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:
latory 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. 6.2.4-7 Rev. 2 - July 1981 q. General Design Criterion 54 requires reliable isolation capability. There- fore, when considering remote manual isolation valves, the design of the containment isolation system is acceptable if provisions are made to allow the operator in the main control room to know when to isolate fluid systems that are equipped with remote manual isolation valves. Such provisions may include instruments to measure flow rate, sump water level, tempera- ture, pressure, and radiation level. r. General Design Criterion 54 specifies the requirements for the containment r isolation system. Therefore, to satisfy General Design Criterion 54, pro- visions should be made in the design of the containment isolation system for operability testing of the containment isolation valves and leakage rate testing of the isolation barriers. The isolation valve testing pro- gram should be consistent with that proposed for other engineered safety features. The acceptance criteria for the leakage rate testing program for containment isolation barriers are presented in SRP Section 6.2.6. s. General Design Criterion 54 requires reliable isolation capability. To satisfy this requirement, provisions should be made in the design of the containment isolation system to reduce the possibility of isolation valves reopening inadvertently following isolation. In this regard, Item II.E.4.2 of NUREG-0737 and NUREG-0718 requires that the design of the control systems for automatic containment isolation valves be such that resetting the isola- tion signal will not result in the automatic reopening of containment isolation valves. Reopening of containment isolation valves should require deliberate operator action. In addition, ganged reopening of containment isolation