ML20082P935
| ML20082P935 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/06/1991 |
| From: | Cottle W ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9109110157 | |
| Download: ML20082P935 (2) | |
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September 6, 1991 U.S. Nuclear Regulatory Commission Mail Station Pl-137 Washington, D.C.
20555 Attention: Document Control Desk
SUBJECT:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Groundwater Level Exceeds 109.0' MSL in Monitcring Well 6 GNR0-91/00138 Gentlemen:
Groundwater level readings taken at Monitoring Well 6 (MW-6) froire May 7, 1991 to May 20, 1991 indicated levels in excess of 109.0 feet mean sea level (MSL). - MW-6 is adjacent to the_ Auxiliary Building south wall midway _
between dewatering wells 6 and 7.
The maximum level recorded for MW-6 during this period was 109.32 feet MSL on May 14, 1991. This occurrence of high groundwater: level is being reported as requested by your letter
. dated. August 19,.1985-(MAEC-85/0284).
L An engineering stt:dy.erformed in 1985 concluded that grour.dwater levels up_ to 114.5 feet MS: would not impair the structural integrity of Unit 1 buildings as.previously submitted by letter riated February _14,1985-
-(AECH-85/0035),
p Rainfall;during'the: period May 7 - 20, 1991 totalled 2.7 inches. Rainfall
'during the thirty (30) days prior to:this period totalled 18.6. inches, with 6.6 inches of. rain in the last nine (9) days prior to May 7th.
The groundwater level at. MW-6 subsided to 108.9 as recorded on May 23, 1991.
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September 6. 1991 GNR0-91/00138 Page 2 of 3 A groundwater program is presently evaluating issues associated with high groundwater levels. Groundwater level readings had been taken on an increased frequency to provide data for the groundwater program.
The elevated groundwater level was detected when the data was compiled for file retention.
No elevated groundwater level at MW-6 was observed as part of the monthly groundwater level inspections. A final report of the groundwater program is scheduled for issuance by April 30, 1992.
Yours truly, upr"C m WTC/BAB/cg cc:
Mr. D. C. Hintz Mr. J. L. Mathis Mr. R. B. McGehee Mr. N. S. Reynolds Mr. H. L. Thomas Mr. F. W. Titus Mr. Stewart D. Ebneter l
Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 l
Mr. L. L. Kintner, Project Manager Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 11021 Washington, D.C.
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