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:
erms of the kinetic energy or momentum induced by the impact of the whipping pipe, if unre- strained, upon a protective barrier or a component important to safety and to determine the dynamic response of the restraints induced by the impact and rebound, if any, of the ruptured pipe. An unrestrained whipping pipe should be considered capable of causing circumferential and ongitudinal breaks, individually, in impacted pipes of smaller nominal pipe size, and developing through-wall cracks in equal or larger nominal pipe sizes with thinner wall thickness, except where analytical or experimental, or both, data for the expected range of impact energies demonstrates the capability to withstand the impact without rupture. At the CP stage, the staff reviews the applicant's criteria, methods, and procedures used or proposed for dynamic analyses by comparing them to the criteria which follow. At the OL stage, the analyses are reviewed in accordance with these criteria. a. Dynamic Analysis Criteria An analysis of the dynamic response of the pipe run or branch should be performed for each longitudinal and circumferential postulated piping break. The loading condition of a pipe run or branch, prior to the postulated rupture, in terms of internal pressure, temperature, and inertial effects should be used in the evaluation for postulated breaks. For piping pressurized during operation at power, the initial condition should be the greater of the contained energy at hot standby or at 102% power. In the case of a circumferential rupture the need for a pipe whip dynamic analysis may be governed by considerations of the available driving energy. Dynamic analysis methods used for calculating piping and restraint system responses to the jet thrust developed following the postulated rupture should adequately acccunt for the following effects: (a) mass inertia and stiffness properties of the system (b) impact and rebound, (c) elastic and inelastic deformation of piping and restraints, and