Term
| Emergency Diesel Generators Purpose |
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Definition
3 independent EDGs are used to supply emergency onsite AC power
a) each supplies a 4KV bus
b) each is a self-sufficient power source
c) each is sized to handle shutdown and safety systems
d) 2 EDGs are required to supply minimum eletrical loads |
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Term
| Diesel Generator Ratings: |
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Definition
2600 KW = continuous
2750 KW = 2000 hours
2860 KW = 2 hours
3100 KW = 1/2 hour |
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Term
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Definition
A) Supplies power to protect fuel design limits and RCS boundary design
B) ensure the core is cooled and vital functions maintained
C) 2 EDGs supply power for a LOCA with a LOOP.
D) Safe shutdown of the unit. |
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Term
| What is the capacity of the EGD lube oil system? |
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Definition
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Term
What is the minimum jacket water pressure and
minimum RPM for diesel start? |
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Definition
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Term
| At what pressure does the low oil pressure alarm actuate? |
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Definition
Less than 60 PSIG
No trip. Alarm only.
Less than 40 PSIG engine shutdown - no matter what SEC mode. |
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Term
| At what pressure does the lube oil system relief back to the sump? |
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Definition
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Term
| At what temperature is the lube oil maintained and describe any alarms associated. |
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Definition
Maintains 180 degrees
Alarms at 190 degrees
High temp trip at 205 degrees (non-emergency trip only) |
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Term
What is the purpose of the EDG Prelube Pump?
When does the prelube pump start and stop? |
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Definition
To lubricate the EDGs moving parts for ease of start.
Prelube pump starts on <18 PSI jacket water.
Stops on engine start. |
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Term
| What chemical is no longer used in the jacket water system? |
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Definition
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Term
| A jacket water pressure of 18 PSI provides a control signal for |
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Definition
Prelube pump
Air start
Turbo boost air
Field flash
Crank case exhauster |
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Term
| The DFOST system is sufficient to permit how many diesels in mode 3 for how many days? |
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Definition
| 2 diesels, 4.5 days if each tank is at 23,000 gallons |
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Term
| What are the levels of operation for the diesel day tanks? |
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Definition
Starts on less than 33" in any day tank
Stops on 43" all day tanks
The backup pump starts on less than 27" |
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Term
| What's the purpose of the starting air system? |
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Definition
| Supplies compressed air to starting motors and booster rack to bring DG up to firing speed. |
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Term
| How many air receivers does each diesel have? |
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Definition
| 2 receivers each sized to permit 3 cold starts at 160 PSI |
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Term
| How many air start motors does each DG have? |
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Definition
2 per train
Each train has 3 second motor & 10 second motor
Any set capapable of starting the DG in 10 seconds
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Term
| Initial excitation "field flash" is started by the K1C relay via 125 VDC when: |
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Definition
JW pressure greater than 18 PSI or speed is greater than 200 RPM
Field flash is removed at 95% of rated voltage |
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Term
| State the purpose of the RMAS Switch |
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Definition
This interlock ensures EDG is operating in automatic
NOTE: Transfer from auto to manual is NOT a bumpless transfer |
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Term
| State the 2 operations of the voltage regulator and their purposes: |
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Definition
Manual (Droop) used when operated in parallel with OSP.
Automatic (Isochronous) used when operated on an isolated bus. |
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Term
| Purpose of diesel area ventilation |
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Definition
Maintains temperature of EDG room and control areas between a maximum of 120F and minimum of 60F.
Also cuts down on diesel oil fumes |
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Term
| Name the Support Systems for the EDG and their Purposes... |
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Definition
Lube Oil System:
Circulates, cools, and Filters Lube Oil for the Engine.
Jacket Cooling Water System:
Controls operating temperature of EDG by removing heat mainly from cylinder block and heads. Also through an aftercooler heater regulates temps between 110F - 120F to increase first try starting capability.
Fuel Oil System:
Delivers Fuel Oil from Bulk Storage Tank to 2- 30000 FOSTs shared by 3 EDGs, to 3-550g Day tanks for continuous operation of 2 EDGs for 4.5 Days
Starting Air System:
Cranks EDG until combustion takes place.
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