ML20094G379

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Cycle Colr
ML20094G379
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 10/27/1995
From:
HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20094G377 List:
References
NUDOCS 9511130011
Download: ML20094G379 (9)
v • d • e


Text

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, hg SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 l

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l SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION  !

i UNIT 2 CYCLE 5 CORE OPERATING LIMITS REPORT I

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October 1995 1

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1 Core Operating Limits Report Page 1 of 9 10A1/95 l

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g SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 i CORE OPERATING LIMITS REPORT His Core Operating Limits Repon for STPEGS Unit 2 Cycle 5 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.  ;

He Technical Specifications affected by this report are:

!) 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 Insenion 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 MODERATOR 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 He EOL, ARO, HFP, MTC shall be less negative than -6.12 x 10d Ak/k/ *F.

2.1.3 The 300 ppm, ARO, HFP, MTC shall be less negative than -5.22 x 104 Ak/k/*F (300 ppm Surveillance Limit).

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

HFP vessel average temperature is 589 *F l Core Operating Limits Report Page 2 of 9 10/D/95 Rev Ocember 26. 1995 18.58 em

e h SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 2.2 ROD INSERTION LIMITS (Specification 3.1.3.5 and 3.1.3.6) 2.2.1 He Control Rod Insertion limits are provided in Figure 2.

2.2.2 Fully withdrawn for all Control and Shutdown Banks shall be at least 250 steps withdrawn but not exceeding 259 steps withdrawn.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 ACCEFTABLE OPERATION portion of Figure 3, as required by Technical Specifications.

2.4 HEAT FLUX HOT CHANNEL FACTOR (Specification 3.2.2) 2.4.1 Fn "T'= 2.~/0.

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 2.102 for all core planes containing Bank "D" control rods, and 2.4.3.2 L.ss than or equal to the appropriate core height-dependent value from Table I for all unrodded core planes.

2.4.3.3 PF,, = 0.2.

Core Operating Limits Report Page 3 of 9 10/22/95 Rev Ocanbar 26. 1995 II:58 ase

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The SOUTH TEXAS UNIT 2 CYCLE 5 OCFOBER 1995 These F,, limits were used to confirm that the heat flux hot channel factor Fo (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, I including the accompanying variations in the axial xenon and power distributions, as described in WCAP-8385. Therefore, 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) i Standard Fuel VANTAGE SH Fuel 2.5.1 Fas""= 1.49. Fas""= 1.557.

2.5.2 PF 3s =0.3. PF3s = 0.3. l 3 REFERENCES 3.1 Correspondence Serial Number ST-UB-HL-1518, Letter from Robert C. Cobb (Westingbouse) to Dave Hoppes (HL&P), Core Operating Limits Report, Unit 2 Cycle 5,10-26-95 3.2 NUREG-1346, Technical Specifications, South Texas Project Unit Nos. I and 2.

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f Core Operating Limits Report Page 4 of 9 10/11/95 Rev Ocamber 26, IW5 3 06 pas e

O N SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 w FIGURE 1 MTC versus Power Level 70 -

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Core Operating Limits Report Page 5 of 9 10h1/95 a % 25. ms 4m ,.

The SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 FIGURE 2 Control Rod Insertion Limits

  • Versus Power Level (23.259t 122 Step Overlap (79.259r 122 Step Overiao (23.258L 121 Step Overlap (79.258t 121 Step Overiao (22.256t 119 Step Overlap (78.256t 119 Step Overlap (21.254t 117 Step Overlap (77.254t 117 Step Overlao 260 , , (20.252t 115 Step Overlap (76.252t 115 Step Overlap

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Control Bank A is already withdrewa to Full Out Position. Fully withdrawn region shall be the condition where shutdown and control t, ants are at a position within the interval of ?_250 and _<259 _

steps withdrawn. inclusive.

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Core Operating Limits Report Page 6 of 9 10/zV95 Rev October 25, 1995 4:13 pu d

m SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 FIGURE 3 AFD Limits versus Rated Thermal Power 120 100 i-11,90 11,90 UNACCEPTABLE / UNACCEPTABLE OPERATION

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-50 -40 -30 -20 -10 0 10 20 Flu Olfference (&l) 1 Core Operating Limits Report Page 7 of 9 10A?/95 Re= S* der 25, 1995 4-08 pun

I N SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 l

FIGURE 4 K(Z) - Normalized Fn(Z) versus Core IIeight l W

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Z 52 o.s Core Elevation FQ K(z) w -

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1 Core Operating Limits Report Page 8 of 9 10/2V95 m m 25. m s .os m

O N SOUTH TEXAS UNIT 2 CYCLE 5 OCTOBER 1995 W

Table 1 Unrodded Fxy for Each Core Height Core Height Unrodded Core Height Unrodded (Ft.) Fxy (Ft.) Exy 0.000 2.061 7.200 1.973 0.200 2.014 7.400 1.977 0.400 1.%7 7.600 1.981 0.600 1.920 7.800 1.984 0.800 1.878 8.000 1.988 1.000 1.845 8.200 1.991 1.200 1.823 8.400 1.994 '

1.400 1.811 8.600 1.995 l.600 1.809 8.800 1.993 l.800 1.824 9.000 1.993 2.000 1.838 9.200 1.995 2.200 1.850 9.400 1.999 2.400 1.858 9.600 1.999 2.600 1.859 9.800 1.993 2.800 1.869 10.000 1.978 3.000 1.878 10.200 1.963 3.200 1.879 10.400 1.947 3.400 1.876 10.600 1.932 3.600 1.874 10.800 1.917 3.800 1.893 11.000 1.904 4.000 1.902 11.200 1.891 4.200 1.905 11.400 1.879 4.400 1.909 11.600 1.861 4.600 1.914 11.800 1.856 4.800 (

1.919 12.000 1.850 i 5.000 1.924 12.200 1.845 5.200 1.928 12.400 1.842 5.400 1.932 12.600 1.861 ,

5.600 1.937 12.800 1.893 5.800 1.941 13.000 1.938 6.000 1.945 13.200 2.004 6.200 1.949 13.400 2.079 6.400 1.954 13.600 2.162 6.600 1.959 13.800 2.241 6.800 1.%3 14.000 2.319 i 7.000 1.%8 '

t Core Operating Limits Report Page 9 of 9 10/rN95 tew Osseber 26. 1995 913 mm

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