w STANDARD REVIEW PLAN OFFICE OF NUCLEAR REACTOR REGULATION 6.2.4 CONTAINMENT ISOLATION SYSTEM REVIEW RESPONSIBILITIES Primary- Containment Systems Branch (CSB) Secondary- None

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 SRP section, therefore, is con-cerned with the isolation of fluid systems 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 CSB review of the applicant's safety analysis report (SAR) regarding contain-ment isolation provisions covers the following aspects: I 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. 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 selection of closure times of isolation valves. f. The mechanical redundancy of isolation devices