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

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Updated Final Safety Analysis Report - (STS-004-002)surrounded with 2 inches of lead shielding. The demineralizer effluent entered the filterthrough a side connection near the bottom, flowed upward through the filter elements and outthrough a side connection near the top. The filter elements consist of three hollow cartridges ofsintered stainless steel. The mean pore opening in the cartridges was 10 microns. A boltedcover plate was located on the top of the unit so that the entire filter assembly can be removed.Isolation valves (PP-30V, PP-31V, PP-37V and PP-38V) are located on each side of the filters.No documentation indicates that the filter assemblies have been removed following permanentdefueling.A high differential pressure across the filters indicated that backflushing was required to removethe filtered material. Flush water was supplied from the combined condensate pump dischargein the engine room. The water first passes through a rotameter (PP-F18) in the engine room andthen through individual backflushing lines for each unit. Manual valves (PP-49V and PP-50V)on the backflush lines connect to the normal outlet nozzle at the top of the filter. About 30 gpmof flush water flows counter to the normal flow path. The flush water leaves the filter through adrain connected to the laboratory waste tank.The PP system water flows into the top of the buffer seal surge tank (SL-T1) after leaving theeffluent filters. This line contains a flow nozzle from which flow was measured by means of adifferential pressure cell (FI/PP-10). The detected flow was indicated in the main control room.When fresh makeup water was required for the buffer seal surge tank, it was added by the PPsystem upstream of the demineralizers. Makeup water was normally supplied from the outlet ofthe combined condensate polishing demineralizer in the secondary system. When additionswere made, manual control valves (PP-73V and PP-74V) and a local flow indicator, locatednear the polishing demineralizer on the lower level of the engine room, were used for makeupflow control.A second source of makeup water was the primary system water stored in the makeup storagetanks (PD-T2 and PD-T3). During primary system heatup as dense cold water expanded, it wasstored in PD-T2 and PD-T3 for use during subsequent cooldown of the primary system. Theprimary makeup pump (PD-P2) was used to add the makeup water to the upstream side of thedemineralizers. A flow nozzle was located in the makeup line.Three sets of relief valves were provided to prevent excessive pressures in the PP system. Arelief valve (PR-4V), set at 150 psig, is connected to the main piping downstream of the flowcontrol valves and discharged to effluent condensing tank (PR-T1). Each demineralizer had arelief valve (PP-63V, PP-64V or PP-65V), set at 60 psig, on the outlet line. The three valvesdischarged into a common header which was routed to the backflush outlet nozzle for effluentfilter (PP-E5). Each effluent filter has a relief valve (PP-62V or PP-61V), set at 60 psig, whichdischarged to the buffer seal surge tank.The PP system supplied water for the two sampling system loops. The supply line for one loopwas connected to the piping between the letdown coolers and the flow control valves. Thereturn line for this loop was connected to the main purification piping between the flow controlvalves and the demineralizers. The supply line for the second sample loop was connected to themain line between the demineralizers and effluent filters; the return water for the second loopflows into the buffer seal surge tank.The pressurizer could be vented to the PP system through a 1-inch line (WL-2) which wasconnected to the PP system piping between the letdown coolers and the flow control valvenetwork. A diaphragm operated valve (WL-1V) was used for the venting operation.Rev. VI 98
9.2.2 Buffer Seal (SL) System9.2.2.1 FunctionUpdated Final Safety Analysis Report - (STS-004-002)All of the buffer seal (SL) system equipment is deactivated, disabled, drained and performs noactive function.The principal function of the SL system was to supply purified high pressure water to thecontrol rod drive buffer seals. The high pressure water maintained a seal at penetrations in thereactor head thus preventing primary water leakage. The secondary functions of the SL systemincluded the following:Supplying high purity makeup water from the PP system via the buffer seal surge tank (SL-T1) to the primary system;Providing water circulation through the reactor and purification system when the letdowncoolers were used to remove reactor decay heat;Maintaining dissolved hydrogen in the primary water;Cooling the CRD extension shafts at the RPV head; and,Removing expansion water from the primary system during reactor heatup.9.2.2.2 DescriptionThe SL system consists of the buffer seal surge tank, two booster pumps, three charge pumpswith desurgers, two buffer seal coolers and associated valves and piping.The buffer seal surge tank (SL-T1) was the collection point for the water flowing into the SLsystem from the primary loop purification (PP) system, for water returning from the control rodbuffer seals and for the bypass flow around the buffer seals. This is a stainless steel verticalcylindrical tank designed for 186 psig. The tank is 13½ feet tall, 4 feet ID and has a volume of87 cubic feet. The tank was operated with a hydrogen overpressure of about 30 psig. The gasstripping column, mounted on top of the buffer seal surge tank, is filled with polyethylenepacking. As the water flowed down the column, the water was saturated with hydrogen.The buffer seal surge tank is located in the port forward area of the lower reactor compartment.The main outlet is routed through the secondary shield to the suction of the two buffer sealbooster pumps (SL-P4 and SL-P5), which are mounted on the forward bulkhead of the portstabilizer room. Another line, connected to the tank outlet and containing a diaphragm operatedvalve (PD-32V), was used to drain excess water to the makeup storage tanks (PD-T2 and PD-T3) in the equipment drain and waste collection (PD) system. The valve was operated from themain control room. The draining operations were normally performed during heatup of theprimary system to remove the excess expansion water.The inlet to the buffer seal surge tank from the buffer seal coolers contains a check valve whichprohibited flow out of the surge tank in the event of a failure in the buffer seal coolers or bufferseal charge pumps.The buffer seal surge tank could be vented to a gas manifold in the gaseous waste disposal andcollection (WL) system by means of a diaphragm operated valve (WL-34V). This valve wasactuated by a switch located on the instrument panel at the sampling station in the Cold WaterChemistry Lab. The tank has a relief valve (SL-10V) to prevent excessive pressures.Pressure, temperature and water level instrumentation were provided for the tank. The waterlevel was detected by two differential pressure cells (LIA-SL5) connected to separatestandpipes. The temperature of the water in the surge tank was detected with a sealed gas-filledRev. VI 99
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