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

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Updated Final Safety Analysis Report - (STS-004-002)Since the constant volume flow from the buffer charge seal pumps was in excess of the flowsupplied to the seals and to the primary system as makeup, the excess flow was returned to thebuffer seal surge tank through bypass control valve (SL-9V). Valve SL-9V was designed tocontrol the bypass flow when the primary system was at normal operating pressure. During lowpressure operation, a manual control valve (SL-60V), connected in parallel with valve SL-9V,was used to help control the flow.Inside the lower reactor compartment, the buffer seal outlet line contains a diaphragm operatedvalve (SL-8V). It was operated by the differential pressure controller (PICA/SL-1) whichregulates bypass control valve SL-9V. If the differential pressure between the buffer sealsupply header and the primary system became low, valve SL-8V automatically closed toprevent primary system water from leaking out through the seals.A flow nozzle (PIA/SL-4) is located on the buffer seal water return line in the port stabilizerroom and allowed monitoring of the total buffer seal return flow.In the port stabilizer room, the bypass flow and the seal return flow join and flow to the bufferseal coolers (SL-C1 and SL-C2). The common line contains a flow nozzle which was used tomonitor the total return flow to the buffer seal surge tank.The buffer seal coolers removed heat added to the buffer seal water by the buffer seal chargepumps. The coolers are shell and tube heat exchangers. Buffer seal water flowed through thetube side fluid and cooling water from the intermediate cooling system flowed through the shellside. The tubes are made of stainless steel and the shell is made of carbon steel.A relief valve (SL-61V), set at 100 psig, is connected across the primary side of the coolers.This valve was provided to relieve excessive pressures if the isolation valves (SL-33V, SL-34V,SL-35V and SL-36V) on the buffer seal coolers were closed when the flow path from thecontrol rod buffer seals or the bypass line was still open.9.2.3 Hydrogen Addition (HA) System9.2.3.1 FunctionAll of the hydrogen addition system (HA) equipment is deactivated, disabled, drained andperforms no active function.The HA system provided a hydrogen gas blanket on the water in the buffer seal surge tank.This gas blanket maintained a hydrogen concentration in the primary system water of 20 to 40cc per liter at standard temperature and pressure (STP). The dissolved hydrogen combined withthe oxygen resulting from radiolytic decomposition. Maintaining a low oxygen content in theprimary water reduced the corrosion rate of the primary system materials to a minimum.Hydrogen was added to the buffer seal surge tank.9.2.3.2 DescriptionThe HA system consists of standard 200 standard cubic feet (SCF) hydrogen cylinders, pressureregulators, valves, piping and instrumentation.The hydrogen cylinders (HA-T1, HA-T2 and HA-T3) and regulators (HA-F1 and HA-F2) arelocated in a special vented locker on the forward weather deck. The hydrogen was introducedinto buffer seal surge tank (SL-T1) by manual operation of the HA system. Distribution nozzleslocated below normal water level in the tank disperse the hydrogen in the water. A gasstripping column located on top of the tank helped dissolve hydrogen into the water entering thetank from the PP system. The hydrogen pressure in the buffer seal surge tank was maintainedRev. VI 102
Updated Final Safety Analysis Report - (STS-004-002)by two gas pressure regulators, which were normally operated manually but were also equippedfor automatic operation.A relief valve (HA-10V), set at 60 psig, was provided to relieve the pressure in the hydrogencharge line if the pressure regulator fails. Additionally, the two check valves (HA-18V andHA-19V), connected in series downstream of the regulators, acted as a flame arrestor.A solenoid valve (HA-21V) downstream of the relief valve would have isolated the hydrogenmanifold when the hydrogen supply line was accidentally severed. The solenoid valve wasoperated by a pressure switch (HA-10) located downstream. This switch was set to actuatewhen the pressure drops to 2 psig. The line from the hydrogen addition locker to the buffer sealsurge tank is enclosed by a specially vented outer pipe which further minimizes any hazardsassociated with hydrogen.9.2.4 Primary Relief (PR) System9.2.4.1 FunctionAll of the primary relief (PR) system equipment is deactivated, disabled, drained and performsno active function.The PR system prevented pressures in the primary system, steam generators and primary looppurification (PP) system from exceeding the design code allowable pressures. Additionally, thePR system provides a means of collecting and condensing effluent from the relief valves.9.2.4.2 DescriptionThe PR system consists of:Safety and relief valves located on the steam generators (PR-12V, PR-14V, PR-16V andPR-17V), the pressurizer (PR-1V, PR-3V, or PR-24V), the PP system letdown piping (PR-4V) and the effluent condensing tank (PR-T1).Heat exchangers (PR-C1 and PR-C2) to cool pressurizer steam which may have beenleaking through the safety valves.An effluent condensing tank (PR-T1), partially filled with water, to receive and condensethe discharge from the pressurizer safety valves or to receive the discharge from the PPsystem relief valve.The pilot operated relief valve (PR-3V) and the two safety valves (PR-1V & PR-24V) for thepressurizer are discussed in Chapter 7. A low pressure rupture disc (PR-F11), set to relieve at113 psig, is located on the main discharge line of the pressurizer safety valves downstream ofthe junction of the diaphragm valve and the spring-loaded valve lines. Two small heatexchangers, connected in parallel, are located on bypass lines around the rupture disc in themain discharge line. The heat exchangers cool steam that intermittently leaked through thesafety valves. Cooling water for the heat exchangers was supplied from the intermediatecooling water (CW) system.If a safety valve opened, the rupture disc would have burst to relieve fluid into the effluentcondensing tank. A check valve (PR-6V) prevented backflow from the effluent condensingtank to the relief valves.The effluent condensing tank is a horizontal cylindrical tank with elliptical heads. The overalldimensions are 6 feet 8 inches long by 4 feet in diameter. It is constructed of carbon steel andthe inside was lined with a baked phenolic resin coating to retard corrosion. The tank pressurewas relieved to the containment by a spring-loaded, self-actuated safety valve (PR-7V) set at 50Rev. VI 103
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10 CFR 50.71(e) - Maritime Administration - U.S. Department of ...

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