ML20127G386

Nonproprietary WCAP-13571, Pressurizer Surge Line Leak- Before-Break for Comanche Peak Unit 2,Presentation Matls

ML20127G386
Person / Time
Site:	Comanche Peak
Issue date:	12/31/1992
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML19303F189	List: ML20127G357 ML20127G367 ML20127G386
References
WCAP-13571, NUDOCS 9301210243
Download: ML20127G386 (17)

Text

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. WESTINGHOUSE CLASS 3 (Non Proprietary)  ;

I WCAP 13571 ,

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PRESSURIZER SURGE LINE LEAK-BEFORE BREAK ,

FOR COMANCHE PEAK UNIT 2 r

PRESENTATION MATERIALS ,

December 1992

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Westinghouse Electric Corporation Nuclear and Advanced Technology Division P.O. Box 355 '

Pittsburgh, PA 15230

• 1992 Westinghouse Electric Corporation All Rights Reserved -

! '9301210243 930113'.

PDR- ADOCK 0S000446

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i ENCLOSURE 2 WCAP 13571, PRESSURIZER SURGE LINE LEAK BEFORE BREAK '

FOR COMANCHE PEAK UNIT 2. PRESENTATI0H HATERIALS (NON PROPRIETARY VERSION) v i

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I-A meeting was held on November 2,1992, between TU Electric, Westinghouse, and the i NRC Staff to discuss additional information concerning the application of leak-before break

! technology to the pressurizer surge line for Comanche Peak Unit 2.

1-The presentation materials are included within.

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PRESSURIZER St[RGE LINE l LEAK BEFORE BREAK FOR

, COMANCHE PEAK UNIT 2

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CHRONOLOGY FEBRUARY 1992 ANALYSIS OF PRESSURIZER SURGE LINE LBB SUBMITTED BY TU ELECTRIC I JULY 1992 NRR REQUEST FOR ADDITIONAL INFORMATION j

ON DETERMINATION OF LEAK FLAW SIZE AND DETERMINATION GOVERNING LOCATIONS AUGUST 1992 TU ELECTRIC RESPONSE TO JULY RAI l

NOVEMBER 1992 MEETING TO RESOLVE CONCERNS REGARDING CODE USED IN LBB ANALYSIS OF UNIT 2 SURGE 4

LINE

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NODE LOCATION 1920-m 4

I HI6IEST STIESSED 1020 mi LE6 WLDL.0CAil0N -

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l Conservatisms in the LBB Methodology

• o Algebraic Sum of Loads for Leakage

) o Absolute Sum of Loads for Stability l 0 Factor of 10 on Leak Rate

! o Factor of 2 on Leakage Flaw i

i Standard Review Plan 3.6.3 1

2 Conservatisms in the Analysis o Average Material Properties for Leakage j o Minimum Material Properties for Stabllity 4

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LOW PROBABILITY OF - A, o, e OCCURRENCE OF LOAD CASE 1

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o As indicated in the surge line report, is judged to be

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a low probability event. It would Fequir the maximum heatup/cooldown stratification case to occur simultaneously 4

with the safe shutdown earthquake (SSE) event following leakage detection at 100% power.

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WESTINGHOUSE AND PICEP RESULTS FOR CASE ~'"A" LEAK RATE o Westinghouse method uses two programs. They are:

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. W, % e This program calculates the crack opening ares

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' This program calculates the leak from tg crack opening area obtained by[ ]Ttwo phase nuld conditons).

o To correspond with the 10 gpm leakage margin, ,c,e Westinghouse estimates a leakage naw size of[ ]

inches. -

i o The PICEP program calculates both the crack opening area and the leak from that area.

o To correspond with the 10 gpm leakage margin, PICEP estimates a leakage naw size of 5.0 inches.

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l PICEP OVER FREDICTION OF LEAKAGE SIZE FLAW o Crack Opening Area Predictions, o PICEP over predicts the leakage size naw by under-predicting the crack opening areas.

o The next overhead, which shows experimental data ,c,e from a four point bend test, indicates that the[

(Westinghouse method) shows excellent agreement

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with the test data, while for crack opening areas greater than 0.01 in', PICEP under predicts the opening area. For a 0.02 in' opening area PICEP under-predicts this area by about 40%

o Flow rate predictions. s o Limited test data at 2.7 GPM shows that PICEP under predicted the now by 18 24% while the Westinghouse method [ ]Ii'nd'er predicted the now by only 1-2% This is shown in the overhead with the table. .

- s,c.e o Based on . the limited experiments, _ _

predicts the test data better than PICEP. .

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! COMPARISON OF EXPERIMENTALLY l

DETERMINED LEAK RATES l AND ANALYTICAL PREDICTIONS w,c,e l

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l i CONCLUSION i o Following are the reasons why Westinghouse is convinced that the 5.0 inch leakage flaw size calculated _"by',PICEP

! does not challenge the LBB integrity of the Comanche Feak Unit 2 surge line:

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The conservatisms in the LBB methodology.

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- The low probability of occurrence of the load case a.,c,4

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The excellent agreement of the results with experimental data. _

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The tendency of PICEP to under prbict leak rates by 18 24% compared against the same data.

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NORMAL LOAD (CASE B) AND FAULTED LOAD (CASE G)

Normal Faulted Normal Faulted Normal Faulted Fx lb. FXlb. My(in. My(in. Mz (in- Mz (In.

Ib) lb) Ib) Ib)

Pressurt 219,721 41,781 0 0 0 0 DW 2,690 2,690 - 83,520 83,520 178,260 178,260

. i _ _2A6 SSE 9,080 1,887,220 589,390 ap,e TOTAL

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Normal Faulted

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Mb (in lb) 11

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