DC power. Flashcards
what kind of battery charges are there?
float or equalizing.
what is a float charge?
charger output is ~1VDC above battery voltage.
what is an equalizing charge?
charger output is ~5VDC above battery voltage.
how long does it take to fully recharge batteries?
12 hours.
what happens when charger output is high enough to trip the charger?
DC high voltage shutdown occurs.
how does ground detection work?
one light will get brighter and the more dim light has the ground present.
how long does the 1E 125VDC battery last?
4 hours.
what are the 1E 125VDC battery charger trips?
- 152VDC
- overcurrent (trips AC supply, DC output, 480VAC MCC feeder breakers
what pump breakers do 1E 125VDC provide control power for?
- RHR
- core spray
- SACS
- SSWS
- 400/403 chiller
what valves does 1E 125VDC provide control power for?
- HPCI
- RCIC
what switchgear does 1E 125VDC provide control power for?
1E switchgear.
how long is the non-1E 250VDC battery rated for?
one hour.
what pumps does the non-1E 250VDC supply power to?
to emergency LO pumps:
* RPFT(3)
* emergency seal oil pump
* main turbine EBOP
how long does the 1E 250VDC battery rated for?
4 hours
what does 1E 250VDC provide power for?
HPCI and RCIC pumps and valve motive force.
how long does the non-1E 125VDC battery last for?
4 hours
when do the non-1E 125VDC battery chargers trip?
high voltage @ 152VDC.
which breaker do you open first for battery charger operations?
AC breaker.
prevents damage to components, such as rectifiers.
which breaker do you close first for battery charger operations?
DC breaker.
allows circuit to precharge to prevent damage.
which inverters does 1E 125VDC provide backup DC to?
481/482 inverters.
what is the 24VDC rated for?
(AD307, BD307)
4 hours.
what does the 24VDC provide power to?
- SRMs
- IRMs
- aux trip units (NS4 and RPS interface)
how does 1E 125VDC operate on a LOP?
not load shed and sequenced back on; they stay on.
which DC sources are LOCA load shed?
- non-1E 125VDC
- non-1E 250VDC
- 24VDC
