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:
the basis Of hiohest stress. As a result of piping reanalysis, the highest stress locations may be shifted; however, the initially determined intermediate break locations may be used unless one of the appropriate conditions of B.1.c(1)(d) exist. (3) Breaks in following nonnuclear class piping should be postulated at the locations in each piping or branch run: (a) At terminal ends of the run if located adjacent to the protective structure. (b) At each intermediate pipe fitting, welded attachment, and valve. (4) Applicable to (1), (2) and (3) above: If a structure separates a high energy line from an essential component, that separating structure should be designed to with- stand the consequences of the pipe break in the high-energy line which produces the greatest effect at the structure irrespective of the fact that the above criteria might not require sucn a break location to be postulated. $Select two locations with at least 10% difference in stress, or if stresses differ by less than 10%, two locations separated by a change of direction of the pipe run. 3.6.2-14 Rev. 1 - July 1981 - - - d. The designer should identify each piping run he has considered to postulate the break locations required by B.1.c above. In complex systems such as those containing arrangements of headers and parallel piping running between headers, the designer should identify and include all such piping within a designated run in order to postulate the number of breaks required by these criteria. e. With the exceptions of those portions of piping identified in B.1.b, leakage cracks should be postulated in ASME Code, Section III, Class 1 piping where the stress range by Eq. (10) of Paragraph NB-3653 exceeds 1.2 S , and in Class 2 and 3 or nonsafety class piping where the stress by thW sum of Eq. (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