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General Flashcards

(48 cards)

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0
Q

Reactor coolant pumps power supply

A

13.8 kV

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1
Q

Circ water pump power supply

A

13.8 kava

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2
Q

Power supplied to load centers

A

13.8 kV

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3
Q

Plant cooling water pumps (PW)

A

4160V non class

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4
Q

Power supply to nuclear cooling water pumps (NC)

A

Non class 4160 V

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5
Q

Power supply to turbine cooling water (TC)

A

Non class 4160 V

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6
Q

Power supply to extraction/heater drain pumps (ED)

A

Non class 4160 V (b S01, a S02)

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7
Q

Power supply to condensate pumps (CD)

A

4160 V non class (a&b S01, c S02)

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8
Q

Power supply to normal chiller (WC)

A

Non class 4160 V

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9
Q

HPSI pump power supply

A

4160 V class power

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10
Q

LPSI pump power supply

A

4160 V class

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11
Q

Containment spray pump power supply

A

4160 class

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12
Q

Power supply to class load center

A

Class 4160 V

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13
Q

Power supply to essential cooling water (EW)

A

Class 4160 V

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14
Q

Power supply to essential chilled water pumps (EC)

A

Class 4160 V

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15
Q

Power supply to spray ponds (SP)

A

Class 4160 V

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16
Q

Power supply to AFN valve

A

Class 4160 V off “a” bus

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17
Q

What voltage do the SBOGs generate

A

13.8kV

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18
Q

Where do the SBOGs tie in

A

S07 tie in breaker and supplies power via ESF

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19
Q

What items are the only things that supply their own control power?

20
Q

When a MCC is poem does the control have indication?

21
Q

If a 480 V MCC is open does it have control power?

22
Q

What supplies normal control power to 13.8 & 4.16kV breakers and 480 V load centers?

Study These Flashcards
A

125 Vdc for class and non class respectively.

23
Q

What is a SIAS load shed

Study These Flashcards
A

Sheds non safety related loads from 4160 V buses. Must be manually restored.

24
What causes an alternate supply breaker to trip?
If electric load shed signal is received from the control room A fault occurs on the related ESF transformer 86 lockout
25
What causes the normal supply breaker to trip?
Electric load shed signal from the control room Alternate supply breaker is closed from the control room on B01 86 lockout
26
Class 4160 automatic safety features
Degraded voltage- <75% instantaneously.
27
What is a blackout
Loss of all AC power
28
What is a loss of offsite power (LOOP)
Loss of NAN-S01&S02 | Must be both.
29
What is a loss of power (LOP)
Loss of either PBB-S04 or PBA-S03
30
Describe a 4160 V lockout relay
``` Can be rest from CR SEIS alarm in CR Brighter than green light Prevents DG from closing on faulted bus A trip also prevents closing other supply breakers ```
31
What safety feature does the B train 4160V switchgear have that makes it special
Allows the operator to shutdown and isolate from the control room in case of control room fire
32
What are the ESF transformer indications
Hot oil temp-top of trx Hot spot indicator-measures high voltage winding temp Level indicator- measures tank oil level
33
ESF phase and ground over current
Causes a lockout if excessive current is detected in the neutral-ground on secondary side of transformer winding. Also trips a lockout relay on NAN-S03, PBA-S03, PBB-S04
34
What is an ESF transformer differential
Monitors current leaving NAN-S03 and checks for a difference between PBA-S03 & PBB-S04. A difference trips a lockout relay and opens the breakers mentioned.
35
ESF automatic transfer relay
Monitors cooling power supply and initiates auto transfer to alternate power upon loss of normal aux power Initiates an alarm locally and in the control room.
36
What is BOP ESFAS
Balance of plant engineered safety feature actuation system (Starts DG in emergencies) (Sequences loads and opens proper valves in emer situation)
37
How does the PB system respond to a loss of it's associated support systems?
Loss of 4160 V bus= DG unavailability, even from opposite train If dc control power lost, must be manually operated and no trip protection or CR indication available. Causes loss of one train and relies on one train for safe shutdown
38
What are the automatic features associated with the PG/PH systems?
SIAS load shed panels
39
What are the ESF transformer indications?
Hot oil temperature Hot spot temp indicator Liquid level indicator
40
ESF service transformer protection- sudden pressure relay
Detects rapid pressure increase in transformer caused by pressure increase Trips lockout relay (trips transformers high side breaker)
41
What are the three positions of class load center circuit breakers?
Operating Test Withdrawn
42
What do load centers do?
They transform 4160 V to 480V for distribution throughout the plant. Naturally cooled until temp>180*C then forced air natural circ
43
Why do non class 480 V load centers have a KIRK key interlock but not class 480 V?
This provides a method for working on a single load center while still supplying power to other MCCs
44
What's the purpose, operation and location of the class load center feeder breakers?
Supplies power to the LC 480 V On secondary side of the 4160/480 V bus Breaker trip causes a lockout that can be reset locally and from the control room.
45
What is the cooling method for the unit aux transformer
Forced air natural circulation | Single bank of cooling with one backup
46
What are the class 480V MCC breaker positions?
On Off Tripped (only occurs on ground fault)
47
What is the method for cooling for the main transformer?
Forced oil and air First bank starts when energized Second @70*C Third @75*C

Electrical Distribution (1 decks)

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