Document: NUREG-0800
Document ID: 50c5f9b6-d85c-4012-a8e9-48eaaafff93e
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550045.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
CFR Part: 
CFR Title: 

Content:
ce developed in the staff’s review. The primary reviewer coordinates this review with the other areas of review as stated in subsection I of this SRP section. The primary reviewer uses such input as required to complete this review procedure. With the various CRAVS designs proposed by applicants, there are variations in system requirements. For the purposes of this SRP section, a typical system with redundant subsystems is assumed with each subsystem having an identical essential (safety features) portion. 1. The SAR is reviewed to verify that the system description and piping and instrumentation diagrams (P&IDs) show the CRAVS equipment used for normal and emergency operations, and the ambient temperature limits for the areas serviced. The system performance requirements section is reviewed to determine that it describes allowable component operational degradation (e.g., loss of cooling function, damper leakage) and describes the procedures that will be followed to detect and correct these conditions. The reviewer, using results from failure modes and effects analyses as appropriate, determines that the safety-related portion of the system is capable of functioning in spite of the loss of any active component. For new applications, the system review should also verify conformance with ASME Code AG-1, “Code on Nuclear Air and Gas Treatment” including the AG-1a-92 Addenda. 2. The system P&IDs, layout drawings, and component descriptions and characteristics are then reviewed to determine that: A. Essential portions of the CRAVS are correctly identified and are isolable from nonessential portions of the system. The P&IDs are reviewed to verify that they clearly indicate the physical divisions between such portions and indicate design classification changes. System drawings are also reviewed to verify that they show the means for accomplishing isolation and the system description is reviewed to identify minimum performance requirements for the isolation dampers.