Pzr level control Flashcards
Unit 1 is at 100% power with all systems in a normal lineup.
Pressurizer Level Channel Selector Switch RCN-HS-110 is in CH-X.
Pressurizer Level Master Controller RCN-LIC-110 is in REMOTE-AUTO.
Charging Pump Mode Selector Switch CHN-HS-4 is in 1-2-3.
T-hot instrument RCN-TT-111X fails low.
Over the next 30 seconds, with no operator action, which of the following will occur?
A. RCN-LIC-110 output will go down.
B. Letdown flow will go down.
C. Charging flow will go down.
D. VCT level will go down.
C
Unit 1 is at 100% power with all systems in a normal lineup.
Pressurizer Level Channel Selector Switch RCN-HS-110 is in CH-X.
Pressurizer Level Master Controller RCN-LIC-110 is in REMOTE-AUTO.
Charging Pump Mode Selector Switch CHN-HS-4 is in 1-2-3.
T-hot instrument RCN-TT-111X fails low.
Over the next minute, with no operator action, which of the following will occur?
A. Backup heaters will energize.
B. Charging flow will go up.
C. Prezzurizer Level will go up.
D. Letdown control valves will modulate closed.
A
Unit 3 is at 100% power with all systems in a normal lineup.
All charging pump handswitches are in AUTO-AFTER STOP (green flagged).
Charging Pump Mode Selector Switch CHN-HS-4 is in 1-2-3.
NKN-D42 develops a ground and de-energizes.
What is the impact on charging pump operation?
A. All running charging pumps will trip and cannot be restarted.
B. All running charging pumps will trip, but all charging pumps may be started by going to START on control room handswitches.
C. Charging pump control power is lost; pumps must be operated locally at their supply breakers.
D. All running charging pumps except for the ‘A’ charging pump will trip, but all charging pumps may be started by going to START on control room handswitches.
B
Unit 1 is at 50% power.
Pressurizer Level Channel Selector Switch RCN-HS-110 is in CH-X.
Pressurizer Level Master Controller RCN-LIC-110 is in REMOTE-AUTO.
Charging Pump Mode Selector Switch CHN-HS-4 is in 1-2-3.
T-hot instrument RCN-TT-111X fails low.
Over the next 30 seconds, with no operator action, which of the following will occur?
A. RCN-LIC-110 output will go down.
B. Letdown flow will go down.
C. Charging flow will go down.
D. Pressurizer level will go down.
D
Unit 2 is at 100% power with all systems in a normal lineup.
The in-service letdown control valve fails closed due to an instrument air line break.
With no operator action, which of the following will occur first?
A. PZR LVL HI-LO alarm
B. All Presurizer Heaters trip off
C. Pressurizer Backup Heaters energize
D. Normally running charging pump trips
C
