ML063320182

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Watts Bar, Unit 1 - Core Operating Limits Report for Cycle 8, Revision 2
ML063320182
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 11/21/2006
From: Smith J D
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML063320182 (22)
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Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 November 21, 2006 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Gentlemen:

In the Matter of the ) Docket No. 50-390 Tennessee Valley Authority

)WATTS BAR NUCLEAR PLANT (WBN) UNIT 1 -CORE OPERATING LIMITS REPORT (COLR) FOR CYCLE 8, REVISION 2 The purpose of this letter is to provide Revision 2 of the Cycle 8 COLR in accordance with WBN Technical Specification 5.9.5.d. Revision 2 clarifies the text of Section 2.3.1 associated with control bank insertion limits. This revision was effective as of November 9, 2006.There are no regulatory commitments associated with this submittal.

If you have any questions concerning this letter, please contact me at (423) 365-1824.Sincerely, J. D. Smith Manager, Site Licensing and Industry Affairs (Acting)

Enclosure:

Watts Bar Nuclear Plant Unit 1, Cycle 8 Core Operating Limits Report, Revision 2 cc: See Page 2 Printed on recycled paper U.S. Nuclear Regulatory Commission Page 2 November 21, 2006 Enclosure cc (Enclosure):

NRC Resident Inspector Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381 Douglas V. Pickett, Senior Project Manager U.S. Nuclear Regulatory Commission MS 08G9a One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 Enclosure Watts Bar Nuclear Plant Unit 1 Cycle 8 Core Operating Limits Report, Revision 2 COLR for Watts Bar Unit 1, Cycle 8 QA Record L36 061109 803 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 8 CORE OPERATING LIMITS REPORT Revision 2 November 2006 Prepared by:~~~1~ CT (1~A ~/-1916 Nuclear Fuel Date 7.Verified by: D--a_/Nuclear Fuel Date Rev' wedby: 7 tc Il[vb Manager, uci Fuel Design Date Reactor Engineerinl

ý)`ervisor Date Approved by: PORC Chairmanu Date Plant Man9 Date Date of PORC PORC Meeting Affected Revision Approval Number Pages Reason for Revision 0 N/A N/A N/A Not issued 1 N/A N/A 1, 9-13 Updated W(z) values, not issued 2 -11119!66

,,4/78I_ 3 Clarified text in 2.3.1 Unit 1 WATTS BAR Cycle 8 Revision 2 Page 1 of 19 COLR for Watts Bar Unit 1, Cycle 8 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit 1 Cycle 8 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 (FQ(Z))3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (FAHN)3.2.3 Axial Flux Difference (AFD)3.5.1 Accumulators

3.5.4 Refueling

Water Storage Tank (RWST)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 Unit I Cycle 8 WATTS BAR Page 2 of 19 Revision 2 COLR for Watts Bar Unit 1, Cycle 8 2.1 MODERATOR TEMPERATURE COEFFICIENT

-MTC (LCO 3.1.4)2.1.1 The MTC limits are: The BOL/ARO/HZP

-MTC shall be less positive than or equal to 0 Ak/k/°F (upper limit). With the measured BOL/ARO/HZP

-MTC more positive than-0.20 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 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 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/kI 0 F.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 Table 1 shows the control rod overlap positions.

Unit 1 WATTS BAR Cycle 8 Revision 2 Page 3 of 19 COLR for Watts Bar Unit 1, Cycle 8 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 FQc(Z) = FQM(Z)
  • 1.0815 where: FQM(Z) is the measured value of FQ(Z) obtained from incore flux map results and 1.0815 is a factor that accounts for fuel manufacturing tolerances and flux map measurement uncertainty.

2.4.4 FQw(Z) = FQc(Z)

  • W(Z)where: W(Z) values are provided in Figures 4 through 8. The figures provide sufficient information to determine W(Z) versus core height for all cycle burnups.2.4.5 FQw(Z) Penalty Factor The FQw(Z) penalty factor is provided in Table A. 1.Unit 1 WATTS BAR Cycle 8 Revision 2 Page 4 of 19 COLR for Watts Bar Unit 1, Cycle 8 2.5 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR -FAHN (LCO 3.2.2)FAHN < FAHRTP * ( 1 + PF * (1-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 8 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 240 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 8.2.9 REFUELING WATER STORAGE TANK -RWST (LCO 3.5.4)2.9.1 There are 240 tritium producing burnable absorber rods (TPBARs) in the reactor core for Cycle 8.Unit 1 Cycle 8 WATTS BAR Page 5 of 19 Revision 2 COLR for Watts Bar Unit 1, Cycle 8 250 231 225 200 z 0-U, F-U)z 0 P: 0~z 0 0 175 150 125 100 75 (0.074, 231) (0.632,231)

(0.048, 225) -ý0 --, -(0.0, 214) I ...BANK B (1.0, 187)OF BANK C.. .."/ ......:::OOF'Ai I I I'14BANK (0-0,86)AO* i Oi i* rPO 50 25 0 0 0.20 0.40 0.60 0.80 FRACTION OF RATED THERMAL POWER 1.00 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 8 Revision 2 Page 6 of 19 COLR for Watts Bar Unit 1, Cycle 8 U_0U z 1.2 1.1 1.0 -- -..____0.9 0.8 0.7 0.6 --Core Height KQZ)0.000 1.000 6.000 1.000 12.000 0.9256 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 Core Height (feet)10 12 Figure 2 K(Z) -Normalized FQ(Z) as a Function of Core Height Unit 1 WATTS BAR Cycle 8 Revision 2 Page 7 of 19 COLR for Watts Bar Unit 1, Cycle 8 120 110 100 90 ()0-0 4--0-0 80 70 60 50 40 30 20 10 0-50 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 1 WATTS BAR Cycle 8 Revision 2 Page 8 of 19 COLR for Watts Bar Unit 1, Cycle 8 1.50.~~~~ ~ ~ ~ I I I .I I I I I .I I I .-ý ..........i.1.40 1.30 1.20 1.10.........i i i i ! ; ; i i i ! i i i I i i i ý i i i ! i i i i ! i i 1 1 i 1 1 ..........I I I 1 --1 4 t -4 1 -I I I I II I I I I I I I ----- --f .... --I I I I I I I I I I i ! i ! i i f i -t i f i F Heioht Max.