NL-05-1739, Cycle 12 Core Operating Limits Report

Cycle 12 Core Operating Limits Report

ML052760035
Person / Time
Site:	Vogtle
Issue date:	09/30/2005
From:	Grissette D Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-05-1739
Download: ML052760035 (16)

Text

Don E. Grisselte Southern Nuclear Vice President Operating Company, I ~ c .

40 lnverness Center Parkway Post Office Box 1295 Birmingham, Alabama 35201 Tel 205.992.6474 Fax 205.992.0341 SOUTHERN&

1 COMPANY Energy to Serve Your World" Docket No.: 50-425 NL-05-1739 U. S. Nuclear Regulatory Commission AlTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant Unit 2 Cvcle 12 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 0 of the Unit 2 Cycle 12 Core Operating Limits Report (COLR).

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

Sincerely, Don E. Grissette

Enclosure:

Unit 2 Cycle 12 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 2 CYCLE 12 CORE OPERATING LIMITS REPORT REVISION 0 SEPTEMBER 2005

COLR for VEGP UNlT 2 CYCLE 12 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report (COLR) for VEGP UNlT 2 CYCLE 12 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 SHU'TDOWN MARGIN - MODES 1 and 2 The Technical Specifications affected by this report are listed below:

3.1.1 SHU'TDOWN 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 - F":

3.2.3 Axial Flux Difference 3.9.1 Boron Concentration PAGE 1 of 14

COLR for VEGP UNIT 2 CYCLE 12 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. l )

2.1 .I The SHUTDOWN MARGIN shall be greater than or equal to 1.30 percent AWk.

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

The BOUARO/HZP - MTC shall be less positive than +0.7 x lo4 AWWF for power levels up to 70% RTP with a linear ramp to 0 AWPF at 100% RTP.

The EOUAROIRTP-MTC shall be less negative than -5.50 x lo4 AWWF.'

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 104 AWWF.'

The 60 ppm/ARO/RTP-MTC should be less negative than

-5.35 x lo4 AWWF.'

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 R'TP stands for RATED THERMAL POWER 2.4 Shutdown Bank lnsertion 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 lnsertion Limits (Specification 3.1.6) 2.5.1 The control banks shall be limited in physical insertion as shown in Figure 3.

' Applicable for full-power T-average of 586.4OF to 587.4OF.

PAGE 2 OF 14

COLR for VEGP UNIT 2 CYCLE 12 Heat Flux Hot Channel Factor - FQ(Z)(Specification 3.2.1)

RTP FQ 2.6.1 FQ(Z)I K(Z) for P > 0.5 P

RTP FQ FQ(Z)I

• K(Z) for P I0.5 0.5 THERMAL POWER where: P =

RATED 'THERMAL POWER RTP 2.6.2 FQ = 2.50 2.6.3 K(Z) is provided in Figure 4.

RTP 2.6.4 FQ(Z)5 FO

• K(Z) for P > 0.5 P W(Z)

RTP FQ(Z)IFa

• K(Z) for P 10.5 0.5 W(Z) 2.6.5 W(Z) values are provided in Figures 6 through 9.

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

PAGE 3of 14

COLR for VEGP UNIT 2 CYCLE 12 2.7 Nuclear Enthalpv Rise Hot Channel Factor - FH  ! (Specification 3.2.2) where: P =

THERMAL POWER 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 1950 ppm.'

his concentration bounds the condition of kens 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 14

COLR for VEGP LlNlT 2 CYCLE 12 TABLE 1 Fa(Z) PENALTY FACTOR Cycle Fa(Z)

Burnup Penalty

{MWDIMTU) Factor 5061 1.020 Notes:

1. 'The Penalty Factor, to be applied to Fa(Z) in accordance with SR 3.2.1.2, is the maximum factor by which Fa(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 Fa(Z) was determined.

