LOT 201.35 Non-Class DGs Flashcards Preview

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Flashcards in LOT 201.35 Non-Class DGs Deck (15):
1

LOT 201.35 Non-Class DGs


How are the Non-Class DGs started?

BOP / NTF / LTG:
Two 24 VDC Electric Starting Motors
Rated for 10 Starts

Flex:
One 24 VDC Electric Starting Motors

TSC:
Air Driven Starting Motor (90 - 120 psig)

2

LOT 201.35 Non-Class DGs


Where are the Non-Class DGs physically located?

TSC DGs:
N of TB enclosed in Trump Wall

BOP DGs:
31' TB SE side

Flex DGs:
MAB Roof

Lighting DGs:
S Side between Units

NTF DG:
W of NTF

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3

LOT 201.35 Non-Class DGs


What prevents synchronizing a Non-Class DG onto a live bus?

Output CBs ELECTRICALLY interlocked to prevent being closed while normal bus feed is closed

4

LOT 201.35 Non-Class DGs


What trips the BOP / NTF / LTG DGs?

BOP / NTF / LTG:

Engine Overspeed
≈ 115% (2073 rpm)

Lube Oil Pressure - Low
(20 psig)

Cooling Water Temperature - High
(210 ˚F)

Generator Overcurrent
(2400 amps)

Generator Volts/Hertz NOT within Limits
(2.2 V/Hz for greater than 15 seconds)
N/A for Unit 2 BOP AND NTF

Engine Over crank [Lockout]
(3 cycles)

Ground Fault (NTF ONLY)

5

LOT 201.35 Non-Class DGs


What trips the Flex DGs?

Engine Overspeed
(1980 rpm)

Lube Oil Pressure - Low
(73 psig)

Cooling Water Temperature - High
(215°F)

Coolant Level - Low
(sensor in upper portion of radiator)

Engine Overcrank [Lockout]
(3 cycles)

6

LOT 201.35 Non-Class DGs


What loads does the Flex diesel supply?

Normal:
Flex RCS M/U Pumps
Flex S/G M/U Pumps
Flex SFP M/U Pumps

Backup:
CVCS PDP
RCB Equipment Hatch Hoist
B/U to TSC DG
480V ESF LC and MCC


Supplies 480V LC DP1000

480 V / 1000 kW / 1800 RPM


Note:
Within 8 hours following an Extended Loss of AC Power (ELAP) the FLEX Diesel Generator will be running providing power to support SG make-up, RCS make-up, SFP make-up, and other functions in support of STP's FLEX strategies.

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7

LOT 201.35 Non-Class DGs


What trips the TSC DGs?

Engine Overspeed
≈ 110% (1980 rpm)

Lube Oil Pressure - Low
(30 psig)

Cooling Water Temperature - High
(210 ˚F)

Loss of Excitation
(≥ 2 sec)

Overcurrent
(300 Amps)

Phase Differential [Lockout]

Engine Over crank [Lockout]
(3 cycles)

8

LOT 201.35 Non-Class DGs


What loads does the NTF DG supply?

Motor-Driven Fire Pump House

NTF Simulator


Feeds 480V 12N

BOP, NTF, and Security LTG DGs: 480 VAC / 700 KW / 1800 RPM

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9

LOT 201.35 Non-Class DGs


What loads does the Security Lighting DG supply?

Security LTG

EAB UPS

Intake Structure LTG


Feeds 480V 12K3

BOP, NTF, and Security LTG DGs: 480 VAC / 700 KW / 1800 RPM


Note:
Auto Starts on loss of voltage, comes up to speed and closes breaker in 15 seconds

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10

LOT 201.35 Non-Class DGs


What loads does the BOP diesel supply?

Battery Chargers 125V/250V

IA Compressor 14

Turning gears for MFPs and Main Turbine

Bearing Oil Lift Pump

Air Side Seal Oil Pump


Feeds MCC 1G5

BOP, NTF, and Security LTG DGs: 480 VAC / 700 KW / 1800 RPM


Note:

  • BOP DG Fuel Tank will last 60 mins
  • Auto Starts on loss of voltage, comes up to speed and closes breaker in 15 seconds

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11

LOT 201.35 Non-Class DGs


When will the Non-Class DGs trip on overspeed?

BOP / NTF / LTG:
2073 RPM
≈115% of 1800 RPM

TSC / Flex:
1980 RPM
110% of 1800 RPM


Note:
TSC DG also equiped with device to prevent overloading TSC DG during S/U. (Puts TDs on when loads can be started)

12

LOT 201.35 Non-Class DGs


What control room indications are their for the Non-Class DGs?

BOP / LTG / TSC:
CP003 (Trouble alarms)

Flex / NTF:
None

13

LOT 201.35 Non-Class DGs


What loads does the TSC DG supply?

ICS Computer

CVCS PDP

FHB IVC LTG XFMRs

RCB Equipment Hatch Hoist
Flex DG provides B/U power

Emergency XFMR cooling fans


Feeds 4.16 kV LC 1W1 → MCC 1G8

4.16 kV / 1200 kW / 1800 RPM


Note:
Auto Starts on loss of voltage, comes up to speed and closes breaker in 15 seconds

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14

LOT 201.35 Non-Class DGs


What auto starts the Non-Class DGs?

BOP / NTF / LTG / TSC:
Bus Undervoltage
2 sec from UV to breaker shutting
Auto start blocked if feeder breaker tripped on Overcurrent

Flex:
No auto starts


BOP / NTF / LTG / TSC:

  • Switch has 3 positions - Hand / OFF / AUTO
    • Auto allows UV start
    • OFF prevents start (TSC 5 min C/D)
    • Hand starts DG in manual (TSC requires pressing start button in addition to Hand)

Note:
Pushing the Manual Auto to Bypass Pushbutton allows going from Hand to Auto w/o shutting down DG.

15

LOT 201.35 Non-Class DGs


What are the Non-Class DG output breakers close permissives?

Normal Supply Breaker Open
No overcurrent trip on supply breaker
No Lockout Relays energized
Mode Switch NOT in off
Remote Switch NOT in PTL (TSC ONLY)