Document: NUREG-0800
Document ID: 228b9b6e-c81e-4d76-9b8e-12f6c3bd7fa1
Document Type: srp
Title: and Regulatory Guide 1.92,(Reference 10) "Combining Modal Responses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070336.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
during startup and initial operation on specified high-and moderate-energy piping, and all associated systems, restraints and supports. The tests provide adequate assurance that the piping and piping restraints of the system have been designed to withstand vibrational dynamic effects due to valve closures, pump trips, and other operating modes associated with the design basis flow conditions. In addition, the tests provide assurance that adequate clearances and free movement of snubbers exist for unrestrained thermal movement of piping and supports during normal system heatup and cooldown operations. The planned tests will develop loads similar to those experienced during reactor operation. 2. The applicant has met the relevant requirements of General Design Criteria 2 with respect to demonstrating design adequacy of all Category I systems, components, equipment and their supports to withstand earthquakes by meeting the relevant acceptance criteria of SRP Sections 3.7.2 and 3.7.3 including the applicable regulatory positions of Regulatory Guides 1.61 (or ASME Code Case N-411 as supplemented by the DRAFT Rev. 3 - April 1996 3.9.2-26 regulatory position of Regulatory Guide 1.84) and 1.92 and by providing an acceptable 65 seismic systems analysis procedure and criteria. The scope of review of the seismic system analysis included the seismic analysis methods of all Category I systems, components, equipment and their supports. It included review of procedures for modeling, inclusion of torsional effects, seismic analysis of Category I piping systems, seismic analysis of multiply supported equipment and components with distinct inputs, justification for the use of constant vertical static factors and determination of composite damping. The review has included design criteria and procedures for evaluation of the interaction of non-Category I piping with Category I piping. The review has also included criteria and seismic analysis procedures for reactor internals and