NL-10-0662, Unit 2 Cycle 15 Version 2 Core Operating Limits Report

Unit 2 Cycle 15 Version 2 Core Operating Limits Report

ML100920256
Person / Time
Site:	Vogtle
Issue date:	04/02/2010
From:	Ajluni M Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-10-0662
Download: ML100920256 (17)

Text

Southern Nuclear Operating Company, Inc.

205 5COC SOUTHERN'\'

COMPANY April 2, 2010 Docket Nos.: 50-425 NL-10-0662 U. S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant-Unit 2 Cycle 15 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 15 Version 2. Two fuel assemblies were removed from the reload design based on inspection results.

This version of the COLR was generated to reflect the redesigned core.

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

Respectfully submitted, M. J. Ajluni Manager - Nuclear Licensing MJA IPAH/lac

Enclosure:

Core Operating Limits Report VEGP Unit 2 Cycle 15 Version 2

U. S. Nuclear Regulatory Commission Log: NL-10-0662 Page 2 cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President (w/o enclosure)

Mr. T. E. Tynan, Vice President - Vogtle Ms. P. M. Marino, Vice President - Engineering (w/o enclosure)

RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Mr. R. E. Martin, NRR Project Manager - Vogtle Mr. M. Cain, Senior Resident Inspector - Vogtle Mr. P. Boyle, NRC Project Manager State of Georgia Mr. C. Clark, Commissioner-Department of Natural Resources

Vogtle Electric Generating Plant - Unit 2 Cycle 15 Core Operating Limits Report Enclosure Core Operating Limits Report VEGP Unit 2 Cycle 15, Version 2

Vogtle Electric Generating Plant Unit 2 Core Operating Limits Report Unit 2 Cycle 15 Version 2 March 2010 Revision Insertion Instructions Instructions Active COLR List Replace.

Unit 2 Report Replace.

and Title Page

Vogtle Electric Generating Plant Unit 1 and Unit 2 Active Core Operating Limits Report List March 2010 Unit 1 Cycle 16 Revision 1 October 2009 Unit 2 Cycle 15 Version 2 March 2010

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE 15 CORE OPERATING LIMITS REPORT Version 2 March 2010

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 Cycle 15 Redesign has been prepared in accordance with the requirements of Technical Specification 5.6.5.

The Technical Requirement affected by this report is listed below:

13.1.1 SHUTDOWN MARGIN - MODES 1 and 2 The Technical Specifications affected by this report are listed below:

3.1.1 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 - FNt.H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 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 1 and 2 (Technical Requirement 13.1.1) 2.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent Mlk.

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 1 and 2.

2.3 Moderator Temperature Coefficient (Specification 3.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOL/AROIHZP-MTC shall be less positive than +0.7 x 10-4 ~klkloF for power levels up to 70% RTP with a linear ramp to 0 ~klkloF at 100% RTP.

The EOLIAROIRTP-MTC shall be less negative than -5.50 x 10-4 ~klkl°F.!

2.3.2 The MTC Surveillance limits are:

The 300 ppmlAROIRTP-MTC should be less negative than or equal to

-4.75 x 10-4 MlkloF.!

The 60 ppmlARO/RTP-MTC should be less negative than -5.35 x 10-4 ~klkl°F.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 584.4 to 587.4°F.

Page 2 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 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 - FQ(Z) (Specification 3.2.1) 2.6.1 F Q(Z) ~ +.

F RTP K(Z) for P > 0.5 F RTP F Q(Z) ~ ~.5 . K(Z) for P S 0.5 THERMAL POWER where:

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

RTP FQ *K(Z) 2.6.4 FQ(Z) S p. W(Z) forP> 0.5 RTP FQ *K(Z)

F Q(Z) ~ 0.5. W(Z) for P S 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 1.

Page 3 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 2.7 Nuclear Enthalpy Rise Hot Channel Factor - FN ~H (Specification 3.2.2) 2.7.1 THERMAL POWER where:

P = RATED THERMAL POWER 2.7.2 1.65 2.7.3 PFtlli = 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 1815 ppm. I IThis concentration bounds the condition ofkeff;.S; 0.95 (all rods in less the most reactive rod) and subcriticality (all rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B IO depletion.

Page 4 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 Table 1 FQ(Z) PENALTY FACTOR Cycle FQ(Z)

Bumup I Penalty (MWDIMTU) Factor 30 1.028  !

150 1.028

_ .... I I

367 1.029 584 1.029 801 1.028 1018 1.025 I 1235 1.021 1453 1.020 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 of31 EFPD plus the maximum allowable extension not to exceed 25% of the surveillance interval per SR 3.0.2) start ing from the bumup at which the FQ(Z) was determined.

2. Linear interpolation is adequate for intermediate cycle burnups.

3. For all cycle burnups 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 15 REDESIGN MARCH 2010 Table 2 RAOCW(Z)

Axial Elevation 150 4000 12000 20000 Point (feet) MWDIMTU MWDIMTU MWDIMTU MWDIMTU

• I 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 1l.20 1.0000 1.0000 1.0000 1.0000 6 11.00 1.2758 1.4673 1.3282 1.2021 7 10.80 1.2768 1.4520 1.3174 1.1880 8 10.60 1.2755 1.4338 1.3052 1.1810 9 10.40 1.2706 1.4105 1.2909 1.1787 10 10.20 1.2597 1.3854 1.2744 1.1765 II 10.00 1.2463 1.3577 1.2557 1.1781 12 9.80 1.2389 1.3253 1.2436 1.1805 13 9.60 1.2353 1.2998 1.2400 1.1815 14 9.40 1.2296 1.2829 1.2373 1.1868 15 9.20 1.2208 1.2622 1.2288 1.2011 16 9.00 1.2133 1.2423 1.2204 1.2123 17 8.80 1.2115 1.2291 1.2116 1.2235 18 8.60 1.2143 1.2258 1.2098 1.2335 19 8.40 1.2224 1.2259 1.2155 1.2426 20 8.20 1.2271 1.2244 1.2181 1.2554 21 8.00 1.2341 1.2254 1.2243 1.2647 22 7.80 1.2393 1.2250 1.2292 1.2754 23 7.60 1.2408 1.2212 1.2306 1.2860 24 7.40 1.2398 1.2152 1.2297 1.2921 25 7.20 1.2362 1.2071 1.2263 1.2950 26 7.00 1.2303 1.1971 1.2207 1.2947 27 6.80 1.2224 1.1853 1.2131 1.2914 28 6.60 1.2131 1.l726 1.2035 1.2853 29 6.40 1.2033 1.1605 1.1928 1.2766 30 6.20 1.1929 1.l498 1.1821 1.2656 31 6.00 1.1805 1.1407 1.1696 1.2522 32 5.80 1.1701 1.l332 1.1586 1.2413 33 5.60 Ll605 1.1278 1.1569 1.2356 34 5.40 Ll540 1.1272 1.1646 1.2348 35 5.20 1.1598 1.1338 1.1699 1.2380 36 5.00 1.1659 1.l403 1.1739 1.2400 37 4.80 1.1700 1.1456 1.l770 1.2397 38 4.60 1.1737 1.1503 1.1787 1.2374 39 4.40 1.1762 1.1542 1.1792 1.2329 40 4.20 1.1776 1.1574 1.1785 1.2263 41 4.00 1.1778 1.1592 1.1757 1.2177 42 3.80 U771 1.1623 1.1756 1.2072 43 3.60 1.1753 1.1670 1.1787 \.1955 44 3.40 1.1732 1.1711 1.1804 1.1846 45 3.20 1.1768 1.1752 1.1813 1.1764 46 3.00 1.1861 1.1813 1.1808 1.1703 47 2.80 1.1972 1.1969 1.1840 1.1728 48 2.60 1.2106 1.2205 1.1950 1.1834 49 2.40 1.2288 1.2425 1.2045 1.1932 50 2.20 1.2466 1.2646 1.2141 1.2029 51 2.00 1.2639 1.2866 1.2239 1.2127 52 1.80 1.2810 1.3081 1.2336 1.2227 53 1.60 1.2977 1.3289 1.2433 1.2330 54 1.40 1.3139 1.3487 1.2529 1.2435 55 1.20 1.3293 1.3673 1.2622 1.2541 56 1.00 1.3434 1.3837 1.2707 1.2641

• 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

• Top and Bottom 5 Points Excluded per Teclmical Specification B3.2.1.

These W(Z) values are consistent with Figure 5, and are valid over the HFP Tavg temperature range from 584.4 to 587.4°F.

Page 60fH

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 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 I I I I I I I I I I I 4 . Ol----+----'-----'I,---+---+---I---I---+-+-+---r--+--+-+--+-r--r-r-+---+--+--+--+--+---,--+---f I

ACCEPTABLE OPERATING REGION I I I I IUNACCEPTABLE OPERATING REGION I I

RCS BORON CONCENTRATION (ppm)

Page 7 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE) 5.0 I I I /

~

(2 00, ~ .9 I _.

V "

4.0 I I

i I ",,/

IACCEPTABLE OPERATING REGION I VV

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/

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-<l 3.0 I

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H IREQUIRED SHUTDOWN MARGIN~

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~ V 11.1 I

/ UNACCEPTABLE OPERATING REGION i

1.0 V i

( !l6C, ' . 0) , I ,

I I

...... I I I 0.0 i I I I i I I  !

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

Page 8 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 FIGURE 3 ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn*)

, VI 220 ,I ,  ! (~ .OP6 212f5 I V V 78. i~ IZ :51)1 I I fm I

I I I V I I

• I 200 I I I I BANK B

~ 180 1/ 1/

III H V 1/

g

!:! 160 ~ :61 V V

I( .Ii ( %H#

~

fIl

~

~ 140 mi trft

=mH+t= iW U,l -

- tt+/-t ...

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~ 120 /

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~

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1/

+/-i= I I ,

V V

~tR=F U,l I V I I I I V

~ 100 I I it I

==

~

=1 it BANK D I v~

/ I 60 1 I

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40 V

V

.0% mm  !

i I

ffff= V V

V I I I 20 o

0 10 1=1+

I I(

I I 20

.2. 30 40 50 POWER (% of Rated Ther.mal Power) 60

=F 70 80 90 1 o

• 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, D and a control bank tip-to- distance of 115 steps.

Page 9 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 FIGURE 4 K(Z) - NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1.4 I

1.2 FQ = 2.50 CORE HT. K(Z) 0.00 1. 00 6.00 1. 00 12.0 .925 t'l t;:l 0.4 I

0.2 I

I 0.0 I

• o 2 4 6 8 10 12 CORE HEIGHT (feet)

Page 10 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 2 CYCLE 15 REDESIGN MARCH 2010 FIGURES AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % OF RATED THERMAL POWER FORRAOC 120 i

I i 110

-. ( 15, 100) (+10, OO) 100 i I \

H Q) 90 U ~AC ~Epr ~ABI E I \ UN CCl PTl BLE

~

Il4 II

.-i AS 80 r\

e Q)

I I \

.£:l E-t 70 I

/ ArCE PTAI LE

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'tJ Q)

I rx

.&J

~

AS 60 I \

"'0" I \

50 I

~ I (+26, 50 )

I (-30, 50 )

~

Il4 40 I

i I

I i 30 20 10 I I I I o I i

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

Page 11 of 11