Document: NUREG-0800
Document ID: 010ad62f-cd7b-4f06-9f81-a781faf5701b
Document Type: srp
Title: ENGINEERED SAFETY FEATURE VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070560.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.5
CFR Part: 
CFR Title: 

Content:
o ensure 6 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. The ASB SPLB also reviews safety-related portions of the ESFVS with respect to the 7 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. Capability of the system to circulate sufficient air to prevent accumulation of inflammable or explosive gas or fuel-vapor mixtures from components such as 8 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 (dust) accumulation. 3. The SPLB also reviews the ESFVS with respect to ensuring 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.9 9.4.5-3 DRAFT Rev. 3 - April 1996 4. The PERB, as part of its secondary review responsibility for Standard Review Plan (SRP) Section 9.4.5, reviews safety-related portions of the ESFVS with respect to the following:10 a. The capability of the ESFVS to detect and control leakage of