Document: NUREG-0800
Document ID: e89cc26c-d19a-42b8-818a-fb598c05ccee
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN FLUID
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340548.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
YSTEMS OUTSIDE OF CONTAINMENT STRUCTURES 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 safetys, 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 com- ponents 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 adjoin areas containing systems and components important to safety: a. the terminal ends9 of piping or branch run (except as exempted by A.4), if located within the boundary of the confining structure or each compartment within the structure; and b. any intermediate location within the boundary of the confining structure or each compartment within the structure where the stresses5 under the loadings associated with specified seismic events6 and operational plant