ML13095A213

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

ML13095A213
Person / Time
Site:	Oconee
Issue date:	04/09/2013
From:	Hubbard D Duke Energy Carolinas
To:	Office of Nuclear Reactor Regulation
Boska J
References
Download: ML13095A213 (12)

Text

Fukushima External Flood Reevaluation NRC Headquarters One White Flint North Rockville, MD April 9, 2013 Oconee Nuclear Station

Duke Attendees 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, PE, PH, Associate AMEC For Information Only 2

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

Flooding Integrated Assessment Update Integrated Assessment Current Schedule January - Team kickoff February - Peer Review team lead in place (Jeff Wright)

March - Hazard Reevaluation completed & controlling flood parameters identified (*NRC approval of HR by June 2013?)

o May - Complete evaluation of existing flood protection o July - Complete evaluation of protection/mitigation o August - Determine protection/mitigation strategy & mod scope o September - Complete first draft of IA o October - Target date for submittal of the IA to the NRC

(*NRC approval of IA by Feb 2014?)

For Information Only 4

Flooding Integrated Assessment Update Flooding Hazard Reevaluation Update Flooding Hazard Reevaluation Submitted 3/12/13 Technical Briefing for FERC and NRC on 3/25/13 FERC & NRC 3rd party review by Tony Wahl pending?

Dam Failure Evaluation Xu & Zhang (2009) - Breaching Parameters for Earth and Rockfill Dams Water levels inundate portions of site but remain below the power block Additional protection/mitigation will be required Local Intense Precipitation HMR-51/52 basis for rain event Higher water levels on site than CLB Additional protection and/or mitigation will be required For Information Only 5

Integrated Assessment Peer Review Process Peer Team to be participatory Peer Team leader observed discussions at Oconee on:

Strategy Scenario parameters ONS FLEX response Peer Team members:

Jeff Wright, PE - Team Lead Steve Kaasalainen, P.Eng Abdy Khanpour, PE For Information Only 6

Flooding Integrated Assessment Update Integrated Assessment Activities Data collection:

Technical design documents Design basis Licensing basis Site walkdown complete including review of 2.3 Walkdown Report Hazard Reevaluation submitted 3-12-13 in review For Information Only 7

Flooding Integrated Assessment Update Initial Integrated Assessment Assumptions Plant Modes - 1 unit in refueling, 2 units 100% power LIP Storm warning time - days for large storm as synthesized by HMR-51,52 based on geographical location of Oconee Duration of Flood Event - will include warning time, flood progression, inundation, units at hot shut down, recession and time to deploy a strategy that is repeatable/renewable Dam Failure Response - will be protection plus mitigation Mitigation will be evaluated using scenario-based approach As year 1 site - New Dam Failure ISG, JLD-ISG-2013-01 will not be used For Information Only 8

Flooding Integrated Assessment Update Integrated Assessment Assumptions In Review IA Scenarios need to mirror the reevaluation scenarios where design basis is exceeded LIP Responses:

Protection Mitigation Combination of protection plus mitigation Ultimate Heat Sink - long term source Preserve additional water as long term source Action to replenish (e.g. mobile pump unit at river to re-supply site)

For Information Only 9

Flooding Integrated Assessment Update Open Areas to be Addressed IA Example under development by NEI for JLD-ISG-2012-05 Guidance for Performing the Integrated Assessment for External Flooding NRC review of 2.1 Flooding Hazard Reevaluation Additional 3rd Party Review?

NRC process to accept?

NRC schedule?

For Information Only 10

Flooding Integrated Assessment Update Regulatory feedback NRC NRO NRR FERC For Information Only 11

Action Items Action Items Current - (none from last meeting)

New items For Information Only 12