Document: NUREG-0800
Document ID: 92c0723c-167f-4101-b17a-ff7f705327f0
Document Type: srp
Title: AUXILIARY AND RADWASTE AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350560.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.3
CFR Part: 
CFR Title: 

Content:
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 ARAVS, 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 classification has been included, and that the P&IDs indicate any points of change in design classifica- tion. 3. The reviewer verifies that the essential portion of the system has been designed so 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 ARAVS, will not preclude operation of the essential portions of the ARAVS. 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. Statements in the SAR that verify that the above conditions are met are acceptable. (CP) b. Components and subsystems, necessary for preventing the release of radioactive contaminants, can function as required in the event of loss of offsite power. The system design will be acceptable if the ARAVS meets minimum system requirements as stated in the SAR assuming a failure of a single active component within the system or in the 9.4.3-4 Rev. 2 - July 1981 auxiliary