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 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 (d) support boundary conditions. If a crushable material, such as honeycomb, is used, the allowable capacity of crushable material shall be limited to 80% of its rated energy dissipating capacity as determined by dynamic testing, at loading 3.6.2-4 Rev. 1 - July 1981 rates within + 50% of the specified design loading rate. The rated energy dissipating capacity shall be taken as not greater than the area under the load-deflection curve as illustrated in Figure 3.6.2-1. The portion of the curve in which the value of load vs. deflection has departed from the essentially horizontal portion shall not be used. Pure tension members shall be limited to an allowable strain of 50% of the ultimate uniform strain (Xm) (see Figure 3.6.2-2 (a)). Alternatively the allowable strain value may be determined as the value of strain associated with 50% of the ultimate uniform energy absorption capacity as determined by dynamic testing at loading rates within ± 50% of the specified design loading rate (see Figure 3.6.2-2 (b)). The method of dynamic analysis used should be capable of deter- mining the inelastic behavior of the piping and restraint system within these design limits. 0 Do not use this Deflection Figure 3.6.2-1 ta 5- Rated energy dissipating capacity . I C valu I -- IA II in 1 Do not Displac use this value I :ement (a) (b) Figure 3.6.2-2 Limitations on pure tension members I 3.6.2-5 Rev. 1 - July 1981 A 10% increase of minimum specified design yield strength (S ) may be used in the analysis to account for strain rate effects. Y Dynamic analysis methods and procedures presented should include: (1) A representative mathematical model. of the piping system or piping and restraint system. (2) The analytical method of solution selected. (3) Solutions for the most severe responses