Document: NUREG-0800
Document ID: c12e6057-2586-4b17-91eb-dad71349982d
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A223.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
e for this change is as follows. The objective of Criterion C is to demonstrate that failure under SSE conditions will be prevented. What constitutes “failure” is dependent on the proximity of the non-seismic Category I structure to seismic Category I SSCs. As an example, for a non-seismic Category I structure in proximity to a seismic Category I structure, the absolute sum of the seismic displacements of the two structures should be less than the as-designed gap between the structures for the entire height of the structures, in order to satisfy criterion C. If the structures are in very close proximity, it may be necessary to apply seismic Category I structural design criteria to the non-seismic Category I structure, in order to satisfy Criterion C. If there is an appreciable gap between the two structures, then a relaxation of seismic Category I structural design criteria may be appropriate, provided it can be demonstrated that (1) the non-seismic Category I structure is in a stable limit state (no gross failure), and (2) the as-designed gap (considering construction tolerances) between the structures is large enough to accommodate the absolute sum of the seismic displacements of the two structures. The ASCE 43-05 standard presents a graded approach to design/analysis of structures for loading combinations that include seismic loads. In accordance with ASCE 43-05, nuclear seismic Category I structures require the most stringent design criteria; namely, a linear elastic limit state. This is consistent with NRC guidance for design/analysis of