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:
u of analysis since detailed analytical techniques are. not applied to design pressure-temperature rated valves. C. REGULATORY POSITION Seismic Category I fluid system components should be designed to withstand the following loading combinations within the design limits ' specified. 1. ASME Code2 .Class 1 vessels and piping: a. The design limits specified in NB-3223 and NB-3654 of the ASME Code for vessels and piping, respectively, should not be exceeded when the component is subjected to concurrent loadings associated with either the normal plant condition or the upset plant condition 3 and the vibratory motion of 50 percent of the Safe Shutdown Earthquake (SSE). b. The design limits specified in NB-3224 and NB-3655 of the ASME Code for vessels and piping, respectively, 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 and NB-3656 of the ASME Code for vessels and piping, respectively, 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. 2. Non-active ASME Code Class 1 pumps and valves 4 that are designed by analysis: a. The design limits specified in NB-3223s 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. 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 tile 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