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:
Shared Package
ML14055A421	List: ML090570117 ML090680737 ML091620669 ML092020480 ML092940769 ML100280954 ML101750619 ML101890803 ML102990064 ML103410042 ML12268A404 ML14055A410 ML14055A411 ML14055A474 ML14058A015 ML14058A016 ML14058A017 ML14058A018 ML14058A019 ML14058A020 ML14058A021 ML14058A022 ML14058A023 ML14058A024 ML14058A025 ML14058A026 ML14058A027 ML14058A028 ML14058A029 ML14058A030 ML14058A031 ML14058A032 ML14058A033 ML14058A034 ML14058A035 ML14058A036 ML14058A037 ML14058A038 ML14058A039 ML14058A040 ML14058A042 ML14058A043 ML14058A044 ML14058A045 ML14058A046 ML14058A047 ML14058A048 ML14058A049 ML14058A050 ML14058A051 ... further results
References
FOIA/PA-2012-0325
Download: ML14058A025 (11)

Text

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~peop ad dtr~i~ ~ mmiIOconee Flood Protection and theJocassee Dam HazardCommission Assistants briefAugust 12, 200810/3/2012

,,Official U nly -Sens' emai m 'n1D wo

/ 2U.S.NRC I o,-aPmkig htpk : at brnon~etOverview, Objective

-Provide background information for issue.-Attain senior management alignment on issuance of arequest for information per 10 CFR 50.54(f).

Alignments meetings held within NRR (7/28) and betweenNRR, 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 2ternalin ma n (iUS.NRCPrdm5 Ptoyk ad GdwFriromwaes\In'trral Infor eThe oo cenarioRupture of Jocassee DamI JocasseeNioNlrnois toe .385-ftMeeaway__ Nine Timesark " ' o" Six Mile1d PickenaC a l10/3/2012 3

ýUOS.NRCfteain Pkpt.md the Earimmmi:

JOciae Inem __ o tiionJo cwassee uam Aerial1013/2012 4

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,' , I Use lin\ ensitieThet talF nfoor arrierThe SSF Flood BarriersIf'"'-'4"10/3/2012 6

(USSRCPIutiqD op an WA~ Er.4rmeKey Insights from Reactor Oversight Process, Staff discovered that the Jocassee dam failureissue had not been adequately resolved.

, Duke Hydro/FERC Inundation Study completed in early 1990s. Estimated flood heights up to16.8 ft above SSF grade level.* Floods in excess of 5 ft lead to three-unit coredamage event., Staff identified an under-estimate in licensee's dam failure frequency.

10/3/2012 fia y Sensiivq7 Inerna t

-~U.S.NRC (1WIU~VIIssuance 50.54() Letter50.54 letter is best regulatory approach to initiateresolution.

Goal to issue letter by August 8.Letter seeks information to assure protection of publicand elevates NRC's regulatory and safety concerns.

• Letter states that Jocassee Dam Failure Inundation Study indicates flood heights up to 16.8 feet above SSFgradeNRR Director and Region Il Administrator to have jointcall with Duke senior management when letter is issued.Brief Commissioner Assistants prior to letter issuance.

10/312012 icial Us My -Se 'tive 8Internal In rm on I$yUSNRCPrcmPeopl aid 11w EavirmwNgt Actions Concurrent with 50.54(f)

Letter* Backfit evaluation:

external flooding withinlicensing basis, Licensee did not addressJocassee dam failure.Cost-benefit estimate of $3 million inmodifications.

Modifications on the order of $13million justified, 10/3/2012 9

~U.STINRU

=%W%'lEDti Eo l Actions Concurrent with 50.54() Letter(continued)

Generic issue preliminary assessment completed.

-Twenty five sites have a dependency on dam performance.

Eightsites (including Oconee) have dams up river of the site.-Draft Information Notice has been written., Communication plan developed for Oconee actions andgeneric implications.

Plan covers internal stakeholders only because information concerning issue is sensitive.

Justification for continued interim operations of Oconeein progress.

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

' icial Use y -

USRC al Inforom 10cr~ng hople adAtA E~rn-miled Followoup Actions After Issuanceof 50.54() Letter, Prepare a draft Safety Order to direct Oconeeplant modifications and modify Oconee license.* NRC senior management to call Duke seniormanagement when letter is issued.* Evaluate licensee's response to letter., Determine if Safety Order is the appropriate regulatory vehicle.10/3/2012 11