ML17279A078

Revision 2 of the Cycle 1 Core Operating Limits Report (COLR)

ML17279A078
Person / Time
Site:	Watts Bar
Issue date:	10/06/2017
From:	Simmons P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML17279A078 (13)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 October 6, 2017 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 2 OF THE CYCLE 1 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 2 of the Unit 2 Cycle 1 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.

Respectfully, .a Paul Simmons Site Vice President Watts Bar Nuclear Plant

Enclosure:

Watts Bar Nuclear Plant, Unit 2, Cycle 1 Core Operating Limits Report Revision 2 September 2017

U.S. Nuclear Regulatory Commission Page 2 October 6, 2017 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, Unat 2, Cycle 1 Core Operating Limits Report Revision 2 September 2017

QA Record

.136 174922 8A1 WATTS BAR NUCLEAR PLANT, UN IT 2. CYCLE CORE OPERATING LIMITS REPORT Revision 2 September 2A17 Prepared by:

.A. Setter, t nlu-laor:t ngrneenng Date Verified by.

Engineering Date Reviewe$ by:

I Carey, uclear Safelf Analysis M er for C.A. Setter, PWR Fuel Engineering nager ngineering Manager C Chairrnan Plant Date of PORC PORC Meeting Affected Revision Approval Number Paqeb Reason for Revision 0 8127t2014 4439 all initial issue deleted equation shown on header of 1 9124t2015 4478 1.9 Table A. 1 2 See above. yg# 1,3 EOL MTC limits are conected to address CRs 1 330505 and 1341061 jr.?/*tr*

Unit 2 CiSrcle I WATTS BAR Pagc I ofI0 Rcvision 2

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 2 Cycle I 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) 3.1.6 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 (FaH*)

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 HotZero Thermal Power EOL End of Cycle Life RTP Rated Thermal Power Unit 2 Cycle I WATTS BAR Page 2 of l0 Revisi on 2

I I

2.1 MODERATOR TEMPERATURE COEFFTCTENT - MTC (LCO 3.r.4) 2.1.1 The MTC limits are:

The ARO/HZP - MTC shall be less positive than or equal to 0 Ak/k/oF (upper limit).

With the measured BOL/ARO/HZP - MTC more positive than -3.33 x lO-s Ak/ldoF (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to 0 Aldld'F (upper limit) for all times in core life.

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

-3.39 x l0-4 Ak/ldoF (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

-2.59 x l0-4 Ak/ld'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

-3.17 x l0-4 Ak/ld'F.

2.2 SHUTDOWN BANK TNSERTTON LTMTTS (LCO 3.1.6) 2.2.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps withdrawn.

2.3 CONTROL BANK TNSERTTON LTMTTS (LCO 3.1.7) 2.3.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure l.

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

2.3.3 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 I WATTS BAR Page 3 of l0 Revisi on 2

2.3.4 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 ll6 226 I l0 ll6 227 llt il6 228 n2 il6 229 I 13 ll6 230 tt4 ll6 23t I 15 I 16 2.4 HEAT FLUX HOT CHANNEL FACTOR - Fo(z) GCO 3.2.r)

Fq(Z) < [CFQ/ P]

• K(Z) for P > 0.5 Fq(Z) < [CFQ/ 0.s]

• K(Z) for P < 0.5 Where P = Thermal Power / Rated Thermal Power 2.4.1 CFQ =2.50 2.4.2 K(Z) is provided in Figure 2.

2.43 Faw(Z): Fq"(Z)

• W(ZYP for P > 0.5 Fq*(z) = Fq'(Z)

• w(z)10.5 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 bumups.

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

2.4.5 Faw(Z) Penalty Factor the f'ow1Z; penalty factor is provided in Table A.2.

Unit 2 Cycle I WATTS BAR Page 4 of 10 Revisi on 2

2.5 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR-F611N (LCO3.2.2)

For* s Far*" * ( I + PF * ( l-P))

where P - Thermal Power I Rated Thermal Power For*tt _ I .65 for RF A-2 fuel, and PF  : 0.3 2.6 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.6.1 The AFD limits for Cycle I are provided in Figure 3.

