ML18270A352

Revision 0 of the Cycle 16 Core Operating Limits Report (COLR)

ML18270A352
Person / Time
Site:	Watts Bar
Issue date:	09/27/2018
From:	Simmons P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML18270A352 (12)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 September 27,2018 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

10 cFR 50.4 Watts Bar Nuclear Plant, Units 1 and 2 Facility Operating License Nos. NPF-90 and NPF-96 NRC Docket Nos. 50-390 and 50-391 UNIT 1 REVISION O OF THE CYCLE 16 CORE OPERATING LIMITS REPORT (coLR)Pursuant to Watts Bar Nuclear Plant Technical Specifications (Tech Spec) Section 5.9.5.d, Tennessee Valley Authority (TVA) has enclosed Revision 0 of the Unit 1 Cycle 16 COLR. The analytical methods used to determine the core operating limits were previously reviewed and approved by the NRC.There are no regulatory commitments contained in this letter or the enclosure.

Should you have questions regarding this submittal, please contact Kim Hulvey at (23) 365-7720.Paul Simmons Site Vice President Watts Bar Nuclear Plant Respectfull U.S. Regulatory Commission Page 2 September 27,2018

Enclosures:

Watts Bar Nuclear Plant, Unit 1, Cycle 16 Core Operating Limits Report, Revision 0, August 2018 cc (Enclosure):

NRC Regional Administrator - Region ll NRR Project Manager NRC Senior Resident lnspector ENCLOSURE 1 Watts Bar Nuclear Plant, Unit 1, Gycle 16 Gore Operating Limits Report Revision 0 August 2018 OA Record 136 180815 802 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 16 CORE OPERATING LIMITS REPORT Revision 0 August 2018.'I t I t'1" *,"' , fi J. C. Bell. PWR Fuel Engineering

\ --l Verified by: Date Reviewed by: I lrrit I\\'r\'l'I'S RA t(tfu*Date I tuty L-t Date IE tr)at t,, t Dl:,:t, Cl cltl lrr I{ct isiutt i}Selter, el Eng Manager B.T J,Adfk Reactor Engineering Manaser Approved by: RC Chairman Plant Revision Date of PORC Approval Affected Pages Reason for Revision 0 See Above Ail lnitial lssue Ilitgc I ol' ()

1.0 CORE OPERATII\G LIMITS REPORT This Core Operating Limits Repgrt (COLR) for Watts Bar Unit I Cycle l6 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 lnsertion Limits 3.1.7 Control Bank lnsertion Limits 3.2.1 Heat Flux Hot Channel Factor (F,t(Z))3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F^r*)3.2.3 Axial Flux Difference (AFD)3.9. I 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 COEFFTCTENT - MTC (LCO 3.1.4)2.1.1 The MTC limits are: The ARO/HZP - MTC shall be less positive than or equal to 0 Ak/ld'F (upper limit).With the measured BOL/ARO/HZP - MTC more positive than -3.277 x 10 5 AVld"F (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to 0 Ak/ld'F (upper limit) for all times in core life.The EOLIARO/RTP - MTC shall be less negative than or equal to-4.5 x l0-aAk/V"F (lower limit).2.1.2 The 300 ppm surveillance limit is: The measured 300 ppm IARO/RTP-MTC should be less negative than or equal to -3.75 x l0-a 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 104 Ak/k/"F.Unit I Cycle 16 WATTS BAR Page2 of 9 Revision 0

