Walkthrough Study Guide Flashcards
Condensate pump trip?
-30in in hotwell
-Low flow 3600gpm after 45sec
-B pump trips if both suction valves go closed
Condensate power supplies?
Pump A NBN-S01
PumpB NBN-S01
Pump C NBN-S02
Condensate service header loads?
-Heater drain pumps
-CD Pumps seal water
-AR pump seals
What cools condenser pump lube oil ?
Turbine cooling water
Which hotwells do the condensate pumps take suction from ?
A pump- 2A,2B,&2C
B pump-1A,1B,1C
What’re the major loads for condensate main header ?
-condensate service header
-Heater drain pump seals
-Feedwater pump seal water
-Blowdown heat exchanger
-Condensate cross-tie header
What condenser vacuum will turbine & MFWP trip at ?
-Turbine 7.5”HGA
-MFWP 13.5”HGA
What will happen to MFWP when condensate pumps trip ?
-One condensate pump will trip one MFWP after 10 seconds
-2 condensate pumps will trip both MFWP pumps
-Reactor will trip on low SG level
What is long path Recirc ?
Normal flow except MFWP are bypassed
How does mini flow Recirc valve operate on loss of air ? During MFWP trip on low lube oil pressure? Loss of NN power?
Loss of air- will fail valve open
MFWP pump trip on low lube oil pressure - will close mini flow to prevent pump from freewheeling
Loss of Power-
MFWPT pump trip setpoints ?
-Overspeed-6350rpm
-Feed water pump suction low 245psig
‘A’ pump-15 seconds
‘B’ pump- 10 seconds
-MFWP high discharge @1780psig
-Pump bearing 4psig
-Turbine bearing 4psig
-13.5”HGA
-Thrust beating wear high 40psig
Where is the steam supplied from for MFWPT ?
-Low pressure steam supplied from MSR ‘D’
-High Pressure steam supplied from main steam
-Aux steam used for overspeed testing
Where does MFWPT exhaust go ?
A Main condenser
What is emergency Governor overspeed ? (Mechanical overspeed)
Will mechanical trip turbine if normal electronic overspeed doesn’t work at 110% speed
Condensate transfer system loads?
-Ew surge tanks
-EC surge tank
-SFP
-DG surge tanks
What’s capacity of CST & how much is dedicated to Aux Feed ?
-550,000 gallons
-300,000 gallons dedicated to Aux Feedwater
Where is primary flow path from CST to FLEX SG makeup pumps ?
Use CST drain line that is locked closed in drain pit
What auto starts CST pumps?
-SIAS
-LOP
-CREFAS
-CRVIAS
What is alternate FLEX supply from CST to SG Makeup Pumps ?
From CST via supply line to ‘B’ Aux Feedwater Pump
