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systems. > diesels. > Flashcards

diesels. Flashcards

1
Q

what is the capacity of the fuel oil storage tanks?

A

two tanks containing 26,500 gallons each.

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2
Q

how long can the EDGs operate to supply power?

A

seven days.

4200KW requires 50,000 gallons of fuel over seven days.

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3
Q

what is the diesel rated for?

A
  • 4430KW
  • 0.8pf
  • 5538KVA
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4
Q

how long can the EDGs be operated at 110% overload? (4873KW)

A

2 out of 24 consecutive hours.

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5
Q

how long can the EDGs be operated at 120% overload? (5316KW)

A

30 minutes (without special inspection).

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6
Q

what are the auto start signals for the diesels?

A
  • LOP
  • degraded voltage
  • LOCA
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7
Q

what are the signals for a LOP auto start?

A

both incoming feeder voltages <92% AND
bus voltage <70%

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8
Q

what is the condition the causes a degraded voltage auto start?

A

both incoming feeders <92% for 20 seconds.

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9
Q

what are the signals that cause a LOCA auto start?

A

core spray logic
RPV level -129” (level 1)
OR
drywell pressure 1.68#
OR
manual core spray initiation.

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10
Q

what causes the regular lockout (86R)?

A
  • generator differential overcurrent
  • low lube oil pressure
  • overspeed (engine)
  • bus differential overcurrent
  • emergency stop pushbutton (140 sec lockout, then engine reset, then 86R).
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11
Q

what causes the backup lockout (86B)?

A
  • generator phase differential overcurrent
  • generator phase overcurrent.
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12
Q

what causes the test lockout?

A
  • reverse power
  • bus overcurrent
  • low field current
  • overexcitation
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13
Q

what occurs at 0 RPM upon EDG start?

A
  • cranking cycle timer initiate
  • SACS cooling water valves open
  • low air start pressure alarms lockout
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14
Q

what occurs at 95 RPM upon EDG start?

A

starting air shutoff.

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15
Q

what occurs at >365 RPM upon EDG start?

A
  • starting air shutoff
  • field flash (again)
  • low lube oil pressure trip enabled (indication after 7 second time delay
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16
Q

when is the EDG ready to load permissive?

A

> 3950VAC and >57Hz.

17
Q

what happens at >125RPM upon EDG start?

A
  • starting air shutoff (again)
  • D/G room recirc fan armed
  • “diesel running not loaded’ light energized
  • engine run timer starts
  • jacket water & LO high temp alarms disabled
  • motor driven fuel oil pump armed
  • motor driven rocker arm prelube pump armed
  • LO keep warm heater shutdown
  • JW keep warm pumps & heaters shutdown
  • generator space heater shutdown
  • exciter field flash circuit activated
  • low starting air pressure alarm reactivated
    -cranking timers reenergized
18
Q

what does 125VDC provide for the EDGs?

A

125VDC provides control power for the air solenoids to start the diesel.

without 125VDC, the diesel will not start.

19
Q

what are the EDG recirc fan trips?

A
  • overcurrent
  • undervoltage
  • low flow
  • CO2
20
Q

what is required for the EDG to be in auto start?

A
  • remote/local/maintenance in remote
  • normal/emergency takeover in normal
  • shutdown relay not energized
  • diesel generator lockouts reset
  • barring device not engaged
  • start failure relay not energized
  • 125VDC control power available
21
Q

what does the anti-pumping circuit do?

A

if a LOP were to occur within 2 seconds of a diesel breaker closure, the breaker may not reclose after it trips; the operator will have to press the trip pushbutton and close the breaker.

22
Q

what cools the diesels and what is required if you do not have cooling?

A

SACS through diesel heat exchangers. air intercooler -> jacket water-> lube oil.
upon loss of SACS, unload and secure diesel IAW AB.COOL-002.

23
Q

why is the rocker arm lube oil system seperate?

A

to prevent fuel oil contamination of the MLO system. makeup to the rocker arm lube oil system is provided from the MLO system.

24
Q

what does the starting air system provide air for?

A
  • starting
  • control
  • shutdown
25
Q

what is the purpose of the woodward governor?

A

it’s a mechanical governor that is set higher than electrical; electrical fails high and mechanical will take over.

26
Q

how many starts is each air receiver tank capable of?

A

5 starts.

27
Q

what is required after a lockout to reset it?

A

the “engine reset” pushbutton must be pressed prior to resetting the lockout; must wait 140 seconds, buttons pressed locally, then 86 device could be reset.

28
Q

how is lube oil makeup controlled?

A

a solenoid valve that will fail closed on a loss of power; can be overridden locally with a control knob at the base of the valve.

29
Q

how long does it take for the diesel to start and come up to rated voltage?

A

10 seconds; 13 seconds are allowed for signal processing time.

30
Q

what does the diesel breaker failure protection do?

A

trips the diesel & trips the normal and alternate feeder breakers.

31
Q

what does a LOCA start do?

A
  • all NORMAL stops disabled (emergency still works)
  • test lockout relay disabled
  • governor shifts to isochronous (4160V) and voltage control is disabled (10C651)
  • opens EDG output breaker if running in TEST.
32
Q

what are the positions of the local engine control switch and what do they do?

A
  1. remote- control from remote engine control panel or the control room.
  2. local- control locally; all auto starts disabled.
  3. maintenance- control locally; all auto starts and excitation disabled.
  4. auto (MCR bezel)- if out of auto, no MCR starts available.
33
Q

what does the remote generator EMERGENCY TAKEOVER do?

A
  • enables control of diesel and breaker from remote generator and engine control panels.
  • diesel WILL NOT RESPOND TO A LOCA. (LOP responds to <70% bus voltage signal only).
34
Q

what does the diesel have to be in during a normal load test surveillance?

A

droop. for proper load sharing characteristics.

35
Q

what must you do if the flame arrestor is damaged?

A

inspect to ensure the fuel transfer pumps work.

systems. (8 decks)

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