ML20137C591

STP Unit 2 Cycle 6 Colr

ML20137C591
Person / Time
Site:	South Texas
Issue date:	02/28/1997
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20137C590	List: ML20137C591 ST-HL-AE-5604, Forwards STP Unit 2 Cycle 6 Colr
References
NUDOCS 9703250052
Download: ML20137C591 (10)

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South Texas Project Electric Generating Station Unit 2 Cycle 6 Core Operating Limits Report i

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i February 1997 l

9703250052 970317 PDR ADOCK 05000499 p PDR Core Operating Limits lieport Page 1 of 10 02/19/97

'h'hs Light SOUTil TEXAS UNIT 2 CYCLE 6 FEDRUARY 1997

. c.-mpany 1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report for STPEGS Unit 2 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 Tec'hnical 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 LIMITS-

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 2.0 OPERATING LIMITS The 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) 2.1.1 The BOL, ARO, MTC shall be less positive than the limits shown in Figure L 2.1.2 The EOL. ARO, HFP, MTC shall be less negative than -6.12 x 104 Ak/k/* F.

2.1.3 The 300 ppm, ARO, HFP, MTC shall be less negative than -5.22 x 10" Ak/k/*F

-(300 ppm Surveillance Limit).

Where: BOL stands for Beginning-of-Cycle Life EOL stands for End-of-Cycle Life l

ARO stands for All Rods Out HFP stands for Hot Full Power (100% RATED THERMAL POWER)

HFP vessel average temperature is 589 F 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2.2.2 Fully withdrawn for all Control and Shutdown Banks shall be at least 249 steps withdrawn but not exceeding 259 steps withdrawn.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).

Core Operating Limits Repon Page 2 of 10 02/19/97

The Llyht SollTil TEXAS UNIT 2 CYCLE 6 FEBRUARY 1997 c:mpany 2.3 AXl AL 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"T" - 1 70.

2.4.2 K(Z) is provided in Figure 4.

2.4.3 The F,, limits for RATED THERMAL POWER (F,,"T") 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 Less 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.

These F,3 limits were used to confirm that the heat Hux hot channel factor nF (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 F,, limits provide assurance that the initial conditions assumed in the LOCA analysis are met along with the ECCS acceptance criteria of 10 CFR 50.46.

2.5 ENTHALPY RISE HOT CHANNEL FACTOR (Specification 3.2.3)

Standard Fuel VANTAGE SH Fuel 2.5.1 Fu,"'" = 1.49, FnRTP a = 1.557.

2.5.2 PF3 n = 0.3. PFan = 0.3.

Core Operatmg Limits Report Page 3 of 10 02/19/97 l

M7M M D n % M 6 M lMEY T/ M d N O I N bYk N h N 4

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The Light Sotml TEXAS UNrr 2 CYCLE 6 FEBRUARY 1997

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3.0 REFERENCES

l 3.1 Correspondence Serial Number ST-UB-IIL-1685, Letter from R. M. Bell (Westinghouse) to Dave 11oppes (llL&P), Core Operating Limits Report, Unit 2 Cycle 6,2-17-97 3.2 NUREG-1346, Technical Specifications, South Texas Project Unit Nos. I and 2.

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l Core Operating Limits Report Page 4 of 10 2/19/97

Thk Llyht SOUTit TEXAS UNIT 2 CYC1.E 6 compsy FEBRUARY 1997 w Figure 1 MTC versus Power Level 1 7.0 ~ :n

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Core Operating Umits Report Page 5 of 10 02/19/97

The Licht SOUT11 TEXAS UNIT 2 CYCLE 6 FEBRU ARY 1997

• CSHE Y r- Figure 2 Control Rod insertion Limits

• versus Power Level t

i I (23,259): 122 Step overlap (22,257): 120 Step overlap 260 ,e (21,255): 118 Step overlap ,e r (21,253): 116 Step overlap /

,[_ (20,251): 114 Step overlap /

240 g (19,249): 112 Step overlap .-pd .

