Document: NUREG-0800
Document ID: 50c5f9b6-d85c-4012-a8e9-48eaaafff93e
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550045.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
CFR Part: 
CFR Title: 

Content:
y and capability for coping with a station blackout event will be considered acceptable if the guidance of RG1.155, including position C.3.2.4 is applied appropriately. 9.4.1-6 Revision 3 - March 2007 Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 2, as to system capability to withstand the effects of earthquakes, requires that SSCs important to safety be designed to withstand the effects of a design-basis earthquake without loss of capability to perform safety functions. The function of the CRAVS is to provide a controlled environment for the comfort and safety of control room personnel during normal operation, anticipated operational occurrences, and during and after postulated accidents, including the coincidental loss of offsite power. This requirement ensures that the control room will remain functional in the event of a design basis earthquake. Regulatory Guide 1.29 provides guidance acceptable to the staff for meeting these control 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. 2. GDC 4 requires that SSCs important to safety be designed to accommodate the effects of, and to be compatible with, environmental conditions of normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. GDC 4 also requires that SSCs important to safety be appropriately protected against dynamic effects (including those of missiles, pipe whipping, and discharging 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