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4.16KV (4KV)
BWR Systems
17
Other
Not Applicable
07/23/2012

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Cards

Term
4KV

Describe the windings on 2R and 1R.
Definition
-X windings supplies buses 11 and 12.
-Y windings supplies buses 13 and 14.
Term
4KV

Describe power supply to bus 17 & 18.
Definition
-Bus 17 normally from 1ARS transformer.
-Bus 18 normally from #6 transformer.
Term
4KV

Describe what powers buses 15 & 16.
Definition
-15 normally powered from 13 bus.
-Alternate supply from 1AR and 11 EDG.
-16 normally powered from 14 bus.
-Alternate supply from 1AR and 12 EDG.
Term
4KV

Describe bus control power.
Definition
-11,13,15 buses are div I (11 battery).
-12,14,16 are div II (12 battery).
-15,16 can be cross-connected.
-If 17 bus is energized then supplies both 17 and 18 bus control power.
-Loss of 17 bus transfers to 18 bus.
-ABT is normal seeking.
Term
4KV

Describe the 2R.
Definition
-Normal source for 4KV.
-Powered from 2RS.
-Control power is 480VAC (MCC-131/121 normal seeking).
-Sudden pressure rise in oil tank causes lockout and alarm
Term
4KV

Describe 1R.
Definition
-Backup power to buses 11-16.
-Fan cooled based on amps powered from MCC-121.
Term
4KV

Describe 1AR.
Definition
-Normal power from 10 bank.
-Alternate feed from 1ARS.
Term
4KV

Describe transformers 7 and 8.
Definition
-Powers discharge structure buses.
-Interlock prevents both breakers being closed based on B disconnects.
Term
4KV

Describe the automatic station power transfer.
Definition
-Break before make.
-Transfers from 2R to 1R but not back.
-No time delays.
-Caused by anything that secures power to 2R.
-First trips both recirc pump drive motors and both CW pump motor breakers.
-If a recirc MG drive motor breaker fails to trip open, the 1R source breaker to associated bus (11 or 12) will not close.
-Then 2R breakers open then 1R breakers close.
-Buses 11,13,&14 auto transfer to 1R when bus voltage is <25% normal voltage.
-Bus 12 does not normally transfer, but will transfer if bus 11 is locked out or #11RFP breaker is open and 12 bus voltage < 25% rated.
Term
4KV

Describe the loss of normal supply essential bus transfer.
Definition
-If both source breakers to a given bus open for > 5 seconds then the associated tie breaker trips and loss of voltage initiates.
Term
4KV

Describe loss of essential bus voltage transfer.
Definition
-Setpoint is 2625volts.
-4 sensing relays (1 out of 2 twice).
-Loss of voltage sensed then:
-Degraded bus voltage is disabled.
-5 second time delay and 10 second time delay initiated.
-Associated EDG starts immediately.
-After 5 seconds the bus tie breaker trips and transfer to 1AR.
-If 10 seconds pass w/out voltage then tie breaker trips and 1AR trips and transfer to associated EDG.
Term
4KV

Describe the degraded essential bus voltage transfer.
Definition
-3 sensing relays (2 of 3).
-Setpoint 3920volts.
-Sense for 9 seconds then tie breaker trips and transfer to 1AR and associated EDG starts.
-If now that on 1AR and still sees degraded voltage for 5 more seconds then 1AR breaker trips and transfer to the EDG.
Term
4KV

Describe load shed for the essential bus transfer.
Definition
-Shed of all essential bus loads except the associated 480VAC load center.
-Shed of all non essential MCCs.
-Trip of associated tie breaker.
Term
4KV

Describe in detail the load shed on essential bus transfer.
Definition
Division I/II
-11,13/12,14 RHR pumps.
-11/12 core spray pumps.
-11/12 CRD pumps.
-11,13/12,14 RHRSW pumps.
-MCC-131,132/141,142B.
-LC-103 tie to 104/ LC-104 tie to 103.
-Turbine aux oil pump (div I)
Term
4KV

Describe normal ECCS load shedding.
Definition
If 2R or 1R supplying:
-Drywell cooling recirc fans.
-RHRSW pumps.
Term
4KV

Describe ECCS load shedding if on 1AR or EDG.
Definition
-11/12 CRD pump.
-11,13/12,14 RHRSW pumps.
-VRF-1,3/2,4 drywell cooling fans.
-11/12 fuel pool cooling pumps.
-11/12 RBCCW pumps.
-12 service water pump (div II).
Term
4KV

Describe ASDS transfer load shedding.
Definition
-12,14 RHR pumps.
-12,14 RHRSW pumps.
-12 CRD pump.
-12 core spray pump.
-MCC-141,142B.
-LC-104 tie to LC-103.
(Same as Div II ECCS shed).
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