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:
or 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 valves separating safety-related from nonsafety-related portions, are classified Quality Group C and seismic Category I. SAR component and system descriptions of mechanical and performance characteristics are reviewed for whether the classifications are included and whether the P&IDs indicate points of change in any design classification. The review for seismic design and the reviews for seismic and quality classification are as indicated in subsection I of this SRP section. C. In addition to the SSAS, other connected systems including air or nitrogen accumulators and nitrogen systems designed to provide backup nitrogen or compressed air to the ICAS are identified. D. If an air or nitrogen accumulator is a compressed air supply or backup air source, the effects on the system and components (e.g., safety-relief valves, solenoid actuators, etc.) of potential over-pressurization are reviewed. 2. The ICAS is reviewed for whether the system meets ANSI/ISA-S7.3-R1981, including connected or backup systems like air or nitrogen accumulators, nitrogen systems, or other air systems designed to backup the ICAS. 9.3.1-8 Revision 2 - March 2007 A. The dew point at line pressure for outdoor installations (where any part of the instrument air system is exposed to the outdoor atmosphere) must be at least 10 EC (18 EF) below the minimum recorded ambient temperature at the plant site. The dew point at line pressure for indoor installations (where the entire instrument air system is installed indoors) must be at least 10 EC (18 EF) below the minimum temperature to which any part of the instrument air system is exposed at any season of the year. The dew point at line pressure for indoor installation should never exceed 2 EC (approximately 35 EF). B. The maximum particle size in the air