Document: NUREG-0800
Document ID: 89a50aec-b387-4999-9c8e-3b8e4f289a55
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800027.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
against postulated breaks of high and moderate energy piping outside of containment, particularly for those plants with construction permit applications currently under consideration. Sincerely, John F. O'Leary, Director Directorate of Licensing Enclosure: Appendix A BTP 3-3-17 Revision 3 - March 2007 APPENDIX A TO J. F. O'LEARY LETTER OF JULY 12, 1972 CRITERIA FOR DETERMINATION OF POSTULATED BREAK AND LEAKAGE LOCATIONS IN HIGH1 AND MODERATE2 ENERGY FLUID PIPING SYSTEMS OUTSIDE OF CONTAINMENT STRUCTURESc A. High-Energy Fluid Systems 1. For piping systems that by plant arrangement and layout are isolated by remote location for structures, systems, and components important to safety3, pipe breaks4 need not be postulated provided the requirements of A.4 are satisfied. 2. For piping systems that are enclosed in suitably designed concrete structures or compartments to protect structures, systems, and components important to safety, pipe break should be postulated at the following locations in each piping or branch run within the protective structure: a. the terminal ends9 of the piping or branch run (except as exempted by the provisions of A.4), if located within the protective structure or compartment, and b. each fitting (i.e., elbow, tee, cross, non-standard fitting), and c. a minimum of one break selected in each piping or branch run within the protective structure or compartment at a location that results in the maximum loading from the impact of the postulated ruptured pipe and jet discharge force on wall, floor, and roof of the structure or compartment, including internal pressurization, and taking into account any piping restraints provided to limit pipe motions. 3. For portions of piping systems that can neither be isolated as specified in A.1, nor enclosed in protective structures as specified in A.2, pipe breaks should be postulated at the following locations in each piping or branch run within the confines of the structures or compartments that enclose or