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36 Cards in this Set
- Front
- Back
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R P S SCRAM
Turbine Stop Valve Closure |
< 95% Open
Automaticly Bypassed < 29.5% Rated Thermal Power (Sensed at Main Turbine First Stage Inlet Pressure < 188.8 psig Unit 1, < 167 psig Unit 2) Channel Sensor Assignments (3/4 Main Steamlines Isolated) Channel A1 - MSV 3 and 4 Channel A2 - MSV 1 and 2 Channel B1 - MSV 1 and 3 Channel B1 - MSV 2 and 4 |
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R P S SCRAM
Turbine Control Valve Fast Closure |
< 500 psig RETS Pressure at Valve Disc Dump Cavity
Automatically Bypassed < 29.5% Rated Thermal Power (Sensed at Main Turbine First Stage Inlet Pressure < 188.8 psig Unit 1, < 167 psig Unit 2) Channel Sensor Assignments (1/2/2 Logic) TCV 1 - RPS Channel (Unit 1- B1)/(Unit 2 - B1) TCV 2 - RPS Channel (Unit 1- A1)/(Unit 2 - B2) TCV 3 - RPS Channel (Unit 1- B2)/(Unit 2 - A1) TCV 4 - RPS Channel (Unit 1- A2)/(Unit 2 - A2) |
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R P S SCRAM
SCRAM Discharge Volume High Level |
> 25.45 gal (U1) IS (62%)
> 25.58 gal (U2) IS (62%) Bypassed Rx Mode Switch in "SHUTDOWN" or "REFUEL" and SDV Keylock switch in "BYPASS" Basis - to prevent hydraulic lock of CRD on a SCRAM |
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R P S SCRAM
Main Steam Line Isolation Valve Closure |
< 92% OPEN
Bypassed Rx Mode Switch NOT in "RUN" Channel Inputs (3/4 Lodgic) RPS A1 - MSIV A & B (inboard or outboard) RPS A2 - MSIV C & D (inboard or outboard) RPS B1 - MSIV A & C (inboard or outboard) RPS B2 - MSIV B & D (inboard or outboard) |
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R P S SCRAM
High Drywell Pressure |
> 1.68 psig
(1/2/2 Logic) Never Bypassed |
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R P S SCRAM
High Reactor Pressure |
> 1096 psig
(1/2/2 Logic) Never Bypassed |
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R P S SCRAM
Low Reactor Level |
< 12.5 psig
(1/2/2 Logic) Never Bypassed |
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R P S SCRAM
SRM Upscale Trip |
> 2x10-5 CPS
*Will initate Full Scram on either A or B trip Bypassed • When associated shorting links are installed • Any time associated SRM channel is bypassed |
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R P S SCRAM
IRM Upscale (High-High) |
> 120/125
Bypassed • Any time associated IRM channel is bypassed • Reactor Mode Switch in "RUN" |
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R P S SCRAM
IRM Inoperative (INOP) |
• Channel module unplugged or other hardware failure
• Channel Mode Switch (AER) not in "OPERATE" • high voltage supply low (<90V) Bypassed • Any time associated IRM channel is bypassed • Reactor Mode Switch in "RUN" |
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R P S SCRAM
APRM Neutron Flux Hi Trip |
> 118% Flux AND Mode Switch in RUN
OR > 15% Flux AND Mode Switch NOT in RUN ** Any 2 APRM trips will cause all 4 lodgic modules to trip (Full SCRAM) |
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R P S SCRAM
APRM Inoperable |
- Module unplugged
- Watch dog timer time-out - Chassis Mode Switch in INOP posistion - Self Test Critical Fault - Loss of Input Power ** Any 2 APRM trips (votes) will cause all 4 lodgic modules to trip (Full SCRAM) Bypassed All trips are bypassed if assoicated APRM Channel is bypassed |
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R P S SCRAM
APRM Simulated Thermal Power (STP) |
> = 0.65W + 61.7% (both recirc loops in operation)
> = 0.65(W-7.6%) + 61.5% (single loop operation enabled) or > 116.6% Clamp **Any two APRM trips will cause all 4 logic moduals to trip Bypassed All trips are bypassed if assoicated APRM Channel is bypassed Reactor Mode Switch NOT in "RUN" |
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R P S SCRAM
OPRM Trip |
Relative singal amplitude (1.12) and Consecutive Confirmation counts (14) (PBDA)
Relative singal amplitude (1.30) (ABA) Relative singal amplitude growth rate (1.30) GRBA **Any two OPRM trips will cause all 4 logic moduals to trip Bypassed OPRM Channel in enabled region (> 29.5% APRM STP, and < 60% recirculation drive flow) All trips are bypassed if assoicated APRM channel is bypassed at *0C603 panel fiber optic bypass switch |
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RPS SCRAM
Rx Mode Select Switch Posistion |
Mode Switch to Shutdown
Automatically Bypassed 10 seconds after scram - when rx mode switch is taken to shutdown there is a ten second time delay before the second bypass contact closes which ensures scram singal goes to completion before being reset/bypassed. |
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RPS SCRAM
Rx Manual SCRAM Push Buttons |
A1 or A2
AND B1 or B2 (1/2/2 Logic) Never Bypassed |
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Actions that occur on a Half SCRAM
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One Scram Pilot Valve will denergize and actuate but the other Scram Pilot valve will prevent the header from venting.
One contact on the Back Up SCRAM valve will close (valve will not energize or actuate) |
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Actions that occur on a Full SCRAM (7)
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Both SCRAM Pilot Valves will denergize and actuate
SCRAM Inlet and Outlet valves air will vent and valves OPEN Both Backup SCRAM valves will energize and actuate to vent air off the SCRAM air header. The SDV vent and drain pilot valves will deenergize and the SDV vent and drain valves will CLOSE. Ten second timer will start to prevent a SCRAM reset for ten seconds. SDV fills and inserts a redundant scram signal (must be in shutdown or refuel to bypass and drain volume) |
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Actions for resetting a full scram require (8)
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Verifying all rods inserted
Resetting RRCS and ARI Bypassing SDV high level trip SCRAM reset switch to the right for groups 1&4 and left for groups 2&3 verify 8 white lights are lit verify all blue lights on full core display are off (srcam valves closed) verify SDV vent and drains are open verify full core display lights show full in for all rods |
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RPS Power Supplies
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*AY160 & *BY160 provide AC power to the trip system
DC power supplies the two back up scram valves solenoids from the class 1E station batteries |
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Why is DC a preferred source to the UPS static inverters
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filters AC line transients and provides regulated voltage and frequency to the load even if the line voltage or frequency should vary.
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* AY160 Power supplies
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Preferred Source (Normally Selected)
*DA 250 DC to *A RPS & UPS Static Inverter (*AD160) through Bypass Switch & Series Breakers Alternate AC Source - TSC UPS (Primary Alternate) or *14A-G0F(secondary Alternate) |
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* BY160 Power supplies
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Alternate AC Source (Normally Selected) -
TSC UPS (Primary Alternate) through Bypass Switch & Series Breakers Preferred Source (Normally Bypassed) *DB2 250 DC to *B RPS & UPS Static Inverter (*BD160) or Alternate AC Source *14A-G0F(secondary Alternate) |
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* A(B)Y160 Series Breaker Trips
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Series Breaker Trips
Undervoltage ( < 110.7 VAC) Over voltage ( > 127.6 VAC) Underfrequency ( 57.05 Hz) |
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* AY160 Loads (7)
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RWCU & Recirc Console (*0C602 Panel)
Process Rad Monitoring Inboard valve Relay PNL Process Rad Recorders (*0C600 Panel) RPS Trip System 'A' Turbine EHC * AY185 APRM UPS Inverter (Alternate Source) |
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* BY160 Loads (6)
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Reactor Control & Feedwater Console (NI Recorders *0C603)
Process Rad Monitoring Outboard valve Relay PNL Process Rad Recorders (*0C600 Panel) RPS Trip System 'B' * BY185 APRM UPS Inverter (Alternate Source) |
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* AY185 Loads (2)
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Power Range Monitoring Cabinet Bus A
Safety Relief Valve Posistion Indication |
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* BY185 Loads (3)
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Power Range Monitoring Cabinet Bus B
Control Rod Posistion Info Cab Reactor Control & Feedwater Consol |
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* A(B)Y185 Power Supply
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Preferred Source - 125 VDC Dist Panel *PP01(2) (*A(B)D108)
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Failure of RPS
RO Actions on setpoints exceeded or light malfunctions |
- if setpoint currentlly exceeded - Manually SCRAM the Rx & Place Mode Switch in Shutdown
- if setpoint was exceeded but no longer is - Perform a GP-4 shutdown. - if half scram initatied and lights do not go out - immediatly insert a manual half scram on the affected trip system - if white lights go off then leave half scram in and investigate |
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One *C603 RPS light extinquished
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likely due to a fuse or blown bulb. A half scram on the other side will result in 1/4 of the rods scraming but the SDV vent and drains will not close.
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Blue SCRAM lights
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indicate that both SCRAM inlet and exhaust valves have opened.
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Effect of a failure of RPS to Scram (ATWS)
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turbine trip or MSIV closure will casue large pressure oscillations resulting in
SRVs opening and heating pool large power changes due to moderator density large level changes ECCS may initate depending on RPV level pressure and drywell pressure Feed water pump trips will cause RPV leve to decrease quickly and my cause ECCS initations Stuck open SRV will cause Supression pool tem to increase and result in decreased spression pool heat capacity |
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Effect of a loss of DC power
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RPS UPS inverters automatically switch to the alternate power source
power to the back up scram valves would be lost |
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Effect of a loss of *A(B)Y160 power
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Half SCRAM
Half lodgic for a MSIV isolation Various Process rad monitors trip DWCW isolates RECW isolates RWCU isolates A(B) SBGT fans start A(B) RERS fans start RE + RF supply & exhaust fans trip Instrument gass isolates bypass leakage barrier air to gas block valve and vent valve isolate leakage path shutdown cooling system isolates CAC and CAS vlaves close on both units if main turbine tirps recirc pumps trip on generator lock out Procedurally you have ten minutes to return power or RO is directed to manually scram due to RECW isolation and loss of cooling to Recirc Seals. or trip both recirc pumps. |
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RPS individual toggle switches on HCU for scram time testing
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two switches, one for each trip system (A & B). When the switch is taken from normal to test the assoicated scram pilot valve denergizes and provides a signal rod full SCRAM. If both switches are taken to test a full scram will occur on the signal rod.
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