2.2 SHUTDOWN

MARGIN- SDM (LCO 3.1.5,3.I.6,3.1.7) 2.2.1 For TS 3. I .5, SDM shall be > I .6% Aklk in MODE I and MODE 2.2.2.2 For TS 3.1.6, SDM shall be > 1.6% Ak/k in MODE I and MODE 2.2.2.3 For TS 3.1.7, SDM shall be > I .6% Ak/k in MODE I and MODE 2 with keff> 1.0.2.3 SHUTDOWN BAr\K TNSERTION LIMTTS (LCO 3.r.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 TNSERTTON LIMTTS (LCO 3.1.7)2.4.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure l.2.4.2Each confrol bank shall be considered fully withdrawn from the core at greater than or equal to 225 steps.2.4.3 T\e confrol 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)225 226 227 228 229 230 231 09 l0 ll l2 l3 t4 15 L6 l6 l6 l6 l6 l6 l6 2.5 HEAT FLUX TIOT CHAI\INEL FACTOR - rq(Z) (LCO 3.2.1)Fq(Z) < [CrQ/ P]

• K(Z) for P > 0.5 Fq(Z) < [CFQ/ 0.5]

• K(Z) for P s 0.5 Where P : Thermal Power/ Rated Thermal Power 2.5.1 CFQ:2.50 Unit I Cycle 16 WATTS BAR Page 3 of 9 Revision 0 2.5.2 K(Z) is provided in Figure 2.2.53 Faw(Z): Fo"(Z)

• W(Z)tp for p > 0.5 Fq"'(Z) : Fq"(Z)

• W(2y0.5 for P < 0.5 where: W(Z) values are provided in Table A.l. The table provides suffrcient 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 moveable incore detector system.2.3.5 Faw(Z) Penalty Factor the fowlZl penalty factor is provided in Table A.2.2.6 NUCLEAR ENTHALPY RrSE HOT CHANNEL FACTOR - F*n (LCO 3.2.2'F** S F**" * ( I + PF * ( l-p))where P - Thermal Power / Rated Thermal Power For*'o : I.65 for RF A-2 fuel, and PF :0.3 2.7 AXIAL FLUX DIFFEREI\CE - AFD (LCO 3.2.3)2.7.1 The AFD limits for Cycle 16 are provided in Figure 3.2.8 REFUELINGBORON CONCENTRATION (LCO 3.9.1)2.8.1 The refueling boron concentration shall be ) 2000 ppm.3.0 NUMBEROF TPBARS IN REACTOR CORE (TS 4.2.1)3.0. I There are 1584 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 16.Unit I WATTS BAR Cycle 16 Revision 0 Page 4 of 9 BANK A (ALL POWERS, 225)250 225 200 175 150 725 100 75 0,0 4.2 4.4 0.6 0.8 1.0 FRACTION OF RATEDTHERMAI POWER Figure I 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 and323l steps withdrawn.

