ML20128A011

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Summary of 920727 Meeting W/Util,Westinghouse & Pnl in Rockville,Md Re Discussions on Steam Line Break Leakage Issues Relating to Licensees SG Tube Alternate Plugging Criteria Proposal.List of Attendees Encl
ML20128A011
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 11/25/1992
From: Hoffman S
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 9212030142
Download: ML20128A011 (94)
v • d • e


Text

l

  • 'e* . November 25, 1992 Docket Nos. 50-348 and 50-364 LICENStr: Southern Nuclear Operating company, Inc.

FACllllY: Joseph H. rarley Nuclear Plant, Units 1 and 2 SUDJLCT:

SUMMARY

Of JULY 27, 1992, MEE11NG WITH SOUTHERN NUCLEAR OPERATING COMPANY, INC., REGARDING STEAM GENERATOR TUBE ALTERNATE PLUGGING CRITERIA (TAC N05. M79818 and M79819)

Representatives from Southern Nuclear Operating Company, Inc. (the licensee),

and their contractor, Westinghouse Electric Corporation, met with the Nuclear Regulatory Commission (NRC) staff and its contractor, Pacific Northwest Laboratory, on July 27, 1992, at NRC headquarters in Rockville, Maryland. The purpose of the meeting was to discuss steam line break leakage issues relating to the licensee's steam generator tube alternate plugging criteria (APC) proposal and to discuss the licensee's proposal for an interim APC to be implemented at Joseph M. Farley Nuclear Plant, Unit 1. Due to the extent of the proprietary material discussed, the meeting was not open to the public.

Attendees at the meeting are listed in Enclosure 1.

A summary of the meeting and subsequent NRC staff actions are contained in Enclosure 2. By letter dated August 24, 1992, the licensee submitted the handouts as WCAP-13464 (Proprietary) and WCAP-13465 (Non-proprietary),

Response to NRC Questions on f arley Steam Generator Tube Alternate Plugging Criteria Presentation Materials," dated August 1992. Pursuant to the provisions of 10 CFR 2.790, WCAP-13464 is being withheld from public disclosure. Enclosure 3 is a copy of WCAP-13465 (Copyrighted) which contains-the non-proprietary information discussed at the meeting.

ORIGINAL SIGNED BY:

Stephen T. Hoffman, Project Manager Project Directorate 11-1 Division of Reactor Projects 1/11

Enclosures:

1. List of Attendees
2. Meeting Summary
3. WCAP-13465 Summary was held until WCAP-13464 Proprietary acknowledgement letter was issued.

OFC LA:PD21;DRPE PM:PD2120flPE D://E21:DRPE NAME MAnNrson SHoffnd:'ims EAdham _.

DATE 11/h/92 11/tT/92 11/p.Y/92 Cocument Name: FA79818.MTS '

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w O bi 9212030142 921125 - -

PDR ADOCK 05000348 h. G h 'i P PDR r

.-_-. _ _-_ _ _____ -. E

Mr. W. G. Hairston, !!! Joseph M. Farley Nuclear Plant Southern Nuclear Operating Company, Inc.

cc:

Mr. R. D. Hill, Jr. State Health Officer General Manager - f arley Nuclear Plant Alabama Department of Public Health Southern Nuclear Operating 434 Monroe Street Company, Inc. Montgomery, Alabama -36130-1701 P.O. Box 470 Ashford, A?abama 36312 Chairman ,

Houston County Commission Mr. B. L. Moore P.O. Box 6406 Manager, Licensing Dothan,-Alabama 36302 Southern Nuclear Operating Company, Inc. Regional Administrator, Region 11 3 P.O. Box 1295 U. S. Nuclear Regulatory Commission Birmingham, Alabama 35201-1295 101 Marietta Street, Suite 2900 Atlanta, Georgia 30323 l James H. Hiller, 111, Esq.

Balch and Bingham Resident inspector P.O. Box 306 U.S. Nuclear Regulatory Commission 1710 Sixth Avenue North P.O. Box 24 - Route 2 Birmingham, Alabama 35201 Columbia, Alabama 36319 ,

i

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l ENCLOSURE 1 blI.mDELLLSI July 2 7.u_1192 liRLliELIlliGEld 50VIBIRUM LAR_QEEM111iLCQtiL%!it SILA.M_g[NLRA10R lyEE ALTlRNATE ELVEG114G CR1IERIA NAME QRGb!]lZATION S. Hoffman NRC E. Adensam NRC J. Richardson NRC K. Matthews Westinghouse S. Hodge AEPSC/0.C. Cook K. Toth AEPSC/D.C. Cook N. Economos NRC S. Long NRC E. Hackett NRC J. Muscara NRC R. Kurtz Battelle-PNL P Heasier Battelle-PNL R. Mullins SNC B. Moore SNC T. Pitterle Westinghouse G. Johnson NRC E. Murphy NRC D. Malinowski Westinghouse s N. Salgado NRC K. Karwoski NRC L. Marsh NRC S. Casey SNC D. Pugh SNC -

R. Assa NRC H. Chernoff PGE/ Trojan '

K. Eccleston NRC J. Lee, Jr. Virginia Power E. Throckmortan, 111 V'rginia Power G. Whiteman We tinghouse P. Prabhu Westinghouse K, Campe NRC J. Stang NRC J. Winton NRC H. Conrad NRC-

, ENCLOSURE 2

SUMMARY

OF JULY 27, 1992, HEETING CONCERNING INTERIM AND ALTERNATE STEAM GENERATOR TUBE PLUGGING CRITERIA By letters dated July 10 and August 4.1992, the Nuclear Regulatory Commission staff transmitted to Southern Nuclear Operating Company, Inc. (the licensee),

a request for additional information (RAI) concerning their requested amendments for steam generator tube alternate plugging criteria. The licensee was requested to address preliminary findings by the staff (provided in Attachment A to the RAl) that the licensee's proposed steamline break (SLB) leakage model may not be sufficiently conservative, and, in addition, that the proposed Monte Carlo analysis may be substantially under-predicting leakage that should be yielded by the model, lhe licensee's contractor, Westinghouse '

Electric Corporation (Westinghouse), made a presentation responding to these concerns. Details of the Westinghouse presentation are contained in the-meeting handouts (Enclosure 3). The staff mtde the following three comments concerning the Westinghouse presentation:

1. The licensee's estimates of SLB leak rate are based on the 90% comulative probability values of the potential leak rate distribution for each indication as determined by Monte Carlo techniques. The staff believes the use of the 90% cumulative probability value is non-conservative
because it does not appear to adequately account for the upper tail of the leak rate versus voltage distribution. The staff believes that the upper tail of the distribution is likely to be a dominant contributor to the total leakage in each steam generator when dealing with large numbers of leaking tubes. The staff believes the arithmetic mean is more appropriate .

for use than the 90% cumulative probability value. '

2. The SLB leakage data used in the licensee's regression analysis include both censored and uncensored data. The staff believes that if censored data is to be used, the regression technique to fit the data should be appropriate for censored data. The staff's contractor has provided the licensee a copy of a technical paper discussing this issue entitled, "A Note on the Regression Analysis of Censored Data," published in Technometrics, Vol. 23, No. 2, dated May 1981.
3. The fit of the regression model to the data should be assessed and shown to be appropriate.

The licensee stated it would consider these comments, r

in response to question 4 of the RAl, Westinghouse presented the status of its

, ongoing evaluation of burst pressure and SLB leakage versus voltage

, correlations for 3/4 inch tubing. Westinghouse is evaluating Belgian pulled tube burst strength, SLB leakage, and voltage amplitude data for incorporation into the existing data base for 3/4 inch diameter tubing, issues regarding how the Belgian voltage amplitude and leak rate data are to be normalized to be consistent with the existing data were presented. Westinghouse also discussed considerations for comparing and combining burst and SLB leakage versus voltage data for'3/4 inch tubing with that for 7/8 inch tubing.

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. The licensee _ stated that it planned to submit, by August 28, 1992, a proposal for an interim APC to be implemented at Joseph M. Farley Nuclear Plant (Farley), Unit 1 during the upcoming refueling outage beginning September 25, 1992, Westinghouse presented the technical justification for this proposal.

Specifically, the licensee is planning to propose:

  • Eddy current bobbin probe (bobbin) indications less than 1 volt do not require repair.

Above 1 volt, bobbin indications confirmed by a rotating pancake coil probe (RPC) shall be limited to 200 indications per steam generator between 1 and 2 volts.

All bobbin flaw indications above 3,6 volts will be repaired.

As part of its presentation of the technical justification for this proposal, recognizing that there remain technical issues to be resolved regarding the Westinghouse methodology for calculating SLB leakage (see earlier discussion above), Westinghouse presented an alternative, largely deterministic method for determining SLB leakage that could be used in support of the planned interim APC proposal.

The licensee requested feedback from the staff on the planned interim APC proposal as soon as )ossible. After a staff caucus subsequent to the meeting, the staff informed tie licensee by telephone that the proposal _to accept up to 200 indications per steam generator between 1 and 2_ volts would not be acceptable. As has previously been approved for farley, Uni'. 2, it is the staff's position (pending completion of the APC review) that ii.'_arim voltage--

based limits shou M not exceed 1 volt (as measured by a bobbin) for bobbin indications confinned by RPC, and should not exceed 3.6 volts for bobbin indications not confirmed by RPC.

, + ,

, WESTINGHOUSE CLASS 3 (NON PROPRIETARY) Enclosure 3

, . WCAP-13465 l

RESPONSE TO NRC QUESTIONS ON FARLEY STEAM GENERATOR TUBE ALTERNATE PLUGGING CRITERIA ,

PRESENTATION MATERIALS-G. W. WHITEMAN AUGUST 1992 P

l-  ;.

