ML20206A772

STP Electric Generating Station Unit 1 Cycle 9 Colr

ML20206A772
Person / Time
Site:	South Texas
Issue date:	04/30/1999
From:	Sheila Ray, Stagle W HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20206A762	List: ML20206A772 NOC-AE-000520, Forwards STP Electric Generating Station Unit 1 Cycle 9 COLR, IAW Plant TS 6.9.1.6.d
References
NUDOCS 9904290022
Download: ML20206A772 (10)

Text

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Jo%6YM Goto6 Operet ng ompany SV SOUTII TEXAS PROJECT ELECTRIC GENERATING STATION UNIT 1 CYCLE 9 CORE OPERATING LIMITS REPORT April 1999 Prepared by:

W. H. Slagle l

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APPROVED:

S. RaWMaha$h j Core Analysis B Commercial Nuclear Fuel Division Westingbouse Electric Company W

Commercial Nucleer Fuct Division P. O. Box 355 Pittsburgh, Pennsylvania 15230 Attachment to CAB-99-151 9904290022 990422 PDR ADOCK 05000498 p PDR

Attochawat to CAB M-151 N pe ma - -

SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION UNIT 1 CYCLE 9 CORE OPERATING LIMITS REPORT April 1999 Core Operating Limits Report Page 1 of 9 4/8/99

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1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report for STPEGS Unit 1 Cycle 9 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 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.

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 The EOL, ARO, HFP, MTC shall be less negative than -6.12 x 10 4 Ak/k/*F.

2.1.3 The 300 ppm, ARO, HFP, MTC shall be less negative than -5.22 x 10-4 Ak/k/*F (300 ppm Surveillance Limit).

4 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 Power (100% RATED THERMAL POWER)

HFP vessel average temperature is 589 *F.

I Core Operating Limits Repon Page 2 of 9 4/8/99

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'2.2 . ROD INSERTION LIMITS (Specification 3.1.3.5 and 3.1.3.6):

2.2.1 All banks shall have the same Full Out Position (FOP) of at least 250 steps withdrawn but not exceeding 259 steps withdrawn.

2.2.2 The Control Banks shall be limited in physical insertion as specified in Figur: 2.

2.2.3 Individual Shutdown bank rods are fully withdrawn when the Bank Demand Indication is at the FOP and the Rod Group Height Limiting Condition for Operation is satisfied (T.S. 3.1.3.1).

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 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 FqRTP = 2.55.

2.4.2 K(Z) is provided in Figure 4.

2.4.3 The F,y limits for RATED THERMAL POWER (F,yRTP) 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 1 for all unrodded core planes.

2.4.3.3 PF,y = 0.2.

These F,y limits were used to confirm that the heat flux hot channel factor F n (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,y 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.

t Core Operating Limits Report Page 3 of 9 4/8/99

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- For Unit 1 Cycle 9. the L(Z) penalty is not applied (i.e., L(Z) = 1.0 for all core elevations).

2.5 ENTHALPY RISE HOT CHANNEL FACTOR (Specification 3.2.3):

Standard Fuel VANTAGE SH / VANT3GE + / RFA Fuel pgRTP 2.5.1 Fa RTP , g ,49, , g,$37, 2.5.2 PFm = 0.3. PFa = 0.3.

3.0 REFERENCES

l l

l 3.1 Letter from R. A. Wiley (Westinghouse) to Dave Hoppes (STPNOC), " Unit 1 Cycle 9 Core ,

Operating Limits Report," 99TG-G-0041 (ST-UB-NOC-1919), April 1999.

3.2 NUREG-1M6, Technical Specifications, South Texas Project Unit Nos. I and 2.

i-Core Operating Ilmits Report Page 4 of 9 > 4/I3/99 L.

