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:
) 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 Sm, and should be calculated by Eq. (10) in Paragraph NB-3653, ASME Code, Section III, for those loads -and conditions thereof for 1Systems and components required to shut down the reactor and mitigate the consequences of a postulated pipe rupture without offsite power. 3.6.2-10 Rev. 1 - July 1981 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 in Article NB-3600 of the ASME Code Section III. If the calculated maximum stress range of Eq. (10) exceeds 2.4 Sm. the stress ranges calculated by both Eq. (12) and Eq. (13) in Paragraph NB-3653 should meet the limit of 2.4 Sm (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 postulated piping failure beyond these portions of piping should not exceed 2.25S except that following a failure 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 assured in accordance with the requirements specified in SRP Section 3.9.3. Primary loads include those which are deflection limited by whip restraints. For ASME Code, Section III, Class 2 Piping (d) The maximum stress ranges as calculated by the sum of Eq. (9) and (10) in Paragraph NC-3652 ASME Code, Section III, con- sidering those loads and conditions thereof for which level A and level B stress limits have been specified in the system's Design Specification (i.e., sustained loads, occasional loads, and thermal expansion) including an OBE