ML19354D835

Presentation to NRC Re Kewaunee (Wps) SECY-83-472 LOCA Analysis Effort.

ML19354D835
Person / Time
Site:	Kewaunee
Issue date:	11/08/1989
From:	Cheung A, Dederer S, Hochreiter L WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML111660935	List: ML111660934 ML111660936 ML19354D835
References
WCAP-12441, NUDOCS 9001220239
Download: ML19354D835 (35)

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- WESTINGHOUSE CLASS 3 Q-

. . WCAP.12441 PRESENTATION TO THE US NRC CONCERNING-THE KEWAUNEE (WPS) SECY-83-472 LOCA ANALYSIS EFFORT BY L. E. Hochreiter S. I. Dederer A. C. Cheung -j A. F. Gagnon  !

1 November 8, 1989 WESTINGHOUSE ELECTRIC CORPORATION Nuclear Technology Systems Division  !

P.O. Box 355 Pittsburgh, Pennsylvania 15230

.c ,

'5-

,,' WPS NRC MEETING 11/1/89 AGENDA E

1.0 , INTRODUCTION (2.0 WPS LARGE BREAK LOCA ANALYSIS 2-1. UPI SAFETY EVALUATION REPORT REQUIREMENTS

, 2-2. .WPS WCOBRA/ TRAC MODEL AND PROPOSED RUNSJ

~2-3. WPS UPI REPORT OUTLINE 3.0? WPS:SMALL BREAK LOCA ANALYSIS 4.0 STEAM GENERATOR TUBE PLUGGING EVALUATION FOR -

CYCLEJ16 5.0- CONCLUSIONS i

. 9

INTRODUCTION o COMPLETE REVISED LARGE AND SMALL BREAK LOCA ANALYSIS FOR CYCLE 17 (SUBMITTAL JULY 1990)

WCOBRA/ TRAC ANALYSIS FOR LARGE BREAK LOCA NOTRUMP ANALYSIS FOR SMALL BREAK LOCA o NEW ANALYSES TO INCLUDE REVISED CONDITIONS DESIRED BY WPS Fo = 2.50 TOTAL PEAKING FACTOR F N = 1.70 ISktITEAMGENERATORTUBEPLUGGING 3RD LINE SEGMENT ELIMINATION FOR SMALL-BREAK LOCA OTHER CONDITIONS AS SPECIFIED BY WPS o PERFORM 100FR50.59 EVALUATION TO ALLOW OPERATION OF CYCLE 16 WITN INCREASED STEAM GENERATOR TUBE PLUGGING LEVELS (SUBMITTAL JANUARY 1990)

EVALUATE LARGE BREAK LOCA ANALYSIS OF RECDPD EVALUATE SMALL BREAK LOCA ANALYSIS OF RECORD 1

. ,. l WCOBRA/ TRAC SER FINDINGS i

o- WCOBRA/ TRAC IS AN APPROPRIATE BEST ESTIMATE ,

THERMAL-HYDRAULICS CODE FOR UPI-PWR LOCA ANALYSIS-AS PER SECY-83-472 q

[

l o SUPERB 00NDED APPROACH IS AN ACCEPTABLE HETHOD OF ESTIMATING THE.95TH PERCENTILE PCT-AS REQUIRED ,

BY SECY-83-472 o CODE UNCERTAINTY ANALYSIS SHOULD BE SEPARATED SUCH THAT BLOWDOWN PEAK-AND A REFLOOD PEAK UNCERTAINTY IS CALCULATED t

0754NLEH/102789 5

WCOBRA/ TRAC SER1 CONDITIONS LICENSING ACCEPTANCE (1) EXEMPTIONS WILL BE NEEDED TO APPENDIX K ITEMS 1.D.3 AND 1.D.5 REGARDING CORE EXIT LIQUID CARRYOVER FRACTION AND REFILL /REFLOOD HEAT TRANSFER,.RESPECTIVELY, BEFORE THE METHODOLOGY COULD BE USED TO SUPPORT LICENSING CALCULATIONS FOR THE UPI PLANTS

RESPONSE

WPS WILL FILE AN EXEMPTION TO THE ABOVE SECTIONS 0F APPENDIX K IN THE SAME FASHION AS NSP/WEP (2) SENSITIVITY STUDIES SHOULD BE PERFORMED IN EACH PLANT-SPECIFIC LICENSING CALCULATION TO DETERMINE THE LOCATION UNDER WHICH THE HOT ASSEMBLY IS PLACED TO OBTAIN THE HIGHEST PCT

RESPONSE

WPS HAS THE SAME UPPER INTERNALS DESIGN AS WEP 0754M:LEM/102789 6

I WCOBRA/ TRAC SER CONDITIONS LICENSING ACCEPTANCE (CONTD.

