ML20091L003

South Tx Project Electric Generating Station,Unit 1 Cycle 6,COLR

ML20091L003
Person / Time
Site:	South Texas
Issue date:	04/30/1995
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20091K987	List: ML20091L003 ST-HL-AE-5151, Forwards South Tx Project Electric Generating Station, Unit 1 Cycle 6,COLR
References
NUDOCS 9508280259
Download: ML20091L003 (19)

Text

_- .. - - . . . . . .

' The .SOLTTH TEXAS UNrr 1 CYCLE 6 APRIL 1995 3 i

e SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION UNIT 1 CYCLE 6 -'

CORE OPERATING LIMITS REPORT  :

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April 1995 ,

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Core Operating Limits Report Page 1 of 9 4/ /95 Rev April 5,1995. 447 pun 9508280259 950823 E-PDR ADOCK 05000498 #

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a mu hts Sottni TEXAS UNrr 1 CYCLE 6 APRll 1995 [

J CORE OPERATING LIMITS REPORT

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This Core Operating Limits Report for STPEGS Unit 1 Cycle 6 has been prepared in accordance with the requirements of Technical Specification 6.9.1.6. The core operating limits have been developed using the NRC approved methodologies specified in Technical Specification 6.9.1.6.

! The Technical Specifications affected by this report are:

1) 3/4.1.1.3 Moderator Temperature Coefficient Limits

. 2) 3/4.1.3.5 Shutdown Rod lasertion Limit

- 3) 3/4.1.3.6 Control Rod lasertion Limits 4

4) 3/4.2.1 AFD Limits

5) 3/4.2.2 Heat Flux Hot Channel Factor

6) 3/4.2.3 Nuclear Enthalpy Rise Hot Channel Factor 2 OPERATING LIMITS

!' He cycle-specific parameter limits for the specifications listed in Section 1.0 are presented below.

1 2.1 MODERATOR TEMPERATURE COEFFICIENT (Specification 3.1.1.3)

I l 2.1.1 He BOL. ARO, MTC shall be less positive than the limits shown in Figure 1.

i 4

! 2.1.2 De EOL, ARO, HFP, MTC sha!! be less negative than -6.12 x 10 Ak/k/*F.

I i

4 l 2.1.3 De 300 ppm, ARO, HFP, MTC shall be less negative than -5.22 x 10 Ak/k/*F (300 ppm Surveillance Limit).

l Where: BOL stands for Beginning-of-Cycle Life EOL stands for End-of-Cycle Life j ARO stands for All Rods Out HFP stands for Hot Full Power (100% RATED THERMAL POWER) '

' HFP vessel average temperature is 539 "F

Core Operating Limits Report Page 2 of 9 4/ /95 l

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4

.' The SOtrrH TEXAS UNrr i CYCLE 6 APRIL 1995 3 2.2 ROD INSERTION LIMITS (Specification 3.1.3.5 and 3.1.3.6) 2.2.1 The Control Rod lasertion limits are provided in Figure 2.

2.2.2 Fully withdrawn for all Control and Shutdown Banks shall be at least 249 steps withdrawn but not exceeding 259 steps withdrawn.

2.2.3 All banks shall have the same Full Out Position (FOP).

2.3 AXIAL FLUX DIFFERENCE (Specification 3.2.1) 2.3.1 AFD limits as required by Technical Specification 3.2.1 are determined by CAOC Operations with an AFD target band of +3,-12%.

2.3.2 The AFD shall be maintained within the ACCEPTABLE OPERATION portion of Figure 3, as required by Technical Specifications.

