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:
REVIEW RESPONSIBILITIES Primary - Containment Systems Branch (CSB)and Severe Accident Branch (SCSB)1 Secondary - None I. AREAS OF REVIEW The design objective of the containment isolation system is to allow 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 that may result from postulated accidents. This Standard Review Plan (SRP) section, therefore, is concerned with the isolation of fluid systems 2 which penetrate the containment boundary, including the design and testing requirements for isolation barriers and actuators. Isolation barriers include valves, closed piping systems, and blind flanges. The CSBSCSB review of the applicant's safety analysis report (SAR) regarding containment 3 isolation provisions covers the following aspects: 1. The design of containment isolation provisions, including: a. The number and location of isolation valves, i.e., the isolation valve arrangements and the physical location of isolation valves with respect to the containment. b. The actuation and control features for isolation valves. DRAFT Rev. 3 - April 1996 6.2.4-2 c. The positions of isolation valves for normal plant operating conditions (including shutdown), postaccident conditions, and in the event of valve operator power failures. d. The valve actuation signals. e. The basis for . The mechanical redundancy of isolation devices. g. The acceptability of closed piping systems inside containment as isolation barriers. 2. The protection provided for containment isolation provisions against loss of function of missiles, pipe whip, and earthquakes. 3. The environmental conditions inside and outside the containment that were considered in the design of isolation barriers. 4. The design criteria applied to isolation barriers and piping. 5. The provisions for detecting a possible need to isolate remote-manual- controlled systems, such as engineered safety features