Document: NUREG-0800
Document ID: 92d817ac-3ce3-4cf7-8d1a-627e8242fbf2
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070312.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
ign measures are included that provide protection from the effects of the resulting water spray and flooding to the same extent required to satisfy criterion I(e)(c). The criteria for determination of postulated leakage locations are contained in Appendix A. The measures taken for the protection of structures, systems and components important to safety should not preclude the conduct of inservice examinations of ASME Class 2 and 3 pressure-retaining components as required by the rules of ASME Boiler and Pressure Vessel Code - Section XI, "Inservice Inspection of Nuclear Power Plant Components." Although compliance with the design criteria listed above should be accomplished by plant arrangement and layouts utilizing the separation concept to the extent practicable, special consideration will be necessary to provide adequate protection where interconnection is unavoidable between high-energy fluid containing piping and piping of systems important to safety. We are prepared to discuss with you these guidelines for the design of new nuclear power plants with regard to protection required against postulated breaks of high and moderate-energy piping outside of containment, particularly for those plants with construction permit applications currently under consideration. Sincerely, John F. O'Leary, Director Directorate of Licensing Enclosure: Appendix A DRAFT Rev. 3 - April 1996 3.6.1-28 APPENDIX A TO J. F. O'LEARY LETTER OF JULY 12, 1972 CRITERIA FOR DETERMINATION OF POSTULATED BREAK AND LEAKAGE LOCATIONS IN HIGH AND MODERATE ENERGY FLUID PIPING SYSTEMS a b OUTSIDE OF CONTAINMENT STRUCTURESc NOTE: Alphabetical superscripts designate footnotes at the end of Appendix A of J. F. O'Leary Letter dated July 12, 1972.53 A. High-Energy Fluid Systems 1. For piping systems that by plant arrangement and layout are isolated by remote location for structures, systems, and components important to safety, pipe breaks d e need not be postulated provided the requirements of A.4 are