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:
FLUID SYSTEMS OUTSIDE CONTAINMENT REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of plant design for protection of structures, systems, and components from internal and external hazards Secondary - None I. AREAS OF REVIEW The plant design for protection against piping failures outside containment is reviewed to ensure that environmental effects of such failures would not cause the loss of needed functions of safety-related systems and to ensure that the plant could be safely shut down in the event of such failures. The review includes high energy and moderate energy fluid system piping located outside of containment. If such a system penetrates containment (except for the auxiliary feedwater system) the review starts with the first isolation valve outside of containment. The review boundary for auxiliary feedwater systems extends either to the steam generator or to the feedwater (or steam) line, as appropriate. This section includes a reviews of the plant design to ensure conformance with the requirements of 10 CFR Part 50, Appendix A, General Design Criteria (GDC) 2, and GDC 4. The specific areas of review are as follows: 3.6.1-2 Revision 3 - March 2007 1. Reviews of the general layout of high and moderate energy piping systems with respect to the plant arrangement criteria of Section B.1. of Branch Technical Position (BTP) 3-3. Three arrangement situations are covered by the criteria and all three may be encountered in a single plant. They are: A. Arrangements where protection of safety-related plant features is provided by separation of high and moderate energy systems from essential systems and components. B. Arrangements where protection of safety-related plant features is provided by enclosing either the high and moderate energy systems or the safety-related features in protective structures. C. Arrangements where neither separation nor protective enclosures are practical and special protective measures are taken to ensure the