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:
nt and control air system is not supplied by other compressed air supplies with less restrictive air quality requirements. ANSI/ISA-S7.3-R1981 provides air quality criteria. This criteria, if followed for the ICAS and backup compressed air sources, help ensure that ICAS and the equipment supplied from the ICAS will reliably perform their intended safety functions. 2. GDC 2 requires that safety-related SSCs be designed to withstand the effects of natural phenomena, including earthquakes, without loss of capability to perform safety functions. The ICAS provides compressed air or nitrogen required to actuate or control equipment that performs safety-related functions during normal operations, transients, or accidents. A seismic design classification system based on SAR reviews identifies plant features that should be designed to withstand SSE effects. RG 1.29 describes an acceptable method for identifying and classifying features of light-water reactor nuclear 9.3.1-6 Revision 2 - March 2007 power plants that should be designed to withstand SSE effects. SSCs that should be designed to remain functional if the SSE occurs are designated as seismic Category 1. RG 1.29, Position C.1, states that systems required for safe shutdown, including their foundations and supports, are designated as seismic Category I and should be designed to withstand SSE effects and remain functional. RG 1.29, Position C.2, states that SSCs, the continued function of which is not required but the failure of which could reduce the functioning of any seismic Category I plant feature to an unacceptable safety level or could result in incapacitating injury to control room occupants, should be designed and constructed so that the SSE would not result in such failure. RG 1.29, Positions C.1 and C.2, assures that the ICAS will remain functional during an earthquake and provide compressed air necessary for the actuation and control of safety-related equipment. 3. GDC 5 prohibits the sharing of SSCs among