TPBE

Question 1

What is the Purpose of the Thermal Power Best Estimate indication?

Answer 1

Provides an on-line accurate indication of both primary and secondary plant thermal power to ensure that the plant does not exceed the Technical Specification limit for RTP (Rated Thermal Power) 3469 MWt (Unit 1) and 3411 MWt (Unit 2).

Question 2

How is Thermal Power Best Estimate defined?

Answer 2

The weighted average of primary and secondary heat balances which gives the most accurate indication of reactor thermal output.

Question 3

What parameters input the Primary Heat balance?

Answer 3

-NC flow
-Delta Ts
-primary losses

Q=NC flow x (Th-Tc) + primary losses

Question 4

What parameters input the Secondary Heat balance?

Answer 4

CF Flow (+ input)
CA flow (+ input)
Excess/Normal letdown flow (+ input)
Secondary losses (+ input)
NCP heat (- input)
Blowdown (- input)
Charging flow (- input)
NC Pump Seal flow (- input)

Question 5

At what power level does the Thermal Power Best Estimate come from the Primary heat balance?

Answer 5

Unit 1 - 0%-20%
Unit 2 - 0%-40%

Question 6

At what power level does the Thermal Power Best Estimate come from the Secondary heat balance?

Answer 6

Unit 1 - 50-100%
Unit 2 - 50-100%

Question 7

At what power level does the Thermal Power Best Estimate come from both the Secondary heat balance and the Primary Heat Balance?

Answer 7

Unit 1 - 20%-50%
Unit 2 - 40%-50%

Question 8

What is the mode of Applicability for SLC 16.7-18 Leading Edge Flow Meter (LEFM) System?

Answer 8

Mode 1

Question 9

What is the required action if LEFM System is non-functional when thermal power is less than or equal to 98.32% RTP (less than or equal to 3411 MWt) per SLC 16.7-18 Leading Edge Flow Meter (LEFM) System?

Answer 9

-Immediately Restrict thermal power to
< 98.32% RTP (< 3411 MWt).

Question 10

What is the required action if LEFM System is non-functional when thermal power level is > 98.32% RTP (> 3411 MWt). per SLC 16.7-18 Leading Edge Flow Meter (LEFM) System?

Answer 10

Immediately Suspend operations involving increasing
thermal power.

————–NOTE————–
Normal variations in power, such as those associated
with plant fluctuations and boron adjustment, are
permitted.
———————————

Question 11

What is the purpose of LEFM (Leading Edge Flow Metering) system?

Answer 11

Calculates CF mass flow and feeds that input to Thermal Power Best Estimate

Question 12

Which Unit uses LEFM (Leading Edge Flow Metering) system?

Answer 12

Unit 1

Question 13

What parameters in the Secondary Heat balance are added in?

Answer 13

CA
Ambient losses
Letdown (excess and normal)
CF