Document: NUREG-0800
Document ID: ef1386f3-1e51-490d-9646-d1018f39b2c8
Document Type: srp
Title: TURBINE AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350572.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.4
CFR Part: 
CFR Title: 

Content:
as required to assure that this review procedure is complete. As a result of various TAVS designs proposed by applicants, there will be varia- tions in system requirements. For the purpose of this SRP section, a typical system is assumed which has fully redundant subsystems, each having an identical essential (safety-related) portion. For cases where there are variations from 9.4.4-3 Rev. 2 - July 1981 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 selects and emphasizes 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 TAVS equipment used for normal operation, and the ambient temperature limits for the areas serviced. The system performance requirements are reviewed to determine the allow- able component operational degradation (e.g., loss of function, damper leakage) and the procedures that will be followed to detect and correct these conditions. The reviewer, using results from failure modes and effects analyses as appropriate, determines that the system is capable of sustaining the failure of any active component that is required for the prevention of unacceptable releases of radioactive contaminants to the environment. 2. The system P&IDs, layout drawings, and component descriptions and character- istics are then reviewed to determine that: a. Essential portions of the TAVS 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 each portion and indicate changes in design classification. System drawings are also reviewed to verify that the means provided for accomplishing isolation and to identify minimum performance require- ments for the isolation