EFW

Question 1

State T.S. level of CST

Answer 1

212,000 gallons

Question 2

State min flow requirements for the EFW pumps

Answer 2

225 GPM/ 222GPM

Question 3

Discuss opening MS-V-393/394 and 395

Answer 3

MS-V-393/394 opens first and then 28 seconds later MS-V-395 opens, this allows for moisture to be removed.

Question 4

State what causes an EFW actuation

Answer 4

LOLO SG Level <20% 2/4 NR on 1 of 4 SGs
SI
LOP
AMSAC, 3/4 SG's NR <13% and >20% power 2/2
- Actuation isolates SB

Question 5

State how train separation for EFW FCVs and Basis

Answer 5

A/C SG FCV are A then B train
B/D SG FCV are B then A train
Only the “bench section” valves are throttled for each S/G
This ensures that a loss of 1 vital power supply will not result in a complete loss of flow to all SG’s

Question 6

Discuss the EFW flow venturi

Answer 6

Limits flow to 750 GPM

Provides flow indication to RSS panels

Question 7

Discuss the EFW Flow Orifice

Answer 7

Provides indication to MCB

Closes EFW flow control valve on high flow 565 GPM

Question 8

State actions for loss of all 3 EFW pumps T.S. 3.7.1.2

Answer 8

Loss of all three requires immediate corrective action to restore at least one pump

Question 9

State how RSS switches can affect EFW

Answer 9

RSS switch in local will defeat the high flow isolation scheme from the flow orifice