2.7 REFUELING BORON CONCENTRATION (LCO 3.9.1) 2.7.1 The refueling boron concentration shall be > 2000 ppm.

Unit 2 Cycle 1 WATTS BAR Page 5 of l0 Revisi on 2

z L75 3

E a

-E 150

.a

=

A EI l-Itl Y

z o L25 F

6 o

a o-EI l- 100 ln Y

z GT a 75 o

E, 0.2 0.4 0.5 0.8 1.0 FRACTION OF RATED THERMAT POWER Figure I 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 < 231 steps withdrawn.

Unit 2 Cycle I WATTS BAR Page 6 of l0 Revisi on 2

L,2 1.1 0.9 0.8 L.

o 3 0.7 o,

c, l!

t,o 0.6 LOre Hergnr K(z)

.!! 0.000 1.00( )

o 5.000 1.00( )

E o.s 12.000 1.00t )

o z

0.4 0.3 o,2 0.1 557 10 LL L2 Core Height (feet)

Figure 2 K(Z) - Normalized Fq(Z) as a Function of Core Height Unit 2 Cycle I WATTS B AR Page 7 of t0 Revisi on 2

120 110 100 90 80 Unacceptable Unacceptable o Operation Operation 8ro

=

E E

o f60 E'

o o

f50 o (21 , 50) s 40 30 20 10

-50 40 -30 -20 -10 0 10 20 30 40 50 Flux Difference (nlYt Axial Flux Difference Acceptable Operation #i:"":" function of Rated Thermal Power (RAoC)

Unit 2 Cycle I WATTS BAR Page 8 of 10 Revisi on 2

Table A.l NIax W(z) NIax W(z) N{ax W(z) Max W(z) N{ax W(z) NIax W(z) at 150 at 150 at 150 at 3000 at 8000 at 12000 IvIWD/I\,TTU 1\,IWDINITU N{WD,,'MTU IvtWD/MTU Iv{WDi'NITU MWD/N{TU Heisht tft) (30% Power) (754,b Power) (100o,,b Power) ( 100% Power) ( 100% Power) ( 1000,6 Power)

D.0724 1.0000 r.0000 1.0000 t.0000 1.0000 t.0000 l1.8708 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 tt.6696 1.0000 t.0000 1.0000 1.0000 1.0000 1.0000 l1.468{ 1.0000 1.0000 t.0000 1.0000 1.0000 1,0000 1t.2672 1.0000 1.0000 1.0000 1.0000 1.0000 t.0000 I1.0660 r.0000 r.0000 t.0000 1.0000 1.0000 1.0000 10.8648 1.4001 1.357I 1.2493 1.3471 1.3048 1.2486 10.6636 1.J687 1.3324 t.216e 1.3202 1.2851 r.2301 t0.4621 1.3021 1.2734 1.2471 1.J039 t.2628 1.2r00 10.26t2 1.2706 1.2464 t.21t2 1.2801 1.2381 t.1909 10.0600 1.2459 t.2278 r.2336 1.2535 1.2281 1.1746 9.8588 1.2103 1.2025 1.2183 1.2273 1.2205 1.1704 9.6576 t.r8l2 1.1850 1.2086 t.2177 l.2l t9 1.t728 9.{564 1.t711 1.t890 1.220e 1.2220 1.2074 1.1734 9.2552 1.1677 1.1942 r.2324 1.2238 t.204{ 1.t725 9.0s40 l.t6l0 1.2000 1.2434 1.2331 1.2086 1.1808 9.8528 l.l56l 1.2067 1.2553 1.2458 1.2162 r.r882 8.6516 t.l5l.l t.2tt7 1.2640 1.2725 t.2201 l.l92l 8..150.1 1.1537 t.2217 1.2771 1.2984 r.2J44 1.20{3 8.2492 r.1644 1.2395 1.2990 t.3178 1.2512 1.22s7 8.0480 t.r783 1.25e3 1.3218 1.3338 1.2702 1.24s8 7.8.168 l.l88{ 1.2743 1.3386 1.3437 1.2817 1.2619 7.6{56 1.1947 t.2846 1.3498 r.3486 1.2896 1.2750 7.4414 t.t982 1.2906 1.3s62 t.34e0 t.2942 r.28s4 7.2432 1.2005 r.2940 1.3588 1.3456 1.2955 t.2e26 7.0420 t.2017 1.2e50 1.3579 1.3387 t.2e37 1.2965 6.8408 1.r993 1.2920 1.3527 1.3281 1.2890 1.2974 6.6396 l.l9s0 1.28s8 1.3447 l.3l.l5 1.2825 1.2963 6.,t384 l.1886 1.2761 1.3J36 1.2981 t.2732 t.2925 6.2372 r.1820 1.2667 1.32r r 1.2798 1.2617 1.2860 6.0360 t.t742 1.2555 t.307t r.2s93 1.2480 1.2768 5.8348 l. t64s 1.2421 t.2906 1.2117 1.2326 1.2653 s.6336 1.1546 t.2277 1.2724 1.2295 1.2156 r.2sl3 5.4324 1.1498 1.2176 1.2590 t.2165 1.2032 1.238e s.2312 l.lsol t.2t29 1.2s02 1.2065 1.1959 1.237e s.0300 1.1485 t.2061 1.2399 1.1957 1.1879 1.2360 4.8288 1.1472 l.t99l r.2300 1.1837 1.1859 1.2321 1.6276 r.1457 1.1920 1.2t88 1.1778 1.1832 t.2279 1.4264 t.1422 1.1829 1.2061 1.1709 l.l 793 1.2213 4.2252 r.1384 1.1739 r.1938 r. t63 I l.l74l l.2l3l

