Reactor Regulating System Flashcards
Which of the following conditions will cause an automatic motion inhibit?
A. Control Channel #1 fails low while RRS is selected to channel 1.
B. TLI #1 fails low while RRS is selected to channel 1.
C. Thot #1 fails low while RRS is selected to channel 1.
D. Tcold #1 fails low while RRS is selected to channel 1.
A
Unit 1 is at 90% power.
Regulating Group 5 is at 135”.
CEDMCS is in Auto Sequential.
RRS NI Control Channel selector switch is selected to channel 1.
All other systems are in a normal lineup.
NI Control Channel #1 fails high.
With no operator action, what is the expected plant response?
A. CEAs will move outward a few steps
B. CEAs will move inward a few steps
C. CEAs will move inward continuously
D. CEAs will not move due to automatic motion inhibit.
B
Unit 1 is at 90% power.
Regulating Group 5 is at 135”.
CEDMCS is in Auto Sequential.
RRS Tavg selector switch is selected to channel 1.
All other systems are in a normal lineup.
Tavg channel 1 fails high.
With no operator action, what is the expected plant response?
A. CEAs will move outward a few steps
B. CEAs will move inward a few steps
C. CEAs will move inward continuously
D. CEAs will not move due to automatic motion inhibit.
C
Unit 1 is at 99% power and stable.
Tavg is 581 degrees F and stable.
Tref is 586 degrees F and stable.
Regulating Group 5 is at 135”.
CEDMCS is in Manual Sequential.
The RO places the CEDMCS mode selector switch to Auto Sequential. How will CEDMCS respond?
A. Regulating Group 5 will step out at 30 inches/min.
B. Regulating Group 5 will step out at 3 inches/min.
C. Regulating Group 5 will step in at 3 inches/min.
D. Regulating Group 5 will step in at 30 inches/min.
B
Unit 1 is at 80% power and stable.
Tavg is 586 degrees F and stable.
Tref is 581 degrees F and stable.
Regulating Group 5 is at 135”.
CEDMCS is in Manual Sequential.
The RO places the CEDMCS mode selector switch to Auto Sequential. How will CEDMCS respond?
A. Regulating Group 5 will step out at 30 inches/min.
B. Regulating Group 5 will step out at 3 inches/min.
C. Regulating Group 5 will step in at 3 inches/min.
D. Regulating Group 5 will step in at 30 inches/min.
D
Consider the following component alignments:
1. Pressurizer Level Control System in LOCAL
2. Steam Bypass Master Controller in LOCAL
3. Digital Feedwater Control Master Controllers in MANUAL
4. CEDMCS in Manual Sequential
Which combination of alignments will allow the Reactor Regulating System to be placed in TEST?
A. 1 and 2
B. 1 and 3
C. 1 and 4
D. 2 and 4
C
Unit 2 is at 100% power with all systems in a normal lineup.
TLI channel 2 fails low.
Based on these conditions, with no other operator action, automatic withdrawal prohibit (AWP) is ___(1)___, and automatic motion inhibit (AMI) is ___(2)___.
A. (1) clear; (2) clear
B. (1) in alarm; (2) clear
C. (1) clear; (2) in alarm
D. (1) in alarm; (2) in alarm
D
Unit 2 is at 100% power with all systems in a normal lineup.
NI Control Channel 2 fails low.
Based on these conditions, with no other operator action, automatic withdrawal prohibit (AWP) is ___(1)___, and automatic motion inhibit (AMI) is ___(2)___.
A. (1) clear; (2) clear
B. (1) in alarm; (2) clear
C. (1) clear; (2) in alarm
D. (1) in alarm; (2) in alarm
C
Unit 1 is at 100% power with all systems in a normal lineup.
The core is at 25 EFPD.
‘A’ Main Feedwater Pump trips on overspeed.
The RO notes that a reactor power cutback has occured, and Regulating Group 3 CEAs are stepping inward.
With no operator action, the RO should expect CEA motion to continue until:
A. TLI is less than 15%
B. Control Channel power is less than 50%
C. Tave is two degrees higher than Tref
D. Tave is two degrees lower than Tref
C
