Document: NUREG-0800
Document ID: 3263aa5f-b2bf-46fe-b625-e0ffd142404d
Document Type: srp
Title: TURBINE AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070557.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.4
CFR Part: 
CFR Title: 

Content:
isolation, and the system description is reviewed to identify minimum performance requirements for the 60 isolation dampers. For the typical system, the drawings and description are reviewed to verify that two automatically operated isolation dampers in series separate nonessential portions and components from the essential portions. b. Essential portions of the TAVS, including the isolation dampers separating essential from nonessential portions, are classified seismic Category I. Component and system descriptions in the SAR that identify mechanical and performance characteristics are reviewed to verify that the above seismic classifications have been included, and that the P&IDs indicate any 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. Conformance with the industry standard ASTM D3803-89, "Standard Test Methods for Radiological Testing of Nuclear-Grade Gas-Phase Adsorbers," should be demonstrated. It is acceptable if the SAR information delineates a testing and 61 inspection program and if the system drawings show the necessary test 9.4.4-7 DRAFT Rev. 3 - April 1996 recirculation loops around fans or isolation dampers that would be required by this program.62 3. The reviewer verifies that the safety-related portion of the system has been designed so 63 that system function will be maintained as required, in the event of an earthquake 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 systems not designed to seismic Category I standards and located close to essential portions of the system, or of nonseismic Category I structures that house, support, or are close to essential portions of the TAVS, will not preclude operation of the essential portions