Document: NUREG-0800
Document ID: 8ec28e2c-84e9-408b-afcb-1838fbfe7efc
Document Type: srp
Title: ENGINEERED SAFETY FEATURE VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550041.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.5
CFR Part: 
CFR Title: 

Content:
at will withstand the effects of both flooding and missiles is acceptable. C. The total system has the capability to detect and control leakage of airborne contamination from the system. The design is acceptable if it meets the following conditions: i. The P&IDs show the capability for isolating nonessential portions of the ESFVS by two automatically-actuated isolation dampers in series. ii. The ESFVS has provisions to actuate ventilation equipment in the engineered safety feature areas before ambient temperatures exceed design-rated temperatures of the components. D. Essential components and subsystems can function as required in the event of a loss of offsite power. The system design will be acceptable if the ESFVS meets minimum system requirements as stated in the SAR, assuming 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 verify that for each ESFVS component or subsystem affected by the loss of offsite power, the resulting system performance will not affect the capability of any engineered safety feature equipment. Statements in the SAR and 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, ESFVS drawings, and failure modes and effects analyses in the SAR are reviewed to ensure 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 ensure function of 9.4.5-11 Revision 3 - March 2007 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