Reactor Trips Flashcards
SR High Flux Trip
Coincidnet, Setpoint, block?
1/2 SR @ 10^5 CPS
Can be blocked with P-6
Autoblocked with P-10
Intermediate High Flux Trip
Coincident, setpoint, block?
1/2 IR @ 25% CE (curent equivalent)
Can be manually blocked when greater than P-10
Power Range High Flux Low set point Trip
Coincident, setpoint, block?
2/4 PR @ 24%
Can be manually blocked when greater than P-10
Power Range High Flux High set point Trip
Coincident, setpiont, block?
2/4 PR @ 108%
Cannot be blocked
High Pressure PZR trip
Coincident, setpoint, block?
2/3 Pressure xmitters @ 2376psig
cannot be blocked
Low Pressure PZR trip
Coincident, setpoint, block?
2/3 Pressure xmitters @ 1844
Enable/Disable with P-7
High PZR water Level
Coinicdent, setpoint, block?
2/3 Level xmitters @ 91%
Enable/Disable with P-7
Low Reactor Coolant Flow Trip
Coincident, setpoint, block?
Above P-8 (40%) 2/3 flow xmitters in 1/3 loops @ 94.68% flow
Above P-7 (10%) 2/3 flow xmitters in 2/3 loops @ 94.68% flow
Auto blocks below P-7
RCP Breaker Open Trip
Coincident, setpoint, block?
Above P-8 1/3 breakers open
Above P-7 2/3 breakers open
Enable/disabled with P-7
RCP Bus UV
Coincident, setpoint, block?
2/3 UV on RCP breakers @ 3120V
Enable/Disable with P-7
RCP Bus UF
coincident, setpoint, block?
2/3 RCP busses @ 58.2Hz
Enable/Disable with P-7
(Trips open all RCP breakers, Indirect Reactor Trip)
S/G Low-Low water level
coincident, setpoint
2/3 NR level xmitters on 1/3 S/G @ 16%
Turbine Trip
coincident, setpoint, block?
2/3 Low EH oil pressure @ 800psig
OR
2/2 Stop Valves Close
Enable/Disable with P-8
SI signals
1.Manual 1/2 pushbuttons
2.Low PZR pressure 2/3 @1715psig
3. Hi Steam Line D/P 2/3 @ on 1/3 lines @100psig
4. Hi CV Pressure 2/3 on 2/2 groups @ 4psig
5. Hi-Hi CV pressure 2/3 on 2/2 groups @ 10psig
6. Hi steam line flow with Low Tavg or Low Steam Line Pressure
OT▲T
Variable,2/3 Loop ▲T at setpoint
2% below setpoint causes runback
OP▲T
variable, 2/3 Loops at ▲T setpoint
1% below setpoint causes runback
What feeds OT▲T? And what does it protect from?
Tavg/Press/▲I
Protects from DNB
What feeds OP▲T?
Tavg/Tavgsec/▲I
Protects from over power (KW/ft)
If Tavg goes up what does it do to the set point of OT▲T?
Setpoint lowers
If Pressure goes up what does it do to the set point OT▲T?
Setpoint rises
What happens to the setpoint of OP▲T if Tavg goes up or down?
- Tavg goes up, setpoint lowers
- Tavg goes down, setpoint doesnt change
Runback is how long and then waits how long? what power change?
1.5s runback, wait 28.5s
5% power drop
RTBs have:
UV coils and Shunt Trip coils
RTB bypasses have:
Only UV coils