(fee" W(z)0.0000 1.0000 0.2000 1.0000 0.4000 1.0000 0.6000 1.0000 0.8000 1.0000 1.0000 1.0000 1.2000 1.4280 1.4000 1.4084 1.6000 1.3857 1.8000 1.3608 2.0000 1.3344 2.2000 1.3072 2.4000 1.2792 2.6000 1.2506 2.8000 1.2281 3.0000 1.2083 3.2000 1.1929 3.4000 1.1867 3.6000 1.1841 3.8000 1.1813 4.0000 1.1777 4.2000 1.1737 4.4000 1.1691 4.6000 1.1638 4.8000 1.1579 5.0000 1.1516 5.2000 1.1441 5.4000 1.1364 5.6000 1.1365 5.8000 1.1443 6.0000 1.1538 6.2000 1.1613 6.4000 1.1679 6.6000 1.1733 6.8000 1.1772 7.0000 1.1797 7.2000 1.1807 7.4000 1.1800 7.6000 1.1776 7.8000 1.1734 8.0000 1.1673 8.2000 1.1594 8.4000 1.1494 8.6000 1.1373 8.8000 1.1243 9.0000 1.1179 9.2000 1.1170 9.4000 1.1159 9.6000 1.1116 9.8000 1.1120 10.0000 1.1171 10.2000 1.1198 10.4000 1.1212 10.6000 1.1244 10.8000 1.1275 11.0000 1.0000 12 11.2000 1.0000 TOP 11.4000 1.0000 11.6000 1.0000 11.8000 1.0000 12.0000 1.0000 t>HI V 1I+[BL It> LPL Vt> I [I ~i !i i i ! ii h 1 i i 1 9h -f.I I I i ! 1 1 1 1 1 1 1 1 1 1 1 1 1 1 L .; .1 1 .-I. I; I Hill I 0 1 2 3 4 5 6 7 8 9 10 11 TTOM CORE HEIGHT (FEET)1.00 BO Figure 4 RAOC Summary of Max W(z) at 150 MWD/MTU with HFP AFD Band of -12/+6 %(Top and Bottom 10% Excluded)Unit 1 WATTS BAR Cycle 8 Revision 2 Page 9 of 19 COLR for Watts Bar Unit 1, Cycle 8 1.50 1.40 1.30 1.20 1.10 I I i di i I I i i I ! i I II I i i ! I I I I i I l I l I I i I I I I i I i I i I i i i I I i i i I I i I I I I I I I I I I I I I I I I I I I I I I I I i I f i I4 I I I i I I I I i .I i ; i i i i i i i I i I I ' 1 1 1 1 1 1 ! I l I N IiI I i i I I I 4-l i I I iI i i I I I I i; i- i- i- i --I --i -i I --I I 1 l l..1 ..!--i -I ! i i l -4 i l ! ! ! ! l Ii l i ! 1 1 1 i i i i i I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I; I I 11 I I I I I i I i --,I.. ...ý ý 1 1 Height Max.(fee W(z)0.0000 1.0000 0.2000 1.0000 0.4000 1.0000 0.6000 1.0000 0.8000 1.0000 1.0000 1.0000 1.2000 1.4115 1.4000 1.3922 1.6000 1.3700 1.8000 1.3455 2.0000 1.3196 2.2000 1.2928 2.4000 1.2655 2.6000 1.2381 2.8000 1.2095 3.0000 1.1882 3.2000 1.1766 3.4000 1.1706 3.6000 1.1680 3.8000 1.1658 4.0000 1.1630 4.2000 1.1597 4.4000 1.1559 4.6000 1.1515 4.8000 1.1466 5.0000 1.1413 5.2000 1.1348 5.4000 1.1282 5.6000 1.1293 5.8000 1.1380 6.0000 1.1486 6.2000 1.1572 6.4000 1.1650 6.6000 1.1715 6.8000 1.1767 7.0000 1.1804 7.2000 1.1828 7.4000 1.1845 