Section 3.2 Power Distribution Limits

Question 1

• LCO 3.2.3 Nuclear Enthalpy Rise Hot Channel Factor*
• • *

When is LCO 3.2.3 Nuclear Enthalpy Rise Hot Channel Factor Applicable?

Answer 1

MODE 1

Question 2

• LCO 3.2.1 AFD*
• • *

When ≥ 90% RTP, what are your ≤ 1 hour action(s) if AFD is outside the target band?

Answer 2

• LCO 3.2.1 AFD*
• Action A.1*
• • *
• Restore AFD to target band [15 min]

OR

• Reduce RTP to < 90% RTP [15 min]
• • *

​Target band is +5 / -10

Note:
Considered outside target band if ≥ 2 excore instruments indicating outside band.

Question 3

• LCO 3.2.1 AFD*
• • *

When is LCO 3.2.1 AFD Applicable?

Answer 3

MODE 1, > 15 RTP

Question 4

• LCO 3.2.4 QPTR*
• • *

When is LCO 3.2.4 QPTR Applicable?

Answer 4

MODE 1 > 50% RTP

^{Max Upper Excore}⁄_{Average Upper Excore}

OR

^{Max Lower Excore}⁄_{Average Lower Excore}

Question 5

• LCO 3.2.1 AFD*
• • *

When < 90% RTP but ≥ 50% RTP, what are your ≤ 1 hour action(s) if AFD is outside the target band?

Answer 5

• LCO 3.2.1 AFD*
• Action A.2*
• • *

Power operation may continue if:

• Been outside target band ≤ 1 hr during last 24 hrs (Cumulative) [1 : 1 ratio]
• AFD in acceptable region in COLR

Otherwise:

• Reduce RTP < 50% RTP [30 min]
• Reduce Power Range Flux High Trip ≤ 55% RTP [4 hrs]

​> 15% RTP but < 50% RTP with AFD outside the target band cumulates time in a 2 min : 1 min penalty ratio.

Note:
Considered outside target band if ≥ 2 excore instruments indicating outside band.

Question 6

• LCO 3.2.4 QPTR*
• • *

What is the definition of QPTR?

Answer 6

The ratio of the maximum upper excore detector calibrated output to the average of the upper excore detector calibrated outputs
OR
The ratio of the maximum lower excore detector calibrated output to the average of the lower excore detector calibrated outputs

Whichever is Greater.

Question 7

• LCO 3.2.5 DNB Parameters*
• • *

When is LCO 3.2.5 DNB Parameters Applicable?

Answer 7

MODE 1

• T_avg ≤ 595 ˚F
• PZR Pressure > 2200 psig
• Thermal Design Flow ≥ 392,000 gpm
• Thermal Design Flow (COLR) > 403,000 gpm

Question 8

• LCO 3.2.2 Heat Flux Hot Channel Factor F_Q(Z)*
• • *

What are your ≤ 1 hour action(s) if F_Q(Z) is exceeding its limit?

Answer 8

• LCO 3.2.2 Heat Flux Hot Channel Factor F_Q(Z)*
• Action A*
• • *

Reduce RTP 1% for each 1% F_Q(Z) exceeds the limit [15 min]

May Continue power operation for 72 hrs if:

• Lower OT∆T Rx trip 1% for each 1% F_Q(Z) exceeds the limit

Question 9

• LCO 3.2.2 Heat Flux Hot Channel Factor F_Q(Z)*
• • *

When is LCO 3.2.2 Heat Flux Hot Channel Factor F_Q(Z) Applicable?

Answer 9

MODE 1

^{Peak kW/ft}⁄_{Average kW/ft}

Question 10

• LCO 3.2 Bases*
• • *

What is the power distribution limits bases?

Answer 10

Provides assurance for fuel integrity following Condition I and II events

Maintains DNBR ≥ 1.17

Limits Fission Gas Release

Limits Fuel Pellet Temperature

Limits cladding mechanical properties