Aux Feed Water

Question 1

How do you ensure Water to the steam generators on a Loss of AC

Answer 1

• CST + TDAFP
• EDG + MDAFP + CST

Question 2

How do you ensure Water to the steam generators on a loss of main feed water

Answer 2

• CST
• MDAFP
• TDAFP

Question 3

How do you ensure Water to the steam generators on a Loss of condensate storage tank level

Answer 3

CRV- 51 CST crosstie

Question 4

How do you ensure Water to the steam generators on a steam line rupture

Answer 4

Steam Generator Stop Valves close

Question 5

How do you ensure Water to the steam generators on a Feed Water Line Rupture

Answer 5

FWI signal, FMO’s and FRV’s Close. Feed with aux feed

Question 6

MDAFP autostarts

Answer 6

1. Both Main Feed Pumps Trip (if switch is in auto)
2. Amsac
3. Loadshed
4. Lo Lo Steam Generator Level
5. SI

Question 7

MDAFP trips

Answer 7

1. Load Shed
2. Overload
3. Over Current

Question 8

TDAFP Autostarts

Answer 8

1. Undervolt 4kv rcp bus
2. SI
3. Amsac

Question 9

TDAFP Trips

Answer 9

1. Electric overspeed 108%
2. Mechanical Overspeed 111%
3. Manual

Question 10

Operator actions involving aux feed

Answer 10

• Crosstie aux feed between units
• valve in bearing cooling
• reset trip and throttle valve
  
  • mechanical overspeed (harpooning the shaft) must be reset locally

Question 11

How do you establish local control of aux feed to maintain steam generator level control

Answer 11

• East main steam stop enclosure or startup blowdown flashtank room
• take local control with lsi’s
• with aux feed pumps running throttle manual valves to control aux feed flow to steam generator