WBL-20-058, Plants, Units 1 and 2 - Revision 1 of the Unit 1 Cycle 17 Core Operating Limits Report (COLR) and Revision 0 of the Unit 2 Cycle 4 Core Operating Limits Report (COLR)

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Plants, Units 1 and 2 - Revision 1 of the Unit 1 Cycle 17 Core Operating Limits Report (COLR) and Revision 0 of the Unit 2 Cycle 4 Core Operating Limits Report (COLR)
ML20310A172
Person / Time
Site: Watts Bar  Tennessee Valley Authority icon.png
Issue date: 11/05/2020
From: Anthony Williams
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
WBL-20-058
Download: ML20310A172 (25)
v • d • e


Text

[iID Tennessee Valley Authority , Post Office Box 2000, Spring City, Tennessee 3738 1-2000 WBL-20-058 November 5, 2020 10 CFR 50.4 ATTN : Document Control Desk U. S. Nuclear Regulatory Commission Washington , D.C. 20555-0001 Watts Bar Nuclear Plants, Units 1 and 2 Facility Operating License Nos. NPF-90 and NPF-96 NRC Docket Nos. 50-390 and 50-391

Subject:

REVISION 1 OF THE UNIT 1 CYCLE 17 CORE OPERATING LIMITS REPORT (COLR) AND REVISION O OF THE UNIT 2 CYCLE 4 CORE OPERATING LIMITS REPORT (COLR)

Pursuant to Watts Bar Nuclear Plant Technical Specifications Section 5.9.5.d, Tennessee Valley Authority (TVA) has enclosed Revision 1 of the Unit 1 Cycle 17 COLR and Revision O of the Unit 2 Cycle 4 COLR. The analytical methods used to determine the core operating limits were previously reviewed and approved by the NRC.

There are no new regulatory commitments contained in this letter or the enclosure . Should you have questions regarding this submittal, please contact Tony Brown, Site Licensing Manager at (423) 365-7720.

nt Watts Bar Nuclear Plant

U.S. Nuclear Regulatory Commission WBL-20-058 Page2 November 5, 2020

Enclosures:

1. Watts Bar Nuclear Plant, Unit 1, Cycle 17 Core Operating Limits Report, Revision 1, October 2020
2. Watts Bar Nuclear Plant, Unit 2, Cycle 4 Core Operating Limits Report, Revision 0, October 2020 cc (Enclosures):

NRC Regional Administrator - Region II NRC Project Manager- Watt Bar Nuclear Plant NRC Senior Resident Inspector - Watts Bar Nuclear Plant

ENCLOSURE 1 Watts Bar Nuclear Plant, Unit 1, Cycle 17 Core Operating Limits Report Revision 1 October 2020

QA Record L36 200916 800 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 17 CORE OPERATING LIMITS REPORT Revision 1 October 2020 Prepared by:

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B.A. Jenkins, P l ~ ' Date' Dateof PORC Affected Revision ADDmVRI Paaes Reason for Revision 0 04/23/2020 All Initial Issue Updated Refueling Boron Concentration 1 See Above 4 to .2300 DDffl Unit I Cycle 17 WATISBAR Page I of IO Revision I

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 1 Cycle 17 has been prepared in accordance with the requirements of the Technical Specifications 5.9.5.

The Technical Specifications affected by this report are listed below:

3.1.4 Moderator Temperature Coefficient (MTC) 3.1.5 Rod Group Alignment Limits 3.1.6 Shutdown Bank Insertion Limits 3.1. 7 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor (FQ(Z))

3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (FMIN) 3.2.3 Axial Flux Difference (AFD) 3.9.1 Boron Concentration 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 the NRC approved methodologies specified in the Technical Specifications Section 5.9.5.

The following abbreviations are used in this section:

BOL Beginning of Cycle Life ARO All Rods Out HZP Hot Zero Thermal Power EOL End of Cycle Life RTP Rated Thermal Power 2.1 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.4) 2.1.1 The MTC limits are:

The ARO/HZP - MTC shall be less positive than or equal to O Ak/k/°F (upper limit).

With the measured BOLiARO/HZP - MTC more positive than -3.553 x 10-5 Ak/k/°F (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to OAk/k/°F (upper limit) for all times in core life.

The EOL/ARO/RTP - MTC shall be less negative than or equal to

-4.5 x 10-4 Ak/k/°F (lower limit).

2.1.2 The 300 ppm surveillance limit is:

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

-3.75 X 10-4 Ak/k/°F.

2.1.3 The 60 ppm surveillance limit is:

The measured 60 ppm/ARO/RTP-MTC should be less negative than or equal to

-4.28 X 10-4 Ak/k/°F.

Unit 1 Cycle 17 WATTS BAR Page 2 of 10 Revision 1

2.2 SHUTDOWN MARGIN - SOM (LCO 3.1.5, 3.1.6, 3.1.7) 2.2.1 For TS 3.1.5, SDM shall be~ 1.6% L\k/k in MODE l and MODE 2.

2.2.2 For TS 3.1.6, SDM shall be~ 1.6% L\k/k in MODE 1 and MODE 2.

2.2.3 For TS 3.1.7, SDM shall be~ 1.6% L\k/k in MODE 1 and MODE 2 with keff~ 1.0.

2.3 SHUTDOWN BANK INSERTION LIMITS (LCO 3.1.6) 2.3.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps withdrawn.

2.4 CONTROL BANK INSERTION LIMITS (LCO 3.1.7) 2.4.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure 1.

2.4.2 Each control bank shall be considered fully withdrawn from the core at greater than or equal to 225 steps.

2.4.3 The control banks shall be operated in sequence by withdrawal of Bank A, Bank B, Bank C, and Bank D. The control banks shall be sequenced in reverse order upon insertion.

