Term
| What signals auto start the EDG and where are these signals generated from? |
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Definition
Level 1 and Hi DW pressure come from core spray logic.
One division of logic is enough to start all 4 EDGs.
Under voltage will also start the EDGs.
The signals come from the ESF and EDG 4160V busses.
480V busses have UV schemes but do not start the EDGs. |
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Term
| Which signals determine that the EDG is operating in the ‘Emergency Mode’? |
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Definition
| LOCA Signal (L1 or High DW Pressure from CS Logic). |
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Term
| Why do the 6 and 9 breaker positions input into EDG “Emergency Mode” the circuit? |
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Definition
| The Undervoltage/Load Shed string will reset when the bus is reenergized by the EDG so in order to keep the EDG in the emergency mode these are inputs to the start cicuit. |
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Term
| What does the Emergency Signal Bypass Switch do? Why is it needed and when would it be used? |
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Definition
| Only bypasses the the LOCA signal. If DW pressure was higher that the setpoint and we wanted to shut off the EDGs. |
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Term
| Describe the indications in the Control Room for a 4160V ESF bus lockout. |
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Definition
| All source breakers open 6, 8 , and 9 breakers tripped. |
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Term
| During an ESF bus lockout, how does the EDG respond? Explain. |
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Definition
| The EDG would not start since the bus lockout relay is interlocked in the EDG start circuit so the EDG does not start during a ESF bus lockout. |
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Term
| What is the status (TS wise) of the EDG when operating in parallel with offsite power? Why? |
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Definition
| The EDG is INOPERABLE. Underfrequency relay is not tech spec |
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Term
| How would the EDG respond to a loss of offsite power when operating in parallel with offsite power? |
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Definition
| The EDG would remain tied to the buss initially. As the EDG tried to pick up load the under frequency relay (which is enabled with the 3 and 6 breakers closed) would open the EDG output breaker. This would unbypass the UV relays and allow normal load shedding to occur. |
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Term
| What signals enable/initiate EDG load sequencing? |
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Definition
| EDG emergency start signals enable the load sequencer and the EGD output breaker closing initiates the sequencer. |
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Term
| Which ESF 480V bus undervoltage scheme is different from the rest and why? |
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Definition
| The 72C bus UV relays remain active even though the EDG 12 output breaker is closed. This is to ensure the an UV trip on the 72C bus will initiate a transfer of 72CF. Otherwise 72CF would be inoperable every time EDG 12 is tested. |
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Term
| What does the EDG Diff trip measure? |
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Definition
| Current within the generator phases as compared to current after the output breaker. |
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Term
| Which alarms are non-essential trips? |
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Definition
Generator field
Generator ground
Generator over voltage
<4 inches Jacket level
>195 deg jacket temp
<8 psi jacket pressure
<7psi fuel oil pressure
>225 deg lube oil temperature |
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Term
| Why does the Generator Trouble alarm come in on every EDG automatic load sequence? |
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Definition
| This alarm is brought in by Field failure or Generator Bearing high temp. On each EDG start the power to the Generator Bearing temp monitor is lost for a short time during sequencing. This brings in the alarm. When power is restored the alarm must be acknowledged locally to clear the control room alarm. |
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Term
| What causes the EDG not ready for auto start alarm? |
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Definition
| Mode Control Switch in - Maint Pull Out |
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Term
| During EDG surveillances, at what times will the EDG not perform its function automatically and will require operator action to restore? |
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Definition
| Mode Control Switch in - Maint Pull Out |
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Term
| What causes the EDG not in auto alarm? |
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Definition
| Any Aux equipment disconnect switch out of position. |
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Term
| The EDGs start automatically upon receipt of LOCA and/or LOOP signal and reach rated speed and voltage within _______________ |
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Definition
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Term
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Definition
| 3,967HP at 900 rpm, driving a 4160VAC, |
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Term
| Normal feed breaker is the "no. ______" breaker. Power is fed to the EDG bus via the "no.________" breaker. |
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Definition
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Term
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Definition
| - 12 cylinder, opposed piston, dual crankshaft connected by a vertical drive (bevel gear). The crankshafts rotate in opposite directions. The lower crankshaft leads the upper by 18o. The lower crankshaft delivers power to the generator through the crankshaft coupling. A timing chain drives 2 camshafts from the upper crankshaft. The camshafts determine the timing of fuel injection |
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Term
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Definition