Westinghouse Electric Corporation Nuclear and Advanced Technology Division

,. P.O.-Box 355' i- Pittsburgh. Pa. 15230

-(c) 1992 Westinghouse Electric Corporation All Rights Reserved

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. - - . . . . . - . _ . _ . . . . - . . . . . _ _ . _ . . _._,,_ .. _ _ . , , , - f- __ _ - . , . . . . . . _ ,

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  • A meeting was held on July 27,1992 ompany, based alternate plugging criterion for th e voltage er diameter The presentation rnaterials are included within. erator tubes. initiate The following te, pics were discussed by Westinghouse:

1.

altemate steam generator tube p10gging enterion e 2.

signals having confirmed IUC indicatio ,

ro e er steam generator volts will be plugged or repaired.between 1.0 and 2.0 volts. All bobbin probe A status of the evaluation of 3/4" tube diameter data and the impa existing tube bunt and leaktightness database was provided antoout. the NRC s 1

1 PAGE 1 l

\ _

JULY 27, 1992 INTERIM PLUGGING CRITERIA ISSUES INTRODUCTION BRAD MOORE e

STEAM LINE BREAK LEAKAGE TOM PITTERLE e

INTERIM PLUGGING CRITERIA TOM PITTE RIcx MULLINS e CONCLUSION BRAD MOORE l

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PAGE 2 l

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SLB LEAK RATE ANALYSES

. QUESTIONS 21, 22 AND ATTACNMENT-A DISCUSSION TOPICS  ;

ATTACHMENT A ISSUE

SUMMARY

MEAN LEAK RATE e

e MEAN

" EXPECTED" OF LOG NORMAL VS ARITHMETIC AVERAGE -

" AVERAGE" 0F ATTACHMENT A VS REAL '

LIKELIN000 0F OCCURRENCE CONVERGENCE OF MONTE CARLO e

EXAMPLES FOR SAMPLING OF LEAK RATE CORRE FORM OF LEAK RATE CORRELATION ,

e e CONCERNS ON ATTACHMENT A CORRELATION e BASIS-FoR FARLEY/EPRI CORRELATION e SENSITIVITY ASSESSMENT OF CORRELATION CONCLUSIONS ALTERNATE e SLB LEAK RATE ANALYSIS METHODS MONTE CARLO e DETERMINISTIC PROBABILITY OF LEAKING TUsES L

PAGE 3 t

prostions

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CRACK LENGTH CONSIDERATIONS F0  !

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CRACK e LENGTH FOR' BURST =

36P-CRACK LENGTH o )"THRUWALL '"

(>0. 75" TSP '

R.G.1.121 EXCESSIVE MARGINS AGAINST BURST AT CRITERfA FOR CRACK LE' CRACK LENGTHS (PART-THRUWAL PRESSURES >9000 PSI e RST TSP ODSCC CRACK LENGTHS OFTEN OCCASIONALLY (MICR0 CRACKS)

LOCAL, SHORT AN ,

REPAIR BASIS OF PLUGGIN e

CANNOT DEVELOP A CRITERIA BE APPLIED CONSERVATIVE DUE-TO CU TOe LIMITED ACCURACY ON DEPTH HRUWALL CALLSDUE WOULD NEED RPC VOLTAGE FOR GROWTH DATA)

COULD REQUIRE EXCESSIVELY CONSER INSPECTION OF ALL TSP INTERSECTIONS ON CRACK LENGTH SCREENING CONCLUSIONS e

CRACK LENGTHS WOULD LEAD TO EXCES e

CONSERVATIVE TO POSTULATE AS THRUWALL REPAIR CRITERIA NEED DUE T CRACK LENG1MS ACCURATE DEPTH VS LENGTH CAN ONLY NDE MEASURE BE U NOT WITHIN CURRENT OR NEAR TE 4.

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SLB LEAK RATE ANALYSES 2

. ATTACHMENT A Issue

SUMMARY

UTILIZATION e OF PROBABILITY OF LEAKAGE PROPOSED IN ATTACHMENT I

\

, e NOT CURRENTLY PART OF APC 1

FORM OF LEAK RATE CORRELATION e

UTILIZATION OF NON-LEAKING DATA IN DEFINITION AND INTERPRETATION OF "M 0F DISTRIBUTION e

APPLICABILITY OF AVERAGE OF DISTRIBU CONVERGENCE OF MONTE CARLO e

NUMBER OF SAMPLES REQUIRED p

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, l SLB LEAK RATE ANALYSES HEAN" LEAK RATE DEFINITIONS i DEFINITION B OF "MEAN" 0F LOG NORMAL D:sTRIsUTION '

"HEAN" DEPENDENT ON COORDINATE SYSTEM:

I LOG OR LINEAR SYSTEM '

B LOG / LOG COORDINATES

- LOG OF DISTRIBUTION APPROACNE5 NORMAL MEAN (AVERAGE OF LOG YALUE5) AND MED e BEST ESTIMATE VALUE IN LOG COORDINATES  ;

LOG NORMAL IN LINEAR COORDINATES

- I MEDIAN UNCHANGED MEAN (AVERAGE OF ABSOLUTE OR LINEAR V 3 5HIFT5 TO LARGER VALUE A5 A STRONG FUNCTIO OF STANDARD DEVIATION i MEAN 15 DIRECT NUMERICAL AVERAGE OVER I DISTR.TRUTION AND CAN BE DOMINATED BY UPPER TAIL OF THE DISTRIBUTION NUMERICAL AVERAGE ("HEAN") 0F LOG NORMAi IS NOT AN EXPECTED VALUE B

INCREASES ABOVE MEDIAN OR EXPECTED VALUE '

e CORRELATION A5 STANDARD DEVIATION INCREASES FOR LEAK RATE CORRELATION, ' AVERAGE NUMBERS -OF DIFFERING BY A FEW DECADES SUCH THAT LARGEST DISTRIBUTION VALUE5 DOMINATE AVERAGE AVERAGE : + '

INTERVAL 90% ON ONE-SIDED PREDICTION l

MONTE CARLO ANALYSIS RESULT AT 90% CUMULATIVE PROBABILITY (TWO-SIDED) ON DISTRIBUTION SHOULD B THAN NUMERICAL AVERAGE e

MONTE CARLO ANALYSIS ARE CONSISTENT WIT VALUES '

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.g Figure 3 Comparison of Expected c 0n of teak Rates as a Fun Votege for the Ahemate and Westingbuse o es

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PAGE 9 l

. n i MONTE CARLO CONVERGENCE SAMPLING OF l.EAk RATE CORRELATION e

PERFORMED FOR 2.0 AND 6.2 VOLT INDICATION .

SPAN REGION OF INTEREST e

PERFORMED WITH - AND WITHOUT GROWTH + HDE '

UNCERTAINTY e

EVALUATED AT CUMULATIVE PROBABILITY 90% CUM. PROS. <+

90% ONE-SIDED CONFIDENCE CONCLUSIONS e

CUMULATIVE PRoBAsILITY CONVERGENCE WITHIN 10,000 SAMPLES

~5% OF THEORETICAL ON LEAK RAT ESSENTIALLY No DIFFERENCE FROM: THEOR AT 100,000 SAMPLES e

NUMERICAL AVERAGE OF PREDICTED DISTRIsUT HORE DIFFICULT TO CONVERGE DUE TO SENSITIVITY TO A FEW LARGE -5AMPLES '

YARIATIONS BY FACTORS -OF 2-4 BETWEEN 10,000 AND 1,000,000 SAMPLES-PAGE 10 croatson nt rfu"*? r y e qty = p w y-+ p-q w g nu ry avy94==gte-e-me, g p e s 9qww--_ -v-ty y - --c-u. y- w =>-yetm g- -w---*-wen s ty wy-q y '

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. . I EXAMPLES OF HoNTE CARLO CONVERGENCE NO. MONTE

{_ARLO_$AMPLEs GPM WITHOUT GROWTH OR NDE UNC.

HEDIAN AVERAQI 90% CUM.

2.0 VOLT INDifAI1QB 1,000 2.0E-6 10,000 1.9E-3 2.8E-4 2.4E-6 2.5E-2 2.3E-4 THEORETICAL 2.3E-6 ~1.2E-3* 2.4E-4 6.2 VOLT INDICATION 5,000 1.6E-4 10,000 7.6E-2 1.4E-2 1.8E-4 1.3E-1 1.5E-2 50,000 1.8E-4 100,000 1.2E-1 1.6E-2 1.7E-4 6.1E-1 1.6E-2 200,000 1.7E-4 500,000 4.6E-1 1.6E-2 1.7E-4 3.6E-1 1.6E-2 1,000,000 1.7E-4 3.3E-1 1.6E-2 THEORETICAL 1.7E-4 ~6.2E-2* 1.6E-2 oTH EL.;i' '4'b :

(LA E, r AL OF ATTACHMENT 90LATION). 2 ASSUMES NORMAL DISTRIBU (LIMITEc POPULATION). CORRELATION BASED ON T PAGE 11 sotmnonm

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  • - 1 CONCERNS ON ATTACHMENT A CORR STATISTICAL FIT TO PART OF AINT DATA TO4 BE CONSISTENT WITH PHYSICS OF LEAKA '

IGNORES THRUWALL CRACKS WIT OF DATA BASE 9

INCONSISTENT WITH KNOWLEDGE R LEAKAGE AT LOW VOLTAGES HICH V0LTAGES - T AND LARG '

e SLOPE OF FIT INCONSISTENT WITH DEPENDENCE ON CRACK SIZE COMPARISON e OF LEAK RATE CORRELATIONS FARLEY/EPRI r CORRELATION -

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J-e ALTERNATE CORRELATION L.R..c y0.70

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  • t FORH OF LEAK RATE CORRELATION BASI 5 FOR FARLEY AND EPRI APC i

CORRELATION MUST SATISFY KNOWN 9

STATISTICS SHOULD BE USED ONLY T 8

CORRELATION WITHIN BOUNDING PHYS LEAKAGE LEAKAGE SHOULD BE -

9 .

ALL PULLED TUBE AND MODEL BOIL THRUWALL CRACKS FOR"INDICATESNEGL l I i

EVENIFTHRUWALLCRACKOCCURhED, LENGTH WOULD BE TOO SHORT (<0.15")

e TO HAVE MEASURABLE LEAKAGE

  • EXPONEpT OF VOLTAGE SHOULD BEr ON THE LEAK0NRA}E VS CRACK LENGTH HAS t

OF,  ;

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A SIGNIFICANT THRUWALL CRACK W l

e CORRELATION CONSISTENT WITH LEAKAGE PROBASILITY OF LEAKAGE VS VOLTA 1

VOLTAGE VALUE AND 14AV CRACK T

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FORM OF LEAK RATE CORRELATI0' BASIS FOR FARLEY AND EPRI/APC ATION TA NONLEAKERS WITH THRUWAl - L CRACKS SHO PLOTTED AT ABOUT e LABORATORY THRESHOLD APPROXIMATELY r

ETECTICH lj OF LExKAGE e

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/HR RESULTS IN STEEPER SLOPE AND LARGER OR LEAK UNCERTAINTY ,

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CRA CKS, DeTA ON NONLEAKERS WITH THRUWALL TO Ak,'H0k CURVE AT LIMITED DATA ON NON-THRUWALL BE USED CRACKS 8 'EAKAGE INDICATIONS SHOULD BE >90%

'".EP BY DESTRUCTIV E EXAM TO PROVIDE VOLTAGES THRUWALL CRAXS OF SHORTREPRESENTAT 9

VOLTAGE INTER -

ACCEPTABLE 'PT AT ~ZERO n4 LEAKAGE MUST BE 2:o m er PAGE 18

_ - - - - - - - - - - - - ^

1 ,,

m LEAK RATE CONSIDERATIONS FOR SELEC MODEL BOILER SPECIMENS 543-1, 543-2 e

SPECIMENS PART OF INITIAL TESTS UTILIZED EXISTING MODEL BOILER SPEC UTILIZED 9 EXISTING-LEAK TEST FACILITY-e LIMITED TO ~6 L/HR LEAK RATE CAPACI  ;

SPECIMENS COUND TO HAVE 6 L/HR LEAK RATE VISUAL EXAMINATION OF BURST CRACK I '

e LEAK-RATE SHOULD HAVE BEEN >6 L/HR SPECIMENS THEREFORE NOT INCLUDED IN L CORRELATIONS S

LEAK RATE FACILITIES SUBSEQUENTLY MO INCREASE LEAK RATE CAPACITY FA9L2Y e PM LED Tust R31046 NOT LEAK TESTED BUT SMALL THROUGHWALL e (0,02") INDICATED NO LEAKAGE WOULD BE EXPECTED EVALUATION OF DESTRUCTIVE EXAMINATIO FACE INDICATED CRACK-WOULD NOT OPEN SUF e (>0.1") TO LEAK AT SLB CONDITIONS

, THEREFORE IN LEAK RATE CORRELATION INCLUDED AS NON-LEAKER AT i.

4P2042:073292 PAGE'19

~

t s

. I

- . y .s ,, , , ,_

.. c, 5

[ '7&. , .c dt; -

E,--.,a.'(5 o

. .- t. .%

y o .* /

. . . .t

, .? ,, b' K ,,,

. ,. 1. :

. . . , ,s A7..~,.. r , .

~~s ,, ,

ue Figure 3.2 - SM fractography of the opened first support plate crevice crack. The montage starts 0.2 laches above the crack bottom acc* 3xtends 0.32 inches above this The inch 0.62 'L' marks latergranular ledges where smaller cracks have joined t.ogether to form the sacro-crack.

corrosion regica and the shear area where the materials was tora la the labo Area A shows enlargement anshear of the enlargement area. of the latergranular corrosion region, and area .

an B shoss

_ . _ _ _ _ i I .

l-'

l l' _

3 SENSI .

IVITY ASSESSMENT OF SLB LEAK RATE CORRELA 3ENSITIVITY 4 TO MODELING WITHIN 7/8" TUBING DEFINITION OF ~0 LEAKAGE.FOR NON-LEAKER 0F DETECTION I

e DELETION OF NON-THRUWALL TUBES AT ~0 LEA TRENDS FORM 3/4" TUBING DATABASE (SOME RATE DATABA$E THAN 7/8" DATA) 9 DATA FROM INCOMPLETE, ONGOING EVALUATION OF 3/4" TUBING (PRELIMINARY) e 3/4" VOLTAGES INCREASED BY 1.36 FACTOR FOR COMPARISONS WITH 7/8" DATA 6

3/4 LEAK RATES DECREASED BY 20% FoR c0MP WITH 7/8 DATA COMPARISON OF SLOPSS AND ~0_ LEAKAGE INT TRCNDS e

FROM COMBINED 3/4" AND 7/8" DATABASE PRELIMINARY DATA e

COMPARISON- OF SLOPES AND ~0 LEAKAGE INTE PAGE 21 P}Q$2:C72292

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - . - _ _ _ _ _ _ _ _ ____ _ __ _ _a

SENSITIVITY OF SLB LEAK oELING RATE CORRELATI ANo DATA RATIO sg No or Avs.

DESCRIPTIoM ZEno Core. To 8" DATA PoINrs CONSTANT STo.

1 F Exponent COEFF.

NoMxnAL FAnLEY ERaon L.R.

2 (7/8" oNLY) 99 CASE 1, MoorFIEn ZERO 3

CASE 2, TW DATA ONLY 4

CASE 3, MooIFIED y

> ZERO P, i.

m

~ 4" DATA

  • Al p J REFERENCE EVAL.

8"+3/4" DATA _* m9 B1 C1 REFERENCE EVAL.

CASE B1, DELETE t ZERO DATA.

J5LTERNA M COMBINATION (3/4"N. B. )

RELIMINARY EvatuATxon E

=

~

1 w

SLB LEAK RATE EVALUATON r COMPARISON OF REGRESSION UNES --

~'

9-

-i E

LU F-n:

a 9

v>

BOBBIN AMPUTUDE, VOLTS

O MB SPEOMEN I PULLED TUBE -- CASE 1:

- CASE 2 --- CASE 3 .w CASE 4 t

PAGE 23 i

I s J mw, - -

e -

,, -- ...n

E F

)

_ SLB LEAK RATE EVALUATION 1 l CASE A1: 3/4' OD DATA

,g 2

=

Y b

e v>

BOBBIN AMPUTUDE, VOLTS "

A MS SPEQMEN N ' PULLED TUSE - REGR. PIT .

! PAGE 24 l

l

-- _ - . - - - - -- - - -^ -

_ FORM OF_ LEAK RATE CORRELATION CONCLUSIONS INCREASED (SLOPE, DATABASE FROM 3/4" TUBING SUPPO

-CORRELATION ZERO LEAKAGE INTERCEPT) 0F SLB LEAKAGE-SENSITIVITY STUDIES INDICATE VARIABILITY g

{0N LEAK RATE CORRELATION IS ABOUT A FACTOR OF VOLTS BASED ON 7/8" DATA ONLY.

CHANGES WHICH INCREASE THE NOMINAL LEAK RATE TEND TO REDUCE THE COR STANDARD ERROR.

INCORPORATING NON-LEAKERS AT ~ZERO LEA STANDARD

~ZERO LEAKAGE ERROR DATA. (CONSERVATISM) COMPARED TO FO A PRELIMINARY COMBINATION OF THE 3/4" AN TUBING-INDICATES 3/4" TUBING.g A TREND TOWARD GREATER LE FACTOR OF THE COMBINED DATA THEN RESULTS IN UP -

INCREASE IN THE LEAK RATE CORRELATION COMPARED t0'THE 7/8" DATA ONLY.

l.

l l

t PAGE 25 erostion292

, , _ . . . w,--

ALTERNATE SLB LEAK RATE ANALYSI MONTE C RLO ANALYSIS e ADVANTAGES CAN READILY ACCOMMODATE ANY TYPE DISTRIBUTION (DIRECT MEASUREMENT, NORMAL, T,

ETC.) PRESCRIBED FORMULA OR CU PROBABILITY DISTRIBUTION OUTPUT YIELDS CUMULATIVE PROBAB DISTRIBUTION OF LEAK RATES WHICH C EVALUATED (90%) AT THE DESIRED CONFIDE e

DISADVANTAGE REQUIRES COMPUTER PROGRAM DETERMINIS7IC ANALYSIS e ADVANTAGE e SIMPLICITY IN APPLICATION DISADVANTAGE ,

REQUIRES ASSUMPTIONS ON UNCER TO BE APPLIED FOR EACH VARIABLE (NDE GROWTH, LEAKAGE)

PAGE 26

'roariorr 92

i, .- ,

ALTERNATE SLB LEAK RATE ANALYSIS M i

DETERMINISTIC e MODEL EVALUATED EOC VOLTAGE = BOC VOLTS GROWTH

- +- NDE UNC.1+

NDE UNC. AND GROWTH EACH ADDED CUMULATIVE PROBABILITY 9

LEAK RATE FOR E00 VOLTS EVALUATED AT:

l l

90% CONFIDENCE-ON MEAN OF SLB L CORRELATION 90% PREDICTION INTERVAL OF SLB L CORRELATION COMPARISON 9 FOR- BOC 2.0 VOLTS 9 MONTE CARLG SLB LEAKGPMRATE = 2.3X1 DETERMINISTIC FARLEY 1,2 GROWTH / CYCLE AT 90% cum. '

PR0s. = 0.6 VOLTS NDE UNCERTAINTY AT

- EOC VOLTS = 2.927 VOLTS 90% --g-

= 16% = 0 LEAK RATE: 90% ON MEAN =t a

3 e 90% ON PRED. INTERVAL r =

MONTE CARLO RESULT CONSERVATIVELY DETERMINISTIC METHODS ~ APPLYING 90%

INTERVAL 90% ON MEAN IS HORE: REPRESENTATIV -

COLLECTIVE LEAKAGE FROM A LARGE- P PAGE 27 rosanonm I

_____._.__.____.__________i____.___________.________

- - - - , " -- , , ,--m _

PROBABILITY OF SLB LEAKAGE ASSESSMENT e

COMBINED 7/8"BASED AND 3/4" 0ATA ON PULLED TUBE AND M e

167 INDICATIONS' e

EVALUATED AS PERCENT OF INDICATIONS W AS A FUNCTION OF VOLTAGE EVALUATED FOR:

LEAKAGE >0.0 L/HR LEAKAGE e >1.0 L/HR = 0.0044 GPM 225 INDICATIONS ~1 GPM CONCLUSIONS e _

_S THRESHOLD FOR LEAKAGE >0.0 t/HR.

