The steam dump system is designed to accommodate a load rejection without a reactor trip to a max of __ % rated thermal power.
40
Which is the most severe load rejection the plant can withstand without either a Rx trip or atmospheric steam dump lifting?
50% step load rejection
The reactor trips from 100% power.
The “A” reactor trip breaker fails to open.
What will be the final RCS Tavg?
557 F
The lo-lo Tave block signal can be bypass for ____ steam dump valves to allow performing a controlled plant cooldown.
bank 1
Which of the following must exist to “arm” steam dumps?
condenser vacuum must be available
The steam pressure mode of the turbine bypass valve control system is used to control RCS temp by:
modulating steam dumps in response to steam header pressure error
The bank 1 “cooldown” steam dump valves consist of ___ and are arranged to direct steam into _____.
3MSS-PV47A/B/C; condensers 1A, 1B, 1C
Steam dumps in Steam Pressure Mode
Pressure controller in auto
All circ pumps running
What condition will directly close the condenser steam dumps valves and then PREVENT from auto opening?
main steam header pressure as sensed by PT-507 fails low
Plant tripped from 100% power.
What condition would prevent the condenser dumps from being able to control RCS temp?
MSIV closed
