L-19-029, Submittal of Revision 0 of Cycle 3 Core Operating Limits Report
| ML19114A113 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 04/24/2019 |
| From: | Anthony Williams Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| WBL-19-029 | |
| Download: ML19114A113 (13) | |
Text
Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 wBL-19-029 April24,2019 10 cFR 50 4 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391 Subject. REVISION O OF THE UNIT 2 CYCLE 3 GORE OPERATING LIMITS REPORT (COLR)
Pursuant to Watts Bar Nuclear Plant Technical Specifications Section 5.9.5.d, Tennessee Valley Authority (rVA) has enclosed Revision 0 of the Unit 2 Cycle 3 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 (423) 365-7720.
ectfully, onf L. Williams lV Site Vice President Watts Bar Nuclear Plant
Enclosure:
Watts Bar Nuclear Plant, Unit 2, Cycle 3 Core Operating Limits Report Revision 0 April 2019
U.S. Nuclear Regulatory Commission Page 2 April 24,2019 cc (Enclosure):
NRC Regional Administrator - Region ll NRR Project Manager - Watts Bar Nuclear Plant NRC Senior Resident lnspector - Watts Bar Nuclear Plant
ENCLOSURE Watts Bar Nuclear Plant, Unat2, Gycle 3 Core Operating Limits Report Revision 0 April 2019
QA Record 136 190228 800 WATTS BAR NUCLEAR PLANT, UNIT 2, CYCLE 3 CORE OPERATING LIMITS REPORT Radsion 0 April 2019 A. , PWR Fuel Engineering Verified by:
,4rl$..-
Fuel Ensineerins ($qhd W 1 Mack, Manager, Reaclor Engineering sIll Date of PORC Affected Revision Aoproval Pases Reagon for Revision 0 Se aborrc Al! lnitial issue Unit 2 Cycla 3 WATTS BAR Page 1 of 10 Revision 0
1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 2 Cycle 3 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 lnsertion Limits 3.2.1 Heat Flux Hot Channel Factor (Fq(Z))
3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (F*)
3.2.3 Axial Flux Difference (AFD) 3.9.1 BoronConcentration 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 Unit 2 Cycle 3 WATTS BAR Page 2 of 10 Revision 0
2.1 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.4) 2.1.1 The MTC limits are:
The ARO/LZP - MTC shall be less positive than or equal to 0 Ak/ldoF (upper limi!.
With the measured BOL/ARO/HZP - MTC more positive than -1.93 x l0-5 Ak/ldoF (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to 0 AldldoF (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/ld"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 104 AVk/oF.
2.1.3 The 60 ppm surveillance limit is:
The measured 60 ppm /ARO/RTP-MTC should be less negative than or equal to 4.29 x 104 ak/ld.F.
2.2 SHUTDOWN MARGIN - SDM (LCO 3.1.5,3.1.6,3.1.7) 2.2.1 For TS 3.1.5, SDM shall be > l.60/o Lklk inMODE I andMODE 2.
2.2.2 For TS 3.1.6, SDM shall be> l.6Yo LWk inMODE I andMODE 2.
2.2.3 For TS 3.1.7, SDM shall be> l.6Yo Lkk inMODE I andMODE2withhtr> 1.0.
2.3 SHUTDOWN BAI\K INSERTTON LIMITS (LCO 3.1.6) 2.3.1 The shutdown banks shall be withdrawn to a position greater than or eqlm,l to 225 steps withdrawn.
2.4 CONTROL BANK TNSERTTON LTMTTS (LCO 3.1.A 2.4.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure l.
2.4.2Each 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.
Unit 2 Cycle 3 WATTS BAR Page 3 of l0 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 I l6 226 t0 l l6 227 11 l l6 228 t2 I l6 229 113 ll6 230 tL4 116 23t I l5 I l6 2.5 HEAT FLUX HOT CHANNEL FACTOR -Fq(Z) (LCO 3.2.1)
Fq(Z) < ICFQ I P]* K(Z) for P > 0.5 rq(Z)< [CFQ/0.5] *K(Z) forP<0.5 Where P - Thermal Power lRated Thermal Power 2.5.1 CFQ =2.50 2.5.2 K(Z) is provided in Figure 2.
z.s.l ro*12; = Fo'(Z)
- w(Z)lP for P > 0.5 Fq*(Z) = Fa'(Z)
- W(Z)t0.5 for P < 0.5 where: W(Z) values are provided in Table A.l. The table provides 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.
Z.S.S r rw 121 Penalty Factor The Faw(Z) penalty factor is provided in Table A.2.
