AB Study Aid - SCRAM Actions Flashcards
34AB-B21-001-2 MSL Rad or Fuel Elem Failure
SCRAM Actions
IF the source of the Main Steam Line high radiation is suspected (or confirmed) to be fuel element failure and the radiation levels are sustained at greater than three times normal.
- ENTER 34AB-C71-001-2, AND SCRAM the reactor.
34AB-B21-003-2 Failure of SRVs
SCRAM Actions
IF SRV is stuck open (after attempting all other methods for closing):
ENTER 34AB-C71-001-2, AND SCRAM the reactor.
34AB-C11-001-2 Loss of CRD System
SCRAM Actions
Accumulator inoperable
a. IF Reactor pressure ≥900 psig AND CRD Charging header <940 psig AND Two or more withdrawn CR Accumulators INOP,
– w/in 20 min RESTORE charging water header press to ≥940 psig
OR
– SCRAM the reactor
b. IF Reactor pressure <900 psig AND CRD Charging header <940 psig AND One or more withdrawn CR Accumulators INOP,
THEN SCRAM the reactor
34AB-C11-004-2 Mispo Control Rods
SCRAM Actions
Scram the reactor IF:
a. Any power
i) More than 1 CR is drifting or drifted out
ii) More than 4 (≥5) CRs mispositioned >1 notch
b. Less than LPSP (<21%)
i) 1 or more CRs drifting or drifted out
34AB-C51-001 Entry into the RPI or OPRMs INOP
SCRAM Actions
While in the RPI any of the follow:
• on any APRM
OR
• 2 or More LPRMs
- ≥5% AND Increasing Peak to peak Oscillations OR - Upscale OR Downscale alarms cycling on and off <3 seconds
At ANY point on the Power vs Flow Map exceeds 10% peak to peak Oscillations
• on any APRM
OR
• 2 or More LPRMs
34AB-N21-002-2 FW/RWL Control Issues
SCRAM Actions
Scram the reactor IF unable to maintain RWL between 10”-50” during normal power operation
34AB-N61-002-2 Main Condenser Vacuum Low
SCRAM Actions
IF the decreasing trend cannot be stopped prior to any automatic action that could cause a scram or complicate continued operation – Scram the reactor
34AB-N62-001-2 Failure of Recombiner and Sustained Combustion in the Offgas System
SCRAM Actions
IF hydrogen does not reduce to <4% and Main Condenser vacuum is approaching main turbine trip – Scram reactor
34AB-N71-001-2 Circ Water Failure
SCRAM Actions
IF reactor power is >5% and circ water cannot be restored – Scram the reactor
34AB-P41-001-2 Loss of PSW
SCRAM Actions
Scram the Reactor IF (any of the following):
a. Total loss of PSW
b. Turbine Building inlet pressure <30 psig (back panel)
c. Indication of a major pipe break in turbine building
d. Either PSW division header pressure <50 psig
34AB-P42-001-2 Loss of RBCCW
SCRAM Actions
SCRAM the reactor if any of the following conditions exist:
1. IF no RBCCW pumps can be started
2. IF only one RBCCW pump is running
OR
RBCCW flow cannot be re-established
OR
RBCCW suction temperature reaches 105°F
OR
Any temperature on Recirc System reaches its alarm setpoint
34AB-P51-001-2 Loss of Air or Water Intrusion to Air
SCRAM Actions
Scram the reactor IF either of the following occurs:
a. SCRAM VLV PILOT AIR HDR PRESS HIGH/LOW (603-131)
COINCIDENT with CRD HYD TEMP HIGH (603-140)
b. Scram pilot valve air header pressure ≤50 psig as indicated on 2C11-R013
34AB-P63-001-2 Loss of TB Chillers
SCRAM Actions
IF any alarms are received, SCRAM the Reactor:
• GROUP 1 SYSTEM A or B TRIP
• STEAM TUNNEL TEMPERATURE A or B HIGH
• TURB BLDG MSL CHANNEL A/B LEAK
34AB-R22-004-2 Loss of SS 4160 Bus
SCRAM Actions
Loss of 4160 C
a. Reactor SCRAM may occur depending on Power Level
b. Loss of “C” Condensate and CBP
