ML062350165

Core Operating Limits Report (COLR) for Cycle 7, Revision 6

ML062350165
Person / Time
Site:	Watts Bar
Issue date:	08/17/2006
From:	Pace P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML062350165 (21)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 AUG 1.7 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 7, REVISION 6 The purpose of this letter is to provide Revision 6 of the Cycle 7 COLR in accordance with WBN Technical Specification 5.9.5.d. Revision 6 revises the axial flux difference (AFD) limit and the W(z) values. This revision was effective as of August 10, 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, P. L. Pace Manager, Site Licensing and Industry Affairs

Enclosure:

Watts Bar Nuclear Plant Unit 1, Cycle 7 Core Operating Limits Report, Revision 6 cc: See Page 2 onrcycd pa Printed

U.S. Nuclear Regulatory Commission Page 2 AUG !17 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 7 Core Operating Limits Report, Revision 6

COLR for Watta Bar Unit 1, Cycle 7 QA Record L36 060809 802 WATTS BAR NUCLEAR PLANT, UNIT 1, CYCLE 7 CORE OPERATING LIMITS REPORT Revision 6 August 2006 Prepared by:-

Nuclear Fuel Design Date

'Nuclear Fuel design Date Reviewed by:/*S Manager, Nucler/ I esign Date Reactor Engineering Supenor Date Approved by:

PORC Chairman 7 Date Plant Manager ( Date Date of PORC PORC Meeting Affected Revision Approval Number Pages Reason for Revision 0 3111/05 4073 All Initial issue 1 3/18/05 4075- All Revised to remove cycle 7 restriction to mode 6 2 5/31/05 4089 1,9-12 Revised maximum W(z) values 3 9/19/05 4107 1, 9- 12 Revised maximum W(z) values 4 3/13/06 4127 1,10-12 Revised maximum W(z) values 5 6/28/06 4144 1,4,8,12 Revised AFD Limit and W(z)

I values 6 1, 8,12 Revised AFD Limit and W(z) values Unit 1 Cycle 7 WATTS BAR Page I of 18 Revision 6

COLR for Watts Bar Unit 1, Cycle 7 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for Watts Bar Unit I Cycle 7 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 (Pal')!

3.2.3 Axial Flux Difference (AFD) 3.5.1 Accumulators 3.5.4 Refueling Water Storage Tank (RWST) 3.9.1 Boron Concentration Z.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 7 WATTS BAR Page 2 of 18 Revision I v

COLR for Watts Bar Unit 1, Cycle 7 2.1 MODERATOR TEMPERATURE COEFFICIENT - MTC (LCO 3.1.4) 2.1.1 The MTC limits are:

The BOLJAR1O/H-ZP - MTC shall be less positive than or equal to 0 Ak/k/*F (upper limit). With the measured BOLJARO/HZP - MTC more positive than

-0.B0 x 10- 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/ 0F (upper limit) for all times In core life.

The EOIJARO/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 104 Ak/k/PF.

2.1.3 The 60 ppm surveillance limit Is:

The measured 60 ppm /ARO/RTP-MTC should be less negative than or equal to 0'k/kIF.

-4.28 x 10' 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 shall be limited in physical insertion as shown in Figure 1.

2.3.2 Table 1 shows the control rod overlap positions.

Unit I Cycle 7 WATTS BAR Page 3 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 2.4 HEAT FLUX HOT CHANNEL FACTOR - VQ(Z) (LCO 3.2.1)

F(Z) !; [CFQ,/ P* K(Z) for P>0.5 Fo(Z) S [CFQI 0.5]

• K(Z) for P 5 0.5 Where P %-Thermal Power/Rated Tharmal Power 2.4.1 CFQ-= 2.50 2.4.2 K(Z) is provided in Figure 2.

