Text

Rev 1 to South Texas Project Unit 2,Cycle 3 Core Operating Limits Rept
	ML20086C980
Person / Time
Site:	South Texas
Issue date:	10/31/1991
From:	; HOUSTON LIGHTING & POWER CO.
To:	;
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ML20086C978	List: ML20086C980; ST-HL-AE-3935, Forwards Rev 1 to South Texas Project,Unit 2,Cycle 3 Core Operating Limits Rept;
References
	NUDOCS 9111250187
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l SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION UNIT 2 CYCLE 3 CORE OPERATING LIMITS REPORT REVISION 1 D

OCTOBER, 1991 2111250187 18 911:13 fiDOCK ('iL000 s.p PDR Core Operating 1.imits Report (Rev. 1) Page 1 of 8 10/11/91

__ _ __ - _ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --- ^ --

South Texas Unit 2 Cycle 3 -~

1 CORE OPERATING LTMITS REPORT This Core Operating Limits Report for STpEGS Unit 2 Cycle 3 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 for:

Technical Specification Limits included in 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 Idmits

5) 3/4.2.2 Heat Flux Hot Channel Factor 1

{

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 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 The EOL, ARO, HFP, MTC shall be less negative than

-4.0 x 10" Ak/k/*F.

2.1.3 The 300 ppm, ARO HFP, MTC shall be less negative than -3.1 x 10",Ak/k/*F (300 ppm Surveillance Limit).

Where: BOL stands for Beginning of Cycle Life EOL stands for End of Cycle Life ARO stands for All Rods Out HFp stands for Hot Full Fower (100% RATED THERMAL POWER) 2.2 ROD INSERTION LIMITS (Specifications 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2.2.2 Fully withdrawn for all Contrcl and Shutdown Banks shall;be 250 steps and above, but not exceeding 259 steps withdrawn.

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

Core Operating Limits Report (Rev. 1) Page 2 of 8 10/10/91

2. 3 Arial Flur 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 e 1 OPERATION portion of Figure 3, as required by I Technical Specifications.

2. 4. Heat Flux Hot Channel Factor (Specification 3.2.2) 2.4.1 F# "=2.50.

2.4.2 K(Z} is provided in Figure 4.

2.4.3 The Fy limits for RATED THERMAL POWER (F'")

within specific' core planes shall be:

2.4.3.1 less than or equal to 1.946 for all core I.

planes containing control Bank D rods, and ;

2.4.3.2 less than or equal to the appropriate core height-dependent value from Table 1 for all unrodded core planes.

2.4.3.3 PFy =0.2.

These F limits wa.e used to confirm that-the heat flux hoe channe3 actor F,(z) will be limited by Technical Spe _ cation 3.2.2 assuming the most i

limiting axist power. distributions expected to result l for the-insertion and removal of Control Banks C-and D

-during operation, including the accompanyin in1the' axial xenon and power. distributions,gasvariations described in WCAP 8385. Therefore, these F limits l provide assurance that the initial conditions yassumed l in the LOCA analysis are met, along with the ECCS_

l acceptance criteria of 10CFR50.46.

t.

2.5 ENTHALPY RISE HOT CHANNEL FACTOR (Specification 3.2.3)

2. 5.1' F"TP=1. 4 6.

l 2.5.2 PFu =0. 3.

L l

, '3 REFERENCES 3.1 Correspondence 5erial Number ST-UB-HL-01021, Letter from

, Robert C.. Cobb (Westinghouse) to Bob Worden (HL&P), Unit 2 L

Cycle 3 core Operriting Limits Report 9-27-91.

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

Core Operating Limits Report (Rev 1) Page 3 of 8 10/10/91

Le

, SOUTH TEXAS _ UNIT 2. CYCLE 3 , , ,

FIGURE 1 MTC versus Power Level 5

4 --

.. )

3 .

l

. . i L 2- -

l l l t

1- -

o . .

h" - UNACCEPTAGLE-OPERAT10N l s

s.

. -i g- o R c

g ." .

ACCEPTABLE OPERATION l

I i -

.- I l ..

