ML022460142
| ML022460142 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/29/2002 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| FOIA/PA-2002-0229 | |
| Download: ML022460142 (1) | |
Text
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(7 70 60 CCPOF=0.01 CCPOF=O.01 IL 50 0
S 40 30
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20 10 0
I I
I III!
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I i1 II II 0
50 100 150 Crack Half Angle I I I, 1
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il 1' 1 1 1'11 lo l l 0.7 0.6 a
0.5 0-0.4 "6
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0 10 20 30 40 50
- 60.
Time to Failure (months)
Long term results for integrated model. Linear region extends from about 25-50 months.
Integrated model:
Calculation is for some fixed period of operation (say 20 EFPY at 600TF)
- 1.
Determine number of nozzles that have cracked by randomly selecting a value of the Weibull parameter from a lognormal distribution with log mean 5.35 and 0.65
[determined by fitting to available inspection results] and assuming a Weibull slope of 1.5.
The fraction of cracked nozzles is given by IfIOrnIMýJU1 i
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