ML101930333

Draft Request for Additional Information on ISI Relief Request No. 17

ML101930333
Person / Time
Site:	Monticello
Issue date:	07/09/2010
From:	Tam P Plant Licensing Branch III
To:	Loeffler R Northern States Power Co
Tam P
References
TAC ME3526
Download: ML101930333 (2)

Text

Accession No. ML101930333 From: Tam, Peter Sent: Friday, July 09, 2010 2:24 PM To: Loeffler, Richard A.

Cc: Parks, Benjamin; McLellan, Thomas

Subject:

Monticello - Draft RAI on Relief Request dated 3/12/10 (TAC ME3526)

Rick:

The NRC staff is continuing its review of your 3/12/10 Relief Request No. 17, Extension of Permanent Relief from Volumetric Examination of Reactor Pressure Vessel Circumferential Shell Welds for the Renewed Operating License Term. Two issues were identified by our technical staff that need to be supplemented. We look forward to discussing these issues with you in a conference call.

1) Please describe the fluence calculcations performed that support this relief request.

Address their adherence to Regulatory Guide 1.190 recommendations, and if applicable, reference the NRC-approved methodology document that was used to perform the calculations.

2) Please describe the fast neutron flux source used to determine the 120-percent original licensed thermal power level neutron fluence. Discuss whether the uprated fluence projection is based on extrapolation of previous fluence values, or on a new source analysis. If it is based on extrapolation, please provide additional information justifying the extrapolation in terms of its conservatism relative to expected peripheral flux values during uprated operation.

This e-mail aims solely to prepare you and others for the requested conference call. This e-mail does not formally request for additional information, and does not convey an official 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 (3D6B1F4F51D25E4E9B6C93FF92DAE5171443BF7FDC)

Subject:

Monticello - Draft RAI on Relief Request dated 3/12/10 (TAC ME3526)

Sent Date: 7/9/2010 2:24:21 PM Received Date: 7/9/2010 2:24:00 PM From: Tam, Peter

Created By: Peter.Tam@nrc.gov Recipients:

Richard.Loeffler@xenuclear.com (Loeffler, Richard A.)

Tracking Status: None Benjamin.Parks@nrc.gov (Parks, Benjamin)

Tracking Status: None Thomas.McLellan@nrc.gov (McLellan, Thomas)

Tracking Status: None Post Office:

HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 12224 7/9/2010 Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: