ML101810591
| ML101810591 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/29/2010 |
| From: | Mahesh Chawla Plant Licensing Branch III |
| To: | Hassoun A Detroit Edison |
| Chawla M, NRR/DORL, 415-8371 | |
| References | |
| TAC ME3119 | |
| Download: ML101810591 (1) | |
Text
From:
Chawla, Mahesh Sent:
Tuesday, June 29, 2010 10:44 AM To:
Alan I Hassoun Cc:
Nove, Carol
Subject:
Fermi 2 - RR-A30 - Continuation of Risk-Informed Inspection (RI-ISI) application on circumferential welds in Class 1 piping - ME3119 The Nuclear Regulatory Commission (NRC) staff has reviewed the information provided by Detroit Edison for Fermi 2 in its letter dated January 20, 2010, and has determined that additional information is necessary to complete the review of Relief Request RR-A30. Based on the staff=s review, please provide a response which addresses the following questions. Please arrange a teleconference if you wish to discuss this with the staff:
- 1. Per Regulatory Guide (RG) 1.193, Rev 2 (Oct 2007), Code Case N-578 is listed as an unacceptable Section XI Code Case. Please explain the use of Code Case N-578 in Relief Request RR-A30. Additionally, Code Case N-578 was revised by the ASME Code and version N-578-1 was approved on March 28, 2000. In light of the fact that Code Case N-578 does not include item number R1.20 for Elements not Subject to a Damage Mechanism, should the reference to this Code Case be to N-578-1?
- 2. How does the update from the ASME Code, 1989 Edition, No Addenda to the 2001 Edition through the 2003 Addenda impact the Risk-Informed Inservice Inspection (RI-ISI) program?
- 3. How does the proposed 3rd 10-year interval RI-ISI program impact the augmented inspection program that is implemented at Fermi 2 in accordance with the guidelines contained in the BWR Vessel and Internals Project Report No. BWRVIP-75?
- 4. Item 3 on Page 3 of RR-A30 describes welds that were added to the RI-ISI population to replace welds that would have had limited examination coverage. The added welds were described as single side access welds. Please explain what is meant by single side access welds, using figures if necessary. What coverage is expected on these welds? If coverage on each weld is less than essentially 100% (essentially 100%, as clarified by ASME Code Case N-460, Alternative Examination Coverage for Class 1 and Class 2 Welds, is greater than 90% coverage of the examination volume), please explain why the combination of coverage for two welds is an adequate/appropriate substitution for one weld that was originally selected for the RI-ISI program.
E-mail Properties Mail Envelope Properties ()
Subject:
Fermi 2 - RR-A30 - Continuation of Risk-Informed Inspection (RI-ISI) application on circumferential welds in Class 1 piping - ME3119 Sent Date: 6/29/2010 10:40:24 AM Received Date: 6/29/2010 10:43:00 AM From: Chawla, Mahesh
Created By: Mahesh.Chawla@nrc.gov Recipients:
hassouna@dteenergy.com (Alan I Hassoun)
Tracking Status: None Carol.Nove@nrc.gov (Nove, Carol)
Tracking Status: None Post Office:
Files Size Date & Time MESSAGE 11167 6/29/2010 Options Expiration Date:
Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: