NL-12-2622, Unit 1 Cycle 18 Core Operating Limits Report

Unit 1 Cycle 18 Core Operating Limits Report

ML12355A348
Person / Time
Site:	Vogtle
Issue date:	12/19/2012
From:	Ajluni M Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
NL-12-2622
Download: ML12355A348 (14)

Text

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

40 Inverness Center Parkway Post Office Box 1295 Birmingham. Alabama 35201 Tel 205.992.7673 Fax 205.992.7885 December 19, 2012 SOUTHERN ' \ '

COMPANY Docket Nos. : 50-424 NL-12-2622 U. S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant Unit 1 Cycle 18 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 Unit 1 Cycle 18, Version 1.

This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.

Respectfully submitted, M. J. Ajluni Nuclear Licensing Director MJAlRMJ/lac

Enclosure:

Core Operating Limits Report, VEGP Unit 1 Cycle 18, Version 1

U. S. Nuclear Regulatory Commission NL-12-2622 Page 2 cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. T. E. Tynan, Vice President - Vogtle Mr. B. L. Ivey, Vice President - Regulatory Affairs Mr. B. J. Adams, Vice President - Fleet Operations RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager - Vogtle Mr. L. M. Cain, Senior Resident Inspector - Vogtle

VogUe Electric Generating Plant Unit 1 Cycle 18 Operating limits Report Enclosure Core Operating limits Report, VEGP Unit 1 Cycle 18, Version 1

CORE OPERATING LIMITS REPORT, VEGP UNIT I CYCLE 18 JULY 2012 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit I Cycle 18 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 I 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 - FN 6H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 11

CORE 18 JULY cycle-specific parameter limits specifications listed Section 1.0 are in follow subsections. These limits have been developed using NRC-approved methodologies including those specified in Technical Specification 2.1 Requirement 13.1.1) 2.1.1 The SHUTDOWN MARGIN shall greater than or equal to 1.30 percent dklk.

2.2 (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 Coefficient (MTC) limits are:

The BOLIAROIHZP-MTC shall less positive than +0.7 x 10-4 ilk/kloF for power up to 70% with a ramp to 0 ilklkloF at 100%

The EOLIARO/RTP-MTC shall be less negative than 2.3.2 The MTC limits are:

300 ppmlARO/RTP-MTC should than or equal to x 10-4 ilklkl0F, I The 60 ppmlAROIRTP-MTC should be less negative than -5.35 x 10-4 dk/kloF.!

where: BOL stands for Beginning ofCycie Life ARO stands for All Rods Out Hot POWER EOL stands End of Life RTP stands for THERMAL POWER I Applicable for full-power of Page 2 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 18 JULY 2012 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 - FO(Z) (Specification 3.2.1)

F RTP 2.6.1 F Q(Z) <.5, Q . K(Z) for P > 0.5 p

F RTP F Q(Z) <.5, ~.5 . K(Z) for P ~ 0.5 THERMAL POWER where: P = -------------------

RATED THERMAL POWER 2.6.2 2.6.3 K(Z) is provided in Figure 4.

RTP FQ *K(Z) 2.6.4 F Q(Z)<.5, p. W(Z) forP> 0.5 RTP FQ *K(Z)

F Q(Z) <.5, 0.5. W(Z) for P ~ 0.5 2.6.5 W(Z) values are provided in Table 2.

