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:
ompressed air supplies that may have less restrictive air quality requirements. ANSI/ISA-S7.3-R1981 provides air quality criteria that, if followed for the ICAS and backup compressed air sources, will help ensure that ICAS and the equipment supplied from the ICAS will reliably perform their intended safety functions.62 2. GDC-2 requires, in relevant part, that structures, systems, and components important to safety be designed to withstand the effects of natural phenomena, including earthquakes, without loss of capability to perform their safety functions. The ICAS provides compressed air or nitrogen required to actuate or control equipment that perform safety- related functions during normal operations, transients, or accidents. Based on reviewing a number of safety analysis reports, a seismic design classification system was developed 9.3.1-7 DRAFT Rev. 2 - April 1996 for identifying those plant features that should be designed to withstand the effects of the safe shutdown earthquake (SSE). Regulatory Guide 1.29 describes an acceptable method for identifying and classifying those features of light-water reactor nuclear power plants that should be designed to withstand the effects of the SSE. Those structures, systems and components that should be designed to remain functional if the SSE occurs have been designated as Seismic Category 1. Position C.1 of the Regulatory Guide states that systems required for safe shutdown, including their foundations and supports, are designated as Seismic Category I and should be designed to withstand the effects of the SSE and remain functional. Position C.2 of the Regulatory Guide states that structures, systems, or components whose continued function is not required but whose failure could reduce the functioning of any seismic Category I plant feature to an unacceptable safety level, or could result in incapacitating injury to occupants of the control room, should be designed and constructed so that the SSE would not cause such