Main Electrical Distibution

Question 1

What is the DIV I& II LOCA Response?

Answer 1

T=0
- EDG receives start signal (emergency mode).
- ECCS circuitry receives start signal.

T=5sec
- ECCS pumps begin sequencing on LPCI A & B start.

T=10sec
- LPCS (LPCI C) start.
- EDG at rated voltage and frequency.

NOTE: EDG does not power the bus. It runs unloaded, ready to power the bus if unloaded.