2 3 u, o-F 3 vt o.UJ F lh;I ts Itl o c o.UI l-1n\,-z o o o E, Unit I WATTS BAR Cycle l6 Revision 0 Page 5 of 9 l-_(l)=o o-*o LL'r(J (1).N E E!-o z.1.2 1.1 1.0 0.9 0.8 o.7 0.6 0.5 o.4 0.3 o.2 o.1 o Unit I WATTS BAR 0 2 4 6 I 10 Core Height (feet)Figure 2 K(Z) - hlormalized Fq(Z) as a Function of Core Height 12 Cycle l6 Revision 0-r L>_--t__-_t I I I Core Height i o.ooo j 6.000 I i 12.000 (Page 6 of9 120 110 100 90 80 40 30 20 10-50 4A-30-20-10 0 10 Flux Difference (Al) %2A 30 40 50 Figure 3 Axial X'lux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)b=o rL 7A iE E L-o foo E o*(o Yso o s Unit I WATTS BAR Cycle 16 Revision 0{Ha j L_Pl--(7, 10-I 0)r I\lr d rble on 7]ffi:i,I t I I IL\ll ncceptal Cperatior l'" t--_l unacceptaue r J operation L-I T I\\-t I\I\I I I\ts Page 7 of9 Unit I WATTS BAR Table A.l RAOC W(Z) Surveillance Factors Cycle l6 Revision 0 Height (ft)Max W(z)at 150 IIIWD/MTU (30%Power)Max W(z)at 150 MWDIMTU (7$Yo Power)Max W(z)at 150 MWD/MTU (100%Powerl Max W(z)at 3000 MWD/MTU (100%Powerl Max W(z)at 6000 MWD/MTU (100%Power)Max W(z)at 8000[,IwD/MTU (100%Power)Max W(z)at 12000 MWD/MTU (100%Powerl Max W(z)at 16000 MWD/MTU (100%Power)Max W(z)at 18000 IIWD/MTU (100%Powerl 12 0742 1 0000 1.0000 1.0000 1.0000 1.0000 1,0000 1.0000 1.0000 1"0000 11,8730 1.0000 1.0000 1 0000 1.0000 1.0000 1.0000 1,0000 1.0000 1.0000 11 .6717 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11 47A5 1.0000 1"0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1 0000 11.2693 1.0000 1.0000 1.0000 1.0000 1,0000 1.0000 1.0000 1.0000 1.0000 11.0680 1.0000 1.0000 1 0000 1.0000 1,0000 1"0000 1,0000 1.0000 1.0000 10.8668 1 .3815 1.4258 1.2750 1.3559 1.2674 1.2444 1.1422 1.1521 1.1763 10,6655 1 3698 1.4012 1 2723 1.3495 1.2636 1.2426 1.1412 1,1502 1 .1693 10.4643 1,3580 1.3751 1"2668 1.3/.02 1.2574 1.2007 1 1380 1.1458 1.1633 10,2631 1.3447 1.3468 1 2611 1.3286 1.2494 1"1971 1,1 335 1.1400 1 1576 10.0618 1.3261 1.3142 1.2554 1 .3155 1_2404 1.1918 1.1269 1.1322 1.1510 9.8606 1.3078 1.2785 1 2479 1.3012 1 2319 1.1846 1.1243 1 1280 1.1433 9.6594 1.2867 1"2484 1.2393 1.2857 1.2243 1.1776 I 1257 1.1276 1.1366 9.4581 1.2664 1.2219 1.2329 1.2693 1.2181 1"1783 1.1249 1.1269 1.1342 9 2569 1.2443 1,1973 1.2263 1.2561 1.2182 1.1795 1 1269 1.1243 1.1366 9.0557 1 .2171 1.',1762 1.2184 1.2483 1.2180 1.1797 1.1277 1.1252 1 .1430 8.8544 1.1860 1,1558 1.2487 1.2422 1.2143 1 1789 1.1287 1.1307 1.1485 8.6532 1.1563 1.1391 1.2006 1.23l2 1.2096 1"1790 1.1353 1.1410 1.'t559 8.4519 1.1326 1.1308 1 .1 994 1.2260 1.2A57 1.1830 1.1455 1.1578 1.1736 8.2507 1.1100 1.1246 1 .1 987 1.2191 1.20A2 1.1850 1.1537 1,1726 1.1892 8.0495 1.0925 1.1201 1.1990 1.2118 1 1958 1.1849 1 1599 1.1849 1.2019 7 8482 1.0769 1.1167 1.1993 1.2034 1"1918 1.1834 1.1ils 1.1955 1.2130 7.6470 1.0625 1.1133 1 1977 1.1942 1.1859 1.1802 1"1674 1.2038 1.2216 7.4458 1.0489 1 1095 1.1942 1 .1 840 1.1787 1.1755 1.1686 1.2100 1_2279 7 _2445 1.0363 1,1056 1.1892 1.1744 1.1702 1_1695 1 1677 1.2140 1.2319 7_0433 1.0243 1 1000 11824 1.1668 1.1604 1.1615 1.1689 1.2160 1.2337 6.8420 1.0138 1.0945 1.1748 1 . 