Document: NUREG-0800
Document ID: 2cde5121-7267-482f-82a5-b36a0b9fc741
Document Type: srp
Title: ENGINEERED SAFETY FEATURE VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350029.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.5
CFR Part: 
CFR Title: 

Content:
edundant subsystems, each having an iden- tical essential (safety features) portion. For cases where there are variations from this typical arrangement, the reviewer would adjust the review procedures given below. However, the system design would be required to meet the accep- tance criteria given in subsection II. The reviewer will select and emphasize material from this SRP section as may be appropriate for a particular case. 1. The SAR is reviewed to verify that the system description and piping and instrumentation diagrams (P&IDs) show the ESFVS equipment used for normal operation, and the ambient temperature limits for the areas serviced. The system performance requirements are reviewed to determine that they limit allowable component operational degradation (e.g., loss of function, damper leakage) and describe the procedures that will be followed to detect and correct these conditions. The reviewer, using results from failure modes and effects analyses as appropriate, will determine that the safety- related portion of the system is capable of sustaining the failure of any active component. 2. The system P&IDs, layout drawings, and component descriptions and charac- teristics are then reviewed to determine that: 9.4.5-4 Rev. 2 - July 1981 a. Essential portions of the ESFVS are correctly identified and are isolable from nonessential portions of the system. The P&IDs are reviewed to verify that they clearly indicate the physical divisions between such portions and indicate design classification changes. System drawings are also reviewed to see that they show the means for accomplishing isolation, and the system description is reviewed to identify minimum performance requirements for the isolation dam- pers. 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 ESFVS, including the