Systems Exam 2 - CVCS Flashcards
PS-5385/5385A (upstream of PCV-131) also provides local pressure indication and HELB alarm at…
≤ 200 psig
Closure of 8152 or 8160 (CIV downstream of orifice valves) will cause relief valve 8117 to lift and discharge to the PRT, resulting in a….
LOCA. Operator action required to isolate LTDN at this point.
Letdown HX Outlet Temp
95°F
Purpose of the mixed bed demins
Remove ionic impurities from the RCS
VCT Backpressures
-> 15psig for Seal #1 backpressure for adequate for to #2 Seal
-10 psig when degassing to prevent reverse pressurization on RCP seal
The CCP miniflow relief valves can relieve up to what quantity?
84 gpm/relief
What PDP speed is required to maintain adequate oil pressure?
55 gpm. Otherwise the PDP is likely to trip on low oil pressure (4 psig) 90 seconds after breaker closure.
How does PDP speed fail on loss of air?
High speed
What is required to start the PDP?
-8109 must be open
-No train A BO (OL)
-No train A SI (AL)
PDP Trips
-Train A SI (breaker is load shed)
-Low Lube Oil Pressure
-Undervoltage
-Overcurrent
What is the power supply for LCV-459/460?
-supplied from Train A only
-Note that they also auto close on Train A SI ONLY
8149A,B,C Orifice Isolation Auto Closes
- Low PZR L (17% on selected level channel)
- When LCV-459/460 come off full open limit switch
- Loss of control power or air
HCV-128 RHR to Letdown Line power supply and use
-uPC1
-Used when RHR is aligned to letdown for Modes 4-6. Used full open and flow is controlled via PCV-131.
-can come from either train RHR
TCV-129 CVCS Demin Bypass purpose and setpoints
Used to divert around demineralizers at 135°F due to input from TIS-129. BTRS TIS-382 will also divert the valve at 155°F.
LCV-112B/C VCT Outlet Auto Close
- VCT lo-lo of 2% on both LT-112 and LT-185
- SI
FCV-121 Alarms
-Lo Flow Alarm ≤ 55 gpm
-Hi Flow Alarm ≥ 150 gpm
-Min flow in auto is 55 gpm
8145 Aux Spray should not be used when…
ΔT exceeds 320°F between charging out of Regen Hx and PZR temp
VCT Level Control (Level Channel 112) makeup start and stop setpoint
-Makeup starts 46%
-Stops at 56%
(10% equates to 200 gal)
What occurs when you raise/lower Letdown outlet temperature?
-Raise T: negative reactivity due to releasing boron
-Lower T: positive reactivity due to absorbing B in mixed beds
-Per SOP-103, when placing a standby bed in service, special care should be taken not to add positive reactivity due to absorption of B in the bed
RCS Limits on Letdown Flow (per # of demins)
-≥500°F in RCS, limit letdown flow to 140 gpm
-<500°F w/1 demin in service, limit flow to 170 gpm
-<500°F w/2 demins in service limit flow to 195 gpm
Do Hagen controllers work automatically?
No.
