ML102080492
| ML102080492 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 07/27/2010 |
| From: | Tam P Plant Licensing Branch III |
| To: | Loeffler R, Neve D, Rippy L Northern States Power Co |
| Tam P | |
| References | |
| TAC ME3937 | |
| Download: ML102080492 (2) | |
Text
Accession No. ML102080492 From:
Tam, Peter Sent:
Tuesday, July 27, 2010 11:30 AM To:
Rippy, L. Randal; Loeffler, Richard A.; Neve, Douglas A.
Cc:
Widrevitz, Dan; Mitchell, Matthew
Subject:
Monticello - Draft RAI re. Relief Request 19 dated 5/6/10 Randy:
By letter dated May 6, 2010, Northern States Power Company - Minnesota (NSPM) requested relief from certain examination requirements imposed by the American Society of Mechanical Engineers (ASME) Code,Section XI for the Monticello Nuclear Generating Plant (MNGP).
Specifically, pursuant to 10 CFR 50.55a(g)(5)(iii), NSPM determined that the examination requirements of 100 percent volumetric examination coverage of all Class 1 reactor pressure vessel nozzle-to-vessel welds were impractical for the following welds: N-2A NV, N-3C NV, N-4B NV, N-6B NV, N-7 NV, N-8B NV, and N-10 NV for the Fourth 10-Year Interval ISI Program.
The percent volumetric coverage of the examination of these welds also fell below the 90 percent criteria of ASME Code Case N-460, Alternative Examination Coverage for Class 1 and Class 2 Welds,Section XI, Division 1.
In order for the NRC staff to complete its review, additional information is needed as outline in the draft request for additional information below. Please set up a conference call with me to permit your staff and the NRC staff to discuss these draft questions.
- 1. A number of the welds for which relief was requested are not unique in the Monticello plant (i.e., relief was requested for a subset of multiple, similar welds). Please indicate how many additional welds of the same type (recirculation inlet nozzle, feedwater inlet, etc.) exist and have been inspected during this or the prior interval. For those similar welds that have been inspected during this or the prior interval, please provide the percentage of the required weld volume that was inspected, whether any indications were identified, and how those indications were dispositioned.
- 2. The application specifies that no unacceptable flaws were detected. Please identify if any indications were identified in the subject welds and dispositioned as being acceptable in accordance with either ASME Code,Section XI, IWB-3500 or IWB-3600.
This e-mail aims solely to prepare you and others for the proposed conference call. This e-mail does not formally request for additional information, and does not convey any formal NRC staff position.
Peter S. Tam Senior Project Manager (for D. C. Cook and Monticello)
Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Tel. 301-415-1451
E-mail Properties Mail Envelope Properties (3D6B1F4F51D25E4E9B6C93FF92DAE5171443BF9A34)
Subject:
Monticello - Draft RAI re. Relief Request 19 dated 5/6/10 Sent Date: 7/27/2010 11:30:23 AM Received Date: 7/27/2010 11:30:00 AM From: Tam, Peter Created By: Peter.Tam@nrc.gov Recipients:
L.Rippy@xenuclear.com (Rippy, L. Randal)
Tracking Status: None Richard.Loeffler@xenuclear.com (Loeffler, Richard A.)
Tracking Status: None Douglas.Neve@xenuclear.com (Neve, Douglas A.)
Tracking Status: None Dan.Widrevitz@nrc.gov (Widrevitz, Dan)
Tracking Status: None Matthew.Mitchell@nrc.gov (Mitchell, Matthew)
Tracking Status: None Post Office:
HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 10504 7/27/2010 Options Expiration Date:
Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: