Reactor Trips Flashcards
(19 cards)
Source Range Hi Flux Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Source Range Hi Flux Rx Trip
→ protects against startup accident
→ Setpoint: ≥10^5 cps
→ Coincidence: 1/2 SR Detectors
Notes:
→Can be manually blocked (2/2 switches) when P-6 is met
→Auto blocked when P-10 is met
→When P-6 no longer met, trip is automatically reinstated
→Can be manually unblocked when P-10 no longer met
Intermediate Range Hi Flux Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Intermediate Range Hi Flux Rx Trip
→ protects against startup accident
→ Setpoint: IR current ≈ 25% PR
→ Coincidence: 1/2 IR Detectors
Notes:
→Can be blocked manually when P-10 is met
→When P-10 no longer met, trip is automatically reinstated
Power Range Hi Flux “Low Setpoint” Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Power Range Hi Flux “Low Setpoint” Rx Trip
→ protects against overpower condition, uncontrolled RCCA bank withdrawal
→ Setpoint: ≥25%
→Coincidence: 2/4 PR detectors (alarm on 1/4)
Notes:
→Can be blocked manually when P-10 is met
→When P-10 no longer met, trip is automatically reinstated
Power Range Hi Flux “Hi Setpoint” Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Power Range Hi Flux “Hi Setpoint” Rx Trip
→ protects against DNB (also excessive kW/ft)
→ Setpoint: 109%
→ Coincidence: 2/4 PR Detectors (alarm on 1/4)
Notes:
→cannot be blocked
Power Range Hi Positive Rate Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Power Range Hi Positive Rate Rx Trip
→ protects against rod ejection
→ Setpoint: +5% w/time constant of 2 seconds
→ Coincidence: 2/4 Channels (alarm on 1/4)
Notes:
→Must be manually reset at NIS cabinets
→Setpoint is variable based on rate of power increase (i.e. 2.5 % in 1 second will actuate trip, 5% increase in 2 seconds will actuate trip, 10% increase actuates immediately)
“Five-two, peeeeewww!!!”
Manual Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Manual Rx Trip
→protects against - N/A
→Setpoint: N/A
→ Coincidence: 1/2 handswitches
Notes:
→trip switches located on CB-07 and CB-10
→switch on CB-07 can be used to close Trip breakers
RCP Undervoltage Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
RCP Undervoltage Rx Trip
→ protects against DNB, anticipates loss of coolant flow
→ Setpoint: 4830 volts
→ Coincidence: 2/4 RCPs
Notes:
→P-7 must be met in order to trip
→0.5 sec time delay
RCP Underfrequency Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
RCP Underfrequency Rx Trip
→ protects against DNB, anticipates loss of coolant flow
→ Setpoint: 57.2 Hz
→ Coincidence: 2/4 RCPs
Notes:
→P-7 must be met in order to trip
→Also trips open all RCP breakers to extend coast down time
→0.1 sec time delay
Low Loop Flow Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Low Loop Flow Rx Trip
→ protects against DNB
→ Setpoint: ≤90% flow
→ Coincidence: 2/3 on 1 loop if P-8 (> 48%) is met OR 2/3 on 2 loops if P-7 is met (>10%) but not P-8 (>48%)
Notes:
→P-7 must be met in order to trip
→Setpoint dependent upon Rx power, between P-7 (10%) and P-8 (48%) then requires 2 loops to be < 90% flow. If P-8 met (>48%) then only requires 1 loop to be < 90% flow
OT N-16 Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
OTN-16 Rx Trip
→ protects against DNB
→ Setpoint: 115% ± penalties
→ Coincidence: 2/4 channels
Notes:
→If RCS press increases then setpoint increases and vice versa
→If RCS temp increases then Setpoint decreases and vice versa
→0.7 sec time delay
OP N-16 Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
OPN-16 Rx Trip
→ protects against excessive kW/ft, mitigates consequences of steamline break
→ Setpoint: 112%
→ Coincidence: 2/4 channels
Notes:
→Backup to PR Hi Flux (Hi Setpoint) trip
→Not sensitive to Rx vessel down comer temp changes as is PR NIs
PZR Low Pressure Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
PZR Low Pressure Rx Trip
→ protects against DNB
→ Setpoint: 1880 psig, rate compensated
→ Coincidence: 2/4 channels
Notes:
→P-7 must be met in order to trip
→Trip is automatically bypassed when P-7 no longer met
→The faster pressure decreases, the higher above setpoint the Rx will trip
PZR Hi Pressure Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
PZR Hi Pressure Rx Trip
→ protects against RCS overpressure
→ Setpoint: 2385 psig
→ Coincidence: 2/4 channels
Notes:
→N/A
PZR Hi Level Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
PZR Hi Level Rx Trip
→ backup to high pressure trip; prevents sending water thru safeties
→ Setpoint: 92%
→ Coincidence: 2/3 channels
Notes:
→P-7 must be met in order to trip
→Trip is automatically bypassed when P-7 no longer met
S/G Lo-Lo Level Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
SG Lo-Lo Level Rx Trip
→ protects against loss of heat sink
→ Setpoint: U1 38%, U2 35.4%
→ Coincidence: 2/4 channels on 1 S/G
Notes:
→2/4 channels on 1 SG will start MDAFWPs
→2/4 channels on 2 SGs will start TDAFWP
→1.0 sec time delay to allow for transients
Turbine Trip Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Turbine Trip Rx Trip
→ limits transients on Rx, anticipatory trip
→ Setpoint: ≤59 psig trip oil pressure OR all stop valves closed
→ Coincidence: 2/3 pressure switches OR 4/4 stop valves closed
Notes:
→Trip is not active until P-9 is met
→Trip is automatically bypassed when P-9 no longer met
Safety Injection Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
Safety Injection Rx Trip
→ limits consequences of an accident
→ Setpoint: any SI signal causes Rx trip
→ Coincidence: N/A
Notes:
→Signal initiated thru SSPS via slave relays
→if uPC1 lost, Train A will not actuate
→if uPC2 lost, Train B will not actuate
SSPS General Warning Rx Trip
→What does it protect against?
→Setpoint?
→Coincidence?
→Notes
SSPS General Warning Rx Trip
→ protects against anticipatory loss of Rx protection
→ Setpoint: General Warning Alarm
→ Coincidence: 2/2 trains of SSPS
Notes:
→General warning informs operator that SSPS is in a degraded condition
Cristian’s mnemonic for the list of reactor trips
“Sip Mr. Loop’s Teas, Sport”
→each P has three Ps in a row
→roll your Rs (two Rs in a row)
S - Source Range Hi Flux
I - Intermediate Range Hi Flux
P - Power Range Hi Flux “Low Setpoint
P - Power Range Hi Flux “Hi Setpoint”
P - Power Range Hi Positive Rate
M - Manual
R - RCP Undervoltage
R - RCP Underfrequency
L - Low Loop Flow
O - OT N-16
O - OP N-16
P - PZR Low Pressure
P - PZR Hi Pressure
P - PZR Hi Level
‘S - S/G Lo-Lo Level
T - Turbine Trip
S - Safety Injection
S - SSPS General Warning
