Document: NUREG-0800
Document ID: 6c5a07e2-91cf-49ae-a450-62551ed6bcef
Document Type: srp
Title: CONTAINMENT ISOLATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340703.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.2.4
CFR Part: 
CFR Title: 

Content:
cate with either the reactor coolant sys- tem or the containment atmosphere. 2. The system is protected against missiles and pipe whip. 3. The system is designated seismic Category I. 4. The system is classified Safety Class 2 (Ref. 12). 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 tran- sient and environment. Insofar as CSB is concerned with the structural design of containment inter- nal 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 missiles barriers, pipe whip was considered in the design of pipe restraints and the loca- tion of piping penetrating the containment, and the isolation barriers, including the piping between isolation valves, are designated seismic Cate- gory 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 their integrity; i.e., containment capability, under accident conditions. The design criteria applied to components performing a contain- ment 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