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:
ration of the essential portions of the CRAVS. Reference to SAR sections describing site features and 71 the general arrangement and layout drawings will be necessary, as well as the SAR tabulation of seismic design classifications for structures and systems. Statements in the SAR that verify that the above conditions will be met are acceptable at the CP stage.72 9.4.1-11 DRAFT Rev. 3 - April 1996 b. The essential portions of the CRAVS are protected from the effects of floods, hurricanes, tornadoes, and internally or and externally generated missiles. Flood 73 protection and missile protection criteria are discussed and evaluated in detail under the Section 3 series of the SRP. The location and the design of the system, structures, and pump fan rooms (cubicles) are reviewed to determine that the 74 degree of protection is adequate. A statement to the effect that the system is located in a seismic Category I structure that is tornado missile and flood protected, or that components of the system will be located in individual seismic Category I cubicles or rooms that will withstand the effects of both flooding and 75 missiles is acceptable. c. The CRAVS will maintain control room habitability in the event of release of airborne contamination that may enter the control room via the intake vents. Final determination of the identification and the concentration of the contaminants will be completed at the OL or COL stage of review.76 cd. The total system has the capability to detect and control leakage of airborne contamination into the system. It is acceptable if the following conditions are met: (1) The system P&IDs show monitors located in the system intakes that are capable of detecting radiation, smoke, and toxic chemicals. The monitors should actuate alarms in the control room. (2) The capability for isolation of nonessential portions of the CRAVS by two automatically actuated dampers in series is shown on the P&IDs. (3) The CRAVS has provisions for an internal