Document: NUREG-0800
Document ID: c6f58bab-ddce-42eb-a3ef-02dd3da952fc
Document Type: srp
Title: Revision 3 – December 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16085A315.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
through-wall leakage cracks at any location in piping designed to seismic and nonseismic standards are isolated or physically remote from essential systems and components. (ii) Fluid System Piping in Containment Penetration Areas. Leakage cracks need not be postulated in those portions of piping from containment wall to and including the inboard or outboard isolation valves, provided (1) they meet the criteria of the ASME Code, Section III, NE-1120, and (2) the stresses calculated 9 by the sum of Eqs. (9) and (10) in ASME Code, Section III, NC-3653 do not exceed 0.4 times the sum of the stress limits given in NC-3653. (iii) Fluid Systems in Areas Other Than Containment Penetration. (1) Leakage cracks should be postulated in piping located adjacent to structures, systems, or components important to safety, except: 7 See Footnote 2. 8 See Footnote 2. 9 See Footnote 2. BTP 3-4-8 Revision 3 –December 2016 (a) Where excluded by 2.B(ii) or 2.B(iv), (b) For ASME Code, Section III, Class 1 piping, where the stress range calculated 10 by Eq. (10) in NB-3653 is less than 1.2Sm, and (c) For ASME Code, Section III, Class 2 or 3 and nonsafety-class piping, where the stresses calculated 11 by the sum of Eqs. (9) and (10) in 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 excluded by 2.B(iii)(1), 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 3-3. (iv) Moderate-Energy Fluid Systems in Proximity to High-Energy Fluid Systems. Leakage 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 environmental conditions than the high-energy