. 9

- FARLEY PULLED TUBE TUBE R4C73 e

THRESHOLD FOR LEAKAGEPLANT R-1 (3/

g PLANT E-4 (3/4"T R33C96 (1.5 t/HR) ~AT e

4.8-7.2 VOLTS DEPENDENT ON CURRENT VO RENORMALIZATION UNCERTAINTY IMPLICATIONS FROM LEAKAGE EXPERIENCE LEAKAGE F,0R _EgC INDICATIONS <2.5 VOLTS WOULD BE ~

LEAKAGE 50REOCINDgCATIONSOF2.5-4 VOLTS WOULD BE e

~22'SE00INDiCATIONSOF2.5-4V0gTS WCULD HAVE SLB LEAK RATE ..

PAGE 28 3&2:073292

PRonABILITY OF SLB LEAK - Swe4ARY DATA BASE ^

E TYPE OF VOLTAGE DIRECT MEASUREMENTS g SPECIMEN INFERRED FROM MORPHOLOGY

_ RANGE _ No LEAK <1.0L/na* 11.0L/na No Lr.ag Lgag N00EL 0.1 - 11 BOILEn 10 80 6.5 - 140 i PULLED 0.2 - 10 TUsES 2.8 - 34 18 - 44 0.2 - 2.8 7.0 36 HODEL 0.6 - 6**

s BOILER 4-9 R 4.2 - 65 3 PULLED 0.4 - 2 TusEs 1.8 .

3.5 - 10 0.2 - 1.2 TOTAL INorcArrons = 167 e M00EL BorLEn = 74 e PutLEn TusEs = 93 1.0 LITER /He = 0.0044 GPM On ~225'IwoICATIons AT L/HR PER GPM. .

DIRECT 3/4" VOLTAGES WITHOUT 1.36 FACTOR FOR COMPARING WITH 7

2.9

. t ,

l

$ 4 .,

9 -'

SLB LEAKAGE - MB SPECIMEN DATA

_g l

9 I

g 2

y a

l _l_

b I

PAGE 30

,, y -.

. . _ . . . . - . , . - _ . , _ . = ~ . . - - - - _ - __- -

.. .. . . . _ . ~ - - - - - - - - - - ' " - ~ ' " ^ ~ ~

c_ :

-' .  :! .: f. . .

4 SLB LEAKAGE - PULLED TUBE DATA _ ,- t E

b i

~

e SOBBIN AMPUTUDE RANGE, VOLTS ^

Q WTTH LEAK I IW!THOUT LEiAK 4

PAGE 31

h P'

SLB MGE PROBABluTY

,g.

t i

b 8

a 8

4 1

BOBBIN AMPUTUDE RANog, yOLTS - a 1

PAGE-32

-___,-,-.m_,4-, -- ,,

_ m a js, dm* - iA ae - J 4 ,.am- + 4*.w44 r- -. . - ,e-s ..a-m - 4 m , a.s, a- -e sea  % , ,._.-.

O

, a . , '

8e' e e

4 SLB LEAKAGE PROBA81UTY =

-^

_ . g.

8 1

8 th t

-l M

PAGE 33

+ - . * -

- -

  • 4 n+.a nass a aa------.--e+nu--2. e e s. .n-- =ame s .a a a- ,~...-,sp a-. . - =---,s -..w .aw-s an.* - . . ,wu.v s sass. .s.4 g 4

e.

f

, e 4

i l

e SLB LEAKAGE - MS SPECIMEN DATA

- -9

^t I

  1. 1M L l LEAK < 1 Lpgg 4

5 PAGE 34-a

4

.. . t

.g -9

-I SLB LEAKAGE - PULLED TUBE DATA-

9. .

I b

I I

J.

OM>1M 1. luiAK < 1 Lael---

PAGE 35

, - ,-- ,- y,-,,

e SLB LEAKAGE PROBABlUTY

, 9 1

A b

I a

8 i

W PAGE 36

. .. - . . ..~ ....~. - ...~ -, ._. .

7 SLB LEAKAGE PROBABluTY=

9 G

a.

J A

8 8

8 I

-M DATA

- LOOSTIC RT -

PAGE 37 4

,sw --, - , _ , .-.y ---

__ _ - - - - - ~ - - ~ ~ ~

4

\ .

. OVERALL CONCLUSION THE FORM (SLOPE, ZERO LEAKAGEEYINTENCEPT SLBTuaING 3/4" LEAK DATA. RATELEAKAGE CORRELATION BEHAVIOR IS AND SU CLUDING 0

UNCERTAINTY ON NOMINAJ. CpRRELATION A BE ABOUT A FACTOR OF ABOUT 2 AND 10 v0LTS7 ~ CN LEAK RATES BETWEEN MONTE CARLO ANALYSES FOR SLB LEAK CONVERGE IN ABOUT 10,000 SAMPLES. RATE ACCEPTABLY RATE THE MEAN OR NUMERICAL DISTRIBUTION REPRESENTS OCCURRENCE (AT ABOUT

+

A LOW AVERAGE AK O 90% PROBABILITY PREDICTION INTERVAL)

DISTRIBUTION.STRONGLY INFLUENCED LEAK RATE BY THE RATES CONFIDENCE ON THE MEAN LEAK RATE EXCEEDING A DETERMI ASED ON 90%

AK EXPECTEDLY LESS THANBASED CORRELATION WHILE INTERVAL.

ON THE +90% PREDICTION EVALUATION OF THE FIELD AND MODEL BOILER FOR DATA THRESHOLD SIGNIFICANT LEAKAGE (> 1 LITER /HR)j~IS ABOUT '] AND FOR HO LEAKAGE THEg0LTAGE F0 IS AB t .

PAGE 38

__ _.--~--'-- ~ . - - - ' - - - ' ' ~ _ - - - - ~ - ~ - ~ ' '

INTERIM PLUGGING CRITERIA FOR UNIT 1, FARLEY NUCLEAR PLANT o

100% soBBIN COIL INSPECTION OF A TUBES '

o NO MORE THAN 200 BOBBIN VOLTAGES INTERSECTIONS WITH VOLTS, BETWEEN 1 AND 2 OF ODSCCCONFIRMED BY RPC, AS A RESULT FLAWS, WILL SERVICE BE LEFT IN o

AUGMENTED INSPECTION PROGRAM PAGE 39

4 e

l' INTERIM PLUGGING CRITERIA BASIS o 4.5 volts 3/4 & 7/8 i INCH I STRUCTURAL LIMIT (WCAP- '

13237) o 1.0 VOLT 99% CUMULATIVE PROBABILTTY FOR GROWTH OVER LAsT UNIT CYCLES 1 AND 2 o 0.7 volts 25% NDE UNCERTAINTY e

2.8 volts PLUGGING LIMIT l

PROPOSED INTERIM PLUGGING LIMIT 2.0 VOLTS PAGE 40 4

s

. i ,.

BASIS FOR INCREASED INTERIM APC VOLTA INCREASEDo TUBE BURST AND SLB LEAKAGE DA 3/4" HODEL BOILER e

e 3/4" BELGIAN AND PLANT R PULLED TUBES 7/8" FRENCH DATA ENHANCEDDATABASETODEFINg$lBLEAKAGETHRESHOLD e ,

THRESHOLD e FOR 2ERO LEAKAGE THRESHOLD

[IORNEGLIGIBLELEAKAGE 1.0 LITER HR. = 0.0044 GPM

-ADDITIONAL SUPPORT FOR NDE UNCERTAIN ,

, HISTORICALLY (1985-1992) $ MALL GROW UnrTS 1 AND 2 CONSERVATISMS IN SLB BURST ANALYSES

-LARGE NEGLIGIBLE SLB LEAKAGE MARGINS AGAINST BURST FOR VO o

7/8" DATAsASE l e O PRELIMINARY COM8INED 7/8" AND 3/4" DETERMINISTIC AND PR0sABILISTIC MARG xtson2sz PAGE 41 I - - ,,

st l

DATABASE APPLIED FOR INTERIM APC ASSESSMENT 1

VOLTAGE / BURST CORRELATIONS ,

e 7/8" TUBING: .

FARLEY CORRELATION e 7/8" + 3/4": EPRI (~FARLEY) + TOTAL 3/4" DATABASE SLB LEAK RATE CORRELATIONS

.e 7/8" TUBING: FARLEY CORRELATION e 7/8" + 3/4": CONSERVATIVE EPRI (~FARLEY) + 3/4" MODEL BOILER i

PAGE 42 onusonm i

MpureS2

Surst Pressure Correlatbn Whh nothin yo9

  • F 7

0 '

==

V PAGE 43

i 1

Burst Pressure Vsrsus-Bobbin Volto9e ,

_ s i

'E

.x m

6 5

e e

6 c.

e L

c3 mms.m Bobbin Voltoge. Volts -

S

.. PAGE 44 9 f

9 0 4

I e

i O3 9

.c Sb O T ^

Qd 3

$e, v$.

.c O "

Cr k '

.x

  • O 8' a, a J

CC (awl)60, 9

3 PAGE 45 .

_, c gw-v- - - - - - - - - - - - - -

ADDITIONAL HDE UNCERTAINTY EVALUAT"0NS CHANNEL HEAD HOCKUP TESTS WITH PROBE WEAR PURPOSE e

COMPARE VOLTAGE VARIABILITY FOR WORN EC ZETEC PROBES e

ASSESS PROBE REPLACEMENT CALLS FOR VARIOUS LOCATIONS OF WEAR STANDARD e

AcS!rss HDE UNCERTAINTY PRIOR TO PROBE RE BASED ON REQUIRING REPLACEMENT IF VOLTAGE FOR ANY NOLE CHANGES BY 15% FOR WORN PROBE. COMPARED THAT FOR THE NEW PROBE CONCLUSIONS 9

UNCERTAINTY FOR PROBE WEAR ESSENTIALLY T e FOR ECHORAM AND ZETEC PROBES PRIOR TO REP PROBE REPLACEMENT AT A 15% CHANGE IN A NOL VOLTAGE RESULTS IN AN NDE UNCERTAIK W STANDAR DEVIATION OF 7% FOR ALL MEASUREMENT's PRIOR TO PROBE REPLACEMENT 90% CHANCE OF PROBE REPLACEMENT AT PO e WEAR WNEN STANDARD DEV7ATION PEAKS AT 12%

PROBFS CAN BE PREMATURELY REFLACED DUE OF LEADS - DEPENDENT ON LOCATION OF WEAR STA AND EC FIXTURE TUBE LOCATION utousomn PAGE 46

_ _ _ _ - - - - - - ~~~~

-, .-. - . - . - _ . - _ - - . . - - - -. -..~. -- -_ . - - - ..-.- .