2.4.4 Each control bank not fully withdrawn from the core shall be operated with the following overlap as a function of park position.

Park Position (steps) Bank Overlap (steps) Bank Difference (steps) 225 109 116 226 110 116 227 111 116 228 112 116 229 113 116 230 114 116 231 115 116 2.5 HEAT FLUX HOT CHANNEL FACTOR- FQ(Z) (LCO 3.2.1)

FQ(Z) ~ [CFQ IP]

  • K(Z) for P > 0.5 FQ(Z) ~ [CFQ / 0.5]
  • K(Z) for P ~ 0.5 Where P = Thermal Power/ Rated Thermal Power 2.5.1 CFQ = 2.50 Unit 1 Cycle 17 WATTS BAR Page 3 of 10 Revision 1

2.5.2 K(Z) is provided in Figure 2.

2.5.3 Fow(z) = Foc(z)

  • W(Z)/P for P > 0.5 Fow(z) = Foc(z)
  • W(Z)/0.5 for P ~ 0.5 where: W(Z) values are provided in Tables A.1 and A.3. Table A.1 contains normal W(Z) factors based on the non-perturbed model. Table A.3 contains W(Z) factors based on the perturbed model.

The data in Tables A. I and A.3 should be used independently; cross interpolation or extrapolation between W(Z) sets is prohibited.

Table A.1 values should be used when D-AO is in the range of 2:-3% and~ +3%.

Table A.3 values should be used when D-AO is in the range of 2: 0% and~ +6%.

These tables provide sufficient information to determine W(Z) versus core height for all cycle bumups.

2.5.4 Part power W(Z) values are only required to be used when the part power surveillance is performed using the moveable incore detector system.

2.5.5 Fow(z) Penalty Factor The Fow(Z) penalty factor is provided in Table A.2.

2.6 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR- F.ul (LCO 3.2.2) where P = Thermal Power / Rated Thermal Power F~ttRTP = 1.65 for RFA-2 fuel, and PF =0.3 2.7 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.7.1 The AFD limits for Cycle 17 are provided in Figure 3.

2.8 REFUELING BORON CONCENTRATION (LCO 3.9.1) 2.8.1 The refueling boron concentration shall be~ 2300 ppm.

3.0 NUMBER OF TPBARS IN REACTOR CORE (TS 4.2.1) 3.0.1 There are 1792 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle I 7.

Unit 1 Cycle 17 WATTS BAR Page 4 of 10 Revision 1

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0.8 1.0 FRACTION OF RATED THERMAL POWER Figure 1 Control Bank Insertion Limits Versus Thermal Power Four Loop Operation Note: Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of~ 225 and ~ 231 steps withdrawn.

Unit 1 Cycle17 WATTS BAR Page 5 of 10 Revision 1

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0 2 4 6 8 10 12 Core Height (feet)

Figure 2 K(Z) - Normalized FQ(Z) as a Function of Core Height Unit 1 Cycle17 WATTS BAR Page 6 of 10 Revision 1

120 110 I (-12, 100) I i (7, 100) I 100 I \

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Figure3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)

Unit 1 Cycle 17 WATTS BAR Page 7 of 10 Revision 1

TableA.l RAOC W(Z) Surveillance Factors (Normal Model) for D-AO of ~-3% and S +3%

MaxW(z) MaxW(z) MaxW(z) MaxW(z) MaxW(z) MaxW(z) MaxW(z) MaxW(z) MaxW(z) at150 at150 at 150 at4000 at&O00 atB000 at 12000 at 18000 at 18000 Height MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU (ft)

