Document: NUREG-0800
Document ID: b3748a15-3b80-4626-a0a5-eb9f270739ad
Document Type: srp
Title: DETERMINATION OF RUPTURE LOCATIONS AND DYNAMIC EFFECTS ASSOCIATED
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340555.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.2
CFR Part: 
CFR Title: 

Content:
q. (9) and (10) of Paragraph NC/ND 3652 exceeds 0.4 (1.2 S + S ) Nonsafety class piping which has not been evaluated to obtpin'ssmilar stress information shall have cracks postulated at locations that result in the most severe environmental consequence. 2. Moderate-Energy Fluid System Piping a. Fluid Systems Separated from Essential Systems and Components For the purpose of satisfying the separation provisions of plant arrangement as specified in B.1.a of BTP ASB 3-1, a review of the piping layout and plant arrangement drawings should clearly show that the effects of 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. b. 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 isola- tion valves provided they meet the requirements of the ASME Code, Section III, Subarticle NE-1120, and are designed such that the maxi- mum stress range does not exceed 0.4 (1.2 Sh + SA) for ASME Code, Section III, Class 2 piping. c. Fluid Systems In Areas Other Than Containment Penetration (1) Through-wall leakage cracks should be postulated in fluid system piping located adjacent to structures, systems or components Important to safety, except (1) where exempted by B.2.b and B.2.d, or (2) where the maximum stress range in these portions of Class 1 piping (ASME Code, Section III) is less than 1.2 Sm. and Class 2 or 3 or non-safety class piping is less than 0.4 (1.2 Sh + SA)- The cracks should be postulated to occur individually at locations that result in the maximum effects from fluid spraying and flooding, with the consequent hazards or environmental conditions developed. (2) Through-wall leakage cracks should be postulated in fluid system piping designed to nonseismic standards as necessary to satisfy B.3.d of BTP ASB 3-1. 3.6.2-15 Rev. 1 -