Reactor Trip

Question 1

What are automatic RX trip entry conditions?

Answer 1

Question 2

What are the manual required RX trip entry conditions?

Answer 2

Question 3

What are immediate actions and contingencies for RX trip PB?

Answer 3

1) If RX fails to trip depress backup CRD power supply breaker PBs on C03 (A-501 and B-631)
2) If backup PBs fail, Manually insert rods and send operator to open CRD breakers
3) If more than one rod fails to FULLY insert or power not dropping perform RT-12

Question 4

What are the immediate action contingencies for the turbine?

Answer 4

1) If 125V DC Bus D01 de-energized by turbine trip solenoid light out and breaker position indication for A3 and odd bus 480v on C10 and either D01 undervoltage alarm or D01 < 105v locally then transfer D11 to emerg supply D02 on C10 and perform loss of D01 AOP in conjunction.
2) If either SG < 900#, actuate MSLI for affected SG, actuate EFW, check SCM adequate and perform RT-6 (EFW and MSLI). Go to Overcooling or LOSCM.

Question 5

What immediate action contingencies are required for loss of SCM?

Answer 5

1) If < 2 minutes then trip all RCPs. If > 2 min then leave RCPs running.
2) Perform LOSCM or Degraded Power

Question 6

What steps are performed for the primary plant after immediate actions?

Answer 6

CV-1223 (orifice bypass) demanded to zero, BWST outlet open, PZR level setpoint to 100” if emergency boration not in progress.

Question 7

What steps are performed if bus A3 or A4 is de-energized?

Answer 7

1) Check for LO relay trip alarm
2) Check EDG running (RT-21) -> If not running then investigate and place AAC generator on bus using 1107.002.
3) Reset DG output breaker anti pump feature by taking to PTL if diesel running and output breaker open. If EDG output breaker won’t close then check A1/A2 energized and attemp to close A-309/A-409 using sync switch.

Question 8

What actions are performed if A1 or A2 de-energized and needed?

Answer 8

1) Check LO relay alarm clear.
2) Check SU1 voltage >/= 22KV
3) Energize dead bus from SU1 using sync switch. If fails to close reset anti-pump.
3) If unable to feed from SU1, energize A1/A2 from SU2 using Att E of 1107.001 for loading and energize loads as necessary.

Question 9

What is required for SU2 transformer to be considered available?

Answer 9

1) Voltage Reg out of service with voltage >/= to 162.5 KV

OR

2) Voltage Reg in service in automatic with 3% voltage reduction disabled and voltage >/= 155.4 KV.
3) Unit 2 loads on SU2 are BOTH vital loads only or = 4.4 MVA
4) One or Both 161KV lines in service (Russ or P Hill)

Question 10

What actions are taken if normal makeup and seal injection not in service?

Answer 10

1) Isolate L/D (CV-1221 or 1214/1216)
2) If Seal Inj and Seal cooling both lost and not restored in 2 min then Trip RCPs, monitor for reverse rotation and perform RCP AOP
3) Restore using RT-1

Question 11

What actions are taken if SG levels > 410”?

Answer 11

1) Trip Both MFPs
2) Place overfilled SG EFW steam supply in man and close (CV-2667/2617)
3) Perform RT-5 for EFW
4) If SG pressure < 650#, trip all condensate pumps

Question 12

What IA pressure is checked and what actions are taken if it’s less than 35 psig?

Answer 12

IA header pressure is checked > 75#

If < 35#

1) Actuate EFW and MSLI for both SGs and perform RT-6.
2) Perform loss of IA in conjunction

Question 13

What actions are performed if NNI/ICS power not available per RT-20?

Answer 13

1) Perform AOP in conjunction if loss of NNI power

If ICS AC or DC then,

1) Actuate EFW and perform RT-5
2) Trip both MFPs
3) Perform ICS AB Ops in conjunction.

Question 14

What transition occurs if SG pressure < 900 psig?

Answer 14

Transition to Overcooling

Question 15

What actions are taken for MSSV open?

Answer 15

1) Attempt to reset by adjusting opening SG TBV in hand until alarm clears or 700 psig is reached.
2) Return to auto
3) If fails to restore above 900# go to Overcooling
4) GAG MSSV

Question 16

What actions are performed for MSIV inadvertently closed?