2.4 HEAT FLUX HOT CHANNEL FACTOR (Specification 3.2.2) 2.4.1 Fq*=2.70.

2.4.2 K(Z) is provided in Figure 4.

2.4.3 The F,y limits for RATED THERMAL POWER (F,y9 within specific core planes shall be:

1 2.4.3.1 less than or equal to 2.102 for all core planes containing Bank "D" control rods, and l

2.4.3.2 less than or equal to the appropriate core height dependent value from l Table I for all unrodded core planes. l l

2.4.3.3 PF,y = 0.2.

Core Operating Limits Report Page 3 of 9 4/ /95 1

4tev April 6,199$ 1:34 pm l

Tghay SotrrH TEXAS UNrr i CYCLE 6 APRIL 1995 3 These F,y limits were used to confirm that the heat flux hot channel factor F 9 (z) will be limited by Technica! Specification 3.2.2 assuming the most-limiting axial power distributions expected to result for the insertion and removal of Control Banks C and D during operation, including the accompanying variations in the axial xenon and power distributions, as described in WCAP-8385. Herefore, these F,y limits provide assurance that the initial conditions assumed in the LOCA analysis are met, along with the ECCS acceptance criteria of 10CFR50.46.

2.5 ENTHALPY RISE HOT CHANNEL FACTOR (Specification 3.2.3)

Standard Fuel VANTAGE SH Fuel 2.5.1 F 3nRW, g ,49, pAH = 1.557, 2.5.2 PF3g =0.3, PF3 a=0.3.

3 REFERcNCES 3.1 Correspondence Serial Number ST-UB-HL-1458, Letter from Robert C. Cobb (Westinghouse) to Dave Hoppes (HL&P), Core Operating Limits Report, Unit 1 Cycle 6,4-6-95.

)

3.2 NUREG-1346, Technical Specifications, South Texas Project Unit Nos. I and 2.

3.3 Correspondence Serial Number ST-WN-HS-940275, Letter from Mary Ann Sinwell (Westqihame) l to D. A. Leazar (HL&P), Accumulator Water JCO, 8-9-94 Core Operating Limits Report Page 4 of 9 4/ /95 Rev Apru $,1993 4 07 pm

N U ght SotrTH TEXAS UMT l CYCLE 6

• • =9a=7 APPJL 1995 W-FIGURE 1 MTC versus Power IAvel 7'0 F9%

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Core Operating Limits Report Page 5 of 9 4/ /95 a- %.6 a ms sw ,

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mgy Sotml TEXAS UNrr ! CYC1.E 6 APRIL 1995 3 FIGURE 2 ,

Control Rod Insertion Limits

• Versus Power Level (23,2599: 122 Sees overtes 179.2591: 122 Stes Oveep (22.2571: 120 Stoo Overtes 178,257): 120 Stee ovees 121,2556: 118 Sees overtes (77,2551: 118 Stoo overteo (21,253): 116 Stes Ovees 177.2531: 116 Stoo overtes 260 -' (20,2518: 114 Stoo overtes '

, r l ,lf 478,2511: 1 t o Steo ovees

. >, . f (19,249): 112 Stoo Overtes I i.r; (75,2491: 112 Stoo overtes 240 ff , ,[

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mararIVE POWER N I

• Comrol Bank A is already withdrawn to Fuu Out Position. Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of1249 and f.259 steps withdrawn, inclusive.

Core Operating Limits Report Page 6 of 9 4/ /95 a., w w. im e n ,

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s Sotnu TEXAS UNrr 1 CYCLE 6 kemy APRIL 1995 W ==

i FIGURE 3

{ AFD Limits versus Rated Thermal Power i

i 120 4

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Core Operating Limits Report Page 7 of 9 4/ /95 m u.,a m. m sm l

mgy Sottrit TEXAS UNrr ! CYCLE 6 APRIL 1995 3 FIGURE 4 K(Z) - Normalized F9(Z) sessus Core IIeight W

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Z 520.s Core Elevation FQ K(z) m -

0.0 ft 2.70 1.0 o_

a 0.4 7.0 ft 2.70 1.0 W _ 14.0 ft 2.498 0.925 Ed k0.2 1

T O o Z 0 2 4 6 8 10 12 14 16 CORE HEIGHT (FT) )

l i 1 Core Operating Limits Report Page 8 of 9 4/ /95 a- %6m.im sm ,

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l Ng SotrTH TEXAS UNrr 1 CYCLE 6 APRIL 1995 [