2. Linear interpolation is adequate for intermediate cycle bumups.

3. For all cycle burnups outside the range of the table, a penalty factor of 1.020 shall be used.

PAGE 5 of 14

COLR for VEGP UNIT 2 CYCLE 12 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 2 CYCLE 12 5.00 K 4.00 4 ACCEPTABLE w

c OPERATING

! REGON w

P z

a 3.00 3

f0 5n 2.00 I

V)

O w

-2a e l.OO

[r 0.00 (460,1.00)

UNACCEPTABLE OPERATING REGION 0 500 lo00 1500 2000 2500 a751 RCS BORON CONCENTRATION (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 2 CYCLE 12 (Fully Withdrawn ')

0 20 40 60 80 (Fully Inserted)

POWER (percent of rated thermal power)

Fully withdrawn shall be the conditii where control rods are at a positiin within the interval 2225 and 4 3 1 steps withdrawn.

Note: The Rod Bank Insertion Limits are based on the control bank withdrawal sequence A, B, C, D and a control bank tipto-tip distance oi 115 steps.

FIGURE 3 ROD BANK INSERTION LIMITS VERSUS % OF RATED THERMAL POWER PAGE 8 of 14

COLR for VEGP UNIT 2 CYCLE 12 1.40 1.20 1.oo ----

0.80 0.60 FQ= 2.50 CORE 0.40 HEIGHT K(Z) 0.000 1.om 6.000 1.OW 12.000 0.925 0.20 0

0 2.0 4.0 6.0 8.0 10.0 12.0 CORE HEIGHT (ft)

FIGURE 4 K(Z) - NORMALIZED FQ (Z) AS A FUNCTION OF CORE HEIGHT PAGE 9 of 14

COLR for VEGP UNIT 2 CYCLE 12 120

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

UNACCEPTABLE UNACCEPTABLE h

k n

6

- 80 -

t Q) c 3 60 ACCEPTABLE IC 0

C, C

e! (-50, 50) (+26,50) w W

B 40 s

g 20 0

-50 -40 -30 -20 -10 0 10 20 30 40 50 AXIAL FLUX DIFFERENCE (percent AI)

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

COLR for VEGP UNIT 2 CYCLE 12 Axial Elevation BOL Point 1

2 211.80 3  %

1.0000 3 11.60 1.0000 4 11.40 1.0000 5 11.20 1.0000 Core Height - feet TMs figure is referred to by SpeetRQtion BL2.1 Tbese W(Z) values are consistent wW Figure 5, and are valid over the HFP Tw temperature range from 586.4 tn 587.4OF.

Top and Bottom 15% Erduded per Technical Spedficatlon B1.2.1 FIGURE 6 RAOC W (Z) AT 150 MWDIMTU PAGE 11 of 14

COLR for VEGP UNIT 2 CYCLE 12 Axial Elevation MOL-1 P m (feet) W(z) 1 12.00 1.0000 2 11.80 1.0000 Core Height - f e e t This figure I s referred to by Specification B3.21 These W(Z) valuer are wndstent wtth Flgure 5, and are valld over the HFP Tq temperature range from 586.4 to 587.4OF.

Top and Bottom 15% Excluded per Technical Speclficatlon B3.2.1 FIGURE 7 PAGE 12 of 14 RAOC W (2)AT 4000 MWDIMTU

COLR for VEGP UNIT 2 CYCLE 12 Axial Point 1

2 3

0.0 2.0 4.0 6.0 8.0 10.0 12.

Core Height - f e e t This Rgure is referred to by SpeeWcaUon B3.2.1 These W(2) values are w n d s t a wtth Figure 5, and are valld over tbe HFP Taw temperature range from 586.4 to 58'7.4OF.

Top and Bottom 15% Excluded per Technical SpedRcatlon B3.2.1 FIGURE 8 RAOC W (Z) AT 12000 MWDIMTU PAGE 13 of 14

COLR for VEGP UNIT 2 CYCLE 12 Axial EOL wo 1.0000 1 .moo Core Height - feet TYs figure Is mierred to by Speelflcatbn B3.2.1 T b W@) values are conslsteat wtth Flgure 5, and are valld over the HFP Tw temperature range from 586.4 to S87.4OF'.

• Top and Bottom 15% Excluded per Technical Spedacation B3.2.1 FIGURE 9 RAOC W (2)AT 20000 MWDIMTU PAGE 14 of 14