Document: NUREG-0800
Document ID: 83897b75-c615-4927-a67e-da531e7cb01a
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A354.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
reductions than the specified limits if sufficient technical information is provided to support the larger reductions. The staff reviews and accepts the technical justifications for larger reductions on a case-by-case basis. 8. Enhanced SRP Section 3.7.2 II.8 “Interaction of Non-Category I Structures with Category I SSCs” by revising acceptance criteria related to Criterion C. The technical rationale 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-Category I structure to Category I SSCs. As an example, for a non-Category I structure in proximity to a Category I structure, the absolute sum of the seismic displacements of the two structures needs to 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 Category I structural design criteria to the non-Category I structure, in order to satisfy Criterion C. If there is an appreciable gap between the two structures, then a relaxation of Category I structural design criteria may be appropriate, provided it can be demonstrated that (1) the non-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