NL-25-0125, Core Operating Limits Report, Cycle 1, Version 2

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Core Operating Limits Report, Cycle 1, Version 2
ML25111A243
Person / Time
Site: Vogtle Southern Nuclear icon.png
Issue date: 04/25/2025
From: Joyce R
Southern Nuclear Operating Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
Shared Package
ML25111A241 List:
References
NL-25-0125 CAW-25-008, SV4-GW-F1-001-NP, Rev. 1
Download: ML25111A243 (1)
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A Southern Nuclear April 21, 2025 Docket No.: 52-026 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant - Unit 4 Core Operating Limits Report, Cycle 1, Version 2 Ladies and Gentlemen:

Southern Nuclear Operating Company, Inc.

3535 Colonnade Parkway Birmingham, AL 35243 NL-25-0125 10 CFR 52.97(c)

In accordance with Technical Specifications (TS) 5.6.3.d for Vogtle Electric Generating Plant (VEGP) Units 3 and 4, Southern Nuclear Operating Company (SNC) submits the VEGP Core Operating Limits Report (COLR) for Unit 4, Cycle 1, Version 2. provides the Non-Proprietary version of the COLR. provides the Proprietary version of the COLR. The enclosure contains Proprietary information; therefore, SNC requests that this enclosure be withheld under the provisions of 10 CFR 2.390. is CAW-25-008, Application for Withholding Proprietary Information from Public Disclosure and Affidavit. Enclosure 2 contains information proprietary to Westinghouse Electric Company LLC ("Westinghouse"); it is supported by an Affidavit signed by Westinghouse, the owner of information. The Affidavit sets forth the basis on which the information may be withheld from public disclosure by the Nuclear Regulatory Commission ("Commission") and addresses with specificity the considerations listed in paragraph (b )(4) of Section 2.390 of the Commission's regulations.

Accordingly, it is respectfully requested that the information that is proprietary to Westinghouse be withheld from public disclosure in accordance with 10 CFR Section 2.390 of the Commission's regulations.

Correspondence with respect to the copyright or proprietary aspects of the items listed above or the supporting Westinghouse Affidavit should reference CAW-25-008 and should be addressed to Jerrod Ewing, Licensing Manager, Westinghouse Electric Company, 1000 Westinghouse Drive, Cranberry Township, Pennsylvania 16066. This letter contains no regulatory commitments.

This letter has been reviewed and determined not to contain security-related information.

If you have any questions, please contact me at 205.992.6468.

U.S. Nuclear Regulatory Commission NL-25-0125 Page 2 of 2 Respectfully submitted, Licensing Manager Southern Nuclear Operating Company

Enclosures:

1) Vogtle Electric Generating Plant (VEGP) Unit 4 - Core Operating Limits Report (COLR), Cycle 1, Version 2 (Non-Proprietary)
2) Vogtle Electric Generating Plant (VEGP) Unit 4 - Core Operating Limits Report (COLR), Cycle 1, Version 2 (Proprietary) (Withheld Information)
3) Vogtle Electric Generating Plant (VEGP) Unit 4 - Westinghouse Application for Withholding Proprietary Information from Public Disclosure CAW-25-008 and accompanying Affidavit cc:

Regional Administrator, Region II Project Manager - VEGP 3&4 Senior Resident Inspector - VEGP 3&4 Document Services RTYPE: VNP.LI.L00

Southern Nuclear Operating Company NL-25-0125 Vogtle Electric Generating Plant (VEGP) Unit 4 Core Operating Limits Report (COLR), Cycle 1, Version 2 (Non-Proprietary)

(This Enclosure consists of 65 pages, including this cover page)

Westinghouse Non-Proprietary Class 3 Core Operating Limits Report (COLR) for the Vogtle Electric Generating Plant, Unit 4 Authored by:

Chandler E. Walker Nuclear Design A Verified by*:

Robert J. Fetterman Reactor Technology and Methods Cycle 1 February 2025

  • Three-pass verification (3PV) was used to verify this document.