7.6000 1.1849 7.8000 1.1836 8.0000 1.1806 8.2000 1.1758 8.4000 1.1691 8.6000 1.1603 8.8000 1.1515 9.0000 1.1492 9.2000 1.1530 9.4000 1.1534 9.6000 1.1553 9.8000 1.1576 10.0000 1.1591 10.2000 1.1614 10.4000 1.1669 10.6000 1.1723 10.8000 1.1757 11.0000 1.0000 11.2000 1.0000 11.4000 1.0000 11.6000 1.0000 11.8000 1.0000 12.0000 1.0000: i, i, " i i i I I K I I [ I I i i i I i i i I i i i l I I I I I I I I I I I I I I I I I I I I I I I Li -i-0i- M -m__ i ia 0 i I--2 i- _ :Liiiiiiiii M M 0 t Lu ý = 1i i i i ii 1 !I i i i i i i iii i i 1...I .I I I.. .....1.00 1. i1. i.1T I1 1 1 1 1 1 l 1 1 1i i i MIM I 1I l ll11, 0 BOTTOM 2 3 4 5 6 7 8 CORE HEIGHT (FEET)9 10 11 12 TOP Figure 5 RAOC Summary of Max W(z) at 2000 MWD/MTU with HFP AFD Band of -12/+6 %(Top and Bottom 10% Excluded)Unit 1 WATTS BAR Cycle 8 Revision 2 Page 10 of 19 COLR for Watts Bar Unit 1, Cycle 8 1.50 1.40 1.30 1.20 1.10 I i ; ! i ! ! ! I i ----I----- ! i I ! I I i I I ; i I I I i I I I i i I I ~i~~ I I I i i I I i ! i i i i i ! i! i ! i i i i i i I I I i I I ; i i i i i I III II I III I 1111111111111 I I I i A ! ! i ! i i ! I I I I I I I I I I ! i I I ! ! i I I I ! i i! I...I .I I ý .I I I ....i ! i i i i i ý i ! i i ! i ! i ! ! i i i i i i i i i i ...1 1i ý11 11 11 1 1 1 ,i11 1 i1 1 1 1 11111 1111 1CCI I-, 1 4-1 Height Max.(feet W(z)0.0000 1.0000 0.2000 1.0000 0.4000 1.0000 0.6000 1.0000 0.8000 1.0000 1.0000 1.0000 1.2000 1.3382 1.4000 1.3221 1.6000 1.3031 1.8000 1.2823 2.0000 1.2600 2.2000 1.2376 2.4000 1.2168 2.6000 1.1980 2.8000 1.1796 3.0000 1.1608 3.2000 1.1470 3.4000 1.1427 3.6000 1.1417 3.8000 1.1407 4.0000 1.1393 4.2000 1.1376 4.4000 1.1355 4.6000 1.1331 4.8000 1.1301 5.0000 1.1268 5.2000 1.1228 5.4000 1.1217 5.6000 1.1325 5.8000 1.1446 6.0000 1.1545 6.2000 1.1639 6.4000 1.1720 6.6000 1.1788 6.8000 1.1843 7.0000 1.1882 7.2000 1.1908 7.4000 1.1931 7.6000 1.1936 7.8000 1.1923 8.0000 1.1892 8.2000 1.1842 8.4000 1.1773 8.6000 1.1685 8.8000 1.1574 9.0000 1.1525 9.2000 1.1540 9.4000 1.1570 9.6000 1.1641 9.8000 1.1719 10.0000 1.1781 10.2000 1.1832 10.4000 1.1866 10.6000 1.1904 10.8000 1.1925 11.0000 1.0000 11.2000 1.0000 11.4000 1.0000 11.6000 1.0000 11.8000 1.0000 12.0000 1.0000.CCIICC;;