M9Ute 8 1g

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n oure 8 20 Bobbin Coll Amputude Dependence on Probe Wear u- Edcram Pmbe .

sp Wear t StandairJ n Vertoed T@e tratum .

1

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sp ............. . . . . ...1..... .. . ...n Channehead

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-t oses t am ene. war m ses em _ _ ams a _

un u- Zatec Probe m ,.............t Weer Star *rd Hontortaln Char.W.e.4 u . .............g.............I.............t............ :.

t

u. .........a .t.............;............ 4.... ..........;............. 7 .............!.............j!........... I S

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the SS PuskowarM WW SUS PAGE 49

Table 88 Channelhoad Mockup Probe Weat Standard Test Resuha -

Number of -

Number No. Probe Dif ference > occurrences of Voltage Tube Test --------------154 from New Probe (2)

Mcation Repeats Replacement Echoran Probe ------------------

(3)

.-- -- ------- Chances (1) .005 .0075

.0 tetec Probe (3)

R8C92

----- -- ---- .0025 .005

.0075 10 100 ----

0 0 0 0 R2C88 2 82 96 4

0 0 0 0 R33047 10 2 4 100 0 0 3 R3C45 0 0 2 4 33 0 0 0 0 R10C45 2 0 4 4 0 0 0 R23C44 0 0 10 100 4 0 0 0 R30C36 0 40-2 4 100 0 0 0 R3C16 0 0 2 4

' 4 0 0 0 R20C15 0 0 10 100 4 0 0 1 Notes: 0 0 80 1.

Number worn and new of testa probes. permitting comparisons of 4-hole voltages between 2.

An occurrence of voltage ditforence > 154 is ecch occur holes.

3.

absolute [(Vworn-Vnew) / vnew) is rence 15% that e4 for at le Dimensions the probe ce(nter~ng devices.0.005, etc.) are reductions in radius (i I

PAGE 50 t

l i t

1

FCure 3 21

, VoR494 Vertabilby Due to BobbM Probe Wear s- ~*4Mi':ll1m'.T. .':3 1

16 6s e- see " -

m 9 me aim e.ee  ; ,

le 13a g

g '

at

,g 41

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,, la PAGE 51 4

.. l ADoITIONAL NDE UNCERTAINTY EVALUATIONS EDDY CURRENT ANALYST VARIABILITY

SUMMARY

EVALUATION IN WCAP-12871, REY. 2  ;

e ANALYST VARIABILITY:

f 10% AT 90% CUMULATIVE PROR.

EVALUATION FOR PLANT L  !

e e 592 LARGEST BORBIN INDICATIONS (0.6 TO >3 VOLTS) 6 ANALYSTS FOR EACH INDICATION e

ASSESSED ANALYST VARIABILITY AS DIFFERENCE FRO e THE MEAN OF THE 6 ANALYSTS (592*6 = 3552 POINTS)

AT 90% CUM. PROS., ANALYST VARIABILITY IS 0.13 VOLTS OR 9.2% OF 1.41 AVERAGE VOLTAGE P

i

  • 28
  • 2 PAGE 52

1 rn

, a s 22. Exampes of Anayst vcriabilty lor Farley.1 Vonage Measurements FARLEY UNIT 1 EVALUATOR SENSITMT(

21% Population,32 Readings V(>1.50) ja -

. goo 12-MEAN A11.82 0- Dennee in Vens 80 I g MEAN A21.81 -

Moon 041 70 8-sit o w. o.13 @

i 6- 50 f

e .g 4

30 2 20 4

2- 2 1 1 1 1 1 1 0 ' i 0 E,E, , E , E , E , E ""

10 0.30 0.15 0.05 0.05 0.15 0

0.30 0.20 0.10 0.00 0.10 0.20 0.50 DIFFERENCE BETWEEN ANA1.YSTS (VOLTS)

FARLEY UNIT 1 EVALUATOR SENSmVITY 100% Population,151 Readings 80.

73 70 .

90 60 MEAN A1 1.15 omencein yons 80 l g, MEAN A21.14 Moen 002 40- ' std. Dw. 0.11 50 i 8 3o.

l 40 1

20- 30 10 20 l , ,

-0.30 0.15 0.05 0.05 .0.15

! 0.30 0.20 -0.10 0.00 0.10 0.20 0.50 t

OlFFERENCE BETWEEN ANALYSTS (VOLTS)

PAGE 53 i

l l

._. - . - - , . - - , _.. .. . . - _ . , . . . - , . - ~ . - .,

Fen 6 23. Emanpes of Andrst Varumy W F%.2 VofHee Meaanmenu a

FARLEY UNIT 2 EVALUATOR SENSITMTY 9% Population,23 Readings, V (>1.50) 12

-100 10- 90 unenA1 1.sco Devaan 40s 80

< 8-

,, , m e,% g ,, 70 g 6-50 8

4- 40 30 0- 'i i i i i i 0.5 4.15 0.05 i 0.05 0, 5 0.5 ,

0.25 0.1 0 0.1 0.25 0.9 DFFERENCE SETWEEN#M.YSTS MXTM FARLEYUNIT2 EVALUATOR SENSITMTY 100% Population,263 Reacings 140

100 120-ueen A1.ees Mean Dr. vans 40 2 80

<l# u,,n n, sin ud DevDr.vansatses 70 g

80 8* 50 lo 3

40 30 20 10

-0.5 0.15 0.05 0.05 0.15

+0.25 0.1 0 0.1 0.25 0.9 DFFERENCE BETWEENMW.YSTS(VOLTM PAGE 54

a,c4 e de h,5. uJ 4 L -m a 4 -ewSWw &.4 44 4mean.-.E.-Jnm i 44 -mm%+h p W . 4 4n AA AwaW,h 6 W4Jh.shmJ-__AAsa-.Wdem A h-,4 shas.44 4 a.si a de - dh 53.u mm Jm.Js 4 J.4 n a 6 rE-#Mr A;gr.,e4,4, 4

?

Distribution of

}vonage Indications Used lor EC Anet et t 1

1 PLANT L 120

.MEAN "

. 0 OF ALL'SIX -

ANALYSTS

~ 100

,, 101 r, 90 85 thht$ 1,41 * ,

80 -

=4n w e.a u

I60-J 70 80 8

50 -

g 30 201 , @

1 0, -

- 0.60 1.00 1,40

[22 . . .

o1 1 10 1.80 2.20 2.80 3.00- 3.40 v0 0.80 1.20 1,00 3.80

< 2.00 2.40 VOLTAGES 2.80 3.20 3.00 l

l PAGE 55

,e ,,.er-.,---.-ce,yw.,,,,,,,~,.mw ,-....:y,,----n,- .- .,,.,--.,r..y ........_v. ....c..w..-. , - - - . . ~ ~ - - . - - ~ * , - er,,-- . -_., .

, m . _ _ . _ _ . _ . - _ _ _ _ _ . . _ _ . _ _ _ _ _ . . _ . . _ _ __ _ _ _ .. -_._.. _ _ .-

\ l

.,. l Distritwtlon of Voltage Differences Betiveen Individual Ana s and Mean Values 4

PLANT L 1000-DISTRIBUTION OFAti DIFFEREN

,3  :  :

9@ _

too 7 ,

, = ":,- 1 ;;t" MZ g ~3..l sa - .. w 700 '

3 .,o e a - .. . ,

Ise se -70 5

u 0,

400- 415 -s0 a

h ae i em 171 40 30 e01 100- 107 1 -

120 20

' 4 LO F . g 74 72 10 l

5552I1

.i.oo 4.sb 4.26 4.i0 6.o6'. 6.16 656.sb io6 "

- 0.75 0.25 VOLTAGEDlFFERENCES 4.15 0.06 0.05 0.15 0.25 0.75 1 '

PAGE 56

. i FARLEY GROWTH RATES 100% #

BosaIN INSPECTIONS SINCE 1986 INDICATIONS AFTER EACH INSPEC  !

INSPECTIONS TO UPDATE. GROWTH HISTORIE '

GENERALLY e DECREASING VOLTAGE GR -

SIMILAR TREND FOR BOBBIN COIL DEPTH SIMILAR GROWTH RATES AND TRENDS SMALL AVERAGE GROWTH (<0.2V SINCE GROWTH RATES FOR B0C VOLTS >0.

THAN SMALLER INDICATIONS .

FARLEY-2 CALIsRATED TO LAn0RATORy STANDARD Oven 2 REPRESENTS FIRST USE OF e

NARROWER DISTRIBUTION, FEWER NEGATIVE GR VALUES AND FEW LARGE GROWTH CHANGES l

PAGE 57 muonm T q w p wr"t' 'T ~"1r-"W"W- PW'W--# Pr Wr-'w h &T1*T-'-w-WW4 M'r"u+W-4W-i1"?'--et'w'T3+wt---'7-p-M-M-r-7T'k-' <---~'Y'A- rv'#vtr***'--=+*"? 1 t M --AP "P-T***r* "T'P- t' +'+'- 8 T"t'>'TWF-"-$-PCT + --94'T-* G15-**'

VOLTAGE GROWTH PER CYCLE FOR FARLEY BOC No AVERAGE UNIT / CYCLE AVERAGE AVERAGE INDICATIONS VOLTAGE GROWTH _  % GROLITH FARLEY-1 1985-1986 123 0.45 1986-1987 0.20 45%

274 0.48 1988-1989 0.28 59%

431 0.62 1989-1991 0.22 36%

499 0.70 BOC <0.75v 0.16 23%

306 0.51 BOC >0.75v 0.24 48%

193 1.01 0.08 8%

FARLEY-2 1986-1987 291 0.55 1987-1989 0.13 24%

316 0.49 1989-1990 0.20 34%

326 0.71 BOC <0.759 0.10 15%

207 0.52 BOC >0.7by 0.16 30%

119 1.04 1990-1992 0.13 -13%

308 0.73 BOC <0.75v 0.11 15%

233 0.58 BOC >0.75v 0.13 22%

75 1.19 0.04 4%

l i l

i PAGE 58

, tutontsonm l

g --y,v w~s -- i,e y-

-- - , * , .-.-,.m-

Figur6 5-16 Historical Average Voltage Growth Trends in Farley SGs 90 -

80 -

N 70 -

! k 60 - -

50- -

  1. ~ -

c ~~~ ' , -

h 30-B n. -

E '

c-10-p ..--*- -- ---

-s . _

0 1984 1985 1986 1987 1988 1989 1990 /Ml i Beginning of Cycle. Year

---o---

Avera0e Growth Over Total BOC Voltage Range: Farley.

4. ,

Average Growth For BOC Volts < 0.75 : Farley.1 0-Average Growth For BOC Volts > 0.75 : Farley.1 i

--e -- Average Growth Over Total SOC Voltage Range: Farley.2

--* -- Avera0e Orcwth For 800 Volts < 0.75 : Farley.2

-- u-- -

i Avera0e Growth For BOC Volts > 0.76 : Farley.2 5 .

I i

PAGE 59

-, , . --- m,.m , - -- -

e

Fgute S-6 Suppon Plate in6 cation Progresdon in Farley.2 SGs so -

@g30-q --

3 g ............ - -

3o. . - . - - - - - - ....... . . . .

0- _

E -.g, 10 - - - - - - -

g ............,.

..- .m...... ......-.

50 .

85 to 86 .

86 to 87 .

87 to 89 89 to 90 INSPECTONINTERVAL L

W7 4

PAGE 60

Figure 515 Cumulalke Probability of Vohage Growth per Cycle k,t Farley Unds J. M. FARLEY UNIT 2 90 89 100% POPUl.ATION,327 READINGS 60-

-100

$1 50 90 44 OtFFERENCE IN Vol.TS

$ 40- g I, ooh $4s 30'

  • ag g vot.Tso 0.74 #

23 voi,7s, o rg m 20- 17 40

$ 3o E

  • 'I iiiiii 20

='

0

  • a 1.0o .0.25 o.oo 6.2o o.4o 6.ao 6 ao ' 2'

-o.so 0.10 0.1o 0.so o.so 0.7o 1 2.s DIFFERE14ES IN VOLTS J. M. FARLEY UNIT 1 91 - 89 100% POPULATION,499 READINGS 1 *- "

l, .904

./ =-

m,,, ..

m _ ,.e _ - .

G 60 50s sTDDCvcJe

.,0 60 l

50 8 .,

5*

.:o l2> -

17 -

,,,, e 2d nii.0; *g 0.80 b.25 o.00 6.26 ..b 6.86 6.8 '1'

.O.50 -0.10 0.10 0.3o 0.50 0.70 0.9 1,6 DIFFERENCES IN VOLTS PAGE 61

. \

Floure 514 CumulatNe Probabmty of Voltage Growth per EFPY lor Farity J. M. FARLEY UNIT 1  !

SUPPORT PLATE DEGRADATION PROGRESS II lIi lil l I !IWil I*" IiliiI I iill# i F

  • IT't i 1 i l i //liI l

" [ ji i

l It i l i F; 7il l l{ i II1llii Ih i lI i i I .i lIil l i l /l iliiii l I 1/ !

i i /l! L IIi j I 1 i

" ll l ,1 l i18Iill i I i

i

  • IIi ll l / i l lt I ii1 i 3 I-l 1 M i l ll l F
  • 4.o is aa.s.1.anassese.staan o;s o.s os' osl in a a ~

1 CHANGE NSIGNAL AAW'UTUDE #4PPV) r..., *  !

J. M. FARLEY LNIT 2 - .

soo SUPPORT PLATE DEGRADATON PROGRESSION 1 l = = =

M~ l I

[ 1i Il V4 i i I i i i I i

)

iI i

I i

i f/ l ) l- 1 I II i I/f i i  !  !

I;[*

I tii ,

// I ii o I

l ~l L

~

Il l Al l I ,

I I I -l l 7f II l-- 1 l l 1 // ' IMete-Iff2 l I;[ '

e g,,

t I!M/9

,tr> l 1 IIi I l II I

I l

i i I

I-l i

4,, ,,, ,,- 3, 9 48 44 On 0.4 os-9 1.1 1s 2.0

- CHANGE _ .NSONAL AMPIRUDE NAIPM) i . ._ i PAGE 62' eS r, -

--. - <.-e n- r w , .er- . - . ,,n ,,--v, .r

F,tgure 2.

- 1992 Farley 2 Total Indications Found and e L.efi in Servic J.MFARJYUNIT2. AL,3.Q's 2 All1992 totbn hdcatons

& W -f

~

e  ! 1 s 33 j f a j>j 1 "h swho ss t ,,

- j ,

l .

I gp 14 p ,

t i

' l a

? o f4 3 5 <4 4 C'  :

0.3 03 0.7 0.9 1 .1.

1.3 .13

.'.14^ ..

h. b 0.4 0.0 0A 1.0 1.3 a.s 3A4 12 1.4 1.0 1.0 L4 24 tottm votage J.M.FARJY UNTT2. ALL S.Q!s  :

Sc 1992 Bottan becatonsleRin seMoe

,7 e ' ,

4

,, $r?ae 29 .

20" tt 14

& 1 4 4 C:

0.3- . 0A . ...... 0.7 OA 0

0 0 /,0 1.1 1.3 .13.

0.4 0.8 1A Lt LS 3A4 OA 1.0 12 1.4 1.0 10 L4 1A bette Votage PAGE 63 c-y 1+evt-- p - 9 wig 'w w th w-i.-my,-gy rvw. q s-5 -.w--q'rM7e-- +t--r-w-tw-4~-- T9 e- -- -

-ry-P-

_ _ _ _ . _ . _ . _ . _ . _ _ _ _ _ _ _ . _ . _ ___ _ _. _ __._ _ __ _. _.._._._._.___.___ m___._

l

, Figere 4 l

. Farley 2 Voltage Growtn*WGyrre'from 1990 to 1992 i

l si r 7 .  ;

- ' ej g$g w.Y.,

nl~

!" "J;;,*

, y ~m *j 3

iDa ,/

  • O a

LAY -

) A .

bbE' t 1

4. - -

,, u jo. j or$shbri ,, Vem,e u ,,.. j ..- , , i .. -

Ome .

ek yeen 80 n

-s

=1 Sb

2. *r.*

i e j Y...m j* 3P'

. g i 1 d e VA 11 4,.

48

. .. 4.1 . . . .

.y. .. .

1- 1 0.1 0 g RF 14 11

, "t2LYlM6W* - = - ,,,

3>

ik Tw*""

=ames "n g W.*

i

dddda a

. -,j.qco-,, takhsiVehgs -

.r,f o co- ,

M

- , ; m- ,, -

PAGE 64

~

., .%,--o,.v,-,.. ,-,.-.,---,,-,.e.... , ---r---,--,.-- <-,.,,---,w,4-- . - , .y- --, -~. w+.

80 1. 1 ua voer4as em

- .70 -

O O> .

60- ..

h50----C-4  ::

g  : -

M 40-...i ' . , I 3o.

t

$ 20-yy+ 4.....,

b

> 10-0 ,

o i 2 3 4 5 6 INITIAL BOBBIN AMPUTUDE, VOLTS O FME2Y 1 E FARutY.2 & PLANTF X PL# # H.1 Fgure 612. Average Percent Voltage Growth Rates for Farley, Plant F and PiarW H 1 I

l-l l

PAGE 65 4

h

- - - - - - , . , - - .. , . + . . - _ . , _ . , - . - , , .

4 CONSERVATISMS IN SLB BURST ANALYSES SLB A P = 2650 PSI APPLIED COMPARED TO AC SLB A P OF 2560 PSI ASSUMES NO OPERATOR MINUTES BURST CAPABILITY EVALUATED AT LOWER 95 MATERIAL PROPERTIES FOR ALL TUBES IN THE BUNDLE ALL e TUBES ASSUMED TO BE UNCOVERED BY TS e CORROSION OF TSPS EXPECTED TO PREVEN ANALYSES REQUIRE ZERO FRICTION AND SIG e TUSE TO TSP GAP FOR UNACCEPTABLE TUBE DI EVEN WITN ZERO FRICTION, ONLY PERIPNERAL TURES UPPER PLATES ARE UNCOVERED DURING EVENT BURST PRESSURE VERSUS A THRUWALL CRACK OF a.c CRACK LEFGTH COR t

- REQUIRED FOR TURE BURST EXCEEDS TSP THICKNESS OF 0.75" l

l i

PAGE 66

\ otostsonm

e * *

SUMMARY

OF SLB LEAK RATES AND M EVAtuATED BOC '2.0 AND 2.5 volts AGAINST a

AND 3/4" DATABASES

SUMMARY

EVALU 0

LAPGER MARGINS BASED ON 7/8" DATABA BunsT MAnaINS o AGAINST 34 P EVALUATED (2.92 3.5 VOLTS) AT 90% cum. Paos. ON E0 B0C =,2.0v: MAnGIN oF'. ,

j ',

0 B0C = 2.5v: MAnGIN oF I AGAINST SLB

]8 EVALUATED (3.5, 4.12 VOLTS) AT AND99% -99% CUM.

