L-2023-149, Cycle 34 Core Operating Limits Report
| ML23292A061 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/19/2023 |
| From: | Strand D Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2023-149 | |
| Download: ML23292A061 (1) | |
Text
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-00001 October 19, 2023 Re:
Turkey Point Nuclear Plant, Unit 4 Docket 50-251 Cycle 34 Core Operating Limits Report L-2023-149 10 CFR 50.36 Pursuant to Turkey Point Unit 4 Technical Specification (TS) 6.9.1.7, Florida Power &
Light Company (FPL) is submitting the Core Operating Limits Report (COLR) for operating cycle 34.
Should you have any questions regarding this submission, please contact Mr. Kenneth Mack, Fleet Licensing Manager, at 561-904-3635.
Sincerely, Dianne Strand General Manager Regulatory Affairs Florida Power & Light Company
Enclosure:
Turkey Point Unit 4, Cycle 34 Core Operating Limits Report cc:
USNRC Regional Administrator, Region II USNRC Project Manager, Turkey Point Nuclear Plant USNRC Resident Inspector, Turkey Point Nuclear Plant Florida Power & Light Company 9760 SW 344th Street, Homestead, FL 33035
Enclosure Turkey Point Unit 4, Cycle 34 Core Operating Limits Report
( 9 pages follow)
1.0 Introduction Turkey Point Unit 4 Cycle 34 Core Operating Limits Report This Core Operating Limits Report for Turkey Point Unit 4 Cycle 34 has been prepared in accordance with the requirements of Technical Specification 6.9.1.7.
The Technical Specifications (TS) affected by this report are listed below with the section and page for each one of the TS addressed in this COLR document.
Section Technical Specification 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 Figure A1 A2 A3 A4 2.1.1 2.2.1 3.1.1.1 3.1.1.2 3.1.1.3 4.1.1.3 3.1.3.2 3.1.3.6 3.2.1 3.2.2 3.2.3 3.2.5 Reactor Core Safety Limits Reactor Trip System Instrumentation Setpoints Shutdown Margin Limit for MODES 1, 2, 3, 4 Shutdown Margin Limit for MODE 5 Moderator Temperature Coefficient MTC Surveillance at 300 ppm Analog Rod Position Indication System Control Rod Insertion Limits Axial Flux Difference Heat Flux Hot Channel Factor Fo(Z)
Nuclear Enthalpy Rise Hot Channel Factor DNB Parameters Description Reactor Core Safety Limit - Three Loops in Operation Required Shutdown Margin vs Reactor Coolant Boron Concentration Turkey Point Unit 4 Cycle 34 Rod Insertion Limits vs Thermal Power Axial Flux Difference as a Function of Rated Thermal Power 14B-A2 Page 14B-A3 14B-A3-14B-A4 14B-A4 14B-A4 14B-A5 14B-A5 14B-A5 14B-A5 14B-A5 14B-A6 14B-A6 14B-A6 14B-A7 14B-A8 14B-A9 14B-A10 Revised 04/30/2024
2.0 OPERA TING LIMITS Turkey Point Unit 4 Cycle 34 Core Operating Limits Report The cycle-specific parameter limits for the specifications listed in the Introduction are presented below and listed sequentially by Technical Specification (TS).
These limits have been developed using the NRG-approved methodologies specified in TS 6.9.1.7.
2.1 Reactor Core Safety Limits - Three Loops in Operation (TS 2.1.1)
Figure A1(page 14B-A?)
In Modes 1 and 2, the combination of Thermal Power, reactor coolant system highest loop average temperature and pressurizer pressure shall not exceed the limits in Figure A 1.
2.2 Reactor Trip System Instrumentation Setpoints (TS 2.2.1)
NOTE 1 on TS Table 2.2-1 Overtemperature 11 T 1:1 = Os, 1:2 = Os
't3 = 2s K1 = 1.31 K2 = 0.023/°F
't4 = 25s, 'ts= 3s
'Cs= 2s T':s; 583.0 °F K3 = 0.00116/psi P' ~ 2235 psig Lead/Lag compensator on measured 11 T Lag compensator on measured /1 T Time constants utilized in the lead-lag compensator for Tav9 Lag compensator on measured T avg Indicated Loop Tav9 at RATED THERMAL POWER Nominal RCS operating pressure f1(AI) = 0 for q1 - qb between -18% and+ 7%.
For each percent that the magnitude of q1 - qb exceeds -18%,
the AT Trip Setpoint shall be automatically reduced by 3.51 % of its value at RA TED THERMAL POWER; and For each percent that the magnitude of q1 - qb exceeds +7%, the AT Trip Setpoint shall be automatically reduced by 2.37% of its value at RATED THERMAL POWER.
Where q1 and qb are percent RATED THERMAL POWER in the top and bottom halves of the core respectively, and q1 + qb is total THERMAL POWER in percent of RATED THERMAL POWER.
14B-A3 Revised 04/30/2024
Turkey Point Unit 4 Cycle 34 Core Operating Limits Report NOTE 2 on TS Table 2.2-1 Overtemperature ~T The Overtemperature AT function Allowable Value shall not exceed the nominal trip setpoint by more than 0.5% AT span for the AT channel, 0.2% AT span for the Pressurizer Pressure channel, and 0.4% ATspan for the f(AI) channel. No separate Allowable Value is provided for Tavg because this function is part of the AT value.
