Reactor Core Isolation Cooling (RCIC) Flashcards
What happens to RCIC on a loss of DIV 1 DC
Loss of initiation logic
What happens in the RCIC system when the Manual Isolation Push Button is pressed?
MOV121 will shut if initiation signal is present.
What are the RCIC turbine direct trips and what valves close?
- Closes MOV150, 143, 126
- Trips
- High exhaust pressure (50#)
- Pump suction low @ 20” Hg (3.5 sec)
- Overspeed @ 118.7%
- local trip lever
What happens to RCIC trip throttle valve MOV150 on a LOCA signal?
- divorced from the DIV 1 bus on a LOCA signal and must be reset locally if tripped
What happens to RCIC on a loss of its pressure transmitter?
Loss of min flow valve
What directs what on the RCIC controller?
Manual is speed control
Auto is flow control
What powers the RCIC flow controller/governor control valve MOV151?
UPS2A
What initiates RCIC?
L2 ONLY!!!
What valves close at L8?
MOV120 closes
tells MOV126 to close
tells MOV143 to close
Ramp Generator resets
What in RCIC causes the Main Turbine to Trip?
- Initiation (L2)
- MOV126 not closed
- 4 min TD
What closes MOV126
MOV150 closed
OR
MOV120 closed for 10sec
What happens with a failure of the RAMP Generator?
RCIC Turbine operates at 1000 rpm with NO INJECTION
When does MOV136 Supp Pool suction valve open
CST <145.5” (10sec) AND 108/124 closed
When does MOV143 min flow valve open
> 140psig and <110gpm
When does MOV143 min flow valve close
> 220gpm OR
MOV150 closes OR
MOV120 closes
What happens in the Ramp Generator fails high.
Overspeed Trip
When and how does the manual isolation work?
- Only during an Initiation Signal
- Only closes MOV121, outboard isolation valve
What are the Div 1 Group 10 isolation valve(s)
MOV121
What are the DIV 2 Group 10 isolation valves?
MOV170, 128
How many transmitters are required to isolate RCIC?
2
What flow requires speed control (Man)
<400gpm (on speed control stay >1500rpm)
What RPM shall be maintained when in speed control?
> 1500rpm
When must RCIC be operable during a S/U?
Prior to 150psig in the RPV
When does MOV129 Open?
RCIC initiation
When does MOV129 close?
When MOV136 is FULL Open
When does MOV126 Open?
- RCIC initiation (6.5 sec)
- MOV120 NOT closed (10 sec)
- MOV150 NOT closed
When does MOV126 close?
- MOV150 closed
OR - MOV120 closed (10 sec)
What happens if the RAMP generator fails to energize?
RCIC will be at 700-1000 RPM
What are the RCIC Group 10 isolations?
- RCIC Steam Supply Low Pressure - 75psia
- RCIC Turbine Exhaust Diaphragm Pressure High - 5psig
- Rx Bldg Gen Area High Temp - 130.2F
- High Temp (RCIC Equip Area, RCIC Pipe Chase, Rx Bldg Pipe Chase, RHR Pump Room) - 135F
- RCIC Steam Line Flow High - 165.9” H2O OR <-275” H2O.
- RHR/RCIC Steam Flow High - 36.2” H2O OR <-275” H2O.
What are the RCIC Group 11 isolations?
- RCIC Steam Supply Low Pressure - 75psia
AND - High DW - 1.68#
AND - ~70 sec time delay
When does RCIC injection occur?
When discharge pressure is 110psig greater than Rx pressure.
How is ICS turbine casing and exhaust piping protected against overpressure?
Dual rupture disc. Each rupture disc blows at 150 psid
What is the Power Supply for all MOVs in RCIC except PCIVs?
DIV I DC
