AMSAC

Question 1

What arms AMSAC?

What will AMSAC do when actuated?

Answer 1

ARMS

Lo-Lo L_sgwl < 11% 3/4 (one from each loop)

+

P_turb > 32% (P_imp) 2/2

Actions

• trip turbine
• start AFW pumps (Motor and turbine)

Question 2

How long must L_s/g be below 11% for AMSAC to actuate?

How long is AMSAC armed after P_imp lowers below 32%?

Answer 2

25 sec below 11%

armed for 240 sec

Question 3

What is the postulated event that AMSAC is designed to mitigate?

Answer 3

ATWIS with a loss of feedwater

• ATWIS and loss of FW
• loss of heatsink, still generating a lot of heat
• RCS will heatup and Pressure will increase
• could damage RCS piping/ components