ML13057A612

NRC Meeting with Duke Energy Carolinas, LLC Briefing Slides on Oconee Site Flood Protection

ML13057A612
Person / Time
Site:	Oconee
Issue date:	11/05/2008
From:	Office of Information Services
To:
References
FOIA/PA-2012-0325
Download: ML13057A612 (3)

Text

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Oconee Site Flood Protection NRC Meeting with Duke Energy Carolinas, LLC November 5, 2008 r~jU.S.NRC ý_.r'R.ýtn.

Purpose

• Discuss concerns with SSF licensing basis

• Discuss short-term interim measures for ONS operation

• Discuss a long-term solution to the question of flood protection at the ONS site

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6f'ic I a0 y- ý cr* tl Iýn mi o Qllfat 'e t Concerns With SSF Licensing Basis SSF has protection against 5-ft or lower flood heights

- The only inundation study on record had calculated flood heights in excess of 5 feet

" NRC issued 10 CFR 50.54(f) letter

" Licensee response insufficient based on:

- Assertion that dam failures are not part of licensing basis

- Duke's response in dismissing various credible failure modes of Jocassee Dam

<ý*U ,S.NRC ýa Short-term Operation

• Basis for continued operation

- Low initiating event frequency

- Accident sequence progression timelines

• Additional information

- Plans for further modeling

- Interim guidance

- Bases for the proposed February 2009 modifications 1ýjU.S.NRC %u -bSei..t.y RIaorr kn off~ioiad UseQn`@\SecuLriWke'at ýdlnf~orml'al } 2 2n

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Long-term Operation

" Technical arguments in 10 CFR 50.54(f) response are, insufficient

- Argument on probabilities of failure inadequate

- Inundation study not sufficient for licensing basis

" Technical basis needs to be re-established

- Submittal from Duke in 1 year

- NRC review in 1 year

• Analytical approach, if proposed, needs to follow current NRC guidance or have a clear basis for any deviation

" Engineered approach, if proposed, must have an adequate, conservative technical basis.

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