1616 1.1 543 1.1576 1.1709 1.2157 1.2331 6 6408 1.0077 1.0920 1 .1 700 1.1579 1.1531 1.1571 1.1707 1.2136 1.2305 6.4396 1.0078 1.0945 1.1699 1.1540 1 1501 1"1569 1,1697 1.2102 1.2263 6.2383 1.0090 1.0967 1.1690 1.1496 1.1454 1j547 1.1672 1.2049 1.2202 6.0371 1.0094 1.0969 1 .1658 1.1463 1.1418 1,1513 1_1628 1.1977 1.2119 5.8359 1.0123 1 0982 1,1637 1 1431 1.1388 1.1462 1 1584 1.1887 1"2018 5.6346 1,0178 1.1018 1,1635 1 .1 385 1.1 354 1.1406 1.1556 1"1779 1.1898 5.4334 1.0230 1.1045 1.1617 1.1330 1.1326 1.1 381 1.1534 1"1679 1-1777 5.2322 1.0284 1.1064 1.1589 1.1267 1.1309 1 1384 1_1528 1.1675 1.1707 5.0309 1.0338 1.1072 1.1552 1.1197 1.1299 1.1396 1.1524 1.1689 1.1699 4.8297 1.0393 1 .1071 1"1505 1.1120 1.1287 1.1406 1"1530 1 1701 1 1708 4.6284 1.4447 1.1064 1.1451 1.1038 1.1270 1.1411 1,1568 1.170/.1.1700 4.4272 1.0498 1 1A52 1"1389 1.0952 1.1248 1.1410 1.1609 1.1699 1.1684 4.2260 1,0552 1 1035 1"1321 1.0864 1.1222 1.1404 1.1il7 1.1703 1.1663 4.4247 1.0608 1.1015 1 1247 1.0771 1 1191 1,1394 1.1682 1 .1719 1.1632 3.8235 1.0670 1.0993 1"1169 1.4707 1.1159 1 .1 382 1.1715 1.1730 1.1614 3.6223 1.0727 1.0967 1.1087 1.0698 1 1123 1.1366 1 .1 746 1,1749 1.1617 3.4210 1.0795 1.0950 1.1016 1.A722 1.1093 1.1348 1.1776 1"18',17 1,1673 3.2198 1.0947 1.1011 1.1024 1,0749 1.1109 1.1369 1,1837 1.1899 1.1723 3.0186 1.1113 1.1078 1,1040 1.4764 1 117 1 1.1446 1.1933 1.1969 1.1783 2.8173 1.130't 1.1165 1.1074 1.0839 1.1302 1.1594 1.2096 1.2106 1.1921 2.6161 1.1564 1.1319 1,1172 11002 1.1491 1 1798 1.2322 1.2333 1,213r'.2.4148 1.1868 1.1502 1.1299 1.1 158 1.1677 1.1997 1.2537 1_2543 1.2332 2.2136 1.2182 1.1685 1.1424 1.1315 1.1862 1 2193 1"2746 1.27M 1.2524 2"4124 1,2491 1.1861 1.1540 1.1468 1.2044 1.2385 1.2946 1,2938 1.2748 1 8111 1.2817 1.2042 1.1660 1.1614 1,2218 1.2568 1.3135 1.3118 1,2881 1.6099 1.3126 1.2224 1.1782 1.1750 1,2380 1.2738 1"3308 1.3283 1.3040 1.4087 1 3387 1.2380'1.1883 1.1866 1.2520 1.2883't.3453 1.3/21 1,3173 1.2474 1.3613 1.2501 1.1948 1.1947 1.2623 1"2990 1.3556 1.3516 1.32U 1"0062 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000't.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't.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 o"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 Page 8 of 9 Table 4.2 Fqtt'(Z) Penalty Factor Note: l. The Penalty Factor, which is applied to Faw(Z) for compliance with Surveillance Requirement 3.2.1.2, is the maximum factor by which Fq'(Z) is expected to increase per 3l Effective Full Power Days (EFPD) starting from the burnup at which the Fqwlz; was determined.

Core Burnup (MWD/MrU)Fe'n (z)Penalty Factor All Burnups 1.0200 Unit I WATTS BAR Cycle 16 Revision 0 Page 9 of 9