ML20197F580
| ML20197F580 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/29/1981 |
| From: | Fliegel M Office of Nuclear Reactor Regulation |
| To: | Lear G Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20197F583 | List: |
| References | |
| FOIA-86-679 NUDOCS 8108100503 | |
| Download: ML20197F580 (2) | |
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JUL i n 1981 1
Docket Nos. 50-275/323 fief!0RAf!DUti FOR: George Lear, Chief Ilydrologic and Geotechnical Engineering Branch,
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fWren Fliegel, Leader
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.9 Hydrologic and Geotechnical Engineering Branch Division of Engineering 77 g, o s
j SUGJECT:
STATUS OF EVALUATIOT: 0F DIACL0 CNiYO!! I!!TAKE STRUCTURE FLOODIf!G - BREAK'.fATER DNiAGE This status report is based upon infonnation obtained by our consultant, Dr. Sorenson of the Coastal Engineering Research Center (CERC).
It should be understood that the information has not been submitted to flRC and cannot, therefore, be considered as official.
Dr. Omar Lillevang, pGSE consultant, and his staff are studying the cause and effect of the danage to the breakwater.
Physical model tests of the intake coves' response to high water and waves are scheduled to begin in l
mid-August. The first set of tests will be perforned without the breakwater.
I flaximum wind waves (which are limited by nearshore breaking) from various directions will be tested to detemine the most severe with respect to the intake structure. Similar tests will be perforced for the condition of the maximum tsunami coincident with waves of annual severity.
It is our under-standing that the applicant hopes to either show that the intake structure l
can withstand the most severe of these conditions without loss of function l
or can be modified to do so. This will be dependent upon the maximum runup on the intake structure air vent stacks.
If the runup is less than the +30 feet mean loner low water (l LLU) level of the air intake, the applicant will argue that the breakwater is not I
needed for plant safety.
If the runup is greater than +30 feet !!LLW, the applicant will consider modifying the vent stacks to protect them to the appropriate level. The practicality of the latter course would depend opon
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the actual runup elevation detemined. Analysis previously performed by the I
applicant indicated a naximum runup of over +44 feet f LLU during the combined tsunami - annual wave event for the no breakwater condition.
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l George Lear JUL 2 91981 Tests will also be performed with the breakwater modeled to try to duplicate the actual storm damage.
If the applicant concludes that the breakwater is necessary to protect the intake, i.e., wave runup without the breakwater is too severe to be able to modify the intake to withstand, further testing will be needed.
In order for us to proceed with our evaluation the applicant will have to provide us with a report. Dr. Sorenson has agreed to review that report and provide us with coments and questions within 5 weeks of his receipt of the report. Dependent upon the deficiencies in that report another subnittal and review may be required before tJe can close this issue. To that objective, it will be beneficial for Dr. Sorenson and the staff to visit the consultant during the testing program to observe the model, and discuss progress, results, and staff concerns. !!eanwhile, one staff site visit and occasional telephone contact have been our source of information on progress.
9-iginal Signed by,
!.iyron 11. Fliegel.
liyron Fliegel, Leader Hydrologic Engineering Section Ilydrologic and Geotechnical Engineering Branch Division of Engineering d
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IAAR 18 1981 Docket Nos.:
2 MEMORANDUM FOR: The Atomic Safety and Licensing Board for the Diablo Canyon Nuclear Power Plant, Units 1 & 2 FROM:
Robert L. Tedesco, Assistant Director for Licensing, DL
SUBJECT:
BOARD NOTIFICATION - BREAKWATER DAMAGE, DIABLO CANYON, UNITS 1 & 2 (BH 81-04)
The staff was notified on the afternoon of January 29, 1981 of damage which had been incurred at the Diablo Canyon Nuclear Power Plant Breakw&ter.
Preliminary Notification of Unusual Occurrences November 81-04 identified damage to the west breakwater which comprised the loss of 80 to 100 feet of concrete caps and the " scattering" of the 26 to 36 ton tribars. Subsequent discussions with the Pacific Gas & Electric Company indicatedtthat approximately 120 feet of the structure was damaged.
Staff members will visit the site to inspect the damage and will further discuss this matter with the applicant and its consultant to detennine the safety implications of this incident. We will notify you of any further developments.
Odgla*
gned by Robert L. Tedesco, Assistant Director for Licensing Division of Licensing DISTRIBUTION:
Docket File 50-275/323
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BOARD NOTIFICATION DISTRIBUTION Docket File 50-275/323 LPDR PDR NSIC TERA LB#3 File-DEisenhut RPurple SVarga i
TIppolito RClark RReid BJYoungblood ASchwencer FMiraglia JRMiller DCrutchfield BRussell J01shinski BBuckley JLee RHVollmer TMurley Dross SHanauer BSnyder RHartfield, MPA OELD OI&E (3)
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BOARD NOTIFICATION DISTRIBUTION BREAKWATER DAMAGE, DIABLO CANYON, UNITS 1&2 (BN-81-04)
Atomic Safety and Licensing Appeal Board Atomic Safety and Licensing Board Panel Docketing and Service Section Mrs. Elizabeth Apfelberg Andrew Baldwin, Esq.
Richard E. Blankenburg Elizabeth S. Bowers, Esq.
Mr. Glenn 0. Bright Herbert H. Brown, Esq.
Dr. John H. Buck Philip A. Crane, Jr., Esq.
Mr. Frderick Eissler David S. Fleischaker, Esq.
Mrs. Raye Fleming Arthur C. Gehr, Esq.
Bryon S. Georgiou Mr. Richard B. Hubbard Dr. W. Reed Johnson Marion P. Johnston, Esq.
Janice E. Kerr, Esq.
Dr. Jerry Kline Mr. John Marrs Thomas S. Moore Marjorie S. Nordlinger Bruce Norton, Esq.
John R. Phillips, Esq.
Richard S. Salzman, Esq.
Mr. James 0. Schuyler Mr. Gordon Silver Mrs. Sandra A. Silver Harry M. Willis Mr. Roger Smith Mr. Myer Bender Dr. Max W. Carbon Mr. Jesse C. Ebersole Mr. Harold Etherington Dr. William Kerr
.Dr. Stephen Lawroski Dr. Harold W. Lewis Dr. J. Carson Mark Mr. William M. Mathis Dr. Dade W. Moeller Dr. David Okrent Dr. Milton S..Plesset Mr. Jeremiah J. Ray Dr. Paul G. Shewmon Dr. Chester P. Siess
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