Document: NRC Regulatory Guide
Document ID: 111e064c-2d28-4647-872a-806b29019408
Document Type: regulatory_guide
Title: Design Limit and Loading Combinations for Seismic Category I Fluid System Components
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A124.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.48
CFR Part: 
CFR Title: 

Content:
primary membrane stress; ob = primary bending stress; S = allowable stress value as specified in Appendix I of Section III of the ASME Boiler and Pressure Vessel Code. " For the loadings designated in regulatory position 8.a.(2), onlyequation 9 of NC-3651 need be met. ''In addition to compliance with the design limits q specified, assurance of operability under all design loading combinations should be provided by any appropriate combination of the following suggested measures: a. in situ testing (e.g., preoperational testing after the component is installed in the plant). b. full-scale prototype testing. c. reduced-scale prototype testing. d. detailed stress and deformation analyses (includes experimental stress and deformation analyses). In the performance of tests or analyses to demonstrate operability, the structural interaction of the entire assembly (e.g., valve-operator and pump-motor assembly) should be considered. If superposition of test results for other than the combined loading condition is proposed, the applicability of such a procedure should be demonstrated. The design limits for non-active pumps and valves may be used for the applicable loading combinations if appropriate analyses and/or testing cooifirms that operability is not impaired when designed to these limits. 1.48-8