ML101300006

Follow-Up Questions - EPU Vessels and Integrity Review

ML101300006
Person / Time
Site:	Nine Mile Point
Issue date:	04/14/2010
From:	Richard Guzman Division of Operating Reactor Licensing
To:	Darling T Constellation Energy Nuclear Group
Guzman R, NRR/DORL, 415-1030
References
TAC ME1476
Download: ML101300006 (1)

Text

From: Guzman, Richard Sent: Wednesday, April 14, 2010 2:05 PM To:

Darling, Theresa H Cc:

Dosa, John J

Subject:

Follow-up Question - EPU Vessels & Internals Integrity

Theresa, We'd like to discuss the two items below in support of completing the safety evaluation in the Vessels & Internals Integrity review area:

1. NMPNS stated in its RAI Response dated February 19, 2010, Attachment 5, RAI Response G1, that they consider their commitment to maintain a RG 1.190 fluence program as adequate.

The NRC staff considers it appropriate for the licensee to commit to submit a revised relief request for elimination of the circumferential reactor vessel weld inspection a full year before the currently approved fluence is reached.

2. The NRC staff notes that the current P-T limits in the Technical Specifications, good up to 22 EFPY (approved in Amendment #240 by the NRC on Jan. 27, 2004), is based on a projected neutron fluence at the 1/4 T location on the limiting baseline material of 3.77E17 neutrons per square centimeter (n/cm2) for neutrons with > 1MeV energy. The proposed EPU will increase the neutron flux and the projected fluence level, and therefore, the staff anticipates that the limiting fluence for which the P-T limits are based upon will be reached before 22 EFPY. The staff requests the licensee to provide the revised EFPY value when the 3.77E17 n/cm2 neutron fluence will be reached at the 1/4 T location on the limiting baseline material with the assumption that proposed EPU is approved and implemented on schedule. If the new value invalidates the period of applicability (in EFPY) of the current TS figure, an updated TS page should be submitted which correctly expresses the period of applicability post-EPU.

Anytime Tues - Thurs next week works for us.

Thanks, Rich Guzman 301-415-1030 E-mail Properties Mail Envelope Properties (92E0E77F3622DA40B501E8D45083D5D9508499C81C)

Subject:

Follow-up Question - EPU Vessels & Internals Integrity Sent Date:

4/14/2010 2:04:41 PM Received Date:

4/14/2010 2:04:00 PM From:

Guzman, Richard Created By:

Richard.Guzman@nrc.gov Recipients:

Theresa.Darling@cengllc.com (Darling, Theresa H)

Tracking Status: None John.Dosa@cengllc.com (Dosa, John J)

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