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souTu Tsxas Unir i CYct2 9 APRIL 1999 Figure 1 MTC versus Power Level I

7.0 UNACCEPTABLE OPERATION 6.0 5.0 l

'4 .0 -

3.0. ---

a 2.0 - 1 ACCEPTABLE OPERATION 1.0 - ------

0.0

.-1.0

-2.0

-3.0 O.0- 20.0 40.0 60.0 80.0 100.0 i Relative Power (%)

Core Operating Limits Report Page 5 of 9 2/18/99

SOUTH TEXAS UNIT I CYCLE 9 APRIL 1999 W==

Figure 2 Control Rod Insertion Limits

• versus Power Level asJes: tan me,omm, ps.ase: 1at me, o,.n ,

1. 389:

• 8hP 0"** ps,ang:1at as,o n ,

mass:nesieone, ps,ase:itsme,o ns, 280 , staug: straspos.ns, , gras,. ,,y .,, %

r mass:sisme,om nap ,

M ass:1tsme,o ns, e peJeg:naes,ommy

, / ps,ase:1ta me ,o ns, 2@ s r

/ , --

ggo ,

e ___ m. 8

' 200

~ ame: .

/

180 ,

' N79 Z -

a 3

2 r 7 Bank C s f40 2 '

Q '

/  ;. ,

r 120 '

a r 100 e ,

R , ,

E A

> 2 V

e , Bank D N "

gg p r

40. ,

l 20 ,

(29.C) 0 '

0 10 20 30 40 50 80 70 80 90 100 RELATME POWER (%)

Control Bank A is already withdrawn to Full Out Position. Fully withdrawn region shall be the condition where shutdown and control banks are at a position within the interval of 2 250 and s 259 steps withdrawn, inclusive, Core Operating Limits Report Page 6 of 9 2/18/99

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Figure 3 I AFD Limits versus Sted Thermal Power 1

1 120 l

100 1-11,90l 111,901

-~

UNACCEPTABLE [ k UNACCEPTABLE -

OPERATION f OPERATION .

~ 80 u / \,

E <

g  ; L

- / \

f ) '

60

) / \

g  ; ACCEPTABLE t u OPERATION g '-31,liO!

j !31,50!

40 20 a

n

-50 -40 -30 -20 -10 0 10 20 30 40 50 Flux Difference (AI) %

Core Operating Limits Repon Page 7 of 9 2/18/99

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i Figure 4 K(Z) - Nonnalized F 9(Z) versus Core Height 1.2 h' = . . _

t.s oe f

Io.s Core Elevation FQ' 0.0 R 2.55 K(Z) 1.0 '

7.0 R 2.55 1.0 14.0 R 2.359 0.925 l'A s.2 0

0.0 7.0 14.0 CORE HBGMT(FT) l Core Operating Limits Repon Page 8 of 9 2/18/P9 4

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l SOUTH TEXAS . UNIT 1 CYCLE 9 APRIL 1999 - )

1 Table 1  !

Unrodded Fxy or f Each Core Height

• Core Height Unrodded Core Height Unrodded l (Ft.) Fxy (Ft.) Fxy 14.000 3.4% 6.800 1.887 13.800 3.158 6.600 1.894 l 13.600 2.812 6.400 1.907 13.400 2.461 6.200 1.915 13.200 2.191 6.000 1.920 13.000 2.021 5.800 1.926 12.800 1.983 5.600 1.935 12.600 1.%7 5.400 1.946 12.400 1.958 5.200 1.956 12.200 1.965 5.000 1.%3 12.000 1.%9 4.800 1.965 11.800 1.977 4.600 1.964 11.600 1.992 4.400 1.%2 11.400 2.011 4.200 1.%7 11.200 2.033 4.000 1.978 11.000 2.044 3.800 1.%1 10.800 2.051 3.600 1.947 l 10.600 2.055 3.400 1.924 10.400 2.054 3.200 1.907 10.200 2.046 3.000 1.895 10.000 2.033 2.800 1.884 9.800 2.017 2.600 1.875 9.600 2.001 2.400 1.862 9.400 1.987 2.200 1.848 9.200 1.976 2.000 1.832 9.000 1.%9 1.800 1.817 8.800 1.964 1.600 1.803 8.600 1.960 1.400 1.810 8.400 1.934 1.200 1.813 8,200 1.922 1.000 1.827 8.000 1.909 0.800  !.958 7.800 1.901 0.600 2.195 7.60') 1.893 0.400 2.487  ;

7.400 1.887 0.200 2.777 7.200 1.884 0.000 3.066 7.000 1.884 For Unit 1 Cycle 9, the 14Z) penalty is not applied (l.c.,14Z) = 1.0 for all core elevations).

Core Operating Limits Report Page 9 of 9 4/8/99