CVCS Flashcards
When is RHR purification used
When RCS pressure is insufficient to supply letdown
Used in conjunction with normal charging
When is RHR slipstream used
Used for purification during charging outages
no inventory control
Discuss CS-V-459/460
normal letdown isolation valves
auto closes on <17% PZR AND
CS-V-145 not full open
Discuss CS-V-145
LCV-459/460 and CS-V-149/150 are all open and PZR level >17% for 145 to go open Auto close: - <17% PRZ Level or - CS-V-149/150 not full open - LCV-V-450/460 not full open
Discuss CS-HCV-189/190
Controls letdown flow and reduces letdown pressure (PCV-131 controls pressure)
Discuss CS-V-149/150
Containment isolation valves
Auto Close on HELB or T-signal
Either valve not full open will close CS-V-145
What cools LTDN HX (CS-E-4)
A Train PCCW
Discuss CS-PCV-131
Letdown pressure control valve
Maintains 350# downstream of the drag valves
What closes LCV-112B/C
Suction for CCP from VCT
Auto close on Lo-Lo VCT level (5%, 2 of 2)
Or S-signal
closes after LCV-112D/E are full open
Discuss LCV-112D/E
CCP suction from RWST
Auto open on VCT lo-lo level 5% (2 of 2)
Or S-signal
Discuss CS-FCV-121
Control total pump flow rate: charging + seal injection
PZR master level controller controls position of FCV-121 when in auto
Discuss CS-HCV-182
Charging Header Back Pressure control Valve
Controls seal injection flow rates by controlling back pressure supply to the seals
Discuss CS-V-142/143
Containment charging isolation valves
- auto closes on S-Signal
Discuss CS-V-177/180
Charging loop isolations
provides path for alternate charging flow between loops 1 and 4
Discuss CS-V-185
PZR alternate spray valve
CS/PZR delta-T must be <320F
Discuss CS-V-167/168
Seal return and excess letdown containment isolations
Auto close on T-signal
State interlocks on CS-LCV-459/460
CS-LCV-459/460 cannot be opened unless 145 is fully closed and PZR level >17%
Auto Close if PZR level is <17% and CS-V-145 goes off open seat
State interlocks for CS-V-145
can not be opened unless LCV-459/460 and CS-V-149/150
Auto close on PZR lo Level <17% or LCV-459/460 not full open or CS-V-149/150 not full open
State interlocks for CS-V-149/150
Closes on T-signal or HELB
State interlocks for LCV-112B, C, D, E
112B,C will not auto close until 112D,E are full open
State interlocks for PDP
PDP will not auto start unless CS-V-205 is full open
State interlocks for CCP miniflow
CS-V-196/197
Auto close on SI if CCP flow >=122.5GPM
Opens if flow <= 82.5GPM
State CVCS system response on SI
Both CCPs starts
SI-V-138/139 open (HHI to all cold legs)
CS-LCV-112D/E open
CS-V-142/143 Charging header isolations close
CS-V-196/197 Min flow isolations close if flow >=122.5GPM
State CVCS system response on T-signal
Close CS-V-149/150 Containment Isolations
- Either valve not full open will cause CS-V-145
Close CS-V-167/168 Seal water return isolations
State CVCS system response on LOP
Both CCPs immediately start when bus 5 and 6 are reenergized
State CVCS system response on HELB
CS-V-149/150 Containment isolations will close
- Either valve not full open will cause CS-V-145 to Auto Close
State Gallon per percent in VCT
31.25 gallons per %
State Auto make up setpoints
Driven off of LT-112 only
50% auto make up off
30% auto make up on
Discuss LT-112 failing LOW
Auto makeup is on
Low Level alarm is in
eventually VCT will divert due to high level (LT-185)
Discuss LT-112 Failing HIGH
LCV-112A will divert to PDT
Auto make up is blocked
Auto swap to RWST as CCP suction at 5% VCT is blocked (2 of 2 logic)
