QB/QD- Essential/Emergency Lighting

Question 1

What is the purpose of the Emergency Lighting (QD) system?

Answer 1

provides light in the control room on a loss of Essential lighting for a minimum period of 8 hours

Provide sufficient illumination for the operator to perform the required safe shutdown actions in the event of a loss of essential power in the areas where operator local manual actions are required for safe shutdown in the event of fire in the control room for a minimum of 8 hours

Provide sufficient illumination in all plant areas and illuminate the EXIT signs to support the safe egress of personnel for a minimum period of 90 minutes

Question 2

Where is QD (Emergency Lighting) provided?

Answer 2

Control Room, local control stations, remote shutdown panel, along routes from the Control Room to locations where local manual operation of safe shutdown equipment in the event of fire is required and to the remote shutdown panel

Question 3

Where does Essential Lighting (QB) system get power from? What system provides control power?

Answer 3

3 phase 480V power from PG, PH

PK

Question 4

How does QB interact with In Plant communications?

Answer 4

Provides power to the In Plant Communication systems equipment

Question 5

How does QB interact with FP?

Answer 5

Provides power to FP subpanels

Question 6

What does the QA (normal lighting) system do for the Emergency Lighting (QD) system? Where else can it get 277/120 VAC?

Answer 6

QD receives 277 or 120 VAC for rechargeable light fixtures and exit signs from QA system

QB system

Question 7

What happens if I lose power to essential FP panels QBN-D81 and QBN-D84? Where are these panels powered from?

Answer 7

Will activate the Control Room Emergency Lighting UPS system and rechargeable emergency light fixtures in the Control Building 100’ and 140’ levels

QB (essential lighting system)

Question 8

Where are the QB 480V/120V Voltage Regulators located? What purpose do they serve?

Answer 8

Class A and B DC Equipment Rooms on the 100’ level of the Control Building

step down voltage, they are short circuit protected which prevents secondary side issues traveling to the primary side and vice versa, also an isolating transformer for class primary side and non-class secondary side

Question 9

What does the Control room emergency lighting Uninterruptible Power Supply units consist of? What happens upon a loss of AC power?

Answer 9

Charger, inverter, electromechanical switch, batteries, and battery racks located outside each cabinet

auto transfers from QB to the battery power source

Question 10

Where are the Control room emergency lighting charger/inverter units located?

Answer 10

Control Building 140’

Question 11

How much voltage is provided when “Float” is selected?

Answer 11

135 VDC

Battery is on “Float or Trickle” charge in this mode

Question 12

What components does the QD (emergency lighting) system consist of? How long do the back up batteries last?

Answer 12

automatic lights, back up batteries, battery chargers, lamps, and switches

8 hours

Question 13

What is the purpose of the QB (essential lighting) system?

Answer 13

lights up control room and remote shutdown panel on a loss of QA (normal lighting)

lights up areas to allow for safe access throughout the plant on a loss of the QA (normal lighting) system

charges QD (emergency lighting) UPS batteries, battery packs in the 8hr emergency light fixtures and 90 minute emergency light fixtures

lights up safe shutdown equipment for local manual operation during a fire

Question 14

Where does the QF (in-plant communications) system receive power from?

Answer 14

QB (essential lighting system)

Question 15

What is the purpose of the essential lighting distribution panel?

Answer 15

main essential lighting panels, QBN-D90 and D91, provide power to distribution panels through circuit breakers and transformers

QBN-D81 and D84provide uninteruptible power to the control room and remote shutdown panels

Question 16

Where are QBN-D90 and -D91 powered from?

Answer 16

PGA and PGB SIAS load shed panels

Question 17

Do the QD and QB systems trade power back and forth?

Answer 17

QD receives power normally from QB, but when QB is lost, QD powers QB fixtures and exit signs

Question 18

What’s my name, bitch?

Answer 18

Sweet-T

Question 19

Where are the emergency lighting UPS systems located?

Answer 19

ZA (aux. building)

ZJ (control building)

Question 20

What the hell does HJ (control building HVAC) have to do with Emergency lighting?

Answer 20

provides exhaust fans to the battery rooms housing control room emergency lighting UPS batteries

Question 21

What is the purpose of the QDN-N03 and N09 UPS units? What happens when QB power returns?

Answer 21

provide backup power for safe shutdown area lighting for 8 hours upon a loss of the QB (essential lighting) system

UPS goes into equalizing mode to charge the QD batteries

Question 22

What is the purpose of the rechargeable battery pack emergency light fixtures?

Answer 22

provide the minimum amount of the illumination required in the immediate vicinity for operation of the equipment of safe movement of operators for a minimum period of 8 hrs duration. (not normally light up)

On loss of AC power the control circuit turns “on” automatically connecting the battery to energize the sealed beam lights to illuminate the immediate area

there are also 90 minute light fixtures that work the same way

Question 23

How long will rechargeable exit signs stay light up after a loss of normal power? Where are they normally powered from?

Answer 23

90 minutes

normal and essential lighting systems

Question 24

During normal operation, the QB and QD lighting systems are on float or equalize mode?

Answer 24

float

Question 25

Concerning the control room, how long after essential lighting is lost will the emergency lighting come on?

Answer 25

6 cycles (100 milliseconds)