NL-14-0753, Cycle 19 Core Operating Limits Report

Cycle 19 Core Operating Limits Report

ML14134A588
Person / Time
Site:	Vogtle
Issue date:	05/13/2014
From:	Pierce C Southern Co, Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-14-0753
Download: ML14134A588 (16)

Text

Charles R. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc.

40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35201 Tel 205.992.7872 Fax 205,992.7601 MAY 1 3 2014 Docket Nos.: 50-424 NL-14-0753 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant Unit 1 Cycle 19 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 1 Cycle 19, Version 1.

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

Respectfully submitted.

C. R. Pierce Regulatory Affairs Director CRP/GLS/

Enclosure:

Core Operating Limits Report, VEGP Unit 1 Cycle 19, Version 1

U. S. Nuclear Regulatory Commission NL-14-0753 Page 2 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 1 & 2 Mr. B. L Ivey, Vice President - Regulatory Affairs Mr. D. R. Madison, Vice President - Fleet Operations Mr. B. J. Adams, Vice President - Engineering Mr. S. C. Waldrup, Regulatory Affairs Manager - Vogtle RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager - Vogtle 1 &2 Mr. L. M. Cain, Senior Resident Inspector-Vogtle 1 & 2

Vogtle Electric Generating Plant Unit 1 Cycle 19 Core Operating Limits Report Enclosure Core Operating Limits Report, VEGP Unit 1 Cycle 19, Version 1

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 1 CYCLE 19 CORE OPERATING LIMITS REPORT Version 1 February 2014

Westinghouse Non-Proprietary Class3 APPENDIX A VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 1 CYCLE 19 CORE OPERATING LIMITS REPORT (COLR)

Version 1 February 2014

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 1 Cycle 19 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 Channnel Factor - f'^ah 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 11

CORE OPERATING LMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 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 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 Ak/k.

2.2 SHUTDOWN MARGIN - MODES 3.4 and 5 (Specification 3.1.n 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/ARO/HZP-MTC shall be less positive than +0.7 x 10"^ Ak/k/°F for power levels up to 70% RTP with a linear ramp to 0 Ak/k/°F at 100% RTP.

TheEOL/ARO/RTP-MTC shall be less negative than-5.50 x 10"^ Ak/k/°F.'

2.3.2 The MTC Surveillance limits are; The 300 ppm/ARO/RTP-MTC should be less negative than or equal to

-4.75 X 10-" Ak/k/°F.'

The 60 ppm/ARO/RTP-MTC should beless negative than -5.35 x 10"^ Ak/k/°F.'

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

' Applicable forfull-power T-average of 584.1 to 587.1 °F, Page 2 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 Shutdown Bank Insertion Limits (Specification 3.1.5) 2.4.1 The shutdown banks shall be withdrawn to a positiongreaterthan or equalto 225 steps.

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.

Heat Flux Hot Channel Factor- Fn/Zt (Specification 3.2.1) 2.6.1 Fo(Z)<-5 K(Z) for?>0.5 Fo(Z)<-^ K(Z) for P<0.5 THERMAL POWER where: P = -

RATED THERMAL POWER 2.6.2 F^'"' =2.50 2.6.3 K(Z) is provided in Figure 4.

KiZ) 2.6.4 Fo(Z)<-2 IlJ. for P> 0.5 P-W{Z)

F^"^ -KCZ)

Fo(Z)<-^ forP50.5 0.5-W^Z) 2.6.5 W(Z) values are provided in Table 2.

2.6.6 TheFq(Z) penalty factors are provided in Table 1.

Page 3 of 11

CORE OPERATTNG LIMITS REPORT. VEGP UNIT 1 CYCT.F. 19 FEBRUARY 2014 2.7 Nuclear Enthalpy Rise Hot Channel Factor - F (Specification 3.2.2) 2.7.1 S Fi" *(I+ *{!-?))

THERMAL POWER where: P =

• RATED THERMAL POWER 2.7.2 F^'-=\.65 2.1.3 PF^ = 0.3 Axial Flux Difference (Specification 3.2.3) 2.8.1 The Axial Flux Difference (AFD) Acceptable Operation Limits are provided in Figure 5.

Boron Concentration (Specification 3.9.1) 2.9.1 The boron concentration shall be greater than orequal to 1880 ppm.^

^ This concentration bounds the condition of keii^ 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' depletion.

Page 4 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 Table 1 Fq(Z) penalty factor Cycle Bumup Fq(Z) Penally Factor (MWD/MTU) 1.0348 1.0391 1.0417 1.0423 1.0410 1.0366 1.0308 1.0248 1.0200 1.0200 1.0204 1.0262 1.0261 1.0244 1.0214 1.0200 Notes:

1. The PenaltyFactor, 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 bumup at which the Fq(Z) was determined.

2. Linear interpolation is adequate for intermediate cycle bumups.

3. For all cycle burnups outsidethe rangeof the table, a penally factor of 1.020 shallbe used.

Pages of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 20 4 Table 2 RAOC wrz)

