Document: NUREG-0800
Document ID: 76205ba0-6d0f-463f-b38b-37cc41a9b7ec
Document Type: srp
Title: COMPRESSED AIR SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.1
CFR Part: 
CFR Title: 

Content:
of the applicant’s technical specifications agree with the requirements for system testing, minimum performance, and surveillance developed from the staff’s review. Because of various CAS designs for different plants, there are variations in system requirements. For purposes of this SRP section, a typical CAS is assumed to have two independent systems, an SSAS and an ICAS. The SAR is reviewed to determine from information in the system description section whether the SSAS is connected to the ICAS as a backup instrumentation and control air source. If the two systems are connected, then the area of review extends from the ICAS to the outermost isolation valves on all connections between the two systems. The drawings and descriptions are reviewed for whether two automatically-operated isolation valves in series separate the SSAS from the ICAS and whether these isolation valves are classified Quality Group C and seismic Category I. The quality of the air supplied from the SSAS is reviewed for accordance with ANSI/ISA-S7.3-R1981 air quality requirements. If the systems are not connected, then the review is limited to the ICAS. 1. The system description, system piping and instrument diagrams (P&IDs), layout drawings, and component descriptions and characteristics are reviewed for the following: A. Safety-related ICAS portions are identified correctly and can be isolated from the nonsafety-related portions. The P&IDs are reviewed for whether they clearly indicate the physical division between each portion. System drawings are also reviewed for whether they show the means for accomplishing isolation and the system description is reviewed for minimum performance requirements of the isolation valves. For the typical system, the drawings and descriptions are reviewed for whether two automatically-operated isolation valves in series separate the nonsafety-related from the safety-related portions of the system. B. Safety-related ICAS portions, including the isolation