CVCS Flashcards
If all charging pump breakers go open what happens to the letdown HCV’s?
HCV 1200A, 1200B and 1200C go closed when no charging pumps are operating.
Other than CVCS what other systems use the letdown filter?
RHR and Reactor Purification
What is Normal Excess letdown flow?
15GPM
When purging the VCT what gas is added?
Nitrogen.
What happens on a high VCT signal?
LCV-1115A will go full open and divert to the PDT.
Other the the MCR, where can we operate the charging pumps from?
Auxiliary Shutdown Panel.
Why do we use caution when raking the charging pump breakers.
Could possibly trip the other charging pump.
What position do you place the charging pump dampers when you are done with manual operation?
The original, pulled out position will allow it to operate in automatic.
Which flows use the seal return heat exchanger
Excess Letdown
Charging pump mini flow recirc
Seal return
Where is excess letdown normally aligned to.
Normally directed to the seal return header and diverted to the PDTT
1204 A and B reposition to what on an SI signal?
Closed
Do we use PCV-1114 during a Boration?
PCV-1114 is NOT used during a boration
Auto closure and Fail positions for:
LCV-1460 A&B
Auto closes on PZRlevel of 14.4% Fail closed (app R)
Auto closure and fail position of CH-TV-1204 A&B?
Close on SI signal and fails closed
Auto closure and fail position of PCV 1145
Controls back pressure at 300#
Fails open
Auto and fail position of TCV-1143
Divert letdown to VCT at 145 F.
Fails to divert
fail position of HCV-1244
Fails to Direct letdown to VCT
VCT Controller 1115 controls what?
85% - Divert 115A to PDT 82% - High level alarm 34% - Auto makeup stops 27% - Auto makeup starts 24% - low level alarm 13% - signal to isolate VCT (2/2 w/ 1112)
Sources of water to Normal CHP suction?
VCT RWST B LHSI pump Other unit RWST Emergency Borate line Manual Borate Manual Dilute Blender Chemical addition tank Seal return
Sources of water to the Alternate CHO suction
A LHSI pump discharge only
Flowpath from the Normal CHP disch header?
Normal CH line to B cold leg
RCP seal injection
Aux Spray
HHSI to Hot or Cold legs
Alternate CHP Disch possible flowpath?
Loop fill
RCP seal injection
HHSI to Hot or Cold legs
Which two CH pumps can use the cross tie?
1-CH-P-1C
2-CH-P-1C
What 3 flows connect into the seal return line.
Seal return
Excess Letdown
CHP miniflow recirc
State the CHP auto starts…
For each: -Low disch pressure of <1176 psig for 10sec.
- SI signal
(A - A, B - B, C - A or B)
-UV/DV on opposite emergency bus
-Both other CHP breakers openCH pump trips:
Phase Over current or Ground
Switch in PTL
A) UV/DV on H bus and C normal pump breaker closed and running
B) UV/DV on J bus and C alt breaker closed and pump running
C) UV/DV on H bus and A pump still running with breaker closed after 1sec
