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:
is acceptable. (CP) 9.4.4-4 Rev. 2 - July 1981 b. Components and subsystems necessary for preventing unacceptable releases of radioactive contaminants can function as required in the event of loss of offsite power. The system design will be acceptable if the TAVS meets minimum system requirements as stated in the SAR assuming a failure of a single active component, within the system itself, or in the auxiliary electric power source which supplies the system. The SAR is reviewed to see that, for each TAVS component or subsystem affected by the loss of offsite power, the resulting system flow capacity will not cause the loss of direction of air .flow from areas of low potential radioactivity to areas of higher potential radioactivity. Statements in the SAR and the results of failure modes and effects analyses are considered in verifying that the system meets these requirements. This will be an acceptable verification of system functional reliability. 4. The descriptive information, P&IDs, TAVS drawings, and failure modes effects analyses in the SAR are reviewed to assure that essential portions of the system can function following design basis accidents assuming a concurrent single active failure. The reviewer evaluates the analyses presented in the SAR to assure function of required components, traces the availability of these components on system drawings, and checks that the SAR contains verification that minimum system. isolation or filtration requirements are met for each accident situation for the required time spans. For each case the design will be acceptable if minimum system requirements are met. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and the review supports conclusions of the following type to be included in the staff's safety evaluation report: The turbine area ventilation system (TAVS) includes all components and ducting from air intake to the point of discharge. All portions of the system whose