| Continuous: 2,850kW • 2,000 hr: 3,100kW • 300 hr: 3,250kW 30 min 3,500KW |
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Term
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Definition
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Term
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Definition
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Term
| Speed that EDG flashes field |
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Definition
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Term
| Tech Spec Fuel oil storage tank 7 day |
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Definition
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Term
| Tech Spec Fuel oil storage tank 6 day |
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Definition
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Term
| Fuel oil storage tank capacity |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Storage tank transfer pump day tank (overflow) Engine driven pump(standby pump) duplex filter fuel injectors(overflow line) |
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Term
| EDG standby oil pump auto start |
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Definition
| EDG standby pump starts at 10# lowering and RPM >250 |
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Term
| DGSW pump serves which systems |
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Definition
Jacket coolant
Lube oil
Air coolant |
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Term
| How is DGSW normal flow rate set |
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Definition
| throttle valve at inlet of cooler |
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Term
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Definition
1 cross-tie per division. Can x-tie diesels in the same division.
1 Div of DGSW can only cool 1 EDG at a time! |
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Term
| DGSW standby pump Auto start |
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Definition
| >250 rpm 14 sec time delay |
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Term
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Definition
| RHR reservoir DGSW pump Air coolant Lube oil Jacket coolant Cooling towers |
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Term
| EDG jacket cooler high temp alarm |
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Definition
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Term
| EDG jacket cooler low press |
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Definition
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Term
| EDG jacket coolant expansion tank level trip |
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Definition
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Term
| EDG Low lube oil press trip |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| For 2 minutes prior to manual start. |
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Term
| How is prelube provided during autostart? |
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Definition
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Term
| Lube Oil tank level Hi/low? |
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Definition
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Term
| Purpose of air start system. |
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Definition
| Air to start EDG For the Air Coolant TCV (F023A-D). For the main bearing oil boosters. For the governor actuator booster (on EDG start). |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Generator Field Failure - contact closes on loss of generator field. A manual exciter trip could cause this. Generator Overvoltage closes on overvoltage. Generator Ground Fault - active only when the generator is paralleled. Fuel Oil Pressure Low Jacket Coolant Level Low Jacket Coolant Pressure Low Jacket Coolant Temperature High Oil Temperature High |
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Term
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Definition
CLOGS
Crankcase Pressure High (0.5”water)
Lube Oil Pressure Low (23 psig)
Overspeed (1035 to 1053 rpm)
Generator Differential
Start Failure (within 7 seconds reach either 250 rpm, 810 rpm or sufficient jacket coolant supply pressure). |
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Term
| EDG Crankcase Pressure High |
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Definition
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Term
| EDG Lube Oil Pressure Low |
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Definition
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Term
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Definition
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Term
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Definition
| (within 7 seconds reach either 250 rpm, 810 rpm or sufficient jacket coolant supply pressure). |
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Term
| How does the EDG respond if, following the LOCA, a Loss of Offsite Power (LOP), subsequently occurs? |
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Definition
| The EDGs start automatically upon receipt of LOCA and/or LOP signal and reach rated speed and voltage within 10 seconds. However, the EDGs breakers will not automatically close to the plants electrical bus network unless either a LOP and/or loss of EDG bus voltage occurs. If a LOP and/or loss of EDG bus voltage occur an automatic sequencer will load the EDGs in an orderly manner to avoid overloading and damaging the equipment. Only the loads necessary for safe shutdown are automatically loaded to the EDG. |
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Term
Draw
Fuel Oil and Storage
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Definition
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Term
Draw
EDG jacket cooling system |
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Definition
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Term
| Draw EDG air cooler coolant |
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Definition
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Term
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Definition
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Term
EDG AIR INTAKE AND EXHAUST SYSTEM
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Definition
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Term
EDG AIR INTAKE AND EXHAUST SYSTEM
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Definition
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