Approved by:

Christopher S. Trunick Reactor Technology and Methods

Attachment:

64 pages Electronically Approved Records are Authenticated in the Electronic Document Management System

© 2025 Westinghouse Electric Company LLC All Rights Reserved

@ Westinghouse SV4-GW-F1-001-NP Revision 1 Page A-1 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 VOGTLE ELECTRIC GENERATING PLANT (VEGP)

UNIT 4 CYCLE 1 CORE OPERATING LIMITS REPORT (COLR)

Version 2 February 2025 SV4-GW-F1-001-NP Revision 1 Page A-2 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for the Vogtle Electric Generating Plant, Unit 4, Cycle 1 has been prepared in accordance with the requirements of Technical Specification 5.6.3.

The Technical Specification Safety Limits (SLs) and Limiting Conditions for Operation (LCOs) affected by this report are listed below:

SL 2.1.1 Reactor Core SLs LCO 3.1.1 SHUTDOWN MARGIN (SOM)

LCO 3.1.3 Moderator Temperature Coefficient (MTC)

LCO 3.1.5 Shutdown Bank Insertion Limits LCO 3.1.6 Control Bank Insertion Limits LCO 3.2.1 Heat Flux Hot Channel Factor (Fa(Z)) (Constant Axial Offset Control (CAOC) W(Z) Methodology)

LCO 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F~H)

LCO 3.2.3 AXIAL FLUX DIFFERENCE (AFD) (Constant Axial Offset Control (CAOC) Methodology)

LCO 3.2.5 On-Line Power Distribution Monitoring System (OPDMS)-Monitored Parameters LCO 3.4.1 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB) Limits LCO 3.9.1 Boron Concentration SV4-GW-F1-001-NP Revision 1 Page A-3 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 2.0 2.1 OPERATING LIMITS Reactor Core SLs (SL 2.1.1)

The Reactor Core SLs for MODES 1 and 2 are:

2.1.1 The combination of THERMAL POWER, RCS highest loop cold leg temperature, and pressurizer pressure shall not exceed the limits specified in Table 2.1.1 and Figure 2.1.1.

2.2 SHUTDOWN MARGIN (SOM)

(LCO 3.1.1)

The SOM limit for MODE 2 with kett < 1.0 is:

2.2.1 The SOM shall be greater than or equal to 1.6%.b.k/k.

The SOM limit for MODES 3, 4, and 5 is:

2.2.2 The SOM shall be greater than or equal to 1.6%.b.k/k.

SV4-GW-F1-001-NP Revision 1 Page A-4 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 SV4-GW-F1-001-NP Revision 1 Table 2.1.1 Reactor Core Safety Limits a,c Page A-5 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 SV4-GW-F1-001-NP Revision 1 Figure 2.1.1 Reactor Core Safety Limits a,c Page A-6 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

2.3 Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Moderator Temperature Coefficient (MTC)

(LCO 3.1.3)

The BOL/ARO MTC upper limit for MODE 1 and MODE 2 with kett ~ 1.0 is:

2.3.1 The MTC shall be more negative than or equal to the power-dependent upper limit specified in Figure 2.3.1.

The EOL/ARO MTC lower limit for MODES 1, 2, and 3 is:

2.3.2 The MTC shall be less negative than or equal to

[

]a,c The ARO/HFP MTC surveillance limits for EOL are:

2.3.3 At 300 ppm, the MTC shall be less negative than or equal to

[

]a,c 2.3.4 At 60 ppm, the MTC shall be less negative than or equal to

[

]a,c The measurements to support EOL MTC measurement may be exempted provided both of the following conditions are met:

2.3.5 The measured-to-predicted differences for the parameters listed in Table 2.3.5 are within their specified criteria.

2.3.6 The value of the revised predicted MTC, calculated in accordance with Table 2.3.6, is less negative than the ARO/HFP MTC surveillance limit at 300 ppm.

Note: ARO stands for All Rods Out BOL stands for Beginning of (Cycle) Life EOL stands for End of (Cycle) Life HFP stands for Hot Full (Thermal) Power SV4-GW-F1-001-NP Revision 1 Page A-7 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 SV4-GW-F1-001-NP Revision 1 Figure 2.3.1 BOL/ARO MTC Upper Limit a,c Page A-8 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.3.5 Benchmark Criteria for Application of the EOL MTC Measurement Conditional Exemption Parameter Criteria Ti me/ Activity Power Ascension Testing Assembly Power

+/- 0.10 or 10%

Routinely at RTP

[

]a,c lncore Quadrant

+/-4%

Power Ascension Tilt (Low Power)

Testing Power Ascension lncore Quadrant Testing Tilt (RTP)

