ML20141E765

Special Rept:On 970430,groundwater Level at Piezometer P-22 Again Noted to Be Above Max Water Level by 0.86 Feet. Piezometers Along Southeast Portion of Dike Being Monitored on Increased Frequency for Yr to Determine Water Levels

ML20141E765
Person / Time
Site:	North Anna
Issue date:	05/13/1997
From:	Kansler M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
97-284, NUDOCS 9705210105
Download: ML20141E765 (2)

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, . Visu;isir Ei.ECTHIC ANI) POW ER CmWA N Y Ricism >Ns). VIRGINI A 2M61 May 13, 1997 United States Nuclear Regulatory Commission Serial No.97-284 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 CQNIPANY >

NORTH ANNA POWER STATION UNITS 1 AND 2 SERVICE WATER GROUND WATE_B 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 and 96-561 A, were previously submitted on December 10,1996 and February 4,1997, respectively, to document piezometer P-22 exceeding the maximurn water level. On April 30,1997, the groundwater level at piezometer F-22 was again noted to be above the maximum water level by 0.86 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 significant reduction 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 slope 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).

1 This report has been reviewed by the Station Nuclear Safety and Operating Committee.

No new commitments are made as the result of this letter. Should you have any questions regarding this report, please contact us.

Very truly yours, p

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cc: U. S. Nuclear Regulatory Commission

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Region ll l Atlanta Federal Center -

61 Forsyth St., SW, Suite 23T85 ,

Atlanta, Georgia 30303 NRC Senior Resident inspector North Anna Power Station 1

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