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:
eds 1.2 S , and in Class 2 and 3 or m nonsafety class piping where the stress by them sum of Eq. (9) and (10) of Paragraph NC/ND 3652 exceeds 0.4 (1.2 S + S ). Nonsafety class piping which h A has not been evaluated to obtain similar stress information shall have cracks postulated at locations that result in the most severe environmental consequence.as follows: (1) For ASME Code, Section III, Class 1 piping, at axial locations where the calculated stress range by Eq. (10) in NB-3653 exceeds 1.2 S(m). 2 (2) For ASME Code, Section III, Class 2 and 3 or nonsafety-class (not ASME Class 1, 2, or 3) piping, at axial locations where the calculated stress by 2 the sum of Eqs. (9) and (10) in NC/ND-3653 exceeds 0.4 times the sum of the stress limits given in NC/ND-3653. (3) Nonsafety-class piping that has not been evaluated to obtain stress information should have leakage cracks postulated at axial locations that produce the most severe environmental effects.80 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 ASBSPLB 3-1, a review of the piping layout and 81 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 isolation valves provided they meet the requirements of the ASME Code, Section III, Subarticle NE-1120, and are designed such that the maximum stress 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