ML20070P429

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Rev 0 to South Texas Project Unit 1,Cycle 4 Core Operating Limits Rept
ML20070P429
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 03/02/1991
From:
HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20070P422 List:
References
NUDOCS 9103270287
Download: ML20070P429 (7)
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SOUTH TEXAS PROJECT ELECTRIC CENERATING STATION UNIT 1 CYCLE 4 CORE OPERATING LIMITS REPORT REVISION 0 MARCH, 1991 l

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Core Operating Limits Report (Rev. 0) 3/2/91 l

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MiTACIIEENT ST HL AE 31 A3 PAGE_a2.__0F  ?

SOUTH TEXAS UNIT 1 CYCLE 4 1.0 Core Operating Limits This Core Operating Limits Report for STPECS Unit 1 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 References 1 and 2.

The following cycle specific core operating limits required by 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 Fully withdrawn for all control and shutdown banks snall be 249 steps or above but-not exceeding 259 steps. All banks shall have the same fully withdrawn position.
2) AFD Limits as required by Technical Specification 3.2.1 are

. determined by CAOC Operations with a Delta I allowable operating band throughout Cycle 4 life of +3.126,

3) Radial Peaking Factor Limits as required by Technical Specification 4.2.2.2 are provided for Cycle 4 operation in Figure 2.

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Core Operating Limits R3 port (Rev. 0) 3/2/91 Page 1 of 6 l

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'~~ ATTACHMENT ST HL AE-3'l A 3 PAGE 2 - 97_. 7 -

SOUTH TEXAS UNIT 1 CYCLE 4 2.0 References

1. " Westinghouse Reload Safety Evaluation Methodology", '

WCAP 9272 P A, July 1985.

2. " Power Distribution and Load Following Procedures",

WCAP 8385, September, 1974.

3. NUREG 1346 Technical Specifications, South Texas Project, Unit Nos.1 and 2.

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Core Operating Limits Report (Rev. 0) 3/2/91 Page 2 of 6 l

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WESTINGHOUSE PROPRIETAPY Ct. ASS 2 - , _ . _ _

ATTACHMENT

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" SOUTH TEXAS UNIT 1 CYCLE 4 FIGURE -1 PAGE 9 0F 7 i CONTROL ROD INSERTION LIMITS VERSUS POWER LEVEL (23.259t 122 Step Overlap (79.259t 122 Step Overlap {

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l' Core Operating Limits Report (Rev. 0) Page 3 of 6 3/2/91 l

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. ATTACHMENT ST HL As 5 m 3 P/GE 5 0F 7 SOUTH TEXAS UNIT 1 CYCLE 4 FIGURE 2 RADIAL PEAKING FACTOR LIMITS The F xy limits for RATED THERMAL POWER within specific core planes shall be:

1, less than or equal to the appropriate core height dependent rodded F xy value r m Table 1 for all core planes containing Bank "D" control rods, and 2, less than or equal to the appropriate core height dependent F xy value fr m Table 2 for all unrodded core jf planes.

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

F9 (z) < [2.50/P) [K(z)) for P > 0,5 and, Fq (z) i [5,00) [K(z)) for P 5 0.5 i

assuming the most limiting axial power distributions expected to b result from 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 Reference 2. Therefore, these F limits provide assurance that the initial conditions assumed in the LOCA 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 Specificatiors.

1 Core Operating Limits Report (Rev. 0) 3/2/91 Page 4 of 6 il 1

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ATTACAiiENT

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PAGE 3 SOUTH TEXAS UNIT 1 CYCLE 4 TABLE 1 RODDED Fgy'S FOR EACH CORE HEIGHT Core Height Rodded Core Height Rodded (Feet) F xy (Feet) F 0.0 2.055 7.2 2.055 0.2. 2.055 7.4 2.055 0.4 2,055 7.6 2.055 0.6 2.055 7.8 2.055 0.8 2.055 8.0 2.055 1.0 2,055 8.2 2.055 1.2 1.817 8.4 2.055 1.4 1.817 8.6 2.055 1.6 1.817 8.8 2.055 1.8 1.817 9,0 2.055 2.0 - 1.817 9.2 2.055 2.2 1.817 9.4 2.055 2,4 1.817 9.6 2.055

2. 6 1.817 9.8 2.055 2.8 1.817 10.0 2.055 3.0 1.817 10.2 2.055 3.2 1.817 10.4 2.055 3.4 1.817 10.6 2.055 3.6 1.817 10.8 2.055 3.8 1.817 11.0 2.055 4.0 1.817 11.2 2,055 4.2 1.817 11.4 2.055 4,4 2.055 11.6 2.055 4.6 2.055 11.8 2.055 4.8 2.055 12.0 2.055-5.0 2.055 12.2 2.055 5.2 2.055 12.4 2.055-

- 5.4' 2.055 12.6 2.055 5.6 2.055 12.8 2.055 5.8 2.055 13.0 2.055 6.0 2.055 13.2 2.055 L 6.2 2.055 13.4 2.055 6.4 2.055 13.6 2.055 6.6 2.055 13.8 2.055 6.8 2.055 14.0 2.055 L 7.0 2.0$$

l l  : ore Operating Limits Report (Rev. 0) 3/2/91 Page 5 of 6 i

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ATTACHhiENT ST HL AE 3743 PAGE ~7 _ _ OF 7 SOUTH TEXAS UNIT 1 CYCLE 4 TABLE 2 UNRODDED Pg'S FOR EACH CORE HEICHT Core Height Unrodded Core Height Unrodded (Feet) F (Feet) F xy xy 0.0 2.021 7.2 1.712 0.2 2.023 7.4 1.708 0.4 2.026 7.6 1.706 0.6 1.886 7.8 1.704 0.8 1.746 8.0 1.706 1.0 1.664 8.2 1.710 l 1.2 1.620 8.4 1.715 L 1.4 1.597 8.6 1.724 1.6 1.600 8.8 1.736 1.8 1.613 9.0 1.751 2.0 .1.624 9.2 1.768 2.2 1.635 9.4 1.790 2.4 1.635 9,6 1.813 z6 1.644 9.8 1.837 2.E 1.660 10.0 1.852 I 3.0 1.689 10.2 1.853 l 3.2 1.720 10.4 1,844 3.4 1.741 10.6 1.836 3.6 1.727 10.8 1.830 l

3.8 1.715 11.0 1.821 4.0 1.703 11.2 1.807

, 4.2 1.690 11.4 1.780 L 4.4 1.682 11.6 1.755 I 4.6 1.674 11.8 1.741 l 4.8 1.668 12.0 1.730 5.0 1.668 12.2 1.733 5.2 1.669 12.4 1.754 5.4 1.669 12.6 1.776 5.6 1.674 12.8 1.832 5.8 1.681 13.0 1.923 6.0 1.687 13.2 1.929 6.2 1.697 13.4 1.973 6.4 1.709 13.6 2.041 6.6 1.720 13.8 2.036 6.8 1.720 14.0 2.032 7.0 1.716 Core Operating Limits Report (Rev. 0) 3/2/91 Page 6 of 6

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