3.2 Power Distribution Limits

Question 1

3.2.1 Heat Flux Hot Channel Factor

Answer 1

Within limits of the COLR

APPLICABILITY MODE 1 RTP ≥ 25% with OPDMS not monitoring

ACTIONS
Exceed limits
Reduce Thermal Power ≥ 1% RTP for each 1% FQC(W)(Z) exceeds limit within 15 minutes after determination
AND
Reduce OPΔT trip setpoints ≥1 % for each 1% FQC(W)(Z) exceeds limit within 72 hours after determination
Perform surveillances prior to raising power above the limit reduced to
If actions not met, reduce power <25% RTP within 6 hours

Question 2

3.2.2 Nuclear Enthalpy Rise Hot Channel Factor

Answer 2

FNΔH within the limits of COLR

APPLICABILITY MODE 1 ≥ 25% RTP and OPDMS not monitoring

ACTIONS
A. Not within limits
A.1 Restore within 4 hours
OR
A.1.2.1 (2) Reduce power to <50% RTP within 4 hours and reduce OPΔT trip setpoints ≤ 55% RTP within 72 hours
AND
A.2 Perform surveillance within 24 hours
AND
A.3 Perform surveillances prior to exceeding 50%, 75% and 24 hours after power reaching ≥ 95% RTP
B. Not Met…reduce power < 25% within 6 hours

Question 3

3.2.3 AFD

Answer 3

Shall be maintained within the target band about the target AFD

May deviate outside the target band <90% RTP provided AFD is in acceptable operation limits and ≤ 1 hour cumulative penalty minutes during the previous 24 hours

May deviate outside the target band with power <50%

APPLICABILITY: Mode 1 > 15% with OPDMS not monitoring

ACTIONS
A. Power ≥ 90% and not within target band
A.1 Restore to within band within 15 minutes or lower power <90% within the following 15 minutes
C. 50-90% power and outside the acceptable range or >1 hour penalty minutes
C1. Reduce power <50% within 30 minutes.
D Completion time of C not met, lower power to ≤15% within 9 hours

Question 4

3.2.4 QPTR

Answer 4

QPTR shall be ≤ 1.02

APPLICABILITY: MODE 1 with power >50% and OPDMS not monitoring parameters

ACTIONS
A. Not within Limit
A.1 Lower power ≥ 3% from RTP for each 1% of QPTR> 1.00 in 2 hours
AND perform QPTR surveillance 1x/12 hours
AND perform peaking factor surveillance 24 hours after achieving equilibrium from power reduction and 1x/7 Days thereafter
AND reevaluate safety analyses prior to increasing power above the reduced limit
AND A.5 -recalibrate excores after safety analyses and prior to raising power
AND A.6 perform peaking factor surveillance within 24 hours achieving equilibrium and not greater than 48 hours going above reduced power level
B. A actions not met, reduce power ≤ 50% RTP within 4 hours.

Question 5

3.2.5 OPDMS Monitored Parameters

Answer 5

The following parameters shall not exceed their operating limits as
specified in the COLR:
a. Peak Linear Heat Rate;
b. FNΔH ;
c. DNBR; and
d. SDM.

APPLICABILITY: MODE 1 with THERMAL POWER ≥ 25% RTP and with OPDMS
monitoring parameters a, b, and c.
MODE 1 with OPDMS monitoring parameter d.
MODE 2 with keff ≥ 1.0 and OPDMS monitoring parameter d.

ACTIONS
A. One of a - c UNSAT, restore within 1 hour
B. Required action and time of A not met, lower power <25% within 4 hours
C Parameter d UNSAT, initiate boration to restore SDM within 15 minutes