-5 '

E 0 @ @ 100 Relative Power (%)

i

. Core Operating Limits Report (Rev.1) Page 4 of 8 10/1091 i

SOUTH TEXAS UNIT 2 0 CYCLE 3 FIGURE 2 --

CONTROL ROD INSFRTION LIMITS

YER3US POWER LEVEL (23.2591 122 Step Overte (79.2591 122 Step Overlao (23.2581 121 Step Overtap (79.258r 121 Step Overtap 260 (22.2561 119 Stao Overtao (78.2561 119 Step Overtap

, , , . , ,fI c21.254r iiv St.o Ov.rimo ii . i if (77.254: 1i7 steo Overian

( l i / '

(20.2521 115 Step Ovsetap i , , ,

fi (78.2521 115 Step Overlao l *

/ ! (19.2501 113 Step Overtap / (75.2501 113 Step Overiao

_n, , , ,

240

i i ; / i , i,

$ 120

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0 10 20 -
30 40 50 60 70 80 90 100 RelativePower(%)
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Control Bank A la nirandy withdrawn to the Fu!! Out Positlan.
Core Operating Limits Report (Rev.1) Page 5 of 8 10/10/91
, , SOUTH TEXAS UNIT 2 0 CYCLE 3 FIGURE 3 AFD Umtts versus RATED WERMAL POWER 120 l
l l
100 l
-11,90 11,90 l ~~
UNACCEPTABLEl OPERATION
/ \ UNACCEPTABLE g OPERATION -
80 7 3' ' '
- I / \ i 5 / )
u > <
! / \ l I / h 3 60 # \ l e I / \ l I 5 l
/
ACCEPTABLE N
l 7 OPERATION 1; I -31,50 31,50 I I l l l l l I
20 I l I l
-50 -40 -30 -20 -10 0 10 20 30 40 50 FluxDifference(AI)%
Core Operating Limits Report (Rev.1) Page 6 of 8 10/10/91
SOUTH'-TEXAS UNIT 2. CYCLE 3 -
FIGURE 4
- K(Z) - Normalized FsubO(Z) versus Core Height 4
l ,,
-l l
l. ' i I 7,1.0 l .
j .
1.0 --
., ' 13,0.936 I l ~~ ._l 6 .
l I
\
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1 x
I I \'
o l
1 ;
l '
.60 14,0.68
~
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' a: l I i, l I --
E l -l l
.40 -
l 1: I ;
I l l-I l-1 I
.20 l l l- -
l '
I O.00 -
0 2 -
4 6 8 10 12 14 CoreHeight(Feet) f Core Operating Limits Report (Rev,1) Page 7 of 8 10/10/91
j SOUTH TEXAS UNIT 2 CYCLE 3 i
TABI.E 1 UNRODDED Fxy's FOR EACH CORE HEIGHT Core Height Unrodded Core Height Fece Unrodded Fxy Feet hy 0.0C0 3.028 7.200 0.200 1.688 2.695 7.400 1.688 0.400 2.323 7.600 0.600 1.687 1.999 7.800 1.692 0.800 1.834 8.000 1.000 1.696 1.738 8.200 1.705 i
1.200 1.604 8.400 1.400 1.714 1.660 8.600 1.72S 1.600 1.654 d.800 1.800 1.744 1.654 9.000 1.764 2.000 1.661 9.200 1.786 2.200 1.669 9.400 1.812 '
2.600 1.683 9.600 1.833 2.600 1.701 9.800 1.840 2.800 1.730 10.000 1.844 3.000 1.750 10.200 1.845 3.200 1.757 10.400 1.844-3.400 1.755 10.600 1.838 3.600 1.742 10.800 1.834 3.800 1.728 -
11.000 1.834 4.000 1.713 11.200 1.835 4.200 1.700 11.400 1.837 4.400 1.687 11.600 1.834 4.600 1,.676 11.800 1.829 4.800 1.667 12.000 1.820 5.000 1.662 12.200 1.809 5.200 1.659 12.400 1.815 5.400 1.658 12.600 1.834 5.600 1.659 12.800 1.874 5.800 1.663 13.000 1.944 6.000 1.669 13.200 1.980 6.200 1.676 13.400 2.086 6.400 1.684 13.600 2.314 6.600 1.689 13.800 2.574 6.800 1.694 14.000 2.740 7.000 : 1.692 l
Core Operating Limits Report (Rev.1) Page 8 of 8 10/10 S 1

ML20086C980

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