c. Loss of “B” RFPT due to loss of AC oil pumps
d. Loss of Cooling Pumps on BOTH ASDs (15min)
e. SCRAM the Reactor
Loss of 4160 D
f. Reactor scram could occur depending on Power Level
g. Loss of Condensate and CBPs “A” and “B”
h. SCRAM the Reactor
34AB-R25-001-2 Loss of Vital AC
SCRAM Actions
IF Vital AC power cannot be restored, then evaluate need to SCRAM the reactor AND SCRAM
Lowering RWL and Mn Cond Vacuum EVALUATE & SCRAM
34AB-T23-003-2 Torus Temp Above 95F
SCRAM Actions
> 110°F – Enter SCRAM procedure and SCRAM the reactor – verify temperatures ≤120°F once per 30 minutes
34AB-X43-001-2 Fire Procedure
SCRAM Actions
SCRAM the reactor for a fire located in
a. Turbine Lube Oil System
b. EHC System
c. Hydrogen Seal Oil System
If fire is located in the following areas AND directed by SS SCRAM:
a. Oil Storage Tank Room
b. Oil Conditioner Room
c. Water Analysis Room
d. CB 112 Working Floor, Corridor, and Annunciator Cabinet
IF directed by Shift Supervisor – SCRAM the reactor
34AB-Y22-004-0 Intruder Based Security Threat
SCRAM Actions
IF threat is valid and imminent:
Scram both units allow approximately 30 seconds between unit trips.
“CREDIBLE IMMINENT SECURITY THREAT” means within 30 minutes.
Credible notification/verification would normally come from the NRC through the ENS phone but also could come from the FBI.
34AB-Y22-005-0 Airborne Threat
SCRAM Actions
IF Imminent, shutdown both units with an approximate 30 second delay
between units. (Implied SCRAM since Probable Threat requires a Fast Reactor Shutdown)
Verification is received from the NRC that the site is in the flight path of a track of interest (TOI) with estimated time of arrival of 5 minutes or less.
ARP P650-206 Generator Protection CKT Energized
SCRAM Actions
IF a Main Turbine Bypass Valve begins OPENING during performance of this procedure, enter 34AB-C71-001-2, Scram Procedure, AND SCRAM the Reactor.
IF Recirc Flow is LOWERED to the point where rod insertion is required for further power reduction,
AND
this alarm has NOT cleared, THEN enter 34AB-C71-001-2, Scram Procedure, AND SCRAM the Reactor
Stator Cooling:
• 35(25.6) psig
• 81 C
• 405 gpm
ARP P650-220(110) Hotwell Level Abnormal
SCRAM Actions
Alarm Setpoint 20” Low and 70” high
IF hotwell level reaches zero inches, TRIP operating condensate pumps, condensate booster pumps, AND RFPTs. IF the condensate system is required for RPV level control, enter 34AB-C71-001-1, Scram Procedure, AND SCRAM the reactor.
ARP P650-107(128) EHC Reservoir Level Hi/Lo
SCRAM Actions
Alarm Setpoint HI +4/ LO -4inches from normal
IF the fluid level is LOW AND the control valves begin to hunt, perform the following:
• IF > 27.6% power, enter 34AB-C71-001-1, Scram Procedure, AND SCRAM the reactor
ARP P650-132(129) Brg Header Oil Press Low
SCRAM Actions
Alarm Setpoint 26# and falling
IF the bearing oil supply line is ruptured, OR oil pressure cannot be restored:
• IF reactor power is > 27.6% of rated, enter 34AB-C71-001-1, Scram Procedure, AND SCRAM the reactor.
ARP P650-106(150) EHC Fluid Pressure Low
SCRAM Actions
Alarm Setpoint 1300#
IF turbine load is < 27.6% of rated AND no scram occurs, PERFORM the following:
• IF reactor pressure cannot be controlled, enter 34AB-C71-001-1, AND SCRAM the reactor.
ARP P603-123(116) Reactor Level Control Valve Lockup
SCRAM Actions
IF Reactor level CANNOT be controlled,
enter 34AB-C71-001-2, Scram Procedure and SCRAM the Reactor.
