Document: NUREG-0800
Document ID: 9aa9f059-274f-4f61-8c7e-88e13eb69bd0
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070540.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
CFR Part: 
CFR Title: 

Content:
rol room occupancy protection requirements. Meeting the requirement of GDC 2 provides assurance that the habitability of the control room area will be maintained and that equipment in the control room will operate as designed, thereby minimizing the potential for loss of function.55 2. Compliance with GDC 4 requires that structures, systems, and components important to safety be designed to accommodate the effects of, and to be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. GDC 4 also requires that structures, systems, and components important to safety be appropriately protected against dynamic effects (including those of missiles, pipe whipping, and discharging 9.4.1-7 DRAFT Rev. 3 - April 1996 fluids) that could result from equipment failures or from events and conditions outside the nuclear power unit. The function of the CRAVS is to provide a suitable and controlled environment for the control room during normal operation, anticipated operational occurrences, and during and after postulated accidents, including loss of offsite power. To ensure performance of these functions under accident conditions, portions of the CRAVS must be designed to accommodate accident environmental effects and be appropriately protected from dynamic effects associated with postulated accidents. The requirements of GDC 4 are imposed to ensure that control room area systems and components important to safety (with environmental support from the CRAVS) and safety-related portions of the CRAVS are designed to address the expected environmental conditions and dynamic effects associated with the specified events and conditions for which they are required to function. Meeting the requirements of GDC 4 provides assurance that the control room area ventilation system will support the functioning of systems and components important to safety by providing and maintaining