(30% (75% (100% (100% (100% (100% (100% (100% (100%

Powerl Powerl Powerl Powerl Powerl Powerl Po-r1 Powerl Powerl 12.0740 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.8728 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.6715 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.4703 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.2691 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.0678 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10.8666 1.4763 1.4704 1.2823 1.3044 1.2570 1.1906 1.1504 1.1418 1.1568 10.6654 1.4314 1.4256 1.2785 1.2982 1.2522 1.1864 1.1464 1.1400 1.1573 10.4641 1.3870 1.3792 1.2719 1.2891 1.2447 1.1859 1.1440 1.1356 1.1532 10.2629 1.3406 1.3293 1.2631 1.2781 1.2386 1.1825 1.1360 1.1300 1.1474 10.0617 1.3038 1.2890 1.2531 1.2657 1.2315 1.1780 1.1308 1.1217 1.1407 9.6604 1.2698 1.2510 1.2418 1.2615 1.2220 1.1748 1.1235 1.1183 1.1330 9.6592 1.2363 1.2165 1.2307 1.2630 1.2115 1.1740 1.1201 1.1222 1.1274 9.4580 1.2079 1.1898 1.2245 1.2598 1.2064 1.1743 1.1225 1.1243 1.1273 9.2567 1.1925 1.1782 1.2307 1.2557 1.2043 1.1702 1.1238 1.1294 1.1335 9.0555 1.1804 1.1739 1.2384 1.2499 1.2020 1.1662 1.1243 1.1336 1.1421 8.8543 1.1650 1.1692 1.2415 1.2409 1.1973 1.1637 1.1277 1.1357 1.1492 8.6530 1.1491 1.1639 1.2427 1.2314 1.1938 1.1637 1.1370 1.1400 1.1555 8.4518 1.1313 1.1572 1.2415 1.2253 1.1955 1.1689 1.1514 1.1499 1.1659 8.2506 1.1121 1.1502 1.2385 1.2182 1.1954 1.1723 1.1637 1.1605 1.1771 8.0493 1.0932 1.1427 1.2336 1.2107 1.1931 1.1734 1.1737 1.1721 1.1893 7.6481 1.0743 1.1351 1.2274 1.2040 1.1894 1.1734 1.1820 1.1834 1.2009 7.6469 1.0572 1.1281 1.2206 1.1973 1.1642 1.1715 1.1681 1.1922 1.2099 7.4456 1.0422 1.1218 1.2137 1.1893 1.1775 1.1680 1.1923 1.1990 1.2166 7.2444 1.0277 1.1148 1.2052 1.1601 1.1694 1.1664 1.1945 1.2037 1.2212 7.0432 1.0160 1.1086 1.1970 1.1719 1.1604 1.1689 1.1948 1.2064 1.2236 6.6419 1.0074 1.1043 1.1902 1.1666 1.1551 1.1673 1.1933 1.2070 1.2237 6.6407 1.0034 1.1024 1.1855 1.1631 1.1543 1.1647 1.1903 1.2058 1.2219 6.4395 1.0023 1.1022 1.1821 1.1581 1.1516 1.1609 1.1859 1.2033 1.2186 6.2382 1.0013 1.1007 1.1769 1.1531 1.1477 1.1552 1.1797 1.1990 1.2134 6.0370 1.0031 1.1011 1.1734 1.1490 1.1453 1.1502 1.1718 1.1928 1.2062 5.8358 1.0073 1.1026 1.1708 1.1445 1.1433 1.1491 1.1629 1.1649 1.1972 5.6345 1.0105 1.1027 1.1662 1.1390 1.1397 1.1514 1.1564 1.1754 1.1865 5.4333 1.0136 1.1020 1.1605 1.1341 1.1363 1.1518 1.1551 1.1665 1.1756 5.2321 1.0190 1.1031 1.1565 1.1304 1.1366 1.1511 1.1558 1.1652 1.1701 5.0308 1.0255 1.1045 1.1528 1.1264 1.1370 1.1497 1.1583 1.1648 1.1704 4.8296 1.0322 1.1060 1.1483 1.1215 1.1362 1.1470 1.1610 1.1648 1.1721 4.6264 1.0389 1.1066 1.1431 1.1162 1.1349 1.1449 1.1628 1.1658 1.1723 4.4271 1.0455 1.1063 1.1372 1.1104 1.1331 1.1459 1.1650 1.1669 1.1718 4.2259 1.0524 1.1055 1.1308 1.1043 1.1308 1.1467 1.1680 1.1674 1.1705 4.0247 1.0593 1.1041 1.1238 1.0977 1.1281 1.1470 1.1710 1.1675 1.1689 3.8234 1.0667 1.1026 1.1166 1.0922 1.1251 1.1470 1.1735 1.1679 1.1662 3.6222 1.0734 1.1007 1.1090 1.0885 1.1222 1.1468 1.1760 1.1699 1.1653 3.4210 1.0814 1.1004 1.1029 1.0852 1.1209 1.1467 1.1798 1.1780 1.1713 3.2197 1.0978 1.1085 1.1050 1.0854 1.1226 1.1467 1.1874 1.1854 1.1774 3.0185 1.1157 1.1173 1.1074 1.0903 1.1331 1.1528 1.1979 1.1938 1.1839 2.8173 1.1382 1.1298 1.1132 1.1032 1.1508 1.1694 1.2144 1.2085 1.1947 2.6160 1.1685 1.1494 1.1264 1.1198 1.1699 1.1892 1.2369 1.2293 1.2090 2.4148 1.1996 1.1688 1.1397 1.1364 1.1890 1.2088 1.2582 1.2488 1.2223 2.2136 1.2314 1.1878 1.1528 1.1531 1.2077 1.2282 1.2789 1.2676 1.2387 2.0123 1.2634 1.2070 1.1653 1.1694 1.2257 1.2470 1.2988 1.2856 1.2556 1.8111 1.2958 1.2261 1.1771 1.1851 1.2427 1.2647 1.3173 1.3023 1.2713 1.6099 1.3278 1.2440 1.1879 1.1997 1.2583 1.2811 1.3342 1.3176 1.2858 1.4086 1.3592 1.2597 1.1965 1.2122 1.2714 1.2949 1.3483 1.3302 1.2978 1.2074 1.3891 1.2718 1.2013 1.2210 1.2806 1.3048 1.3580 1.3364 1.3057 1.0062 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.8049 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.6037 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.4025 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.2012 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Unit 1 Cycle 17 WATTS BAR Page 8 of 10 Revision 1

Table A.2 FQw(Z) Penalty Factor Cycle Burnup (MWD/MTU)

Ff (Z) Penalty Factor 909 1.0200 1099 1.0204 1289 1.0200 1479 1.0200 1668 1.0212 1858 1.0223 2048 1.0230 2238 1.0232 2428 1.0228 2618 1.0218 2807 1.0203 2997 1.0200 8502 1.0200 8691 1.0202 8881 1.0210 9071 1.0216 9261 1.0222 9451 1.0227 9641 1.0231 9830 1.0233 10020 1.0200 Note:

1. The Penalty Factor, which is applied to FQw(z) for compliance with Surveillance Requirement 3.2.1.2, is the maximum factor by which FQw(z) is expected to increase per 31 Effective Full Power Days (EFPD) starting from the burnup at which the FQw(Z) was determined. This Penalty Factor is applicable for both sets ofW(Z) Surveillance Factors provided in Tables A.1 and A.3.

