Document: NUREG-0800
Document ID: 645cc743-c9e4-428c-b05d-ead2517eb3fa
Document Type: srp
Title: DETERMINATION OF RUPTURE LOCATIONS AND DYNAMIC EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070315.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.2
CFR Part: 
CFR Title: 

Content:
s as necessary to satisfy B.3.d of BTP ASB 3-1. (1) Leakage cracks should be postulated in piping located adjacent to structures, systems, or components important to safety, except: (a) Where exempted by B.2.b or B.2.d, (b) For ASME Code, Section III, Class 1 piping, the stress range calculated by Eq. (10) in NB-3653 is less than 1.2 S(m), and 2 (c) For ASME Code, Section III, Class 2 or 3 and nonsafety-class piping, the stresses calculated by the sum of Eqs. (9) and (10) in 2 NC/HD-3653 are less than 0.4 times the sum of the stress limits given in NC/ND-3653. (2) Leakage cracks, unless the piping system is exempted by (1) above, should be postulated at axial and circumferential locations that result in the most severe environmental consequences. (3) Leakage cracks should be postulated in fluid system piping designed to nonseismic standards as necessary to satisfy B.3.d of BTP SPLB 3-1.83 d. Moderate-Energy Fluid Systems in Proximity to High-Energy Fluid Systems CracksLeakage cracks need not be postulated in moderate-energy fluid system piping located in an area in which a break in high-energy fluid system piping is postulated, provided such leakage cracks would not result in more limiting 84 environmental conditions than the high-energy piping break. Where a postulated leakage crack in the moderate-energy fluid system piping results in more limiting environmental conditions than the break in proximate high-energy fluid system piping, the provisions of B.2.c should be applied. e. Fluid Systems Qualifying as High-Energy or Moderate-Energy Systems Through-wall leakage cracks instead of breaks may be postulated in the piping of those fluid systems that qualify as high-energy fluid systems for only short operational periods but qualify as moderate-energy fluid systems for the 6 5 85 major operational period. 3.6.2-21 DRAFT Rev. 2 - April 1996 3. Type of Breaks and Leakage Cracks in Fluid System Piping a. Circumferential Pipe Breaks The following circumferential breaks