(3) ANY RELAXATION OF THE ASSUMPTION OF THE INSTANTANEOUS EQUILIBRIUM INITIAL CONDITION IN .

THE DECAY HEAT CALCULATION USING 1979 ANS STANDARD WILL NEED STAFF REVIEW AND APPROVAL

RESPONSE

HQ RELAXATION OF THE INSTANTANEOUS EQUILIBRIUM MODEL WILL BE USED FOR THIS APPLICATION CONCLUSIONS THE ANALYSIS PLANNED BY WPS/W WILL COMPLY WITH THE ,

WCOBRA/ TRAC SER LICENSING ACCEPTANCE CONDITIONS 0754M:LEN/102789 7

MODEL DESCRIPTION BEGAN WITH WCOBRA/ TRAC MODEL DEVELOPED FOR UPI PLANTS AS DESCRIBED IN WCAP-10924, VOLUME 2 FIRST STEP WAS TO DEVELOP VESSEL N0 DING SIMILAR TO THAT WCAP-10924-P REVISION 1 ADDENDUM 2 FOR POINT BEACH, BUT WITH MODIFICATIONS FOR DOWNFLOW BARREL-BAFFLE CONFIGURATION KEWAUNEE HAS FLAT UPPER SUPPORT PLATE, SLOTTED SUPPORT COLUMNS (SOME WITH FLOW MIXERS), FREE STANDING MIXERS, THIMBLE GUIDE TUBE DESIGN AND OPEN HOLES (I.E. POINT BEACH INTERNALS)

RETAIN THE FOUR CHANNEL CORE CONFIGURATION WITH LOW POWERED ASSEMBLIES IN AN OUTER RING -

HOT ASSEMBLY MODELED SEPARATELY IN THE LOCATION WITH THE HIGHEST PEAK CLADDING TEMPERATURE (PCT) FROM THE SENSITIVITY STUDIES MODIFY THE BASIC LOOP MODEL FROM WCAP-10924-P REVISION 1 ADDENDUM 2 FOR THE KEWAUNEE SPECIFIC RCS LAYOUT

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CALCULATIONS TO BE PERFORMED FOR SECY-83-472 APPROACH FOLLOW SAME PROCEDURE AS WAS PERFORMED FOR BOTH PRAIRIE ISLAND AND POINT BEACH PLANTS IN WCAP-10924 NOMINAL CALCULATION AS AN ESTIMATE OF THE 50TH PERCENTILE PCT SUPER-BOUNDED CALCULATION AS AN ESTIMATE OF THE 95TH PERCENTILE PCT APPENDIX K REQUIRE FEATURES CALCULATION INPUT CONDITIONS FOR EACH OF THESE CALCULATIONS ARE COMPARED ON THE FOLLOWING TABLES

WCOBRA/ TRAC CALCULATED RESULTS NSP WEP PARAMETER (PRAIRIE ISLAND) (POINT BEACH)

NORMAL PCT (OF) 1303 1382 (50TH PERCENTILE ESTIMATE)

REALISTIC ESTIMATED 1370-1750 1400-1867 95TH PERCENTILE PCT 0F

~ '

UPPER BOUND 95TH 1989 1933 PERCENTILE PCT (OF)

APPENDIX K PCT (OF) 2031 2023

WCOBRA/ TRAC LIMIT IMPROVEMENTS FOR TWO-LOOP PWRS PLANT / PARAMETER OLD LIMITS NEW LIMITS PRAIRIE ISLAND (NSP)

PEAK LINEAR POWER (KW/FT) 14.52 15.78 NORMALIZED ENTHALPY RISE 1.60 1.70 STEAM GENERATOR TUBE 5% 10%

PLUGGING (%)

POINT BEACH (WEP)

PEAK LINEAR POWER (KW/FT) 12.79 14.47 ,

NORMALIZED ENTHALPY RISE 1.58 1.70 STEAM GENERATOR TUBE 14% 25%

PLUGGING (%)

CURRENT TWO-LOOP UPI PLANT DESIGN AND OPERATING PARAMETERS PRAIRIE ISLAND KEWAUNEE PoIwr BeacN PARAMETER INVERTED FLAT FLAT UPPER SUPPORT PLATE TYPE TOP HAT 14x14 W 0FA 14x14 ANF STD 14x14 W OFA FUEL 1650.0 1650.0 1518.5 POWER (MWT)

MODEL 51 MODEL 51 MODEL 44F-UNIT 1 S.G. TYPE MODEL 44D-UNIT 2 93A 6000 HP 93A 6000 HP 93 6000 NP RCP TYPE 2250.0 2250.0 2250.0 SYSTEM PRESSURE (PSIA) ,

1.37E+06 1.32E+06 1.065E+06 CONTAINME VOLUME (FT ) .

e

CURRENT TWO-LOOP UPI PLANT DESIGN AND OPERATING PARAMETER (CONTINUED)

PRAIRIE ISLAND KEWAUNEE PorNT BEACH PARAMETER 1270.0 1250.0 1100.0 Acc WATER VOLUME (FT3 )

700.0 700.0 700.0 PRESSURE (PSIG)

DOWN UP BARREL-BAFFLE DOWN Flow DIRECTION

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PLANT SPECIFICATIONS FOR WPS WCOBRA/ TRAC ANALYSIS PRELIMINARY SUPER-NOMINAL BOUNDED APPENDIX K PLANT PARAMETER -

m.c .

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PRELIMINARY SUPER-NOMINAL BOUNDED APPENDIX K PLANT PARAMETER -

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I PLANT SPECIFICATIONS FOR WPS WCOBRA/ TRAC ANALYSIS (CONTINUED PRELIMINARY SUPER-NOMINAL BOUNDED APPENDIX K PLANT PARAMETER ~

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PLANT SPECIFICATIONS FOR WPS WCOBRA/ TRAC ANALYSIS (CONTINUED)

PRELIMINARY SUPER-PLANT PARAMETER NOMINAL BOUNDED APPENDIX K a..e.

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PLANT SPECIFICATIONS FOR WPS WCOBRA/ TRAC ANALYSIS (CONTIN PRELIMINARY SUPER-NOMINAL BOUNDED APPENDIX K PLANT PARAMETER -

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i WPS ANALYSIS REPORT EXECUTIVE

SUMMARY

1-0 INTRODUCTION AND BACKGROUND 1-1 INTRODUCTION - WHAT IS IN THE REPORT 1-2 BACKGROUND - REFERENCE GENERIC REPORTS AND NRC SER 2-0 WCOBRA/ TRAC MODEL OF WPS 2-1 INTRODUCTION 2-2 ANALYSIS METHOD

- STEADY-STATE CALCULATION

- TRANSIENT CALCULATIONS 2-3 WPS VESSEL DESCRIPTION, CHOICE OF HOT ASSEMBLY LOCATION 2-4 WPS LOOP MODELS - PRIMARY AND SECONDARY

- STEADY-STATE LOOP MODEL

- COLD LEG GUILLOTINE BREAK LOOP MODEL 0754N:LIN/102789 1

i 3-0 REALISTIC PWR CALCULATION AT NOMINAL CONDITIONS 3-1 INTRODUCTION 3-2 WPS MODEL AND LOCA BOUNDARY CONDITIONS FOR NOMINAL CALCULATIONS 3-3 RESULTS OF WPS REALISTIC CALCULATION AT NOMINAL CONDITIONS

- WPS NOMINAL CONDITION STEADY-STATE RESULTS

- WPS NOMINAL CONDITION TRANSIENT RESULTS 4-0 REALISTIC PWR CALCULATION AT SUPERBOUNDED CONDITIONS 4-1 INTRODUCTION 4-2 WPS MODEL, AND LOCA BOUNDING CONDITIONS FOR THE SUPERB 00NDED CALCULATIONS 4-3 WPS SUPERBOUNDED CALCULATIONAL RESULTS

