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:
SRCASICAS, including the isolation valves separating essentialsafety-related portions from nonessentialnon-safety- related portions, are classified Quality Group C and seismic Category I. 73 Component and system descriptions in the SAR that identify mechanical and performance characteristics are reviewed by the ASBSPLB to verify that the 74 above classifications have been included 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 reviews for seismic and quality classification, isare performed by the MEB as indicated in subsection I of this SRP section.75 c. In addition to the SSAS described above, other interconnected systems including air or nitrogen accumulators and nitrogen system that are designed to provide backup nitrogen or compressed air to the ICAS are identified.76 d. If an air or nitrogen accumulator is provided as a compressed air supply or backup air source, a review of the effects on the system and components (e.g., safety-relief valves, solenoid actuators, etc.) due to potential overpressurization will be performed.77 2. The SRCASICAS is reviewed to verify the system meets ANSI MC 11.1-1976, 78 79 (ISA-S7.3)ANSI/ISA-S7.3-R1981 , including interconnected or backup systems such as 80 air or nitrogen accumulators, nitrogen systems, or other air systems that are designed to backup the ICAS : 81 1.a. 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 10 C (18 F) 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 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