ML13095A213
| 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
For Information Only 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 2
For Information Only Agenda Overview Introductions and Opening Remarks Flooding Integrated Assessment Update NRC and FERC feedback Action Item Review 3
For Information Only Flooding Integrated Assessment Update 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?)
4 Integrated Assessment Current Schedule
For Information Only Flooding Integrated Assessment 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 5
Flooding Hazard Reevaluation Update
For Information Only 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 6
For Information Only Flooding Integrated Assessment Update 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 7
Integrated Assessment Activities
For Information Only Flooding Integrated Assessment Update 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 8
Initial Integrated Assessment Assumptions
For Information Only Flooding Integrated Assessment Update 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) 9 Integrated Assessment Assumptions In Review
For Information Only Flooding Integrated Assessment Update 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?
10 Open Areas to be Addressed
For Information Only Flooding Integrated Assessment Update NRC NRO NRR FERC 11 Regulatory feedback
For Information Only Action Items Action Items Current - (none from last meeting)
New items 12