Document: NUREG-0800
Document ID: e89cc26c-d19a-42b8-818a-fb598c05ccee
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN FLUID
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340548.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
develop a limited-size through-wall leakage crack instead of a pipe break. 3.6.1-23 Rev. 2 - October 1990 (b) For each postulated leakage, design 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 examina- tions 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 protec- tion where interconnection is unavoidable between high-energy fluid containing piping and piping of systems important to safety. We are prepared to discuss with you nuclear power plants with regard to breaks of high and moderate energy I for those plants with construction I consideration. these guidelines for the design of new protection required against postulated piping outside of containment, particularly permit applications currently under Sincerely, John F. O'Leary, Director Directorate of Licensing Enclosure: Appendix A *Refer to Appendix A for identification of moderate-energy fluid systems. 3.6.1-24 Rev. 2 - October 1990 APPENDIX A TO J. F. O'LEARY LETTER OF JULY 12, 1972 CRITERIA FOR DETERMINATION OF POSTULATED BREAK AND LEAKAGE LOCATIONS IN HIGH' and MODERATE2 ENERGY FLUID PIPING SYSTEMS OUTSIDE OF CONTAINMENT STRUCTURES 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