State the purpose of the Condensate System Primary Functions
1. Transfers condensate from the HW to the S/G for reuse.
2. Preheats the condensate for greater overall plant efficiency
3. Provides suction requirments for MFPs.
4. Purifies condensate prior to startup.
State the purpose of the Condensate System Secondary Functions
1. Make up to stat or cooling water system (electrical generator)
2. Provides seal injection to variuos condenser feedwater pumps.
3. Makeup to Gland seal water tanks
4. Flushing and regen water to Demin. Beds
5. Exhausted hood spray
6. Makeup to Aux. Boiler
State the purpose and the capacity of the condensate storage tank including the Tech Spec minimum requirements.
make up to the condensate system on the loss of water inventory.
Supplies Aux feedwater
Initial filling and venting of the condensate system (secondary system and S/G)
Tank Capacity - 385,000
-has the capability to pump water from one tank to the other but is rarely used.
Tech Spec equal to or lesser to 240,000 gal to make sure there is enough water for the aux feedwater
Describe the hotwells as to location, design, and level control.
Located in the bottom of the condenser
Main Condenser - excepts exhaust from the Low Pressure Turbines and the steamdumps
Condenser Vacuum- lcv 2-3 dumpback if lvl is too high. If the lvl gets to low lcv 2-9 will open allowing water to flow in via vacuum drag. Must be mantained in range to provide enough suction head for the hotwell pumps.
Describe the Hotwell Pumps as to type, capacity, and power supply.
6.9KV unit boards or 480V
6700gm at 600ft total discharge head
centrifugal pumps, vertically mounted, 4 stage
mechanical seals - keeps water from leaking from the pump cooling supplied by gland seal water system
Identify the logic required to be met before a hotwell pump can be started.
FCV 205 and FCV 210 or FCV 211 and FCV 216 must be open.
*one set of inlet valves and outlet valves must be open to establish flow
manual start only
loss of flowpath
State the purpose of the condensate Demineralizers
Identify the conditions which will require the condensate demineralizers bypass valve FCV-14-3 to be opened
High pressure differential *(60PSID)
Identify the two purposes for flow transmitter FE-2-35 and explain how its input signal is measured.
flow transmitter 2-35 (FE2-35) measured by the difference in pressure of the upstream & downstream tapoffs
1.Used to control FCV 2-35 (condensate recirc. valve.) to ensure minimum of 5500gpm
Ensure there is flow through GSC for HX and MFPT
Keeps demin beds compacted
2. to clean up the condensate by removing oxygen
Describe the condensate demineralizer booster pumps as to type, capacity, and power supply.
3 ConDI Booster Pumps
Horizontal, single stage, centrifigul, 6700 gal TDH 150ft.
Located in the basement of the turbine building
480V motors, 2 pumps are placed in service on startup. The 3rd pump is started at >70% power
Identify the logic required to be met before a condensate demineralizer booster pump can be started.
1.) Suction valve must be fully opened
2.)The suction pressure must be greater than 20 psig
3.)No FW isolation signal
4.)Must have addiqute Bus E available
5.)Local push button must be reset
1.)Low suction pressure < 20psig for 3 seconds
3.)Main turbine trip
Explain the purpose of the gland seal steam condenser.
Condense the steam leak off from the MT and MFPT seals and exhaust non-condensible gases to the atmosphere
1 fan is running to keep at 22"-25" water vacuum. 2nd fan is on standby for 17" water vacuum.
Explain how flow through the gland steam condenser is controlled.
FCV 2-260 stays completely closed until 30 lbs of water pressure is reached. Then the valve opens to divert flow so that flow doesnt exceed 3,000gpm
State the purpose of the steam generator blowdown heat exchangers
removes heat from the steam generator blowdown so that it can be injected upstream of the ConDI.
Explain how flow is ensured through the 2nd stage steam generator blowdown heat exchanger
through a flow control orifice
State the purpose of the main feed pump turbine condensers
to condense the MFPT exhaust steam
Vacuum is maintained by a 4" line connected to the condenser (connected to the main condenser)
Identify the conditions which will cause the main feed pump turbine condenser valves to automatically close
If both pumps are running and one trips off the associated inlet/outlet valves will close while the 2nd remains open. If both trip at the same time then both sets of valves will stay open for both pumps.
If only one pump is running the last valve to trip will remain open.