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:
etermined from B.1.c of this position may be assumed for this purpose. b. Fluid System Piping in Containment Penetration Areas Breaks and cracks need not be postulated in those portions of piping from containment wall to and including the inboard or outboard isolation valves, provided they meet the requirements of the ASME Code, Section III, Subarticle NE-1120, and the following additional design requirements: (1) The following design stress and fatigue limits should not be exceeded: For ASME Code, Section III, Class 1 Piping (a) The maximum stress range between any two load sets (including the zero load set) should not exceed 2.4 S and should be m calculated by Eq. (10) in Paragraph NB-3653, ASME Code, 254 55 Section III, for those loads and conditions thereof for which level A and level B stress limits have been specified in the system's Design Specification, including an operating basis earthquake (OBE) event transient. The S is design stress intensity as defined m in Article NB-3600 of the ASME Code Section III. 56 If the calculated maximum stress range of Eq. (10) exceeds 2.4 S , m the stress ranges calculated by both Eq. (12) and Eq. (13) in Paragraph NB-3653 should meet the limit of 2.4 S . m (b) The cumulative usage factor should be less than 0.1. (c) The maximum stress, as calculated by Eq. (9) in Paragraph NB-3652 under the loadings resulting from a 57 postulated piping failure beyond these, portions of piping should not exceed 2.25 S and 1.8 S , except that following a failure m y 58 outside containment, the pipe between the outboard isolation valve and the first restraint may be permitted higher stresses provided a plastic hinge is not formed and operability of the valves with such stresses is assuredensured in accordance with the requirements specified in SRP Section 3.9.3. Primary loads include those which are deflection limited by whip restraints. 3.6.2-15 DRAFT Rev. 2 - April 1996 For ASME Code, Section III, Class 2 Piping (d) The maximum stress