Document: NUREG-0800
Document ID: b4dc2da5-bdfa-4120-9cf3-b2918a366a3e
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350557.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
CFR Part: 
CFR Title: 

Content:
dampers in series separate nonessential .portions and components from the essential portions. b. Essential portions of the CRAVS, including the isolation dampers separating essential from nonessential portions are classified seismic Category I. Compone~nt and system descriptions in the SAR that identify mechanical and performance characteristics are reviewed to verify that the above classifications have been included and that the P&IDs indicate points of change in design classification. The review for seismic design is performed by SEB and the review for seismic and quality group classification is performed by MEB as indicated in subsection I of the SRP section. c. Design provisions have been made that permit appropriate inservice inspection and functional testing of system components important to safety. It is acceptable if the SAR information delineates a testing and inspection program and if the system drawings show the necessary test recirculation loops around pumps or isolation valves that would be required by this program. 3. The reviewer verifies that the system has been.designed so that system function will be maintained as required in the event of adverse environ- mental phenomena or loss of offsite power. The reviewer evaluates the system, using engineering judgment and the results of failure modes and effects analyses to determine that: a. The failure of nonessential portions of the system or of other nonessential systems, structures, or components located close to essential portions of the system will not preclude operation of the essential portions of the CRAVS. Reference to SAR sections describing site features and the general arrangement and layout drawings will be necessary, as well as the SAR tabulation of seismic design classifi- cations for structures and systems. Statements in the SAR that verify that the above conditions will be met are acceptable at the CP stage. b. The essential portions of the CRAVS are protected from the effects of floods,