- WPS SUPERBOUNDED STEADY-STATE RESULTS

- WPS SUPERBOUNDED TRANSIENT RESULTS 0754n:Ltu/102789 2

I 5-0 SENSITIVITY STUDIES 5-1 APPLICABILITY OF LEAD PLANT SENSITIVITY STUDIES TO WPS 6-0 WPS APPENDIX K CALCULATIONS 6-1 INTRODUCTIONS 6-2 WPS APPENDIX K MODEL AND TRANSIENT RESULTS

- WPS APPENDIX K STEADY-STATE RESULTS

- WPS APPENDIX K TRANSIENT RESULTS 7-0 COMPARISONS OF THE APPENDIX K CALCULATIONS AND THE REALISTIC CALCULATIONS AT 95% PROBABILITY LEVEL 7-1 INTRODUCTION, REFERENCE WCAP-10924

- WCOBRA/ TRAC CODE UNCERTAINTIES

- WCOBRA/ TRAC BIAS

- WCOBRA/ TRAC UNCERTAINTIES 0754M:Lin/102789 3

. 7-2 CONSERVATIVE ESTIMATE OF THE 95TH PERCENTILE PCT USING THE " SUPERB 00NDED" CALCULATION FOR WPS 7-3 REALISTIC ESTIMATES OF THE 95TH PERCENTILE

. PCT FOR WPS 8-0 NOTRUMP SMALL BREAK LOCA H0 DEL OF WPS 8-1 INTRODUCTION 8-2 BREAK SPECTRUM ANALYSIS FOR WPS INCH RESULTS INCH RESULTS INCH RESULTS 9-0

SUMMARY

AND CONCLUSION A-0 PAD 3.4 ANALYSIS OF ANF FUEL A-1 INTRODUCTION A-2 MODIFICATIONS REQUIRED FOR ANF FUEL A-3 REFERENCES 054N Lth/102789 4

i WPS SMALL BREAK LOCA EFFORT o USE OF NRC APPROVED SMALL BREAK E.M. (NOTRUMP)

ANALYSIS TO BE PERFORMED IN APPENDIX K N0DE o PEkFORMBREAKSPECTRUMANALYSIS o USE CONDITIONS ESTABLISHED BY LARGE BREAK LOCA TOTAL CORE PEAKING FACTOR (Fo) o PROVIDE ADDITIONAL SBLOCA MARGIN VIA 3RD LINE SEGMENT ELIMINATION e

WPS STEAM GENERATOR TUBE PLUGGING EVALUATION FOR CYCLE 16 5

.o TUBE PLUGGING LEVELS ARE NOT EXPECTED TO GREATLY EXCEED CURRENTLY LICENSED 10 PERCENT LIMIT o PERFORM 100FR50.59 EVALUATION TO ASSESS IMPACT OF INCREASE S.G. TUBE PLUGGING LEVEL

=

EVALUATION TO BE BASED ON WESTINGHOUSE '

SENSITIVITIES AND METHODS =

SECY-83-472 APPENDIX K RESULTS SHOULD BE AVAILABLE AS CONFIRMATION PRIOR TO CYCLE 16 STARTUP WESTINGHOUSE TO PERFORM LOCA EVALUATION SUPPORT WPS TO PERFORM NON-LOCA EVALUATION SUPPORT '

o CONSIDERABLE MARGIN EXISTS TO 10CFR50 LIMITS LBLOCA ~ 1700F SBLOCA ~ 4300F

CONCLUSIONS o THE ANALYSIS TO BE SUBMITTED BY WPS/W WILL RESOLVE THE UPPER PLENUM INJECTION ISSUE o A 100FR50.59 EVALUATION WILL BE PERFORMED TO ASSESS THE IMPACT OF SLIGHTLY INCREASED TUBE PLUGGING LEVELS FOR CYCLE 16 o THE WCOBRA/ TRAC & NOTRUMP ANALYSES WILL SUPPORT INCREASED OPERATIONAL FLEXIBILITY FOR CYCLE 17 AND BEYOND s

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