ML20012E014

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Cycle 3 Core Operating Limits Rept.
ML20012E014
Person / Time
Site: Vogtle Southern Nuclear icon.png
Issue date: 03/22/1990
From:
GEORGIA POWER CO.
To:
Shared Package
ML20012E012 List:
References
NUDOCS 9003290215
Download: ML20012E014 (10)
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Text

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ENCLOSURE 4 FOR UNIT 1 s

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V0GTLE ELECTRIC GENERATING PLANT (VEGP) UNIT 1 CYCLE 3  ;

CORE OPERATING LIMITS REPORT t 9

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i COLR for VEGP UNIT 1 CYCLE 3 l i

1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Re> ort (COLR) for VEGP UNIT 1 CYCLE 3 has been prepared in accordance with tie requirements of Technical Specification 6.8.1.6 The Technical Specifications affected by this report are listed below:

3/4.1.1.1 SHUTDOWN MARGIN - MODES 1 and 2 3/4.1.1.2 SHUTDOWN MARGIN - MODES 3, 4 and 5 3/4.1.1.3 Moderator Temperature Coefficient  ;

3/4.1.3.5 Shutdown Rod Insertion Limit '

3/4.1.3.6 Control Rod Insertion Limits 3/4.2.1 Axial Flux Difference 3/4.2.2 Heat Flux Hot Channel Factor - FQ(Z)

N 3/4.2.3 Nuclear Enthalpy Rise Hot Channel factor - F4H t

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i COLR for VEGP UNIT 1 CYCLE 3 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 the NRC-approved methodologies specified in Technical Specificatior 6.8.1.6 2.1 SHUTDOWN MARGIN - MODES 1 AND 2 (Specification 3/4.1.1.1) 2.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.3% Ak/k.

2.2 filyTDOWN MARGIN - MODES 3. 4 AND 5 (Specification 3/4.1.1.2)

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

2.3 Moderator Temperature Coefficient (Specification 3/4.1.1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) limits are:

The BOL/AR0/HZP - MTC shall be less positive than +0.7 x 10-4 A k/kOF for power levels up to 70% RTP with a linear ramp to 06k/k/0F at 100% RTP.

The E0L/AR0/RTP-MTC shall be less negative than -4.0 x 10-4 4 k/k/0F, 2.3.2 The MTC Surveil 1&nce limit is:

The 300 ppm /AR0/RTP-MTC should be less negative.than or equal to

-3.1 x 10- 4k/k/0F. .

where: BOL stands for Begfn'n'ing of Cycle Life ARO stands for All Rods Out HZP stands for Hot Zero THERMAL POWER E0L stands for End of Cycle Life RTP stands for RATED THERMAL POWER

.o COLR for VEGP UNIT 1 CYCLE 3 2.4 Shutdown Rod Insertion limit (Specification 3/4.1.3.5) 2.4.1 The shutdown rods shall be withdrawn to a position greater than or equal-to 222 steps.

2.5 Control Rod Insertion Limits (Specification 3/4.1.3.6) 2.5.1 The control rod banks shall be limited in physical insertion as shown in Figure 3.

2.6 Axial Flux Difference (Specification 3/4.2.1)

(CAOC methodology) 2.6.1 The AXIAL FLUX DIFFERENCE (AFD) target band is +5%, -5% for core average accumulated burnup <3000 MWD /MTU.

2.6.2 The AFD target band is +3%, -12% for core average accumulated burnup >3000 MWD /MTU.

where: MWD /MTV stands for megawatt days / metric ton of initial uranium metal.

2.6.3 The AFD Acceptable Operation Limits are provided in Figure 4.

2.7 Heat Flux Hot Channel Factor - FQ(Z) (Specification 3/4.2.2)

{Fxy methodology)

RTP FQ 2.7.1 FQ (Z) s

  • K(Z) for P > 0.5 P

RTP FQ (Z) s

  • K(Z) for P s 0.5

0.5 where

P - THERMAL POWER RATED THERMAL POWER RTP 2.7.2 FQ = 2.30 1

4 m______ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ . _ _ _ _ . _ _ _ _ _ _ . _ . - _ . - -_ .-_--____-__-___.._________________-______________._________.-___._.m.__._..m__..______.__._______._.___.

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COLR for VEGP UNIT 1 CYCLE 3 I

l 2.7.3 K(Z) is provided in Figure 5. l L RTP  ;

Fxy - fxy * (1 + PFxy * (1-P)) ]

RTP

2.7.4 where

1. Fxy is less than or equal to 1.775 for all core )

planes containing Bank "D" control rods i

2. For all unrodded core planes:

RTP Fxy is less than or equal to 1.705 for core elevations below 3.7 ft.

, RTP Fxy is less than or equal to 1.660 for core ,

elevations between 3.7 ft. and 8.1 ft.

t RTP Fxy is less than or equal to 1.765 for core elevations above 8.1 ft.  !

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2.7.5 PFxy = 0.2 2.8 Nuclear Enthalov Rise Hot Channel Factor - FjH (Specification 3/4.2.3) ,

RTP ,

2.8.1 FjHsFaH * (1 + Pfa H * (1-P)) -

c where: P = THERMAL POWER RATED THERMAL POWER RTP .

2.8.2 FAH = 1.55  ;

2.8.3 PFAH = 0.3 3 l

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L o 6 COLR FOR VEGP UNIT 1 CYCLE 3 1

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0 20 40 60 80 100 RELATIVE POWER (PERCENT)

FIGURE 3 ROD BANK INSERTION LIMITS VERSUS THERMAL POWER

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,a-. .,,_,-,,,en,.,,.,--~ - - . _ , . _ . _ , , . . - ,

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FLUX DIFFERENCE, Al (percent) .

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AxlAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF RATED THERMAL POWER

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k COLR FOR VEGP UNIT l CYCLE 3  !

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HEIGHT K(Z) 0.000 1.000 6.000 1.000 [

0.25 10.835 0.939  ;

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

t flGURE 5 i K(Z) - NORMAll2ED F (Z) Q AS A FUNCTION OF CORE HEIGHT

. - . . . . - - . , . . - . . _ . . . . . . - . . - - . . . . . - - ~ - . . . - _ . - . . -

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