Document: NUREG-0800
Document ID: 949ca18d-b0e4-4b54-9ca9-fdb657988111
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660170.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
eeded for severe accidents must be designed so there is reasonable assurance they will operate in the severe accident environment for which they are intended, and over the time span for which they are needed. They need not be subject to additional environmental or seismic qualification testing or analysis. Appendix 7.1-A-12 Revision 5 - March 2007 The review of conformance with GDC 2 should be coordinated with the organization responsible for review of plant systems and the organization responsible for review of mechanical engineering topics. (c) GDC 4, "Environmental and Dynamic Effects Design Bases" "Structures, systems, and components important to safety shall be designed to accommodate the effects of and to be compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. These structures, systems, and components shall be appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids that may result from equipment failures and from events and conditions outside the nuclear power unit..." Applicability - All I&C safety systems and supporting data communication systems. Review Methods - The environmental and missile design bases for I&C systems important to safety should be provided for each system in Chapter 7 of the SAR. The design bases should identify those systems and components that are qualified to accommodate the effects of environmental conditions and that are protected from the dynamic effects of missiles, pipe whipping, and discharging fluids. If systems or components are qualified to survive the environmental effects of postulated accidents for limited periods of time, the bases for limited operability should be provided. Review of equipment qualification for environmental conditions should be conducted in accordance with the guidance provided in SRP Appendix 7.1-B Subsection 4.4 and SRP