Document: NUREG-0800
Document ID: cf61f16a-4e82-42da-8333-e100f557fd60
Document Type: srp
Title: PLANT DESIGN FOR PROTECTION AGAINST POSTULATED PIPING FAILURES IN
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550032.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.1
CFR Part: 
CFR Title: 

Content:
eismic piping do not affect the ability of the plant to shut down safely and remain in safe shutdown condition. The application of GDC 2 to this SRP Section is to ensure that consideration is given to full-circumferential ruptures of non-seismic moderate energy piping. Such ruptures are not postulated for dynamic considerations under SRP Section 3.6.2 since that section only applies for normal plant conditions, not seismic events; however, environmental effects from these ruptures should be considered. In many cases, the limiting bound on environmental effects will be from failures of high-energy piping in the same area. However, the applicant should consider the effects on safety-related SSCs in areas where moderate energy failures may be the source of the most extreme postulated environmental effects. 3.6.1-6 Revision 3 - March 2007 2. Compliance with 10 CFR Part 50, Appendix A, GDC 4 requires that SSCs important to safety shall be designed to accommodate the effects of, and be compatible with, environmental conditions associated with normal operations, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. These SSCs should be appropriately protected against dynamic effects (including those of missiles, pipe whipping, and discharge fluids) that may result from equipment failures and from events outside the nuclear power unit. However, dynamic effects associated with postulated pipe ruptures in nuclear power units may be excluded from the design basis when analyses reviewed and approved by the Commission demonstrate that the probability of fluid system piping rupture is extremely low under conditions consistent with the design basis for piping. GDC 4 requirements are applicable to this SRP section because the reviewer verifies that a suitable and controlled operating environment will be provided for SSCs during normal operations, during anticipated operational occurrences, and during and after postulated accidents, including