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:
otion of the SSE, and the dynamic system loadings associated with the faulted plant condition. 0 1.48-6 DEFINITIONS Active Pumps and Valves. Components that must perform a mechanical motion during the course of accomplishing a system safety function. Allowable Stress Value (S). As specified in Appendix I of Section III of the ASME Boiler and Pressure Vessel Code. Design by analysis for Class 1 Pumps and Class 1 Valves. For Class 1 pumps, the design procedures specified in NB-3200 of the ASME Boiler and Pressure Vessel Code, Section III. For Class, I valves, the requirements of Case 1552 of Interpretations of ASME Boiler and Pressure Vessel Code. Dynamic System Loadings Associated with the Faulted Plant Condition. Refers to those dynamic loadings which result from the occurrence of a postulated rupture (e.g., complete severance or equivalent longitudinal break area) of any reactor coolant pressure boundary piping or of any other piping not a part of the reactor coolant pressure boundary. Emergency Plant Condition. Those operating conditions which have a low probability of occurrence. Faulted Plant Condition Those operating conditions associated with extremely-low-probability postulated events. Normal Plant Condition. Those operating conditions in the course of system startup, operation, hot standby, and shutdown other than upset, emergency, or faulted. plant conditions. Plant Conditions. Operating conditions of the plant categorized as normal, upset, emergency, and faulted. plant condtions. Primary-Pressure Rating (Pr). The primary-presstire rating corresponding to the maximum transient temperature for each plant condition, as specified in Section III of the ASME Boiler and Pressure Vessel Code, Tables NB-3531-1 to NB-3531-7, for Code Class 1 -valves or as specified in NC-3511 and ND-3511 for Code Class 2 and 3 valves, respectively. Safe Shutdown Earthquake (SSE). That earthquake which produces the vibratory ground motion for which structures, systems, and components