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:
D). Additional guidance for review of this setpoint is presented in Item II.E.4.2 of NUREG-0737. 4. The reviewer verifies that the control system for automatic containment isolation valves is designed for resetting of the isolation signal without automatic reopening of containment isolation valves and that combined reopening of isolation valves is not possible. 5. Systems having post-accident safety functions (essential systems) may have remote-manual isolation valves in the lines penetrating the containment. Provisions for detecting leakage from these lines outside containment and for allowing the operator in the main control room to isolate the system train if leakage occurs are reviewed. Leakage detection provisions may include instrumentation for measuring system flow rates or the pressure, temperature, radiation, or water level in areas outside the containment like valve rooms or engineered safeguards areas. Acceptance of the leakage detection provisions described in the SAR is based on capability to detect leakage and identify lines that should be isolated. The reviewer determines whether the containment isolation provisions are designed for individual leak-testing of isolation barriers. This information should be tabulated in the SAR to facilitate review. 6. The reviewer determines from the SAR descriptive information whether provisions in the design of the containment isolation system allow periodic operability testing of the power-operated isolation valves and the containment isolation system. At the operating license stage of review, the reviewer determines whether the content and intent of proposed technical specifications for operability and leak-testing of containment isolation equipment agree with requirements developed by the staff. In particular, there should be the following technical specifications: containment purge or vent valves that do not 6.2.4-15 Revision 3 - March 2007 satisfy BTP 6-4 operability criteria must be sealed closed as defined in