Answer 16

1) Open FW discharge X-tie (If fails to open actuate EFW and perform RT-5)
2) Trip associated MFP
3) Verify ADV isolation open and that ADV controls 1000 - 1040 psig.
4) Check for indications of tube leakage on SG high range rad monitor.

Question 17

What actions are performed if Turbine Bypass valves not controlling 950 - 1020 psig?

Answer 17

If TBVs failed closed, then

1) If vacuum > 23”, depress low vacuum reset PBs on C02 and verify TBVs operate in hand and place them in auto.
2) If Vacuum < 23” or TBVs fail to work after PBs depressed, verify ADV isolation open and ADVs controlling 1000 - 1040 psig and check for tube leakage on MS High range monitor.

Question 18

What actions are taken for MFW block valve failing to close?

Answer 18

1) Place ICS override switch in override and close block valve. If fails then actuate EFW and close the associated loops MFIV. Perform RT-5.

Question 19

What actions are taken for Lo Load Block Valve failing to close?

Answer 19

1) Place in ICS override and attempt to close.

If fails to close, then

1) Close LL valve

If LL fails to close

1) Actuate EFW, Close associated MFIV and perform RT-5.

Question 20

What actions are taken if SU valve not maintaining 20 - 40” SG level?

Answer 20

1) Place in hand and maintain 20 - 40”

If fails to open,

1) Actuate EFW, Close associated MFIV and perform RT-5.
2) If SG level already lowered to 11”, perform RT-5 for EFW.

Question 21

What actions are taken if MFPs unable to maintain > 70 psid across SU Valves?

Answer 21

1) If both MFPs operating open FW pump discharge X-tie (If fails to open Actuate EFW and perform RT-5)
2) Trip bad MFP
3) If both MFPs are tripped perform RT-5

Question 22

What transition is made if ESAS actuation alarms are in?

Answer 22

Go to ESAS.

Question 23

What actions are performed if RCS pressure < 1700 psig?

Answer 23

1) Isolate Letdown
2) Perform RT-2 for HPI
3) Verify ERV isolation closed and place PZR spray in manual and ensure closed. Close PZR spray isolation.
4) Verify all PZR heaters on
5) If RCS pressure < 1550 psig Go to ESAS.

Question 24

What actions are performed if PZR level < 55”?

Answer 24

1) Operate CV-1235 in hand and control at 90 - 110” if not responding in auto.
2) If < 55” and no ind of recovery, isolate letdown.
3) Ensure PZR heaters off.
4) If < 30” then initiate RT-2.

Question 25

How is PZR steam space integrity checked and what actions are taken if it is not adequate?

Answer 25

1) Verify PZR spray valve closed
2) Verify ERV isolation closed
3) Use all available PZR heaters to maintain RCS pressure
4) If PZR level continues to rise without rise in temp or pressure then re-open CV-1000, If RCPs off restart one RCP in each loop using RT-11 or GO TO Natural Circ Cooldown if RCPs not available. If RCPs running GO TO Forced Flow C/D.

Question 26

What actions are performed if no RCPs are running?

Answer 26

1) Verify EFW (RT-5)
2) If unit 2 has loads on SU2, then do not start RCP if unit 1 aligned to SU2 due to potential for millstone relays to actuate.
3) If H1 or H2 energized and SCM adequate and RCPs available, start one RCP per loop (RT-11)
4) If RCPs unavailable and cooldown to be performed, perform Natural Circ C/D in conjunction

Question 27

What actions are performed if RB pressure > 17 psia?

Answer 27

If RB pressure > 17 psia and rising perform RT-9 to maximize RB cooling.

Question 28

What actions are performed if using EFW or CFW and P-75 available?

Answer 28

Perform RT-16B to feed intact SG with Aux FW pump.

Question 29

Where does RX trip transition to at the end of EOP?

Answer 29

1102.006 (Reactor Trip/Outage Recovery) “Establishing stable mode 3 conditions”.

Question 30

What steps (floating step) are performed if RCS pressure < 1700 psig or PZR level < 30”?

Answer 30

Perform RT-2.