Control Interlocks

Question 1

Describe the name, setpoint, coincidence, interlocks, and function of C-1.

Answer 1

IR Rod Stop
IR greater than 20% Amp equivalent
1/2
Blocked when trip is blocked, bypassed when trip is bypassed
Stops outward rod motion in manual or auto

Question 2

Describe the name, setpoint, coincidence, interlocks, and function of C-2.

Answer 2

PR Rod Stop
PR greater than 103%
1/4
Can be manually bypassed
Stops outward rod motion in manual or auto

Question 3

Describe the name, setpoint, coincidence, interlocks, and function of C-3.

Answer 3

OTDT Rod Stop + Turbine Runback
3% prior to OTDT trip setpoint
2/4
N/A
Stops outward rod motion in manual or auto, initiates turbine runback

Question 4

Describe the name, setpoint, coincidence, interlocks, and function of C-4.

Answer 4

OPDT Rod Stop + Turbine Runback
3% prior to OPDT trip setpoint
2/4
N/A
Stops outward rod motion in manual or auto, initiates turbine runback

Question 5

Describe the name, setpoint, coincidence, interlocks, and function of C-5.

Answer 5

Low Power Interlock
Less than 15% power by turbine impulse pressure
1/1
N/A
Stops outward rod motion in auto only

Question 6

Describe the name, setpoint, coincidence, interlocks, and function of C-7.

Answer 6

Loss of Load
10% step change or 5%/min for 120s by Impulse Pressure
1/1 (PT-506)
Manually Reset
Arms Steam Dumps in Tavg mode after a load rejection

Question 7

Describe the name, setpoint, coincidence, interlocks, and function of C-9.

Answer 7

Condenser Interlock
Condenser Pressure < 13” Hg Abs
2/2
N/A
Condenser available for steam dumps

Question 8

Describe the name, setpoint, coincidence, interlocks, and function of C-11.

Answer 8

Control Rod D Rod Withdrawal Limit
223 Steps
N/A
N/A
Stops outward rod motion of Bank D in auto only

Question 9

Describe the name, setpoint, coincidence, interlocks, and function of C-20.

Answer 9

AMSAC Armed
Impulse Pressure > 40%
2/2
Disable AMSAC when 1/2 < 40% after 360s delay
Arms AMSAC Circuit