2.4.3 Fe(Z) = FoQ(Z)* 1.01s where: F01 (ZT)is the measured valuc of F0(Z) obtaincdior incote flux map msults and 1.0815 Is a factor that accounts for fuel manufacwri.g tolerances and flux map measurtement uncertainty.

2.4.4 FcW(Z) - F(Z)

• w(Z) where: W(Z) values are provided in Figures 4 through 7, only use W(7) values provided in Figure 7 for bwuups greater than 16,000 MWD/MTU. The Figures providc sufficicni inrotmation to determine W(Z) venus core height for all cycle burnups.

2.4.5 Fow(Z) Penalty Factor The FJ4 w(Z) penalty factor is providcd in Table A. 1.

Unit I Cy^1c 7 WATfS BAR Page 4 of 18 Revison/5"

ý/O

COLR for Watts Bar Unit 1, Cycle 7 2.5 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR - Fan (LCO 3.2.2)

FaN < Fain I + PF (-P))

I where P = Thermal Power / Rated Thermal Power Famh = 1.65 for RFA-2 fuel, and FA = 1.62 for VANTAGE+IPERFORMANCE+ fuel PF = 0.3 2.6 AXIAL FLUX DIFFERENCE - AFD (LCO 3.2.3) 2.6.1 The AFD itmits for Cycle 7 are provided in Figt re 3.

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

2.8 ACCUMULATORS (LCO 3.5.1) 2.8.1 There are 240 tritium producing burnable absorber rods (rPBARs) in the reactor core for Cycle 7.

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 7.

Unit I Cycle 7 WATTS BAR Page lw 5 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 250 InImlI nIT 231 (0.074,231) 1 (0.632,231) 225 11111~~~~ (0.506, 225) 'H IAI I ffJ~~~iIiii~

i !i i (0M8,25

.11111111-11zl 11: Jillvr~i 111-1111 II 200 1==1 1oil !!=7=11 flII(1.0.II1Ein 1111111 175 i 11111111111 i iii 150 MM iiiii -_,6 i

iiiii ...................I 125 I Nli 1112-1 iii 0 ... . . . . . . . . . . . .

F-  : i ' L.--

0 0I  !! 3=

0. 100 Se F;j (0 6) 1 0

0 75 11 1 !M 0

I;:: :1.............................

50 S--&

25 1111 I III 0 I-LA--L -FA 0 0.20 0.40 0.60 0.80 1.00 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 I Cycle 7 WATTS BAR Page 6 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 1.2 .. ...... ... .-

1.1 1.0 . . . . . . - - -

0.9 0.8 10 0.7 0.6 - C- H-ld.b0 is 0.000 1.000 6.000 1.000 0

LI 12.000 0.9256 0.4 0.3 ----

0.2 -...

0.1 0

0 2 4 6 8 10 Core Height (feet)

Figure Z K(Z) - Normalized F,(Z) as a Function of Core Height I

Unit 1 Cycle 7 WATTS BAR Page 7 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 120

I ,

110,  : II

. L... . . ...

.1 (-8. 100) I--

I." .' "*'

(10, 100 . . .

100

r. . - -- I - -

90  !........4 ..... Acceptable Operation 80 Unaeptable1 ~ ~etable U

0

. L . ..~ .. .... . Oeration 70 w

60 U

(U 50 - ( ,0 (24. 50) a 40

... .. .L . . .

30 II 20 10 I

0

-50 -40 -30 -20 -10 0 10 20 30 40 50 Flux Difference (&l) %

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

Unit 1 Cycle 7 WATTS BAR Page 8 of 18 Revision/4

-trvf

COLR for Watts Bar Unit 1, Cycle 7 Hasht (bet) WtI) 0.0000 1.0000 0.2000 1,0000

.6

.40 1.0000 0.4000 1.0000 0.6000 1.0000

---

0.8000 1.0000 1.0000 1.0000 2.2512 2.2000 1.4000 1.2321 1.6000 1.2167 2.8000 1.1931 L 2.0000 3.1793 12000 1.1606 2.4000 1.1410 1.1210 2.5000 1.1104 3.0000 1.1062 3.2000 1019 3.4000 1.1008 4 --- ---- 3.9000 1.0998 8.8000 1.1001 4.0000 1.1030 4.2000 1.1088 4.4000 1.2132 1H 4.6000 1.1173