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. j Table 1 l Unrodded Fxy for Each Core IIcight Core Height Unrodded Core Height Unrodded (Ft.) Fxy (Ft.) Exy 0.000 1.927 7.200 1.973 0.200 1.899 7.400 1.970 0.400 1.871 7.600 1.966 i 0.600 1.847 7.800 1.%3 O.800 1.823 8.000 1.960 1.000 1.799 8.200 1.957 1.200 1.779 8.400- 1.953 1.400 1.770 8.600 1.947 1.600 1.775 '8.800 1.940 1.800 1.800 9.000 1.935 2.000 1.825 9.200 1.930 2.200 1.8d S 9.400 1.926 ,

2.400 1.861 9.600 1.927 2.600 1.871 9.800 1.917 2.800 1.875 10.000 1.912 3.000 1.878 10.200 1.906 3.200 1.871 10.400 1.899 3.400 1.865 10.600 1.891 3.600 1.858 10.800 1.883 3.800 1.855 11.000 1.874 4.000 1.851 11.200 1.865 4.200 1.849 11.400 1.862 4.400 1.853 11.600 1.865 4.600 1.870 11.800 1.878 4.800 1.887 12.000 1.890 ,

5.000 1.903 12.200 1.901 5.200 1.920 12.400 1.909 5.400 1.939 12.600 1.915 5.600 1.957 12.800 1.906 5.800 1.974 13.000 1.900 6.000 1.989 13.200 1.957 6.200 1.992 13.400 2.035 l 6.400 1.989 13.600 2.122 6.600 1.985 13.800 2.227 6.800 1.980 14.000 2.331 7.000 1.976 e

Core Operating Limits Report Page 9 of 9 4/ /95 a.. va s. m3 .

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J The - SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 :

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SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION.  ;

UNIT 2 CYCLE 4 CORE OPERATING LIMITS REPORT, l

March 1995

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Page 1 of 10 3/ /95  ;

Core Operating Limits Report l na m u. sm wu -

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, Ng SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 g 1 CORE OPERATING LIMITS REPORT This Core Operating Limits Report for STPEGS Unit 2 Cycle 4 has been prepared in accordance with the requirements of Technical Specification 6.9.1.6. The core operating limits have been developed using the NRC-approved methodologies specified in Technical Specification 6.9.1.6.

The Technical Specifications affected by this report are:

1) 3/4.1.1.3 Moderator Temperature Coefficient Limits

2) 3/4.1.3.5 Shutdown Rod Insertion Limit

3) 3/4.1.3.6- Control Rod insertion Limits

4) 3/4.2.1 AFD Limits

5) 3/4.2.2 Heat Flux Hot Channel Factor

6) 3/4.2.3 Nuclear Enthalpy Rise Hot Channel Factor 2 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented below.

2.1 MODER ATOR TEMPERATURE COEFFICIENT (Specification 3.1.1.3) 2.1.1 The BOL, ARO, MTC shall be less positive than the limits shown in Figure 1.

2.1.2 The EOL, ARO, HFP, MTC shall be less negative than -6.3 x 104 Ak/k/*F.

2.1.3 The 300 ppm, ARO, HFP, MTC shall be less negative than -5.4 x 104 Ak/k/'F (300 ppm Surveillance Limit).

Where: BOL stands for Beginning-of-Cycle Life f

EOL stands for Endef-Cycle Life ARO stands for All Rods Out HFP stands for Hot Full Power (100% RATED THERMAL POWER)

Core Operating Limits Report Page 2 of 10 3/ /95 Rev March 14. tw$ 414 pm

The SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 2.2 ROD INSERTION LIMITS (Specification 3.1.3.5 and 3.1.3.6) 2.2.1 The Control Rod Insertion limits are provided in Figure 2.

2.2.2 Fully withdrawn for all Control and Shutdown Banks shall be at least 249 steps withdrawn but not exceeding 259 steps withdrawn.

2.2.3 All banks shall have the same Full Out Position (FOP).

2.3 - AXIAL FLUX DIFFERENCE (Specification 3.2.1) 2.3.1 AFD limits as required by Technical Specification 3.2.1 are determined by CAOC Operations with an AFD target band of +3, -12%.