Unit 1 Cycle 17 WATTS BAR Page 9 of 10 Revision 1

TableA.3 RAOC W(Z) Surveillance Factors (Perturbed Model) for D-AO of ~ 0%, and :5 +6%

MaxW(z)at MaxW(z)at MaxW(z)at MaxW(z)at MaxW(z)at MaxW(z)at MaxW(z)at 150 4000 6000 8000 12000 16000 18000 MWO/MTU MWO/MTU MWO/MTU MWD/MTU MWD/MTU MWO/MTU MWD/MTU Heiahtlftl 1100% Power\ 1100% Power\ 1100% Power\ 1100% Power\ 1100% Power\ 1100% Power\ 1100% Power\

12.0740 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.8728 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.6715 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.4703 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.2691 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.0678 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10.8666 1.1965 1.2605 1.2049 1.1293 1.0978 1.1049 1.1425 10.6654 1.2017 1.2558 1.2019 1.1274 1.0973 1.1032 1.1337 10.4641 1.2032 1.2484 1.1963 1.1231 1.0946 1.0990 1.1248 10.2629 1.2025 1.2393 1.1889 1.1201 1.0905 1.0928 1.1088 10.0617 1.1990 1.2311 1.1807 1.1185 1.0854 1.0890 1.0929 9.8604 1.1956 1.2230 1.1707 1.1181 1.0810 1.0885 1.0845 9.6592 1.1937 1.2123 1.1622 1.1217 1.0793 1.0881 1.0849 9.4580 1.1905 1.2007 1.1600 1.1293 1.0796 1.0860 1.0912 9.2567 1.1869 1.2002 1.1607 1.1295 1.0828 1.0881 1.0989 9.0555 1.1880 1.2017 1.1606 1.1291 1.0887 1.0939 1.1074 8.8543 1.1939 1.1981 1.1573 1.1300 1.0963 1.0999 1.1146 8.6530 1.2009 1.1945 1.1545 1.1312 1.1070 1.1060 1.1240 8.4518 1.2067 1.1963 1.1588 1.1385 1.1223 1.1163 1.1423 8.2506 1.2100 1.1963 1.1627 1.1440 1.1358 1.1287 1.1587 8.0493 1.2108 1.1938 1.1649 1.1473 1.1471 1.1421 1.1725 7.8481 1.2096 1.1899 1.1661 1.1495 1.1569 1.1549 1.1848 7.6469 1.2064 1.1844 1.1659 1.1513 1.1649 1.1656 1.1949 7.4456 1.2013 1.1773 1.1644 1.1545 1.1710 1.1745 1.2029 7.2444 1.1941 1.1682 1.1617 1.1580 1.1754 1.1814 1.2088 7.0432 1.1879 1.1613 1.1577 1.1601 1.1779 1.1866 1.2126 6.8419 1.1841 1.1584 1.1552 1.1607 1.1788 1.1898 1.2142 6.6407 1.1820 1.1570 1.1546 1.1603 1.1784 1.1914 1.2140 6.4395 1.1808 1.1540 1.1522 1.1585 1.1766 1.1918 1.2125 6.2382 1.1783 1.1499 1.1493 1.1549 1.1732 1.1905 1.2090 6.0370 1.1736 1.1473 1.1477 1.1519 1.1678 1.1874 1.2036 5.8358 1.1697 1.1447 1.1455 1.1518 1.1624 1.1828 1.1963 5.6345 1.1674 1.1410 1.1432 1.1538 1.1597 1.1762 1.1874 5.4333 1.1641 1.1390 1.1440 1.1553 1.1594 1.1691 1.1788 5.2321 1.1634 1.1391 1.1448 1.1566 1.1586 1.1697 1.1748 5.0308 1.1627 1.1389 1.1464 1.1574 1.1619 1.1708 1.1746 4.8296 1.1607 1.1377 1.1482 1.1565 1.1705 1.1712 1.1768 4.6284 1.1581 1.1360 1.1491 1.1560 1.1786 1.1742 1.1806 4.4271 1.1548 1.1338 1.1494 1.1598 1.1864 1.1795 1.1849 4.2259 1.1508 1.1311 1.1492 1.1637 1.1937 1.1846 1.1887 4.0247 1.1464 1.1284 1.1486 1.1679 1.2007 1.1883 1.1915 3.8234 1.1412 1.1247 1.1480 1.1730 1.2075 1.1956 1.1953 3.6222 1.1363 1.1224 1.1483 1.1793 1.2141 1.2086 1.2016 3.4210 1.1336 1.1257 1.1534 1.1867 1.2206 1.2213 1.2096 3.2197 1.1347 1.1292 1.1589 1.1933 1.2262 1.2336 1.2172 3.0185 1.1438 1.1341 1.1695 1.2036 1.2367 1.2448 1.2243 2.8173 1.1606 1.1458 1.1865 1.2190 1.2560 1.2625 1.2313 2.6160 1.1764 1.1645 1.2065 1.2383 1.2810 1.2885 1.2432 2.4148 1.1953 1.1836 1.2261 1.2607 1.3047 1.3126 1.2651 2.2136 1.2138 1.2023 1.2455 1.2824 1.3277 1.3358 1.2863 2.0123 1.2313 1.2204 1.2641 1.3030 1.3495 1.3577 1.3058 1.8111 1.2480 1.2375 1.2818 1.3225 1.3699 1.3781 1.3243 1.6099 1.2632 1.2531 1.2979 1.3401 1.3884 1.3966 1.3412 1.4086 1.2760 1.2663 1.3115 1.3550 1.4040 1.4121 1.3552 1.2074 1.2846 1.2757 1.3212 1.3657 1.4149 1.4228 1.3648 1.0062 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.8049 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.6037 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.4025 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.2012 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Unit 1 Cycle 17 WATTS BAR Page 10 of 10 Revision 1

