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:
should be assumed to occur in the plane defined by the piping geometry and configuration, and to initiate pipe movement in the direction of the jet reaction. b. Longitudinal Pipe Breaks The following longitudinal breaks should be postulated in high-energy fluid system piping at the locations of the circumferential breaks specified in B.3.a: (1) Longitudinal breaks in fluid system piping and branch runs should be postulated in nominal pipe sizes 4-Inch and larger, except where the maximum stress range3'4 exceeds the limits specified in B.1.c(l) and B.1.c(2) but the axial stress range is at least 1.5 times the circumferential stress range. (2) Longitudinal breaks need not be postulated at: (a) Terminal ends. (b) At intermediate locations where the criterion for a minimum number of break locations must be satisfied. (3) Longitudinal breaks should be assumed to result in an axial split without pipe severance. Splits should be oriented (but not concurrently) at two diametrically opposed points on the piping circumference such that the jet reactions causes out-of- plane bending of the piping configuration. Alternatively, a single split may be assumed at the section of highest tensile stress as determined by detailed stress analysis (e.g., finite element analysis). (4) The dynamic force of the fluid jet discharge should be based on a circular or elliptical (20 x 1/2D) break area equal to the effective cross-sectional flow area of the pipe at the break location and on a calculated fluid pressure modified by an analytically or experimentally determined thrust coefficient as determined for a circumferential break at the same location. Line restrictions, flow limiters, positive pump-controlled flow, and the absence of energy reservoirs may be taken into account, as applicable, In the reduction of jet discharge. 3.6.2-17 Rev. 1 - July 1981 (5) Piping movement should be assumed to occur in the direction of the jet reaction unless limited by structural members, piping