Term
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Definition
Provides a reliable and regulated source of power.
A reliable and reulated backup source of power.
Allows continued use of controls, safety devices and indications. |
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Term
| Design Basis: safety related |
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Definition
Safety related:
1) continuously supply voltage to equipment needed to shut down the reactor safely and remove reactor decay heat.
2) there can be no variation of voltage or frequency that could damage fuel or reactor coolant pressure boundary
3) physical separation
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Term
| Design Bases: non-safety related |
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Definition
Non-safety related:
1) continuous volatage regulated electrical supply
2) supplied with 2 separate power inputs, which may be interrupted if offsite power is lost.
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Term
Name the 4 vital instrument buses
and their power supplies: |
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Definition
A, B, C and D
D is fed from B |
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Term
| Name the VIB inverter components and their function: |
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Definition
1) rectifier takes 230V input and rectifies it to 140V DC
2) auctioneering circuit identifies 2 DC sources and passes the high source
3) inverter inverts DC input to AC voltage
4) AC regulator regulates AC inputs
5) static switch looks at normal source vs. alternate source and swaps to alternate source upon loss of normal source
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Term
| Which lights are typically lit on the rectifier section under normal operating conditions? |
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Definition
DC input on
DC bus available
DC input available
AC output available
Inverter AC available
Normal AC input available
They are all red. |
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Term
| Which meters are on the front of the rectifier section? |
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Definition
Recitifer DC output
DC bus
DC input |
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Term
| DC input breaker CB101 Power to inverter from static rectifier cabinet auctioneered DC bus trips. Why? |
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Definition
Trips on low input voltage sensed on the auctioneer bus.
Charge on toggle switch must be turned on prior to CB101 closure. |
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Term
| What does the sync monitor light indicate? |
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Definition
Monitor's phase sync between interverter and alternate source.
1) Off = inphase
2) Half brilliance = 90 out
3) Full brilliance = 180 out |
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Term
Describe manual transfer from normal to
alternate power source. |
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Definition
| Test transfer switch must be placed to alternate to swap the static switch 1st. |
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Term
RMS inverters are identical to Vital Bus inverters,
except for: |
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Definition
Normal and alternate power come from the same breaker
DC backup power is from an internal battery -
last 2 minutes
A and B RMS panels can be fed from C,
but only during modes 5 and 6
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Term
| What are the locations of the RMS inverters? |
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Definition
Only unit 2
A RMS is on 84 switch gear
B and C are on 64 switch gear |
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Term
| What is the purpose of the 21 and 22 MAC Panels? |
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Definition
| Supply loads that are not safety related, but are important to safe operation of the plant |
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Term
| 21 and 22 MAC Panels are identical to the vital bus inverters except for: |
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Definition
1 AC line regulator provides alternate source
for both 21 and 22
The normal and backup power supplies are common to both 21 and 22.
The normal and alternate power supply is from C to 230V and the backup power supply is C 125V
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Term
Incore Instrumentation Distribution
is fed from what buses? |
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Definition
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Term
Emergency Lighting Inverters
are supplied by what voltages?
and output what voltages? |
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Definition
Back up 125VDC
Normal 120VAC
Outputs only 120VAC |
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Term
State the purpose of the ASDS.
State the Loads asociated with ASDS
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Definition
Alternate Shutdown Distribution System provides selected instrumentation remote power and control if there is a fire in the 100' Relay or Main Control Rooms.
Supplies 15 instrument loops 10 of which are 1600 series and are always supplied by ASDS.
Loads: 2 S/G Narrow Range Level, 2 S/G Pressure, PZR Pressure and Level, 1600 Series.
Operator swap capable: Gamma Metrics, UHF Radio repeater, Wide Range Thot and Tcold |
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