NL-11-2044, Cycle 16 Version 2 Core Operating Limits Report

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Cycle 16 Version 2 Core Operating Limits Report
ML112991116
Person / Time
Site: Vogtle Southern Nuclear icon.png
Issue date: 10/26/2011
From: Ajluni M
Southern Nuclear Operating Co
To: Ajluni M
Office of Nuclear Reactor Regulation
References
NL-11-2044
Download: ML112991116 (13)
v • d • e


Text

Mark J. Ajluni. P.E. Southern Nuclear Nuclear Licensing Director Operating Company. Inc.

40 Inverne ss Center Parkway Post Office Box 1295 Bi rmi ngham, Alabama 35201 Tel 205.992.7673 October 26, 2011 Fax 205.992.7885 Docket Nos.: 50-425 SOUTHERN ' \ '

COMPANY U. S. Nuclear Regulatory Commission NL-11-2044 ATTN: Document Control Desk Washington , D. C. 20555-0001 Vogtle Electric Generating Plant - Unit 2 Cycle 16 Version 2 Core Operating Limits Report Ladies and Gentlemen:

In accordance with Technical Specification 5.6.5.d, Southern Nuclear Operating Company submits the enclosed Core Operating Limits Report (COLR) for Vogtle Electric Generating Plant (VEGP) Unit 2 Cycle 16 Version 2. Please note that a new version of the COLR was required due to debris found in two assemblies originally scheduled for use in Cycle 16.

This letter contains no NRC commitments. If there are any questions, please contact Jack Stringfellow at (205) 992-7037.

Respectfully submitted, M. J. Ajluni Nuclear Licensing Director MJA f RMJ flac

Enclosure:

Core Operating Limits Report VEGP Unit 2 Cycle 16 Version 2 cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Chief Nuclear Officer Mr. T. E. Tynan, Vice President - Vogtle Ms. P. M. Marino, Vice President - Engineering RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. D. H. Jaffe, NRR Project Manager - Vogtle Mr. L. M. Cain, Senior Resident Inspector - Vogtle

Vogtle Electric Generating Plant Unit 2 Cycle 16 Core Operating limits Report Enclosure Core Operating limits Report, VEGP Unit 2 Cycle 16, Version 2

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 Cycle 16 redesign has been prepared in accordance with the requirementsofTechnical Specification 5.6.5.

The Technical Requirement affected by this report is listed below:

13.1.1 SHUTDOWN MARGIN - MODES I and 2 The Technical Specifications affected by this report are listed below:

3. \.l SHUTDOWN MARGIN - MODES 3, 4 and 5 3.1.3 Moderator Temperature Coefficient 3.1.5 Shutdown Bank Insertion Limits 3.1.6 Control Bank Insertion Limits 3.2.1 Heat Flux Hot Channel Factor - FQ(Z) 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor - FN ~H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented in the follow ing subsections. These limits have been developed using NRC-approved methodologies including those specified in Technical Specification 5.6.5.

2.1 SHUTDOWN MARGIN - MODES I and 2 (Technical Requirement 13 .1.1) 2.1 . 1 The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent ~klk.

2.2 SHUTDOWN MARGIN - MODES 3, 4 and 5 (Specification 3.1.1) 2.2.1 The SHUTDOWN MARGIN shall be greater than or equal to the limits shown in Figures I and 2.

2.3 Moderator Temperature Coefficient (Specification 3. 1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOLIAROIHZP-MTC shall be less positive than +0.7 x 10-4 ~kJkJoF for power levels up to 70% RTP with a linear ramp to 0 ~kJkJo F at 100% RTP.

The EOLIAROIRTP-MTC shall be less negative than -5.40 x 10-4 ~kJ° F.1 2.3.2 The MTC Surveillance limits are:

The 300 ppmJARO/RTP-MTC should be less negative than or equal to

-4.65 x I 0-4 ~kJ°F. I The 60 ppm/AROIRTP-MTC should be less negative than -5.25 x 10-4 ~k1k;oF.1 where: BOL stands for Beginning of Cycle Life ARO stands for All Rods Out HZP stands for Hot Zero THERMAL POWER EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER I Applicable for full-power T-average of 583.4 to 586.4°F.

Page 2 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 2.4 Shutdown Bank Insertion Limits (Specification 3 .1.5) 2.4.1 The shutdown banks shall be withdrawn to a position greater than or equal to 225 steps.

2.5 Control Bank Insertion Limits (Specification 3.1 .6) 2.5. 1 The control rod banks shall be limited in physical insertion as shown in Figure 3.

2.6 Heat Flux Hot Channel Factor - F Q(Z) (Specification 3.2.1) 2 .6.1 F Q(Z) s +.

F RTP K(Z) for P > 0.5 F RTP FQ(Z)S~O *K(Z) forP~0.5

.5 THERMAL POWER where:

P = RATED THERMAL POWER 2.6.2 F QRTP = 2.50 2.6.3 K(Z) is provided in Figure 4.

