Document: NUREG-0800
Document ID: 89a50aec-b387-4999-9c8e-3b8e4f289a55
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070800027.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3
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Content:
itect-engineers from J. F. O'Leary, Director of Licensing, dated July 12, 1973. This document is attached as Appendix C to this Branch Technical Position (BTP). 1Underlined terms are defined in Branch Technical Position 3-4 BTP 3-3-2 Revision 3 - March 2007 Reviews of nuclear power plant designs have indicated that the functional or structural integrity of systems and components required for safe shutdown of the reactor and maintenance of cold shutdown conditions could be endangered by fluid system piping failures at locations outside containment. The staff has evolved an acceptable approach for the design, including the arrangement, of fluid systems located outside of containment to ensure that the plant can be safely shut down in the event of piping failures outside containment. This approach is set forth in this position and in the companion Branch Technical Position (BTP) 3-4. General Design Criterion (GDC) 2, “Design Bases for Protections Against Natural Phenomena,” requires that SSCs important to safety be designed to withstand the effects of natural phenomena such as earthquakes. The BTP 3-4 does not consider full-circumferential breaks in moderate-energy piping, only through-the-wall cracks. Full circumferential breaks in non- seismic piping should be considered in addition to all breaks postulated in BTP 3-4. It is the intent of this design approach that postulated piping failures in fluid systems should not cause a loss of function of essential safety-related systems and that nuclear plants should be able to withstand postulated failures of any fluid system piping outside containment, taking into account the direct results of such failure and the further failure of any single active component, with acceptable offsite consequences. The detailed provisions of the position below and of BTP 3-4 are intended to implement this intent with due consideration of the special nature of certain dual purpose systems and the need to define and to limit to a finite