RPS Scram Signals Flashcards
What is the Turbine Stop Valve Closure RPS trip setpoint?
1) 3 Turbine Stop Valves less than 95% open will produce a Reactor Scram 2) 2 Turbine Stop Valves less than 95% may produce a ½ Scram
What is required to bypass the Turbine Stop Valve Closure RPS trip signal?
Less than 38% Reactor Power
What is the basis for the Turbine Stop Valve Closure RPS trip signal?
1) Ensures MCPR Safety Limit is not exceeded on a Reactor Scram 2) This is the primary Scram after a Turbine Trip
What is the Turbine Control Valve Closure RPS trip setpoint?
Less than 530 psig Emergency Trip System(ETS) pressure
What is required to bypass the Turbine Control Valve Closure RPS Trips signal?
Less than 38% Reactor Power
What is the basis for the Turbine Control Valve Closure RPS trip signal?
1) Ensures MCPR Safety Limit is not exceeded on a Reactor Scram 2) This is the primary Scram after a Generator Load Reject
What is the Scram Discharge Volume High Level RPS trip setpoint?
Level greater than 67%
What is required to bypass the Scram Discharge Volume High Level RPS trip signal?
Mode Switch in REFUEL or SHUTDOWN with Instrument Volume High Scram Bypass switches in bypass
What is the basis for the Scram Discharge Volume High Level RPS trip signal?
Insufficient volume to accept displaced water, control rod insertion would be hindered
What is the MSIV Closure RPS trip setpoint?
1) 3 Main Steam Isolation Valves less than 92% open will produce a Reactor Scram 2) 2 Main Steam Isolation Valves less than 92% open may cause a ½ Scram
What is required to bypass the MSIV Closure RPS trip signal?
Mode Switch not in RUN
What is the basis for the MSIV Closure RPS trip signal?
1) Anticipation of a complete loss of the normal heat sink 2) Reduces the amount of energy required to be absorbed, and along with the actions of ECCS ensures fuel PCT less than or equal to 2200F
What is the High Drywell Pressure RPS trip setpoint?
1.68 psig in the Drywell
What is required to bypass the High Drywell Pressure RPS trip signal?
NEVER BYPASSED
What is the basis for the High Drywell Pressure RPS trip signal?
Minimize the possibility of fuel damage and to reduce the amount of energy being added to the coolant and the Drywell
What is are the APRM Neutron Monitoring RPS trip signals?
1) APRM Flux Setdown-15% 2) APRM Flux HI-118% 3) APRM Flow Thermal Power High-Greater than .628 x Recirc Flow + 61% clamped at 111% 4) APRM INOP
What is the basis for the APRM Flux Setdown RPS trip signal?
Nothing specific in the Safety Analysis
What is the basis for the APRM Flux Hi RPS trip signal?
Terminates the Main Steam Isolation Valve closure event and, along with Safety Relief Valves limits Reactor Pressure to less than the ASME code limits
What is the basis for the APRM Flow Thermal Power RPS Trip signal?
Provides protection against transients where thermal power increases slowly (such as the
loss of feedwater heating event) and protects the fuel cladding integrity by ensuring that the MCPR Safety Limit is not exceeded
What is required to bypass the APRM Flux Setdown RPS trig signal?
Mode Switch in RUN
What is required to bypass the APRM Flux High and APRM Flow Thermal Power High RPS trig signals?
Mode Switch NOT in RUN
What three OPRM monitoring functions produce RPS trip signals?
Period, Growth, and Amplitude
What is the basis for the OPRM RPS trip signals?
Provides protection from exceeding MCPR Safety Limit
What are the IRM Neutron Monitoring RPS trip signals?
1) 120/125 2) IRM INOP
