CVCS Flashcards
What are the power supplies to the Charging Pumps?
A pump: PGA-L31
B pump: PGB-L32
E pump: either PGA-L35 or PGB-L36 (Swap breaker and transfer local disconnect switch)
What is the mnemonic for actuations of CHB-UV-515, CHA-UV-516, CHB-UV-523?
Si-Hi Si-Ci Ci-Hi
CHB-UV-515 SIAS or Hi Temp on the outlet Regen HX 413
CHA-UV-516 SIAS or CIAS
CHB-UV-523 SIAS or Hi Temp on Letdown HX Outlet 135
Explain a loss of control air on the Letdown Backpressure Controller CHN-PIC-201
Valves go closed, letdown diverted to the EDT
Where can you operate VCT Outlet Valve (UV-501)?
B03 in Control Room or locally at NHN-M72
If VCT level transmitter LT-227 fails High, how will the plant respond?
LT-226 will control between 34% and 44% in VCT
If VCT level transmitter LT-226 fails Low, how will the plant respond?
LT-227 will control between 58% and 60%
What temperature will cause the RCP Seal Injection Isolation valve (CHN-UV-231P) to isolate?
150f
Fill in the chart for Anti-pumped Charging pumps
LOP LOOP LOPw/SIAS LOOPw/SIAS
Always
Normal
Standby
LOP LOOP LOPw/SIAS LOOPw/SIAS
Always Anti Anti
Normal Anti
Standby
What is the normal status of CHN-UV-532 RWT to BAMP isolation valve?
Why?
hand-jacked Open with air removed
to prevent an inadvertent isolation of boration flow paths
What are the auto-actions of CHN-UV-567 Gas Stripper Outlet Valve?
on LT-227 goes above 60%, will shift to direct letdown flow to the Holdup Tank
What gives you the BLUE light for the RMWP’s?
Reactor Makeup Water Tank Lo-Lo
loss of control power
Lo Discharge Pressure
How does CHN-PDV-240 fail on:
loss of power
loss of air
Fails closed on:
* Loss of Air
* Loss of Power (Non-class DC power)
Why is only one Letdown Control valve in service during normal operations?
During normal operation, only one LD Control Valve (110P/110Q) is selected for operation, as
sufficient differential pressure between normal RCS operating pressure and the pressures in the
CVCS system to drive letdown flow at the needed flowrate.** Having only one Letdown Control
Valve aligned for operation ensures that the relief capacity of CHN-PSV-345, the Letdown
Intermediate Pressure Relief valve, is not exceeded.**
What happens if the “Reactor Make-up Flow Alarm Arming Switch” (CHN-HS-37) is placed in the “NORM OEPR” position while refueling?
Makeup water flow will NOT cause an alarm
Is the reactor makeup water flow normally armed during Normal or Refueling ops?
Refueling Ops
