Document: NUREG-0800
Document ID: 632e6c59-03bd-4648-b0b3-e8b2efd6fa04
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380197.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
tem does not connect with either the reactor coolant system or the containment atmosphere. B. The system is protected against missiles and pipe whip. C. The system is designated seismic Category I. D. The system is classified Quality Group B. E. The system is designed to withstand temperatures equal to at least that of the containment design. F. The system is designed to withstand the external pressure from the containment structure acceptance test. G. The system is designed to withstand the LOCA transient and environment. As to the structural design of containment internal structures and piping systems, the protection against loss of function from missiles, pipe whip, and earthquakes is acceptable if 1) isolation barriers are located behind missile barriers; 2) pipe whip was considered in the design of pipe restraints and the location of piping penetrating the containment; and 3) the isolation barriers, including the piping between isolation valves, are designated seismic Category I, i.e., designed to withstand the effects of the safe-shutdown earthquake, as recommended by Regulatory Guide 1.29. 16. To meet the requirements of GDCs 1, 2, 4, and 54, appropriate reliability and performance considerations should be included in the design of isolation barriers to reflect the safety importance of their integrity (i.e., containment capability) under accident conditions. The design criteria for components performing a containment isolation function, including the isolation barriers and the piping between them or the piping between the containment and the outermost isolation barrier, are acceptable if: A. Group B quality standards, as defined in RG 1.26, apply to the components, unless the service function dictates that Group A quality standards apply. B. The components are designated seismic Category I in accordance with RG 1.29. 17. GDC 54 requires reliable isolation capability; therefore, for remote-manual isolation valves, the design of the containment isolation system