.20 ]UL111-- 4.8O00 1.1206 111F I 0.0000 1.1251 6.2000 1.2549 5.4000 1.1603 3.60000 1.1648 0.8000 1.1804 O0000 1.1972 6.2.000 1.2185 I A LLUL 6.4000 1.2283 6.6O000 1.2416 1.2531 7.0000 1.262"/

7.2000 1.2708 11 11 111 11 1111 111 11 A 111 11 111 1 7.4000 1.27O8 7.6000 1.276a 7.O000

.. Is II III 8.0000 1.2765 8P.200 1.2714 12,833 ILLI M.216 IT IMIA 8.8000 12402 JJ-U I I I i 9,0000 9,2000 9.4000 1.2404 a0rt* a. a 3 4 3 ' 7 a 1.0 11 . 2 9.6000 9,8000 1.2848 CORE HIZGHT (FEET) 1o.oooo 1.23*

10.2000 1.2381 10.4000 1.2446 10.6000 1.2503 10.8000 1.2541 Figure 4 11.0000 3.0000 11.2000 3.0000 RAOC Summary of Max W(z) at 150 MWDIMTU 11.4000 2.0000 with HFP AFD Band of -12/+6 % 11.0000 2.0000 11.2000 1,0000 (Top and Bottom 10% Excluded) 12..0000 1.0000 Unit 1 Cycle 7 WATIS BAR Page 9 of 18 Revision 3 1

COLR for Watts Bar Unit 1, Cycle 7 Helghtft) Max W(z) 0.0000 1.0000 0.2MOO 1.0000

,L. sU 0.4000 I'OODO 0.6*00 0.800O 1.0000 tEIttt 11 11111113 1.0000 1200D 1.000 1.1439 1.4000 1.1319 1.6000 1.1182 I 1.8000 1.1033 IF I I I I I I I I I I I I I I I I I 1 9-0000 1.008" 1.0722 1.40 *1* IIE*IuI*I~ I 2.4000 1.0679 18000 umr 1 f 1 1-JJ-U I 1 1 1 1 1 1-1 1 1 2.8000 3.0000 1.0425 1.0331 1.=G9 1.0304

.... ... --------------------- I -

&40W0 3.8000 1.0344 1.0387 18S000 I I 111 11TI I I I I I I I I I-I I 113 4.0000 1.OSW 4.2000 1.07V"

,, 20*D I 4.4000 N

III 11 111 III 11114[ilIII 1 4.8000 5.4000 1.1001 1.12SO k.. 5*4000

..8000 1.1463 1.,60" 8.0000 1.1664

&2000 1.2104 3: ------------------- 31 6.40W 8.8000 1.2475 iI H H !H i I I I I I 1 11 1 1 1 1 1 11 111] 68A000 1.2040 7.0000 12791 I -"W 7.4000 7.401* 1X61 7.600D 1.3168 ii I1I I111111 1 i H! ii 1.10

!-H:: 7.8000 6.0000 6.2000 1.3241 1.3291 8.4300 1.3316 l 5.9000

. ... ..... . . . .. . . . . . . . . .. . . . . . 1.3207

. .. . 1.320 1111#N 11 1 ! I lm l 11 1 1 1 11 11 1 -1.284 9.0000

,- 92000 1.3W0 9.4000 1..351B 9.60o0 1-63 1 II~lI 9.8*0 I*3775 1.00

~4~+H~4 10.0o000 10.2000 10.4o000 13600 1.4076 11 1 5 1.

