Decrease in Heat Removal TAA

Question 1

For a Decrease in Heat Removal, what is the assumed trip initiator?

Answer 1

High PZR press trip

Question 2

For a Decrease in Heat Removal event, what is a Key Assumption that helps MAINTAIN safety?

Answer 2

There are NO credible failures that degrade PZR safeties or MSSV capacity

Question 3

What is the limiting event for a Decrease in Heat Removal event?

Answer 3

• Loss of Condenser Vacuum

Question 4

During a Decrease in Heat Removal event, what is the limiting CONDITIONS for LONG TERM HEAT REMOVAL

Answer 4

ALL of the following:

• Feedwater Line Break
• LOOP
• Failure of Fast Bus Transfer

Question 5

What determines whether a FW line break is small or large?

Answer 5

• 0.20 ft2 and above is Large