Unit 2 Cycle 3 WATTS BAR Page 4 of l0 Revision 0
2.6 NUCLEAR ENTHALPY RISE HOT CHAIINEL FACTOR - FalN (LCO 3.2.2)
For*S F*^tt * ( I + pF * ( l-p))
where P - Thermal Power lRated Thermal Power For*tt : 1.65 for RF A-2 fuel, and PF : 0.3 2.7 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.7.1 The AFD limits for Cycle 3 are provided in Figure 3.
2.8 REFUELING BORON CONCENTRATION (tCO 3.9.1) 2.8.1 The refueling boron concentration shall be > 2000 ppm.
Unit 2 Cycle 3 WATTS BAR Page 5 of l0 Revision 0
254 225
.A z L75 3
c, o
-E I
3 150 tt a.
UI F
!g z
o L25
-F6 o
a.
G lrl 100 F
Itt
-z o
o o
c, 0.0 o.2 o.4 0.5 0.8 1.0 FRACTION OF RATED THERMAT 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 2225 anld323l steps withdrawn.
Unit2 Cycle 3 WATTS BAR Page 6 of l0 Revision 0
0.8 L
o E 0.7 o.
c, U.
rE 0.6 o
e(E
0.s zo
0.4 2345678910 Core Height (feet)
Figure 2 K(Z) - Normalized Fq(Z) as a Function of Core Height Unit 2 Cycle 3 WATTS BAR Page 7 of 10 Revision 0
120 110 100 90 80 o
3 o
o- 70 E
E o
foo E'
g o
fso o
s 4A
-50 40 -30 10 0 10 20 30 40 50 Flux Difference (Al) %
Figure 3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)
Unit 2 Cycle 3 WATTS BAR Page 8 of 10 Revision 0
Table A.1 RAOC W(Z) Surveillance Factors Max W(z) at Max W(z) at Max W(z) at Max W(z) at Max W(z) at Max W(z) at Max W(z) at Max W(z) at ls0 150 150 2000 4000 8000 12000 16000 MWD/MTU MWDIN{TU MWDA4TU MWDA,ITU MWD/MTU MWD/MTU MWDA{TU MWDA4TU Heisht (ft) (30o/o Power) (7s%Power) (l00oh Power) (1004/oPower) fi$0o/o Power) (100o/o Power) (l0oo/oPowcr) (100o/o Power) 12.0720 1.0000 1.0000 1.0000 1.0000 .0000 1.0000 1.0000 1.0000 r 1.8708 1.0000 1.0000 1.0000 1.0000 .0000 1.0000 1.0000 1.0000 l 1.6696 1.0000 1.0000 r.0000 r.0000 .0000 1.0000 1.0000 1.0000 l 1.4684 1.0000 1.0000 1.0000 1.0000 .0000 1.0000 1.0000 1.0000 n.2672 r.0000 1.0000 1.0000 1.0000 .0000 1.0000 1.0000 r.0000 I1.0660 1.0000 1.0000 1.0000 1.0000 .0000 r.0000 r.0000 1.0000 10.8648 1.2400 1.2668 l. l 709 1.2105 .2456 l.1685 t.ls36 r.r475 10.6636 r.23t7 1.2490 1.167 l 1.2043 .1950 l. 6ll r.1479 t.t47 t 10.4624 r.2260 1.2347 1.1640 r.2038 .r976 l. 591 1.1403 1.1458 r0.2612 t.2t7t t.2200 l.l61t 1.2003 .195 r l. 559 1.1399 t.1440 10.0600 r.2078 r.2482 1.1597 1.1943 .r962 l. 544 l.1398 r.t424 9.8588 l. 977 t.t95l r.1630 r.1877 .t952 t. 543 1.1391 1.1484 9.6576 l. 833 r. r 800 1.1645 l. I 802 .t922 l. s66 1.1377 r.15s2 9.4564 l. 639 t.1647 1.1639 r. l 833 .1961 l. 572 1.1433 l. I 593 9.2552 I 536 1.1566 1.1695 1.1 830 .l9l I l. 564 t.ts52 1.1682 9.0540 l. 466 l. l 504 1.1790 l. l 830 .1 870 l. 547 t.t674 t.1752 8.8528 t. 284 t.1466 1.1843 1.1836 .1844 t. 510 1. t 763 t.t787 8.6516 I l5l t.t42l 1.1 888 1.1887 r859 l. 499 1. I 880 1.t799 8.4s04 t. 078 1.1436 1.1999 l.l94l .1903 t. 603 1.2048 l. I 829 8.2492 I 120 l. r s63 r.2 r30 1.1983 .1938 l. 760 t.22A6 t.1937 8.0480 r.0973 l.l5l3 t.2233 r.2003 .1950 l. 886 1.2344 r.2042 7.8468 1.0922 l. l 558 r.231 l 1.2004 .r946 1. 