EDG's

Question 1

“LCO 3.8.3 - EDG’s auxiliaries” requirements

Answer 1

Stored fuel oil, lube oil, and starting air within limits, and both fuel oil transfer systems operable

Question 2

“LCO 3.3.5 - EDG’s undervoltage start” requirements

Answer 2

3 channels of Loss of Voltage Function and 3 channels of Degraded Voltage Function and associated logic channels for each EDG shall be operable

Question 3

EDG operability

Answer 3

Jacket Water and Lube Oil >90F
Lube Oil <205F
Air Start Pressure >95# but <175#
Starting Air Tank Pressure >215#
Service Water available
Generator/Engine protective relays in service
Over speed is latched
Output Breaker is racked in with control power available
In UNIT (not in PARALLEL)
Voltage Regulator in AUTO
Crankcase covers installed
EDG Room ventilation
Outside Air <85F one fan in-service
Outside Air >85F two fans in-service

Question 4

EDG trips

Answer 4

Overspeed - 1060-1105 rpm
Overcrank - 10 sec, 10 psi jacket water, 120 rpm
Overcurrent - 824 amps
Low lube oil pressure - 40 psi
Low jacket water pressure - 10 psi for 45 sec
Generator differential

Question 5

EDG breaker trips

Answer 5

Engine trp
Overcurrent - 824 amps
Generator differential
Safeguards fualt
Loss of excitation
Turbine trip with EDG on the bus

Question 6

Parameters to manually trip the EDG

Answer 6

Jacket water > 195 F

Lube oil > 205 F

Question 7

EDG Generator load ratings

Answer 7

2500 kw continuous

2750 kw for 2 hours

Question 8

EDG generator loading rates

Answer 8

50 kw initial load

500 kw increments with 5 minute hold time

Question 9

“LCO 3.8.3 - EDG’s auxiliaries” applicability

Answer 9

All modes, when associated EDG is required to be operable

Question 10

“LCO 3.3.5 - EDG’s undervoltage start” applicability

Answer 10

All modes, when associated EDG is required to be operable

Question 11

What is the required action if 1 or more loss of voltage or degraded voltage functions per EDG is inoperable?

Answer 11

IMMEDIATELY declare EDG inoperable

Question 12

Why is EDG load only reduced to 50 kw prior to opening the output breaker?

Answer 12

To ensure the EDG is not motoring

Question 13

What are the power supplies for P-18A/B?

Answer 13

P-18A - MCC 8

P-18B - MCC 1

Question 14

What are the power supplies for EDG control power?

Answer 14

D/G 1-1 - D-11A

D/G 1-2 - D-21A

Question 15

What are the power supplies for the EDG air start compressors?

Answer 15

G1-1 (D/G 1-1) - MCC 1

G1-2 (D/G 1-2) - MCC 2