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:
-related portions of the system are reviewed to ensure that: A. A single active failure cannot result in loss of the system functional performance capabilities and B. Failures of nonseismic Category I equipment or components will not result in damage to essential portions of the ESFVS. 2. Safety-related portions of the ESFVS are also reviewed with respect to the following: A. The ability of the heating and cooling systems to maintain a suitable ambient temperature range in the areas serviced, assuming proper performance of equipment contained in these areas; B. Provisions to detect the need for isolation and to isolate portions of the system in the event of failures or malfunctions; C. The ability of the safety features equipment in the areas being serviced by the ventilation system to function under the worst anticipated degraded ESFVS system performance; D. The capability of the system to circulate sufficient air to prevent accumulation of flammable or explosive gas or fuel-vapor mixtures from components such as storage batteries and stored fuel; E. The capability of the system to automatically actuate components not operating during normal conditions or to actuate standby components (redundant equipment) in the event of a failure or malfunction as needed; and F. The capability of the system to control airborne particulate material accumulation. 3. The ESFVS is also reviewed to ensure that suitable environmental conditions are maintained in areas containing equipment required to function for a station blackout. This review includes verification that failure of nonrequired equipment will not preclude operation of required equipment when preferred and onsite emergency AC power is lost. 4. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the staff reviews the applicant's proposed ITAAC associated with the structures, systems, and components (SSCs) related to this SRP section in accordance