PREDICTION Pn0s. ON E0 B0C = 2.0v: INTERVAL MARGIN OFl, FOR ' g 6

BURST AT JL L - M.C. Paos. , = 4x10-C, B0C = 2.5v: MAnGIN OF i N.C. Pnos.'= 5x10-s~,

l PAGE 67 i

,. g-mm m.1.my-- -m--w~rr*=-2g. 9: -4e-- r w e-

SUMMARY

OF SLB LEAK RATES AND MARGINS AG SLB LEAKAGE e BOC = 2.0v: MONTE CARLO = 2.3X10-4 GPM PER INDICATION r

DETERMINISTIC =,,

79 '

) -

-8 MINIMUM OF ~220 INDICATIONS FOR 1 e

MONTE CARLO ~4000 INDICATIONS FOR 1 GPM BOC = 2.5v: MONTE CARLO = 5.2X10-4 GPM PER INDICATION t DETERMINISTIC =

J s

- r ,,g MINIMUM OF ~105 INDICATIONS FOR

- ~

e MONTE CARLO ~1900 INDICATIONS FOR 1.0 GP DETERMINISTIC AT +90% PREDICTION INTERVAL EXPECTED TO BOUND MONTE CARLO WITH POTENTIAL FUTURE INCREASES IN SLB LEAK RATE CORRELATION wrostion m PAGE 68

FARLEY UNITS 1 AND 2 DEPENDENCE .

OF MONTE CARLO ANALYSES SLB LEAK LTAGE RATE L

B3C

-VOLTAC,E SLB LEAK RATE (GPM)EOC VALUES i

-7/8"+3/4" (~7/8") DATA-7/8" DATA BURST PROBABILITY 7/8"+3/4" DATA (3) 1.0 -

L4 1.5 2.0 ,

2.5 3.6 L

J NOTES:

1)

!!,/ LEAK RATE AT 90% CUMULATIVE PRO 104

2) MONTE CARLO SAMPLES.

ZERO REPRESENTS NO OCCURRENCES CARL 0 SAMPLES.

5 HONTE whenm PAGE 69 y- w y y- --,,y

f DETERMINISTIC SLB LEAK RATE AND BURS

. .. ' t t

i 1

7/8" DAT***SE PRELIMINARY 80C volts 7/8" w 3/4" DATABASE  !

2.0 2.5 i 2.0 2.5 GnowrN AT 90g)

Cun.Paos. (

0.6 0.6 ' i 0.6 0.6 i t

IDE UNC. AT i 0.32 0.4  !

90% Cun.Paos. 0.32 0.4 t 1

EOC % Wes i

. E 2.92 3.5 3 2.92 3.5

. 3i8. tux RATE (GPn) ~

o 390% ON MEAN 7 I e A9*t om enco. int.

i 'i volts rok 3AP i

AT -95% PaEn.

' INTERVAL ~

i ,

Il0TE 1. .

c. FAaLEY UNIT-2 ron 1989-1999.

3In LAsr 5 Uurr 1 Ano 2 cycles. LAaGEST GROWTH AT 90%  !

1 DETERMINISTIC SLB BURST MA8tGIN EVALUA t

7/8" DATA PRELIMINARY BOC volts 7/8 + 3/4" IATABASE

2. 0  ;

2.5

, 2.0 2.5 I SaoWTH AT 99% 1.0*

cum.Paos. 1.0*

1.0* 1.0*

NDE UNC. (25%F 0.5 AT 99% cum. 0.62 0.5 -0.62 Pnos.

E0C volts 3.5 4.12 3.5- 4.11 VoLis ron SLB Bunsi ' 11 AT -99%

Pata. INT.

EVEN APPLICATION oF ,

HTSTORICAL FARLEY DATAT WoOLD MARGINS.

SURsf W l

l l

l L

L l

l PAGE 71 '

is M<ger yN-TvS c"&y? ?w T"-sr + a-y-,. -w-y ww w- w,.i-f9-M- m- -

my+p,g.,g-wa,w--w.g.pp,, , , , ,gie -,,g w,+ , = - - .-e y m- - ~ +-g ,-

-G w,, ^tf-,aoi y

. . ,. i t

1 4

PROPOSED INTERIN APC 80stIN INDICA 120NS TUse REPAIR. Less THAN OR EQUAL TO 1.0 v0LT 00 NOT Rt0UIRt As0vt 1.0 VOLTS, noss!N  !

FLAW SIGNAL $ NAVING CONFIRME0 RPC +

AND 2.0 VOLTS. INDICATIONS SHALL RE LIMITED TO 200 IN ALL s0ssIN FLAW INDICATIONS A80v' e 3.6 v0LTS WILL st RE 1 EOC SLB LtAK RATE ANALYSIS IS NOT REQUIRED 0

LIMIT ON NUMBER OF INDICATIONS CON $tRVATIVrLY L LtAK RATE TO < 1. 0 GPM IN LOOP WITH POSTULATED PIPE RUPTURE.

. i i

i r

4 PAGE 72 ws,- . .-,n.- ,-e,+~ v -- - - . - , - - + - - - - , - - .---,~.,,,-,-.~,+mv-,,w. ---se,,--,neo,,- -,w--.--,e------,,,, - - - - , e,w+i--- >rr-e,w,- < r e v r- e, ys - -

e g4

s A p i

SCEEDULE IPC IPC Subelttal Meeting to Nac FMP Unit 1 27th cubge start 28th 25th 7/27 '8/3 8/30 8/24 8/31 9/7 9/14 i

9/21 I

~

i l

\

o (

n ,

m i U ,

i 3

I SG EC 4

Starts SG Repeir/ i

. Plugging starts  !

1 Sth  !

i

9/28 10/5 10/12 10/19 5

10/26 11/2 11/9 -

I t

1 r j

i 1

INTERIM PLUGGING CRITERIA BASED ON: _

WCAP-13237, PRELIMINARY DATA ON VOLTAGE 3/4 INCH

/ BURST / LEAKAGE OF DIAMETER TUBING FOR ODSCC AT TSPS WCAP-128i.,

REv. 2, FARLEY APC t

PRESENTATION WCAP PAGE 74

_____~.s--- " - " - - ' - - ~ - _ _ _ . , - - - - - - - - - ' - ' - - - ' -'

1 e

i.' .

QUESTION 14

$TATUS OF EVALUATION FOR 3/4" TuaE MODEL BOILER DATA COMPLETE PULLED o-TUBE-EVALUATION-IN PROCESS 3 PLANTS (BELGIAN E-4, R, B1) e 10 BURST INDICATIONS e

e 9 SLB LEAK RATE INDICATIONS PRINCIPAL ISSUES TO BE FINALIZED VOLTAGE RENORMALIZATION OF BE '

VOLTAGES TO APC NORMALIZATION 550/130 AT KNZ MIX ADJUSTMENT OF BELGIAN ROOM TE RATESe TO OPERATING TEMPERATURE CON BELGIAN MODEL' FOR ADJUSTMENT REVIEWED-ACTIONS TO COMPLETE e

RESOLVE BELGIAN VOLTAGE' NORMAL RATE ADJUSTMENT e

EPRI TASK TEAM REVIEW

'8082t078292 PAGE 75 o

f

- -.- . . , . - , - , , . . m-., . ., . ....~ - - , . . . . , _ _ _ _ ~__ . _ _ _ _ _____ _ _ _ _ __,___- __

i

. 1

\

SLB t rtA Ra te Versus Bobbin Vol tage 9

I em i

i l

PAGE 76 l

I .

l

BELGIAN VOLTAGE RENORMALIZATION. >

BELGIAN FIELD IVALUATION 4

EVALUATION OF 53 INDICATIONS INCLUDING 1992 PULLED TUBES 4

MEASUREMENTS AT 300 KHZ WITH BELGIAN PR 9 EQUIPMENT AND BELGIAN NORMALIZATION MEASUREMENTS AT 550/130 KHZ WITH APC NORMALIZATION AS WELL AS 300 KHZ WITH BELGIAN PROBE AND ZETEC EQUIPMENT S

VOLTAGE RENORMALIZATION FOR BELGIAN PROBE DETERMINED 300 KHZ BY CORRELATING- 550/130 KHZ WITH '

SLOPE OF 4.93 o

FIELD DATA INDEPENDENTLY REVIEWED BY W

, WITH CALLS EXCELLENT. AGREEMENT WITH BELGIAN VOLTA PRINCIPALe ISSUE OF VOLTAGE RENORMALIZATION RATIO 0F 550/130 KHZ TO.300 KHZ OBTAINED WIT U.S. PROBES IS FACTOR O' 1.5 TO 1.75-HIGHER OBTAINED WITH BELGIAN PROBE.

B BASED ON ASME~ STANDARDS U.S. PROBE AND LABORATORY TRANSFER STANDA 1

PROVIDED 70 LABORELAC FOR INDEPENDENT EVALUA ,

turoazionm .

PAGE 77 a ,- --n e- e - - v-

e

.-4

'l Ratio of U.S. 550/130 KHz to Belgian 300 KHz r seemsnrF ,

Kea __ g Prake Isme A9E seteten  !

lgs

  • tat.

flanggr( Asa 4 tu g g g 4 su g

3,2 %

g g,g2S 9.92F SSO/tM 2etec sers-mag. 9.04 SSe no 9.967 '.

teh 2.FS 2.42 389 4.13 4.54 i 3.93 3.14 4.1F 4.1T 4.tr ,

le.t 8.M 3.M 8.H 3.Se SSO/tN tc9te. G.66 tS.F :

Reg-btes 0.52 158 Tee tab 2.0 "

2.75 2.51 308 4.11 4.81 3.86 3.9; 4.s4 4.18 4.43 554/138 5.88 4.51 3.F2 (che, 9.42 0.62 -

SSe mee blot Tee 8.55 transfer 2.0 3m m. 2.M -3.14 4.23 3.ar S.43 rn 3.42 4.31 S.11 38.4 S.22 y ,$56/930 ..a ... .$ ..F2 4.se 14. 8 08 Setofm SSO

  • Vee .. 3 2..

setelm 2.75 300 2.30 ' 3,1T 3.S F 3.63 3.89 2.91 3.31 - 14.32 3.49 2.90 0.9%. S.F2 8.79 8.FF 9.14

4.S9 Seale 154#130 (APCB to 338 W '~ 2.8 Roter wase no i

tab 3.39 4.e3 S.99 iche. Neo-bles d.m  !