+/-2%

Routinely at RTP

[

]a,c Low Power Physics Testing Power Ascension Core Reactivity

+/- 1000 pcm Testing Routine Surveillance Requirement Low Power Physics BOL HZP ITC

+/- 2.0 pcm/°F Testing Individual

+/- 75 pcm Low Power Physics Bank Worth or 10%

Testing Total

+/-5.6%

Low Power Physics Bank Worth Testing Note: EFPD stands for effective full power days EQXE stands for equilibrium xenon HZP stands for Hot Zero (Thermal) Power Minimum Documentation Frequency Twice - At an intermediate power (40-75% RTP) plateau and at a full power (> 90% RTP) plateau Monthly after reaching RTP Once -At a low power(~ 30% RTP) plateau Once - At the RTP power ascension test plateau Monthly after reaching RTP Once - After fuel load and prior to MODE 1 (SR 3.1.2.1)

Once - In MODE 1 upon reaching RTP and EQXE conditions

("Hot Full Power Boron Endpoint")

After 60 EFPD, every 31 EFPD thereafter (continuation of SR 3.1.2.1)

Once - After fuel load and prior to MODE1 (needed to support SR 3.1.3.1)

Once - After fuel load and prior to MODE1 Once - After fuel load and prior to MODE 1 ITC stands for Isothermal Temperature Coefficient OPDMS stands for Online Power Distribution Monitoring System RTP stands for rated thermal power SR stands for surveillance requirement SV4-GW-F1-001-NP Revision 1 Page A-9 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.3.6 Algorithm for Calculation of the Revised Predicted MTC at 300 ppm a,c SV4-GW-F1-001-NP Revision 1 Page A-1 O of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

2.4 Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Shutdown Bank Insertion Limits (LCO 3.1.5)

The shutdown bank insertion limits in MODES 1 and 2 are:

2.4.1 All shutdown banks shall be positioned greater than or equal to [

]a,c steps withdrawn (swd).

2.5 Control Bank Insertion Limits (LCO 3.1.6)

The control bank rod insertion limits (Rlls), sequence limits, and overlap limits in MODE 1 and MODE 2 with kett ~ 1.0 are:

2.5.1 M-Bank Limits 2.5.1.a With the OPDMS functional, the M-Banks shall be positioned greater than or equal to the power-dependent limit specified in Figure 2.5.1.a.

2.5.1.b With the OPDMS not functional, the M-Banks shall be positioned greater than or equal to the power-dependent limit specified in Figure 2.5.1.b.

(Note: The same Rlls apply regardless of OPDMS functionality for this cycle).

2.5.1.c The M-Banks shall be considered fully withdrawn from the core when positioned greater than or equal to [

]a,c swd.

Note: ARO positions of [

]a,c through [

]a,c swd may be utilized during rod repositioning without affecting the core safety analysis.

2.5.1.d When the ARO position is [

]a,c swd, the M-Banks shall be operated in sequence as specified in Table 2.5.1.d, and each M-Bank not fully withdrawn from the core shall be operated within the overlap limits specified in Table 2.5.1.d.

2.5.1.e When the ARO position is [

]a,c swd, the M-Banks shall be operated in sequence as specified in Table 2.5.1.e, and each M-Bank not fully withdrawn from the core shall be operated within the overlap limits specified in Table 2.5.1.e.

2.5.1.f When the ARO position is [

]a,c swd, the M-Banks shall be operated in sequence as specified in Table 2.5.1.f, and each M-Bank not fully withdrawn from the core shall be operated within the overlap limits specified in Table 2.5.1.f.

SV4-GW-F1-001-NP Revision 1 Page A-11 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 2.5.1.g When the ARO position is [

]a,c swd, the M-Banks shall be operated in sequence as specified in Table 2.5.1.g, and each M-Bank not fully withdrawn from the core shall be operated within the overlap limits specified in Table 2.5.1.g.

2.5.2 Bank AO Limits 2.5.2.a Bank AO shall be positioned greater than or equal to the power-dependent limit specified in Figure 2.5.2.a.

2.5.2.b Bank AO shall be considered fully withdrawn from the core when positioned greater than or equal to [

]a,c swd.

SV4-GW-F1-001-NP Revision 1 Page A-12 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 SV4-GW-F1-001-NP Revision 1 Figure 2.5.1.a M-Bank Rod Insertion Limits (OPDMS Functional) a,c Page A-13 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 SV4-GW-F1-001-NP Revision 1 Figure 2.5.1.b M-Bank Rod Insertion Limits (OPDMS Not Functional) a,c Page A-14 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Tabl,e 2.5.1.d M-Bank S,equenoes and Overlap Settin,gs

[ l 11*csteps. ARO SV4-GW-F1-001-NP Revision 1 a,c Page A-15 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.5.1.,e M-Bank Sequences and Overfap Settings I[

]a,csteps ARO a,c Table 2.5.1.f M-Bank Sequences and Overlap Settings I[ ]a,c steps ARO a,c SV4-GW-F1-001-NP Revision 1 Page A-16 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.5.1.g M-Bank Sequences and Overlap Settings

[ ]':i,cstecs ARO SV4-GW-F1-001-NP Revision 1 a,c Page A-17 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Figure 2.5.2.a Bank AO Rod Insertion Limits a,c SV4-GW-F1-001-NP Revision 1 Page A-18 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

2.6 Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Heat Flux Hot Channel Factor (Fo(Z)) (Constant Axial Offset Control (CAOC) W(Z)

Methodology)

(LCO 3.2.1)

The Fa(Z) limits in MODE 1 with THERMAL POWER ~ 25% RTP and with the OPDMS not functional with respect to LCO 3.2.5 a, b, and care:

2.6.1 Fg(Z) :5 c:o for P > 0.5 Fg(Z) :5 c;~ for P :5 0.5 where: p THERMAL POWER

= RATED THERMAL POWER CFQ = 2.60 where: F~ (Z) represents the measured value of F0 (Z), and is obtained from power distribution measurement results.

F~u (Z) is a factor that accounts for fuel manufacturing tolerances (net effect being a factor of 1.03) and power distribution measurement uncertainty, the latter being dependent on the fraction of inoperable incore detectors and the detector measurement variability at the conditions of the power distribution measurement. Therefore, F~u (Z) is defined at the time of measurement per equations (4) and (5) of Reference 1.

2.6.3 F~ (Z) :5 c:o for P > 0.5 F~ (Z) :5 c;~ for P :5 0.5 W(Z) is a cycle-dependent function that accounts for power distribution transients encountered during normal operation:

2.6.3.a The W(Z) function is dependent on core elevation and core burnup, as well as the assumed power level and M-Bank sequence, as specified in Table 2.6.3.a.

[

]a,c 2.6.3.b A Penalty Factor shall be used to increase the F~ (Z) in accordance with Surveillance Requirement 3.2.1.4 as specified in Table 2.6.3.b.

SV4-GW-F1-001-NP Revision 1 Page A-19 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.6.3.a W(Z) Function [

]a,c Core W(Z) Factors by Core Burnup Elevation (in) 150 2000 5000 8000 16000 0.00 1.496 1.483 1.556 1.580 1.585 2.01 1.496 1.483 1.558 1.581 1.576 4.02 1.486 1.474 1.547 1.571 1.569 6.04 1.479 1.467 1.540 1.562 1.546 8.05 1.456 1.445 1.505 1.511 1.505 10.06 1.443 1.433 1.493 1.501 1.495 12.07 1.418 1.416 1.458 1.457 1.476 14.08 1.400 1.403 1.445 1.439 1.463 16.09 1.389 1.380 1.407 1.395 1.444 18.11 1.372 1.365 1.393 1.383 1.430 20.12 1.353 1.349 1.377 1.371 1.411 22.13 1.317 1.330 1.366 1.359 1.392 24.15 1.275 1.304 1.364 1.344 1.368 26.16 1.257 1.267 1.322 1.329 1.346 28.17 1.241 1.242 1.303 1.314 1.330 30.18 1.224 1.229 1.290 1.300 1.303 32.19 1.214 1.215 1.280 1.288 1.282 34.20 1.203 1.206 1.271 1.277 1.266 36.22 1.191 1.190 1.257 1.263 1.250 38.23 1.179 1.177 1.246 1.251 1.236 40.24 1.167 1.165 1.234 1.238 1.222 42.25 1.159 1.150 1.220 1.224 1.220 44.26 1.161 1.149 1.215 1.219 1.238 46.28 1.169 1.152 1.223 1.232 1.267 48.29 1.182 1.157 1.230 1.240 1.298 50.30 1.197 1.166 1.240 1.252 1.333 52.31 1.212 1.176 1.252 1.266 1.368 54.32 1.228 1.187 1.253 1.268 1.387 56.33 1.244 1.200 1.280 1.297 1.428 58.35 1.259 1.203 1.290 1.310 1.459 60.36 1.275 1.213 1.304 1.328 1.490 62.37 1.297 1.227 1.323 1.347 1.516 64.39 1.319 1.240 1.344 1.374 1.549 66.40 1.337 1.245 1.355 1.386 1.570 68.41 1.352 1.248 1.360 1.393 1.580 70.42 1.364 1.251 1.367 1.402 1.592 72.43 1.373 1.262 1.376 1.409 1.599 74.44 1.375 1.269 1.379 1.411 1.586 SV4-GW-F1-001-NP Revision 1 Page A-20 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.6.3.a W(Z) Function [

]a,c Core W(Z) Factors by Core Burnup Elevation (in) 150 2000 5000 8000 16000 76.46 1.386 1.282 1.397 1.432 1.597 78.47 1.393 1.293 1.409 1.447 1.597 80.48 1.396 1.301 1.422 1.462 1.607 82.49 1.401 1.309 1.434 1.473 1.615 84.50 1.404 1.323 1.447 1.482 1.621 86.52 1.402 1.331 1.454 1.486 1.617 88.53 1.410 1.341 1.459 1.488 1.614 90.54 1.414 1.351 1.460 1.484 1.604 92.55 1.419 1.360 1.459 1.479 1.598 94.56 1.439 1.379 1.460 1.469 1.596 96.57 1.423 1.373 1.462 1.470 1.589 98.59 1.411 1.363 1.462 1.473 1.575 100.60 1.403 1.361 1.462 1.473 1.567 102.61 1.391 1.356 1.456 1.465 1.550 104.62 1.380 1.355 1.452 1.458 1.533 106.64 1.357 1.337 1.437 1.444 1.511 108.65 1.334 1.320 1.419 1.429 1.488 110.66 1.307 1.305 1.402 1.410 1.459 112.67 1.277 1.295 1.395 1.387 1.430 114.68 1.261 1.297 1.401 1.371 1.406 116.70 1.235 1.272 1.361 1.331 1.356 118.71 1.214 1.250 1.328 1.304 1.325 120.72 1.198 1.232 1.295 1.273 1.305 122.73 1.202 1.215 1.253 1.239 1.286 124.74 1.221 1.228 1.245 1.215 1.268 126.76 1.221 1.219 1.221 1.202 1.244 128.77 1.229 1.217 1.210 1.203 1.226 130.78 1.213 1.213 1.212 1.208 1.213 132.79 1.194 1.216 1.230 1.216 1.201 134.80 1.188 1.206 1.223 1.225 1.208 136.81 1.204 1.214 1.230 1.240 1.229 138.83 1.217 1.226 1.239 1.247 1.240 140.84 1.236 1.244 1.252 1.256 1.254 142.85 1.253 1.262 1.267 1.263 1.269 144.86 1.273 1.280 1.282 1.272 1.282 146.88 1.294 1.304 1.304 1.283 1.295 148.89 1.319 1.328 1.324 1.297 1.317 150.90 1.344 1.353 1.346 1.315 1.353 SV4-GW-F1-001-NP Revision 1 Page A-21 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Table 2.6.3.a W(Z) Function [

]a,c Core W(Z) Factors by Core Burnup Elevation (in) 150 2000 5000 8000 16000 152.91 1.383 1.391 1.377 1.354 1.377 154.92 1.427 1.425 1.403 1.394 1.413 156.94 1.466 1.446 1.446 1.425 1.458 158.95 1.475 1.463 1.445 1.430 1.479 160.96 1.495 1.488 1.479 1.473 1.515 162.97 1.466 1.472 1.480 1.485 1.539 164.98 1.477 1.484 1.493 1.499 1.558 167.00 1.496 1.495 1.498 1.507 1.569 169.01 1.509 1.508 1.509 1.512 1.575 Notes:

The W(Z) values are unit-less and the core burnup values are in units of MWD/MTU.

. [

The top and bottom 8% of the core (inclusive) are excluded from the F~ (Z) evaluation because of the difficulty of making a precise measurement in these regions and because of the low probability that these regions would be more limiting than the safety analyses.

Table 2.6.3.b F~ (Z) Penalty Factors Burnup Fi(z)

(MWD/MTU)

Penalty Factor 0

1.02 18662 1.02 SV4-GW-F1-001-NP Revision 1 Page A-22 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

2.7 Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Nuclear Enthalpy Rise Hot Channel Factor (F~H)

(LCO 3.2.2)

The F~H limits in MODE 1 with THERMAL POWER ~ 25% RTP and with the OPDMS not functional with respect to LCO 3.2.5 a, b, and care:

2.7.1 F~H= F~~P * (1 + PFtiH * (1 - P))

where: p THERMAL POWER

= RATED THERMAL POWER PF tiH = 0.3 2.8 AXIAL FLUX DIFFERENCE (AFD) (Constant Axial Offset Control (CAOC)

Methodology)

(LCO 3.2.3)

The AFD limits in MODE 1 with THERMAL POWER > 15% RTP and with the OPDMS not functional with respect to LCO 3.2.5 a, b, and care:

2.8.1 The AFD shall be maintained within the target band of [

the target flux difference.

]a,c AFD about 2.8.2 The AFD may deviate outside the target band with THERMAL POWER < 90%

RTP but~ 50% RTP, provided AFD is within the acceptable operation limits specified in Figure 2.8.2.

SV4-GW-F1-001-NP Revision 1 Page A-23 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 Figure 2.8.2 Axial Flux Difference Acceptable Operation Limits a,c SV4-GW-F1-001-NP Revision 1 Page A-24 of 64

      • This record was final approved on 03/05/2025 11: 18:44. (This statement was added by the PRIME system upon its validation)

2.9 Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 On-Line Power Distribution Monitoring System (OPDMS)-Monitored Parameters (LCO 3.2.5) 2.9.1 The Peak Linear Heat Rate (PLHR) shall not exceed [

]a,c as confirmed by Minimum Power Margin (MPM) > 0.0%, in MODE 1 with THERMAL POWER ~ 25% RTP and with the OPDMS functional.

Note: The PLHR limit presented here is based on the hot fuel height.

2.9.2 The Nuclear Enthalpy Rise Hot Channel Factor (F~H) shall not exceed its limits, as confirmed by MPM > 0.0%, in MODE 1 with THERMAL POWER

~ 25% RTP and with the OPDMS functional. The F~H limits are:

F~H= F~~P * (1 + PFtiH * (1 - P))

where: p THERMAL POWER

= RATED THERMAL POWER PF tiH = 0.3 2.9.3 The Departure from Nucleate Boiling Ratio (DNBR) shall be maintained greater than or equal to [

]a,c as confirmed by MPM > 0.0%, in MODE 1 with THERMAL POWER ~ 25% RTP and with the OPDMS functional.

2.9.4 The SHUTDOWN MARGIN (SOM) shall be greater than or equal 1.6%.b.k/k, as confirmed by Excess Shutdown Margin > 0.0 ppm RCS boron concentration, in MODE 1 with the OPDMS functional and in MODE 2 with kett ~ 1.0 with the OPDMS functional.

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Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1 2.10 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling (DNB)

Limits (LCO 3.4.1)

The RCS DNB parameter limits are:

2.10.1 The Pressurizer Pressure shall be maintained greater than or equal to

[

]a,c in MODE 1.

2.10.2 The RCS Average Temperature (Tav9) shall be maintained less than or equal to

[

]a,c in MODE 1.

2.10.3 The RCS total flow rate shall be maintained greater than or equal to 301,670 gpm in MODE 1.

2.11 Boron Concentration (LCO 3.9.1)

The limit in MODE 6 for the boron concentration of the RCS, the fuel transfer canal (when connected to the RCS), and the refueling cavity (when connected to the RCS) is:

2.11.1 The boron concentration shall be maintained greater than or equal to

[

]a,c Note: The limit bounds the BOL condition of kett::; 0.95 (all Rod Control Cluster Assemblies inserted, all Gray Rod Control Assemblies withdrawn) and subcriticality (all rods withdrawn) over the entire cycle. This limit includes additional boron to address uncertainties and B10 depletion.

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Westinghouse Non-Proprietary Class 3 CORE OPERATING LIMITS REPORT FOR VOGTLE UNIT 4 CYCLE 1

3.0 REFERENCES

1. WCAP-12472-P-A, BEACON' Core Monitoring and Operations Support System, Addendum 1, May 1996 (Westinghouse Proprietary).

BEACON is a trademark or registered trademark of Westinghouse Electric Company LLC, its Affiliates and/or its Subsidiaries in the United States of America and may be registered in other countries throughout the world. All rights reserved. Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners.

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Southern Nuclear Operating Company NL-25-0125 Vogtle Electric Generating Plant (VEGP) Unit 4 Westinghouse Application for Withholding Proprietary Information from Public Disclosure CAW-25-008 and accompanying Affidavit (This Enclosure consists of 4 pages, including this cover page)

Commonwealth of Pennsylvania:

County of Butler:

Westinghouse Non-Proprietary Class 3 AFFIDAVIT CAW-25-008 (1)

I, Zachary Harper, Consulting Engineer, Licensing, have been specifically delegated and authorized to apply for withholding and execute this Affidavit on behalf of Westinghouse Electric Company LLC (Westinghouse).

(2)

I am requesting the proprietary portions of SV 4-GW-Fl-001, Revision l be withheld from public disclosure under l 0 CFR 2.390.

(3)

I have personal knowledge of the criteria and procedures utilized by Westinghouse in designating information as a trade secret, privileged, or as confidential commercial or financial information.

Page 1 of3 (4)

Pursuant to 10 CFR 2.390, the following is furnished for consideration by the Commission in determining whether the information sought to be withheld from public disclosure should be withheld.

(i)

The information sought to be withheld from public disclosure is owned and has been held in confidence by Westinghouse and is not customarily disclosed to the public.

(ii)

The information sought to be withheld is being transmitted to the Commission in confidence and, to Westinghouse's knowledge, is not available in public sources.

(iii)

Westinghouse notes that a showing of substantial harm is no longer an applicable criterion for analyzing whether a document should be withheld from public disclosure. Nevertheless, public disclosure of this proprietary information is likely to cause substantial harm to the competitive position of Westinghouse because it would enhance the ability of competitors to provide similar technical evaluation justifications and licensing defense services for commercial power reactors without commensurate expenses. Also, public disclosure of the information would enable others to use the information to meet NRC requirements for licensing documentation without purchasing the right to use the information.

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Westinghouse Non-Proprietary Class 3 AFFIDAVIT CAW-25-008 (5)

Westinghouse has policies in place to identify proprietary information. Under that system, information is held in confidence if it falls in one or more of several types, the release of which might result in the loss of an existing or potential competitive advantage, as follows:

(a)

The information reveals the distinguishing aspects of a process ( or component, structure, tool, method, etc.) where prevention of its use by any of Westinghouse's competitors without license from Westinghouse constitutes a competitive economic advantage over other companies.

Page 2 of3 (b)

It consists of supporting data, including test data, relative to a process ( or component, structure, tool, method, etc.), the application of which data secures a competitive economic advantage (e.g., by optimization or improved marketability).

( c)

Its use by a competitor would reduce his expenditure of resources or improve his competitive position in the design, manufacture, shipment, installation, assurance of quality, or licensing a similar product.

( d)

It reveals cost or price information, production capacities, budget levels, or commercial strategies of Westinghouse, its customers or suppliers.

(e)

It reveals aspects of past, present, or future Westinghouse or customer funded development plans and programs of potential commercial value to Westinghouse.

(f)

It contains patentable ideas, for which patent protection may be desirable.

(6)

The attached documents are bracketed and marked to indicate the bases for withholding. The justification for withholding is indicated in both versions by means of lower-case letters (a) through (f) located as a superscript immediately following the brackets enclosing each item of information being identified as proprietary or in the margin opposite such information. These lower-case letters refer to the types of information Westinghouse customarily holds in confidence identified in Sections (5)(a) through (f) of this Affidavit.

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Westinghouse Non-Proprietary Class 3 AFFIDAVIT CAW-25-008 I declare that the averments of fact set forth in this Affidavit are true and correct to the best of my knowledge, information, and belief. I declare under penalty of perjury that the foregoing is true and correct.

Executed on: 2/28/2025 Zachary Harper, Consulting Engineer, Licensing Page 3 of3

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