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:
tem 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. 5. The ESFVS is reviewed to ensure that adequate means is provided in the system design for control of airborne particulate material (dust) accumulation. The system arrangement is reviewed to verify that a minimum of seven meters (20 feet) exists from the bottom of all fresh air intakes to grade elevation, or that electrical cabinets are provided with suitable seals or gaskets. 6. The reviewer verifies that a suitable environment is demonstrated to be maintained in areas served by the ESFVS for the duration of a station blackout event and the associated recovery period with or without credit for ESFVS operation, as applicable. Where applicable, the functionality of equipment necessary to cope with the event under the expected environmental conditions and the habitability of areas where operator actions are performed should be appropriately addressed during the review as described in Regulatory Guide 1.155, position C.3.2.4. Where portions of the ESFVS are credited to function for station blackout, the reviewer verifies that the ESFVS has been designed so that system functions will be performed as required in the event of a station blackout, that the ESFVS has sufficient capacity and capability to maintain a suitable environment for the duration of a station blackout event and the associated recovery period, and that failure of non-required portions of the ESFVS will not adversely affect the functioning of required equipment. As necessary, the reviewer interfaces with other reviewers as described in subsection I of this SRP section to evaluate the instrumentation and electrical provisions for ESFVS functionality in the event of a station blackout and also to ensure that appropriate instrumentation and