Tee g,gg '

tab ,,gg 4.es 4.92 Ec8h*. a.ae F.ps Ase-bles ' Tee g,yg teensfer 4.32 S.38 4.S$

Seletest F.82 ree golplan 3.FS 9.3s 2.93 3.4F 4.91 4.73 3,yg S.14 1AP200 tref 2192 y' y ~

r . , , , - ,e.e

9 FIGURE A2-1 .

g '

3,S/G:3 l_

18 Evaluation of 1992 Voltage Ind. at TSPs

}' 16- i No. Data Points 53 '

a g 14- 1 EC Equipment- MlZ18 j

) -

3 g12 -

t O

g N10 2

O 0

8- ( Linear Regression 3

<c Slope 1.00 4 6- Intercept 0.07 I

y Std Dev. 0.004 o

e 4- R Squared 0.999 C

\

8 to 2-04 -

0 2 4 6 8 10 12 14 16 550/130 KHz, APC Mix Norm, Belgian Eval

. ~

3 3n 7

)

o .-

i3 s 51

7. 2 29 .

r s9000 e4 g -

d

- e R

t p v. er _

5 P

s r ecee au aprDq -

2 S E eo edSl t nt T nSiSR .

l t

U a v

Ba =

d

" ( ( E n

Gn

/I .

2a i g

Se g .m=

l e

9 ,

. ,a ._ B

~t l

2 2

o == -

m E

A V = .

o r

5. N R 2 .

1 U

G I

9 9 " a=e n

F 1 "

i a

g f = - l o .

e n h ) m 3 B

o 5 z i

8 na . 1 H

[tau 4 t

s 1

Zg i

K l l nt oenMeB l

a i = .

0 v = 0 E Pm0 tai3 p 3

a u1 q/ .

5 De00 50 0

o 'C 53 NE .

( ( .

6 4- 2 0 8 6

- - - - , 0 1 1 1 1 4 2 2-B ni i& cHnc EOz y 00<-c NIM oov- - -

m g"='

4

1 .

.. ~

FIGURE A2-3 ~

9

~

L 3 S/G: B 16 Evaluation of 1992 Voltage ind. at TSPs Tu

& 14-f 3 E No. Data Points 53 63 12- EC equipment T) '

m 550/130 - MlZ18

- 10. 300 "

E O

( - MlZ18 ) = f Z 8-A

.2s 2

( Linear Regression

. D e

o 6_

Slope 4.67 n.

< 8 " Intercept -0.64 4-y Std Dev. 0.06 M

o e>

2- ( R Squared 0.991) c g o.. ....

no .. ......... ................. ............ ..........................

0 0.5 . . .

1 1.5 2 2.5 1

3 3.5 300 KHz, Belgian Norm., Belgian Evaf.

" .\

, S/G: B -

Evaluation of 1992 Voltage Ind. at TSPs 10 N

y U.S. Probes

, x 9- unear Regression Slope .061 su I o g Intercept 2.94 am b 8 -[ Belgian Eval. ] [UnearRegressionBelgi Std Dev .003 R Squared.985 as n Probes ]

.M 55W130 MlZ18 Equip SW .029 k 2 7_

300 KHz Belgian Equip Idag 2.34 j g Sid Dev .001 O. R Squared .997 l Linear Regression l

<C Slope .027 N 0~

s 1 fntercept 2.37

\

[ y Std Dev .009 O O

~ R Squared .183 0 0 5- m 06'O m t

??

B . O O

$ 4- 0 0 0

}% 3- 0 O 0% 00 O

[ O O

O 2 , ,

0 20 3O 4O 5O do j0 8O NO 100 DEPTH (%)

m

Preliminary 16- Correlation APC 550'130 to Belgian 300 kHz (3/4' Tubing) c.

l4 "

7 .

3 Field Data toints e 45 3C equ13mment g I2' 150/130 . ICI510 300 . Selgia.a

      • '***** a f 10- (  ;

2 _ ,

5s ,

slope 3.5 . , ,

{@

R No"Te!wett, (388 M83

  • a e "

gi3 ,y g.gy,,,g,.

simpe 4.93 4 3 8*

  • I 8 g 8

2atercept 0.75 4 4- j[a std Dev. 0.21 8

(

1 squared 0.927

)

ul 0J

=

0 0'.5 1 13 2 25 3 300 kHz, Belgian Norm., Belgian Eval.

70 Correlation APC 400/100 to French 240 kHz (7/8' Tubing) 60- r

' en Model no11er Data Points a 10 m m1 - -- -

50- e x

N 3 f Linear negreeston e

@ 30- r ,l ,p , 4,,

7 slope 7.82 -

latercept 0 1stercept 3.25 h, 2a. nangea 0400.40 u,,

volta Std Dev.

- R Squared 0.34 0.985 v J i

4

> 4 .

3e .

0 .

0 1 2 3 4 5 6 7 8 9 Volts . 240 kHz French Norm.

t Figure 6-5 voltage Renormalization Correlations for French /Balgian 7/8" Lata and Belgian 3/4" data PAGE 83

CONSIDERATIONS FOR COMBINING VOLTAGEe ADJUSTMENTS o

ADJUSTMENT (1.36 FACTOR) FOR SC ASSESS WNETHER APPROXIMATELY e

EQUAL CRACK LENGTNS ARE OBTAINED FACTOR ADJUSTMENT .

FOR BURST CORRELATION ADDITIONAL ADJU)TMENT FOR NO LENGTN = (R+t) 8 INCREASES 3/4 VOLTAGES BY ADD FACTOR TOTAL VOLTAGE ADJUSTMENT FOR BURS COMPARISONS = 1.59 e

FOR LEAK RATE CORRELATION SCALING FACTOR OF 1,36 BURST e PRESSURE ADJUSTMENTS i

e 7/8" FLOW (147 STRESSADJuSTMENTS KSI) F

, ., g

REDUCES 3/4" BURST PRESSURES -

a BY F SLB e LEAK RATE ADJUSTMENTS

! TEST AND ANALYSIS INDICATES 3/4" LE e

.LENGTNS GREATER TNAN 7/8" .gLEAK RATES FOR EQ ,

3/4" LEAK RATES REDUCED BY ANALYSIS RESULTS FACTOR BASED ON' i

P2082:072292 PAGE 04 4

I' VOLTAGE NORMALIZATION FOR 7/8" AND 3/4" TUBING VOLTAGE CALIBRATION e

4,0 VOLTS ON 20% DEEP, 0.187" 4 TW HOLE ASME STANDARD AT 400 (550)* KHz -

e ,

2,75 VOLTS ON 20% DEEP, 0.187", 4 TW HOLE ASME STANDARD AT 400/100 (550/130)*- KHz 7/8" TUBING AT'400 KHz, 3/4" TUBING AT 550/130 KHz e

BOTH STANDARDS USE SAME, UNSCALED HOLE SIZE SCALING CONSIDERATIONS e

TUBE SIZE; FREQUENCIES-AND PROBE DIAMETERS ARE APPROPRIATELY SCALE e

PROBE COIL SIZE AND SPACING NOT SCALED - NOT -

EXPECTED TO BE ESSENTIAL e

SIGNIFICANT SIZE LOSS OF SCALING BY USING SAME HOLE-ADJUSTMENT STANDARD TO 3/4" VOLTAGES FOR HOLES SCALED F 4

VOLTAGE PROPORTIONAL TO HOLE DIAMETER SQUARED-CONFIRMED BY VOLTAGES MEASURED FOR SCALED TW HOLES e

7/8" TO 3/4" DIAMETER RATIO - .17 e

3/4" v0LTAGE ADJUSTMENT = 1.17 = 1.36 FOR COMPARING 3/4" AND 7/8" DATA tap 2063:072292 PAGE 85 3 '

r -

IIj 4 g'

  • e

[

v b~

t j

?!

~

w E

E w

b a

i l

l l~

CRACK LENGTH (in.)

Figure 3.5-11. Leak Rate Versus Crack length at AP = 1550 psi for Nominal and Thinned Tubing PAGE 86 l 6955B:1b/082283 l

(.

L

SLB. LEAK RATE COMPARISONS ,

CRACKFLO CALCua.4TIONS TUBE ~ AVERAGE UPSTREAM NOMINAL ~ NOMINAL SIZE STRENGTH

  • UPSTREAM BACK MEAN TuaE TueE-Watt (IN.) (KsI)

TEMPERATURE PRESSURE PRESSURE RaozuS-

-(DEG. F) i _

_(PSIA)- _(PSIA) THICKNESS-(IN .')

7/8" 68.8 (IN.) _

577 2650 15 0.4125 3/4"- 0.050 77.7 577 2650 15 0.3535 0.043

, 7/8" 3/4"

$ CRACK LEAK LEAK

$ LENGTH RATE RATE

--(IN.)_ __(GPM) DIFFERENCE

_(GPM)

__(PERCENT) 0.1 '

0.2 - 6.38 1

0.3 -14.40

-21.02 0.5 -21.55

-20.95

  • ONE-MALF or FLOW STRESS i

.i a

f '

k s-s s s I Q.lSTRIBUTION:

Docket file NRC/ Local PDRs l PD 11-1 Resding

1. Murley F. Miraglia S. Varga G. Lainas E. Adensam S. Hoffman P. Anderson E. Jordan OGC ACRS (10)

J. Wechselberger 17-G-21 -

J. Richardson 7-D-26 J. Strosaider 7-D-4 G. Johnson 7-D-4 E. Murpt.y 7-D-4 H. Conrad 7-D-4 K. Karwoski 8-R-23 3 R. Jones 8-E-23 J. Cunningham 10-0-4 K. Eccleston 10-0-4 K. Campe 10-E-4 S. Long 10-E-4 E. Hackett NLS-217-C J. Muscara NLS217C L. Marsh 13-D-18 J. Stang 13-D-18 R. Assa 13-E-16 J. Winton 13-D-18 L. Plisco, EDO 10-A-19 N. Economos, R-Il E. Mershoff, R-ll cc: Licensee & Service List bbbOd, 1

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