FR-C.1, C.2, C.3(core cooling)

Question 1

FR-C.1

What are the methods (MAC) for restoring cooling to core?

Answer 1

• restore ECCS
• Depress secondary
• Start RCP
• Depress RCS

Question 2

FR-C.1

Why do we stop depress S/G when RCS WR reaches 250 psig?

Answer 2

to isolate accumulators and prevent N₂ injection

Question 3

FR-C.1

What is the minimum requirment to start an RCP to restore cooling in “inadequate core cooling”?

What is your last resort RCP?

Answer 3

• heat sink (L _s/g >15% NR)
• RCP available and not operating
• RCP 2 (spray)

Question 4

FR-C.2

In begining of procedure what action will you take if all RCPs are running?

prior to depressurizing all intact S/Gs to atmospheric pressure why are all RCPs secured?

Answer 4

stop RCP 2 and continue in procedure (rest of RCPs left on to support two phase flow)

RCP #1 seal d/p will be lost