Document: NUREG-0800
Document ID: 8ec28e2c-84e9-408b-afcb-1838fbfe7efc
Document Type: srp
Title: ENGINEERED SAFETY FEATURE VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550041.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.5
CFR Part: 
CFR Title: 

Content:
icate points of change in design classification. 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 fans or isolation dampers that would be required by this program. 9.4.5-10 Revision 3 - March 2007 3. The reviewer verifies that the system has been designed so that system function will be maintained as required in the event of adverse environmental 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 nonseismic SSCs located close to essential portions of the system will not preclude operation of the essential portions of the ESFVS. 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 classifications for structures and systems. B. The essential portions of the ESFVS are protected from the effects of floods, hurricanes, tornadoes, and internally- and externally-generated missiles. Flood protection and missile protection criteria are evaluated in detail in SRP Chapter 3. The locations and designs of the system, structures, and fan rooms (cubicles) are reviewed to determine that the degree of protection provided is adequate. A statement to the effect that the system is located in a tornado-, missile-, and flood-protected seismic Category I structure or that system components will be located in individual cubicles or rooms that will withstand the effects of both flooding and missiles is acceptable. C. The total system has the capability to detect and control leakage of airborne contamination from the system. The design is