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:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of containment integrity Secondary - None I. AREAS OF REVIEW The containment isolation system allows the normal or emergency passage of fluids through the containment boundary while preserving the ability of the boundary to prevent or limit the escape of fission products from postulated accidents. This Standard Review Plan (SRP) section, therefore, addresses the isolation of fluid systems penetrating the containment boundary, including design and testing requirements for isolation barriers and actuators. Isolation barriers include valves, closed piping systems, and blind flanges. The specific areas of review are as follows: 1. The design of containment isolation provisions, including: A. The number and location of isolation valves (i.e., the isolation valve arrangements and their physical locations as to the containment). B. The actuation and control features for isolation valves. C. The positions of isolation valves for normal plant operating conditions (including shutdown), post-accident conditions, and valve operator power failures. 6.2.4-2 Revision 3 - March 2007 D. The valve actuation signals. E. The basis for selection of closure times of isolation valves. F. The mechanical redundancy of isolation devices. G. The acceptability of closed piping systems inside containment as isolation barriers. 2. The protection of containment isolation provisions against loss of function from missiles, pipe whip, and earthquakes. 3. The environmental conditions inside and outside the containment considered in the design of isolation barriers. 4. The design criteria applied to isolation barriers and piping. 5. The provisions for detecting needs to isolate remote manual-controlled systems like engineered safety feature systems. 6. The design provisions and technical specifications for testing of isolation barrier operability and leakage rate. 7. The calculation of containment atmosphere released prior to