ESW

Question 1

What are the ESW pump auto starts with pump switch in auto?

Answer 1

• Low Header Pressure < 40# (only in Auto)
• SI
• Load Shed
• Opposite unit SI

Question 2

Will the ESW pump discharge valves automatically open on an auto ESW pump start?

Answer 2

• Yes

Question 3

Will the ESW pump discharge valves automatically open on a manual pump start?

Answer 3

• Yes

Question 4

Will the ESW discharge valve auto close on a trip?

Answer 4

• No, they have no automatic closure function

Question 5

What are the ESW pump trips?

Answer 5

• Load Shed
• Overload/Overcurrent
• Manual

Question 6

What are the ESW pump power supplies?

Answer 6

• T11/21D East Pump

- T11/21A West Pump

Question 7

What happens with the ESW to CCW HX outlet valves on a SI?

Answer 7

• ESW to CCW HX outlet valves go to pre-determined throttle position of approx 5500 gpm
• CCW Hx outlet valves can be re-positioned with Ctrl Switch after they reach their SI preset position**

Question 8

What happens with the ESW to CTS HX outlet valves on a SI with Phase B?

Answer 8

• CTS HX outlet valves go to pre-determined throttle position of approx. 2400 gpm (CTS Signal with ICM-305 or 306 Recric Sump Valves open)
• Don’t need it until on Recirc sump

Question 9

Will opening the alt ESW supply to the EDG cause the EDG to be inoperable?

Answer 9

• Yes, it will because if you were to have a single failure, you have the potential to lose both trains of cooling

Question 10

How is the alt ESW supply to the EDG operated?

Answer 10

• Manually only

Question 11

Which ESW header has the TDAFP emergency suction supply?

Answer 11

• West Header

Question 12

Which ESW header has the E MDAFP emergency suction supply?

Answer 12

• East Header

Question 13

Which ESW header has the W MDAFP emergency suction supply?

Answer 13

• East Header

Question 14

At what temp will the standby ESW room fan start?

Answer 14

• 90°F

Question 15

When will the selected ESW room fan start?

Answer 15

• On an ESW pump Start

Question 16

Which units CA supplies both units ESW backwash strainer?

Answer 16

• Unit 1

Question 17

Describe the Auto actions of the ESW Pp Disch Strainer?

Answer 17

• Automatic backwash of strainers at 86.5” H2O
• And once every 24 hrs on timer
• Backwash for 2 minutes
• Refill 1 minute

Question 18

What is the max UHS Temp for Unit 1 and Unit 2 per TS 3.7.9?

Answer 18

• 86.9°F

Question 19

What is the timing for the ESW sequence start on a loadshed w/o SI?

Answer 19

• 7 Seconds

Question 20

What is the timing for the ESW sequence start on a loadshed with SI or CTS?

Answer 20

• 19 Seconds

Question 21

At what pressure will the Backup Air Bottles start taking over at for the ESW strainer backwash valves?

Answer 21

• 42#

Question 22

What are the ESW pump auto starts with pump switch in neutral?

Answer 22

• SI
• Load Shed
• Opposite unit SI

Question 23

If you get a Unit 2 Train A only SI, what ESW pump(s) will get an auto start signal?

Answer 23

• U2 Train A ESW

- U1 Train B ESW

Question 24

You have the ESW crossties open with both units E ESW pumps running and both W ESW pumps in standby.
If your E ESW pump on Unit 1 trips out on instantaneous overcurrent, what will happen?

Answer 24

• U2 W ESW pump will start on Low header pressure @ 40#

Question 25

When does the ESW normal supply to the EDGs automatically open, if they were not already open

Answer 25

When the EDG run relay energizes at 95% rated speed

Question 26

How do the ESW normal supply to the EDG valves fail on a loss of power

Answer 26

Fail as is