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:
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 loadings associated with the faulted plant condition. 3. Non-active ASME Code Class 1 valves that are designed by standard or alternative design rules: a. The primary-pressure rating Pr should not be exceeded by more than 10 percent 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. Pr should not be exceeded by more than 20 percent when the component is subjected to the loadings associated with the emergency plant condition. c. Pr 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. 4. Active ASME Code Class 1 pumps and valves4 that are designed by analysis: a. The design limits 6 specified in NB-3222 5 7,8 of the ASME Code should not be exceeded 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, or (3) 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. 5. Active ASME Code Class 1 valves that are designed by standard or alternative design rules: a. The primary-pressure rating Pr6 should not be' exceeded when 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)