NL-16-0597, Cycle 19 Core Operating Limits Report, Version 2

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Cycle 19 Core Operating Limits Report, Version 2
ML16111A249
Person / Time
Site: Vogtle Southern Nuclear icon.png
Issue date: 04/20/2016
From: Pierce C
Southern Co, Southern Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-16-0597
Download: ML16111A249 (16)
v • d • e


Text

Charles A. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35242 Tel 205.992.7872 SOUTHERN << \

Fax 205.992.7601 NUCLEAR A SOUTHERN COMPANY APR 2 0 2016 Docket Nos.: 50-425 NL-16-0597 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant, Unit 2 Cycle 19 Core Operating Limits Report Version 2 Ladies and Gentlemen:

In accordance with Technical Specification 5.6.5.d, Southern Nuclear Operating Company (SNC) submits the enclosed Core Operating Limits Report (COLR) for Vogtle Electric Generating Plant, Unit 2 Cycle 19. Please note that the COLR was incremented to Version 2 to maintain consistency with the Reload Evaluation (RE) version number.

The RE was revised to correct an error in a drawing number which did not affect the COLR. There were no changes made to Version 1 of the COLR.

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

C. R. Pierce Regulatory Affairs Director CPRIRMJ

Enclosure:

Unit 2 Cycle 19 Core Operating Limits Report cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bast, Executive Vice President & Chief Nuclear Officer Mr. D. R. Madison, Vice President- Fleet Operations Mr. M. D. Meier, Vice President- Regulatory Affairs Mr. B. K. Taber, Vice President- Vogtle 1 & 2 Mr. B. J. Adams, Vice President- Engineering Mr. G.W. Gunn, Regulatory Affairs Manager- Vogtle 1 & 2 RType: CVC7000 U.S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager- Vogtle 1 & 2 Mr. W. D. Deschaine, Senior Resident Inspector- Vogtle 1 & 2

Vogtle Electric Generating Plant, Unit 2 Cycle 19 Core Operating Limits Report Version 2 Enclosure Unit 2 Cycle 19 Core Operating Limits Report

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE 19 CORE OPERATING LIMITS REPORT Version 2 December 2015

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE I9 DECEMBER 2015 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 Cycle 19 has been prepared in accordance with the requirements of Technical Specification 5.6.5.

The Technical Requirement affected by this report is listed below:

13.1.1 SHUTDOWN MARGIN -MODES 1 and 2 The Technical Specifications affected by this report are listed below:

3.1.1 SHUTDOWN MARGIN - MODES 3, 4 and 5 3.1.3 Moderator Temperature Coefficient 3.1.5 Shutdown Bank Insertion Limits 3.1.6 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor - Fo(Z) 3.2.2 Nuclear Enthalpy Rise Hot Channnel Factor- FN t>H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the following subsections. These limits have been developed using NRC-approved methodologies including those specified in Technical Specification 5.6.5.

2.1 SHUTDOWN MARGIN - MODES 1 and 2 (Technical Requirement 13.1 .1) 2.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent ~klk.

2.2 SHUTDOWN MARGIN - MODES 3, 4 and 5 (Specification 3.1.1) 2.2.1 The SHUTDOWN MARGIN shall be greater than or equal to the limits shown in Figures 1 and 2.

Page 2 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.3 Moderator Temperature Coefficient (Specification 3.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOLlARO/HZP-MTC shall be less positive than +0. 7 x I 04 ~klk/°F for power levels up to 70% RTP with a linear ramp to 0 ~klk/°F at 100% RTP.

The EOLIARO/RTP-MTC shall be less negative than -5.50 x 104 ~klk/°F. 1 2.3.2 The MTC Surveillance limits are:

The 300 pprn/AROIRTP-MTC should be less negative than or equal to

-4.75 X 104 ~klk/°F. 1 The revised predicted near-EOL 300 ppm MTC shall be calculated using Figure 6 and the following algorithm:

Revised Predicted MTC Predicted MTC* + AFD Correction** + Predictive Correction***

where,

  • Predicted MTC is calculated from Figure 6 at the bumup corresponding to the measurement of300 ppm at RTP conditions,
    • AFD Correction is the more negative value of:

{0 pcrn/°F or (~AFD

  • AFD Sensitivity)}

where: ~AFD is the measured AFD minus the predicted AFD from an incore flux map taken at or near the bumup corresponding to 300 ppm, AFD Sensitivity = 0.08 pcrn/oF I ~AFD

      • Predictive Correction is -3 pcrn/°F.

The 60 pprn/AROIRTP-MTC should be less negative than -5.35 x 104 ~klk/°F. 1 where: BOL stands for Beginning of Cycle Life ARO stands for All Rods Out HZP stands for Hot Zero THERMAL POWER EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER 1

Applicable for full-power T-average of 583.8 to 586.8 °F.

Page 3 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.4 Shutdown Bank Insertion Limits (Specification 3.1.5) 2.4.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps.

2.5 Control Bank Insertion Limits (Specification 3.1.6) 2.5.1 The control rod banks shall be limited in physical insertion as shown in Figure 3.

2.6 Heat Flux Hot Channel Factor- FQ(Z) (Specification 3.2.1)

FRTP 2.6.1 F 0 (Z) ~ _Q_

  • K(Z) for P > 0.5

- p FRTP FQ (Z) ~ _.2.__

  • K(Z) for P ~ 0.5 0.5 THERMAL POWER where: p =----------

RATED THERMAL POWER 2.6.2 2.6.3 K(Z) is provided in Figure 4.

FRTP. K(Z) 2.6.4 F (Z) < Q for P > 0.5 Q - P*W(Z)

FRTP. K(Z)

F (Z) < Q for P ~ 0.5 Q - 0.5

  • W(Z) 2.6.5 W(Z) values are provided in Table 2.

2.6.6 The FQ(Z) penalty factors are provided in Table 1.

Page 4 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.7 Nuclear Enthalpy Rise Hot Channel Factor- FNllH (Specification 3.2.2) 2.7.1 F~ ~F::P *(l+PFMf *(1-P))

THERMAL POWER where: p =-----------

RATED THERMAL POWER 2.7.2 Ft:P =1.65 2.7.3 PFMf =0.3 2.8 Axial Flux Difference (Specification 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Acceptable Operation Limits are provided in Figure 5.

2.9 Boron Concentration (Specification 3.9.1) 2.9.1 The boron concentration shall be greater than or equal to 1817 ppm. 2 2

This concentration bounds the condition of kerr~ 0.95 (all rods in less the most reactive rod) and subcriticality (all rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B 10 depletion.

Page 5 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 Table 1 Fo(Z) PENALTY FACTOR Cycle Burnup FQ(Z) Penalty Factor (MWD/MTU) 0 1.0206 150 1.0206 368 1.0289 585 1.0288 803 1.0277 1021 1.0264 1238 1.0253 1456 1.0249 1674 1.0200 Notes:

1. The Penalty Factor, to be applied to FQ(Z) in accordance with SR 3.2.1.2, is the maximum factor by which FQ(Z) is expected to increase over a 39 EFPD interval (surveillance interval of 31 EFPD plus the maximum allowable extension not to exceed 25% of the surveillance interval per SR 3.0.2) starting from the burnup at which the FQ(Z) was determined.
2. Linear interpolation is adequate for intermediate cycle burnups.
3. For all cycle bumups outside the range of the table, a penalty factor of 1.020 shall be used.

Page 6 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 Table 2 RAOCW(Z)

Axial Elevation ISO 4000 12000 20000 Point (feet) MWD/MTU MWD/MTU MWD/MTU MWD/MTU 1-5 12.072- 11.267 1.0000 1.0000 I 0000 I 0000 6 11.066 1.3491 14036 1.2718 12176 7 10.865 1.3360 1.390 I 1.2657 I 2183 8 10.664 13198 I 3784 I 2559 I 2000 9 10.462 1.3045 I 3652 1.2430 I 1891 10 10.261 I 2874 1.3434 I 2296 I 1886 II 10.060 1.2640 L3163 I 2144 I 1881 12 9.859 1.2596 1.3056 I 2032 I 1873 13 9.658 1.2633 I 3001 I 1961 I 1860 14 9.456 12629 1.2893 I 1889 I 1843 15 9.255 1.2542 I 2786 I 1820 1.1851 16 9.054 1.2460 1.2643 1.1785 I 1996 17 8.853 1.2434 I 2437 I 1734 1.2030 18 8.652 1.2388 I 2282 I 1714 1.2134 19 8.450 I 2405 I 2234 I 1793 I 2249 20 8.249 I 2417 I 2134 I 1857 I 2367 21 8.048 I 2414 I 2121 I 1902 I 2481 22 7.847 I 2425 I 2084 I 1929 1.2582 2J 7.646 I 2413 I 2023 I 1935 I 2699 24 7.444 I 2381 1.1948 1.1930 1.2790 25 7.243 I 2318 I 1845 1.1894 I 2830 26 7.042 I 2236 I 1726 I 1838 1.2832 21 6.841 1.2138 1.1598 I 1772 I 2813 28 6.640 I 2017 I 1456 I 1699 I 2768 29 6.438 I 1887 I 1318 1.1635 I 2697 30 6.237 1.1760 I 1276 1.1571 I 2600 31 6.036 I 1644 I 1240 I 1501 I 2483 32 5.835 I 1553 I 1194 1.1422 I 2375 33 5.634 1.1488 I 1146 I 1408 I 2299 34 5.432 1.1434 I 1141 I 1501 I 2219 35 5.231 I 1423 1.1200 I 1587 I 2227 36 5.030 I 1410 I 1278 I 1665 I 2238 37 4.829 I 1443 I 1350 1.1733 1.2254 38 4.628 1.1480 I 1418 I 1792 1.2256 39 4.426 I 1510 I 1481 1.1841 I 2239 40 4.225 I 1529 I 1533 I 1878 I 2206 41 4.024 1.1539 I 1593 I 1902 1.2159 42 3.823 1.1540 I 1669 1.1929 I 2084 43 3.622 1.1553 I 1740 I 1971 I 1985 44 3.420 I 1596 1.1799 1.2010 1.1879 45 3.219 I 1641 1.1853 I 2031 I 1783 46 3.018 1.1666 I 1878 I 2083 1.1784 47 2.817 1.1756 12039 1.2144 1.1896 48 2.616 1.1876 I 2282 I 2255 I 2025 49 2.414 I 1989 I 2522 I 2385 I 2151 50 2.213 1.2102 1.2768 1.2513 1.2218 51 2.012 1.2215 I 3013 I 2633 I 2386 52 1.811 I 2334 1.3255 1.2749 1.2488 53 1.610 1.2468 I 3484 1.2863 1.2595 54 1.408 1.2600 I 3699 I 2975 1.2705 55 1.207 1.2726 I 3899 I 3082 1.2815 56 1.006 1.2846 14081 I 3184 1.2928 57-61 0.805- 0.000 1.0000 I 0000 1.0000 1.0000 Top and Bottom 5 Points Excluded per Technical Specification 83.2.1.

These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 583.8 to 586.8°F.

Page 7 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING) 5.0 4.0 ACCEPTABLE OPERATING REGION

~

~

......... (2 001 .1 P>

~

REQUIRED SHUTDOWN MARGINj v v vv

~ (1 00 I ' .2 fJ) v~""

~ /

v

2. 0

~

I'll v v

. . .v !UNACCEPTABLE OPERATING REGIONj

( ~5( I . ~ 0) 1.0 0.0 0 500 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)

Page 8 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE) v 5.0 (2 00, *9 eY

..,V v /

4.0 vv

!ACCEPTABLE OPERATING REGION I

/

v

/v

.!oe v

v

.!oe /

0 /

0 10 20 30 40 50 60 70 80 90 1 0 POWER (% of Rated Thermal Power)

  • Fully withdrawn shall be the condition where control rods are at a position within the interval ~ 225 and ::::; 231 steps withdrawn.

NOTE: The Rod Bank Insertion Limits are based on the control bank withdrawal sequence A, B, C, D and a control bank tip-to-tip distance of 115 steps.

Page 10 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE4 K(Z)- NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1.4 1.2 p;

0 E:-1 u

~ 1. 0

~

H -

~ FQ = 2.50 Po 0. 8

~ CORE t-::1 H HT. K(Z)

~ 0.6

~

0.00 1. 00 6.00 1. 00 12.0 .925

~

t-::1

~

0.4 0.2 0.0 0 2 4 6 8 10 12 CORE HEIGHT (feet)

Page 11 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURES AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF %RATED THERMAL POWER FORRAOC 120 110

(-15, 100) (+10, 100) 100

...... I ~

H Q) 90 u ~AC EP' ABlE I \ UN CCI PTP [BLE

~

Po II \

80 ~

a I \

I \

Q)

A ArcE PTAJ LE E-4 70 II

'd ~

\

I Q)

CIS 60

\

p:

16-1 I 0

dP so l 1\

p:

l ( -30, 50) I (+26, 50)

~

Po 40 30 20 10 0

-so -40 -30 -20 -10 0 10 20 30 40 so AXIAL FLUX DIFFERENCE (percent ~I)

Page 12 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE6 PREDICTED HFP 300 PPM MTC VS CYCLE BURNUP

-27 . 5

~

0 El

~

0 11.

.j.l

~

~

  • a - 28 . o

' i' '

OJ

  • ri OJ 0

u ~

OJ ......

1-l Bnl ~~

1-l

!t -28 . 5 ~

m ..... ~

E-t 1-l Bnl 1-l

~

~

-29 . 0 17000 1 8000 19000 20000 21000 Cycle Burnup (MWD/MTU)

Moderator Temperature Cycle Burnup Coefficient (MWD/MTU) (pcmjDF) 17000 -27.52 18000 -27.78 19000 -28.06 20000 -28.32 21000 -28.58 Page 13 of13

Charles A. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35242 Tel 205.992.7872 SOUTHERN << \

Fax 205.992.7601 NUCLEAR A SOUTHERN COMPANY APR 2 0 2016 Docket Nos.: 50-425 NL-16-0597 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant, Unit 2 Cycle 19 Core Operating Limits Report Version 2 Ladies and Gentlemen:

In accordance with Technical Specification 5.6.5.d, Southern Nuclear Operating Company (SNC) submits the enclosed Core Operating Limits Report (COLR) for Vogtle Electric Generating Plant, Unit 2 Cycle 19. Please note that the COLR was incremented to Version 2 to maintain consistency with the Reload Evaluation (RE) version number.

The RE was revised to correct an error in a drawing number which did not affect the COLR. There were no changes made to Version 1 of the COLR.

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

C. R. Pierce Regulatory Affairs Director CPRIRMJ

Enclosure:

Unit 2 Cycle 19 Core Operating Limits Report cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bast, Executive Vice President & Chief Nuclear Officer Mr. D. R. Madison, Vice President- Fleet Operations Mr. M. D. Meier, Vice President- Regulatory Affairs Mr. B. K. Taber, Vice President- Vogtle 1 & 2 Mr. B. J. Adams, Vice President- Engineering Mr. G.W. Gunn, Regulatory Affairs Manager- Vogtle 1 & 2 RType: CVC7000 U.S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager- Vogtle 1 & 2 Mr. W. D. Deschaine, Senior Resident Inspector- Vogtle 1 & 2

Vogtle Electric Generating Plant, Unit 2 Cycle 19 Core Operating Limits Report Version 2 Enclosure Unit 2 Cycle 19 Core Operating Limits Report

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE 19 CORE OPERATING LIMITS REPORT Version 2 December 2015

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE I9 DECEMBER 2015 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 Cycle 19 has been prepared in accordance with the requirements of Technical Specification 5.6.5.

The Technical Requirement affected by this report is listed below:

13.1.1 SHUTDOWN MARGIN -MODES 1 and 2 The Technical Specifications affected by this report are listed below:

3.1.1 SHUTDOWN MARGIN - MODES 3, 4 and 5 3.1.3 Moderator Temperature Coefficient 3.1.5 Shutdown Bank Insertion Limits 3.1.6 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor - Fo(Z) 3.2.2 Nuclear Enthalpy Rise Hot Channnel Factor- FN t>H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the following subsections. These limits have been developed using NRC-approved methodologies including those specified in Technical Specification 5.6.5.

2.1 SHUTDOWN MARGIN - MODES 1 and 2 (Technical Requirement 13.1 .1) 2.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent ~klk.

2.2 SHUTDOWN MARGIN - MODES 3, 4 and 5 (Specification 3.1.1) 2.2.1 The SHUTDOWN MARGIN shall be greater than or equal to the limits shown in Figures 1 and 2.

Page 2 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.3 Moderator Temperature Coefficient (Specification 3.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOLlARO/HZP-MTC shall be less positive than +0. 7 x I 04 ~klk/°F for power levels up to 70% RTP with a linear ramp to 0 ~klk/°F at 100% RTP.

The EOLIARO/RTP-MTC shall be less negative than -5.50 x 104 ~klk/°F. 1 2.3.2 The MTC Surveillance limits are:

The 300 pprn/AROIRTP-MTC should be less negative than or equal to

-4.75 X 104 ~klk/°F. 1 The revised predicted near-EOL 300 ppm MTC shall be calculated using Figure 6 and the following algorithm:

Revised Predicted MTC Predicted MTC* + AFD Correction** + Predictive Correction***

where,

  • Predicted MTC is calculated from Figure 6 at the bumup corresponding to the measurement of300 ppm at RTP conditions,
    • AFD Correction is the more negative value of:

{0 pcrn/°F or (~AFD

  • AFD Sensitivity)}

where: ~AFD is the measured AFD minus the predicted AFD from an incore flux map taken at or near the bumup corresponding to 300 ppm, AFD Sensitivity = 0.08 pcrn/oF I ~AFD

      • Predictive Correction is -3 pcrn/°F.

The 60 pprn/AROIRTP-MTC should be less negative than -5.35 x 104 ~klk/°F. 1 where: BOL stands for Beginning of Cycle Life ARO stands for All Rods Out HZP stands for Hot Zero THERMAL POWER EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER 1

Applicable for full-power T-average of 583.8 to 586.8 °F.

Page 3 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.4 Shutdown Bank Insertion Limits (Specification 3.1.5) 2.4.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps.

2.5 Control Bank Insertion Limits (Specification 3.1.6) 2.5.1 The control rod banks shall be limited in physical insertion as shown in Figure 3.

2.6 Heat Flux Hot Channel Factor- FQ(Z) (Specification 3.2.1)

FRTP 2.6.1 F 0 (Z) ~ _Q_

  • K(Z) for P > 0.5

- p FRTP FQ (Z) ~ _.2.__

  • K(Z) for P ~ 0.5 0.5 THERMAL POWER where: p =----------

RATED THERMAL POWER 2.6.2 2.6.3 K(Z) is provided in Figure 4.

FRTP. K(Z) 2.6.4 F (Z) < Q for P > 0.5 Q - P*W(Z)

FRTP. K(Z)

F (Z) < Q for P ~ 0.5 Q - 0.5

  • W(Z) 2.6.5 W(Z) values are provided in Table 2.

2.6.6 The FQ(Z) penalty factors are provided in Table 1.

Page 4 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 2.7 Nuclear Enthalpy Rise Hot Channel Factor- FNllH (Specification 3.2.2) 2.7.1 F~ ~F::P *(l+PFMf *(1-P))

THERMAL POWER where: p =-----------

RATED THERMAL POWER 2.7.2 Ft:P =1.65 2.7.3 PFMf =0.3 2.8 Axial Flux Difference (Specification 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Acceptable Operation Limits are provided in Figure 5.

2.9 Boron Concentration (Specification 3.9.1) 2.9.1 The boron concentration shall be greater than or equal to 1817 ppm. 2 2

This concentration bounds the condition of kerr~ 0.95 (all rods in less the most reactive rod) and subcriticality (all rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B 10 depletion.

Page 5 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 Table 1 Fo(Z) PENALTY FACTOR Cycle Burnup FQ(Z) Penalty Factor (MWD/MTU) 0 1.0206 150 1.0206 368 1.0289 585 1.0288 803 1.0277 1021 1.0264 1238 1.0253 1456 1.0249 1674 1.0200 Notes:

1. The Penalty Factor, to be applied to FQ(Z) in accordance with SR 3.2.1.2, is the maximum factor by which FQ(Z) is expected to increase over a 39 EFPD interval (surveillance interval of 31 EFPD plus the maximum allowable extension not to exceed 25% of the surveillance interval per SR 3.0.2) starting from the burnup at which the FQ(Z) was determined.
2. Linear interpolation is adequate for intermediate cycle burnups.
3. For all cycle bumups outside the range of the table, a penalty factor of 1.020 shall be used.

Page 6 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 Table 2 RAOCW(Z)

Axial Elevation ISO 4000 12000 20000 Point (feet) MWD/MTU MWD/MTU MWD/MTU MWD/MTU 1-5 12.072- 11.267 1.0000 1.0000 I 0000 I 0000 6 11.066 1.3491 14036 1.2718 12176 7 10.865 1.3360 1.390 I 1.2657 I 2183 8 10.664 13198 I 3784 I 2559 I 2000 9 10.462 1.3045 I 3652 1.2430 I 1891 10 10.261 I 2874 1.3434 I 2296 I 1886 II 10.060 1.2640 L3163 I 2144 I 1881 12 9.859 1.2596 1.3056 I 2032 I 1873 13 9.658 1.2633 I 3001 I 1961 I 1860 14 9.456 12629 1.2893 I 1889 I 1843 15 9.255 1.2542 I 2786 I 1820 1.1851 16 9.054 1.2460 1.2643 1.1785 I 1996 17 8.853 1.2434 I 2437 I 1734 1.2030 18 8.652 1.2388 I 2282 I 1714 1.2134 19 8.450 I 2405 I 2234 I 1793 I 2249 20 8.249 I 2417 I 2134 I 1857 I 2367 21 8.048 I 2414 I 2121 I 1902 I 2481 22 7.847 I 2425 I 2084 I 1929 1.2582 2J 7.646 I 2413 I 2023 I 1935 I 2699 24 7.444 I 2381 1.1948 1.1930 1.2790 25 7.243 I 2318 I 1845 1.1894 I 2830 26 7.042 I 2236 I 1726 I 1838 1.2832 21 6.841 1.2138 1.1598 I 1772 I 2813 28 6.640 I 2017 I 1456 I 1699 I 2768 29 6.438 I 1887 I 1318 1.1635 I 2697 30 6.237 1.1760 I 1276 1.1571 I 2600 31 6.036 I 1644 I 1240 I 1501 I 2483 32 5.835 I 1553 I 1194 1.1422 I 2375 33 5.634 1.1488 I 1146 I 1408 I 2299 34 5.432 1.1434 I 1141 I 1501 I 2219 35 5.231 I 1423 1.1200 I 1587 I 2227 36 5.030 I 1410 I 1278 I 1665 I 2238 37 4.829 I 1443 I 1350 1.1733 1.2254 38 4.628 1.1480 I 1418 I 1792 1.2256 39 4.426 I 1510 I 1481 1.1841 I 2239 40 4.225 I 1529 I 1533 I 1878 I 2206 41 4.024 1.1539 I 1593 I 1902 1.2159 42 3.823 1.1540 I 1669 1.1929 I 2084 43 3.622 1.1553 I 1740 I 1971 I 1985 44 3.420 I 1596 1.1799 1.2010 1.1879 45 3.219 I 1641 1.1853 I 2031 I 1783 46 3.018 1.1666 I 1878 I 2083 1.1784 47 2.817 1.1756 12039 1.2144 1.1896 48 2.616 1.1876 I 2282 I 2255 I 2025 49 2.414 I 1989 I 2522 I 2385 I 2151 50 2.213 1.2102 1.2768 1.2513 1.2218 51 2.012 1.2215 I 3013 I 2633 I 2386 52 1.811 I 2334 1.3255 1.2749 1.2488 53 1.610 1.2468 I 3484 1.2863 1.2595 54 1.408 1.2600 I 3699 I 2975 1.2705 55 1.207 1.2726 I 3899 I 3082 1.2815 56 1.006 1.2846 14081 I 3184 1.2928 57-61 0.805- 0.000 1.0000 I 0000 1.0000 1.0000 Top and Bottom 5 Points Excluded per Technical Specification 83.2.1.

These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 583.8 to 586.8°F.

Page 7 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING) 5.0 4.0 ACCEPTABLE OPERATING REGION

~

~

......... (2 001 .1 P>

~

REQUIRED SHUTDOWN MARGINj v v vv

~ (1 00 I ' .2 fJ) v~""

~ /

v

2. 0

~

I'll v v

. . .v !UNACCEPTABLE OPERATING REGIONj

( ~5( I . ~ 0) 1.0 0.0 0 500 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)

Page 8 of13

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE) v 5.0 (2 00, *9 eY

..,V v /

4.0 vv

!ACCEPTABLE OPERATING REGION I

/

v

/v

.!oe v

v

.!oe /

0 /

0 10 20 30 40 50 60 70 80 90 1 0 POWER (% of Rated Thermal Power)

  • Fully withdrawn shall be the condition where control rods are at a position within the interval ~ 225 and ::::; 231 steps withdrawn.

NOTE: The Rod Bank Insertion Limits are based on the control bank withdrawal sequence A, B, C, D and a control bank tip-to-tip distance of 115 steps.

Page 10 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE4 K(Z)- NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1.4 1.2 p;

0 E:-1 u

~ 1. 0

~

H -

~ FQ = 2.50 Po 0. 8

~ CORE t-::1 H HT. K(Z)

~ 0.6

~

0.00 1. 00 6.00 1. 00 12.0 .925

~

t-::1

~

0.4 0.2 0.0 0 2 4 6 8 10 12 CORE HEIGHT (feet)

Page 11 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURES AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF %RATED THERMAL POWER FORRAOC 120 110

(-15, 100) (+10, 100) 100

...... I ~

H Q) 90 u ~AC EP' ABlE I \ UN CCI PTP [BLE

~

Po II \

80 ~

a I \

I \

Q)

A ArcE PTAJ LE E-4 70 II

'd ~

\

I Q)

CIS 60

\

p:

16-1 I 0

dP so l 1\

p:

l ( -30, 50) I (+26, 50)

~

Po 40 30 20 10 0

-so -40 -30 -20 -10 0 10 20 30 40 so AXIAL FLUX DIFFERENCE (percent ~I)

Page 12 of13

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 19 DECEMBER 2015 FIGURE6 PREDICTED HFP 300 PPM MTC VS CYCLE BURNUP

-27 . 5

~

0 El

~

0 11.

.j.l

~

~

  • a - 28 . o

' i' '

OJ

  • ri OJ 0

u ~

OJ ......

1-l Bnl ~~

1-l

!t -28 . 5 ~

m ..... ~

E-t 1-l Bnl 1-l

~

~

-29 . 0 17000 1 8000 19000 20000 21000 Cycle Burnup (MWD/MTU)

Moderator Temperature Cycle Burnup Coefficient (MWD/MTU) (pcmjDF) 17000 -27.52 18000 -27.78 19000 -28.06 20000 -28.32 21000 -28.58 Page 13 of13

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