1 13 1. IM 1 1 I 10.0000 1.421 5

.1 2 1 1 11-11 3 6 7 U 1.4340 j

poem" 10

.LU .L. o0.8000 1.4441 CORE IE IGHT (FEET) 11.0000 11.2000 1.W000 11.4000 1.0000 1,0000 11.8000 tom00 11.8000 It.0000 1.0000 Figure 5 1.0=0 RAOC Summary of Max W(z) at 3000 MWDIMTU with HFP AFD Band of -12/+6 %

(Top and Bottom 10% Excluded)

Unit 1 Cycle 7 WATTS BAR Page 10 of 18 Ravision 4 i

I

COLR for Watts Bar Unit 1, Cycle 7 Holght(ft) Max W(z) o.00Oo 11M000 1 0.2000 1.0000 1.50 if fill, 1113=13= = IfTij 0.4000 1.0000 0.0000 1.0000 ni .:I: . ~..

0.6000 1.oooo 1.0000 10000 11111111111 !!! 11! 11 !!!! 111 1.2000 1.1684 1.4000 1.1576 1.80=0 1.1467 Lirn I I I I 1 111 1 111111 1111 1 11111 11 1 III[ It-L.UJIL111 11111 1_111 I JIM 1.8000 2.0000 1.1349 1.1240 1.40 1 ! 1111 1 11 111 111111 111 11 1 111171711 11 1 111 1 1 111 2000 2.4000 2.6000 1.1125 1.1009 1.0IM1 2.1000 1.0786 LJ I I1 1-11 3.0000 3.2000 I.071G 1.0736 fill Jill0 14000 1.0756 1.30

'Illi 11JL11111 IIf 111I 11111 itif111114.11111 3.0000 ISM00 4.0000 4.2000 1.0773 1,0792 1.0m29 1.0661 111 111111 1111ft17111111 1111111 1111111 111 1= 4.40m0 4.6000 1.0047 1.1005

-I- 4.0000 1.1071

1

.4L mr  ;:7,7-z 7--;.j j j j j i

, L-n --= - . ----

5.0000 5.2000

&4000 1.113t 1,1216 I.1300 5.OO00 1,1572 6.9000 1.1743 1.20 M1i :1 3M 13 8.MO00 6.2000 1,1890 1.2042 6.4000 1.2163 6.W000 1.2269 6.9000 1.2356 11114.1111 !!! !!! il I 7.0000 7.2000 1.2425 1.2486 7.4000 1.2632 7.0000 1.2w9 7.6000 12573 r:z 111 I-Tt 8.0000 892000 1.2558 12627 1.10 1.2480 I I I11111 1M.1 1111 112M II II I IIII IIIIII IJ!1111111 1111 &.4000 8.0O00 1.2488

• ff 8.0000 1.2478 9.OOO 1.2611 I I-i- 11ji-111 111111 lit M3 9.2000 9.4000 1.256N 1.234 9.6000 1.2686 D.000 10.2670

-A-&. 10.0000 i.=087 10.2000 1.2677 s1o. 10.4000 1.2669

-.. --A I F I ram7 a . * ) I 10.6000 1.2aw 10.000 1.285 CORE EEIGRT (FEET) 11.0000 1.0000 11,2000 1,o0000 11.4000 1.0000 11.4000 1.0000 11.J000 1,0o000 12.0000 t.omoo Figure 6 RAOC Summary of Max W(z) at 10000 MWDJMTU with HFP AFO Band of -12/+6 %

(Top and Bottom 10% Excluded)

Unit 1 Cycle 7 WATTS BAR Page 11 of 18 Revision 4

COLR for Watts Bar Unit 1, Cycle 7 Height Max.

