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:
ion, the ESFVS design must withstand dynamic effects associated with postulated accidents. 9.4.5-7 Revision 3 - March 2007 Meeting these requirements provides assurance that engineered safety features will not fail to operate as designed, thus providing protection against loss of core cooling and/or containment integrity. 3. Compliance with GDC 5 requires that structures, systems, and components important to safety shall not be shared between nuclear power units unless it can be shown that such sharing will not significantly impair the ability of each unit to perform its safety function. In the event of an accident in one unit, the remaining units must be able to implement an orderly shutdown and cooldown. With regard to the ESFVS, the plant design should provide for essential independence of its components, ensuring that an accident in one part of a multiple-unit facility will not propagate to unaffected units. Therefore, the ESFVS for each unit should be designed to accommodate accident conditions. At the same time, the operating environment of equipment associated with unaffected units must be maintained within specified limits. Meeting these requirements provides assurance that a failure will not affect additional units of a multiple-unit facility. 4. Compliance with GDC 17 requires that onsite and offsite electrical power be provided to permit functioning of structures, systems, and components important to safety. Each electric power system must provide sufficient capacity to ensure that specified fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences. In addition, core cooling, containment integrity, and other vital functions must be maintained in the event of postulated accidents. With regard to the ESFVS, the plant design should ensure that electrical contacts and relays in diesel generator rooms are protected from dust, dirt, and grit. For example, contacts and