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:
ing (ASME Code, Section III) should be postulated at the following locations in those portions of each piping and branch run: (a) At terminal ends. (b) At intermediate locations selected by one of the following criteria: (i) At each pipe fitting (e.g., elbow, tee, cross, flange, and nonstandard fitting), welded attachment, and valve. Where the piping contains no fittings, welded attachments, or valves, at one location at each extreme of the piping run adjacent to the protective structure. (ii) At each location where the stresses exceed 0.8 4 (1.2 S + S ) but at not less than two separated locations h A chosen on the basis of highest stress. Where the piping 6 consists of a straight run without fittings, welded attachment, or valves, and all stresses are below 0.8 Note that, in addition, breaks in nonseismic (i.e., non-Category I) piping are to be taken 4 into account as described in Section II.2.k, "Interaction of Other Piping with Category I Piping," of SRP Section 3.9.2. DRAFT Rev. 2 - April 1996 3.6.2-18 (1.2 S + S ), a minimum of one location chosen on the h A basis of highest stress.At each location where stresses calculated by the sum of Eqs. (9) and (10) in 2 NC/ND-3653, ASME Code, Section III, exceed 0.8 times the sum of the stress limits given in NC/ND-3653.75 As a result of piping reanalysis, due to differences between the design configuration and the as-built configuration, 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) exista redesign of the piping resulting in a change in pipe parameters (diameter, wall thickness, routing) is required, or the dynamic effects from the new (as-built) intermediate break locations are not mitigated by 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.