ACADs (08-006) Covered Keywords Components, functions, operation, Auxiliary feedwater, Startup, hot...
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Transcript of ACADs (08-006) Covered Keywords Components, functions, operation, Auxiliary feedwater, Startup, hot...
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ACADs (08-006) Covered
KeywordsComponents, functions, operation, Auxiliary feedwater, Startup, hot standby, plant cooldown, emergency.
Description
Supporting Material
4.2.7.1 5.2.2.1 5.2.2.10
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Auxiliary Feedwater System
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OBJECTIVES1. State the purpose of the Auxiliary Feedwater System.
2. List the major components in the AFW System and state the function of each.
3. Describe the operation of the AFW System during: a. Startup b. Hot standby c. Plant cooldown d. Emergency
4. Describe the normal line-up for the AFW System.
5. List the signals which initiate the automatic starting of the motor-driven and turbine-driven AFW pumps.
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Auxiliary Feedwater System
Purpose:
Serves as a backup system for feeding steam generators whenever RCS temperature is above 350F and main feed system is not available.
Level must be maintained in SG even during emergency since SG is the reactor's heat sink. 5
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Components:
• Two Motor Driven Pumps
• One Steam Turbine Driven Pump
• Two Condensate Storage Tanks
• Associated Piping, Valves, & Controls
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From S/G #1
From S/G #2
To S/G #4
To S/G #1
To S/G #2
To S/G #3
CST #1
CST #2
Pump 001
Pump 002
Pump 003
Auxiliary Feedwater System
Motor Driven AFW Pump
Motor Driven AFW Pump
Turbine Driven AFW Pump
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MDAFW Pump • Each pump is capable of 100% capacity.
• 630 gpm (including recirculation flow) @1517 psi
– Takes suction from one CST– Motors are air cooled
• Each pump feeds 2 SGs
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MDAFW Pump • The pumps may be operated manually
or will start automatically upon detected loss of heat sink and loss of power events
• Automatically started by1) Low water level in any one SG (2 of 3
coincidence)
2) Both MFPs tripped
3) SI (Safety Injection)
4) Blackout signal
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Motor Driven AFW Pump
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Motor Driven AFW Pump Suction Piping12
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TDAFW Pump• Power supply is Main Steam pressure
upstream of MSIV’s (Loops 1 & 2)• Exhaust to atmosphere• Apply feedwater to SGs during
emergencies when the main feedwater and motor-driven pumps are inoperable
• Capacity - 1175 gpm (almost twice capacity of MDAFW pump)
• Aligned to all four SGs
• Auto started by 2 SGs at low level setpoint (2 of 3 coinc per SG)
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Turbine Driven AFW Pump14
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Condensate Storage Tanks(CST)
– Vertical, cylindrical tanks of reinforced concrete with a stainless steel liner
– CST #1 normally lined up to provide water to the AFW system (Manual valves)
– CST #2 provides an alternate water source
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CST Capacity
– Capacity - 480,000 gallons each
– All non-safety system consuming CST water take a suction via a standpipe with nozzle level that ensures the minimum water level is maintained available
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CST #1CST #2
VacuumDegasifier
System
OverflowBasin
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AFW Actuation Signal
• Automatic features - AFW is aligned to be placed in service automatically in the event of an emergency• Auxiliary feedwater actuation signal (Motor
Driven)• SI signal (associated train)
• Loss of offsite power (blackout) associated train
• Lo-Lo Level in SG - 38% - 2/4 on 1/4 SG
• Both SGFPs trip (2/2)
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TDAFW Actuation Signal
– Actuating signals• Lo-Lo SG water level - 38% - 2/4 on 2/4 steam
generators• Loss of offsite power (black out on either train)
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Objectives Review1. State the purpose of the Auxiliary Feedwater System.
2. List the major components in the AFW System and state the function of each.
3. Describe the operation of the AFW System during: a. Startup b. Hot standby c. Plant cooldown d. Emergency
4. Describe the normal line-up for the AFW System.
5. List the signals which initiate the automatic starting of the motor-driven and turbine-driven AFW pumps.
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