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:
s 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 nuclear power units unless such sharing can be shown not to significantly impair their ability to perform safety functions, including, in an accident in one unit, an orderly shutdown and cool-down of the remaining units. The ICAS provides compressed air or nitrogen required to actuate or control equipment that performs safety-related functions during normal operations, transients, or accidents. The ICAS must be designed such that there is no compromise of the ability of systems and components to perform these safety-related functions for each unit regardless of CAS equipment failures or other events that may occur in other units. GDC 5 requirements provide assurance that unacceptable effects of equipment failures or other events occurring in any unit of a multi-unit site will not propagate to unaffected units. 4. 10 CFR 50.63 requires that each light-water-cooled nuclear power plant licensed to operate must be able to withstand a station blackout for a specified duration and recover from it. Depending on the design-specific approach for demonstrating ability to withstand and recover from a station blackout, the CAS may provide compressed air or nitrogen to actuate or control equipment necessary for core cooling and decay heat removal or maintain containment integrity following a station blackout. RG 1.155 describes a method acceptable to the staff for compliance with 10 CFR 50.63. RG 1.155, Position 3.2.2, indicates that the capability of all systems and components necessary for core cooling and decay heat removal following a station blackout should be determined, including compressed air capacity, when determining the plant’s capability to cope with a station blackout. RG 1.155, Position 3.3.3, provides guidance for the use of alternate compressed air sources if the