TAA Overview

Question 1

What are the Reactor CORE SL’s

Answer 1

• DNBR ≥1.34 (protects cladding)

- Peak Fuel CL temp <5080*F (met if LPD ≤ 21 kw/ft)

Question 2

What is the RCS pressure SL

Answer 2

≤ 2750 psig

Question 3

What are the TAA event categories

Answer 3

• Increase/ Decrease Heat removal
• Decrease RCS flow
• Reactivity/ power dist. anomalies
• Increase/ Decrease RCS inventory
• Rad release from a subsystem/ component

Question 4

For TAA overview, what is a Limiting Event

Answer 4

• Worst case set of conditions in a particular event category
• Events that would require LCO’s, procedures, design to minimize consequences to health and safety of workers and public

Question 5

Per 10CFR50 what is Single Failure Criteria

Answer 5

• Results in the loss of capability of a component to perform intended safety function
• (multiple failures from single occurrence is a single failure)

Question 6

What are the expected frequencies of a Limiting Fault

Answer 6

• Normal Operations - expected frequently during power operation
• Moderate Frequency - may occur during a calendar year
• Infrequent Event - May occur during the life of the plant
• Limiting Fault - Not expected to occur, consequences could release RAD material