990 t.2458 1.2159 7.6456 1.0891 l. l 588 1.2349 l. l97s .19r3 t.2063 r.2s38 t.2288 7.4444 1.0835 l. r 593 t.2366 l.1934 l 867 1.2118 1.2598 1.2393 7.2432 1.0789 l. I 596 r.23s8 l. I 886 .1799 t.2t48 r.2624 t.2465 7.0420 1.0748 1.1 584 1.2334 l. l 828 1730 1.21s8 r.2626 1.2512 6.8408 t.07t2 t.t562 t.2286 l. I 790 .1692 t.2t47 r.2604 r.2536 6.6396 1.0649 l. I 506 t.22t6 l. I 750 .1651 l.2l l8 t.2560 t.2s32 6.4384 1.061I r.1460 r.2t36 l. l 703 .t602 1.2076 t.2498 r.2516 6.2372 1.0557 r.r400 t.2045 t.t647 .1544 1.2019 1.24t4 t.2478 6.0360 1.0519 r. l 333 l.1937 1.1592 .1470 l. 944 r.231 l 1.2418 5.8348 1.0435 r.1232 l. l 809 1. I 553 .t426 l. 851 1.2185 t.2337 5.6336 1.0404 t.l 169 l. t 69l 1. I 509 I 385 l. 745 1.2042 1.2238 5.4324 1.0441 l.l 160 t.1647 1.1468 .1363 l. 634 r. I 895 t.2107 5.2312 1.0521 l .l 195 l.1639 t)444 .1365 l. 62s 1.1 885 r.2032 5.0300 1.0607 t.t22l t.1620 r.1437 1377 l. u3 t.t877 1.2020 4.8288 t.0676 t.t240 l. l 598 r.1447 1394 l. @7 1.1855 1.1983 4.6276 r.0769 t.t277 1.1 589 r.1462 .1413 l. 642 1.1821 1.1933 4.4264 1.0876 l.1320 1.1s77 t.t470 .1425 l. 627 r.r776 l. I 870 4.22s2 t.0942 1.r332 t. I 555 1.1470 .1430 l. 603 l.l7l9 t.t796 4.0240 1.0995 t.t342 1.1523 t.1462 .1428 l. 567 L.r6s2 l.t7t2 3.8228 t. 095 l.1355 l.1486 r.1451 .1422 l. s36 t.1576 1.16r3 3.62t6 l. 206 1.1387 1.1472 r.t434 . r413 l. 507 1 .1 535 t. r555 3.4204 t. 340 1.1460 l. I 503 l.l43l 1393 l. s03 1.1509 1.1512 3.2192 I 541 r. I 563 l. I 548 L1450 .1418 I s02 1.1486 l.l52l 3.0180 l. 7t5 l. I 670 l.l6l8 1.1468 1550 l. s35 1.1556 1. r 565 2.8r68 1.2a45 1.1904 t.1797 1.1598 .1761 t. 647 r. l 700 1.1693 2.6rs6 t.2427 l.2l9l 1.2033 1.1849 .1991 t. 775 1 .1 828 t. r 870 2.4r44 r.2791 t.24s8 r.2262 1.2086 .2217 l. 89s t.1957 r.2032 2.2132 r.3138 t.2739 t.2492 t.2330 .2445 1.20t6 r.2085 1.2197 2.0120 1.3571 1.3028 1.2724 1.2575 .2674 r.2t33 r.220s r.2349 1.8108 r.3973 1.33 r9 t.295t 1.2816 .2898 r.2242 r.2316 r.2487 1.6096 t.4326 r.3573 1.3160 r.3039 3105 t.2341 1.24t7 1.26t5 1.4084 t.4736 1.3828 1.33s0 t.3243 .3293 t.2431 r.2513 r.2737 t.2072 1.5094 1.4059 t.3524 1.3427 .3462 1.2510 1.2600 t.2852 1.0060 1.0000 r.0000 1.0000 1.0000 .0000 1.0000 1.0000 1.0000 0.8048 1.0000 r.0000 1.0000 r.0000 .0000 r.0000 1.0000 1.0000 0.6036 1.0000 r.0000 1.0000 r.0000 .0000 1.0000 1.0m0 1.0000 0.4024 1.0000 r.0000 1.0000 1.0000 .0000 1.0000 r.0000 1.0000 0.2012 1.0000 r.0000 1.0000 1.0000 .0000 1.0000 r.0000 1.0000 0.0000 1.0000 1.0000 1.0000 1.0000 .0000 1.0000 1.0000 1.0000 Unit 2 Cycle 3 WATTS BAR Page 9 of l0 Revision 0
Table L.2 Fq*(Z) Penalty Factor Burnup Penalty (MWD/MTU) Factor 448 1.0200 597 1.0205 746 t.0221 89s 1.023s t043 1.0227 rr92 1.0200 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 fqw1Z1 was determined.
Unit 2 Cycle 3 WATTS BAR Page 10 of 10 Revision 0