2.3.2 The AFD shall be maintained within the ACCEPTABLE OPERATION portion of Figure 3, as required by Technical Specifications.

2.4 HEAT FLUX HOT CHANNEL FACTOR (Specification 3.2.2) 2.4.1 Fo""=2.50.

2.4.2 K(Z) is provided in Figure 4.

2.4.3 The F, limits for RATED THERMAL POWER (F "") y within specific core planes shall be:

2.4.3.1 less than or equal to 1.946 for all core planes containing Bank "D"

~

control rods, and 2.4.3.2 less than or equal to the appropriate core height-dependent value from i Table i for all unrodded core planes.

2.4.3.3 PFy =0.2.

Core Operating Limits Report Page 3 of 10 3/ /95 l l

no m a i4.iws 4.i4 ,.

N SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 i

These Fy limits were used to confirm that the heat flux hot channel factor Fn(z) will be limited by Technical Specification 3.2.2 assuming the most-limiting axial power distributions expected to result for the insertion and removal of Control Banks C and D during operation, including the accompanying variations in the axial xenon and power distributions, as described in WCAP-8385. Therefore, these Fy limits provide assurance that the initial conditions assumed in the LOCA analysis are met, along with the ECCS acceptance criteria of 10CFR50.46.

2.5 ENTH ALPY RISE HOT CH ANNEL FACTOR (Specification 3.2.3) 2.5. I F,u""= 1.46.

2.5.2 PFin=0.3.

3 REFERENCES 3.1 Correspondence Serial Number ST-UB-HL-1446, Letter from Robert C. Cobb (Westinghouse) to Dave Hoppes (HL&P), Core Operating Limits Report, Unit 2,Mid-Cycle 4, 3-15-95, 3.2 NUREG-1346, Technical Specifications, South Texas Project Unit Nos. I and 2.

1 i

O Page 4 of 10 3/ /95 Core Operating Limits Report Rev March 14,1991 4.14 pie

.. . . . . .. - . . . ..- . = _ . _ - . - . . . - _ - - - . . . . . . . . . - - . - - . . . - . . . = . - .-

1.

The SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 i

i FIGURE 1 i

! MTC versus Power level i 5 I

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1 1 UNACCEPTABLE OPERATION e

i j 0 I o ACCEPTABLE OPERATION 9 -

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• i 0 20 40 60 80 100

Relative Power (%)

Core Operating Limits Report Page 5 of 10 3/ /95 Rev Man;h 14, lWS 4 14 pa

The SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 FIGURE 2 Control Rod Insertion Limits

• Versus Power byel (23,2591: 122 Ste overtes (79.2591: 122 Step Overts (22,2571: 120 Stas Overtes (78.2571: 120 Step Overtes (21,2551: 118 Stoo Overtes 177,255): 118 Stoo overte

• 121,253): 116 stas overts (77,2531: 116 Stoo overteo 260

, ., v' (20,251)

114 Stoo overtes p' 176,2511: 114 Ste overtes i  ! ,1 (19,2499: 112 Ste Overtes fi (75,2491: 112 Step overte 240 f '

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i ,F 40 r y

F 20 ,

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0 0 10 20 30 40 50 50 70 80 90 100 RELATIVE POWER (%)

' Comeet Bank A la ebeady wishdrews is Fell Out Posities Fully withdraws regios shall be the condition where shutdows and consol heeks are as a ponieson withis the inwreal of 3 ,240 sed1259 seeps withdrews,incimeive.

Core Operating Limits Report Page 6 of 10 3/ /95 i

Rev Apnl X 19e4 1947 mm

1 MARCH 1995 T gho,e SOUTH TEXAS UNIT 2 MID-CYCLE 4 i

FIGURE 3 1

AFD Limits versus Rated Thermal Power i 120 i >

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i 100

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.' j -. 1-11,90 11,90 l l UNACCEPTABLE UNACCEPTABLE!

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0 -10 0 10 20 30 40 50

-50 -40 -30 -20 FlusDifference(Al)I l

Page 7 of 10 3/ /95 Core Operating Limits Report 1

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m SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 I .

I FIGURE 4 i j K(Z) - Normalized F n(Z) versus Core Height 4

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Page 8 of 10 3/ /95 Core Operating Limits Report i

' Rev 0645M 3 copas

The SOUTH TEXAS UNIT 2 MID-CYCLE 4 MARCH 1995 g Table 1 (Part 1 of 2) 3 Unrodded Fxy for Each Core Height for Burnups from BOC to 10,000 MWD /MTU Core Height Unrodded Core Height Unrodded (Ft.) Fxy (Ft.) Fxy 0.000 4.668 7.200 1.752 0.200 3.219 7.400 1.739 0.400 2.506 7.600 1.726 0.600 2.138 7.800 1.717 0.800 1.950 8.000 1.709 1.000 1.841 8.200 1.704 1.200 1.778 8.400 1.699 1.400 1.744 8.600 1.695 1.600 1.729 8.800 1.692 1.800 1.723 9.000 1.691 2.000 1.730 9.200 1.692 2.200 1.736 9.400 1.695 2.400 1.743 9.600 1.698 2.600 1.754 9.800 1.705 2.800 1.772 10.000 1.710 3.000 1.7vi 10.200 1.714 3.200 1.809 10.400 1.719 3.400 1.824 10.600 1.727 3.600 1.833 10.800 1.735 3.800 1.839 11.000 1.745 4.000 1.840 11.200 1.753 4.200 1.835 11.400 1.758 4.400 1.825 11.600 1.768 4.600 1.815 11.800 1.784 4.800 1.806 12.000 1.806 5.000 1.799 12.200 1.832 5.200 1.793 12.400 1.863 5.400 1.788 12.600 1.897 5.600 1.784 12.800 1.943 5.800 1.781 13.000 2.019 6.000 1.778 13.200 2.062 6.200 1.778 13.400 2.193 6.400 1.779 13.600 2.501 6.600 1.780 13.800 3.233 6.800 1.782 14.000 4.328 7.000 1.768 Core Operating Limits Report Page 9 of 10 3/ /95 Rev December 6.194 3.$8 pm

N SOUTH TEXAS UNIT 2 MID-CYCLE 4 MAPCH 1995 Table 1 (Part 2 of 2)

Unrodded Fxy for Each Core Height for Burnups from 10,000 MWD /MTU tc EOC Core Height Unrodded Core He ght Unrodded (Ft.) Fxy (1 t.) Fxy 0.000 3.579 7.200 2.008 0.200 2.540 7.400 2.004 0.400 2.057 7.600 2.001 0.600 1.814 7.800 2.001 0.800 1.699 8.000 2.001 1.000 1.640 8.200 2.000 1.200 1.618 8.400 2.000 1.400 1.616 - 8.600 2.013 1.600 1.628 8.800 2.024 1.800 1.647 9.000 2.035 2.000 1.674 9.200 2.041 2.200 1.702 9.400 2.037 2.400 1.731 9.600 2.028 2.600 1.762 9.800 2.007 2.800 1.795 10.000 1.986 3.000 1.828 10.200 1.964 3.200 1.861 L 1.400 1.942 3.400 1.891 10.600 1.921 3.600 1.918 10.800 1.900 3.800 1.935 11.000 1.880 4.000 1.942 11.200 1.863 4.200 1.954 11.400 1.850 4.400 1.970 11.600 1.840 4.600 1.980 11.800 1.835 4.800 1.985 12.000 1.820 5.000 1.994 12.200 1.801 5.200 2.004 12.400 1.795 5.400 2.006 12.600 1.800 5.600 2.003 12.800 1.828 5.800 2.006 13.000 1.890 6.000 2.011 13.200 1.901 6.200 2.020 13.400 1.972 6.400 2.029 13.600 2.168 6.600 2.024 13.800 2.696 6.800 2.018 14.000 3.461 7.000 2.013 .

Core Operating Limits Report Page 10 of 10 3/ /95 Rev Daember 6.1994 3.58 pm