F RTP. K(Z) 2.6.4 F Q(Z) S ~. W(Z) for P > 0.5 F RTP. K(Z)

F Q(Z) S 6.5. W(Z) for P ~ 0.5 2.6.5 W(Z) values are provided in Table 2.

2.6.6 The FQ(Z) penalty factors are provided in Table I.

Page 3 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 20 II 2.7 Nuclear Enthalpy Rise Hot Channel Factor - FN 6H (Specification 3.2.2)

N RTP 2.7 . 1 F 5.F * (I+PF6H *(l-P))

t:Jf t:Jf THERMAL POWER where : P RATED THERMAL POWER 2.7.2 1.65 2.7.3 PF M-I = 0.3 2.8 Axial Flux Difference (Specification 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Acceptable Operation Limits are provided in Figure 5.

2.9 Boron Concentration (Specification 3.9. 1) 2.9 . 1 The boron concentration shall be greater than or equal to 1834 ppm . 1 IThis concentration bounds the condition of kerr '5. 0.95 (all rods in less the most reactive rod) and subcriticality (&t rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B 10 depletion .

Page 4 of 11

CORE OPERATfNG LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 Table 1 FQ(Z) PENALTY FACTOR Cycle FQ(Z)

Burnup Penalty (MWD/MTU) Factor 30 1.021 150 1.021 367 1.023 584 1.023 802 1.023 1019 l.02l Notes:

1. The Penalty Factor, to be applied to FQ(Z) in accordance with SR 3.2.1.2, is the maximum factor by which FQ(Z) is expected to increase over a 39 EFPD interval (surveillance interval of 31 EFPD plus the maximum allowable extension not to exceed 25% of the surveillance interval per SR 3.0.2) starting from the burnup at which the FQ(Z) was determined .
2. Linear interpolation is adequate for intermediate cycle burnups.
3. For all cycle burn ups outside the range of the table, a penalty factor of 1.020 shall be used .

Page 5 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 Table 2 RAOC W(Z)

Axial Elevation 150 4000 12000 20000 Point (feet) MWD/MTU MWD/ MTU MWD/MTU MWD/MTU

  • 1 12.00 1.0000 1.0000 1.0000 1.0000
  • 2 11.80 1.0000 1.0000 1.0000 1.0000
  • 3 11.60 1.0000 1.0000 1.0000 1.0000
  • 4 11.40 1.0000 1.0000 1.0000 1.0000
  • 5 11.20 1.0000 1.0000 *1.0000 1.0000 6 11.00 1.3599 1.3782 1.2275 1.2327 7 10.80 1.3449 1.3636 1.2288 1.2239 8 10.60 1.3278 1.3486 1.2353 1.2151 9 10.40 1.3084 1.3337 1.2406 1.2109 10 10.20 1.2964 1.3149 1.2443 1.2147 11 10.00 1.3029 1.2922 1.2467 1.2190 12 9.80 1.3035 1.2770 1.2496 1.2209 13 9.60 1.2955 1.2708 1.2502 1.2217 14 9.40 1.2835 1.2682 1.2482 1.2208 15 9.20 1.2653 1.2632 1.2463 1.2183 16 9.00 1.2477 1.2498 1.2395 1.2178 17 8.80 1.2329 1.2368 1.2312 1.2148 18 8.60 1.2284 1.2288 1.2284 1.2162 19 8.40 1.2321 1.2246 1.2325 1.2285 20 8.20 1.2326 1.2216 1.2363 1.2458 21 8.00 1.2381 1.2157 1.2370 1.2602 22 7.80 1.2426 1.2147 1.2418 1.2713 23 7.60 1.2429 1.2156 1.2479 1.2797 24 7.40 1.2408 1.2124 1.2496 1.2851 25 7.20 1.2360 1.2070 1.2486 1.2876 26 7.00 1.2290 1.1993 1.2448 1.2874 27 6.80 1.2198 1.1899 1.2385 1.2842 28 6.60 1.2093 1.1783 1.2298 1.2798 29 6.40 1.1982 1.1660 1.2191 1.2757 30 6.20 1.1864 1.1559 1.2064 1.2704 31 6.00 1.1730 1.1466 1.1921 1.2638 32 5.80 1.1606 1.1392 1.1768 1.2536 33 5.60 1.1531 1.1344 1.1717 1.2467 34 5.40 1.1528 1.1345 1.1759 1.2458 35 5.20 1.1586 1.1431 1.1785 1.2472 36 5.00 1.1639 . 1.1516 1.1804 1.2461 37 4.80 1.1678 1.1587 1.1825 1.2447 38 4.60 1.1709 1.1652 1.1840 1.2430 39 4.40 1.1730 1.1708 1.1839 1.2386 40 4.20 1.1740 1.1755 1.1823 1.2321 41 4.00 1.1736 1.1793 1.1824 1.2235 42 3.80 1.1740 1.1828 1.1837 1.2129 43 3.60 1.1759 1.1855 1.1841 1.2007 44 3.40 1.1777 1.1874 1.1833 1.1870 45 3.20 1.1799 1.1918 1.1818 1.1749 46 3.00 1.1837 1.2019 1.1797 1.1767 47 2.80 1.1955 1.2176 1.1831 1.1839 48 2.60 1.2138 1.2360 1.1965 1.1891 49 2.40 1.2306 1.2536 1.2078 1.1972 50 220 1.2472 1.2710 1.2191 1.2082 51 2.00 1.2638 1.2881 1.2303 1.2196 52 1.80 1.2800 1.3047 1.2413 1.2308 53 1.60 1.2959 1.3206 1.2522 1.2423 54 1.40 1.3113 1.3358 1.2628 1.2540 55 1.20 1.3261 1.3506 1.2730 1.2656 56 1.00 1.3394 1.3650 1.2822 1.2767
  • 57 0.80 1.0000 1.0000 1.0000 1.0000
  • 58 0.60 1.0000 1.0000 1.0000 1.0000
  • 59 0.40 1.0000 1.0000 1.0000 1.0000
  • 60 0.20 1.0000 1.0000 1.0000 1.0000
  • 61 0.00 1.0000 1.0000 1.0000 1.0000

