Control Permissives (C's)

Question 1

Control Permissives

Answer 1

C-1 IR High Flux Rod Stop
C-2 PR High Flux Rod Stop
C-3 OTdeltaT Rod Stop & Turbine Runback
C-4 OPdeltaT Rod Stop & Turbine Runback
C-5 Auto Rod Stop
C-7 Load Rejection
C-9 Condenser Available
C-11 Control Bank D rod Stop
C-20 AMSAC Interlock

Question 2

C-1

Answer 2

IR High Flux Rod Stop: >20% (setpoint), 1/2 (logic), Block Auto and Manual Rod Withdrawal (permissive)

Question 3

C-2

Answer 3

PR High Flux Rod Stop: >105% (setpoint), 1/4 (logic) - Block Auto and Manual Rod Withdrawal (permissive)

Question 4

C-3

Answer 4

OTDT Rod Stop & Turbine Runback: 3% below trip (setpoint), 2/4 (logic), Block Auto & Manual Rod Withdrawal & Turbine Runback (permissive)

Question 5

C-4

Answer 5

OPDT Rod Stop & Turbine Runback: 1% below (setpoint), 2/4 (logic), block auto and manual rod withdrawal & turbine runback (permissive)

Question 6

C-5

Answer 6

Auto Rod Stop: PT-173 <15% (setpoint), 1/1 (logic), block auto rod withdrawal (permissive)

Question 7

C-7

Answer 7

Load Rejection: Median Value of PT-1-72, PT 1-73, and PT 47-13 senses a load decrease > 10% in a 2 minute time constant (setpoint), 1/1 (logic), Arm Steam Dumps in Tave Mode (permissive)

Question 8

C-9

Answer 8

Condenser Available : Validated Condenser Press <3.44 psia AND CCWP bkr racked in & closed (setpoint), 2/2 - 1/3 (logic), Enable Steam Dumps (permissive)

Question 9

C-11

Answer 9

Control Bank D Rod Stop: 220 Steps (setpoint), 1/1 (logic), Block Auto Rod Withdrawal (permissive)

Question 10

C-20

Answer 10

AMSAC Interlock: >40% Rx Power Equivalent (setpoint), 2/2 PT’s (logic), Arms ATWS mitigation system actuation
circuit (permissive)