ML021210243
| ML021210243 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 04/30/2002 |
| From: | Tam P NRC/NRR/DLPM/LPD1 |
| To: | Czaya P, Distel D, Rombold G, Steingass T AmerGen Energy Co |
| Tam P, NRR/DLPM, 415-1451 | |
| References | |
| TAC MB2940 | |
| Download: ML021210243 (2) | |
Text
From:
Peter Tam To:
INTernet:David.distel@exeloncorp.com; INTernet:george.rombold@exeloncorp.com; internet:paul.czaya@exelon.com; Timothy Steingass Date:
4/30/02 11:02AM
Subject:
Oyster Creek - Relief Request R17, Rev. 1 (TAC MB2940)
George, Dave, Paul:
Our reviewer, Timothy Steingass, has the following comments on your 9/14/01 submittal:
Page 5 of 6 says that you performed a VIPER code analysis for axial weld failure probability to assess the effect of fracture due to the 57% inspection coverage on the vessel axial welds.
Your result was a 2.5E-12/year failure probability due to the 57% beltline examination coverage.
In reading the safety evaluation to the BWRVIP-05 report, Tim finds this to be substantially lower than the BWR fleet failure probability limit of 5E-6 per reactor-year to assure vessel integrity.
(1) Were your calculations based on 114 degrees F or 70 degrees F mean RTNDT ?
- 2) Why is your Vessel Failure Probability six times an order of magnitude lower than the BWR fleet?
- 3) What are your values for Conditional Failure Probability and Low Temperature Overpressure Frequency?
These comments are provided to prepare you for a phone call. This e-mail does not formally request additional information, and does not convey a formal NRC staff position. Disposition of these comments will be discussed in the phone call.
Peter S. Tam, Senior Project Manager Project Directorate I-1 Division of Licensing Project Management Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 Mail Envelope Properties (3CCEB203.501 : 10 : 20510)
Subject:
Oyster Creek - Relief Request R17, Rev. 1 (TAC MB2940)
Creation Date:
4/30/02 11:02AM From:
Peter Tam Created By:
PST@nrc.gov Recipients Action Date & Time David Transferred 04/30/02 11:02AM distel (INTernet:David.distel@exeloncorp.
george Transferred 04/30/02 11:02AM rombold (INTernet:george.rombold@exelonco paul Transferred 04/30/02 11:02AM czaya (internet:paul.czaya@exelon.com) nrc.gov owf2_po.OWFN_DO Delivered 04/30/02 11:02AM TXS3 (Timothy Steingass)
Opened 04/30/02 11:03AM Post Office Delivered Route David INTernet:exeloncorp.
com george INTernet:exeloncorp.
com paul internet:exeloncorp.c om owf2_po.OWFN_DO 04/30/02 11:02AM nrc.gov Files Size Date & Time MESSAGE 2457 04/30/02 11:02AM Options Auto Delete:
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PUBLIC PDI-1 R/F PTam Accession Number: ML021210243 OFFICIAL RECORD COPY