Which of the following describes how makeup water is supplied to the PRT?
water is supplied from PGS tanks via the PGS pumps
What describes the reason for maintaining a nitrogen blanket on the PRT?
to reduce the potential for an explosive mixture of hydrogen and oxygen
What parameter will cause the PRT vent valve to CLOSE automatically?
PRT high pressure only
Which paths can all be aligned to the PRT?
reactor vessel head vent, pressurizer PORVs, pressurizer safeties
A precaution in OP 3301A requires the operator to monitor the PRT during filling operations and maintain PRT less than 64.7 psia.
What is the basis for this limit?
prevent distortion or damage to the rupture disks
The pressurizer level control system is designed to:
control level based on the Tavg program from 0%-100% power in order to maintain a constant RCS mass
The spray valve bypass valves are throttled slightly open to provide bypass flow which prevents ________ and enhances ________.
spray nozzle thermal shock, boron equalization
The purpose of the PRT system is to collect, cool, and direct for processing _______.
relief and safety valve discharges inside of the containment building
How does PRT drains outlet valve respond to a changing PRT level?
auto close on PRT low level, to prevent lowering PRT level below min level required to quench and cool influent from the pressurizer
Which describes how activation of Block/Auto affects the operation of the PRT drains outlet valve?
allows AV8031 to be opened with PRT level below the high level setpoint
Why does the discharge from the PORV and pressurizer safety valves enter the PRT through a submerged sparger pipe?
effectively quench and cool the influent
The PRT level is at 65% and pressure at 20 psia. What components will be in the OPEN position?
reactor plant gaseous drains containment isolation (outside)
PRT vent valve
RO is starting the PRT drains transfer pump.
Why is the RO required to place and HOLD the pump control switch in “Start” until after the pump starts?
placing the switch in “start” causes the inside containment isolation valve to stroke open prior to the pump starting
What transients is the pressurizer pressure and level control system designed to accommodate without a reactor trip?
instantaneous load changes of 10% WITH auto rod control
Which of the following correctly describes the function of the pressurizer spray valve bypass flow?
minimize thermal shock to the spray nozzle, and maintain uniform water chemistry and temp in the pressurizer
What is the primary function of the pressurizer control group heater?
correct for small pressure variations due to ambient heat losses and continuous bypass spray flow
the PORVs will open in response to what signals?
2 of 4 pressurizer pressure channels > 2350 psia
3RCSPCV455A is leaking by and will not reseat
Block valve 3RCSMV8000A will not close
What is potentially a consequence of this?
the contents of the PRT will be released to the containment atmosphere when the PRT rupture disk fails, raising CTMT temp and pressure
How is thermal shock of the pressurizer spray line minimized when aux spray is initiated?
charging flow to the aux spray line is preheated in the regenerative HX
At what pressure will the PRT rupture disks break?
86 to 100 psig
