Plant tripped. SI/CIA actuated due to steamline break outside containment.
What describes how the reactor plant chilled water system is affected?
RPCCW supplies cooling to a few CDS loads inside containment. The operating CDS chillers stop
What is the purpose of maintaining a minimum flow through chilled water recirculation control valve?
ensure a minimum flow through the chillers during low load conditions
What is the programmed time delay between successive CDS compressor starts?
30 mins
What system acts as the heat sink for the reactor plant chilled water system?
RPCCW
What is not a function of the CDS system?
cooling for the reactor plant sample panel sample coolers
One of the normal loads on the reactor plant chilled water system is:
CAR cooling coils
One of the purposes of the CDS system is to suply chilled water to:
RWST coolers
What is the function of the pre-rotation vanes?
to compensate for variations in load
What is the function of the 25 PSID oil pressure switch when the CDS chiller start pushbutton is pushed?
prevents the start of the chiller if not satisfies after 30 seconds
What is the power supply for 3CDS-CHL1C?
4160 V bus 34A
Increasing recirculation flow through chiller recirc flow control valve indicates which of the following?
decreasing load on CDS system
Why must the CDS chiller lube oil heater be energized for 12 hours, or the compressor oil changed, prior to starting the unit?
prevents lube oil foaming upon compressor start
Describe why the CDS surge tank is pressurized with nitrogen to 7-11 psig
provide NPSH to pumps and provide corrosion control
Given the following:
PEO finds the “C” CDS chiller tripped
Switchgear 86E relay not tripped
Chiller “cycling/flow interlock” alarm at the local panel is present
What signals causes the chiller to trip?
RPCCW condenser water flow low
The limit on CDS chilled water circulating pump is:
two starts in one hour if the motor comes to rest between starts
Makeup water for the CDS system comes from:
RPCCW
During CDS chiller startups and shutdowns, when will the lube oil pump automatically start and stop?
starts when the chiller control switch is taken to “START” and stops 45 seconds after the chiller stops
