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:
in the system description section whether the SSAS is used as a backup instrumentation and control air source and connected to the ICAS. If the two systems are interconnected, then the area of review described below will extend from the ICAS to the outermost isolation valves on all interconnections between the two systems. The drawings and descriptions are reviewed to verify that two automatically operated isolation valves in series separate the SSAS from the ICAS and that these isolation valves are classified Quality Group C and seismic Category I. The quality of the air supplied from the SSAS will be reviewed in accordance with the air quality requirements of ANSI/ISA-S7.3-R1981. If the systems are not connected, then the review described below will be limited to the ICAS.70 9.3.1-9 DRAFT Rev. 2 - April 1996 2.1. The system description, system P&IDs, layout drawings, and component descriptions 71 and characteristics are reviewed to determine the following: a. EssentialSafety-related portions of the SRCASICAS are correctly identified and are isolable from the nonessentialnon-safety-related portions of the system. The P&IDs are reviewed to verify that they clearly indicate the physical division between each portion. System drawings are also reviewed to verify that they show the means for accomplishing isolation and the system description is reviewed to identify minimum performance requirements of the isolation valves. For the typical system, the drawings and descriptions are reviewed to verify that two automatically operated isolation valves in series separate the nonessential from the essential portions and components are provided to separate the non- safety-related portions from the safety-related portions of the system.72 b. EssentialSafety-related portions of the 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