CVCS (VCT Level Indication, control, failures)

Question 1

VCT purpose

Answer 1

• Provides a surge colume for the RCS during plant transients.
• Provides a volume of water for makeup due to leakage from the RCS and CVCS.
• Provides NPSH for charging pumps
• Provides a place for hydrogen and nitrogen addition to RCS.

Question 2

LT-112 and LT-115 both are needed for ?

Answer 2

-Both have to read 12.4” to auto swap charging pump suction from the VCT to the RWST.

Question 3

VCT levels. Auto makeup

Answer 3

• 20.2” auto make up start

- 24.4” auto make up stop

Question 4

VCT normal pressure

Answer 4

-22psig, low is 15psig (for backpressure on seals)