RQ-C-4864 (AFW)

Question 1

What are the preferred suction sources for AFW listed in order

Answer 1

1) Affected Unit CST
2) Unaffected Unit CST
3) Affected Unit hotwell
4) ESW

Question 2

What happens in the AFW system as a result of a flow conservation signal

Answer 2

• DCRs close (SG blowdown terminated)
• AFW test valves close
• AFW FMOs open

Question 3

Unit 1 was operating at 100% power with the East MDAFP OOS. 15 minutes ago a reactor trip was initiated due to a large steam break on SG 12. Given the following conditions:

The steam break has finished blowing down.
The SGSVs (MRV-210 & 240) for SG 11 and 14 closed as expected.
The SGSVs (MRV-220 & 230) for SG 12 and 13 failed to close.
Bus T11A is de-energized due to a fault experienced on the trip.

What is the only AFW supply (pump) that can be aligned to feed SGs 11 & 14?

Answer 3

• U2 East MDAFP via crosstie (TDAFP no available due to SG 12 & 13 blowing down as a result of steam line break).