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:
will neither impair the operability of the valve nor the integrity of the piping or the containment penetration. (A terminal end of such piping is considered to originate at this restraint location.) B. Moderate-Energy Fluid Systems 1. For piping systems that by plant arrangement and layout are isolated and physically separated and remotely located from systems and components important to safety, through-wall leakage cracks need not be postulated. 2. For piping systems that are located in the same areas as high-energy fluid systems which, by the criteria of A.1 to A.3 have postulated pipe break locations, through-wall leakage cracks need not be postulated. 3. For piping systems that are located in areas containing systems and components important to safety, but where no high-energy fluid systems are present, through-wall leakage cracks should be postulated at the most adverse location to determine the protection needed to withstand the effects of the resulting water spray and flooding. C. Size and Types of Pipe Breaks and Cracks 1. The following types of breaks should be postulated at the locations specified by the criteria listed under A. High-Energy Fluid Systems: a. longitudinal breaks in piping runs and branch runs with nominal pipe sizes of 4 inches and larger, b. circumferential breaks in piping runs and branch runs exceeding a nominal pipe size of 1 inch. 2. The following leakage cracks are postulated at the locations specified by the criteria listed under B. Moderate-Energy Fluid Systems: a. through-wall leakage cracks in piping and branch runs exceeding a nominal pipe size of 1 inch, where the crack opening is assumed as 1/2 the pipe diameter in length and 1/2 the pipe wall thickness in width. BTP 3-3-19 Revision 3 - March 2007 FOOTNOTES 1 High-energy systems include those systems where either of the following conditions are met: (a) the maximum operating temperature exceeds 200EF, and (b) the maximum operating pressure exceeds 275 psig. 2 Moderate energy