3.1 reactivity control systems

Question 1

3.1.6 Cntrl Bnk insertion limits

What purpose is served by having sequence, overlap, and insertion limits maintained?

Answer 1

• Preserve power distribution
• ensure SDM
• ejected rod worth w/in calcs
• ensure sufficient (-) reactivity inserted on Trip

Question 2

3.1.1 SDM

How long do you have to restore SDM?

What modes are this T.S. Applicable?

What are the most limiting accidents concerning SDM?

Answer 2

• 15 minutes for boration to be initiated
• applicable Mode 2 (not critical), 3 , 4, 5
• MSLB and boron Dilution

Question 3

3.1.4 Rod Grp Algnmt

How many steps does the control rods have to be within eachother?

What two parameters must be within …………steps?

Answer 3

12 steps

DRPI must be within 12 steps of step counters