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Correlation Between Yield Strength & Time to PWSCC for Alloy 600, Presented at 1992 EPRI Workshop on PWSCC of Alloy 600 in PWRs in Orlando,Fl on 921201-03
	ML18059A424
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Site:	Palisades
Issue date:	12/01/1992
From:	Woodman B; ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, ASEA BROWN BOVERI, INC.
To:	;
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ML18059A421	List: ML18059A420; ML18059A422; ML18059A423; ML18059A424; ML18059A425;
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CORRELATION BETWEEN YIELD STRENGTH AND TIME TO PWSCC FOR ALLOY 600 PRESENTED AT THE 1992 EPRI WORKSHOP ON PWSCC.OF ALLOY 600 IN PWR'S ORLANDO,FLORIDA DECEMBER 1-31992 BRIAN W. WOODMAN r CONSUL TING ENGINEER ABB-COMBUSTION ENGINEERING NUCLEAR SERVICES

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1986 FIGURE 11 CHRONOLOGY OF RECENT PWSCC EVENTS INDUSTRY EXPERIENCES 600 PWSCC (HIGH YIELD STRENGTH MATERIAL)

(MANUFACTURING DEVIATIONS}

1987 YGN SPECIFICATION REQUIRES LOW YIELD STRENGH AND RESISTANT METALLURGY 1991 CEOG DEVELOPS INITIAL RANKING FOR*.*

PWSCC SUSCEPTABILITY:

50 KSI MAX YIELD STRENGTH 1850 °F MIN ANNEALING TEMP SEPT '91 EdF CEDM NOZZLE CRACKING NOV '91 -

PALO VERDE REMOVES NOZZLES:

FEB '92 MAR '92 APR'92 APR'92 APR'92 HOT LEG NOZZLES (72 KSI)

PZR NOZZLES (52 KSI)

SONGS REPLACEMENT NOZZLE CRACKS LOW YIELD STRENGTH (38 KSI)

YGN NOZZLE DATA RECEIVED FO-R REVIEW PROBABALISTIC FAILURE MODEL DEVELOPED AND CORRELATED TO CRACK DATA (MORE RESTRICTIVE CRITERIA)

ABB-CE DECISION TO REPLACE

CORRELATION ANALYSIS

PRESSURIZER NOZZLES

TUBE MATERIAL

THEORETICAL MODEL

I ALLOY600

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FIGURE III.2 TIME TO FIRST FAILURE SURFACE FOR ALLOY 600 FORGINGS 650 YIELD STRENGTH - KSI 76 590

. 600 OPERATING TE_MPERATURE OEGF

Cl) a:

I

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H I-40 20 TIME TO FIRST CRACKING VS YIELD STRENGTH CE PRESSURIZER NOZZLES Fitted Actual

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36 46 56 66 76 YIELD STRENGTH A600 BAR 653 OEGF

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365 OEGC TIME TO CRACK INITIATION VS YIELD STRENGTH -

NORRING DATA Fitted Actual

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35 40 45 50 55 60 YIELD STRENGTH -

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TIME TO FIRST CRACKING VS YIELD STRENGTH CE PRESSURIZER NOZZLES 1.00 90 80

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0 35 40 45 50 55 60 65 70 75 80 (Zl~t,i,pA c

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YIELD STRENGTH -

KSI 653 OEGF

Theoretical Model Traditional PWSCC t1 = ca-4 exp(Q/ RT)

Creep Rupture

!/!, = C2 c

t =_1...

I C.

£ = c3 exp( ~~)exp(~;)

where exp(~;) is approximated by (JN Nln (j = V<J RT Ina =-v-=CONSI'ANT a

NRT Regression Analysis 35 ~a ~ 60 KSI N =3.75 Constant Activation Volume Constant Temperature

WEIBULL FAILURE MODEL

EST/MA TION OF PARAMETERS

SHAPE - EST/MA TED FROM 61 KS/HEAT (ALL CRACKED) : 6.0

SCALE - EST/MA TED FROM 36 KS/HEAT

( 1 CRACK)

119 X1a3 EFPH

FOR OTHER HEATS - SCALE ADJUSTED BY SIGY3*5

DEVELOPMENT OF EXTREMAL MODEL

PARAMETERS OF EXTREME VALUE DISTRIBUTION OBTAINED BY SIMULATION

MINIMUM FAILURE TIMES FOR GROUPS OF 7

EST/MA TION OF FAILURE BOUNDS FOR FIRST CRACKS I ALLOY600 MN M

E XTRE l~E VALUE D I S-l H I BUT \\ o N SIN-I HES!S BASR L r-l\\1LURE MODEL P;(t) " I - FXP(- C-b )ri,)

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30 40 50 60 70 80 YIELD STRENGTH -

KSI

ASSUMPTIONS APPL/CATION TO CRDMLIFE PREDICTION ANALYSIS

25 NOZZLES AT RELATIVELY EQUAL RISK

APPLIED STRESS APPROX/MA TEL Y 125% OF YIELD

WEIBULL FAILURE MODEL

50 KCAUMOLE ACTIVATION ENERGY

50 KS/ MATERIAL

36 KS/ MATERIAL I ALLOY600

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ML18059A424

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