DC power.

Question 1

what kind of battery charges are there?

Answer 1

float or equalizing.

Question 2

what is a float charge?

Answer 2

charger output is ~1VDC above battery voltage.

Question 3

what is an equalizing charge?

Answer 3

charger output is ~5VDC above battery voltage.

Question 4

how long does it take to fully recharge batteries?

Answer 4

12 hours.

Question 5

what happens when charger output is high enough to trip the charger?

Answer 5

DC high voltage shutdown occurs.

Question 6

how does ground detection work?

Answer 6

one light will get brighter and the more dim light has the ground present.

Question 7

how long does the 1E 125VDC battery last?

Answer 7

4 hours.

Question 8

what are the 1E 125VDC battery charger trips?

Answer 8

• 152VDC
• overcurrent (trips AC supply, DC output, 480VAC MCC feeder breakers

Question 9

what pump breakers do 1E 125VDC provide control power for?

Answer 9

• RHR
• core spray
• SACS
• SSWS
• 400/403 chiller

Question 10

what valves does 1E 125VDC provide control power for?

Answer 10

• HPCI
• RCIC

Question 11

what switchgear does 1E 125VDC provide control power for?

Answer 11

1E switchgear.

Question 12

how long is the non-1E 250VDC battery rated for?

Answer 12

one hour.

Question 13

what pumps does the non-1E 250VDC supply power to?

Answer 13

to emergency LO pumps:
* RPFT(3)
* emergency seal oil pump
* main turbine EBOP

Question 14

how long does the 1E 250VDC battery rated for?

Answer 14

4 hours

Question 15

what does 1E 250VDC provide power for?

Answer 15

HPCI and RCIC pumps and valve motive force.

Question 16

how long does the non-1E 125VDC battery last for?

Answer 16

4 hours

Question 17

when do the non-1E 125VDC battery chargers trip?

Answer 17

high voltage @ 152VDC.

Question 18

which breaker do you open first for battery charger operations?

Answer 18

AC breaker.

prevents damage to components, such as rectifiers.

Question 19

which breaker do you close first for battery charger operations?

Answer 19

DC breaker.

allows circuit to precharge to prevent damage.

Question 20

which inverters does 1E 125VDC provide backup DC to?

Answer 20

481/482 inverters.

Question 21

what is the 24VDC rated for?

(AD307, BD307)

Answer 21

4 hours.

Question 22

what does the 24VDC provide power to?

Answer 22

• SRMs
• IRMs
• aux trip units (NS4 and RPS interface)

Question 23

how does 1E 125VDC operate on a LOP?

Answer 23

not load shed and sequenced back on; they stay on.

Question 24

which DC sources are LOCA load shed?

Answer 24

• non-1E 125VDC
• non-1E 250VDC
• 24VDC