Document: NUREG-0800
Document ID: a4232dd4-7548-4c1c-9a51-16dc766f1087
Document Type: srp
Title: Revision 2 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
CFR Part: 
CFR Title: 

Content:
arated From Essential Systems and Components. For the purpose of satisfying the separation provisions of plant arrangement as specified in B.1.a of Branch Technical Position (BTP) 3-3, a review of the piping layout and plant arrangement drawings should clearly show that the effects of postulated piping breaks at any location are isolated or are physically remote from essential systems and components.1 At the designer's option, break locations as determined from 2A(iii) of this position may be assumed for this purpose. (ii) 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 design criteria of the ASME Code, Section III, Subarticle NE-1120, and the following additional design criteria: (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 Sm and should be calculated2 by Eq. (10) in ASME Code, Section III, NB-3653. BTP 3-4-3 Revision 2 - March 2007 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 ASME Code, Section III, 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 ASME Code, Section III, NB-3652 under the loadings resulting from a postulated piping failure beyond these portions of piping, should not exceed 2.25 Sm and 1.8 Sy, 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 ensured in accordance with the criteria specified in SRP Section