C~ 11111111 I 1111CC IC 111CC CI-i-----I-----I-----I-----I-----I-----I-----I-----I-----I-----I-----I i l l 1 1 I! ! I i i h ,i l' !, ', i i ! i, ', ; ' !, i, : ." ', !, 1 i .', ', i i ;1 C i I I I I I IICICCCICCII, III I1IIICC IC, ICC.ICIICIIICCII

CICCCIC i C C i iI i C C C C i ! I I IC I II I ; C I i !I ; II i C i I I I II i i I I ; C I I I C I I I I I I I I I I C C C I I I I C I I I I I C I-I------I-----I-----I C C C I C C C I C I C I C C I I 1.00 i .1 1 1 1i1ii i i i i i i 1 i 1i1 1i i i1 1 M !i i!i1i i1i i ii11 1 iI i 0 BOTTOM 1 2 3 4 5 6 7 8 CORE HEIGHT (FEET)9 10 11 12 TOP Figure 6 RAOC Summary of Max W(z) at 4000 MWD/MTU with HFP AFD Band of -12/+6 %(Top and Bottom 10% Excluded)Unit 1 WATTS BAR Cycle 8 Revision 2 Page 11 of 19 COLR for Watts Bar Unit 1, Cycle 8 Height Max.(feet) W(z)0.0000 1.0000 1.50 1 1 0.2000 1.0000 I 0.6000 1.0000 I Y0.8000 1.0000 1.0000 1.0000 1.2000 1.2427 1.4000 1.2341 1.6000 1.2233 1.8000 1.2113 2.0000 1.1986 4 -2.2000 1.1855 1.402.4000 1.1721 2.6000 1.1585 2.8000 1.1444 3.0000 1.1329 3.2000 1.1290 3.4000 1.1303 3.6000 1.1313 3.8000 1.1319 4.0000 1.1321 4.2000 1.1342 1.30 4.4000 1.1399 4.6000 1.1446 4.8000 1.1485 5.0000 1.1511 5.2000 1.1541 5.4000 1.1621----5.6000 1.1780 5.8000 1.1937-6.0000 1.2072 6.2000 1.2194 6.4000 1.2298 1.20 6.6000 1.2384.1A 1 1.2449 7.0000 1.2497 7.2000 1.2530-I 7.4000 1.2549 i !H 7.6000 1.2544 7.8000 1.2516 8.0000 1.2463 8.2000 1.2387 8.4000 1.2287 8.6000 1.2165 1.10 8.8000 1.2015 9.0000 1.1858 9.2000 1.1741 9.4000 1.1723..9.6000 1.1762 9.8000 1.1817 10.0000 1.1852-----10.2000 1.1879 10.4000 1.1901 10.6000 1.1927 1. 0 10.8000 1.2017 1 .0 0 1 .1 ., ý I- --1 1 .0 0 0 0 1 .0 0 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 11.2000 1.0000 BOTTOM TOP 11.4000 1.0000 CORE HEIGHT (FEET) 11.6000 1.0000 11.8000 1.0000 12.0000 1.0000 Figure 7 RAOC Summary of Max W(z) at 10000 MWD/MTU with HFP AFD Band of -12/+6 %(Top and Bottom 10% Excluded)Unit I Cycle 8 WATTS BAR Page 12 of 19 Revision 2 COLR for Watts Bar Unit 1, Cycle 8 1.50 III~~~ 1111 11111 I 1111 1 11111 1 F77 1117 7 111 t- r 11111111!111111 11 1 1 11 1 1 111 1 111 I 1n11 1 1 1 ! ! ! ! ! i !I I I I I I I I I 1.40 1.30 1.20 I I I I I I I I I I I I I I I I I I I I I lt
  • I, 1 1. ~Iit~~1, tit! 1 1 iti i5 i. .............I. ..I.! IH.. .i ....i .I I .I 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 1 1 1 1 -i i i i i I 1............ ....... ..............Height Max.(feet W(z)0.0000 1.0000 0.2000 1.0000 0.4000 1.0000 0.6000 1.0000 0.8000 1.0000 1.0000 1.0000 1.2000 1.2477 1.4000 1.2382 1.6000 1.2266 1.8000 1.2136 2.0000 1.2001 2.2000 1.1862 2.4000 1.1719 2.6000 1.1573 2.8000 1.1435 3.0000 1.1366 3.2000 1.1364 3.4000 1.1377 3.6000 1.1409 3.8000 1.1467 4.0000 1.1528 4.2000 1.1578 4.4000 1.1620 4.6000 1.1649 4.8000 1.1689 5.0000 1.1721 5.2000 1.1791 5.4000 1.1953 5.6000 1.2093 5.8000 1.2211 6.0000 1.2314 6.2000 1.2397 6.4000 1.2461 6.6000 1.2505 6.8000 1.2526 7.0000 1.2534 7.2000 1.2532 7.4000 1.2507 7.6000 1.2459 7.8000 1.2388 8.0000 1.2295 8.2000 1.2180 8.4000 1.2044 8.6000 1.1880 8.8000 1.1815 9.0000 1.1803 9.2000 1.1754 9.4000 1.1732 9.6000 1.1717 9.8000 1.1673 10.0000 1.1645 10.2000 1.1706 10.4000 1.1839 10.6000 1.1953 10.8000 1.2076 11.0000 1.0000 12 11.2000 1.0000 TOP 11.4000 1.0000 11.6000 1.0000 11.8000 1.0000 12.0000 1.0000 S1 11 1 1 M I ! J ! 1 1 lfA! Ill 1 1 M I.I I I .i ! i ! 4 1 AIN' i 1 i i i 11 i i ij i i i i ! i F i i I I 1 4--q-.--------I--I-.I--I--------------

