ML19344E343

Submits Info Informing NRC of Unexpected Potentially Harmful Sedimentation Effects & Current Actions to Immediately Reduce & Ultimately Eliminate Problem.Drawing Encl

ML19344E343
Person / Time
Site:	Vogtle
Issue date:	08/22/1980
From:	Kelly R GEORGIA POWER CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
NUDOCS 8008280421
Download: ML19344E343 (3)

Text

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2: , e,.e,n August 22, 1980 Director of Nuclear Regulation Attention: Darrell C. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC Docket Numbers 50-424 and 50-425 Construction Permit Numbers CPPR-108 and CPPR-109 Vogtle Electric Generating Plant Sedimentation Effects Gentlemen:

7. accordance with the Vogtle Construction Permit Georgia Power Company hereby notifies the Nuclear Regulatory Commission of an unexpected potentially harmful environmental effect and the company's current action to immediately reduce the effect and to ultimately eliminate it.

Prior to Georgia Power Company's aquisition of the Vogtle site, the previous land owner had created a small pond in the northeast

( sector of what is now the site, by the construction of a dike (see l

attached figure). When construction of Vogtle began, this pond, as well as several other ponds constructed by Georgia Power Company, was used to provide settling of solids contained in rainfall runoff.

l In mid-November 1979 the dike failed during a large rainfall.

Solids were washed approximately 100 yards below the dike towards

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the Savannah River. Within a short time aftar the break the runoff l that was flowing through the exposed pond bottom created a narrow channel which minimized the amount of solids being carried from the old pond. The impact of the failure was considered short term and insignificant. 3 V C.

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S0082 80431

i GeorgiaPower A Director of Nuclear Regulation August 22, 1980

-Page 2 During the last several rainfalls, the water has no longer been confined to the self-induced channel but has spread throughout the area of the pond bottom. With a greater source of accessible solids, more solids are being washed downstream and into the river with each ta'ar rainfall. The problem no longer appears to be a one time problem or merely short term, but rather one that would have potential impact and needs correction as reported by our Mr. E. D. Groover to Mr. Cunningham on August 4, 1980.

The area below the old dike, the dike itself and a portion of the pond are in a location where the plant discharge and dilution lines will be placed. When these lines are installed much of the deposited sediment will be removed. Our current construction timetable shows that installation of these lines are scheduled for mid-1982. Hr7ever, recogrizing the need to address the sedimentation problem at an earlier date, we are expediting engineering, construction and permitting functions relevant to installation  !

of the lines as well as permanent sediment control.

We feel that the most expedient method for correcting the sedimentation problem is to perform all work in this area at the same time. If we rebuild the dike now, it would have to be removed in a short time to allow installation of the lines. Such an effort would be counterproductive and would result in additional impacts due to construction activity. We are making all efforts during the interim to minimize the supply of solids to the exposed pond bottom, and reduce the loss of solids by utilizing haybales, filter fences, rip-rap and other mitigating measures. We are expediting application to the U.S. Corps of Engineers for a permit to do work in the waters of the United States to allow construction of the discharge and dilution lines and undertaking of a permanent cure of the sedimentation problem.

Sincerely, wm a R. J. K . -

CDM/bim Attachment cc: W. L. Westbrook R. A. Thomas J. A. Bailey A. L. Cunningham J. G. Farley, Jr.

D. E. Dutton G. F. Trowbridge T. E. Byerley B. L. Lex K.-M. Gillespie

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