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:
ards areas. The CSBSCSB102 bases its acceptance of the leakage detection provisions described in the SAR on the capability to detect leakage and identify the lines that should be isolated. The CSBSCSB determines that the containment isolation provisions are designed to allow the 103 isolation barriers to be individually leak-tested. This information should be tabulated in the safety analysis reportSAR to facilitate the CSBSCSB review. 104 105 The CSBSCSB determines from the descriptive information in the SAR that provisions have 106 been made in the design of the containment isolation system to allow periodic operability testing of the power-operated isolation valves and the containment isolation system. At the operating license stage of review, the CSBSCSB determines that the content and intent of proposed 107 technical specifications pertaining to operability and leak-testing of containment isolation equipment is in agreement with requirements developed by the staff. In particular, technical specifications should exist for the following: containment purge or vent valves that do not satisfy the operability criteria set forth in BTP CSB 6-4 must be sealed closed as defined in Item II.f above and verified sealed closed at least every 31 days during all operational conditions, except cold shutdown and refueling; purging or venting time should be minimized consistent with ALARA principles for occupational exposure; and containment purge or vent valves with resilient seals must be subjected to leakage-testing and periodic resilient seal replacement.108 The CSBSCSB verifies that the design of the control system for automatic containment 109 isolation valves is such that resetting the isolation signal will not result in the automatic reopening of containment isolation valves, and that ganged reopening of isolation valves is not possible. The SCSB evaluates the design features of the purging/venting system that are provided to minimize purging time and verifies that there