ML19325D153

Rev 0 to South Texas Project Electric Generating Station Unit 1,Cycle 2 Core Operating Limits Rept.

ML19325D153
Person / Time
Site:	South Texas
Issue date:	09/15/1989
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML19325D149	List: ML19325D148 ML19325D153
References
NUDOCS 8910190076
Download: ML19325D153 (5)

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-SOUTH TEXAS PROJECT ELECTRIC CENERATING STATION i UNIT 1 CYCLE 2

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CORE OPERATING LIMITS REPORT REVISIO;; O SEPTEMBER 15, 1989 5

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SOUTH TEXAS UNIT 1 CYCLE 2  ;

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1.0 Core operating Limits '

t This Core Operating Limits Report for STPECS Unit 1 Cycle 2 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 Reference 1 and 2.

The following cycle specific core operating limits required by i

Technical Specifications are included in this report:

1) Control Rod Insertion Limits (Figure 1) as required by ,

Technical Specification 3.1.3.6. Fully withdrawn for all control and shutdown banks shall be 259 steps.

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2) AFD Limits as required by Technical Specificatien 3.2.1 are determined by CAOC Operations with 'a Delta 1 allowable operating band throughout Cycle 2 life of +3.-124.- -

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3) Radial Peaking Factor Limits as required by Technical Specification 4.2.2.2 are provided for Cycle 2 operation in Figure 2. I 1'

l Core Operating Limits Report (Rev 0) 09/15/1989 Page 1 of 4 I

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SOUTH TEXAS UNIT 1 CYCLE 2 2.0 References i

1.

' Westinghouse Reload Safety Evaluation Methodology",

WCAP 9272 P A, July 1985.

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2. " Power. Distribution and Lead Following Procedures",

WCAP 8385, September, 1974.

3.

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

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1 Core Operating Limits Report (Rev. 0) 09/15/1989 Page 2 of 4 l:

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TICURE 1 CONTROL ROD INSERTION LDillS VERSUS POk'ER LEVEL I

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. Core Operating Limits Report (Rev. 0) 09/15/1989 Page 3 of 4 I

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FICURE 2 RADIAL PEAKING FACTOR LIMITS l l

The F,y limits for RATED THERMAL POWER within specific core planes shall be: 1 1

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1. /TP,y less than or equal to 1.83 for all core j

, planes containing bank "D" control rods, and l RTP

2. F less than or aquel to 1.56 for all unrodded

,y core planes.

These F,y(z) limits were used to confirm that the heat flux hot channel factor Fq (z) will be limited to the Technical specification values of:

Fq (z) $ [2.50/P) [K(z)) for P > 0.5 and, i Fq (z) $ [5.00] [K(z)) for P $ 0.5 I assuming the most limiting axial power distributions expected to-result from the insertion and removal of control banks C ana D during '

operation, including the accompanying variatiens in the axial menon and power distributions, as described in Reference 2. Therefore,  ;

these F,7 limits provide assurance that the initial conditions assumed '

in the lhCA analysis are met, along with the ECCS acceptance criteria of 10CFR50.46. '

The function K(z) is given in Figure 3.2 2 of the Technical Specificat'.ons.

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Core Operating Limits Report (Rev. 0) 09/15/1989 Page 4 of 4 i