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

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Updated Final Safety Analysis Report - (STS-004-002)The instrument air system provided clean, dehumidified air at various pressures for the followinguses:Main steam stop valve control (80 to 100 psig);Ship’s air conditioning control (80 to 90 psig);Diesel oil tank level indicators (40 psig);Control valves and tank level indicators (40 psig);Main control console in the main control room, signal transmitters and auxiliary panels A & B(30 psig);Quantichem analyzer (20 psig); and,Containment vessel personnel air supply (via CO analyzer).The instrument air system consists of dual air intake filters (NI-Fl and NI-F2), instrument aircompressors (NI-P1 and NI-P2) and instrument aftercoolers (NI-C1 and NI-C2) which dischargedinto the instrument control air tank (NI-T1). From the instrument control air tank, the air wasdistributed to the two air filters (NI-F6 and NI-F7) and to the pressure reducing network whichsupplied the various shipboard air services.The two air compressors are vertical, reciprocating, water-cooled units that were belt driven by 20hp, 440-volt electric motors. Each compressor has a rated output of 80 cfm at 100 psig whenoperating at 537 rpm. Cooling water (with chromates to inhibit rust) was supplied to the compressorand aftercooler by the intermediate cooling water (CW) system. A pressure control valve is installedin the cooling water inlet line to prevent overpressure of the compressors in the event that the CWsystem pressure was raised for emergency cooling.A manually operated crossover connection is provided for the ship service air system in the event oftotal instrument compressor failure. Normal operation called for one of the compressors to be inoperation with the second unit on standby. Local and remote instrumentation is provided to alert theoperators to abnormal conditions.8.6.2 Waste Dilution and Disposal (WD) SystemAll of the waste dilution and disposal (WD) system equipment is deactivated, disabled and performsno active function.The WD system, located in the engine room, consists of a pump, regulator, valves and piping. Thefunction of the WD system was to transfer radioactive waste water from the equipment drain andwaste collection (PD) system and to accurately measure and discharge waste water to thehydrosphere through the main condenser circulating system.A positive-displacement reciprocating pump that had a discharge capacity of 0 to 30 gph wasarranged to take suction from the PD system; it discharged through a pressure control valve (WD-5V) to the salt water circulating system inlet plenum of the main condenser. Operation of the systemcalls for the waste transfer pump (PD-P1) to discharge to the suction side of the dilution pump (WD-P1) in the starboard buffer seal charge pump room. The dilution pump discharge rate was varied asrequired so that the overboard discharge activity was below acceptable limits for the zone in whichthe vessel was sailing.The pressure regulator (WD-5V) on the dilution pump discharge was set at 100 psig; this precludedinadvertent direct discharge by the transfer pump because the setting was above the shutoff head ofRev. VI 88
Updated Final Safety Analysis Report - (STS-004-002)the transfer pump. Sampling connections are provided to check the effluent activity at the dilutionpump discharge and at the overboard discharge connection of the main condenser. The 20,000-gpmmain condenser salt water flow mixing with a maximum dilution pump discharge of 0.5 gpmprovided the required dilution factor. Relief valves are provided on the dilution pump discharge lineand on the water side of the main condenser to prevent an inadvertent overpressure of the system.8.6.3 Engine Room Ventilation SystemAll of the engine room ventilation system equipment is deactivated, disabled and performs no activefunction.The engine room ventilation arrangement consists of a supply and an exhaust system, each operatingindependently. There are three supply fans and associated distribution ductwork and three exhaustfans with similar sheet metal ductwork. The total supply system capacity is 96,000 cfm, equallydivided between the three axial supply fans. The exhaust system consists of one 40,000- and two30,500-cfm axial exhaust fans. Both supply and exhaust fan units have two-speed motors thatoperate from either a local or a remote control station. The units were located on the navigation andbridge deckhouse tops and the controllers and switches were located at the engine room landingcorridor entrance to the engine room. Emergency cutoff circuitry was provided at the CO 2 fireextinguishing system.The control room and instrument shop were provided with an air conditioning network that containsan integral circulating fan assembly. These locally mounted units were locally controlled.8.6.4 Blowdown Evaporator SystemAll of the blowdown evaporator system equipment is deactivated, disabled and performs no activefunction.The blowdown evaporator is located in the lower engine room. The evaporator consists of a singleshell, submerged tube heat exchanger that has an automatic level controller. Coil steam was suppliedfrom the 85 psig auxiliary steam reducing station or from the 115 psig main feed pump exhaustheader. Coil drains were directed to the deaerating feed heater or to the shell side of the first stagefeed heater, as applicable.Evaporator feed was taken from the surface blowdown connection on each steam generator (boiler)drum and directed through diaphragm operated valve operated from the main control room. Locallymounted, manually operated feed control valves worked in conjunction with the level-control feedvalve to admit feedwater to the shell at a rate consistent with steam generator (boiler) waterconditions. The steam vapor generated in the evaporator shell was valved into the 26-psig auxiliaryexhaust line when the heat was reclaimed through action of the deaerating feed heater.Rated blowdown of each heat exchanger was 1% of total capacity, or a total of 2650 lb/hr at 800 psigand 464°F. The evaporator output was controlled by a fixed orifice. This limited the evaporationrate to the maximum blowdown required, provided coil condition and downstream pressure wereproperly maintained for constant output conditions. Less than full blowdown was satisfactory tomaintain the steam generator (boiler) water in the desired condition. As a result, the system wasoperated with manual steam control on an intermittent basis. Evaporator brine or residue wasperiodically sampled for density and radioactivity and was discharged overboard through a sea-valveconnection.8.6.5 Fresh Water System8.6.5.1 Fresh Water ProductionRev. VI 89
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