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:
strument 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 stream at the instrument must be three (3) micrometers. C. The maximum total oil or hydrocarbon content, exclusive of non-condensables, must be as close to zero (0) weight ratio (w/w) or volume ratio (v/v) as possible and never exceed one (1) ppm w/w or v/v under normal operating conditions. D. The instrument air must be free of all corrosive, contaminated, or hazardous gases, flammable or toxic, drawn into the instrument airstream. E. A regular periodic check should assure high-quality instrument air. An acceptable ICAS consists of non-oil-lubricated (dry) compressors and automatic molecular sieve air dryers with input and output filters. 3. The reviewer evaluates the system failure modes and effects for whether the failure of nonsafety-related portions of the system or of other systems not designed to seismic Category I standards and located close to safety-related portions of the ICAS or of nonseismic Category I structures that house, support, or bound the ICAS preclude operation of safety-related ICAS portions. SAR statements to the effect that these conditions are met are acceptable. 4. The reviewer evaluates the ICAS for whether an adequate ICAS air supply source is available to cope with the following events: A. Loss of Offsite Power. If the minimum performance requirements stated in the SAR are met, the system design is acceptable assuming a concurrent failure of a single, active component, including an emergency power source. SAR statements and failure mode and effects analysis results are considered for whether the system meets these requirements and are acceptable verification of system functional reliability. In addition, the reviewer determines whether the equipment affected by the loss of offsite power and subsequent loss of air supply fails in a safe