{.02.10 1.1329 1.1637 l.r80J t.l53E r.1675 1.2030 3.8228 1.1298 1.1550 1.1674 1.1437 1.1596 l.l9l0 3.62t6 l.l28l l.l.t64 t.1555 1.1330 t.1507 1.1809 3.4204 1.1260 1.t385 1.1436 1.1246 1.t459 l.l7l9 3.21e2 l.l2s2 t.r3l4 1.133{ l.l 182 l.l.l07 1.1629 3.0180 l.lJ99 r.l40t l.l39l 1.1304 1.1465 t.1590 2.8168 t.1608 l.l55.l 1.1509 l. l{s4 t.t640 1.1728 2.6156 1.1832 1.1723 1.163E 1.t626 l.l8l3 1.1904 2.1111 1.2065 t.1898 l.l78l t.1796 1.t987 t.2479 2.2t32 t.2291 1.2065 l.lel8 1.1965 1.2158 1.2253 2.0120 r.2s43 t.2248 1.206s 1.2179 1.2397 1.2424 1.8108 l.2E0l t.2434 1.22 l s 1.2494 1.2720 1.2588 1.6096 1.3067 1.2627 t.2360 1.2785 1.3016 1.2717 1.4084 t.3328 r.2813 r.2s05 r.306t 1.3296 r.2903 1.2072 1.3628 1.3037 1.2650 1.3320 1.3555 1.30s2 1.0060 1.0000 1.0000 1.0000 1.0000 1.0000 r.0000 0.8048 1.0000 1.0000 1.0000 r.0000 1.0000 1.0000 0.6036 1.0000 t.0000 1.0000 r.0000 1.0000 1.0000 0.402{ 1.0000 1.0000 1.0000 1.0000 r.0000 1.0000 0.2012 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.0000 1.0000 1.0000 t.0000 1.0000 1.0000 1.0000 Unit 2 Cycle 1 WATTS BAR Page 9 of l0 Revisi on 2

Table A.2 Fq*(Z) Penalty Factor Core Fa,*(z)

Burnup Penalty (MWD/MTU) Factor 450 r.0200 s99 1.0222 749 1.0247 899 1.0263 1049 1.0267 I r99 1.0250 t349 1.0226 I 498 1.0200 Note:

l. The Penalty Factor, which is applied to Fq*(z) for compliance with Surveillance Requirement 3.2.1 .2, is the maximum factor by which Fqn (Z) is expected to increase per 3 I Effective Full Power Days (EFPD) starting from the burnup at which the Fo*(Z) was determined.

Unit 2 Cycle I WATTS BAR Page l0 of l0 Revisi on 2