Used for Analytical Modeling The acceptance criteria provided in SRP Section 3.7.2, subsection II.3, are applicable. DRAFT Rev. 3 - April 1996 3.7.3-4 4. Basis for Selection of Frequencies To avoid resonance, the fundamental frequencies of components and equipment should preferably be selected to be less than 1/2 or more than twice the dominant frequencies of the support structure. Use of equipment frequencies within this range is acceptable if the equipment is adequately designed for the applicable loads. 5. Analysis Procedure for Damping 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 Category 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 Category I system. The acceptance criteria provided in SRP Section 3.7.2, subsection II.8, are applicable to all seismic Category I SSCs at the system and subsystem level.12 9. Multiply-Supported Equipment and Components