ML022400363
| ML022400363 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/27/2002 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| FOIA/PA-2002-0229 | |
| Download: ML022400363 (1) | |
Text
Summary of Davis-Besse Risk Assessment of CRDM Crackings PRA Values without CRDM contribution Davis-Besse IPE Revision CCDP, given MLOCA initiation Total CDF Irv (without CRDM Crack) 6.87 x 101 6.6 x 10+
CDF Contribution by CRDM Crackings Inspection Credits Increase in CDF, Iry (Initiating Event Frequency)
Cumulative CDP 3 months 6 months No Credit to Inspections No Credit to 11 & 12 RFO inspections No Credit to 12 RFO Inspection 3 Grouping Approach (Davis-Besse Submital) 3 Grouping Approach (with Davis-Besse'sExperiences per nozzsle-year:
1.55 x 10.2/0.503 x 102=3.2)
Credit to All Inspections 9.2 x 10 (3.4 x 10.2) 2.69 x 10-5 (1.0 x 10.2) 4.5 x 101 (1.7 x 10) 6.97 x 10' (2.54 x 10')
2.18 x 10 (8.0 x 10")
1.30 x 10" (4.81 x 10')
2.3 x 10i 6.72 x 101 1.13 x 101 1.73 x 101 5.41 x 10"1 3.25 x 10-4.4 x 10 1.35 x 105 2.25 x 10 3.49 x 10' 1.08 x 106 6.50 x 10' 1.
2.7 x 10-NRC SPAR-3i 2.53 x 10-3 4.03 x 105 2.