ML13053A060

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Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, External Flood Reevaluation
ML13053A060
Person / Time
Site: Oconee  Duke Energy icon.png
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 Flood Reevaluation NRC Headquarters One White Flint North Rockville, MD February 19, 2013 Oconee Nuclear Station

Duke Attendees Duke Attendees Dave Baxter VP Regulatory Project Completion Dave Baxter, 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 Associate AMEC Joe Bellini, Associate AMEC 2

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

Flooding Integrated Assessment Update Update Integrated Assessment Preliminary Schedule January - Team kickoff February - Peer Review team lead identified g

y 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 S

t b

C l t fi t d ft f IA September - Complete first draft of IA October - Expected submittal of the IA to the NRC 4

Flooding Integrated Assessment Update Update Flooding Hazard Reevaluation Update Flooding Hazard Reevaluation Due 3/12/13 Dam Failure Evaluation U d ti J

28 2011 S f t E l

ti g

p Updating January 28, 2011 Safety Evaluation 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 in progress y

p g

Local Intense Precipitation HMR-51/52 basis for rain event Sit lt i fi l

i Site results in final review 5

Flooding Integrated Assessment Update Update Integrated Assessment Assumptions Timely NRC review of Hazard Reevaluation U

JLD ISG 2012 05 t f

i t t d t

Integrated Assessment Assumptions Use JLD-ISG-2012-05 to perform integrated assessment Two flooding hazards of significance are Dam Failure & LIP f

f Protection will preserve key safety functions Plant modes: 1 through 6 (6 for one of three units)

Evaluation Process - Scenario-Based Evaluation 6

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

Flooding Integrated Assessment Update Update Regulatory feedback NRC Regulatory feedback NRO NRR FERC 8

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

New items 9