ML12296A253

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Of the Cycle 12 Core Operating Limits Report (COLR)
ML12296A253
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 10/16/2012
From: James Shea
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML12296A253 (12)
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Text

Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 October 16, 2012 10 CFR 50.4 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NPF-90 NRC Docket No. 50-390

Subject:

REVISION 0 OF THE CYCLE 12 CORE OPERATING LIMITS REPORT (COLR)

The purpose of this letter is to provide Revision 0 of the Cycle 12 COLR in accordance with Watts Bar Nuclear Plant Technical Specification 5.9.5.d. Revision 0 defines the core operating limits for Cycle 12 operation.

There are no regulatory commitments contained in this letter or its enclosures. Please direct any questions concerning this matter to T. E. Cribbe at (423) 751-3850.

Respec

Ily, J.

.Shea Vc President, Nuclear Licensing

Enclosure:

Revision 0 of the Cycle 12 COLR cc (Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Watts Bar Nuclear Plant Printed onr~ ecycled paper

Enclosure WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 12 CORE OPERATING LIMITS REPORT

QA Record L36 120913 801 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 12 CORE OPERATING LIMITS REPORT Revision 0 September 2012 Prepared by:

Nuclear Fuel Reviewed by:

Date I q/ai/la..

Manager, Nuclear Fuel Engineering Date Reactor Engineering Manager Date Approved by: //

//

POR Chairman Plant Manager Date Date Revision

.0 4 Date of PORC Approval qlI2i) Lt PORC Meeting Number 43*30 Affected Pages all Reason for Revision initial issue I

Unit 1 Watts Bar Cycle 12 Revision 0 Page 1 of 10

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 1 Cycle 12 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 3.1.6 3.1.7 3.2.1 3.2.2 3.2.3 3.5.1 3.5.4 3.9.1 Moderator Temperature Coefficient (MTC)

Shutdown Bank Insertion Limits Control Bank Insertion Limits Heat Flux Hot Channel Factor (FQ(Z))

Nuclear Enthalpy Rise Hot Channel Factor (FmnN)

Axial Flux Difference (AFD)

Accumulators Refueling Water Storage Tank (RWST)

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 ARO HZP EOL RTP Unit 1 WATTS BAR Beginning of Cycle Life All Rods Out Hot Zero Thermal Power End of Cycle Life Rated Thermal Power Cycle 12 Revision 0 Page 2 of 10

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 0 Ak/k/0F (upper limit).

With the measured BOL/ARO/HZP - MTC more positive than -1.05 x 10. Ak/k/0F (as-measured MTC limit), establish control rod withdrawal limits to ensure the MTC remains less positive than or equal to 0 Ak/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 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/0F.

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/0F.

2.2 SHUTDOWN BANK INSERTION LIMITS (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 INSERTION LIMITS (LCO 3.1.7) 2.3.1 The control banks are fully withdrawn or shall be limited in physical insertion as shown in Figure 1.

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 1 WATTS BAR Cycle 12 Revision 0 Page 3 of 10

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) 225 226 227 228 229 230 231 Bank Overlap (steps) 109 1 10 111 112 113 114 115 Bank Difference(steps) 116 116 116 116 116 116 116 2.4 HEAT FLUX HOT CHANNEL FACTOR - FQ(Z) (LCO 3.2.1)

FQ(Z) _ [CFQ / P]

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

2.4.3 FoW(Z) = FQc(Z)

  • W(Z)/P for P > 0.5 FQW(Z)

FQC(Z)

  • W(Z)/0.5 for P _<

0.5 where

W(Z) values are provided in Table A. 1. The table provides sufficient information to determine W(Z) versus core height for all cycle burnups.

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

2.4.5 FQW(Z) Penalty Factor The FQW(Z) penalty factor is provided in Table A.2.

Cycle 12 Page 4 of 10 Revision 0 Unit 1 WATTS BAR

2.5 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR - FAHN (LCO 3.2.2)

FAHN S FAHRTP * ( 1 + PF * ( I-P))

where P = Thermal Power / Rated Thermal Power FAHRTP

= 1.65 for RFA-2 fuel, and PF

=0.3 2.6 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.6.1 The AFD limits for Cycle 12 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.

2.8 ACCUMULATORS (LCO 3.5.1) 2.8.1 There are 544 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 12.

2.9 REFUELING WATER STORAGE TANK - RWST (LCO 3.5.4) 2.9.1 There are 544 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 12.

Unit 1 WATTS BAR Cycle 12 Revision 0 Page 5 of 10

250 225 200 S175 150 o 125 t-IA0

ýu 100 (A

z 7o 0 75 50 25 0

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 < 231 steps withdrawn.

Unit 1 WATTS BAR Cycle 12 Revision 0 Page 6 of 10

L..

0~

LL

_0 CU 0Z 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0

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 WATTS BAR Cycle 12 Revision 0 Page 7 of 10

120 110 100 90 80 013-(D I-

"V U)

Cu 70 60 50 20 1 0.

