ML14058A025

Briefing Slides for Commission Assistants Brief on Oconee Flood Protection and the Jocassee Dam Hazard

ML14058A025
Person / Time
Site:	Oconee
Issue date:	08/12/2008
From:	Office of Nuclear Reactor Regulation
To:
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References
FOIA/PA-2012-0325
Download: ML14058A025 (11)

Text

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Oconee Flood Protection and the Jocassee Dam Hazard Commission Assistants brief August 12, 2008 10/3/2012 ,,Official U nly - Sens' e 1 mai m'n D wo

/ 2U.S.NRC I o,-a Pmkig htpk : at brnon~et Overview

, Objective

- Provide background information for issue.

- Attain senior management alignment on issuance of a request for information per 10 CFR 50.54(f).

Alignments meetings held within NRR (7/28) and between NRR, RII, OE and OGC (8/1) for path forward on letter.

, Success

- Understanding of the regulatory and safety issues.

- Confirmation of the path forward to resolve issue.

10/3/2012 Official e ly - Sen ive 2 ternalin ma n

• • Infor es\In'trral e

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(USSRC PIutiqD op an WA~Er.4rme Key Insights from Reactor Oversight Process

, Staff discovered that the Jocassee dam failure issue had not been adequately resolved.

, Duke Hydro/FERC Inundation Study completed inearly 1990s. Estimated flood heights up to 16.8 ft above SSF grade level.

• Floods inexcess of 5ft lead to three-unit core damage event.

, Staff identified an under-estimate inlicensee's dam failure frequency.

10/3/2012 fia y Sensiivq7 Inerna t

-~U.S.NRC (1WIU~VI Issuance 50.54() Letter 50.54 letter isbest regulatory approach to initiate resolution.

Goal to issue letter by August 8.

Letter seeks information to assure protection of public and elevates NRC's regulatory and safety concerns.

• Letter states that Jocassee Dam Failure Inundation Study indicates flood heights up to 16.8 feet above SSF grade NRR Director and Region IlAdministrator to have joint call with Duke senior management when letter isissued.

Brief Commissioner Assistants prior to letter issuance.

10/312012 icial Us My -Se 'tive 8 Internal In rm on

I$yUSNRC EavirmwNgt aid 11w PrcmPeopl Actions Concurrent with 50.54(f) Letter

• Backfit evaluation: external flooding within licensing basis, Licensee did not address Jocassee dam failure.

Cost-benefit estimate of $3million in modifications. Modifications on the order of $13 million justified, 10/3/2012 9

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Actions Concurrent with 50.54() Letter (continued)

Generic issue preliminary assessment completed.

- Twenty five sites have adependency on dam performance. Eight sites (including Oconee) have dams up river of the site.

- Draft Information Notice has been written.

, Communication plan developed for Oconee actions and generic implications. Plan covers internal stakeholders only because information concerning issue issensitive.

Justification for continued interim operations of Oconee inprogress.

10/3/2012 0 i Use y Sensiti e 10 Interna Inform ?io m

' icial Use y- ,ensiti*-

USRC al Inforom 10 hople adAtAE~rn-miled cr~ng Followoup Actions After Issuance of 50.54() Letter

, Prepare a draft Safety Order to direct Oconee plant modifications and modify Oconee license.

• NRC senior management to call Duke senior management when letter isissued.

• Evaluate licensee's response to letter.

, Determine ifSafety Order isthe appropriate regulatory vehicle.

10/3/2012 11