(feet) W(z) 0.0000 1.0000 0.2000 1.0000 0.4000 1.0000 0.6000 1.0000 1.501 0.8000 1.0000 1.0000 1.0000

........ I ..... - ... - ...... 1 1.2000 1.3795 1.4000 1.3678 1t~ .... I 1.6000 1.3543 1.3395 ltWzjz 1.8000 2.0000 1.3232 2.2000 1.3069 1.4I HIl Hil !11 Ill111111MMi 1111111 111111 2.4000 2.6000 1.2876 1.2675 2.8000 1.2466 3.0000 1.2248 3.2000 1.2105 3.4000 1.2053 I 3.6000 1.2007 3.8000 1.1965 4.0000 3.1916 4.2000 1.1856 1.3011 4.4000 1.1790 4.6000 1.1714 rl 111111111 M 111111111111 111111 4.8000 1.1639 rwtiiiiii ............I ý . . . . . . . .

5.0000 5.2000 1.1586 1.1552 5.4000 1.1537 5.6000 1.1540 5.8000 1.1552 Ifl...-4--.--4-4 6.0000 1.1558 6.2000 1.1542 6.4000 1.1523 6.6000 1.1491 iir E

I 6.8000 1.1441 7.0000 1.1392 7.2000 1.1331 7.4000 1.1279 7.6000 1.1215 1.1137 1.16 1--11itt 7.8000 8.0000 1.1060

. . . . 0, i 8.2000 1.0961 8.4000 1.0866 8.6000 1.0780 8.8000 1.0781 9.0000 1.0827 9.2000 1.0839

-1 1 1 1 L J.

- 11Ud 3 4 5 1 8 9 10 lit=Iht 11 9.4000 9.6000 1.0838 1.0877

2. 2 9.8000 1.0983 CORE HEIGHT (FEET) 10.0000* 1.1183 10.2000 1.1369 10.4000 1.1575

.10.6000 1.1782 10.8000 1.1957.

11.0000 1.0000 Figure 7 11.2000 1.0000.

RAOC Summary of Max W(z) at 16000 MWD/MTU 11.4000 1.0000 11.6000 1.0000 with HFP AFD Band of -8/+10 % 11.8000 1.0000 12.0000 1.0000 (Top and Bottom 10% Excluded)

Unit 1 Cycle 7 WATTS BAR Page 12 of 18 Revision 6 I

COLR for Watts Bar Unit 1, Cycle. 7 Table A.1.

Few(Z) Penalty Factor Core FQWCL)

Burnup Penalty "MWDMFL Factor All bunups 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 FoWCZ) is expected to Increase per 31 Effective Full Power Days (EFPD) starting from the burnup at which the FQw(Z) was determined.

Unit 1 Cycle 7 WATTS BAR Page 13 of i8 Revision 1

COLR for Watts Bar Unit 1, Cycle 7 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Band ABank BBank CBank DBank Overlap Overlap Counter Counter (steps) (steps) _ _

o 0 72 72 2 2 74 74 4 4 76 76 6 6 78 78 so so 8 8 10 10 ___ ___ 82 82 12 12 84 84 14 14 86 86 16 16 88 88 18 18 90 _o 20 20 92 92 22 22 94 94 24 24 96 96 26 26 98 98 28 28 100 100 30 30 102 102 32 32 104 104 34 34 106 106 36 36 108 108 38 38 110 110 40 40 112 112 42 42 114 114 44 44 116 116 46 46 118 118 48 48 120 120 50 50 122 122 52 52 124 124 54 54 126 126 56 56 128 128 0 58 58 130 130 2 60 60 132 132 4 62 62 134 134 6 64 64 136 136 8 66 66 138 138 10 68 68 140 140 12 70 70 142 142 14 Unit 1 Cycle 7 WATTS BAR Page 14 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 Table 1: Control Rod Overlap Band ABank B Bank CBank DBank Band A Bank B Ba*k C Bank D Bank Overlap Overlap Counter Counter (3teps) (steps) 144 144 16 220 220 92 146 146 18 222 222 94 148 148 20 224 224 96 150 150 22 226 226 98 152 152 24 228 228 100 154 26 230 230 102 "

