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:
eting 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 suitable environmental conditions for performance of safety functions.56 3. Compliance with GDC 5 requires that structures, systems, and components important to safety shall not be shared among nuclear power units unless it can be shown that such sharing will not significantly impair their ability to perform their safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. With regard to the CRAVS, GDC 5 requires the component parts of the CRAVS be essentially independent in order to ensure that an accident in one unit of a multiple-unit facility will not propagate to other units. Therefore the CRAVS for each unit should be designed to accommodate the load resulting from accident conditions. At the same time, the operating environment of equipment in the control room(s) of the unaffected unit(s) must be maintained within specified limits. Meeting the requirements of GDC 5 provides assurance that a failure or accident in one unit will not affect additional units of a multiple-unit site.57 4. Compliance with GDC 19 requires that the control room remain functional to the degree that actions can be taken to operate the nuclear power unit safely under normal conditions and to maintain the plant in a safe condition under accident conditions, including loss-of-coolant accidents. With regard to the CRAVS, GDC 19 requires that adequate protection against radiation and hazardous chemical releases be provided to permit access to and occupancy of the control room under accident conditions. Regulatory Guides 1.78 and 1.95 provide guidance acceptable to the staff for meeting these control room occupancy protection requirements. DRAFT Rev. 3 - April 1996 9.4.1-8 Meeting the requirements of GDC 19 provides assurance