Pzr pressure control Flashcards
Unit 1 is at 100% power with all systems in a normal lineup.
‘A’ Class Backup Heaters are energized for breaker testing.
RCN-PIC-100, Pressurizer Pressure Master Controller, is in AUTO with a setpoint of 2250 psia and an output of 35%.
Pressurizer Pressure is stable.
The RO lowers the setpoint on RCN-PIC-100 to 2230 psia.
Which of the following will occur?
A. Output will lower, and pressurizer spray valves will throttle open.
B. Output will lower, and proportional heater current will lower.
C. Output will rise, and pressurizer spray valves will throttle open.
D. Output will rise, and proportional heater current will lower.
C
Unit 1 is at 100% power with all systems in a normal lineup.
RCN-PIC-100, Pressurizer Pressure Master Controller, is in AUTO with a setpoint of 2250 psia and an output of 16%.
Pressurizer Pressure is stable.
The RO lowers the setpoint on RCN-PIC-100 to 2230 psia.
Which of the following will occur?
A. Output will lower, and pressurizer spray valves will throttle closed.
B. Output will lower, and proportional heater current will lower.
C. Output will rise, and pressurizer spray valves will throttle closed.
D. Output will rise, and proportional heater current will lower.
D
Unit 1 is at 100% power with all systems in a normal lineup.
RCN-PIC-100, Pressurizer Pressure Master Controller, is in AUTO.
The RO adjusts the setpoint on RCN-PIC-100 to 2190 psia.
One minute later, the RO notes Pressurizer Pressure is stable at 2190 psia and RCN-PIC-100 is at 40% output.
Based on these indications, the pressurizer backup heaters are ___(1)___, and the pressurizer main spray valves are ___(2)___.
A. (1) on; (2) full open
B. (1) on; (2) throttled open
C. (1) off; (2) full open
D. (1) off; (2) throttled open
B
Unit 1 is at 100% power with all systems in a normal lineup.
RCN-PIC-100, Pressurizer Pressure Master Controller, is in AUTO.
RCN-HS-110, Pressurizer Level Channel Selector Switch, is in CH-Y
RCN-HS-100, Pressurizer Pressure Channel Selector Switch, is in CH-X
RCN-HS-100-3, Heater Level Cutout Switch, is in BOTH.
A fault causes PNA-D25 to de-energize.
With no operator action, how will this failure affect the Pressurizer Pressure Control System?
A. RCN-PIC-100 output will lower to 0%, and proportional heaters will have full heat output.
B. RCN-PIC-100 output will rise to 100%, and proportional heaters will have full heat output.
C. RCN-PIC-100 output will lower to 0%, and proportional heaters will have no heat output.
D. RCN-PIC-100 output wil rise to 100%, and proportional heaters will have no heat output.
C
Unit 3 is at 100% power with all systems in a normal lineup.
RCN-HS-100, Pressurizer Pressure Channel Selector Switch, is in CH-X
The main turbine trips, causing RCS pressure to rise.
The pressurizer heaters will trip as soon as ___(1)___ reaches ___(2)___.
A. (1) RCN-PT-100X ONLY; (2) 2285 psia
B. (1) RCN-PT-100X OR 100Y; (2) 2285 psia
C. (1) RCN-PT-100X ONLY; (2) 2383 psia
D. (1) RCN-PT-110X OR 100Y; (2) 2383 psia
A