154 156 156 28 232 232 104 158 158 30 234 106 160 160 32 236 108 162 162 34 238 110 164 164 36 240 112 166 166 38 242 114 168 168 40 244 116 170 170 42 246 118 172 172 44 248 120 174 174 46 250 122 176 176 48 252 124 178 178 50 254 126 180 180 52 256 128 0 182 182 54 259 130 2 184 184 56 260 132 4 186 186 5 . 262 134 6 188 188 60 264 136 8 190 190 62 266 138 10 192 192 64 268 140 12 194 194 66 270 142 14 196 ING 68 272 144 16 198 198 70 274 146 18 200 200 72 276 148 20 20z 202 74 278 150 22 204 204 76 280 152 24 206 206 78 282 154 26 208 208 80 284 156 28 210 210 82 286 158 30 212 212 84 288 160 32 214 214 86 290 162 34 216 216 8 292 164 36 218 218 90 294 166 38 Unit I Cycle 7 WATTS BAR Page 15 of 18 Revision 1

COLR for Watts Bar Unit 1, Cycle 7 Table 1: Control Rod Overlap Band A Bank B Bank C Bank D Bank Band ABank BBank CBank DBank Overlap Overlap Counter Counter (steps) 296 168 40 370 114 298 170 42 372 116 300 172 44 374 118 302 174 46 376 120(

304 176 48 378 122 308 178 50 380 124 308 180 152 38Z 126 310 182 54 384 128 0 31Z 154 56 386 130 2 314 ISO 58 388 132 4 316 188 60 390 134 6 318 190 62 392 136 8 320 192 64 394 138 10 322 194 66 396 140 12 324 196 68 398 3 142 14 326 198 70 400 144 16 328 200 72 402 146 18 330 202 74 404 148 20 332 204 76 406 150 22 334 206 78 408 152 24 336 208 80 410 154 26 338 210 82 412 156 28 340 212 84 414 158 30 342 214 86 416 160 32 344 216 88 418 162 34 346 218 90 420 164 36 348 220 92 422 166 38 350 222 94 424 168 40 352 224 96 426 170 42 354 226 98 428 172 44 356 228 100 430 174 46 358 230 102 432 176 48 360 232 104 434 178 50 362 106 436 180 52 364 108 438 182 54 366 110 440 184 56 368 112 442 186 58 Unit 1 Cycle 7 WATTS BAR Page 16 of 18 Revision I

COLR for Watts Bar Unit 1, Cycle 7 Table 1: Control Rod Overlap Band ABank BBank CBank DBank Band ABank BBank CBank DBank Overlap Overlap Counter Counter (Steps) (steps) 444 188 60 518 134 446 190 62 520 138 448 192 64 522 138 450 194 68 524 140 452 196 68 526 142 454 198 70 528 144 456 200 72 530 146 458 202 74 532 148 460 204 76 534 150 462 206 78 536 152 464 208 80 538 154 466 210 82 540 156 468 212 84 542 158 470 214 86 544 160 472 216 88 546 162 474 218 90 548 164 476 220 92 550 166 478 222 94 552 168 480 224 95 554 170 482 226 98 556 172 484 228 100 558 174 486 230 102 560 176 488 232 104 562 178 400 106 564 .. 10 492 108 566 182 494 110 568 184 496 112 570 186 498 114 572 188 500 116 574 190 502 118 576 192 504 120 578 194 506 122 580 196 508 124 582 198 510 126 584 200 512 128 586 202 514 130 588 204 516 132 590 206 Unit I Cycle 7 WATTS BAR Page 17 of 18 Revision I

4 COLR for Watts Bar Unit 1, Cycle,7 Table 1: Control Rod Overlap Band ABank BBank CBank DBank Overlap Counter (steps) 592 208 594 210 506 212 598 214 600 216 602 218 604 220 606 222 608 224 610 226 612 228 614 230 616 232 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 Cycle 7 WATTS BAR Page 18 of 18 Revision I