L-6

Question 1

What is the order of Nozzle dam installation?

What must be done before the last nozzle dam is installed?

Answer 1

last nozzle dam installed must be a HOT LEG (ensures hot leg vent path always available)

• shift forman permission
• vessel head fully de-tensioned

Question 2

When must Containment Closure be established?

when must Containment Closure Capability be establised?

Answer 2

closure

• rcs not intact AND
• fuel in vessel AND
• time to boil < 20 min OR
• time to boil < time to achieve closure

capability

• rcs not intact AND
• fuel in vessel AND
• time to boil > 20 min and
• time to boil > time to achiev closure

Question 3

What is level vessel is not allowed to exceed once the head is detensioned?

Why?

Answer 3

114’ (vessel flange)

if level touches flange o-ring cleanliness is compromised and MM must be contacted to evaluate