Failures -- No, not you Flashcards
How does MPC-253 failing High affect Rod Control?
Power rate of change and Tavg < Tref causes rods to step out
How does MPC-253 failing Low affect Rod Control?
Power rate of change and Tavg > Tref cause rods to step in
How does a PR NI failing High affect Rod Control?
Power Rate of change steps rods in (until C-2)
How does PR NI failing Low affect Rod Control?
No effect
It switches to a diff channel
How does Tavg failing High affect Rod Control
Rods Step In
If the pressurizer level control CONTROL CHANNEL fails low, what happens?
QRV-251 throttles open to increase level
LD Isolates at QRV-112 and all orifices
PZR Htrs Off
Rx Trips at 92% (if > P7)
If the pressurizer level control CONTROL CHANNEL fails high, what happens?
QRV-251 throttles closed to lower level
PZR Htrs come on at +5% deviation
Actual Level decreases at 17% which causes orifice isolation valves close, heaters go off and QRV-111 closes
Actual Level Increases (min charging, no LD)
Rx Trip at 92% (if > P7)
If the pressurizer level control BISTABLE CHANNEL fails high, what happens?
NOTHING
If the pressurizer level control BISTABLE CHANNEL fails low, what happens?
LD Isolates at QRV-111
PZR Htrs Off
Pressurizer Pressure decreases (Htrs Off)
Actual Level increases, charging to min
Rx Trips at 92% (if > P-7)
If Pressurizer Pressure Control CONTROL Channel Fails High, what happens?
All Pzr Htrs Off
Spray full opens
1/2 signals for NRV-152 present
Actual Pzr Pressure lowers
If Pressurizer Pressure Control CONTROL Channel Fails Low, what happens?
BU and SCR Htrs On
Actual pressure Raises
NRV-152 is Inoperable
If channel 3, ALL PORVs inop
If Pressurizer Pressure Control BISTABLE Channel Fails High, what happens?
1/2 actuation signals present for NRV-151 and 153
If Pressurizer Pressure Control BISTABLE Channel Fails Low, what happens?
NRV-151 and 153 Inop
If channel 4, all PORVs Inop
If NPP-151fails, which CCP ELO is effected?
East
If NPP-153 fails, which CCP ELO is effected?
West
