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:
eneral Design Criteria 4, of Appendix A to 10 CFR Part 50 for the design of nuclear power plant structures and components. It is recognized that pipe rupture is a rare event which may only occur under unanticipated conditions, such as those which might be caused by possible design, construction, or opera- tion errors; unanticipated loads or unanticipated corrosive environments. Our observation of actual piping failures have indicated that they generally occur at high stress and fatigue locations, such as at the terminal ends of a piping system at its connection to the nozzles of a component. The rules of this position are intended to utilize the available piping design information by postulating pipe ruptures at locations having relatively higher potential for failure, such that an adequate and practical level of protection may be achieved. B. BRANCH TECHNICAL POSITION 1. High-Energy Fluid Systems Piping a. Fluid Systems Separated 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) ASB 3-1, a review of the piping layout and plant arrangement drawings should clearly show the effects of postulated piping breaks at any location are Isolated or physically remote from essential systems and components At the designer's option, break locations as determined Trom B.I.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 isola- tion 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)