10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

Updated Final Safety Analysis Report - (STS-004-002)The section which vents equipment in the containment vessel.The section which vents equipment in the secondary shield.Potentially radioactive gases from equipment inside the containment were collected in two ventheaders and piped to the containment drain tank (PD-T4). The containment drain tank was inturn vented to a manifold (WL-F6) located in the lower reactor compartment. The vent line tothe gas manifold contains two diaphragm-operated valves (WL-20V and WL-110V), whichautomatically close in the event of high containment vessel pressure.The following equipment located inside the containment vessel could be vented to thecontainment drain tank:Pressurizer;Primary pumps;Steam generators (primary side);Effluent condensing tank;Secondary side of the purification letdown coolers; and,Reactor head.The remote-operated vent (WL-1V) for the pressurizer was provided to avoid radioactive gasaccumulation in the pressurizer. This vent operated as a pressurizer bleed and was piped to thePP system so that radioactive and noncondensible gases would be transferred to the buffer sealsurge tank.The equipment in the lower reactor compartment vented to manifold WL-F6. From themanifold, the gases flow through a line to the inlet duct of the ventilation filters.Potentially radioactive gas sources outside the containment vessel consisted of:The PP system demineralizers;The PP system effluent filters;The buffer seal surge tank;The lab waste tank (PD-T1); and,The makeup storage tanks (PD-T2 and PD-T3).The vent lines for the buffer seal surge tank, lab waste tank (PD-T1) and the makeup storagetanks (PD-T2 and PD-T3) contain flame arrestors to minimize the possibility of hydrogenexplosions.The radiation monitoring system monitored the radioactivity level of the containment air, thereactor compartment air, the vent gas manifold discharge and the stack discharge on both sidesof the filters. This monitoring determined the activity released to the environment.Rev. VI 119