i i i ! 11 i i i 11 i ! r- i i .in, i i ; ý ; 11 i i i i i i i I ..................I I I I I I I I I I I I I I I I-I-----I------I-----I I I I I I I I I I 1.10 1.00 = i iIJ 1 1 =0 BOTTOM 2 3 4 5 6 7 8 9 10 11 CORE HEIGHT (FEET)Figure 8 RAOC Summary of Max W(z) at 14000 MWD/MTU with HFP AFD Band of -12/+6 %(Top and Bottom 10% Excluded)Unit 1 WATTS BAR Cycle 8 Revision 2 Page 13 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table A.1 FQw(Z) Penalty Factor Core Burnup (MWD/MTU)All burnups FQ w(Z)Penalty Factor 1.0200 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 8 Revision 2 Page 14 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Overlap Counter (steps)0 0 2 2 4 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 20 20 22 22 24 24 26 26 28 28 30 30 32 32 34 34 36 36 38 38 40 40 42 42 44 44 46 46 48 48 50 50 52 52 54 54 56 56 58 58 60 60 62 62 64 64 66 66 68 68 70 70 Band A Bank B Bank C Bank D Bank Overlap Counter (steps)72 72 74 74 76 76 78 78 80 80 82 82 84 84 86 86 88 88 90 90 92 92 94 94 96 96 98 98 100 100 102 102 104 104 106 106 108 108 110 110 112 112 114 114 116 116 118 118 120 120 122 122 124 124 126 126 128 128 0 130 130 2 132 132 4 134 134 6 136 136 8 138 138 10 140 140 12 142 142 14 Unit 1 WATTS BAR Cycle 8 Revision 2 Page 15 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Overlap Counter (steps)144 144 16 146 146 181 148 1148 20 150 150 22 152 152 24 154 154 26 156 156 28 158 158 30 160 160 32 162 162 34 164 164 36 166 166 38 168 168 40 170 170 42 172 172 44 174 174 46 176 176 48 178 178 50 180 180 52 182 182 54 184 184 56 186 186 58 188 188 60 190 190 62 192 192 64 194 194 66 196 196 68 198 198 70 200 200 72 202 202 74 204 204 76 206 206 78 208 208 80 210 210 82 212 212 84 214 214 86 216 216 88 218 218 90 Band A Bank B Bank C Bank D Bank Overlap Counter (steps)220 220 192 222 222 94 224 224 96 226 226 98 228 228 100 230 230 102 232 232 104 234 106 236 108 238 110 240 112 242 114 244 116 246 118 248 120 250 122 252 124 254 126 256 128 0 258 130 2 260 132 4 262 134 6 264 136 8 266 138 10 268 140 12 270 142 14 272 144 16 274 146 18 276 148 20 278 150 22 280 152 24 282 154 26 284 156 28 286 158 30 288 160 32 290 162 34 292 164 36 294 166 38 Unit 1 WATTS BAR Cycle 8 Revision 2 Page 16 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Overlap Counter (steps)296 168 40 298 170 42 300 172 44 302 1174 46 1 304 176 48 306 178 50 308 180 52 310 182 54 312 184 56 314 186 58 316 188 60 318 190 62 320 192 64 322 194 66 324 196 68 326 198 70 328 200 72 330 202 74 332 204 76 334 206 78 336 208 80 338 210 82 340 212 84 342 214 86 344 216 88 346 218 90 348 220 92 350 222 94 352 224 96 354 226 98 356 228 100 358 230 102 360 232 104 362 106 364 108 366 110 368 112 Band A Bank B Bank C Bank D Bank Overlap Counter (steps)370 114 372 116 374 118 376 120 378 122 380 124 382 126 384 128 0 386 130 2 388 132 4 390 134 6 392 136 8 394 138 10 396 140 12 398 142 14 400 144 16 402 146 18 404 148 20 406 150 22 408 152 24 410 154 26 412 156 28 414 158 30 416 160 32 418 162 34 420 164 36 422 166 38 424 168 40 426 170 42 428 172 44 430 174 46 432 176 48 434 178 50 436 180 52 438 182 54 440 184 56 442 186 58 Unit 1 WATTS BAR Cycle 8 Revision 2 Page 17 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Overlap Counter (steps)444 188 60 446 1190 62 448 192 64 450 194 66 452 196 68 454 198 70 456 200 72 458 202 74 460 204 76 462 206 78 464 208 80 466 210 82 468 212 84 470 214 86 472 216 88 474 218 90 476 220 92 478 222 94 480 224 96 482 226 98 484 228 100 486 230 102 488 232 104 490 106 492 108 494 110 496 112 498 114 500 116 502 118 504 120 506 122 508 124 510 126 512 128 514 130 516 132 Band A Bank B Bank C Bank D Bank Overlap Counter (steps)518 134 520 136 522 138 524 140 526 142 528 144 530 146 532 148 534 150 536 152 538 154 540 156 542 158 544 160 546 162 548 164 550 166 552 168 554 170 556 172 558 174 560 176 562 178 564 180 566 182 568 184 570 186 572 188 574 190 576 192 578 194 580 196 582 198 584 200 586 202 588 204 590 206 Unit 1 WATTS BARPae1of9 Cycle Revision 8 2 Page 18 of 19 COLR for Watts Bar Unit 1, Cycle 8 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Overlap Counter (steps)592 208 594 210 596 212 598 214 600 216 602 218 604 220 606 222 608 224 610 226 612 228 614 230 616 232 This information is provided in 2 step increments.

One step increments can be derived by interpolation.

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.

The Table indicates a maximum step of 232 to be consistent with 2 step increments.

Unit 1 WATTS BAR Cycle 8 Revision 2 Page 19 of 19

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