ML20134K452

Forwards Geotechnical Verification Work Rept of Results, Addressing SER Confirmatory Item 5 Re Groundwater Monitoring & Confirmatory Item 8 on Clay Marl Stratum

ML20134K452
Person / Time
Site:	Vogtle
Issue date:	08/23/1985
From:	Bailey J GEORGIA POWER CO.
To:	Adensam E Office of Nuclear Reactor Regulation
Shared Package
ML20134K455	List: ML20134K452 ML20134K474
References
0112V, 112V, GN-695, NUDOCS 8508300223
Download: ML20134K452 (2)

Text

F~ l Georgia Power Computy

~"

Rout 3 2. Box 299A Wcynssboro, Georgia 30830 #

Telephone 404 554-9961 404 724-8114 Southern Company Services,Inc.

Post Office Box 2625 Birmingham. Alabama 35202 Telephone 205 8704011 Vogtle Proj.e ct August 23, 1985 Director of Nuclear Reactor Regulation File: X7BC35 Attention: Ms. Elinor G. Adensam, Chief Log: GN-695 Licensing Branch #4 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 V0GTLE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 SER CONFIRMATORY ITEM 5: GROUNDWATER MONITORING SER CONFIRMATORY IIEM 8: CLAY MARL STRATUM

Dear Mr. Denton:

Enclosed for your staff's review is a copy of "Geotechnical Verification Work ,

- Report of Results." This document was prepared to report our findings from 8 the recently completed field and laboratory studies. In summary, these studies have verified previous findings on site characteristics:

e The core holes in the Blue Bluff marl have confirmed that the marl is a competent, firm, preconsolidated stratum, without voids or secondary openings.

e The permeability tests, both in situ and laboratory, verify that the marl is nearly impermeable.

e Additional observation wells, installed as part of this study, will allow acquisition of the data required by the "Cround Water Monitoring Program" submitted in June 1985.

e Preliminary water levels measured in these wells are consistent with previous results, e The laboratory studies on cation exchange capacity and distribution coefficients for the backfill, have shown the previous assumptions for the accidental spill analysis to be conservative.

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Director of Nuclear Regulatory Regulation File: X7BC35

. August 23, 1985 Log: GN-695 l

Page 2-This report should allow closure of confirmatory items listed in Sections 2.4 and 2.5 of the SER.

e Section 2.4.12.6 - Design Basis for Subsurface Hydrostatic Loading The additional wells installed in the water table aquifer during this study will provide the required data for the monitoring program.

e Section 2.4.12.7 - Ground Water Monitoring Program The program previously submitted to the staff has been implemented.

Georgia Power Company is recording water levels in each aquifer on the

<- schedule discussed in the program. The results, along with the site specific rainfall data, are being submitted to Bechtel geohydrologists for tabulation, technical review, and data management. This review-includes a determination between the relationship of ground water levels to precipitation.

The data will be submitted to NRC for review after the first six month reporting period at the end of 1985, without reduction in the monitoring frequency.

e Section 2.5.4.5 - Instrumentation and Monitoring This rcesrt provides the data on the six wells installed in the mari, the results of the in situ permeability testing, and detailed geologic logs of the core holes. NRC staff reviewers from hydrology and soils engineering visited the site to inspect marl core and well construction.

If your staff requires any additional information, please do not hesitate to contact me.

Sincerel , ,

k. k.

J. A. Bailey Project' Licensing Manager JAB /sm Enclosure xc: D. O. Foster G. Bockhold, Jr.

R. A. Thomas T. Johnson (w/o enclosure)

J. E. Joiner, Esquire D. C. Teper (w/o enclosure)

B. W. Churchill, Esquire L. Fowler M. A. Miller W. C. Ramsey l B. Jones (w/o enclosure) Vogtle' Project File

! L. T. Gucwa l

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