ENCLOSURE2 Watts Bar Nuclear Plant, Unit 2, Cycle 4 Core Operating Limits Report Revision 0 October 2020

QA Record L36 200928 801 WATTS BAR NUCLEAR PLANT, UNIT 2, CYCLE 4 CORE OPERATING LIMITS REPORT Revision O October 2020 Prepared by:

Yetzer,____________

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Korrie L. Yetzer, PWR Fuel Engineering Verified by: .,....._ ____

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(Yo..e,J;.:_X -

Jamel C. Bell, PWR Fuel Engineering

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Date Reviewed by:

I John A. Ritchie, Manager, PWR Fuel Engineering Date Mack, Bryan Thomas Date: DigitallysignedbyMack,BryanThomas 2020.10.05 10:44:J 6 -04'00' Bryan T. Mack, Manager, Reactor Engineering Date Approved by:

~----'# 6_

PORC Chairman

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_____________,I /o -11*3-0iJ'O Date Plant Manager L;V~Ct 1i M ~ I t DateofPORC Affected Revision ADDroval Paaes Reason for Revision 0 SeeAbove All lnltlal Issue Unit2 Cycle4 WATI'SBAR Page I ofll RevisionO

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 2 Cycle 4 has been prepared in accordance with the requirements of the Technical Specifications (TS) 5.9.5.

The Technical Specifications affected by this report are listed below:

3.1.4 Moderator Temperature Coefficient (MTC) 3.1.5 Rod Group Alignment Limits 3.1.6 Shutdown Bank Insertion Limits 3.1.7 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor (Fo(Z))

3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F,rnN) 3.2.3 Axial Flux Difference (AFD) 3.9.1 Boron Concentration 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 the NRC approved methodologies specified in the Technical Specifications Section 5.9.5.

The following abbreviations are used in this section:

BOL Beginning of Cycle Life ARO All Rods Out HZP Hot Zero Thermal Power EOL End of Cycle Life RTP Rated Thermal Power Unit2 Cycle 4 WATTS BAR Page 2 of 11 Revision 0

2.1 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.4) 2.1.1 The MTC limits are:

The ARO/HZP - MTC shall be less positive than or equal to OAk/k/°F (upper limit).

With the measured BOL/ARO/HZP - MTC more positive than -2.12 x 10-5 Ak/k/°F (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to OAk/k/°F (upper limit) for all times in core life.

The EOL/ARO/RTP - MTC shall be less negative than or equal to

-4.50 x 104 Ak/k/°F (lower limit).

2.1.2 The 300 ppm surveillance limit is:

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

-3.75 X 10-4 Ak/k/°F.

2.1.3 The 60 ppm surveillance limit is:

The measured 60 ppm /ARO/RTP-MTC should be less negative than or equal to

-4.28 X 10*4 Ak/k/°F.

2.2 SHUTDOWN MARGIN - SDM (LCO 3.1.5, 3.1.6, 3.1.7) 2.2.1 For TS 3.1.5, SOM shall be~ 1.6% ~k/k in MODE 1 and MODE 2.

2.2.2 For TS 3.1.6, SOM shall be~ 1.6% ~

in MODE 1 and MODE 2.

2.2.3 For TS 3.1.7, SOM shall be~ 1.6% ~

in MODE 1 and MODE 2 with ketr~ 1.0.

2.3 SHUTDOWN BANK INSERTION LIMITS (LCO 3.1.6) 2.3.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps withdrawn.

2.4 CONTROL BANK INSERTION LIMITS (LCO 3.1.7) 2.4.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure 1.

2.4.2 Each control bank shall be considered fully withdrawn from the core at greater than or equal to 225 steps.

2.4.3 The control banks shall be operated in sequence by withdrawal of Bank A, Bank B, Bank C, and Bank D. The control banks shall be sequenced in reverse order upon insertion.

Unit2 Cycle 4 WATTS BAR Page 3 of 11 Revision 0

2.4.4 Each control bank not fully withdrawn from the core shall be operated with the following overlap as a function of park position.

