ML022460169

Undated FENOC Slides Risk-Informed Evaluation (Pp. 10, 14, 16, 17)

ML022460169
Person / Time
Site:	Davis Besse
Issue date:	08/29/2002
From:	FirstEnergy Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation
References
FOIA/PA-2002-0229
Download: ML022460169 (4)

Text

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F3 MA771A NIAk & AHIMADr.I Cae BC P~redicted Leaks for various Weibull Leak Initiation Models C0 cm!

cc Expected Number of Leakine CRDM Nozzles.

Davis- Davis- EBURI MRP Besse Davis- Besse Upper Median EPRI MRP Shape Besse EFPY Projection Weibull Parameter Refueling EFPY Corrected Proiection 1.5 Shape 'Model Modified Outage to 600F 1.5 Shape Parameter Parameter Proiection Scale PrParameter 10 10.56 12.91 5.0 1.0 9.5x10"5 0.02 11 12.33 15.07 6.3 1.3 1.7xO"3 0.36 12 14.06 17.18 7.6 1.6 1.9x10"2 4.00 13 15.81 19.32 8.9 1.9 0.17 28.3 16.37 20.00 9.3 2.0 0.32 43.7

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Risk-InfuormedEvuluution Conditionail Core lhmagei/Rlealse Probaiit!y

~ Davis-Besse conditional core damage probability for a 0.1 ft2 medium LOCA is 2.7 x 10-3.

SConditional large earlv elease probability for a medium LOCA is about 4 Qx60' 7 The conditionall.,,, ".. b ility -forthis analysis is less thana-pp!ed inthePSA because the medium LOCA rangeiethe PS-A s 0002 ft2 - 0.5 W.

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lpr EPRI MR1P Constant Initiation .Proe.ti-n Shape Parameter Frequency 1.5 Shape Modified Scale

,_,_,_ Parameter Parameter Bounding Bestm Bounding .. 'Best B did . e EEst B Bmate....., Estimate CDF 1.8 E-6 9.9 E-8 1.1 E-6 6.3 E-8 3.3 E-7 1.9 E-8 LERF 2.6 E-9 1.5 E-10 1.7 E-9 9.4 E-11 4.9 E-10 2.8 E-11 Person REM 0.16 9.2 E-3 .11 5.9 E-3 3.1 E-2 1.7 E-3

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17 FENOC