Pressurizer Level Control

Question 1

What is the power supply for the PLCS master controller?

Answer 1

NNN-D11

Question 2

What are the power supplies for LT-110X and LT-110Y?

Answer 2

LT-110X = NNN-D12

LT-110Y = NNN-D11

Question 3

How does the PLCS level setpoint vary with Rx Power?

Answer 3

Question 4

How does a loss of PNA-D25 affect PLCS? How does this differ from a loss of NNN-D12?

Answer 4

• LT power: PNA-D25 (110X) and PNB-D26 (110Y)
• LT Output to PLCS power: NNN-D12 (110X) and NNN-D11 (110Y)

Question 5

Describe RCN-LIC-110 PLCS Master Controller

Answer 5

Master Level Controller (LIC-110, aka Level Setpoint Control)
* Red pointer: actual level from selected channel (LT-110X or LT-100Y)
* Black on white pointer: remote setpoint from RRS (based on Tavg)
* Black pointer: local setpoint from thumbwheel.
(powered from NNN-D11)

Question 6

At what level deviation will the Normal and Standby charging pumps start/stop?

Answer 6

“Always Running” – PLCS has no control
“Normally Running”
+15% ↑ stops normally running pump (level is too high)
+14% ↓ starts normally running pump (level returning to program)
“Standby”
-23% ↓ starts standby pump (level is too low)
-14% ↑ stops standby pump (level returning to program)

Question 7

What does the output of RCN-LIC-110 PLCS Master Controller affect?

Answer 7

Letdown flow - LIC output controls letdown LCVs (LV-110P/Q), more output is more letdown flow.
(charging pumps are affected by setpoint)

Question 8

What are the letdown flow rates when RCN-LIC-110 PLCS mater controler is in auto? In Manual?

Answer 8

Auto 30-135 gpm
Manual 0-150 gpm

Question 9

What happens to pressurizer heater trips on the B Train when operated in LOCAL from the Remote Shutdown Panel?

Answer 9

Trips are cut out of the circuit, i.e. the trips will not work