AEPS – study guide and certification preparation material
Purpose of Alternate Emergency Power Supply system - ANS ✔✔A permanent source of backup
AC power to the safety related 4160V AC busses that would be used if the EDGs failed to
perform and the site has lost offsite power
Draw a one-line diagram of the AEPS system - ANS ✔✔
COOP Incoming Feed Power - ANS ✔✔Central Electric Power Company has a 69kV substation.
Transformer reduces 69kV to 13.8kV.
AEPS DG Ratings - ANS ✔✔V-16 twin turbocharged
2000kW
2500kVA
13.8kV
1800 rpm, 60 Hz, 3 phase
At full load,consumes about 140 gal/hr.
3500 gal tank sufficient for 24 hours with SI
DG Starting Source - ANS ✔✔Dual electric motor start with independent 24vdc batteries.
Chargers receive 120vac from PA501 switchgear
AEPS Fire Protection System - ANS ✔✔Switchgear room has fire detection only.
Each diesel enclosure has heat activated sensors that trip at 225F. Also has two manual
actuation stations. On an actuation, a 30 second delay allows time for escape before three 100#
CO2 cylinders discharge.
Fire suppression also closes intake and exhaust louvers and trips engine. Smells like
wintergreen.
Purpose of Alternate Emergency Power Supply system - ANS ✔✔A permanent source of backup
AC power to the safety related 4160V AC busses that would be used if the EDGs failed to
perform and the site has lost offsite power
Draw a one-line diagram of the AEPS system - ANS ✔✔
COOP Incoming Feed Power - ANS ✔✔Central Electric Power Company has a 69kV substation.
Transformer reduces 69kV to 13.8kV.
AEPS DG Ratings - ANS ✔✔V-16 twin turbocharged
2000kW
2500kVA
13.8kV
1800 rpm, 60 Hz, 3 phase
At full load,consumes about 140 gal/hr.
3500 gal tank sufficient for 24 hours with SI
DG Starting Source - ANS ✔✔Dual electric motor start with independent 24vdc batteries.
Chargers receive 120vac from PA501 switchgear
AEPS Fire Protection System - ANS ✔✔Switchgear room has fire detection only.
Each diesel enclosure has heat activated sensors that trip at 225F. Also has two manual
actuation stations. On an actuation, a 30 second delay allows time for escape before three 100#
CO2 cylinders discharge.
Fire suppression also closes intake and exhaust louvers and trips engine. Smells like
wintergreen.
