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:
the component iý subjected to either (1) concurrent loadings associated with either the normal plant condition or the upset plant condition and the' vibratory motion of 50 percent of the SSE, or (2) loadings associated with the emergency plant condition, or (3) concurrent loadings associated with the niormal' plant condition, the vibratory motion of the SSE, and' the dynamic system loadings associated with the faulted' plant condition. 6. ASME Code Class 2 and 3 vessels 'designed to. Division 1 of Section VIII of the ASME Code: a. The allowable stress value S9 should not be exceeded by, more than 10 percent when the component is subjected to either (1) concurrent loadings associated. with either the normal plant condition or the upset plant condition and the vibratory motion of 50 percent of the.. SSE, or (2) loadings associated with the emergency plant condition. b. S should not be exceeded by more than 50 percent when the component is subjected to concurrent loadings associated with the normal plant condition, the vibratory motion of the SSE, and the dynamic system loadings associated with the faulted plant condition. 7. ASME Code Class 2 vessels designed to Division 2 of Section VIII of the ASME Code: a. The design limits specified in NB-3223 of the ASME Code should not be exceeded when the component is subjected to concurrent loadings associated with either the normal plant condition or the upset plant condition and the vibratory motion of 50 percent of the SSE. 1.48-5 b. The design limits specified in NB-3224 of the ASME Code should not be exceeded when the component is subjected to loadings associated with the emergency plant condition. c. The design limits specified in NB-3225 of the ASME Code should not be exceeded when the component is subjected to concurrent loadings associated with the normal plant condition, the vibratory motion of the SSE, and the dynamic system loadings associated with the faulted plant condition. 8, ASME Code Class 2 and 3 piping: