NL-20-0415, Vogle, Unit 1, Core Operating Limits Report Cycle 23 Version 3

Vogle, Unit 1, Core Operating Limits Report Cycle 23 Version 3

ML20104C142
Person / Time
Site:	Vogtle
Issue date:	04/13/2020
From:	Gayheart C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-20-0415
Download: ML20104C142 (16)

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Vogtle Electric Generating Plant - Unit 1 Core Operating Limits Report, Cycle 23, Version 3 ENCLOSURE to NL-20-0415 Vogtle Electric Generating Plant (VEGP) Unit 1 Cycle 23 Core Operating Limits Report Version 3

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 1 CYCLE 23 CORE OPERATING LIMITS REPORT Version 

0DUFK 2020

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 1 Cycle 23 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 - FQ(Z) 3.2.2 Nuclear Enthalpy Rise Hot Channnel Factor - FN¨+

3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 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 DV 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 'k/k.

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 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 2.3 Moderator Temperature Coefficient (Specification 3.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOL/ARO/HZP-MTC shall be less positive than +0.7 x 10-4 'k/k/qF for power levels up to 70% RTP with a linear ramp to 0 'k/k/qF at 100% RTP.

The EOL/ARO/RTP-MTC shall be less negative than -5.35 x 10-4 'k/k/qF. 1 2.3.2 The MTC Surveillance limits are:

The 300 ppm/ARO/RTP-MTC should be less negative than or equal to

-4.60 x 10-4 'k/k/qF. 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 burnup corresponding to the measurement of 300 ppm at RTP conditions,

• • AFD Correction is the more negative value of:

{0 pcm/°)RU ¨$)' $)' Sensitivity)}

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incore flux map taken at or near the burnup corresponding to 300 ppm, AFD Sensitivity = 0.08 pcm/°)¨$)'

• • • Predictive Correction is -3 pcm/°F.

The 60 ppm/ARO/RTP-MTC should be less negative than -5.20 x 10-4'k/k/qF. 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 580.0 to 587.0 °F.

Page 3 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 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)

FQRTP 2.6.1 FQ ( Z ) d K ( Z ) for P > 0.5 P

FQRTP FQ ( Z ) d K ( Z ) for P d 0.5 0.5 THERMAL POWER where: P RATED THERMAL POWER 2.6.2 FQRTP 2.50 2.6.3 K(Z) is provided in Figure 4.

FQRTP K ( Z )

2.6.4 FQ ( Z ) d for P > 0.5 P W (Z )

FQRTP K ( Z )

FQ ( Z ) d for P d 0.5 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 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 2.7 Nuclear Enthalpy Rise Hot Channel Factor - FN¨+ (Specification 3.2.2) 2.7.1 F'NH d F'RTP H 1  PF'H 1  P THERMAL POWER where: P RATED THERMAL POWER 2.7.2 F'RTP H 1.65 2.7.3 PF'H 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 2000 ppm. 2 2

This concentration bounds the condition of keff d 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 B10 depletion.

Page 5 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 Table 1 FQ(Z) PENALTY FACTOR Burnup Penalty (MWD/MTU) Factor 9941 1.0200 10158 1.0215 10376 1.0215 10593 1.0209 10811 1.0200 Notes:

 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 (QRPLQDOsurveillance interval of 31 EFPD plusthe 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.

 Linear interpolation is adequate for intermediate cycle burnups.

 For all cycle burnups outside the range of the table, a penalty factor of 1.0200 shall be used.

Page 6 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 Table 2 RAOC W(Z)

Axial Elevation 150 3000 8000 12000 16000 20000 Point (feet) MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU

• 1-5 12.072 - 11.267 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 6 11.066 1.2988 1.3597 1.3361 1.2485 1.1876 1.2011 7 10.865 1.2874 1.3574 1.3320 1.2433 1.1904 1.1965 8 10.664 1.2702 1.3457 1.3164 1.2324 1.1905 1.1939 9 10.462 1.2536 1.3264 1.2964 1.2191 1.1883 1.1949 10 10.261 1.2460 1.3067 1.2777 1.2051 1.1862 1.1907 11 10.060 1.2363 1.2917 1.2581 1.1916 1.1895 1.1916 12 9.859 1.2398 1.2676 1.2350 1.1808 1.1989 1.1912 13 9.658 1.2505 1.2622 1.2109 1.1774 1.1979 1.1900 14 9.456 1.2459 1.2594 1.2113 1.1783 1.2016 1.1945 15 9.255 1.2330 1.2578 1.2124 1.1770 1.1948 1.2068 16 9.054 1.2251 1.2506 1.2104 1.1825 1.1931 1.2161 17 8.853 1.2216 1.2370 1.2046 1.1858 1.1963 1.2251 18 8.652 1.2185 1.2239 1.2014 1.1891 1.1976 1.2314 19 8.450 1.2200 1.2152 1.2011 1.1969 1.2048 1.2345 20 8.249 1.2219 1.2102 1.2012 1.2038 1.2160 1.2426 21 8.048 1.2229 1.2027 1.2004 1.2081 1.2259 1.2517 22 7.847 1.2260 1.1967 1.1996 1.2106 1.2336 1.2603 23 7.646 1.2251 1.1951 1.2021 1.2109 1.2390 1.2730 24 7.444 1.2225 1.1907 1.2017 1.2100 1.2431 1.2826 25 7.243 1.2169 1.1835 1.1980 1.2056 1.2431 1.2871 26 7.042 1.2095 1.1744 1.1919 1.1990 1.2403 1.2876 27 6.841 1.2006 1.1642 1.1844 1.1914 1.2361 1.2861 28 6.640 1.1898 1.1556 1.1751 1.1832 1.2302 1.2820 29 6.438 1.1779 1.1473 1.1644 1.1759 1.2252 1.2751 30 6.237 1.1663 1.1395 1.1526 1.1684 1.2189 1.2655 31 6.036 1.1562 1.1327 1.1398 1.1603 1.2117 1.2540 32 5.835 1.1483 1.1283 1.1278 1.1512 1.2031 1.2429 33 5.634 1.1434 1.1235 1.1215 1.1481 1.1939 1.2354 34 5.432 1.1391 1.1204 1.1212 1.1556 1.1929 1.2269 35 5.231 1.1370 1.1215 1.1266 1.1627 1.1964 1.2275 36 5.030 1.1377 1.1301 1.1362 1.1689 1.1989 1.2284 37 4.829 1.1433 1.1375 1.1450 1.1741 1.2020 1.2295 38 4.628 1.1490 1.1446 1.1534 1.1783 1.2039 1.2297 39 4.426 1.1540 1.1512 1.1612 1.1814 1.2043 1.2278 40 4.225 1.1580 1.1570 1.1678 1.1834 1.2033 1.2243 41 4.024 1.1611 1.1619 1.1755 1.1840 1.2012 1.2193 42 3.823 1.1635 1.1673 1.1850 1.1863 1.1968 1.2115 43 3.622 1.1650 1.1738 1.1935 1.1911 1.1907 1.2012 44 3.420 1.1670 1.1800 1.2010 1.1949 1.1838 1.1902 45 3.219 1.1711 1.1840 1.2074 1.1977 1.1803 1.1796 46 3.018 1.1743 1.1947 1.2131 1.2008 1.1860 1.1755 47 2.817 1.1871 1.2104 1.2179 1.2079 1.1982 1.1828 48 2.616 1.2041 1.2288 1.2355 1.2214 1.2098 1.1960 49 2.414 1.2202 1.2481 1.2571 1.2361 1.2215 1.2086 50 2.213 1.2365 1.2676 1.2782 1.2505 1.2331 1.2214 51 2.012 1.2529 1.2882 1.2988 1.2639 1.2434 1.2324 52 1.811 1.2691 1.3109 1.3190 1.2768 1.2531 1.2427 53 1.610 1.2845 1.3326 1.3382 1.2893 1.2631 1.2536 54 1.408 1.2993 1.3532 1.3564 1.3014 1.2733 1.2649 55 1.207 1.3134 1.3724 1.3733 1.3129 1.2833 1.2762 56 1.006 1.3267 1.3898 1.3888 1.3238 1.2932 1.2877

• 57-61 0.805 - 0.000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000

• Top and Bottom 5 Points Excluded per Technical Specification B3.2.1.

These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 580.0 to 587.0°F.

Page 7 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 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

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( ~5 ( 1 . 0) 1.0 0.0 0 500 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)

Page 8 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE) v

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Page 9 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 FIGURE 3 ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn*)

Fully withdrawn shall be the condition where control rods are at a position within the interval t 225 and d 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 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 FIGURE 4 K(Z) - NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1o4 102

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~~ 0 6 OoOO 1 000 6000 1 000 12 . 0 0 925 0

t-:1

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0 04 0 02 OoO 0 2 4 6 8 10 12 CORE HEIGHT ( feet)

Page 11 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % RATED THERMAL POWER FOR RAOC 1 20 110

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Page 12 of 13

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 23 MARCH 2020 FIGURE 6 PREDICTED HFP 300 PPM MTC VS CYCLE BURNUP

-28.0 Moderator Temperature Coefficient (pcm/°F)

-28.5

-29.0

-29.5 18000 19000 20000 21000 22000 Cycle Burnup (MWD/MTU)

Cycle Burnup Moderator Temperature Coefficient (MWD/MTU) (pcm/°F) 18000 -28.35 19000 -28.62 20000 -28.89 21000 -29.16 22000 -29.42 Page 13 of 13