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

Page 3 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT I 18 JULY 2012

~~~~;!.!!!.;¥-J.-~~~~'~~~~!.!. - FN AH (Specification 3.2.2)

THERMAL POWER where: P POWER

~TP 1.65 AH 2.7.3 Pl'~ 0.3 2.8 ~~"-'-"'~~~~ (Specification 3.2.3)

Axial Flux (AFD) Acceptable Operation Limits are provided in 5.

2.9 J;iQ[Q!]W;)lli;mtm.t!Q!l (Spec i fica ti on 1) 2.9.1 The boron concentration shall be greater than or equal to 1885 ppm. I lThis concentration bounds the condition of 0.95 (all less the most rod) and rods out) over concentration includes additional boron to

<lnr..."",,, uncertainties and depletion.

Page 4 of 11

OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 18 JULY 2012 Table 1 FQ(Z) PENALTY FACTOR Cycle FQ(Z)

Bumup Penalty (MWD/MTU) Factor All Bumups 1.020

1. The Penalty to be applied to FQ(Z) in with SR is the by which FQ(Z) is expected to increase over a 39 EFPD interval (surveillance interval of 31 plus the maximum allowable extension not to exceed 25% the surveillance interval per 3.0.2) start ing from bumup at which the F Q(Z) was detennined.

Page 5 of 11

CORE OPERATING LIMITS 18 2012 Table 2 RAOCW(Z)

Axial Elevation 150 4000 12000 20000 Point MWDIMTU MWDIMTU MWDIMTU MWDIMTU

• 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 1.3290 1.3204 1.2840 1.2136 7 10.80 1.3203 1.3184 1.2772 1.2046 8 10.60 1.3125 1.3127 1.2703 1.1994 9 10.40 1.3003 1.3038 1.2632 1 1966 10 JO.20 1.2872 1.2946 1.2548 1.1987 II 10.00 1.2880 1.2884 1.2435 1.2052 12 9.80 1.2846 1.2824 1.2318 1.2141 13 9.60 1.2761 1.2722 1.2256 1.2218 14 9.40 1.2656 1.2584 1.2227 1.2272 15 9.20 1.2489 1.2440 1.2154 1.2322 16 9.00 1.2322 1.2257 1.2095 1.2331 17 8.80 1.2195 1.2092 1.2026 1.2322 18 8.60 1.2163 1.2033 1.2015 1.2353 19 8.40 1.2198 1.2025 1.2072 1.2473 20 8.20 1.2206 1.2003 1.2101 1.2578 21 8.00 1.2268 1.2029 1.2163 1.2711 22 7.80 1.2321 1.2045 1.2213 1.2824 23 7.60 1.2334 \.2028 1.2228 1.2897 24 7.40 1.2325 1.1991 1.2221 1.2940 25 7.20 1.2290 1.1933 1.2190 1.2951 26 7.00 1.2233 1.1856 1.2137 1.2932 27 6.80 1.2157 11762 1.2064 1,2885 28 6.60 1.2066 J.l660 1.1972 1.2810 29 6.40 1.1970 1.1557 1.1869 1.2713 30 6.20 1.1869 1.1451 1.1767 1.2606 31 6.00 1.1752 1.1379 1.1640 1.2481 32 5.80 1.1642 1.1321 1.1562 1.2339 33 5.60 \.1566 1.1306 1.1569 1.2264 34 5.40 1.1551 1.1369 1.1621 1.2263 35 5.20 1.1613 1.1454 1.1673 1.2302 36 5.00 1.1672 1.1533 1.1714 1.2323 37 4.80 1.1715 1.1603 1.1744 1.2322 38 4,60 1.1751 1.1667 1.1762 1.2302 39 4.40 1.1776 1.1721 1.l767 1.2260 40 4.20 1.1790 1.1767 1.1761 1.2199 41 4,00 1.1792 1.1803 1.1741 1.2119 42 3,80 1.1785 1.1830 1.1721 1.2020 43 3,60 1.1765 \.1847 1.1720 1.1909 44 3.40 1.1739 1.1870 1.1737 1.1805 45 3.20 1.1757 1.1949 1.1755 1.1733 46 3.00 1.1867 1.2059 1.1817 1.1711 47 2.80 1.2005 1.2207 1.1896 1.1748 48 2.60 1.2132 1.2402 1.1961 1.1876 49 2.40 1.2275 1.2622 1.2026 1.1984 50 2.20 1,2430 1.2839 1.2112 1.2092 51 2.00 1.2584 1.3051 1.2210 1.2200 52 1.80 1.2737 1.3259 1.2310 1.2309 53 1.60 1.2887 1.3457 1.2409 1.2420 54 lAO 1.3033 1.3646 1.2506 1.2531 55 1.20 1.3174 1.3821 1.2601 1.2642 56 1.00 1.3302 1.3973 1.2685 1.2747

'" 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 l.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 Technical Specification 83.2.1.

W(Z) values are consistent with 5, and are valid over range from 1 to Page 6of11

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 18 JULY 2012 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 b)

~

<I 3 . 0 ./

cIP V

~

~

Z H

REQUIRED SHUTDOWN MARGIN I "..,.,..

G /

~

./

(1 00, .2 p) "..,.,..-

~

~ /

V 0 2.0 0

~ V

$til V V

/V IUNACCEPTABLE OPERATING REGION I

( 35C , .oJ 0) 1.0 0.0 o 500 1000 1500 l 2000 2500 RCS BORON CONCENTRATION (ppm)

Page 7 of 11

OPERATING LIMITS REPORT, 18 JULY 2012 FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN 1 NOT APPLICABLE) 5.0 l

~

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UNACCEPTABLE OPERATING REGION :

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, I 0.0 I I I . I I I i o 500 1000 1500 2000 250(

RCS BORON CONCENTRATION (ppm) 8 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 18 JULY 2012 FIGURE 3 ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn*)

220 V I( .O~ 225 V 78

• I~ ~ : 5)

/ /

~ ~

V 200 BANK B L L

/ 1/

V' /

/ V

~ :0% :61 / ( Ie % 61

~

III 0.

21til 140

./ L z

0120 /

BANK C 1/

H / /

H

(-I V V til / /

V V

~ 100 V V

/

'/ 1/ BANK D 60 1/ /

/ V V V V /

0"6 46) V 40 ~

20 10_ .2 tI; O,J 1/

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

Page 9 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT l CYCLE 18 JULY 2012 FIGURE 4 K(Z) - NORMALIZED FQ(Z) AS A FUNCTION OF CORE HEIGHT 1.4 1.2 D::

o

~

u r:: 1. 0

~

H

~

I":Il At 0.8 FQ = 2.50 Q

I":Il CORE N

H HT. K(Z)

~

0 . 00 1. 00 00.6 6.00 1. 00 Z 12.0 .925 N

0.4 0.2 0.0 o 2 4 6 8 10 12 CORE HEIGHT (feet)

Page 10 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 18 JULY 2012 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % OF RATED THERMAL POWER FORRAOC 120 110

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

/ f\

,o

~

Q) 90 U ~AC "EP' ABI E I \ UNl CCl PTJ! BLE Po. II \

r;; 80 I l\

e I \

I Q)

.!:l

~ 70 II At'CE TA LE

\

'0 1\

Q)

.w

~ 60

/ \

4-1 o

/ \

o'fl 50 II 1\

1 (-30, 50) I (+26, 50 )

30 20 10 o

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

Page 11 of 11