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SECTION 2.0:PROJECT DESCRIPTION <br /> purposes. Since they will be redundant,no single processor failure can cause or prevent a <br /> unit trip. <br /> The DCS will interface with the control systems furnished by the combustion turbine,steam <br /> turbine,HRSG, and fuel gas compressors suppliers to provide remote control capabilities,as <br /> well as data acquisition, annunciation,and historical storage of turbine and generator <br /> operating information. <br /> The system will be designed with enough redundancy to preclude a single device failure <br /> from significantly affecting overall plant control and operation. Consideration will be given <br /> to the action performed by the control and safety devices in the event of control circuit <br /> failure. Controls and controlled devices will move to the safest operating condition upon <br /> failure. <br /> Plant operation will be controlled from the operator panel in the control room at the STIG <br /> plant.The operator panel will consist of individual CRT/keyboard consoles and one <br /> engineering workstation. Each CRT/keyboard console will be an independent electronic <br /> package so that failure of a single package will not disable more than one CRT/keyboard. <br /> An engineering workstation will allow the control system operator interface to be revised by <br /> authorized personnel. <br /> 2.5.2.6 Boiler Feedwater System <br /> The boiler feedwater system will transfer feedwater from the LP steam drum to the HP and <br /> IP sections of the HRSG. The system will consist of two 100-percent-capacity pumps for <br /> supplying the HRSG. Each pump will be multistage,horizontal,and motor-driven and will <br /> include regulating control valves,minimum flow recirculation control, and other associated <br /> pipes and valves. LP system will receive feedwater directly from the LP economizer using <br /> the pressure supplied by the condensate pumps. <br /> 2.5.2.7 Condensate System <br /> The condensate system will provide a flow path from the condenser hotwell to the HRSG LP <br /> economizers. The condensate system will include three,50-percent-capacity,multistage, <br /> vertical,motor-driven condensate pumps. <br /> 2.5.2.8 Demineralized Water System <br /> The demineralized water system will be used for cycle makeup, CTG wash water and <br /> chemical cleaning operations. It will include a two-pass reverse osmosis system followed by <br /> an electro-deionization system which feeds a demineralized water storage tank.The product <br /> water from the first pass RO will be used for CTG evaporative cooler makeup. <br /> 2.5.2.9 Power Cycle Makeup and Storage <br /> The power cycle makeup and storage subsystem provides demineralized water storage and <br /> pumping capabilities to supply high-purity water for system cycle makeup,water wash, <br /> and chemical cleaning operations. The major components of the system are two full- <br /> capacity,horizontal,centrifugal,cycle makeup water pumps. <br /> SACI371322I082340003(LEC_2.0_PROJECT_DESC.DOC) 2-39 <br />