Axial Elevation 150 3000 12000 20000 Point (feet) MWD/MTU MWD/MTU MWD/MTU MWD/MTU 12.072-11.267 1.0000 1.0000 1.0000 1.0000 11.066 1.3172 1.3495 1.3279 1.2728 10.865 13162 1.3440 1.3244 1.2665 10.664 1.3018 1.3350 1.3164 1.2561 10.462 1.2808 1.3167 I.30S1 1.2438 10.261 1.2615 1.2912 1.2919 1.2294 10.060 1.2467 1.2683 1.2775 1.2189 9.859 1.2503 1.2431 1.2614 1.2150 9.658 1.2444 1.2130 1.2438 IJi096 9,456 L2373 1.1979 1.2384 1.2144 9.255 1.2278 1.1893 1,2286 1.2272 9.054 1.2168 1.1763 1.2165 1.2359 8.853 1.2020 1.166Z 1.2092 1.2397 8.652 1.1893 1.1670 1.2141 1.2426 8.450 1.1900 1.1724 1.2230 1.2438 8.249 1.1889 1.1761 1.2290 1.2500 8.048 1.1918 1.1783 1.2332 1.2591 7.847 1.1940 1.1780 1.2344 1.2670 7.646 1.1935 1.1761 1.2336 1.2800 7.444 1.1914 1.1728 1.2315 1.2895 7.243 1.1867 I.I674 1.2259 1.2944 7.042 1.1802 1.1604 1.2178 1.2950 6.841 1.1724 1.1523 1.2083 1.2931 6.640 1.1633 1.1459 1.1988 1.2890 6.438 1.1529 1.1393 1.1896 1.2819 6.237 1.1452 1.1326 1.1801 1.2719 6.036 1.1401 1.1279 1.1696 1.2596 5.835 1.1344 1.1252 1.1608 1.2478 5.634 1.1321 1.1225 1.1560 1.2400 5.432 1.1309 1.1258 1.1590 1.2349 5.231 1.1317 1.1378 1.1643 1.2349 5.030 1.1386 1.1484 1.1706 1.2348 4.829 1.1477 1.1587 1.1753 1.2344 4.628 1.1561 1.1683 1.1790 1.2333 4.426 1.1640 1.1775 1.1815 1.2302 4.225 1.1710 1.1856 1.1829 1.2254 4.024 1.1770 1.1930 1.1833 1.2191 3.823 1.1826 1.1994 1.1822 1.2100 3.622 1.1872 1.2065 1.1795 1.1985 3.420 1.1925 1.2159 1.1763 1.1861 3.219 1.1985 1.2241 1.1722 1.1765 3.018 1.2057 1.2377 I.I765 1.1776 2.817 1.2190 1.2562 1.1889 1.1890 2.616 1.2337 1.2794 1.2020 1.2019 2.414 1.2476 1.3058 1.2149 1.2147 2.213 1.2616 1.3328 1.2279 1.2275 2.012 1.2755 1.3595 1.2399 1.2386 1.811 1.2893 1.3858 1.2514 1.2491 1.610 1.3024 1.4105 1.2627 1.2601 1.408 1.3149 1.4336 1.2737 1.2714 1.207 1.3269 1.4550 1.2843 1.2828 1.006 1.3380 1.4742 1.2943 1.2945 57-61 0.805-0.000 1.0000 l.OOOO 1.0000 l.OOOO Top and Bottom 5 Points Excluded per Technical Specification B3.2.1.

These W(Z) values are consistent with Figure 5, and are valid over tlie HFP Tavg temperature rangefrom 584.1 to 587.1°F.

Page 6 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING)

ACCEPTABLE OPERATING REGION (2400, 3.lb)

"S 3-° IREQUIRED SHUTDOWN MARGIN (lioo, i.2b)

O 2.0 gm UNACCEPTABLE OPERATING REGION (65d, 1.3^0) 500 1000 1500 RCS BORON CONCENTRATION (ppm)

Page? of 11

(2$00L i.9ph ACCEPTABLE OPERATING REGION REQUIRED SHUTDOWN MARGIN 1250, a.8B) 0 200 RCS BO N (ppm)

Page 8 of

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 FIGURES ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn )

iiisaiaiaiyiigBSgS^^S S 180 111 h

160 SSS' Se'SSSSSSSSSSSSSSSSSSSI m

S<

S 140 ******I O 120 H

!i3:

g 100 s H

W ***SIHI

• • a S3 B

<< 80 wmmmumuut ********I

• SSSSS

• SSSSSSSESSSSSSSSSSSSSnSSSSSS^

BaianmHHHB

[*******111! *************in

>0 30 40 50 60 70 80 POWER (% of Rated Thermal Power)

• Fully withdrawn shall bethe condition where control rods are ata position within the interval S 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 1 CYCLE 19 FEBRUARY 2014 FIGURE 4 K(Z) - NORMALIZED Fq(Z) AS A FUNCTION OF CORE HEIGHT o

FQ = 2.50 CORE HT. K(Z) 0.00 1.00 O 0.6 6.00 1.00 12.0 .925 4 6 CORE HEIGHT (feet)

Page 10 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % RATED THERMAL POWER FORRAOC

(+10, 100)

UNACCBPTMLE rt 80

^

<u 70

• dP 50

(-30, 50)

-40 -30 -20 -10 0 10 20 30 AXIAL FLUX DIFFERENCE (percent Al)

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