N43 - Primary Water Flashcards
Why should a leakage pump always be running?
to maintain level in the standpipe
What happens if no leakage pumps are running?
primary water will overflow to radwaste
what will cause standby leakage water to auto start?
low discharge on running pump
what’s the purpose of the hydrogen blanket in the primary water tank?
limit air into the system to prevent corrosion
when will TG standstill pump auto-start and stop?
Switch in auto: starts at 62 psig primary water system pressure after turbine trip.
Stops at 62 psig on turbine roll up
(equivalent to 800 rpm)
How long will TG standstill pump run in test?
10 seconds
What are the power supplies to the leakage water pumps?
A - 13B22
B - 16B42
At what level does the leakage water overflow to radwaste?
19 feet
What level is the leakage water standpipe maintained at?
10 feet
What temp should primary water be entering ion exchanger and why?
50 deg C (122 F) to prevent damaging the resin and ions being released instead of captured
what’s the purpose of Primary water?
Cools the main generator stator, rotor, and 3 busing circuits
What temp is the primary water maintained at compared to hydrogen? Why?
2 deg F higher than hydrogen gas temp to avoid gas dew point condensation
What cools the primary water coolers
TBCW
When will high conductivity alarm come in for each location?
Deionizer high 2.2 mmho/cm2
main flow 2.2 mmho/cm2
Leakage water 2.5 mmho/cm2
What is the power supply of the main primary water supply pump?
Shaft driven off turbine
