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22 Cards in this Set
- Front
- Back
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EDWA
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east is delta train, west is alpha train
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Describe the function and purpose of the ESW
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takes suction from forebay and provides cooling water to remove heat from the ccw,EDG's,CTS heat exchangers and the CRAC chill water package and AFP Rom coolers. (provides backup suction for AFP)
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Describe the fluid flow paths within the ESW
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suction from forebay, through pumps, strainers,
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Describe the function of the ESW pumps
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two pumps per unit provides motive force for moving water through the ESW system.
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Describe the function of the esw duplex strainers
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preventative debris from pushing into the system (u1 control air supplies both units on a timer, each pump has backup bottle
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Describe the function of the esw pump discharge valves
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can isolate for maintenance. auto open when pump starts.
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Describe the function of the esw crosstie valves
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maintains opposite header in the other unit operable
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Describe the function of the cts heat exchanger inlet/outlet valves.
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outlet interlocked to open automatically on a containment spray signal w/recirc sump valves open.
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Describe the function of the emergency EDG engine cooler supply valves
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normal supply ensures adaquate cooling flow to diesel heat exchangers even if a valve or pump fails. valves open when diesel starts. alternate supply is maintained closed, opening renders diesel inoperable
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Describe the function of the esw supply valves to TDAFP and MDAFP
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break seal,close tell tale valve then valve in esw
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explain the relationship between esw and the circulating water system
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circ water intake pipes provide normal suction source in screenhouse forebay. (alt suction supply from slide gates from discharge tunnel vault)
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explain the relationship between the esw and ccw
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esw removes heat from the ccw water and pumps it to lake.
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explain the relationship between the esw and cts
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cools fluid used by cts to cool containment atmosphere during accident condition
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explain the relationship between the esw and the crac
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normal cooling supply to chiller package. also can be an alternate source of cooling. if it loses esw chiller raises pressure and trips from Freon heat.
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explain the relationship between the esw and the EDG
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esw is regulated by control valves to maintain after cooler air temp. esw is also supplied to jacketwater and lube oil coolers.(can be used as an emergency supply to jacket water system)
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explain the relationship between the esw and the auxiliary feedwater system
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last resort, one pump to one steam generator.
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explain the relationship between the esw and the esw pump room ventilation system.
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two ventilation fans in room required to be operable. takes suction from top of room and discharges through door.
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Describe how the esw system is affected by a loss/malfunction of the chemical addition.
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mussels and marine life could grow in the system resulting in potenetial blockage/degradation of heat exchangers.
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Describe how the esw system is affected by a loss/malfunction of the control air
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you have a backup air bottle to backwash strainers
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Describe how the esw system is affected by a loss/malfunction of the esw pump room ventilation.
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over heating of esw pump motors. (can raise screenhouse roll-up door to help cool)
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Describe how a failure of the esw system will affect components/systems which it supplies
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loss of train of esw supply to affected unit. D/Gs can be realigned. ccw,cts,and crac will be lost on affected header. emergency supply to MDAFP will be lost if east header is lost TDAFP lost if west header failed.
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Describe how to align essential service water to the suction of the auxiliary feedwater pumps.
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break tell tale seal, close tell tale valve, open manual isolation valve
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