ML20210U854

Special Rept:On 970623,groundwater Level at Piezometer P-22 Was Noted to Be Above Maximum Water Level by 0.31 Feet. Addl Standpipe Piezometers Will Be Installed at Toe of Slope of Dike Along Southeast Section to Provide Further Info

ML20210U854
Person / Time
Site:	North Anna
Issue date:	09/16/1997
From:	Kansler M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
97-376, NUDOCS 9709220098
Download: ML20210U854 (2)

Text

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\'IRGINI A Ei.i:cTRIC ANil POWl:H CONIPANY Ricmuisin, Visuaisi A 2326:

L t September 16, 1997 United States Nuclear Regulatory Commission Serial No.97-376 Attention: Document Control Desk MPW/ETS Washington, D.C. 20555 Docket Nos. 50-338,339 License Nos. NPF-4,7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NJRTH ANNA POWER STATION UNITS 1 AND 2 SF.RVICE WATER GROUND WATER SPECIAL REPORT North Anna Technical Specifications Section 6.9.2 requires a Special Report be submitted when groundwater levels specified for the service water reservoir have exceeded the current maximum water level. Special Reports, Serial Numbers96-561, l 96-561A, and 97-284 were previously submittod on December 10, 1996, February 4, 1997,and May 13,1997, respectively, to document piezometer P-22 exceeding the maximum water level. On June 23,1997, the groundwater level at piezometer P-22 l was again noted to be above the maximum water level by 0.31 feet.

As indicated in the previous reports, an engineering evaluation was performed to determine the cause of the high ground water and the influence on the stability of the service water reservoir dike. The increased water level does not indicate a significan.t tduction of the stability of the service water reservoir dike. We are continuing with the action plan outlined previously. The piezometers along the southeast portion of the dike are being monitored on an increased frequency (quarterly basis) for a year to better determine any trend in the water levels. Additional standpipe piezometers will be installed at the toe of the sicpe of the dike along the southeast section to provide further information relative to groundwater conditions in the area of the two existing piezometers (P-21 and P-22).

No new commitments are made as the result of this special report. This report has been reviewed by the Station Nuclear Safety and Operating Committee. Should you have any questions regarding this report, please contact us.

Very truly yours, Vic nster resident - Nuclear Operations

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i cc: U. S. Nuclear Regulatory Commission

. , Region ll l ' , , Atlanta Federal Center

61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 i

Mr. M. J. Morgan _ _

NRC Senior Resident Inspector

North Anna Power Station i

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