ML20197F605

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Advises That Facility Breakwater Structure Has Been Found Acceptable for Low Power Operation.M Fliegel 810729 Trip Rept Encl
ML20197F605
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 07/14/1981
From: Eisenhut D
Office of Nuclear Reactor Regulation
To: Harold Denton
Office of Nuclear Reactor Regulation
Shared Package
ML20197F583 List:
References
FOIA-86-679 NUDOCS 8108210276
Download: ML20197F605 (1)
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    • ..* JUL 14 1981 Docket tios. 50-275/323 fiote to H. R. Denton, tiRR ,

i In reference to your note of July 6,1981, the Diablo Canyon breakwater I structure has been found acceptable for low power operation as noted in Section 2.4 of Supplement tio.13. However, we also stated in Supplement fio.13 that this matter would be satisfactorily resolved prior to the ,

issuance of a full power license. Dr. Fliegel of our staff and our consultant Dr. Robert Sorenson of the Coastal Engineering Research Center conducted a June 17, 1981 site visit to (1) examine the breakwater structure and (2) to discuss the safety implications of the damaged breakwater and the proposed resolution. Dr. Fliegel stated in his trip report (copy attached) that the applicant and its consultant now have a better understanding of the type of information and analysis that mu'st be provided to the fiRC staff. The applicant is fully aware of our concerns about this matter being resolved prior to full power issuance and is l aggressively pursuing its resolution.

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- V _x Darrell G. Eisenhut, Director l

Division o icensing

Enclosure:

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't Docket tios. 50-275/323 MEM0RAf4DUM FOR: George lear, Chief Hydrologic and Geotechnical Engineering Branch Division of Engineering FROM: Myron Fliegel, leader Hydrologic Engineering Section Hydrologic and Geotechnical Engineering Branch.

Division of Engineering

SUBJECT:

STATUS OF EVALUATI0f4 0F DIABLO cat 4YOfl INTAKE STRUCTURE FLOODIf4G - BREAKWATER DAMAGE This status report is based upon information 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 f4RC and cannot, therefore, be considered as official.

Dr. Omar Lillevang, PG&E consultant, and his staff are studying the cause and effect of the damage to the breakwater. Physical model tests of the intake coves' response to high water and waves are scheduled to begin in mid-August. The first set of tests will be perfomed without the breakwater.

Maximum wind waves (which are limited by nearshore breaking) from various directions will be tested to determine the most severe with respect to the intake structure. Similar tests will be performed 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 can withstand the most severe of these conditions without loss of function or can be modified to do so. This will be dependent upon the maximem runup on the intake structure air vent stacks.

If the runup is less than the +30 feet mean lower low water (MLLW) level of the air intake, the applicant will argue that the breakwater is not needed for plant safety. If the runup is greater than +30 feet MLLW, the applicant will consider modifying the vent stacks to protect them to the appropriate level. The practicality of the latter course would depend upon the actual runup elevation determined. Analysis previously perfomed by the applicant indicated a maximum runup of over +44 feet MLLW during the combined tsunami - annual wave event for the no breakwater condition.

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Geor0e L. ear M 2 91931 Tests uill also be performed with the breab-:ater modeled to try to duplicate the actual stona danage. If the applicant concludes that the breab:ater is necessary to protect the intake, i.e., wave runun without the breakuater is too severe to be able to modify the intake to withstand, furtner 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 revieu that report and of the provide report.us with connents and quections within 5 wechs of his rcccipt Dependent upon the deficiencies in that repert ancther subnittal and review nay be required before we can close this issue. To that objective, it will be beneficial for Dr. Sorenson and the staff to visit the consultant during the testing progran to observe the nodel, and discuss progress, results, and staff concerns. ficam:hile, one staff site visit and occasional telephone contact have been our source of infon.ation on progress.

(.-icinal Signed by, r.yron H. Fliegel liyron Fliegel, i.eader flydrologic Engineering Section Hydrologic and Geotechnical Engineering Cranch Division of Engineering t

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