ML14058A027

DHS Briefing Slides on Oconee Flood Protection and the Jocassee Dam Hazard

ML14058A027
Person / Time
Site:	Oconee
Issue date:	09/19/2008
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: ML14058A027 (12)

Text

US.NRC h*&q LD PeopJ* a"d the &F.notmeii Oconee Flood Protection and the Jocassee Dam Hazard DHS Briefing September 19, 2008 10/3/2012 Off, Use nly -S siti Internal o tion 1 USSNRC ( iuse anin -oeasn Jye, Overview* Objective-Provide background information for issue-Provide status and path forward.Success-Understanding of the regulatory and safety issues-Understanding of NRC planned actions-Identify any NRC/DHS issues that need further action 10/3/2012 0 ial U nly-Se iti e 2 cilUse ly -Sens' ve U.SNRC I ,nalia on Oconee Nuclear Station* Three pressurized water reactors located in Seneca, South Carolina-Owned and operated by Duke Energy Corporation

-Operational in 1973-74-Located down river of lake Keowee (just north of site) and lake Jocassee (11 miles upriver), Only nuclear plant in the United States that relies on hyrdo-electric generators as emergency power source (Keowee Hydro Station), Plant relies on the Standby Shutdown Facility (SSF) to maintain reactor shutdown in case of fires, floods, or sabotage events.-SSF contains its own electric power source (diesel generators, batteries, etc..), control room.-SSF is a retrofit to the original plant design.10/3/2012 3

.7 UjS.NRC I NrL TM IcuhaRGItuRYozyce 9s0 Pmkdi qeopk mddtwebninmma The Flood cenario Rupture of Jocas, "* + .-..+-. i 0.... .: 1 .., 4 Eastato. --Keo~ee Toxaway -+;Bs Creek State. Nine Times°rP Park M--M:.4- ".-,. '.- 4 .,, Ns,. .T.., .- ._ ' * ." .....Lal p.,.IA *,,Ii-Pickens* ?L .,, Oconee Site 1 ../ 2 4, 1 2 10/3/2012 Offii sOnly -S it De-interna nf mrtio n 4 IU.S.NRC Ihoteca aPtopk ad ikEari'rowmm Jocassee Dam Aerial 10/3/2012 ic Use 0 Senst e Ine form 'ns 5

~IUS.NRC rrU 1E NLbUR W LADO COMMDiOI AoktecnR PeopkeanddikeEmiommal Off a Us Ony -Sensi' e ternal rmat' n-!!or 6 Offic' Use -Sensiti SIjU.S.NRC IK2\tJ L MI D I I A W L A I n0aln tE The SSF Flood Barriers.L ri',\' 1 01312012 .6.f,..,lUs , ..- ,.si4 ill~11 7 '"; .:.4 ,.14,*., .4V ,k4. ' , .Five-foot flood wall protecting the doorway.10/3/2012

&ca sVn- SensiAe 7 SUS.NRC M , SKID,.I.A],BMU.

.1 I , XI I sProteln epk and 6~en Ern;*rnwx1 Key Insights from Reactor Oversight Process* In 2007, NRC concluded that the Jocassee dam failure issue had not been adequately resolved.* Duke Hydro/FERC Inundation Study completed in early 1990s. Estimated flood heights up to 16.8 ft above SSF grade level., Floods in excess of 5 ft lead to three-unit core damage event and ultimate failure of each containment building, , Staff identified an under-estimate in licensee's dam failure frequency.

10/3/2012 8 US,NRC Inte alsIn -me io Pru im Penpic and iAv Erronmens Issuance 50.54(f Letter On August 15, 2008, NRC issued letter to licensee requiring information to determine if NRC should modify, suspend, or revoke the license.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., Licensee to respond to NRC by September 29, 2008.10/3/2012 9 Vul~ciai us unry\- OensIii ('ýv)~U.S.NRC I ernahl Infbrmatfi'o Actions Concurrent with 50,54(f) Letter Backfit evaluation:

external flooding within licensing basis. Licensee did not address Jocassee dam failure., "Adequate Protection" based backfit best approach.-No defense-in-depth:

three unit core damage event with ultimate failure of each containment.

-Regulatory expectations for external flood protection includes dam hazards., Cost-benefit estimate of $3 million in modifications.

Modifications on the order of $13 million justified.

10/3/2012 10 Official nly- Se 'itive (IU.S.NRC tM o 01ISUM WA KWIUR111WORMUDM Actions Concurrent with 50,54() Letter (continued), In early September 2008, NRC staff notified Congressional staffers regarding the issue., NRC anticipates interaction with Congressional staffers on the issue and NRC resolution., Generic issue preliminary assessment completed.

-Twenty five sites have a dependency on dam performance.

Seven sites (including Oconee) have dams up river of the site.-Draft Information Notice has been written.10/3/2012 11 jU5SNRC Int nal Infor tio NteigPeopkt and ik Ewirnonmwi NRC/DHS Interface o NRC staff is providing this information to DHS should it affect the ranking of the Jocassee Dam from a security oversight standpoint., NRC has not determined how or if security issues may affect the NRC's regulatory actions.* Are there any additional actions that DHS could take, if necessary, to further protect the dam?10/3/2012 O1al UseON -Se itive 12 1 Iflr a1nfor 'natn