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:
the original pipe-whip restraints and jet shields.76 (3) Breaks in seismically analyzed non-ASME Class piping are postulated according to the same requirements as for ASME Class 2 and 3 piping above. nonnuclear class piping should be postulated at the following 4 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.77 (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 withstand 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 such a break location to be postulated. (5) Safety-related equipment must be environmentally qualified in accordance with SRP Section 3.11. Required pipe ruptures and leakage cracks (whichever controls) must be included in the design bases for environmental qualification of electrical and mechanical equipment both inside and outside the containment.78 d. The designer should identify each piping run he has considered to postulate the 79 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 3.6.2-19 DRAFT Rev. 2 - April 1996 range by Eq. (10) of Paragraph NB-3653 exceeds 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