ML101300006

Follow-Up Questions - EPU Vessels and Integrity Review

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

Text

From:Guzman, RichardSent: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 IntegritySent Date:4/14/2010 2:04:41 PM Received Date:4/14/2010 2:04:00 PM From:Guzman, RichardCreated By: Richard.Guzman@nrc.gov

Recipients:

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

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

Tracking Status: None Post Office:

HQCLSTR01.nrc.govFilesSizeDate & TimeMESSAGE43414/14/2010 Options Expiration Date:

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