ML18059A424

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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
Person / Time
Site: Palisades Entergy icon.png
Issue date: 12/01/1992
From: Woodman B
ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, ASEA BROWN BOVERI, INC.
To:
Shared Package
ML18059A421 List:
References
NUDOCS 9310120438
Download: ML18059A424 (16)
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Text

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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
    • 'I
  • I ALLOY600 r *9a1012043a 9a1007-.,- :\

i PDR ADDCK 05000255 I1 : .

S. *

FIGURE 11 CHRONOLOGY OF RECENT PWSCC EVENTS 1986 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 HOT LEG NOZZLES (72 KSI)

PZR NOZZLES (52 KSI)

MAR '92 SONGS REPLACEMENT NOZZLE CRACKS LOW YIELD STRENGTH (38 KSI)

APR'92 YGN NOZZLE DATA RECEIVED FO-R REVIEW APR'92 PROBABALISTIC FAILURE MODEL DEVELOPED AND CORRELATED TO CRACK DATA (MORE RESTRICTIVE CRITERIA)

APR'92 ABB-CE DECISION TO REPLACE

CORRELATION ANALYSIS

  • PRESSURIZER NOZZLES
  • TUBE MATERIAL
  • THEORETICAL MODEL
  • I ALLOY600

FIGURE III.2 TIME TO FIRST FAILURE SURFACE FOR ALLOY 600 FORGINGS 1.20 1.00 Cl..

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I *60 lL.I

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I-40 t.LI L

I-590 20 . 600 0

OPERATING TE_MPERATURE 650 YIELD STRENGTH - KSI OEGF 76

TIME TO FIRST CRACKING VS YIELD STRENGTH CE PRESSURIZER NOZZLES Fitted Actual

.100 80 .......................... ;......................................................:............................ .

Cl) a:

I ..........................................................: .....................................................:.....................................................:..................................................... :-***

60

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~ ~-

0 ***r**************************************************+**************************-*************************l**************************-****************-*********l************-****************************************j****

36 46 56 66 76 A600 BAR 653 OEGF YIELD STRENGTH

TIME TO CRACK INITIATION VS YIELD STRENGTH - NORRING DATA Fitted Actual 20 ----:****-***-****** **************-******-**-*-~*-****-***-** *******--*************---**-!**-****-******- *-****** **-**-****-*-****r***-****************-*-**--*--************* *******-**-************* *****-********-*****

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  • 0 ****~-*-**************************************+****************************************+*****************************************~****************************************+****************************************+***

35 40 45 50 55 60 YIELD STRENGTH - KSI 365 OEGC

  • TIME TO FIRST CRACKING VS YIELD STRENGTH CE PRESSURIZER NOZZLES 1.00 ****:-*****-*** ............ L......................L.......................i .......................L......................i.......................i....................... i.......................i. ...................... t ...

90

+ '.  ; ~~r ; ; - I  ; i _:

80

+ . . +Lf~ + -1 i T . -*

70 r ' ' -' -r- -' -* - ( . - -,-

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  • t* * * * * * * * * *
  • trc=* *A*Y-~ -~- ~-~- -* * * *l* * * * * * * * * * * *l* * * * * * * * * * * *l* * * * * * * * -* * *.J. * * * * * * * * * * *I* *

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40 ****;************************:**********************r*********************r***** -- --~---*************-------~---*******************-~ .......................;***********************f----------------------:----

30 ***t**********************r*********************r*********** **********-~*-*********************1 *******************i***********************r*********************t********************r*********-**********-~*-**

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20

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1. 0

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35 40 45 50 c4-1+) /f1F-Jt.

60 65 55 70 75 80 (Zl~t,i,pA YIELD STRENGTH - KSI 653 OEGF

Theoretical Model

  • Traditional PWSCC t 1 = ca-4 exp(Q/ RT)

Creep Rupture

!/!, = C2 t

c

=_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 SIGY 3*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 MN M FIRST CRACKS
  • I ALLOY600

EXTRE l~E VALUE DI S-l HI BUT \oN SIN-I HES!S BASR L r-l\1LURE MODEL P;(t) " I - FXP(- C-b)ri,)

. -R N\OKfE -CR RLO SIMUU\TOR

~  !

I EN (t) -  ::

EXTREM.E VRLUE.

01.s\R\ \3ll110\'l t

i &T FA\ LUR.£. 11f\i\ES FOR PORIU\TIOI'{ OF SJlE N

  • TIME TO FIRST CRACKING VS YIELD STRENGTH CE PRESSURIZER NOZZLES 200 ............................. *****************=* .........................................******* .. .... ..... . .......... ******.* ............ *- ****************** .... **!** ...................... ***** ********-**. -~*-**

150

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30 40 50 60 70 80 653 OEGF YIELD STRENGTH - KSI

APPL/CATION TO CRDMLIFE PREDICTION ANALYSIS

  • ASSUMPTIONS
  • 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

TIME TO FIRST FAILURE FOR CROM NOZZLES WITH 45 KSI OPERATING STRESS BASAL EXTREME

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CHRlVGt. JN t PWSc.c FOR.

UN I FORM DE~O RM~TlON TESTS C HAN()E IN tPhJSCC FDf\ VNIFOR[\\ APPLIED STR t.SS TES'fS .

(}'! = J( TA.UNEl\L ) G~RIN Sltof_ .

C\1R~tJ CONTtl-JT)

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