0

-50

-40

-30

-20

-10 0

10 20 30 40 50 Flux Difference (AI) %

Figure 3 Axial Flux Difference Acceptable Operation Limits as a function of Rated Thermal Power (RAOC)

Unit 1 WATTS BAR Cycle 12 Revision 0 Page 8 of 10

Table A.1 FQW(Z) = FQC(Z)

  • W(Z)

Max W(z)

Max W(z)

Max W(z)

Max W(z)

Max W(z)

Max W(z) at 150 at 150 at 150 at 3000 at 10000 at 16000 MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU MWD/MTU Height (30%

(75%

(100%

(100%

(100%

(100%

01)

Power)

Power)

Power)

Power)

Power)

Power) 12.0760 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.8750 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.6730 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.4720 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.2710 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 11.0700 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 10.8680 1.3670 1.3506 1.2646 1.3042 1.2532 1.2140 10.6670 1.3485 1.3295 1.2613 1.2986 1.2483 1.2062 10.4660 1.3300 1.3081 1.2578 1.2902 1.2411 1.1965 10.2650 1.3170 1.2926 1.2597 1.2791 1.2255 1.1826 10.0630 1.3022 1.2753 1.2602 1.2706 1.2079 1.1716 9.8620 1.2830 1.2564 1.2576 1.2643 1.1880 1.1661 9.6610 1.2611 1.2387 1.2537 1.2560 1.1711 1.1624 9.4600 1.2354 1.2195 1.2470 1.2454 1.1689 1.1574 9.2580 1.2078 1.2004 1.2378 1.2364 1.1673 1.1562 9.0570 1.1815 1.1843 1.2298 1.2273 1.1659 1.1632 8.8560 1.1602 1.1741 1.2265 1.2196 1.1683 1.1770 8.6540 1.1443 1.1687 1.2270 1.2175 1.1809 1.1869 8.4530 1.1378 1.1733 1.2369 1.2211 1.1948 1.1970 8.2520 1.1320 1.1789 1.2474 1.2228 1.2062 1.2055 8.0510 1.1242 1.1826 1.2553 1.2224 1.2152 1.2120 7.8490 1.1147 1.1842 1.2602 1.2206 1.2220 1.2183 7.6480 1.1069 1.1846 1.2624 1.2171 1.2264 1.2258 7.4470 1.0992 1.1839 1.2621 1.2120 1.2285 1.2337 7.2460 1.0917 1.1814 1.2592 1.2050 1.2283 1.2391 7.0440 1.0850 1.1775 1.2540 1.1986 1.2260 1.2421 6.8430 1.0791 1.1727 1.2470 1.1937 1.2219 1.2428 6.6420 1.0728 1.1666 1.2386 1.1887 1.2164 1.2415 6.4410 1.0662 1.1590 1.2283 1.1818 1.2091 1.2387 6.2390 1.0590 1.1498 1.2160 1.1777 1.1999 1.2337 6.0380 1.0541 1.1425 1.2056 1.1733 1.1891 1.2266 5.8370 1.0506 1.1358 1.1955 1.1670 1.1769 1.2176 5.6350 1.0463 1.1279 1.1839 1.1594 1.1666 1.2066 5.4340 1.0446 1.1224 1.1744 1.1507 1.1620 1.1940 5.2330 1.0445 1.1183 1.1662 1.1438 1.1570 1.1819 5.0320 1.0480 1.1176 1.1615 1.1408 1.1527 1.1795 4.8300 1.0533 1.1185 1.1583 1.1392 1.1492 1.1799 4.6290 1.0575 1.1177 1.1533 1.1362 1.1469 1.1784 4.4280 1.0614 1.1161 1.1476 1.1327 1.1478 1.1763 4.2270 1.0652 1.1137 1.1412 1.1285 1.1485 1.1732 4.0250 1.0683 1.1106 1.1339 1.1237 1.1483 1.1694 3.8240 1.0712 1.1072 1.1263 1.1187 1.1486 1.1650 3.6230 1.0739 1.1031 1.1181 1.1132 1.1508 1.1600 3.4220 1.0765 1.0987 1.1096 1.1078 1.1547 1.1549 3.2200 1.0845 1.0995 1.1064 1.1086 1.1579 1.1532 3.0190 1.1018 1.1095 1.1125 1.1161 1.1660 1.1573 2.8180 1.1307 1.1315 1.1304 1.1314 1.1800 1.1717 2.6160 1.1610 1.1545 1.1492 1.1494 1.1963 1.1903 2.4150 1.1928 1.1780 1.1682 1.1713 1.2122 1.2081

  • 2.2140 1.2259 1.2020 1.1873 1.1933 1.2277 1.2254 2.0130 1.2591 1.2256 1.2059 1.2149 1.2435 1.2422 1.8110 1.2920 1.2487 1.2243 1.2361 1.2606 1.2584 1.6100 1.3238 1.2702 1.2412 1.2562 1.2777 1.2735 1.4090 1.3551 1.2902 1.2565 1.2745 1.2927 1.2869 1.2080 1.3954 1.3178 1.2788 1.2898 1.3059 1.2974 1.0060 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.8050 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.6040 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.4030 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 0.2010 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 Unit. 1, WATTS BAR Cycle 12 Revision 0 Page 9 of 10

Table A.2 FQw(Z) Penalty Factor Core FQ VV(Z)

B umup Pe nalty

................... u r n u

.................................... P n a ~..

y..

(MWD/MTU)

Factor

.......................... 1...............

.2.............................0 Note:

1. The Penalty Factor, which is applied to FQW(Z) for compliance with Surveillance Requirement 3.2.1.2.a, 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.

Unit 1 WATTS BAR Cycle 12 Revision 0 Page 10 of 10

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