ML19211C809
| ML19211C809 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 11/26/1979 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Scott S NRC OFFICE OF ADMINISTRATION (ADM) |
| Shared Package | |
| ML19211C810 | List: |
| References | |
| TASK-02-04, TASK-2-4, TASK-RR NUDOCS 8001150014 | |
| Download: ML19211C809 (4) | |
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8 UNITED STATES
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..c Please fonvard the enclosed material to the Lacrosse Board.
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D. G. Eisennut, Acting Direc:cr Division of Operating Reactors
Enclosures:
1.
Evaluatico of Attacnec Material 2.
10/25/79 ero 3.
10/19/79 Letter J.
Da'res 3." core 'nc. Report
- w/enci 1 & 2:
- 5. '/arga E. Cnristenbury J. Shea L. Nicncis
/
1765 173 8001150Ol4
DISTRIBUTION OF BOARD NOTIFICATION LA CROSSE Atcaic Safety and Licensing Aapeal Scard Atomic Safety and Licensing Boarc Panel Cocketing and Service Section Dr. George C. Anderson Charles Bechhoefer, Esq., Chairman Mr. Ralph S. Decker Michael C. Farrar, Esq.
O. S. Hies tand, Esq.
Dr. W. Reed Jonnson Frank Linder, Gen. Manager George R. Nygaard Robert H. Swen, Jr., Esq.
Ala.. S.1csenthal, Esq., Chairman Fri t: Schubert, Esq.
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EVALUATION OF ATTACHED MATERIAL Suoject: Liquefaction Potential at tne Lacrosse Site Attachments:
1.
Pemorandum frc.a P.. Jackscn to D. Crutchfield October 25, 1979 2.
Letter frcm F. Brown to J. Knignt Oct:ter 19, 1979 3.
- ames ana Mcore F.ecort 7he staf# nas nct ccmoie:ec its rev'ew of the licensee's ix.estigation of the liquefaction potential at tne LAC 3WR site.
The results of the investigation to date by the licensee are contained in the attacned report precared by :ames and Moore, Inc. for Dairyland Pcwer Cccoerative. Based cn the review to date, the staff concludes that:
1.
If sustained strong grcund motion occurs with eak accelerations of 0.12 g or higher, liquefac; ion can occur dcwn to a deotn of acout 20 feet.
2.
Basec on evaluations to date, there is a relatively low seismic hazard at this site because of the earthquake history.
3.
There is icw seismic hazard for the facility during the period required to complete the staff's evaluation of the SEP seismic methodology and to establish the seismic design bases for Lacrosse.
.1 Cn October 17, 1979, and November 2,1979, the staff met with Cairyland Pcwer Cooperative (CPC) and their consultants to discuss the liquefaction issue at the LAC 3WR site. DPC and their consultants, Dames and Moore, made a presentaticn in support of their conclusien that no liquefacticn would cccur for an SSE less than 0.18g. The staff and its consultant, the Corps of Engineers, concluded that liquefaction could occur at the site for an SSE of 0.12g.
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_2-The staff infonned DPC that they would have to take positive steps to resolve this concern (by dewatering or other methods).
OPC agreed to submit their proposed program to address this concern by lovember 20, 1979. The staff believes that the seismic hazard at the site is icw enough to cerlit continued
- ceration wnile tne staff and licensee resolve the questions relatec to the aporocriate seismic design basis and tne accroariate remedial action to reduce the potential for liquefacticn.
The staff believes that this information is relevent to the ongoing Lacrosse FTL review. This raterial is submitted for infor aticn Ourcoses to tne Board.
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