NL-06-1092, Cycle 13 Core Operating Limits Report

Cycle 13 Core Operating Limits Report

ML061520131
Person / Time
Site:	Vogtle
Issue date:	05/31/2006
From:	Grissette D Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-06-1092
Download: ML061520131 (16)

Text

Don E. Grissette Southern Nuclear Vice President Operating Company, Inc.

40 lnverness Center Parkway Post Office Box 1295 Birmingham, Alabama 35201 Tel 205.992.6474 Fax 205.992.0341 COMPANY May 3 1 , 2006 Energy to Serve Your World" Docket Nos.: 50-424 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-000 1 Vogtle Electric Generating Plant Unit 1 Cycle 13 Core Operating; Limits Report Ladies and Gentlemen:

Pursuant to the reporting requirements of Vogtle Electric Generating Plant (VEGP)

Technical Specification 5.6.5 Southern Nuclear Operating Company (SNC) is submitting Revision 3 of the Unit 1 Cycle 13 Core Operating Limits Report (COLR).

This letter contains no NRC commitments. If you have any questions, please advise.

Sincerely, fl Don E. Grissette

Enclosure:

Unit 1 Cycle 13 Core Operating Limits Report cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. T. E. Tynan, General Manager - Plant Vogtle RType: CVC7000 U. S. Nuclear Regulatory Commission Dr. W. D. Travers, Regional Administrator Mr. C. Gratton, NRR Project Manager - Vogtle Mr. G. J. McCoy, Senior Resident Inspector - Vogtle

VOGTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 1 CYCLE 13 CORE OPERATING LIMITS REPORT REVISION 3 May 2006

COLR for VEGP UNlT 1 CYCLE 13 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP UNlT 1 CYCLE 13 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.I SHUTDOWN MARGIN - MODES 1 and 2 The Technical Specifications affected by this report are listed below:

3.1.I SHUTDOWN MARGIN - MODES 3,4and 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 IVuclear Enthalpy Rise Hot Channel Factor - I=,H 3.2.3 Axial Flux Difference 3.9.1 Boron Concentration PAGE 1 of 14

COLR for VEGP UNIT 1 CYCLE 13 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 Aklk.

2.2 SHUTDOWN MARGIN - MODES 3, 4 AND 5 (Specification 3.1 . l )

2.2.1 The SHUTDOWN MARGIN shall be greater than or equal to the limits shown in Figures 1 and 2.

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

The BOUAROIHZP - MTC shall be less positive than +0.7 x AklkPF for power levels up to 70 percent RTP with a linear ramp to 0 AklkPF at 100 percent RTP.

The EOUAROIRTP-MTC shall be less negative than

-5.50 x 104 A W ~ P F . ~

2.3.2 The MTC Surveillance limits are:

The 300 ppmlARO1RTP-MTC should be less negative than or equal to -4.75 x 1o4 AklkP~.'

The 60 ppmlAROlRTP-MTC should be less negative than

-5.35 x 1o4 AklkP~.'

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 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 banks shall be limited in physical insertion as shown in Figure 3.

1 Applicable for full-power T-average of 586.4OF to 587.4OF.

PAGE 2 of 14

COLR for VEGP UNIT 1 CYCLE 13 2.6 Heat Flux Hot Channel Factor - Fa(Z) (Specification 3.2.1)

FRTP 2.6.1 FQ(z) 5 p ' K(Z) for P > 0.5 FRTP FQ(Z) 1. 05 K(Z) for P 1.0.5 THERMAL POWER where: P =

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

F T;P 'K(Z) 2.6.4 FQ(z) 5 for P > 0.5 P W (Z)

F T;P *K(Z)

FQ(z) 5 for P 5 0.5 0.5

• W(Z) 2.6.5 W(Z) values are provided in Figures 7 through 9.

The following W(Z) factors will be valid provided that the measured axial offset (i.e., the axial offset measured by an in-core flux map) is within the range as defined by the validity table below.

COLR for VEGP UNIT 1 CYCLE 13 Axial Offset Validity for W(Z) Factors It is required that Minimum A 0 S Measured Axial Offset (MAO) 5 Maximum AO.

Linear interpolation should be performed on A 0 (%) to the burnup of the flux map.

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

2.7 Nuclear Enthalpv Rise Hot Channel Factor - F H

! (Specification 3.2.2) 2.7.1 F H

! I FZHT~ * (1 + PFAH* (1 - P))

THERMAL POWER where: P =

RATED THERMAL POWER 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 1935 ppm.'

1 This concentration bounds the condition of keffr 0.95 (all rods in less the most reactive rod) and subcriticality (aJ rods out) over the entire cycle. This concentration includes additional boron to address uncertainties and B depletion.

PAGE 4 of 14

COLR for VEGP UNIT 1 CYCLE 13 TABLE 1 FQ(Z)PENALTY FACTOR 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 burnups outside the range of the table, a penalty factor of 1.020 shall be used.

COLR for VEGP UNIT 1 CYCLE 13 500 1000 1500 2000 2500 RCS BORON CONCENTRATION (ppm)

FIGURE 1 REQUIRED SHUTDOWN MARGIN FOR MODES 3 AND 4 (FOUR LOOPS FILLED AND VENTED AND AT LEAST ONE REACTOR COOLANT PUMP RUNNING)

PAGE 6 of 14

COLR for VEGP UNIT 1 CYCLE 13 RCS BORON CONCENTRAT ION (ppm)

FIGURE 2 REQUIRED SHUTDOWN MARGIN FOR MODES 4 AND 5 (MODE 4 WHEN FIGURE 1 NOT APPLICABLE)

PAGE 7 of 14

COLR for VEGP UNIT 1 CYCLE 13 (Fully withdrawn*)

220 2 00 2 180 45

.d 160 B

m PI 2 140 rn Y

g 120 E

rn 2 100 5

a 80 2

60 40 20 0 1 1 I I I I I I I l I I I I I ~ I I I I I I I I I I I l I I I I I I I l I I I I I I I I I I I I I POWER (% of Rated Thermal Power)

• F'ully withdrawn shall be the condition where control rods are at a position within the interval 2 225 and 5 231 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.

FIGURE 3 ROD BANK INSER'TION LIMITS VERSUS % OF RATED THERMAL POWER PAGE 8 of 14

COLR for VEGP UNIT 1 CYCLE 13 CORE HEIGHT (feet)

FIGURE 4 K(Z) - NORMALIZED Fo(Z) AS A FUNCTION OF CORE HEIGHT

COLR for VEGP UNIT 1 CYCLE 13 AXIAL FLUX DIFFERENCE (percent h I )

FIGURE 5 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF % OF RATED THERMAL POWER FOR RAOC PAGE 10 of 14

COLR for VEGP UNIT 1 CYCLE 13 This data is intentionally deleted.

FIGURE 6 RAOC W(Z) AT 150 MWDIMTU PAGE 11 of 14

COLR for VEGP UNIT 1 CYCLE 13 Axial Elevation EOL-1 Point (feet) W(Z) 1 12.00 1.0000 2 11.80 1.0000 0.0 2.0 4.0 6.0 8.0 10.0 12.

Core Height - feet This flgure is referred to by Speeiflcation B3.2.1 These W(Z) values are consistent with Figure 5, and are valid over the HFP TWgtemperature range from 586.4 to 587.4OF.

See COLR Section 2.6.5 for A 0 Validity Ruler Top and Bottom 15% Excluded per Technical Specification B3.2.1 FIGURE 7 RAOC W(Z) AT 16,050 MWDIMTU PAGE 12 of 14

COLR for VEGP UNIT 1 CYCLE 1 3 Axia1 Elevation Point (feet)

• 1 12.00

• 2 11.80

• 3 11.60

• 4 1 1.40

• 5 1 1.20

• 6 11.00

• 7 10.80

• 8 10.60

• 9

• 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1.C 51 0.0 2.0 4.0 6.0 8.0 10.0 12.0 ** 52 C o r e H e i g h t - feet

• 54

• 55

• 56 1.00 i.0000

• 57 0.80 1.0000 This figure is referred to by Specification B3.2.1

• 58 0.60 1.0000

• 59 0.40 1.0000 These W(Z) values are consistent with Figure 5, and are valid

• 60 0.20 1.0000 over the HFP TavBtemperature range from 586.4 to 587.4OF.

• 61 0.00 1.0000 See COLR Section 2.6.5 for A 0 Validlty Rules

• Top and Bottom 15% Excludedpm Technical SpecificationB3.2.1 RAOC W(Z) AT 18,000 MWDIMTU PAGE 1 3 0 f 14

COLR for VEGP UNIT 1 CYCLE 13 Axi a1 Elevation EOL Point (feet) W(Z)

• 1 12.00 1.0000

• 2 11.80 1.0000 11.60 1.0000 11.40 1.0000 11.20 1.0000 11.00 1.0000 10.80 1.0000 10.60 1.0000 10.40 1.0000 10.20 1.0000 10.00 1.1725 9.80 1.1705 9.60 1.1706 9.40 1.1740 9.20 1.1862 9.00 1.1959 8.80 1.2052 8.60 1.2140 C o r e Height - feet This figure is referred to by Specifleation B3.2.1 These W(Z) values are consistent wlth Figure 5, and are valid over the HFP TWgtemperature range from 5864 to 587.4OF.

See COLR Sectlon 2.6.5 for A 0 Validity Rules + Topand Bottom 15% Excluded per Techn~icalSpecification B3.2.1 FIGURE 9 RAOC W(Z) AT 20,000 MWDIMTU PAGE 14 of 14