Document: NUREG-0800
Document ID: c23d52ec-d83f-4468-b35e-e8c97fdf2f09
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070461.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
is designated seismic Category I. 4. The system is classified Safety Class 2Quality Group B (Ref. 1210).56 5. The system is designed to withstand temperatures at least equal to the containment design temperature. 6. The system is designed to withstand the external pressure from the containment structure acceptance test. 7. The system is designed to withstand the loss-of-coolant accident LOCA transient and environment. Insofar as CSBSCSB is concerned with the structural design of containment internal 57 structures and piping systems, the protection of isolation barriers against loss of function from missiles, pipe whip, and earthquakes will be acceptable if isolation barriers are located behind missile barriers, pipe whip was considered in the design of pipe restraints and the location of piping penetrating the containment, and 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. p. In meeting the requirements of General Design Criteria 1, 2, 4, and 54, appropriate reliability and performance considerations should be included in the design of isolation barriers to reflect the importance to safety of assuring ensuring their integrity, 58 i.e., containment capability, under accident conditions. The design criteria applied to 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: 1. Group B quality standards as defined in Regulatory Guide 1.26 are applied to the components, unless the service function dictates that Group A quality standards be applied. 2. The components are designated seismic Category I, in accordance with Regulatory Guide 1.29. q. General Design CriterionGDC 54 requires reliable isolation capability. Therefore, when considering