NL-14-1719, Cycle 18 Core Operating Limits Report, Version 1

Cycle 18 Core Operating Limits Report, Version 1

ML14303A697
Person / Time
Site:	Vogtle
Issue date:	10/30/2014
From:	Pierce C Southern Co, Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-14-1719
Download: ML14303A697 (16)

Text

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

40 Inverness Center Parkway Post Office Box 1295 Birmingham, Alabama 35201 Tel 205.992.7872 Fax 205.992.7601 OCT 3 0 20U Docket Nos.: 50-425 NL-14-1719 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant, Unit 2 Unit 2 Cycle 18 Core Operatinq 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 18, Version 1.

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

Respectfully submitted.

A).

C. R. Pierce Regulatory Affairs Director CRP/RMJ

Enclosure:

Core Operating Limits Report, VEGP Unit 2 Cycle 18, Version 1

U. S. Nuclear Regulatory Commission NL-14-1719 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. D. R. Madison, Vice President - Fleet Operations Mr. B. L. Ivey, Vice President - Regulatory Affairs Mr. B. K. Taber, Vice President - Vogtle 1 & 2 Mr. B. J. Adams, Vice President - Engineering Mr. G.W. Gunn, Regulatory Affairs Manager - Vogtle 1 & 2 (Acting)

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 2 Cycle 18 Core Operating Limits Report Enclosure Core Operating Limits Report, VEGP Unit 2 Cycle 18, Version 1

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE 18 CORE OPERATING LIMITS REPORT Version 1 August 2014

Westinghouse Non-Proprietary Class 3 APPENDIX A VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 2 CYCLE CORE OPERATING LIMITS REPORT (COLR)

Version I August 2014

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP Unit 2 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 Channnel Factor - f'^ah 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration Page 1 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section I.O 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 fSpecification 3.1 .H 2.2.1 The SHUTDOWN MARGIN shall be greater thanor 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 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 linearramp to 0 Ak/k/°F at 100% RTP.

The EOL/ARO/RTP-MTC shall be less negative than -5.50 x 10" Ak/ky°F.'

2.3.2 The MTC Surveillance limits are:

The300 ppm/ARO/RTP-MTC should be less negative than or equal to

-4.75 X lO"Ak/k/°F.'

The 60 ppm/ARO/RTP-MTC should be less 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 for full-power T-average of 583.8 to 586.8 °F.

Page 2 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 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.

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 - Fq(Z) (Specification 3.2.1) 2.6.1 F^{,Z)<^-K{Z) for P>0.5

- K{Z) for P< 0.5 THERMAL POWER where: P =

RATED THERMiL POWER 2.6.2 Fn^ =2.50 2.6.3 K(Z) is provided in Figure 4.

2.6.4 FAZ)<

Fq" -KjZ) for P > 0.5 PW{Z)

^o(Z)< for P < 0.5 0.5-WiZ) 2.6.5 W(Z) values are provided in Table 2.

2.6.6 The Fq(Z) penalty factors are provided in Table Page 3 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 2.7 Nuclear Enthalpy Rise Hot Channel Factor - F ah (Specification 3.2.2) 2.7.1 THERMAL POWER where: P =

RATED THERMAL POWER 2.7.2 2.7.3 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 begreater than or equal to 1793 ppm.^

This concentration bounds the condition of ke)T< 0.95 (all rods in less the most reactive rod) and subcriticality rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B' depletion. The boron concentration includes credit for Samarium.

Page 4 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 Table 1 Fo(Z) PENALTY FACTOR Cycle Burnup Cycle Burnup Fq(Z) Penalty Factor Fq(Z) Penalty Factor (MWD/MTU) (MWD/MTU) 1.0259 1.0628 1.0241 1.0652 1.0243 1.0244 1.0640 1.0243 1.0495 1.0236 1.0200 1.0233 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 bumups.

3. For all cycle bumups 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 18 AUGUST 20 4 Table 2 RAOC W(Z)

Axial Elevation 150 4000 12000 20000 Point (feet) MWD/MTl MWD/Mll MWD/MTl MWD/MTIJ 12.072- 11.267 1.0000 1.0000 .0000 1.0000 11.U66 1.3351 1.3680 .2203 1.2465 10.865 1.3271 1.3584 .2230 1.2436 10.664 13071 1.3490 .2236 1.2326 10.462 1.2854 IJ3S7 .2229 1.2175 10.261 1.2690 1.3157 .2226 1.2050 10.060 1.2510 1.2939 .2232 1.1937 9.859 1.2304 1.2708 .2266 1.1974 9.658 1.2306 1.2469 .2197 1.2013 9.456 1.2273 1.2308 .2121 1.2046 9.255 1.2252 1.2187 1.2096 1.2073 9.054 1.2213 1.2042 1.2054 1.2108 8.853 1.2197 1.1924 1.1938 1.2112 8,652 1.2201 1.1927 1.1869 1.2104 8.450 1.2238 1.1965 1.1904 1.2138 8.249 1.2239 1.1984 1.1944 1.2237 8.048 1.2287 1.1986 1.2037 1.2395 7.847 1.2299 1.1962 1.2096 1.2518 7.646 1.2288 1.1921 1.2136 1-2623 7.444 1.2256 1.1867 1.2160 1.2712 7.243 1.2196 1.1789 1.2149 1.2758 7.042 1.2114 1.1695 1.2111 1J768 6.841 1.2018 1.1590 1.2056 1.2757 6.640 1.19U8 .1506 1.1989 1.2728 6.438 1.1783 .1417 1.1902 1.2700 6.237 1.1655 .1326 1.1810 1.2654 6.036 1.1548 .1257 1.1711 1.2595 5.835 1.1466 .1209 1.1605 1.2521 5.634 1.1383 .1165 1.1607 1.2430 5.432 1.1349 .1188 1.1627 1.2376 5.231 1.1362 .1290 1.1700 1.2380 5.030 1.1418 .1378 1.1765 1.2409 4.829 1.1465 1.1464 1.1821 1.2415 4.628 1.1517 1.1544 1.1865 1.2401 4.426 1.1569 1.1619 1.1898 1.2367 4.225 1.1610 1.1685 1.1917 1.2315 4.024 1.1642 1.1744 1.1929 1.2249 3.823 1.1673 1.1795 1.1935 1.2154 3.622 1.1729 1.1835 1.1930 1.2032 3.420 1.1789 1.1882 1.1915 1.1906 3.219 1.1835 1.1925 1.1899 1.1771 3.018 1.1873 1.2046 1.1930 1.1743 2.817 1.1934 1,2243 1.2051 1.1825 2.616 1.2079 1.2478 1.2186 1.1945 2.414 1.2243 1.2721 1.2317 1.2062 2.213 1.2404 1.2968 1.2449 1.2181 2.012 1.2567 1.3215 1.2571 1.2282 I.81I 1.2728 1.3459 1.2687 1.2378 1.610 1.2883 1.3691 1.2801 1.2480 1.408 1.3032 1.3911 1.2913 1J588 1.207 1.3175 1.4117 1.3020 1.2697 1.006 1.3310 1.4303 1.3123 1.2811 0.805-0.000 1.0000 1.0000 1.0000 1.0000 lop and Bottom 5 Points Excluded per Technical Specirication B3.2.1.

These W(Z) values areconsistent with Figure 5, and arevalid over the HFP Tavg temperature range from 583.8 to 586.8°F.

Page 6 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING)

ACCEPTABI REQUIRED SHUTDOWN MARGIN 1 -

(1^0(1, 2.25)

§ 2.0 UNACCEPTABLE OPERATING REGION j95b, l.io)

RCS BORCW CONCEKTRATION (ppm)

Page 7 Of II

CORE OPERATrNG LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE)

(2Boq, i.90) 1r-i ACCEPTABLE OPERATING REGION JIRED SHUTDOWN MA^RGINl (ii25(i, fe.as) I S

Eh 2.0 D

X w .UNACCEPTABLE OPERATING REGION

^460, l.i)0)l RCS BORON CONCENTRATION (ppm)

Page 8 of 11

CORE OPERATING LIMITS REPORT, VEGP UNIT 1 CYCLE 19 FEBRUARY 2014 FIGURE 3 ROD BANK INSERTION LLMITS VERSUS % OF RATED THERMAL POWER (Fully Withdrawn )

(MiQfeL 1212] )7I8I.0%,I B2g)

^BANK B I 180 TO u

s UO-U

-H 160 s

IIBHI O 120 H

H W

g 100

<< 80 BBlMMg 0 10 20 30 40 50 60 70 80 90 lOO POWER (% of Rated Thermal Power)

'Fullywithdrawn shall bethe condition where control rods are ata 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 1 CYCLE 19 FEBRUARY 2014 FIGURE 4 K(Z) - NORMALIZED Fq(Z) AS A FUNCTION OF CORE HEIGHT

?Q = 2.50 CORE HT. K(Z) 0.00 1.00 O 0.6 6.00 1.00 a 12.0 .925 CORE HEIGHT (feet)

Page 10 of 11

CORE OPERATING LIMITS REPORT. VEGP UNIT 2 CYCLE 18 AUGUST 2014 FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % RATED THERMAL POWER FOR RAOC

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

SLCCEPmBUB i^ACCEElTABUE 0

0 80 01 CEPTABLE "S 60 "S 50 C6 40 40 50 AXIAL FLUX DIFFERENCE (percent AI)

Page 11 of 11