Term
RPS Power
Describe the purpose and function of RPS power. |
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Definition
-Supply a continuous, reliable source of 12Vac power to:
-RPS system.
-RPS Analog trip cabinets.
-Power Range Neutron monitoring.
-Off-gas and main steam line rad monitoring. |
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Term
RPS Power
Describe the design basis for RPS power. |
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Definition
-Designed to provide a continued reliable output of 120Vac power free of transients.
-Switching transients and momentary losses of input power will not cause substantial changes in output voltage or frequency. |
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Term
RPS Power
Describe the purpose of the MG set flywheels. |
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Definition
-Provides energy to maintain Gen output during momentary faults that don't impair Rx operation for approx. 2 seconds.
-Voltage and frequency will not drop more than 5%, and recovery will happen within 5 seconds. |
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Term
RPS Power
Describe what is powered by Y-50 (through MCC-111) as it pertains to RPS. |
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Definition
-'A' SCRAM logic RPS.
-'A' SCRAM solenoids pilot valves.
-'A' primary CTMT isolation.
-'A' PRNM, Voters 1&3, and 'A' RBM.
-Rx low water level trip RPS cabinets (a/c).
-'A' process rad monitors, main steam a/c, Rx bldg Exh plenum 'A', Fuel pool monitor 'A', CR, Intake. |
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Term
RPS Power
Describe what Y-40 (through MCC-141) powers as it pertains to RPS. |
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Definition
-Rx low water level trip RPS cabinets (b/d).
-'B' process Rad monitors, main steam B/D, Fuel pool monitor 'B', Rx bldg exh monitor 'B'.
-'B' PRNM, voters 2&4, and 'B' RBM.
-'B' SCRAM logic RPS.
-'B' SCRAM solenoid pilot valves.
-'B' primary CTMT isolation. |
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Term
RPS Power
Describe the alternate power source to RPS. |
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Definition
-Y-60 through MCC-111
-Loss of poweer to Bus 16 both Y-50 and Y-40 will be powered through MCC-111 (Y-60).
-Contains mechanical interlock allowing powering only 1 side at a time. |
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Term
RPS Power
Describe the EPA breaker trips. |
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Definition
-Overvoltage: (126-126.8V) (< or equal to 128V for tech specs)
-Undervoltage: (105.2-106V) (> or equal to 104V for tech specs)
-Underfrequency: (57.4-57.8Hz) (> or equal to 57Hz for tech specs).
-All have a time delay: (2.4-2.6 seconds) (< or equal to 4 seconds for tech specs). |
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Term
RPS Power
Describe the effects of a loss of Y-40 or Y-50 on RPS. |
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Definition
-Loss of Y-50 would result in a half scram on its respective RPS channel.
-Loss of Y-40 would result in a half SCRAM on its respective RPS channel. |
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Term
RPS Power
Describe what would cause a REAC BLDG VENT & F P RAD CHA A-HI/LO annunciator to actuate. |
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Definition
-Rx bldg exhaust plenum:
-26.0 mrem/hr HI TRIP.
-0.01 mrem/hr LO TRIP.
-Fuel Pool:
-50.0 mrem/hr HI TRIP.
-0.1 mrem/hr LO TRIP. |
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Term
RPS Power
Describe what will cause the REACTOR AUTO SCRAM CHANNEL A annunciator to actuate. |
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Definition
| -SCRAM signal present on RPS Channel A1 or A2 (same for 'B' Channel). |
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Term
RPS Power
Describe the power requirements for resetting SCRAM and group isolation logic. |
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Definition
-Both divisions of RPS power supplies are required to reset the SCRAM.
-The relays whose contacts bypass the SCRAM discharge volume high level scram contacts in each division are powered from both RPS divisions.
-Group isolation logic can be reset with one RPS division. |
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