Term
UPS
Describe the power to Y21. |
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Definition
-Normally from MCC-143.
-Emergency from MCC-133.
-Power selecter is power seeking. |
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Term
UPS
Describe what happens on a loss of Y20. |
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Definition
-11/12 MG scoop tube lock.
-Loss all 4 ECCS sump pumps.
-Feed water heater dumps/spills fail open.
-Vacuum breaker lights out.
-Lose APRMs.
-Recombiner outlet closes so vacuum degrades.
-RHR min flows fail open. |
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Term
UPS
Describe power at Y91. |
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Definition
-Normally powered from LC-108 converted to DC to 17 battery, converted back to AC to computers.
-Alternate is from LC-107.
-Backup is from 17 battery.
-Static switch is make before break.
-Static switch is normal seeking. |
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Term
UPS
Describe what causes the Y91 static switch to transfer load. |
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Definition
-Y91 O/P overvoltage > 537V.
-Y91 O/P undervoltage < 423 for 10 secs.
-Y91 overload > 103% O/P current.
-Faults.
-Static switch energizes, power breaker opens, new power breaker shuts, static switch deenergizes. |
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Term
UPS
Describe Y91 load shed. |
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Definition
-If power is supplied by 17 battery then the 3 process computer loads will be shed after 30 minutes.
-Allows other loads to be supplied for additional 60 minutes. |
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Term
UPS
Describe power to Y71 and operation of the static switch. |
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Definition
-Normally powered by 13 battery.
-Alternate source by 15/11EDG/1AR bus through LC-103 to MCC-134.
-Then powers Y10 and Y70.
-Static switch is a fast break before make.
-Normal seeking.
-Does not auto transfer back if shifted manually.
-Will not shift if not in sync or alternate power not available. |
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Term
UPS
Describe power to Y81 and operation of the static switch. |
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Definition
-Normally powered by 16 battery.
-Alternate source by 156/12EDG/1AR bus through LC-104 to MCC-144.
-Then powers Y30 and Y80.
-Static switch is a fast break before make.
-Normal seeking.
-Does not auto transfer back if shifted manually.
-Will not shift if not in sync or alternate power not available. |
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Term
UPS
Describe faults causing Y71/81 to auto shift. |
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Definition
-Inverter DC I/P blown fuse.
-Inverter low I/P voltage < or equal to 210VDC (alarm at 220, shutdown at 200).
-Inverter O/P undervoltage <108VAC.
-Inverter O/P overvoltage >132VAC.
-Inverter overload: O/P > 343 amps or O/P undervoltage <108VAC. |
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Term
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Definition
-For Y81/71.
-If overload condition and alternate power not available starts zip mode.
-Inverter rapid s/d.
-Powers up to 312amps (150%) FOR 30 SECONDS.
-If fault clears then return to normal.
-If doesn't clear then inverter lowers to 260amps (125%) and 114 volts. |
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Term
UPS
Describe what happens on a loss of Y10. |
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Definition
-No full core display.
-No rod select matrix.
-RWCU trip (HI temp / MO-2399 closes).
-No A side IRM/APRMs.
-Cannot move rods.
-Have to bypass OG storage.
-SJAE rad monitors.
-Fire panel C-300.
-Loss of HWC system.
-1 power supply DFCS.
-1 power supply lo lo set. |
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Term
UPS
Describe what happens on a losss of Y70. |
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Definition
-Lose inboard MSIC AC light.
-A spotmos lost/ alarm.
-RCIC flow controller out.
-RWCU inboard and recirc Sx inboard close.
-Steam chase temp goes up.
-No Group 2 reset.
-RWM lost / rod block.
-Need to take manual control of RHRSW.
-Secondary containment isolation.
-EFT high rad mode. |
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Term
UPS
Describe what happens on a loss of Y80. |
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Definition
-Lose outboard MSIV AC light.
-B spotmos lost / alarm.
-HPCI flow controller out.
-RWCU-2398 closes.
-SBGT starts (gr II iso).
-ASDS panel power. |
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Term
UPS
Describe what happens on a loss of Y30. |
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Definition
-EPR lost must use MPR.
-Rx pressure increase.
-FRVs lock.
-CRD flow control fail open.
-Lose vacuum indication.
-SJAE supplies fail open.
-RWCU hi temp trip inop. |
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