These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 583.4 to 586.4°F.

Page 6 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING) 5.0 4.0 ACCEPTABLE OPERATING REGION

~

(2 00, .1 P)

~

<:! 3 . 0 V aP V V

V Z

H REQUIRED SHUTDOWN MARGIN V Cl p::

V (1 00, .2 ~) VI"

~ V

~ ./

V 0 2.0 Q

~ V

x: V til V

./

V IUNACCEPTABLE OPERATING REGI ONJ

(~5( , .30 )

1.0 0.0 o 500 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)

Page 7 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE) 5.0 V

(2 00 I ~

V

.9 L

eY V

4.0

)/

V IACCEPTABLE OPERATING REGION I V L

V

~

VV

~

/

l/

<1 3.0 V

0\0 IREQUIRED SHUTDOWN MARGIN I (1 50 I .8 ~)

Z H

~ V Il:

~ V

~

0 2.0 V

~

E-< V

~

z:

til V V UNACCEPTABLE OPERATING REGION I

1. 0

/V

( il6 C I

  • C 0) 0 .0 o 500 1000 1500 2 000 2500 RCS BORON CONCENTRATION (ppm)

Page 8 of 11

CORE OPERATfNG LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 FIGURE 3 ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn*)

220 V 1( .00 22~ I/' 78 . )~ (2 :~ll V V V V 200 BANK B 1/ 1/

V V V V ICI% 1611 V I{ 'l 'l5 , ~bll aJ Po

~ 140 Ul 1/

z 1/

BANK C 1/

0120 H 1/ V E-<

H V V Ul V V V

~ 100 V V 1/ 1/ BANK D 60 1/ 1/

1/ V V V V V C'l5 H) V 40 V 20

( 3 .2ft C ) I.. . .

o 1/

0 10 20 30 40 50 60 70 80 90 1 o POWER (% of Rated Thermal Power)

  • Fully withdrawn shall be the condition where control rods are at a position within the interval ~ 225 and ~ 231 steps withdrawn.

NOTE: The Rod Bank Insertion Limits are based on the control bank withdrawal sequence A, B, C, 0 and a control bank tip-to-tip distance of 115 steps.

Page 9 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTO BER 201 1 FIGURE 4 K(Z) - NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1.4 1.2

~

o E-i U

r;: 1. 0 Cl Z

H

~

I'<l p., O . B FQ = 2 . 50 Q

I'<l CORE t'I H HT. K(Z )

~

0.00 1. 00

00. 6 6.00 1. 00 Z 12.0 . 925

~

0 .4 0 .2 0.0 o 2 4 6 B 10 12 CORE HEIGHT (feet)

Page 10 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 16 REDESIGN OCTOBER 2011 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % OF RATED THERMAL POWER FOR RAOC 120 110

(-15, 100) (+10, 100) 100

/ ~

H Q)

J 90 U ~AC rEP' ABI E I \ UN CC PTl' BLE 0

Po. II \

...-i 1\1 80 j 1\

e Q)

I \

..c:

Eo< 70 II I ArCE PTA LE

\

't:l Q) 1\

I ~

.w 1\1

~ 60

~ I \

0 0\0 50 1/

~

Il:l l (- 30, 50) 1 ( +26, 50)

~ 40 0

Po.

30 20 10 o

-50 -40 -30 -2 0 -1 0 o 10 20 30 40 50 AXIAL FLUX DIFFERENCE (percent ~I)

Page 11 of 11

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