P's, C's, & T's

Question 1

P-4

Answer 1

Rx Trip Permissive

Rx Trip and Bypass Breakers Open

• Trips Main Turbine
• FWIS w/ Low T_avg (564°F)
• Prevents re-actuation of SI after Reset
• Transfers CSDs from Load Reject to Plant Trip
• Arms Steam Dumps

Question 2

P-6

Answer 2

Source Range Permissive

IR > 10^-10 Amps (1/2)

• Permits Block of SR Trip

Question 3

P-7

Answer 3

At-Power Permissive

P-10 or P-13 (1/2)

• Unblocks the following trips:
  
  • PZR High Level
  • PZR Low Pressure
  • Low Flow in > 1 Loop
  • RCP UV
  • RCP UF

Question 4

P-8

Answer 4

3 Loop Flow Permissive

PR > 48% (2/4)

• Unblocks Low Flow in 1 Loop Trip

Question 5

P-9

Answer 5

Turbine Trip - Rx Trip

PR > 50% (2/4)

• Unblocks Rx Trip on Turbine Trip

Question 6

P-10

Answer 6

Nuclear at Power

PR > 10% (2/4)

• Feeds P-7
• Blocks SR HV
• Permits Block of:
  
  • IR Trip
  • IR Rod Stop
  • PR Low Setpoint Trip

Question 7

P-11

Answer 7

Pressure SI

< 1970 psig (2/3)

• Permits block of:
  
  • Low Pressure SI
  • Low Steam Pressure SI/SLIS
    
    • Enables SLIS on Hi Negative P_stm Rate

Question 8

P-12

Answer 8

Low-Low T_avg

550°F (2/4)

• Blocks steam dumps (CSDs)

Question 9

P-13

Answer 9

Turbine at Power

P_imp > 10% (1/2)

• Feeds P-7

Question 10

P-14

Answer 10

S/G High Level

SG Level > 91% (2/4 LTs on 1/4 S/Gs)

• Trips MFPs
• Trips Main Turbine
• FWIS

Question 11

All Rx Trips

• Trips
• Setpoints
• Coincidence/Interlocks
• Protection

Answer 11

Question 12

C-1

Answer 12

IR Rod Stop

20% PR Equivalent (IR Amps) - 1/2 IR channels

• Stops outward rod motion

Question 13

C-2

Answer 13

PR Rod Stop

103% - 1/4 PR (Can Be Bypassed)

• Stops outward rod motion

Question 14

C-3

Answer 14

OTΔT Rod Stop & Runback

OTΔT Trip - 2%: 2/4

• Stops outward rod motion & causes turbine runback

Question 15

C-4

Answer 15

OPΔT Rod Stop & Runback

OPΔT Trip - 2% on 2/4

• Stops outward rod motion and causes turbine runback

Question 16

C-5

Answer 16

Low Power Interlock

15% Power by P_imp

• Auto Rod Withdrawal disabled.

Question 17

C-7

Answer 17

Loss of Load

10% Step or 5%/min decrease in P_imp

• Manually Reset (PT-506 Only)
• Arms steam dumps in T_ave Mode

Question 18

C-9

Answer 18

Condenser Interlock

Cond. Pressure < 6.0” HgA (2/2 per shell, there is one C-9 for each condenser)

• Condenser available for CSDs.

Question 19

C-11

Answer 19

Control Bank ‘D’ Rod Withdrawal Limit

223 Steps

• Auto Rod Withdrawal disabled

Question 20

C-20

Answer 20

AMSAC

P_imp > 40% on 2/2 (505 & 506)

• Arms AMSAC