Document: NUREG-0800
Document ID: f430fab5-dea3-4bc8-99ea-3bdf995735cd
Document Type: srp
Title: COMPRESSED AIR SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350551.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.1
CFR Part: 
CFR Title: 

Content:
rformance characteristics are reviewed by the ASB to verify that the above classifications have been included1 and that the P&IDs indicate points of change in any design classification. The review for seismic design is performed by the SEB and the review for seismic and quality classification is performed by the MEB as indicated in subsection I of this SRP section. The SRCAS is reviewed to verify the system meets ANSI MC 11.1-1976, (ISA-S7.3): 1. The dew point at line pressure for outdoor installations (where any part of the instrument air system is exposed to the outdoor atmosphere) shall be at least 101C (181F) below the minimum local 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) shall be at least 100C (180F) below the minimum temperature to which any part of the instrument air system is exposed at any season of the year. In no case should the dew point at line pressure for indoor installation exceed 20C (approximately 350F). 9.3.1-4 Rev. 1 - July 1981 2. The maximum particle size in the air stream at the instrument shall *be three (3) micrometers. 3. The maximum total oil or hydrocarbon content, exclusive of noncon- densables, shall be as close to zero (0) w/w or v/v as possible; and under no circumstances shall it exceed one (1) ppm w/w or v/v under normal operating conditions. 4. The instrument air shall be free of all corrosive contaminants and hazardous gases, flammable or toxic, which may be drawn into the instrument airstream. A regular periodic check should be made to assure high quality instrument air. An acceptable SRCAS consists of non-oil lubricated (dry) compressors and automatic molecular sieve air dryers with input and output filters. 3. The reviewer verifies that the system has been designed so that system function will be maintained, as required, in the event of adverse environ- mental phenomena, certain pipe breaks, or a loss of