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:
range does not exceed 0.4 (1.2 S + S ) for ASME Code, Section III, Class 2 piping.need not h A be postulated in those portions of piping from containment wall to and including the inboard or outboard isolation valves provided they meet the requirements of the ASME Code, Section III, NE-1120, and the stresses calculated by the sum of 2 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-3653.82 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 S , and Class 2 or 3 or non-safety class piping m is less than 0.4 (1.2 S + S ). The cracks should be postulated to occur h A individually at locations that result in the maximum effects from fluid spraying and flooding, with the consequent hazards or environmental conditions developed. An The operational period is considered "short" if the fraction of time that the system 6 5 operates within the pressure-temperature conditions specified for high-energy fluid systems is about 2% percent of the time that the system operates as a moderate-energy fluid system (e.g., systems such as the reactor decay heat removal system qualify as moderate-energy fluid systems; however, systems such as auxiliary feedwater systems operated during PWR reactor startup, hot standby, or shutdown qualify as high-energy fluid systems). DRAFT Rev. 2 - April 1996 3.6.2-20 (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. (1) Leakage cracks should be postulated in piping located adjacent to structures, systems, or components important to safety, except: (a) Where exempted