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
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References
FOIA/PA-2012-0325
Download: ML14058A027 (12)

Text

US.NRC a"dthe&F.notmeii LD PeopJ*

h*&q Oconee Flood Protection and the Jocassee Dam Hazard DHS Briefing September 19, 2008 10/3/2012 Off, Use nly - S siti 1 Internal o tion

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 ialU nly-Se iti e 2

U.SNRC cilUse I,nalia ly - Sens' ve on Oconee Nuclear Station

• Three pressurized water reactors located inSeneca, South Carolina

- Owned and operated by Duke Energy Corporation

- Operational in1973-74

- Located down river of lake Keowee (just north of site) and lake Jocassee (11 miles upriver)

, Only nuclear plant inthe 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 incase of fires, floods, or sabotage events.

- SSF contains its own electric power source (diesel generators, batteries, etc..), control room.

- SSF isa retrofit to the original plant design.

10/3/2012 3

.7 UjS.NRC I TM NrLIcuhaRGItuRYozyce 9s0 Pmkdiqeopkmddtwebninmma The Flood cenario Rupture of Jocas 4:*,- , "

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IU.S.NRC Ihoteca aPtopk ad ikEari'rowmm Jocassee Dam Aerial 10/3/2012 ic Use 0 Senst e 5 Ine form 'ns

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D A I MI I W L A Offic' Use The SSF Flood Barriers I IK2\tJ n0aln

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1 01312012 .6.f,..,lUs , . .- ,.si4 Five-foot flood wall protecting the doorway.

10/3/2012 &ca sVn- SensiAe 7

SUS.NRC M, SKID,.I.A],BMU.

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.1 I sProteln epk and6~enErn;*rnwx1 Key Insights from Reactor Oversight Process

• In2007, NRC concluded 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 and ultimate failure of each containment building,

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

10/3/2012 8

US,NRC -me Inte alsIn io PruimPenpic and iAvErronmens Issuance 50.54(f Letter On August 15, 2008, NRC issued letter to licensee requiring information to determine ifNRC 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

('ýv)~U.S.NRC unry\- OensIii Vul~ciai Iusernahl 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 $3million inmodifications.

Modifications on the order of $13 million justified.

10/3/2012 10

Official nly- Se 'itive (IU.S.NRC 01ISUM WA KWIUR111WORMUDM tM o Actions Concurrent with 50,54() Letter (continued)

, Inearly 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 andik Ewirnonmwi NteigPeopkt Int nal Infor tio NRC/DHS Interface o NRC staff isproviding this information to DHS should itaffect the ranking of the Jocassee Dam from a security oversight standpoint.

, NRC has not determined how or ifsecurity issues may affect the NRC's regulatory actions.

• Are there any additional actions that DHS could take, ifnecessary, to further protect the dam?

10/3/2012 O1alUseON S-e itive 12 Iflr 1 a1nfor 'natn