BOP ESFAS

Question 1

What actuations occur if RU-29, Train A Control Room ventilation rad monitor failed high?

Answer 1

Trains A and B CREFAS
Operators use an ARP to mitigate

Question 2

What actuates on a CREFAS?

Answer 2

• Normal ventilation dampers close
• CR essential outside air dampers open
• Both CT pumps start (makeup to EC and EW surge tanks)
• CR essential AHU fans start
• EW, SP, EC pumps start

Question 3

Describe the Bypass function of the BOP ESFAS.

Answer 3

Bypass is implemented via a key lock switch
Bypasses the test and trip functions but the channel can still be cross tripped

Question 4

Describe the power supply arrangement for BOP ESFAS.

Answer 4

Train A = PNA-D25 and PKA-D21
Train B = PNB-D26 and PKB-D22

The power supplies for each cabinet are auctioneered

Question 5

Describe the RU monitors associated with BOP ESFAS.

Answer 5

FBEVAS
- RU-31 = SFP area monitor
- RU-145 = FB ventilation exhaust
CPIAS
- RU-37/38 = Containment Purge ducts in the east wrap (140’ AB)
CREFAS
- RU-29/30 = sample intake air from the CR ventilation system

Question 6

Explain the different modes of operation of the load sequencer

Answer 6

0 - No Input. Normal mode in standby
1 - SIAS/CSAS, no LOP
2 - SIAS/CSAS, with a LOP
3 - LOP only
4 - Misc. (AFAS, CREFAS, CRVIAS, FBEVAS, DGSS, DG Run)