Main Feed Water

Question 1

Purpose of Main Feed Water

Answer 1

• continuous flow of uniform temperature water to the steam generators
• 10% step or 5% per minute ramp rate without steam dumps

Question 2

What happens on a Feed Water Isolation Signal

Answer 2

FRV’s shut within 2-6 seconds

FMO’s shut within 44 seconds

Question 3

Main Feed Water Isolation Signals Generated by

Answer 3

• SI
• Hi Hi Sg level
• Reactor Trip with low t-ave

Question 4

How do the FRV’s Operate if the valve is off neutral

Answer 4

Closing the valve cand damage the diaphragm