ML070510257

Request Conference Call Re. Extension of Third 10-Year ISI Interval

ML070510257
Person / Time
Site:	Palisades
Issue date:	02/20/2007
From:	Tam P NRC/NRR/ADRO/DORL/LPLIII-1
To:	Hazelhoff A, Lahti L, Salamon G Nuclear Management Co
References
TAC MD3059
Download: ML070510257 (2)

Text

From: Peter Tam To: Amy C. Hazelhoff; Laurie A. Lahti; Salamon, Gabor Date: 02/20/2007 8:45:11 AM

Subject:

Palisades: Request Conference Call re. Extension of Third 10- Year ISI Interval (TAC MD3059)

Laurie:

We are reviewing your 9/15/06 relief request to extend the third 10-year ISI interval. The relief request is based on the proposed alternative to the ASME requirements providing an acceptable level of quality and safety. RG 1.174 includes quantitative guidelines that can be used to determine if the change in risk arising from the requested action is sufficiently small to support a determination that the requested action provides an acceptable level of quality and safety. Our reviewer, Steve Dinsmore, has provided the following 2 draft RAI questions:

(1) Please provide an estimate of the increase in core damage frequency (CDF) and large early release frequency (LERF) associated with extending the reactor vessel weld inspection interval from ten years to ten years plus two operating cycles.

(2) Please describe the process used to develop the above estimates, including the process relied upon to provide confidence that the risk/reliability models correspond with the as built, as-operated plant.

Please call me to arrange a conference call to discuss these 2 questions. This e-mail aims solely to prepare you and others for the requested conference call. It does not formally request for additional information, and it does not convey a formal NRC staff position.

We will discuss with you how to disposition the above 2 draft questions.

Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 CC: Chawla, Mahesh; Dinsmore, Stephen Mail Envelope Properties (45DAFB67.3CB : 12 : 35330)

Subject:

Palisades: Request Conference Call re. Extension of Third 10- Year ISI Interval (TAC MD3059)

Creation Date 02/20/2007 8:45:11 AM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time nmcco.com Transferred 02/20/2007 8:45:35 AM AMY.HAZELHOFF (Amy C. Hazelhoff)

Gabor.Salamon (Gabor Salamon)

LAURIE.LAHTI (Laurie A. Lahti) nrc.gov

OWGWPO03.HQGWDO01 Delivered 02/20/2007 8:45:20 AM MLC CC (Mahesh Chawla)

SCD1 CC (Stephen Dinsmore) Opened 02/20/2007 8:54:31 AM Post Office Delivered Route nmcco.com OWGWPO03.HQGWDO01 02/20/2007 8:45:20 AM nrc.gov Files Size Date & Time MESSAGE 2436 02/20/2007 8:45:11 AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed

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