Park Position (steps) Bank Overlap (steps) Bank Difference (steps) 225 109 116 226 110 116 227 111 116 228 112 116 229 113 116 230 114 116 231 115 116 2.5 HEAT FLUX HOT CHANNEL FACTOR- FQ(Z) (LCO 3.2.1)

FQ(Z) ~ [CFQ IP]

  • K(Z) for P > 0.5 FQ(Z) ~ [CFQ/ 0.5]
  • K(Z) for P ~ 0.5 Where P = Thermal Power/ Rated Thermal Power 2.5.1 CFQ = 2.50 2.5.2 K(Z) is provided in Figure 2.

2.5.3 FQw(z) = FQc(z)

  • W(Z)/P for P > 0.5 FQw(Z) = FQc(z)
  • W(Z)/0.5 for P :5 0.5 where: W(Z) values are provided in Tables A.I and A.3. Table A.1 contains normal W(Z) factors based on the non-perturbed model. Table A.3 contains W(Z) factors based on the perturbed model.

The data in Tables A.1 and A.3 should be used independently; cross interpolation or extrapolation between W(Z) sets is prohibited.

Table A.1 values should be used when D-AO is in the range of2:-3% and :5 +3%.

Table A.3 values should be used when D-AO is in the range of 2: -6% and :5 0%.

These tables provide sufficient information to determine W (Z) versus core height for all cycle burnups.

2.5.4 Part power W(Z) values are only required to be used when the part power surveillance is performed using the fixed incore detector system.

2.5.5 FQw(Z) Penalty Factor The FQw(z) penalty factor is provided in Table A.2.

Unit2 Cycle 4 WATTS BAR Page4 of 11 Revision 0

2.6 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR- FAif (LCO 3.2.2) where P = Thermal Power / Rated Thermal Power FMIRTP = 1.65 forRFA-2 fuel, and PF =0.3 2.7 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.7.1 The AFD limits for Cycle 4 are provided in Figure 3.

2.8 REFUELING BORON CONCENTRATION (LCO 3.9.1) 2.8.1 The refueling boron concentration shall be~ 2300 ppm.

3.0 NUMBER OF TPBARS IN REACTOR CORE (TS 4.2.1) 3 .0.1 There are 544 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 4.

Unit2 Cycle 4 WATTS BAR Page 5 of 11 Revision 0

200

...* '\ *- ,I****-**-*

.. 1

. - !----t--l--

(1.0, 177) z 175 I

Q

c 3: 150 II) '
  • ~ .-~ --f '

0.

w '

I

~ I

.--f z

0 125 E

II) 0 0.

0.

w t; 100 z

ct m

Q 0 75 a::

50 25 0.0 0.2 0.4 0.6 0.8 1.0 FRACTION OF RATED THERMAL POWER Figure 1 Control Bank Insertion Limits Versus Thermal Power Four Loop Operation

  • Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of~ 225 and :S: 231 steps withdrawn.

Unit2 Cycle 4 WATTS BAR Page 6 of 11 Revision 0

1.2 1.1 1

0.9 0.8 cu

~ 0.7 A.

~c:J "Cl 0.6 Core Height K(Z)

-~

ii 0.000 6.000 1.000 1.000 E 0.5 0 12.000 1.000 z

0.4 0.3 0.2 0.1 0

0 1 2 3 4 5 6 7 8 9 10 11 12 Core Height (feet)

Figure 2 K(Z) - Normalized FQ(Z) as a Function of Core Height Unit2 Cycle 4 WATTS BAR Page 7 of 11 Revision 0

120 110 I (-12, 100) I 1 (7, 100) I 100 I \

90 I. i' \

/ I Acceptable Operation 80 tJ Unacceptable Operation I II \

\ I Unacceptable Operation t

~ \

CL 1ii e

G)

.s::.

70 I'I \

\

I- 60 I

aJ

~

0

~

0 50 I

I

(-28, 50) I I ' l (21, 50> I 40 30 20 10 0

-50 -40 -30 -20 -10 0 10 20 30 40 50 Flux Difference (Al}%

Figure3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)

Unit2 Cycle 4 WATTS BAR Page 8 of 11 Revision 0

Table A.1 RAOC W(Z) Surveillance Factors (Normal Model) for D-AO of~-3% and~ +3%

MaxW(z) at MaxW(z) at MaxW(z)at MaxW(z) at MaxW(z) at MaxW(z) at MaxW(z) at MaxW(z) at 150 2000 8000 12000 14000 16000 150 150 MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU (100% (100% (100% (100% (100% (100%

Heiaht (ftl 130% Power) 175% Power) Power) Powerl Power) Power) Power) Powerl 12.0720 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.8708 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.6696 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.4884 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.2672 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.0660 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10.8848 1.3227 1.2979 1.1856 1.1936 1.1905 1.2038 1.1931 1.2157 10.6636 1.3121 1.2759 1.1861 1.1902 1.1857 1.1910 1.1888 1.2160 10.4624 1.2985 1.2585 1.1873 1.1860 1.1849 1.1852 1.1833 12181 10.2612 1.2843 1.2365 1.1854 1.1799 1.1814 1.1766 1.1796 1.2056 10.0600 1.2634 1.2115 1.1808 1.1726 1.1758 1.1633 1.1754 1.1890 9.8588 1.2445 1.1882 1.1751 1.1716 1.1694 1.1559 1.1700 1.1697 9.6576 1.2271 1.1761 1.1795 1.1721 1.1624 1.1618 1.1639 1.1646 9.4564 1.2043 1.1626 1.1791 1.1695 1.1544 1.1748 1.1582 1.1602 9.2552 1.1768 1.1497 1.1784 1.1667 1.1459 1.1741 1.1600 1.1553 9.0540 1.1417 1.1361 1.1761 1.1623 1.1467 1.1757 1.1608 1.1610 8.8528 1.1260 1.1238 1.1705 1.1569 1.1508 1.1796 1.1596 1.1647 8.6516 1.1010 1.1159 1.1692 1.1570 1.1536 1.1918 1.1581 1.1666 8.4504 1.0941 1.1206 1.1791 1.1633 1.1595 1.2073 1.1630 1.1746 8.2492 1.0864 1.1295 1.1915 1.1736 1.1704 1.2201 1.1792 1.1918 8.0480 1.0822 1.1350 1.2011 1.1820 1.1797 1.2303 1.1930 1.2068 7.8468 1.0753 1.1391 1.2085 1.1885 1.1871 1.2381 1.2048 1.2195 7.6456 1.0694 1.1412 1.2121 1.1915 1.1914 1.2427 12134 1.2290 7.4444 1.0556 1.1425 1.2137 1.1928 1.1941 1.2453 1.2204 1.2368 7.2432 1.0527 1.1430 1.2131 1.1919 1.1944 1.2447 1.2244 1.2414 7.0420 1.0490 1.1413 1.2111 1.1895 1.1930 1.2419 1.2262 1.2435 6.8408 1.0422 1.1372 1.2072 1.1857 1.1899 1.2369 1.2259 1.2434 6.6396 1.0338 1.1297 1.2010 1.1797 1.1852 1.2302 1.2234 1.2409 6.4384 1.0300 1.1247 1.1938 1.1727 1.1793 1.2219 1.2197 1.2372 6.2372 1.0260 1.1192 1.1859 1.1687 1.1722 1.2118 1.2142 1.2313 6.0360 1.0231 1.1134 1.1758 1.1643 1.1638 1.2000 1.2070 1.2236 5.8348 1.0218 1.1102 1.1700 1.1578 1.1544 1.1867 1.1979 1.2140 5.6336 1.0322 1.1175 1.1668 1.1515 1.1508 1.1721 1.1875 1.2028 5.4324 1.0325 1.1127 1.1642 1.1482 1.1478 1.1613 1.1744 1.1876 5.2312 1.0415 1.1171 1.1627 1.1475 1.1478 1.1583 1.1682 1.1779 5.0300 1.0509 1.1202 1.1631 1.1495 1.1496 1.1572 1.1688 1.1778 4.8288 1.0612 1.1257 1.1631 1.1503 1.1502 1.1548 1.1679 1.1759 4.6276 1.0703 1.1284 1.1624 1.1506 1.1503 1.1528 1.1664 1.1733 4.4264 1.0800 1.1324 1.1610 1.1503 1.1497 1.1521 1.1639 1.1697 4.2252 1.0876 1.1335 1.1587 1.1493 1.1485 1.1505 1.1608 1.1654 4.0240 1.0942 1.1341 1.1555 1.1476 1.1467 1.1485 1.1571 1.1603 3.8228 1.1047 1.1358 1.1517 1.1457 1.1445 1.1454 1.1524 1.1541 3.6216 1.1156 1.1391 1.1503 1.1428 1.1409 1.1452 1.1468 1.1468 3.4204 1.1302 1.1470 1.1534 1.1453 1.1433 1.1486 1.1420 1.1408 3.2192 1.1517 1.1582 1.1589 1.1491 1.1488 1.1522 1.1421 1.1397 3.0180 1.1663 1.1662 1.1626 1.1598 1.1535 1.1547 1.1450 1.1423 2.8168 1.1977 1.1862 1.1771 1.1802 1.1691 1.1669 1.1555 1.1538 2.6156 1.2316 1.2129 1.1990 1.2029 1.1911 1.1851 1.1714 1.1692 2.4144 1.2696 1.2386 1.2194 1.2250 1.2116 1.2020 1.1873 1.1840 2.2132 1.3032 1.2642 1.2400 1.2475 1.2326 1.2193 1.2037 1.1992 2.0120 1.3453 1.2915 1.2606 1.2702 1.2531 1.2356 1.2189 1.2136 1.8108 1.3836 1.3173 1.2807 1.2925 1.2729 1.2511 1.2332 1.2276 1.6096 1.4225 1.3421 1.2986 1.3126 1.2908 1.2652 1.2463 1.2405 1.4084 1.4596 1.3634 1.3143 1.3306 1.3065 1.2774 1.2577 1.2519 1.2072 1.4952 1.3843 1.3283 1.3468 1.3204 1.2882 1.2679 1.2621 1.0060 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.8048 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.6036 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.4024 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.2012 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Unit2 Cycle 4 WATTS BAR Page 9 of 11 Revision 0

Table A.2 FQw(Z) Penalty Factor Cycle Burnup Ff (Z) Penalty (MWD/MTU) Factor 8296 1.0200 8485 1.0215 8675 1.0231 8864 1.0247 9054 1.0261 9243 1.0250 9433 1.0234 9622 1.0218 9812 1.0202 10001 1.0200 Note:

1. The Penalty Factor, which is applied to Fow(z) for compliance with Surveillance Requirement 3.2.1.2, is the maximum factor by which Fow(Z) is expected to increase per 31 Effective Full Power Days (EFPD) starting from the burnup at which the FQw(z) was determined. This Penalty Factor is applicable for both sets ofW(Z) Surveillance Factors provided in Tables A.1 and A.3.

