L-3

Question 1

What is the minimum temperature for criticality?

What are the basis for this temperture?

What must be done if you recieve the Tave/Tref deviation alarm?

Answer 1

541 deg F

• MTC in analyzed range (not to positive)
• instrumentation in analyzed range
• Pzr operable with bubble
• RV above minimum Nil Ductility temperature

log Tavg every 30 minutes

Question 2

What must be done if you change power >15% in one hour?

Why

Answer 2

notifiy chemistry

they have requirement to sample for radioiodine spiking (checking for leaky fuel)

Question 3

Why is it important to monitor Steam header pressure during ramps to 20% power?

Answer 3

• Stm header pressure at 0% power = 1005#
• atm dumps setpoint = 1020#
• you are only 15# away from poping 10% stm dumps

therefore

when ramping at low powers you must monitor stm header pressure and take action if you approach setpoint

if stm dumps pop, could c/d to 541 deg F

could also cause SG feed and level transients resulting in trip and SI

Question 4

Why is it important to monitor excore instrumentation during power accension to 30%?

Answer 4

low leakage cores have problems with calibration of excore detectors

Question 5

Why should all operations that affect RCS temperature (during OP L-3) be done slowly?

Answer 5

so doppler can counter MTC