ML13053A060

Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, External Flood Reevaluation

ML13053A060
Person / Time
Site:	Oconee
Issue date:	02/19/2013
From:	Duke Energy Carolinas
To:	Office of Nuclear Reactor Regulation
Boska J
References
Download: ML13053A060 (9)

Text

Fukushima External Flood Reevaluation NRC Headquarters One White Flint North Rockville, MD February 19, 2013 Oconee Nuclear Station

Duke Attendees Dave Baxter, Baxter VP, VP Regulatory Project Completion Dean Hubbard, Oconee External Flood Licensing Manager Dana Jones, Oconee Fukushima Engineering Supervisor George Attarian, Duke Energy Fukushima Flooding Manager Andrew Miller, Senior Engineer - AMEC/ERIN Joe Bellini, Bellini Associate AMEC 2

Agenda Overview Introductions and Opening Remarks Flooding Integrated Assessment Update NRC and FERC feedback Action Item Review 3

Flooding Integrated Assessment Update Integrated g Assessment Preliminary y Schedule January - Team kickoff February - Peer Review team lead identified March - Hazard Reevaluation completed & identification of controlling flood parameters May - Evaluation of existing flood protection complete July - Evaluation of protection/mitigation complete August - Protection/mitigation strategy & mod scope determined September S t b - Complete C l t fi firstt d draft ft off IA October - Expected submittal of the IA to the NRC 4

Flooding Integrated Assessment Update Flooding g Hazard Reevaluation Update p Flooding Hazard Reevaluation Due 3/12/13 Dam Failure Evaluation Updating U d ti January J 28, 28 2011 SSafety f t EEvaluation l ti Overtopping and Seismic failure not considered credible Assuming Sunny Day Failure with piping as the failure mechanism USGS 2008 Seismic,, mean seismic hazard curves for 1,, 5,, 10 Hz,, and PGA. 10-4 w/ Uniform Hazard Response Spectrum (UHRS).

Xu & Zhang (2009) - Breaching Parameters for Earth and Rockfill Dams 2 D Analysis y in p progress g

Local Intense Precipitation HMR-51/52 basis for rain event Site Sit results lt iin fifinall review i

5

Flooding Integrated Assessment Update Integrated Assessment Assumptions Timely NRC review of Hazard Reevaluation Use U JLD JLD-ISG-2012-05 ISG 2012 05 tto perform f iintegrated t t d assessmentt Two flooding hazards of significance are Dam Failure & LIP Protection will preserve key safety f functions f

Plant modes: 1 through 6 (6 for one of three units)

Evaluation Process - Scenario-Based Evaluation 6

Flooding Integrated Assessment Update Open Areas to be Addressed Timely response to pending FAQs Seismic dam failure analysis criteria Flood Duration - Stable state maintained indefinitely Conceptual Modifications proposed for protection FERC - Board of Consultants 7

Flooding Integrated Assessment Update Regulatory feedback NRC NRO NRR FERC 8

Action Items Action Items Current - (none for first meeting)

New items 9