/ / (79,259): 122 Step overlap

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/ (78,257): 120 step overlap 220

/ iBANK 3 i ,

r (77,255): 118 step overlap

,/ / (77,253): 116 Step overlap l

/ 2 (76,251): 114 step overlap

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j / (75,249)

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Control Bank A is already withdrawn to Full Out Position. Fully withdrawn region shall be the condition where l shutdown and control banks are at a position within the interval of 2 249 and s 259 steps withdrawn, inclusise.

l Core Operating Limits Report Page 6 of 10 02/19 97

. a m L1 h,t SOUTH TEXAS UNrr 2 CYCLE 6 FEBRUARY 1997 {

Figure 3 AFD Limits versus Rated Thermal Power 120 100

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-50 -40 -30 -20 -10 0 10 20 30 40 50 FlusOlfference(Al)1 Core Operating Limits Report Page 7 of 10 02/19/97 l

ngLI h,t SOUTil TEXAS UNIT 2 CYCLE 6 FEBRUARY 1997 Figure 4 K(Z) - Normalized Fn(Z) versus Core IIeight W

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Core Operating Limits Report Page 8 of 10 02/19/97 I

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• Tha Light SOUT11 TEXAS UNIT 2 CYCLE 6 FEBRUARY 1997 j ,

CJmPany .

I Table 1 (Part I of 2)

Unrodded F,, for Each Core IIcight i For Burimps from BOC to 10,000 MWD /MTU i

5 Core Height Unrodded Core lleight Unrodded (Ft.) F.,_ (Ft.) F_ y 14.000 4.140 6.800 1.886 l 13.800 3.671 6.600 1.872

{

. 13.600 3.201 6.400 1.862 13.400 2.731 6.200 1.854 13.200 2.371 6.000 1.849

13.000 2.141 5.800 1.846 -

] 12.800 2.078 5.600 1.843  !

12.600 2.039 5.400 1.841 12.400 2.020 5.200 1.842 4 12.200 1.992 5.000 1.846 I I 12.000 1.978 4.800 1.856 i- 11.800 1.973 4.600 1.868 11.600 1.977 4.400 1.875 11.400. 1.982 4.200 1.879 11.200 1.986 4.000 1.883 11.000 1.992 3.800 1.894 j 10.800 1.996 3.600 1.910 10.600 1.984 3.400 1.925 10.400 1.970 3.200 1.919 10.200 1.955 3.000 1.940

10.000 1.971 2.800 1.920 9.800 1.975 2.600 1.890 i 9.600 1.969 2.400 1.864 9.400 1.960 2.200 1.843 9.200 1.951 2.000 1.837 9.000 1.949 1.800 1.824 8.800 1.949 1.600 1.818

, 8.600 1.949 1.400 1.828 8.400 1.942 1.200 1.826 8.200 1.931 1.000 1.838 8.000 1.918 0.800 2.017 7.800 1.915 0.600 2.355 7.600 1.918 0.400 2.778 7.400 1.920 0.200 3.201 7.200 1.915 0.000 3.623 7.000 1.902 4

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- Core Operating Limits Report - Page 9 of 10 02/19/97

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. The Light SOUTil TEXAS UNIT 2 CYCLE 6 c3mpany FEllRtIARY 1997 -

Table 1 (Part 2 of 2)

Unrodded Ff or f Each Core Ileight For Burnups from 10,000 MWD /MTU to EOC Core 11eight Unrodded Core lieight Unrodded (Ft.) F.y_,,, (Ft.) F,,_

14.000 3.331- 6.800 2.138 - '

13.800 3.028 6.600 2.I38 13.600 2.725 6.400 2.142 13.400 2.422 6.200 2.145 13.200 2.213 6.000 2.144 13.000 2.I13 5.800 2.141 12.800 2.073 5.600 2.141 12.600 2.034 5.400 2.I46 12.400 2.051 5.200 2.166 12.200 2.050 5.000 2.I80 12.000 2.041 4.800 2.I86 11.800 ' 2.027 4.600 2.173 11.600 2.026 4.400 2.151 11.400 2.033 4.200 2.124 11.200 2.046 4.000 2.092 11.000 2.068 3.800 2.066 '

10.800 2.076 3.600 2.043 -

10.600 2.077 3.400 2.027 10.400 2.071 3.200 2.010 10.200 2.074 3.000 1.990 10.000 2.086 2.800 1.967 9.800 2.I10 2.600 1.935 >

9.600 2.I38 2.400 1.901 9.400 2.164 2.200 1.866 9.200 2.I89 2.000 I.841 9.000 2.203 1.800 1.821 8.800 2.212 1.600 1.807 8.600 2.215 1.400 1.799 8.400 2.209 1.200 1.797 8.200 2.202 1.000 1.807 8.000 2.193 0.800 ' l.864 7.800 2.I83 0.600 2.023 7.600 2.175 0.400 2.236 7.400 2.I66 0.200 2.448 7.200 2.155 0.000 2.661 7.000 2.I45 Core Orvrating Limits Report Page 10 of 10 02/19/9-

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