P-4
Reactor Trip
Both Reactor Trip and bypass breaker open
•Turbine Trip
•FWIS if low TAVG (564°F)
•Blocks automatic SIS
•Arms steam dumps
•Allows reset of SIS @ 60 seconds
P-6
Source Range trip block
1/2 IR > 10-10 amps
Allows blocking the SR high flux trip
P-7
Low power trip block
P-10 or P-13 > 10% power
Enables the following Reactor Trips:
•Low PZR Pressure
•High PZR Water Level
•RCS loop low flow (2 loops)
•RCP Bus Undervoltage
•RCP Bus Underfrequency
P-8
Single RCS low flow block
2/4 PR < 48% power
No Reactor Trip on Single RCS low flow
P-9
Turbine Low Power
2/4 PR > 49% power
Enables Reactor Trip on turbine trip
P-10
Nuclear at-power
2/4 PR > 10% power
Allows blocking of:
•IR high Reactor trip (25%)
•PR low setpoint Reactor Trip (25%)
•C-1 rod stop (20%)
P-11
Pressurizer low pressure
2/3 PZR Pressure < 1970#
Allows blocking of low PZR pressure SIS
Allows blocking of low MS pressure SIS
•Toggles MSIS to rate setpoint
P-12
Lo-Lo TAVG
2/4 TAVG < 550°F
Closes all Steam Dumps
P-13
Turbine at-power
Turbine >10% power
Feeds P-7
P-14
Hi-Hi SG level
2/4 SG level > 78%
Turbine trip, Trips both MFPs & FWIS