Unit2 Cycle4 WATTS BAR Page 10 of 11 Revision 0

Table A.3 RAOC W(Z) Surveillance Factors (Perturbed Model) for D-AO of~ -6% and~ 0%

Max W(z) at 150 Max W(z) at 2000 Max W(z) at 8000 Max W(z) at 12000 MaxW(z) at 14000 Max W(z) at 16000 MWD/MTU (100% MWD/MTU (100% MWD/MTU (100% MWD/MTU (100% MWD/MTU (100% MWD/MTU (100%

Heiaht /ft\ Power\ Power\ Power) Power\ Power) Power) 12.0720 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.8708 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.6696 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.4684 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.2672 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.0660 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10.8648 1.2637 1.2649 1.2628 1.2382 1.2426 1.2337 10.6636 1.2575 1.2582 1.2569 1.2263 1.2388 1.2361 10.4624 1.2506 1.2556 1.2499 1.2216 1.2339 1.2406 10.2612 1.2414 1.2498 1.2409 1.2142 1.2275 1.2304 10.0600 1.2304 1.2411 1.2301 1.2094 1.2198 1.2164 9.8588 1.2221 1.2313 1.2187 1.2114 1.2140 1.2094 9.6576 1.2166 1.2208 1.2076 1.2113 1.2092 1.2030 9.4564 1.2150 1.2142 1.2018 1.2090 1.2033 1.1994 9.2552 1.2134 1.2144 1.1981 1.2052 1.1968 1.2006 9.0540 1.2100 1.2128 1.1950 1.2122 1.1919 1.2062 8.8528 1.2028 1.2081 1.1890 1.2206 1.1991 1.2076 8.6516 1.2009 1.2060 1.1905 1.2290 1.2033 1.2108 8.4504 1.2065 1.2076 1.1970 1.2418 1.2108 1.2232 8.2492 1.2108 1.2104 1.2012 1.2512 1.2242 1.2395 8.0480 1.2132 1.2111 1.2040 1.2576 1.2357 1.2520 7.8468 1.2142 1.2105 1.2050 1.2616 1.2448 1.2620 7.6456 1.2122 1.2070 1.2032 1.2621 1.2505 1.2686 7.4444 1.2087 1.2023 1.2000 1.2607 1.2544 1.2732 7.2432 1.2033 1.1954 1.1942 1.2558 1.2548 1.2740 7.0420 1.1972 1.1890 1.1875 1.2487 1.2529 1.2723 6.8408 1.1941 1.1847 1.1831 1.2397 1.2488 1.2682 6.6396 1.1895 1.1787 1.1790 1.2283 1.2424 1.2617 6.4384 1.1840 1.1717 1.1741 1.2161 1.2346 1.2537 6.2372 1.1775 1.1649 1.1681 1.2070 1.2249 1.2433 6.0360 1.1730 1.1599 1.1606 1.1968 1.2134 1.2311 5.8348 1.1679 1.1537 1.1534 1.1850 1.2001 1.2170 5.6336 1.1621 1.1469 1.1486 1.1719 1.1854 1.2013 5.4324 1.1581 1.1432 1.1447 1.1595 1.1701 1.1834 5.2312 1.1554 1.1420 1.1435 1.1532 1.1597 1.1723 5.0300 1.1522 1.1416 1.1407 1.1512 1.1542 1.1666 4.8288 1.1499 1.1403 1.1376 1.1476 1.1495 1.1604 4.6276 1.1466 1.1384 1.1352 1.1434 1.1439 1.1532 4.4264 1.1427 1.1360 1.1331 1.1386 1.1375 1.1452 4.2252 1.1379 1.1329 1.1304 1.1331 1.1307 1.1365 4.0240 1.1324 1.1291 1.1271 1.1273 1.1235 1.1275 3.8228 1.1267 1.1251 1.1233 1.1206 1.1153 1.1172 3.6216 1.1197 1.1203 1.1188 1.1132 1.1064 1.1060 3.4204 1.1199 1.1216 1.1169 1.1076 1.0984 1.0966 3.2192 1.1251 1.1244 1.1179 1.1070 1.0951 1.0907 3.0180 1.1288 1.1313 1.1232 1.1074 1.0954 1.0908 2.8168 1.1418 1.1479 1.1379 1.1165 1.1021 1.0979 2.6156 1.1615 1.1678 1.1572 1.1315 1.1137 1.1076 2.4144 1.1799 1.1867 1.1757 1.1454 1.1258 1.1185 2.2132 1.1987 1.2061 1.1948 1.1598 1.1381 1.1306 2.0120 1.2175 1.2254 1.2135 1.1733 1.1494 1.1414 1.8108 1.2358 1.2463 1.2315 1.1861 1.1600 1.1514 1.6096 1.2522 1.2652 1.2480 1.1978 1.1698 1.1608 1.4084 1.2666 1.2821 1.2625 1.2080 1.1783 1.1690 1.2072 1.2795 1.2973 1.2754 1.2170 1.1858 1.1763 1.0060 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.8048 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.6036 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.4024 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.2012 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 Unit2 Cycle4 WATTS BAR Page 11 of 11 Revision 0

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