Document: NUREG-0800
Document ID: 6cd85972-0d5c-413b-9587-fbbfd5521c9f
Document Type: srp
Title: COMPRESSED AIR SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070525.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.1
CFR Part: 
CFR Title: 

Content:
10 C (18 F) 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 2 C (approximately 35 F). DRAFT Rev. 2 - April 1996 9.3.1-10 2.b. The maximum particle size in the air stream at the instrument shall be three (3) micrometers. 3.c. The maximum total oil or hydrocarbon content, exclusive of noncondensables, shall be as close to zero (0) w/w (weight ratio) or v/v (volume ratio) as possible; 82 and under no circumstances shall it exceed one (1) ppm w/w or v/v under normal operating conditions. 4.d. The instrument air shall be free of all corrosive contaminated and hazardous gases, flammable or toxic, which may be drawn into the instrument airstream. e. A regular periodic check should be made to assure high quality instrument air. 83 An acceptable SRCASICAS consists of non-oil lubricated (dry) compressors and 84 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 environmental phenomena, certain pipe breaks, or a loss of offsite power. The reviewer evaluates the system using engineering judgment and the results of failure modes and resulting effects analyses to determine that: a. T the failure of nonessentialnon-safety-related portions of the system or of other systems not designed to seismic Category I standards and located close to essentialsafety-related portions of the SRCASICAS, or of nonseismic Category I structures that house, support, or are close to the SRCASICAS, will not preclude operation of the essentialsafety-related portions of the SRCASICAS. Statements in the SAR to the effect that the above conditions are met are acceptable. b. The essential portions of the SRCAS are protected from the effects of floods, hurricanes, tornadoes, and internally or externally