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:
ed. 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 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, temperature, pressure, and radiation level. r. General Design CriterionGDC 54 specifies the requirements for the containment isolation system. Therefore, to satisfy General Design Criterion GDC 54, provisions should be made in the design of the containment isolation system for operability testing of the DRAFT Rev. 3 - April 1996 6.2.4-10 containment isolation valves and leakage rate testing of the isolation barriers. The isolation valve testing program 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 CriterionGDC 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-071810 CFR 50.34(f)(2)(xiv) requires that the design of the control systems 59 for automatic containment isolation valves be such that resetting the isolation 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 valves is not acceptable. Reopening of isolation valves must be performed on a