Steam Dumps Flashcards
What temperature is T No Load?
547*F
What is Lo-Lo Tave?
541*F
How many groups of dumps will actuate on Turbine Trip?
2 groups, 6 valves
What is C-7A?
Arming Signal
10% Step Load Change
5% / minute change
What is C-7B?
Arming Signal
30% Step Load Change
What is C-8?
Turbine Trip Arming Signal
4/4 Main Turbine Stop Valves Closed
OR
2/3 oil Pressure switches below 800#
What is C-9?
Blocking Signal
- CW Pump Breaker Closed
- CRID 2 Energized
- 3/3 Condenser Vacuums > 20.6” Hg
What is P-12?
Blocking Signal
2/4 Tavg < 541*F
Which CRID has no Steam Dump Loads?
CRID 3
What is the input to Tref?
MPC-253
What is the input to the arming signals?
MPC-254
When do you get all 3 groups of steam dumps?
30% load rejection
What groups are available on a 10% Load Rejection?
Groups 1 and 2
What steam dump mode must you be in to cool down below 541*F?
Steam Pressure mode if P-12 Bypass
What does P-12 prevent?
Excess Cool down
The steam dump system is designed to accept steam flow equivalent to _____% of full power
40%
How low can you cool down on a normal Turbine Trip?
T no load
547*F
If a Auctioneered High T avg instrument fails high, and you get a turbine trip, how low will you cool down?
541*F
P-12 stops you
Are steam dumps safety related?
NO
What are the turbine trip and load rejection controllers based on?
Auctioneered High Tave
How many groups of steam dumps are available in Steam pressure mode?
Group 1 And 2 (if above 541*F)
You can Bypass P-12 to get 1 group of dumps to cool down below 541*F
You must JUMPER to get a second group
MPC-253 fails high. Half hour later, Rx trip and no operator action. A few mins following the trip, what will RCS Tavg be?
547*F
What is the input to the Steam Dump Turbine Trip Controller?
Auctioneered High Tave
What is the temperature input to the Load Rejection Controller?
MPC-253 (Tref)
What is the input for Steam Dump Steam Pressure Controller?
UPC-101
