ML14058A025
| ML14058A025 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/12/2008 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML14055A421 | List:
|
| References | |
| FOIA/PA-2012-0325 | |
| Download: ML14058A025 (11) | |
Text
1US.NRC
'-nn"ernai"-
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pmoicixi; ~peop ad dtr~i~
~ mmiI Oconee Flood Protection and the Jocassee Dam Hazard Commission Assistants brief August 12, 2008 10/3/2012
,,Official U nly -Sens' e mai m 'n 1
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
(iUS.NRC Prdm5 Ptoyk ad GdwFriromwa es\\In'trral Infor e
The oo cenario Rupture of Jocassee Dam I
- Lake Jocassee NioNlrnois toe
.385-ft Mee away Nine Times ark "
o Six Mile 1d Pickena C a l 10/3/2012 3
ýUOS.NRC fteain Pkpt. md the Earimmmi:
JOciae nly-aSe*ive Inem o
tiion Jo cwassee uam Aerial 1013/2012 4
~US.NRC
~MrD1TO"I AUrol f Wc'j Mr, I I ~ChIPepcAtirmnI 5
~US.NRC 0IDSTi~QI ftN WVCL OM SMUNLM Pr*cdwZPoap&
W dw £mvntrnume I Use lin\\ ensitie Thet talF nfoor arrier The SSF Flood Barriers If'
"'-'4" 10/3/2012 6
(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 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.
, Staff identified an under-estimate in licensee's dam failure frequency.
10/3/2012 fia y Sensiivq7 Inerna t
-~U.S.NRC (1WIU~VI Issuance 50.54() Letter 50.54 letter is best 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 Il Administrator to have joint call with Duke senior management when letter is issued.
Brief Commissioner Assistants prior to letter issuance.
10/312012 icial Us My -Se 'tive 8
Internal In rm on
I$yUSNRC PrcmPeopl aid 11w EavirmwNgt 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 $3 million in modifications. Modifications on the order of $13 million justified, 10/3/2012 9
~U.STINRU =%W%
'lEDti Eo l EthED.r.*
Actions Concurrent with 50.54() Letter (continued)
Generic issue preliminary assessment completed.
- Twenty five sites have a dependency 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 is sensitive.
Justification for continued interim operations of Oconee in progress.
10/3/2012 0 i Use y Sensiti e 10 Interna Inform ?io m
icial Use y -,ensiti*-
USRC al Inforom 10 cr~ng hople adAtA E~rn-miled 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 is issued.
- Evaluate licensee's response to letter.
, Determine if Safety Order is the appropriate regulatory vehicle.
10/3/2012 11