NOTE 3 on TS Table 2.2-1 Overpower ~T K4 = 1.09 K5 ~ 0.0/°F K5= 0.0/°F For increasing average temperature For decreasing average temperature
't1~0s Ks= 0.0016/°F Ks= 0.0 Time constants utilized in the lead-lag compensator for T avg For T > T" For T ~ T" T" s; 583.0°F f2 (al)= 0 Indicated Loop Tav9 at RATED THERMAL POWER For all ~I NOTE 4 on TS Table 2.2-1 Overpower ~T The Overpower AT function Allowable Value shall not exceed the nominal trip setpoint by more than 0.5% AT span for the AT channel. No separate Allowable Value is provided for Tavg because this function is part of the AT value.
2.3 Shutdown Margin Limit for MODES 1, 2, 3 and 4 (TS 3.1.1.1)
Figure A2 (page 14B-AS) 2.4 Shutdown Margin Limit for MODE 5 (TS 3.1.1.2)
~ 1.77 % ak/k 14B-A4 Revised 04/30/2024
Turkey Point Unit 4 Cycle 34 Core Operating Limits Report 2.5 Moderator temperature coefficient (MTC) (TS 3.1.1.3)
~ + 5.0 x 10-5 Ak/k/°F BOL, HZP, ARO and from HZP to 70%
Rated Thermal Power (RTP)
From 70% RTP to 100% RTP the MTC decreasing linearly from ~ + 5.0 x 1 o*5 Ak/k/°F to ~ 0.0 x 10-5 Ak/k/°F Less negative than - 41.0 x 10*5 Ak/k/°F EOL, RTP, ARO 2.6 Moderator temperature coefficient (MTC) Surveillance at 300 ppm (TS 4.1.1.3)
Less negative than - 35.0 x 1 o*5 Ak/k/°F (-35 pcm/°F)
Within 7 EFPD of reaching equilibrium boron concentration of 300 ppm.
The Revised Predicted near - EOL 300 ppm MTC shall be calculated using the algorithm contained in WCAP-137 49-P-A:
Revised predicted MTC = Predicted MTC + AFD Correction - 3 pcm/°F If the Revised Predicted MTC is less negative than the SR 4.1.1.3.b 300 ppm surveillance limit and all the benchmark criteria contained in the surveillance procedure are met, then an MTC measurement in accordance with SR 4.1.1.3.b is not required to be performed.
The neutronics methods used with WCAP-13749-P-A are those described in WCAP-16045-P-A, "Qualification of the Two-Dimensional Transport Code PARAGON," August 2004.
2.7 Analog Rod Position Indication System (TS 3.1.3.2)
Figure A3 (page 14B-A9) 2.8 Control Rod Insertion Limits (TS 3.1.3.6)
Figure A3 (page 14B-A9) 2.9 Axial Flux Difference (TS 3.2.1)
Figure A4 (page 14B-A10) 14B-A5 The All Rods Out (ARO) position for all shutdown Banks and Control Banks is defined to be 230 steps K§)
withdrawn.
The control rod banks shall be limited in physical insertion as specified in Figure A3 for ARO = 230 steps 1(§)
withdrawn.
Revised 04/30/2024
Turkey Point Unit 4 Cycle 34 Core Operating Limits Report 2.10 Heat Flux Hot Channel Factor Fo(Z) (TS 3.2.2)
[Fo]L = 2.40 K(z) = 1.0 For 0' ::: z::: 12' where z is core height in ft 2.11 Nuclear Enthalpy Rise Hot Channel Factor (TS 3.2.3)
F l1HRTP = 1.650 PF l1H = 0.3 2.12 DNB Parameters (TS 3.2.5)
RCS Tavg ~ 585.0 °F Pressurizer Pressure~ 2204 psig 14B-A6 Revised 04/30/2024
~
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Figure A1 Reactor Core Safety Limit - Three Loops in Operation Unac<:eptable Operation 02 OA 0.0 8
10 12 Com Power (fraction of 2644 MWt) 14B-A7 Revised 07/21/2016
1.5 1
0.5 Figure A2 Required Shutdown Margin vs Reactor Coolant Boron Concentration
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0 500 1000 1500 2000 RCS BORON CONCENTRATION (PPM) 148-A8 Revised 02/24/2015
230 220 210 200 190 180 170 c 160
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~ 110
!; 100
';;' 90
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~ 70
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Figure A3 Turkey Point Unit 4 Cycle 34 Rod Insertion Limits vs Thermal Power ARO= 230 Steps Withdrawn, Overlap= 102 Steps I./ 64 5 230
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0 10 20 30 40 50 60 70 80 90 100 Percent Reactor Power 14B-A9 Revised 04/30/2024
120 100
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-50 UNAC OPI Figure A4 Axial Flux Difference as a Function of Rated Thermal Power Turkey Point Unit 4 Cycle 34
(-9,100
{+7,100)
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(+20,50)
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10 20 30 40 50 Axial Flux Difference (%)
14B-A10 Revised 04/30/2024