U. S. Nuclear Regulatory Commission 10 CFR 50.46 Annual Notification and Reporting for 2009

The purpose of this letter is to report the impact of changes or errors in the emergency core cooling system (ECCS) evaluation models used by Westinghouse Electric Company. A description of the changes to the Westinghouse small-break LOCA and large-break LOCA ECCS evaluation models for 2009 is provided as an attachment. Westinghouse has categorized these changes or errors into two separate groups: * Non-Discretionary Changes * Discretionary Changes This annual notification is being provided since it affects information previously submitted in Westinghouse topical reports. It is noted that plant-specific peak cladding temperature (PCT) variations are not addressed in this letter. These should be treated, as appropriate, on a plant-specific basis in accordance with the applicable sections of 10 CFR 50. Westinghouse has notified licensees utilizing these Westinghouse ECCS evaluation models in their plant licensing basis of the appropriate reportable changes. For future referencing convenience, the 2009 10 CFR 50.46 reportable changes provided in the attachment, together with the "2008 Formulation " offered in Reference 2 constitutes the "200